update registry url, and cart url

Co-authored-by: matst80 <mats.tornberg@gmail.com>
Reviewed-on: https://git.tornberg.me/mats/go-cart-actor/pulls/6
Co-authored-by: Mats Törnberg <mats@tornberg.me>
Co-committed-by: Mats Törnberg <mats@tornberg.me>

.gitea/workflows/build.yaml

@@ -3,75 +3,41 @@ run-name: ${{ gitea.actor }} build 🚀
 on: [push]
 
 jobs:
-  Metadata:
-    runs-on: arm64
-    outputs:
-      version: ${{ steps.meta.outputs.version }}
-      git_commit: ${{ steps.meta.outputs.git_commit }}
-      build_date: ${{ steps.meta.outputs.build_date }}
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-      - id: meta
-        name: Derive build metadata
-        run: |
-          GIT_COMMIT=$(git rev-parse HEAD)
-          if git describe --tags --exact-match >/dev/null 2>&1; then
-            VERSION=$(git describe --tags --exact-match)
-          else
-            VERSION=$(git rev-parse --short=12 HEAD)
-          fi
-          BUILD_DATE=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
-          echo "git_commit=$GIT_COMMIT" >> $GITHUB_OUTPUT
-          echo "version=$VERSION" >> $GITHUB_OUTPUT
-          echo "build_date=$BUILD_DATE" >> $GITHUB_OUTPUT
-
   BuildAndDeployAmd64:
-    needs: Metadata
     runs-on: amd64
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Build amd64 image
         run: |
           docker build \
-            --build-arg VERSION=${{ needs.Metadata.outputs.version }} \
-            --build-arg GIT_COMMIT=${{ needs.Metadata.outputs.git_commit }} \
-            --build-arg BUILD_DATE=${{ needs.Metadata.outputs.build_date }} \
             --progress=plain \
-            -t registry.knatofs.se/go-cart-actor-amd64:latest \
-            -t registry.knatofs.se/go-cart-actor-amd64:${{ needs.Metadata.outputs.version }} \
+            -t registry.k6n.net/go-cart-actor-amd64:latest \
             .
       - name: Push amd64 images
         run: |
-          docker push registry.knatofs.se/go-cart-actor-amd64:latest
-          docker push registry.knatofs.se/go-cart-actor-amd64:${{ needs.Metadata.outputs.version }}
+          docker push registry.k6n.net/go-cart-actor-amd64:latest
       - name: Apply deployment manifests
         run: kubectl apply -f deployment/deployment.yaml -n cart
-      - name: Rollout amd64 deployment (pin to version)
+      - name: Rollout amd64 backoffice deployment
         run: |
-          kubectl set image deployment/cart-actor-x86 -n cart cart-actor-amd64=registry.knatofs.se/go-cart-actor-amd64:${{ needs.Metadata.outputs.version }}
-          kubectl rollout status deployment/cart-actor-x86 -n cart
+          kubectl rollout restart deployment/cart-backoffice-x86 -n cart
+          kubectl rollout restart deployment/cart-actor-x86 -n cart
 
   BuildAndDeployArm64:
-    needs: Metadata
     runs-on: arm64
     steps:
       - uses: actions/checkout@v4
       - name: Build arm64 image
         run: |
           docker build \
-            --build-arg VERSION=${{ needs.Metadata.outputs.version }} \
-            --build-arg GIT_COMMIT=${{ needs.Metadata.outputs.git_commit }} \
-            --build-arg BUILD_DATE=${{ needs.Metadata.outputs.build_date }} \
             --progress=plain \
-            -t registry.knatofs.se/go-cart-actor:latest \
-            -t registry.knatofs.se/go-cart-actor:${{ needs.Metadata.outputs.version }} \
+            -t registry.k6n.net/go-cart-actor:latest \
             .
       - name: Push arm64 images
         run: |
-          docker push registry.knatofs.se/go-cart-actor:latest
-          docker push registry.knatofs.se/go-cart-actor:${{ needs.Metadata.outputs.version }}
+          docker push registry.k6n.net/go-cart-actor:latest
       - name: Rollout arm64 deployment (pin to version)
         run: |
-          kubectl set image deployment/cart-actor-arm64 -n cart cart-actor-arm64=registry.knatofs.se/go-cart-actor:${{ needs.Metadata.outputs.version }}
           kubectl rollout status deployment/cart-actor-arm64 -n cart
+      #     kubectl set image deployment/cart-actor-arm64 -n cart cart-actor-arm64=registry.k6n.net/go-cart-actor:${{ needs.Metadata.outputs.version }}
+      #     # kubectl rollout status deployment/cart-actor-arm64 -n cart

.gitignore

@@ -1,4 +1,5 @@
 __debug*
 go-cart-actor
 data/*.prot
-data/*.go*
+data/*.go*
+data/se/*

Dockerfile

@@ -59,6 +59,20 @@ RUN --mount=type=cache,target=/go/build-cache \
     -X main.BuildDate=${BUILD_DATE}" \
     -o /out/go-cart-actor ./cmd/cart
 
+RUN --mount=type=cache,target=/go/build-cache \
+    go build -trimpath -ldflags="-s -w \
+    -X main.Version=${VERSION} \
+    -X main.GitCommit=${GIT_COMMIT} \
+    -X main.BuildDate=${BUILD_DATE}" \
+    -o /out/go-cart-backoffice ./cmd/backoffice
+
+RUN --mount=type=cache,target=/go/build-cache \
+    go build -trimpath -ldflags="-s -w \
+    -X main.Version=${VERSION} \
+    -X main.GitCommit=${GIT_COMMIT} \
+    -X main.BuildDate=${BUILD_DATE}" \
+    -o /out/go-cart-inventory ./cmd/inventory
+
 ############################
 # Runtime Stage
 ############################
@@ -67,6 +81,8 @@ FROM gcr.io/distroless/static-debian12:nonroot AS runtime
 WORKDIR /
 
 COPY --from=build /out/go-cart-actor /go-cart-actor
+COPY --from=build /out/go-cart-backoffice /go-cart-backoffice
+COPY --from=build /out/go-cart-inventory /go-cart-inventory
 
 # Document (not expose forcibly) typical ports: 8080 (HTTP), 1337 (gRPC)
 EXPOSE 8080 1337

README.md

@@ -1,36 +1,5 @@
 # Go Cart Actor
 
-## Migration Notes (Ring-based Ownership Transition)
-
-This release removes the legacy ConfirmOwner ownership negotiation RPC in favor of deterministic ownership via the consistent hashing ring.
-
-Summary of changes:
-- ConfirmOwner RPC removed from the ControlPlane service.
-- OwnerChangeRequest message removed (was only used by ConfirmOwner).
-- OwnerChangeAck retained solely as the response type for the Closing RPC.
-- SyncedPool now relies exclusively on the ring for ownership (no quorum negotiation).
-- Remote proxy creation includes a bounded readiness retry to reduce first-call failures.
-- New Prometheus ring metrics: 
-  - cart_ring_epoch
-  - cart_ring_hosts
-  - cart_ring_vnodes
-  - cart_ring_host_share{host}
-  - cart_ring_lookup_local_total
-  - cart_ring_lookup_remote_total
-
-Action required for consumers:
-1. Regenerate protobuf code after pulling (requires protoc-gen-go and protoc-gen-go-grpc installed).
-2. Remove any client code or automation invoking ConfirmOwner (calls will now return UNIMPLEMENTED if using stale generated stubs).
-3. Update monitoring/alerts that referenced ConfirmOwner or ownership quorum failures—use ring metrics instead.
-4. If you previously interpreted “ownership flapping” via ConfirmOwner logs, now check for:
-   - Rapid changes in ring epoch (cart_ring_epoch)
-   - Host churn (cart_ring_hosts)
-   - Imbalance in vnode distribution (cart_ring_host_share)
-
-No data migration is necessary; cart IDs and grain state are unaffected.
-
----
-
 A distributed cart management system using the actor model pattern.
 
 ## Prerequisites

cmd/backoffice/fileserver.go

@@ -0,0 +1,280 @@
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"net/http"
+	"os"
+	"path/filepath"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	"git.tornberg.me/go-cart-actor/pkg/actor"
+	"git.tornberg.me/go-cart-actor/pkg/cart"
+)
+
+type FileServer struct {
+	// Define fields here
+	dataDir string
+	storage actor.LogStorage[cart.CartGrain]
+}
+
+func NewFileServer(dataDir string, storage actor.LogStorage[cart.CartGrain]) *FileServer {
+	return &FileServer{
+		dataDir: dataDir,
+		storage: storage,
+	}
+}
+
+func isValidId(id string) (uint64, bool) {
+	if nr, err := strconv.ParseUint(id, 10, 64); err == nil {
+		return nr, true
+	}
+	if nr, ok := cart.ParseCartId(id); ok {
+		return uint64(nr), true
+	}
+	return 0, false
+}
+
+func isValidFileId(name string) (uint64, bool) {
+
+	parts := strings.Split(name, ".")
+	if len(parts) > 1 && parts[1] == "events" {
+		idStr := parts[0]
+
+		return isValidId(idStr)
+	}
+	return 0, false
+}
+
+// func AccessTime(info os.FileInfo) (time.Time, bool) {
+// 	switch stat := info.Sys().(type) {
+// 	case *syscall.Stat_t:
+// 		// Linux: Atim; macOS/BSD: Atimespec
+// 		// Use reflection or build tags if naming differs.
+// 		// Linux:
+// 		if stat.Atim.Sec != 0 || stat.Atim.Nsec != 0 {
+// 			return time.Unix(int64(stat.Atim.Sec), int64(stat.Atim.Nsec)), true
+// 		}
+// 		// macOS/BSD example (uncomment if needed):
+// 		//return time.Unix(int64(stat.Atimespec.Sec), int64(stat.Atimespec.Nsec)), true
+// 	}
+// 	return time.Time{}, false
+// }
+
+func appendFileInfo(info fs.FileInfo, out *CartFileInfo) *CartFileInfo {
+	//sys := info.Sys()
+	//fmt.Printf("sys type %T", sys)
+	out.Size = info.Size()
+	out.Modified = info.ModTime()
+	//out.Accessed, _ = AccessTime(info)
+	return out
+}
+
+// var cartFileRe = regexp.MustCompile(`^(\d+)\.events\.log$`)
+
+func listCartFiles(dir string) ([]*CartFileInfo, error) {
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return []*CartFileInfo{}, nil
+		}
+		return nil, err
+	}
+	out := make([]*CartFileInfo, 0)
+	for _, e := range entries {
+		if e.IsDir() {
+			continue
+		}
+		id, valid := isValidFileId(e.Name())
+		if !valid {
+			continue
+		}
+
+		info, err := e.Info()
+		if err != nil {
+			continue
+		}
+		info.Sys()
+		out = append(out, appendFileInfo(info, &CartFileInfo{
+			ID:     fmt.Sprintf("%d", id),
+			CartId: cart.CartId(id),
+		}))
+	}
+	return out, nil
+}
+
+func readRawLogLines(path string) ([]json.RawMessage, error) {
+	fh, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer fh.Close()
+	lines := make([]json.RawMessage, 0, 64)
+	s := bufio.NewScanner(fh)
+	// increase buffer to handle larger JSON lines
+	buf := make([]byte, 0, 1024*1024)
+	s.Buffer(buf, 1024*1024)
+	for s.Scan() {
+		line := s.Bytes()
+		if line == nil {
+			continue
+		}
+		lines = append(lines, line)
+	}
+	if err := s.Err(); err != nil {
+		return nil, err
+	}
+	return lines, nil
+}
+
+func writeJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.Header().Set("Cache-Control", "no-cache")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(v)
+}
+
+func (fs *FileServer) CartsHandler(w http.ResponseWriter, r *http.Request) {
+	list, err := listCartFiles(fs.dataDir)
+	if err != nil {
+		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
+		return
+	}
+	// sort by modified desc
+	sort.Slice(list, func(i, j int) bool { return list[i].Modified.After(list[j].Modified) })
+
+	writeJSON(w, http.StatusOK, map[string]any{
+		"count": len(list),
+		"carts": list,
+	})
+}
+
+func (fs *FileServer) PromotionsHandler(w http.ResponseWriter, r *http.Request) {
+	fileName := filepath.Join(fs.dataDir, "promotions.json")
+	if r.Method == http.MethodGet {
+		file, err := os.Open(fileName)
+		if err != nil {
+			writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
+			return
+		}
+		defer file.Close()
+
+		io.Copy(w, file)
+		return
+	}
+	if r.Method == http.MethodPost {
+		file, err := os.Create(fileName)
+		if err != nil {
+			writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
+			return
+		}
+		defer file.Close()
+
+		io.Copy(file, r.Body)
+		return
+	}
+
+	w.WriteHeader(http.StatusMethodNotAllowed)
+}
+
+func (fs *FileServer) VoucherHandler(w http.ResponseWriter, r *http.Request) {
+	fileName := filepath.Join(fs.dataDir, "vouchers.json")
+	if r.Method == http.MethodGet {
+		file, err := os.Open(fileName)
+		if err != nil {
+			writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
+			return
+		}
+		defer file.Close()
+
+		io.Copy(w, file)
+		return
+	}
+	if r.Method == http.MethodPost {
+		file, err := os.Create(fileName)
+		if err != nil {
+			writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
+			return
+		}
+		defer file.Close()
+
+		io.Copy(file, r.Body)
+		return
+	}
+
+	w.WriteHeader(http.StatusMethodNotAllowed)
+}
+
+func (fs *FileServer) PromotionPartHandler(w http.ResponseWriter, r *http.Request) {
+	idStr := r.PathValue("id")
+	if idStr == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		fmt.Fprintf(w, "missing id")
+		return
+	}
+	_, ok := isValidId(idStr)
+	if !ok {
+		w.WriteHeader(http.StatusBadRequest)
+		fmt.Fprintf(w, "invalid id %s", idStr)
+		return
+	}
+	w.WriteHeader(http.StatusNotImplemented)
+}
+
+type JsonError struct {
+	Error string `json:"error"`
+}
+
+func (fs *FileServer) CartHandler(w http.ResponseWriter, r *http.Request) {
+	idStr := r.PathValue("id")
+	if idStr == "" {
+		writeJSON(w, http.StatusBadRequest, JsonError{Error: "missing id"})
+		return
+	}
+	id, ok := isValidId(idStr)
+	if !ok {
+		writeJSON(w, http.StatusBadRequest, JsonError{Error: "invalid id"})
+		return
+	}
+	// reconstruct state from event log if present
+	grain := cart.NewCartGrain(id, time.Now())
+
+	err := fs.storage.LoadEvents(r.Context(), id, grain)
+	if err != nil {
+		writeJSON(w, http.StatusInternalServerError, JsonError{Error: err.Error()})
+		return
+	}
+
+	path := filepath.Join(fs.dataDir, fmt.Sprintf("%d.events.log", id))
+	info, err := os.Stat(path)
+	if err != nil && errors.Is(err, os.ErrNotExist) {
+		writeJSON(w, http.StatusNotFound, JsonError{Error: "cart not found"})
+		return
+	} else if err != nil {
+		writeJSON(w, http.StatusInternalServerError, JsonError{Error: err.Error()})
+		return
+	}
+	lines, err := readRawLogLines(path)
+	if err != nil {
+		writeJSON(w, http.StatusInternalServerError, JsonError{Error: err.Error()})
+		return
+	}
+	writeJSON(w, http.StatusOK, map[string]any{
+		"id":        id,
+		"cartId":    cart.CartId(id).String(),
+		"state":     grain,
+		"mutations": lines,
+		"meta": map[string]any{
+			"size":     info.Size(),
+			"modified": info.ModTime(),
+			"path":     path,
+		},
+	})
+}

cmd/backoffice/fileserver_test.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"math/rand"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"git.tornberg.me/go-cart-actor/pkg/cart"
+)
+
+// TestAppendFileInfoRandomProjectFile picks a random existing .go source file in the
+// repository (from a small curated list to keep the test hermetic) and verifies
+// that appendFileInfo populates Size, Modified and System without mutating the
+// identity fields (ID, CartId). The randomness is only to satisfy the requirement
+// of using "a random project file"; the test behavior is deterministic enough for
+// CI because all chosen files are expected to exist.
+func TestAppendFileInfoRandomProjectFile(t *testing.T) {
+	candidates := []string{
+		filepath.FromSlash("../../pkg/cart/cart_id.go"),
+		filepath.FromSlash("../../pkg/actor/grain.go"),
+		filepath.FromSlash("../../cmd/cart/main.go"),
+	}
+	// Pick one at random.
+	rand.Seed(time.Now().UnixNano())
+	path := candidates[rand.Intn(len(candidates))]
+
+	info, err := os.Stat(path)
+	if err != nil {
+		t.Fatalf("stat failed for %s: %v", path, err)
+	}
+
+	// Pre-populate a CartFileInfo with identity fields.
+	origID := "test-id"
+	origCartId := cart.CartId(12345)
+	cf := &CartFileInfo{ID: origID, CartId: origCartId}
+
+	// Call function under test.
+	got := appendFileInfo(info, cf)
+
+	if got != cf {
+		t.Fatalf("appendFileInfo should return the same pointer instance")
+	}
+
+	if cf.ID != origID {
+		t.Fatalf("ID mutated: expected %q got %q", origID, cf.ID)
+	}
+	if cf.CartId != origCartId {
+		t.Fatalf("CartId mutated: expected %v got %v", origCartId, cf.CartId)
+	}
+
+	if cf.Size != info.Size() {
+		t.Fatalf("Size mismatch: expected %d got %d", info.Size(), cf.Size)
+	}
+
+	mod := info.ModTime()
+	// Allow small clock skew / coarse timestamp truncation.
+	if cf.Modified.Before(mod.Add(-2*time.Second)) || cf.Modified.After(mod.Add(2*time.Second)) {
+		t.Fatalf("Modified not within expected range: want ~%v got %v", mod, cf.Modified)
+	}
+
+}
+
+// TestAppendFileInfoTempFile creates a temporary file to ensure Size and Modified
+// are updated for a freshly written file with known content length.
+func TestAppendFileInfoTempFile(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "temp.events.log")
+	content := []byte("hello world\nanother line\n")
+	if err := os.WriteFile(path, content, 0644); err != nil {
+		t.Fatalf("write temp file failed: %v", err)
+	}
+
+	info, err := os.Stat(path)
+	if err != nil {
+		t.Fatalf("stat temp file failed: %v", err)
+	}
+
+	cf := &CartFileInfo{ID: "temp", CartId: cart.CartId(0)}
+	appendFileInfo(info, cf)
+
+	if cf.Size != int64(len(content)) {
+		t.Fatalf("expected Size %d got %d", len(content), cf.Size)
+	}
+	if cf.Modified.IsZero() {
+		t.Fatalf("Modified should be set")
+	}
+}

cmd/backoffice/hub.go

@@ -0,0 +1,248 @@
+package main
+
+import (
+	"bufio"
+	"crypto/sha1"
+	"encoding/base64"
+	"encoding/binary"
+	"io"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+)
+
+// Hub manages websocket clients and broadcasts messages to them.
+type Hub struct {
+	register   chan *Client
+	unregister chan *Client
+	broadcast  chan []byte
+	clients    map[*Client]bool
+}
+
+// Client represents a single websocket client connection.
+type Client struct {
+	hub  *Hub
+	conn net.Conn
+	send chan []byte
+}
+
+// NewHub constructs a new Hub instance.
+func NewHub() *Hub {
+	return &Hub{
+		register:   make(chan *Client),
+		unregister: make(chan *Client),
+		broadcast:  make(chan []byte, 1024),
+		clients:    make(map[*Client]bool),
+	}
+}
+
+// Run starts the hub event loop.
+func (h *Hub) Run() {
+	for {
+		select {
+		case c := <-h.register:
+			h.clients[c] = true
+		case c := <-h.unregister:
+			if _, ok := h.clients[c]; ok {
+				delete(h.clients, c)
+				close(c.send)
+				_ = c.conn.Close()
+			}
+		case msg := <-h.broadcast:
+			for c := range h.clients {
+				select {
+				case c.send <- msg:
+				default:
+					// Client is slow or dead; drop it.
+					delete(h.clients, c)
+					close(c.send)
+					_ = c.conn.Close()
+				}
+			}
+		}
+	}
+}
+
+// computeAccept computes the Sec-WebSocket-Accept header value.
+func computeAccept(key string) string {
+	const magic = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
+	h := sha1.New()
+	h.Write([]byte(key + magic))
+	return base64.StdEncoding.EncodeToString(h.Sum(nil))
+}
+
+// ServeWS upgrades the HTTP request to a WebSocket connection and registers a client.
+func (h *Hub) ServeWS(w http.ResponseWriter, r *http.Request) {
+	if !strings.Contains(strings.ToLower(r.Header.Get("Connection")), "upgrade") || strings.ToLower(r.Header.Get("Upgrade")) != "websocket" {
+		http.Error(w, "upgrade required", http.StatusBadRequest)
+		return
+	}
+	key := r.Header.Get("Sec-WebSocket-Key")
+	if key == "" {
+		http.Error(w, "missing Sec-WebSocket-Key", http.StatusBadRequest)
+		return
+	}
+	accept := computeAccept(key)
+
+	hj, ok := w.(http.Hijacker)
+	if !ok {
+		http.Error(w, "websocket not supported", http.StatusInternalServerError)
+		return
+	}
+	conn, buf, err := hj.Hijack()
+	if err != nil {
+		return
+	}
+
+	// Write the upgrade response
+	response := "HTTP/1.1 101 Switching Protocols\r\n" +
+		"Upgrade: websocket\r\n" +
+		"Connection: Upgrade\r\n" +
+		"Sec-WebSocket-Accept: " + accept + "\r\n" +
+		"\r\n"
+	if _, err := buf.WriteString(response); err != nil {
+		_ = conn.Close()
+		return
+	}
+	if err := buf.Flush(); err != nil {
+		_ = conn.Close()
+		return
+	}
+
+	client := &Client{
+		hub:  h,
+		conn: conn,
+		send: make(chan []byte, 256),
+	}
+	h.register <- client
+	go client.writePump()
+	go client.readPump()
+}
+
+// writeWSFrame writes a single WebSocket frame to the writer.
+func writeWSFrame(w io.Writer, opcode byte, payload []byte) error {
+	// FIN set, opcode as provided
+	header := []byte{0x80 | (opcode & 0x0F)}
+	l := len(payload)
+	switch {
+	case l < 126:
+		header = append(header, byte(l))
+	case l <= 65535:
+		ext := make([]byte, 2)
+		binary.BigEndian.PutUint16(ext, uint16(l))
+		header = append(header, 126)
+		header = append(header, ext...)
+	default:
+		ext := make([]byte, 8)
+		binary.BigEndian.PutUint64(ext, uint64(l))
+		header = append(header, 127)
+		header = append(header, ext...)
+	}
+	if _, err := w.Write(header); err != nil {
+		return err
+	}
+	if l > 0 {
+		if _, err := w.Write(payload); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// readPump handles control frames from the client and discards other incoming frames.
+// This server is broadcast-only to clients.
+func (c *Client) readPump() {
+	defer func() {
+		c.hub.unregister <- c
+	}()
+	reader := bufio.NewReader(c.conn)
+	for {
+		// Read first two bytes
+		b1, err := reader.ReadByte()
+		if err != nil {
+			return
+		}
+		b2, err := reader.ReadByte()
+		if err != nil {
+			return
+		}
+		opcode := b1 & 0x0F
+		masked := (b2 & 0x80) != 0
+		length := int64(b2 & 0x7F)
+		if length == 126 {
+			ext := make([]byte, 2)
+			if _, err := io.ReadFull(reader, ext); err != nil {
+				return
+			}
+			length = int64(binary.BigEndian.Uint16(ext))
+		} else if length == 127 {
+			ext := make([]byte, 8)
+			if _, err := io.ReadFull(reader, ext); err != nil {
+				return
+			}
+			length = int64(binary.BigEndian.Uint64(ext))
+		}
+		var maskKey [4]byte
+		if masked {
+			if _, err := io.ReadFull(reader, maskKey[:]); err != nil {
+				return
+			}
+		}
+
+		// Handle Ping -> Pong
+		if opcode == 0x9 && length <= 125 {
+			payload := make([]byte, length)
+			if _, err := io.ReadFull(reader, payload); err != nil {
+				return
+			}
+			// Unmask if masked
+			if masked {
+				for i := int64(0); i < length; i++ {
+					payload[i] ^= maskKey[i%4]
+				}
+			}
+			_ = writeWSFrame(c.conn, 0xA, payload) // best-effort pong
+			continue
+		}
+
+		// Close frame
+		if opcode == 0x8 {
+			// Drain payload if any, then exit
+			if _, err := io.CopyN(io.Discard, reader, length); err != nil {
+				return
+			}
+			return
+		}
+
+		// For other frames, just discard payload
+		if _, err := io.CopyN(io.Discard, reader, length); err != nil {
+			return
+		}
+	}
+}
+
+// writePump sends queued messages to the client and pings periodically to keep the connection alive.
+func (c *Client) writePump() {
+	ticker := time.NewTicker(30 * time.Second)
+	defer func() {
+		ticker.Stop()
+		_ = c.conn.Close()
+	}()
+	for {
+		select {
+		case msg, ok := <-c.send:
+			if !ok {
+				// try to send close frame
+				_ = writeWSFrame(c.conn, 0x8, nil)
+				return
+			}
+			if err := writeWSFrame(c.conn, 0x1, msg); err != nil {
+				return
+			}
+		case <-ticker.C:
+			// Send a ping to keep connections alive behind proxies
+			_ = writeWSFrame(c.conn, 0x9, []byte("ping"))
+		}
+	}
+}

cmd/backoffice/main.go

@@ -1,5 +1,152 @@
 package main
 
-func main() {
-	// Your code here
+import (
+	"context"
+	"errors"
+	"log"
+	"net/http"
+	"os"
+	"time"
+
+	actor "git.tornberg.me/go-cart-actor/pkg/actor"
+	"git.tornberg.me/go-cart-actor/pkg/cart"
+	"github.com/matst80/slask-finder/pkg/messaging"
+	amqp "github.com/rabbitmq/amqp091-go"
+)
+
+type CartFileInfo struct {
+	ID       string      `json:"id"`
+	CartId   cart.CartId `json:"cartId"`
+	Size     int64       `json:"size"`
+	Modified time.Time   `json:"modified"`
+}
+
+func envOrDefault(key, def string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return def
+}
+
+func startMutationConsumer(ctx context.Context, conn *amqp.Connection, hub *Hub) error {
+	ch, err := conn.Channel()
+	if err != nil {
+		_ = conn.Close()
+		return err
+	}
+	msgs, err := messaging.DeclareBindAndConsume(ch, "cart", "mutation")
+	if err != nil {
+		_ = ch.Close()
+		return err
+	}
+
+	go func() {
+		defer ch.Close()
+
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case m, ok := <-msgs:
+				if !ok {
+					log.Fatalf("connection closed")
+					continue
+				}
+				// Log and broadcast to all websocket clients
+				log.Printf("mutation event: %s", string(m.Body))
+
+				if hub != nil {
+					select {
+					case hub.broadcast <- m.Body:
+					default:
+						// if hub queue is full, drop to avoid blocking
+					}
+				}
+				if err := m.Ack(false); err != nil {
+					log.Printf("error acknowledging message: %v", err)
+				}
+			}
+		}
+	}()
+	return nil
+}
+
+func main() {
+	dataDir := envOrDefault("DATA_DIR", "data")
+	addr := envOrDefault("ADDR", ":8080")
+	amqpURL := os.Getenv("AMQP_URL")
+
+	_ = os.MkdirAll(dataDir, 0755)
+
+	reg := cart.NewCartMultationRegistry()
+	diskStorage := actor.NewDiskStorage[cart.CartGrain](dataDir, reg)
+
+	fs := NewFileServer(dataDir, diskStorage)
+
+	hub := NewHub()
+	go hub.Run()
+
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /carts", fs.CartsHandler)
+	mux.HandleFunc("GET /cart/{id}", fs.CartHandler)
+	mux.HandleFunc("/promotions", fs.PromotionsHandler)
+	mux.HandleFunc("/vouchers", fs.VoucherHandler)
+	mux.HandleFunc("/promotion/{id}", fs.PromotionPartHandler)
+
+	mux.HandleFunc("/ws", hub.ServeWS)
+	mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte("ok"))
+	})
+	mux.HandleFunc("/readyz", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte("ok"))
+	})
+	mux.HandleFunc("/livez", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte("ok"))
+	})
+
+	// Global CORS middleware allowing all origins and handling preflight
+	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
+		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With")
+		w.Header().Set("Access-Control-Expose-Headers", "*")
+		if r.Method == http.MethodOptions {
+			w.WriteHeader(http.StatusNoContent)
+			return
+		}
+		mux.ServeHTTP(w, r)
+	})
+
+	srv := &http.Server{
+		Addr:         addr,
+		Handler:      handler,
+		ReadTimeout:  15 * time.Second,
+		WriteTimeout: 30 * time.Second,
+		IdleTimeout:  60 * time.Second,
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	if amqpURL != "" {
+		conn, err := amqp.Dial(amqpURL)
+		if err != nil {
+			log.Fatalf("failed to connect to RabbitMQ: %v", err)
+		}
+		if err := startMutationConsumer(ctx, conn, hub); err != nil {
+			log.Printf("AMQP listener disabled: %v", err)
+		} else {
+			log.Printf("AMQP listener connected")
+		}
+	}
+
+	log.Printf("backoffice HTTP listening on %s (dataDir=%s)", addr, dataDir)
+	if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+		log.Fatalf("http server error: %v", err)
+	}
+
+	// server stopped
 }

cmd/cart/amqp-order-handler.go

@@ -9,53 +9,56 @@ import (
 )
 
 type AmqpOrderHandler struct {
-	Url        string
-	Connection *amqp.Connection
-	Channel    *amqp.Channel
+	conn  *amqp.Connection
+	queue *amqp.Queue
 }
 
-func (h *AmqpOrderHandler) Connect() error {
-	conn, err := amqp.Dial(h.Url)
-	if err != nil {
-		return fmt.Errorf("failed to connect to RabbitMQ: %w", err)
+func NewAmqpOrderHandler(conn *amqp.Connection) *AmqpOrderHandler {
+	return &AmqpOrderHandler{
+		conn: conn,
 	}
-	h.Connection = conn
+}
 
-	ch, err := conn.Channel()
+func (h *AmqpOrderHandler) DefineQueue() error {
+	ch, err := h.conn.Channel()
 	if err != nil {
 		return fmt.Errorf("failed to open a channel: %w", err)
 	}
-	h.Channel = ch
+	defer ch.Close()
 
-	return nil
-}
-
-func (h *AmqpOrderHandler) Close() error {
-	if h.Channel != nil {
-		h.Channel.Close()
-	}
-	if h.Connection != nil {
-		return h.Connection.Close()
+	queue, err := ch.QueueDeclare(
+		"order-queue", // name
+		false,
+		false,
+		false,
+		false,
+		nil,
+	)
+	if err != nil {
+		return fmt.Errorf("failed to declare an exchange: %w", err)
 	}
+	h.queue = &queue
 	return nil
 }
 
 func (h *AmqpOrderHandler) OrderCompleted(body []byte) error {
+	ch, err := h.conn.Channel()
+	if err != nil {
+		return fmt.Errorf("failed to open a channel: %w", err)
+	}
+	defer ch.Close()
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 
-	err := h.Channel.PublishWithContext(ctx,
-		"orders", // exchange
-		"new",    // routing key
-		false,    // mandatory
-		false,    // immediate
+	return ch.PublishWithContext(ctx,
+		"",           // exchange
+		h.queue.Name, // routing key
+		false,        // mandatory
+		false,        // immediate
 		amqp.Publishing{
+			//DeliveryMode: amqp.,
 			ContentType: "application/json",
 			Body:        body,
 		})
-	if err != nil {
-		return fmt.Errorf("failed to publish a message: %w", err)
-	}
 
-	return nil
 }

cmd/cart/checkout_builder.go

@@ -3,6 +3,8 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+
+	"git.tornberg.me/go-cart-actor/pkg/cart"
 )
 
 // CheckoutMeta carries the external / URL metadata required to build a
@@ -12,8 +14,6 @@ type CheckoutMeta struct {
 	Terms        string
 	Checkout     string
 	Confirmation string
-	Validation   string
-	Push         string
 	Country      string
 	Currency     string // optional override (defaults to "SEK" if empty)
 	Locale       string // optional override (defaults to "sv-se" if empty)
@@ -33,7 +33,7 @@ type CheckoutMeta struct {
 //
 // If you later need to support different tax rates per line, you can extend
 // CartItem / Delivery to expose that data and propagate it here.
-func BuildCheckoutOrderPayload(grain *CartGrain, meta *CheckoutMeta) ([]byte, *CheckoutOrder, error) {
+func BuildCheckoutOrderPayload(grain *cart.CartGrain, meta *CheckoutMeta) ([]byte, *CheckoutOrder, error) {
 	if grain == nil {
 		return nil, nil, fmt.Errorf("nil grain")
 	}
@@ -67,7 +67,7 @@ func BuildCheckoutOrderPayload(grain *CartGrain, meta *CheckoutMeta) ([]byte, *C
 			Name:           it.Meta.Name,
 			Quantity:       it.Quantity,
 			UnitPrice:      int(it.Price.IncVat),
-			TaxRate:        2500, // TODO: derive if variable tax rates are introduced
+			TaxRate:        it.Tax, // TODO: derive if variable tax rates are introduced
 			QuantityUnit:   "st",
 			TotalAmount:    int(it.TotalPrice.IncVat),
 			TotalTaxAmount: int(it.TotalPrice.TotalVat()),
@@ -105,8 +105,9 @@ func BuildCheckoutOrderPayload(grain *CartGrain, meta *CheckoutMeta) ([]byte, *C
 			Terms:        meta.Terms,
 			Checkout:     meta.Checkout,
 			Confirmation: meta.Confirmation,
-			Validation:   meta.Validation,
-			Push:         meta.Push,
+			Notification: "https://cart.tornberg.me/notification",
+			Validation:   "https://cart.tornberg.me/validate",
+			Push:         "https://cart.tornberg.me/push?order_id={checkout.order.id}",
 		},
 	}
 

cmd/cart/checkout_server.go

@@ -0,0 +1,203 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+
+	"git.tornberg.me/go-cart-actor/pkg/actor"
+	"git.tornberg.me/go-cart-actor/pkg/cart"
+	"git.tornberg.me/go-cart-actor/pkg/messages"
+	"git.tornberg.me/mats/go-redis-inventory/pkg/inventory"
+	amqp "github.com/rabbitmq/amqp091-go"
+)
+
+var tpl = `<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>s10r testing - checkout</title>
+  </head>
+
+  <body>
+    %s
+  </body>
+</html>
+`
+
+func (a *App) getGrainFromOrder(ctx context.Context, order *CheckoutOrder) (*cart.CartGrain, error) {
+	cartId, ok := cart.ParseCartId(order.MerchantReference1)
+	if !ok {
+		return nil, fmt.Errorf("invalid cart id in order reference: %s", order.MerchantReference1)
+	}
+	grain, err := a.pool.Get(ctx, uint64(cartId))
+	if err != nil {
+		return nil, fmt.Errorf("failed to get cart grain: %w", err)
+	}
+	return grain, nil
+}
+
+func (a *App) HandleCheckoutRequests(amqpUrl string, mux *http.ServeMux, inventoryService inventory.InventoryService) {
+	conn, err := amqp.Dial(amqpUrl)
+	if err != nil {
+		log.Fatalf("failed to connect to RabbitMQ: %v", err)
+	}
+
+	amqpListener := actor.NewAmqpListener(conn, func(id uint64, msg []actor.ApplyResult) (any, error) {
+		return &CartChangeEvent{
+			CartId:    cart.CartId(id),
+			Mutations: msg,
+		}, nil
+	})
+	amqpListener.DefineTopics()
+	a.pool.AddListener(amqpListener)
+	orderHandler := NewAmqpOrderHandler(conn)
+	orderHandler.DefineQueue()
+
+	mux.HandleFunc("/push", func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("Klarna order confirmation push, method: %s", r.Method)
+		if r.Method != http.MethodPost {
+			w.WriteHeader(http.StatusMethodNotAllowed)
+			return
+		}
+		orderId := r.URL.Query().Get("order_id")
+		log.Printf("Order confirmation push: %s", orderId)
+
+		order, err := a.klarnaClient.GetOrder(r.Context(), orderId)
+
+		if err != nil {
+			log.Printf("Error creating request: %v\n", err)
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+
+		grain, err := a.getGrainFromOrder(r.Context(), order)
+		if err != nil {
+			logger.ErrorContext(r.Context(), "Unable to get grain from klarna order", "error", err.Error())
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+
+		if inventoryService != nil {
+			inventoryRequests := getInventoryRequests(grain.Items)
+			err = inventoryService.ReserveInventory(r.Context(), inventoryRequests...)
+
+			if err != nil {
+				logger.WarnContext(r.Context(), "placeorder inventory reservation failed")
+				w.WriteHeader(http.StatusNotAcceptable)
+				return
+			}
+			a.pool.Apply(r.Context(), uint64(grain.Id), &messages.InventoryReserved{
+				Id:     grain.Id.String(),
+				Status: "success",
+			})
+		}
+
+		err = confirmOrder(r.Context(), order, orderHandler)
+		if err != nil {
+			log.Printf("Error confirming order: %v\n", err)
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+
+		err = triggerOrderCompleted(r.Context(), a.server, order)
+		if err != nil {
+			log.Printf("Error processing cart message: %v\n", err)
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+		err = a.klarnaClient.AcknowledgeOrder(r.Context(), orderId)
+		if err != nil {
+			log.Printf("Error acknowledging order: %v\n", err)
+		}
+
+		w.WriteHeader(http.StatusOK)
+	})
+
+	mux.HandleFunc("GET /checkout", a.server.CheckoutHandler(func(order *CheckoutOrder, w http.ResponseWriter) error {
+		w.Header().Set("Content-Type", "text/html; charset=utf-8")
+		w.Header().Set("Permissions-Policy", "payment=(self \"https://js.stripe.com\" \"https://m.stripe.network\" \"https://js.playground.kustom.co\")")
+		w.WriteHeader(http.StatusOK)
+		_, err := fmt.Fprintf(w, tpl, order.HTMLSnippet)
+		return err
+	}))
+
+	mux.HandleFunc("GET /confirmation/{order_id}", func(w http.ResponseWriter, r *http.Request) {
+
+		orderId := r.PathValue("order_id")
+		order, err := a.klarnaClient.GetOrder(r.Context(), orderId)
+
+		if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			w.Write([]byte(err.Error()))
+			return
+		}
+
+		w.Header().Set("Content-Type", "text/html; charset=utf-8")
+		if order.Status == "checkout_complete" {
+			http.SetCookie(w, &http.Cookie{
+				Name:     "cartid",
+				Value:    "",
+				Path:     "/",
+				Secure:   true,
+				HttpOnly: true,
+				Expires:  time.Unix(0, 0),
+				SameSite: http.SameSiteLaxMode,
+			})
+		}
+
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprintf(w, tpl, order.HTMLSnippet)
+	})
+	mux.HandleFunc("/notification", func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("Klarna order notification, method: %s", r.Method)
+		logger.InfoContext(r.Context(), "Klarna order notification received", "method", r.Method)
+		if r.Method != "POST" {
+			w.WriteHeader(http.StatusMethodNotAllowed)
+			return
+		}
+		order := &CheckoutOrder{}
+		err := json.NewDecoder(r.Body).Decode(order)
+		if err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+		}
+		log.Printf("Klarna order notification: %s", order.ID)
+		logger.InfoContext(r.Context(), "Klarna order notification received", "order_id", order.ID)
+
+		w.WriteHeader(http.StatusOK)
+	})
+	mux.HandleFunc("POST /validate", func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("Klarna order validation, method: %s", r.Method)
+		if r.Method != "POST" {
+			w.WriteHeader(http.StatusMethodNotAllowed)
+			return
+		}
+		order := &CheckoutOrder{}
+		err := json.NewDecoder(r.Body).Decode(order)
+		if err != nil {
+			w.WriteHeader(http.StatusBadRequest)
+		}
+		logger.InfoContext(r.Context(), "Klarna order validation received", "order_id", order.ID, "cart_id", order.MerchantReference1)
+		grain, err := a.getGrainFromOrder(r.Context(), order)
+		if err != nil {
+			logger.ErrorContext(r.Context(), "Unable to get grain from klarna order", "error", err.Error())
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+		if inventoryService != nil {
+			inventoryRequests := getInventoryRequests(grain.Items)
+			_, err = inventoryService.ReservationCheck(r.Context(), inventoryRequests...)
+			if err != nil {
+				logger.WarnContext(r.Context(), "placeorder inventory check failed")
+				w.WriteHeader(http.StatusNotAcceptable)
+				return
+			}
+		}
+
+		w.WriteHeader(http.StatusOK)
+	})
+}

cmd/cart/k8s-host-discovery.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"log"
+
+	"git.tornberg.me/go-cart-actor/pkg/actor"
+	"git.tornberg.me/go-cart-actor/pkg/cart"
+	"git.tornberg.me/go-cart-actor/pkg/discovery"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+)
+
+func GetDiscovery() discovery.Discovery {
+	if podIp == "" {
+		return nil
+	}
+
+	config, kerr := rest.InClusterConfig()
+
+	if kerr != nil {
+		log.Fatalf("Error creating kubernetes client: %v\n", kerr)
+	}
+	client, err := kubernetes.NewForConfig(config)
+	if err != nil {
+		log.Fatalf("Error creating client: %v\n", err)
+	}
+	return discovery.NewK8sDiscovery(client)
+}
+
+func UseDiscovery(pool actor.GrainPool[*cart.CartGrain]) {
+
+	go func(hw discovery.Discovery) {
+		if hw == nil {
+			log.Print("No discovery service available")
+			return
+		}
+		ch, err := hw.Watch()
+		if err != nil {
+			log.Printf("Discovery error: %v", err)
+			return
+		}
+		for evt := range ch {
+			if evt.Host == "" {
+				continue
+			}
+			switch evt.IsReady {
+			case false:
+				if pool.IsKnown(evt.Host) {
+					log.Printf("Host %s is not ready, removing", evt.Host)
+					pool.RemoveHost(evt.Host)
+				}
+			default:
+				if !pool.IsKnown(evt.Host) {
+					log.Printf("Discovered host %s", evt.Host)
+					pool.AddRemoteHost(evt.Host)
+				}
+			}
+		}
+	}(GetDiscovery())
+}

cmd/cart/klarna-client.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -30,11 +31,14 @@ const (
 	KlarnaPlaygroundUrl = "https://api.playground.klarna.com"
 )
 
-func (k *KlarnaClient) GetOrder(orderId string) (*CheckoutOrder, error) {
+func (k *KlarnaClient) GetOrder(ctx context.Context, orderId string) (*CheckoutOrder, error) {
 	req, err := http.NewRequest("GET", k.Url+"/checkout/v3/orders/"+orderId, nil)
 	if err != nil {
 		return nil, err
 	}
+	spanCtx, span := tracer.Start(ctx, "Get klarna order")
+	defer span.End()
+	req = req.WithContext(spanCtx)
 	req.Header.Add("Content-Type", "application/json")
 	req.SetBasicAuth(k.UserName, k.Password)
 
@@ -64,13 +68,15 @@ func (k *KlarnaClient) getOrderResponse(res *http.Response) (*CheckoutOrder, err
 	return nil, fmt.Errorf("%s", res.Status)
 }
 
-func (k *KlarnaClient) CreateOrder(reader io.Reader) (*CheckoutOrder, error) {
+func (k *KlarnaClient) CreateOrder(ctx context.Context, reader io.Reader) (*CheckoutOrder, error) {
 	//bytes.NewReader(reply.Payload)
 	req, err := http.NewRequest("POST", k.Url+"/checkout/v3/orders", reader)
 	if err != nil {
 		return nil, err
 	}
-
+	spanCtx, span := tracer.Start(ctx, "Create klarna order")
+	defer span.End()
+	req = req.WithContext(spanCtx)
 	req.Header.Add("Content-Type", "application/json")
 	req.SetBasicAuth(k.UserName, k.Password)
 
@@ -82,13 +88,16 @@ func (k *KlarnaClient) CreateOrder(reader io.Reader) (*CheckoutOrder, error) {
 	return k.getOrderResponse(res)
 }
 
-func (k *KlarnaClient) UpdateOrder(orderId string, reader io.Reader) (*CheckoutOrder, error) {
+func (k *KlarnaClient) UpdateOrder(ctx context.Context, orderId string, reader io.Reader) (*CheckoutOrder, error) {
 	//bytes.NewReader(reply.Payload)
 	req, err := http.NewRequest("POST", fmt.Sprintf("%s/checkout/v3/orders/%s", k.Url, orderId), reader)
 	if err != nil {
 		return nil, err
 	}
 
+	spanCtx, span := tracer.Start(ctx, "Update klarna order")
+	defer span.End()
+	req = req.WithContext(spanCtx)
 	req.Header.Add("Content-Type", "application/json")
 	req.SetBasicAuth(k.UserName, k.Password)
 
@@ -100,12 +109,14 @@ func (k *KlarnaClient) UpdateOrder(orderId string, reader io.Reader) (*CheckoutO
 	return k.getOrderResponse(res)
 }
 
-func (k *KlarnaClient) AbortOrder(orderId string) error {
+func (k *KlarnaClient) AbortOrder(ctx context.Context, orderId string) error {
 	req, err := http.NewRequest("POST", fmt.Sprintf("%s/checkout/v3/orders/%s/abort", k.Url, orderId), nil)
 	if err != nil {
 		return err
 	}
-
+	spanCtx, span := tracer.Start(ctx, "Abort klarna order")
+	defer span.End()
+	req = req.WithContext(spanCtx)
 	req.SetBasicAuth(k.UserName, k.Password)
 
 	_, err = http.DefaultClient.Do(req)
@@ -113,11 +124,14 @@ func (k *KlarnaClient) AbortOrder(orderId string) error {
 }
 
 // ordermanagement/v1/orders/{order_id}/acknowledge
-func (k *KlarnaClient) AcknowledgeOrder(orderId string) error {
+func (k *KlarnaClient) AcknowledgeOrder(ctx context.Context, orderId string) error {
 	req, err := http.NewRequest("POST", fmt.Sprintf("%s/ordermanagement/v1/orders/%s/acknowledge", k.Url, orderId), nil)
 	if err != nil {
 		return err
 	}
+	spanCtx, span := tracer.Start(ctx, "Acknowledge klarna order")
+	defer span.End()
+	req = req.WithContext(spanCtx)
 	id := uuid.New()
 
 	req.SetBasicAuth(k.UserName, k.Password)

cmd/cart/main.go

@@ -1,28 +1,30 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"log"
+	"net"
 	"net/http"
 	"net/http/pprof"
 	"os"
 	"os/signal"
 	"strings"
-	"syscall"
 	"time"
 
 	"git.tornberg.me/go-cart-actor/pkg/actor"
-	"git.tornberg.me/go-cart-actor/pkg/discovery"
+	"git.tornberg.me/go-cart-actor/pkg/cart"
 	messages "git.tornberg.me/go-cart-actor/pkg/messages"
+	"git.tornberg.me/go-cart-actor/pkg/promotions"
 	"git.tornberg.me/go-cart-actor/pkg/proxy"
 	"git.tornberg.me/go-cart-actor/pkg/voucher"
+	"git.tornberg.me/mats/go-redis-inventory/pkg/inventory"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
-	"k8s.io/apimachinery/pkg/watch"
-	"k8s.io/client-go/kubernetes"
-	"k8s.io/client-go/rest"
+	"github.com/redis/go-redis/v9"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 )
 
 var (
@@ -30,14 +32,6 @@ var (
 		Name: "cart_grain_spawned_total",
 		Help: "The total number of spawned grains",
 	})
-	grainMutations = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "cart_grain_mutations_total",
-		Help: "The total number of mutations",
-	})
-	grainLookups = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "cart_grain_lookups_total",
-		Help: "The total number of lookups",
-	})
 )
 
 func init() {
@@ -45,26 +39,16 @@ func init() {
 }
 
 type App struct {
-	pool *actor.SimpleGrainPool[CartGrain]
+	pool         *actor.SimpleGrainPool[cart.CartGrain]
+	server       *PoolServer
+	klarnaClient *KlarnaClient
 }
 
 var podIp = os.Getenv("POD_IP")
 var name = os.Getenv("POD_NAME")
 var amqpUrl = os.Getenv("AMQP_URL")
-
-var tpl = `<!DOCTYPE html>
-<html lang="en">
-  <head>
-    <meta charset="UTF-8" />
-    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>s10r testing - checkout</title>
-  </head>
-
-  <body>
-    %s
-  </body>
-</html>
-`
+var redisAddress = os.Getenv("REDIS_ADDRESS")
+var redisPassword = os.Getenv("REDIS_PASSWORD")
 
 func getCountryFromHost(host string) string {
 	if strings.Contains(strings.ToLower(host), "-no") {
@@ -76,86 +60,57 @@ func getCountryFromHost(host string) string {
 	return ""
 }
 
-func GetDiscovery() discovery.Discovery {
-	if podIp == "" {
-		return nil
-	}
-
-	config, kerr := rest.InClusterConfig()
-
-	if kerr != nil {
-		log.Fatalf("Error creating kubernetes client: %v\n", kerr)
-	}
-	client, err := kubernetes.NewForConfig(config)
-	if err != nil {
-		log.Fatalf("Error creating client: %v\n", err)
-	}
-	return discovery.NewK8sDiscovery(client)
-}
-
 type MutationContext struct {
 	VoucherService voucher.Service
 }
 
+type CartChangeEvent struct {
+	CartId    cart.CartId         `json:"cartId"`
+	Mutations []actor.ApplyResult `json:"mutations"`
+}
+
 func main() {
 
 	controlPlaneConfig := actor.DefaultServerConfig()
 
-	reg := actor.NewMutationRegistry()
-	reg.RegisterMutations(
-		actor.NewMutation(AddItem, func() *messages.AddItem {
-			return &messages.AddItem{}
-		}),
-		actor.NewMutation(ChangeQuantity, func() *messages.ChangeQuantity {
-			return &messages.ChangeQuantity{}
-		}),
-		actor.NewMutation(RemoveItem, func() *messages.RemoveItem {
-			return &messages.RemoveItem{}
-		}),
-		actor.NewMutation(InitializeCheckout, func() *messages.InitializeCheckout {
-			return &messages.InitializeCheckout{}
-		}),
-		actor.NewMutation(OrderCreated, func() *messages.OrderCreated {
-			return &messages.OrderCreated{}
-		}),
-		actor.NewMutation(RemoveDelivery, func() *messages.RemoveDelivery {
-			return &messages.RemoveDelivery{}
-		}),
-		actor.NewMutation(SetDelivery, func() *messages.SetDelivery {
-			return &messages.SetDelivery{}
-		}),
-		actor.NewMutation(SetPickupPoint, func() *messages.SetPickupPoint {
-			return &messages.SetPickupPoint{}
-		}),
-		actor.NewMutation(ClearCart, func() *messages.ClearCartRequest {
-			return &messages.ClearCartRequest{}
-		}),
-		actor.NewMutation(AddVoucher, func() *messages.AddVoucher {
-			return &messages.AddVoucher{}
-		}),
-		actor.NewMutation(RemoveVoucher, func() *messages.RemoveVoucher {
-			return &messages.RemoveVoucher{}
+	promotionData, err := promotions.LoadStateFile("data/promotions.json")
+	if err != nil {
+		log.Printf("Error loading promotions: %v\n", err)
+	}
+
+	log.Printf("loaded %d promotions", len(promotionData.State.Promotions))
+
+	promotionService := promotions.NewPromotionService(nil)
+
+	reg := cart.NewCartMultationRegistry()
+	reg.RegisterProcessor(
+		actor.NewMutationProcessor(func(ctx context.Context, g *cart.CartGrain) error {
+			_, span := tracer.Start(ctx, "Totals and promotions")
+			defer span.End()
+			g.UpdateTotals()
+
+			promotionCtx := promotions.NewContextFromCart(g, promotions.WithNow(time.Now()), promotions.WithCustomerSegment("vip"))
+			_, actions := promotionService.EvaluateAll(promotionData.State.Promotions, promotionCtx)
+			for _, action := range actions {
+				log.Printf("apply: %+v", action)
+				g.UpdateTotals()
+			}
+			return nil
 		}),
 	)
-	diskStorage := actor.NewDiskStorage[CartGrain]("data", reg)
-	poolConfig := actor.GrainPoolConfig[CartGrain]{
+
+	diskStorage := actor.NewDiskStorage[cart.CartGrain]("data", reg)
+	poolConfig := actor.GrainPoolConfig[cart.CartGrain]{
 		MutationRegistry: reg,
 		Storage:          diskStorage,
-		Spawn: func(id uint64) (actor.Grain[CartGrain], error) {
+		Spawn: func(ctx context.Context, id uint64) (actor.Grain[cart.CartGrain], error) {
+			_, span := tracer.Start(ctx, fmt.Sprintf("Spawn cart id %d", id))
+			defer span.End()
 			grainSpawns.Inc()
-			ret := &CartGrain{
-				lastItemId:     0,
-				lastDeliveryId: 0,
-				Deliveries:     []*CartDelivery{},
-				Id:             CartId(id),
-				Items:          []*CartItem{},
-				TotalPrice:     NewPrice(),
-			}
+			ret := cart.NewCartGrain(id, time.Now())
 			// Set baseline lastChange at spawn; replay may update it to last event timestamp.
-			ret.lastChange = time.Now()
-			ret.lastAccess = time.Now()
 
-			err := diskStorage.LoadEvents(id, ret)
+			err := diskStorage.LoadEvents(ctx, id, ret)
 
 			return ret, err
 		},
@@ -171,66 +126,71 @@ func main() {
 	if err != nil {
 		log.Fatalf("Error creating cart pool: %v\n", err)
 	}
-	app := &App{
-		pool: pool,
+
+	pool.SetPubSub(actor.NewPubSub(func(id uint64, event actor.Event) {
+		grain, _ := pool.Get(context.Background(), id)
+		if sub, ok := any(grain).(actor.Subscribable); ok {
+			sub.Notify(event)
+		}
+	}))
+
+	klarnaClient := NewKlarnaClient(KlarnaPlaygroundUrl, os.Getenv("KLARNA_API_USERNAME"), os.Getenv("KLARNA_API_PASSWORD"))
+	rdb := redis.NewClient(&redis.Options{
+		Addr:     redisAddress,
+		Password: redisPassword,
+		DB:       0,
+	})
+	inventoryService, err := inventory.NewRedisInventoryService(rdb)
+	if err != nil {
+		log.Fatalf("Error creating inventory service: %v\n", err)
 	}
 
-	grpcSrv, err := actor.NewControlServer[*CartGrain](controlPlaneConfig, pool)
+	syncedServer := NewPoolServer(pool, fmt.Sprintf("%s, %s", name, podIp), klarnaClient, inventoryService)
+
+	app := &App{
+		pool:         pool,
+		server:       syncedServer,
+		klarnaClient: klarnaClient,
+	}
+
+	mux := http.NewServeMux()
+	debugMux := http.NewServeMux()
+
+	if amqpUrl == "" {
+		log.Printf("no connection to amqp defined")
+	} else {
+		app.HandleCheckoutRequests(amqpUrl, mux, inventoryService)
+	}
+
+	grpcSrv, err := actor.NewControlServer[*cart.CartGrain](controlPlaneConfig, pool)
 	if err != nil {
 		log.Fatalf("Error starting control plane gRPC server: %v\n", err)
 	}
 	defer grpcSrv.GracefulStop()
 
-	go diskStorage.SaveLoop(10 * time.Second)
+	// go diskStorage.SaveLoop(10 * time.Second)
+	UseDiscovery(pool)
 
-	go func(hw discovery.Discovery) {
-		if hw == nil {
-			log.Print("No discovery service available")
-			return
-		}
-		ch, err := hw.Watch()
-		if err != nil {
-			log.Printf("Discovery error: %v", err)
-			return
-		}
-		for evt := range ch {
-			if evt.Host == "" {
-				continue
-			}
-			switch evt.Type {
-			case watch.Deleted:
-				if pool.IsKnown(evt.Host) {
-					pool.RemoveHost(evt.Host)
-				}
-			default:
-				if !pool.IsKnown(evt.Host) {
-					log.Printf("Discovered host %s", evt.Host)
-					pool.AddRemote(evt.Host)
-				}
-			}
-		}
-	}(GetDiscovery())
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
+	defer stop()
 
-	orderHandler := &AmqpOrderHandler{
-		Url: amqpUrl,
+	otelShutdown, err := setupOTelSDK(ctx)
+	if err != nil {
+		log.Fatalf("Unable to start otel %v", err)
 	}
-	klarnaClient := NewKlarnaClient(KlarnaPlaygroundUrl, os.Getenv("KLARNA_API_USERNAME"), os.Getenv("KLARNA_API_PASSWORD"))
 
-	syncedServer := NewPoolServer(pool, fmt.Sprintf("%s, %s", name, podIp), klarnaClient)
-	mux := http.NewServeMux()
-	mux.Handle("/cart/", http.StripPrefix("/cart", syncedServer.Serve()))
+	syncedServer.Serve(mux)
 	// only for local
 	mux.HandleFunc("GET /add/remote/{host}", func(w http.ResponseWriter, r *http.Request) {
 		pool.AddRemote(r.PathValue("host"))
 	})
-	// mux.HandleFunc("GET /save", app.HandleSave)
-	//mux.HandleFunc("/", app.RewritePath)
-	mux.HandleFunc("/debug/pprof/", pprof.Index)
-	mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
-	mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
-	mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
-	mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
-	mux.Handle("/metrics", promhttp.Handler())
+
+	debugMux.HandleFunc("/debug/pprof/", pprof.Index)
+	debugMux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
+	debugMux.HandleFunc("/debug/pprof/profile", pprof.Profile)
+	debugMux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
+	debugMux.HandleFunc("/debug/pprof/trace", pprof.Trace)
+	debugMux.Handle("/metrics", promhttp.Handler())
 	mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
 		// Grain pool health: simple capacity check (mirrors previous GrainHandler.IsHealthy)
 		grainCount, capacity := app.pool.LocalUsage()
@@ -256,152 +216,6 @@ func main() {
 		w.Write([]byte("ok"))
 	})
 
-	mux.HandleFunc("/checkout", func(w http.ResponseWriter, r *http.Request) {
-		orderId := r.URL.Query().Get("order_id")
-		order := &CheckoutOrder{}
-
-		if orderId == "" {
-			cookie, err := r.Cookie("cartid")
-			if err != nil {
-				w.WriteHeader(http.StatusBadRequest)
-				w.Write([]byte(err.Error()))
-				return
-			}
-			if cookie.Value == "" {
-				w.WriteHeader(http.StatusBadRequest)
-				w.Write([]byte("no cart id to checkout is empty"))
-				return
-			}
-			parsed, ok := ParseCartId(cookie.Value)
-			if !ok {
-				w.WriteHeader(http.StatusBadRequest)
-				w.Write([]byte("invalid cart id format"))
-				return
-			}
-			cartId := parsed
-			syncedServer.ProxyHandler(func(w http.ResponseWriter, r *http.Request, cartId CartId) error {
-				order, err = syncedServer.CreateOrUpdateCheckout(r.Host, cartId)
-				if err != nil {
-					return err
-				}
-				w.Header().Set("Content-Type", "text/html; charset=utf-8")
-				w.Header().Set("Permissions-Policy", "payment=(self \"https://js.stripe.com\" \"https://m.stripe.network\" \"https://js.playground.kustom.co\")")
-				w.WriteHeader(http.StatusOK)
-				fmt.Fprintf(w, tpl, order.HTMLSnippet)
-				return nil
-			})(cartId, w, r)
-
-			if err != nil {
-				w.WriteHeader(http.StatusInternalServerError)
-				w.Write([]byte(err.Error()))
-			}
-
-			// v2: Apply now returns *CartGrain; order creation handled inside grain (no payload to unmarshal)
-		} else {
-			order, err = klarnaClient.GetOrder(orderId)
-			if err != nil {
-				w.WriteHeader(http.StatusBadRequest)
-				w.Write([]byte(err.Error()))
-				return
-			}
-			w.Header().Set("Content-Type", "text/html; charset=utf-8")
-			w.Header().Set("Permissions-Policy", "payment=(self \"https://js.stripe.com\" \"https://m.stripe.network\" \"https://js.playground.kustom.co\")")
-			w.WriteHeader(http.StatusOK)
-			fmt.Fprintf(w, tpl, order.HTMLSnippet)
-		}
-
-	})
-	mux.HandleFunc("/confirmation/{order_id}", func(w http.ResponseWriter, r *http.Request) {
-
-		orderId := r.PathValue("order_id")
-		order, err := klarnaClient.GetOrder(orderId)
-
-		if err != nil {
-			w.WriteHeader(http.StatusInternalServerError)
-			w.Write([]byte(err.Error()))
-			return
-		}
-
-		w.Header().Set("Content-Type", "text/html; charset=utf-8")
-		if order.Status == "checkout_complete" {
-			http.SetCookie(w, &http.Cookie{
-				Name:     "cartid",
-				Value:    "",
-				Path:     "/",
-				Secure:   true,
-				HttpOnly: true,
-				Expires:  time.Unix(0, 0),
-				SameSite: http.SameSiteLaxMode,
-			})
-		}
-
-		w.WriteHeader(http.StatusOK)
-		fmt.Fprintf(w, tpl, order.HTMLSnippet)
-	})
-	mux.HandleFunc("/validate", func(w http.ResponseWriter, r *http.Request) {
-		log.Printf("Klarna order validation, method: %s", r.Method)
-		if r.Method != "POST" {
-			w.WriteHeader(http.StatusMethodNotAllowed)
-			return
-		}
-		order := &CheckoutOrder{}
-		err := json.NewDecoder(r.Body).Decode(order)
-		if err != nil {
-			w.WriteHeader(http.StatusBadRequest)
-		}
-		log.Printf("Klarna order validation: %s", order.ID)
-		//err = confirmOrder(order, orderHandler)
-		//if err != nil {
-		//	log.Printf("Error validating order: %v\n", err)
-		//	w.WriteHeader(http.StatusInternalServerError)
-		//	return
-		//}
-		//
-		//err = triggerOrderCompleted(err, syncedServer, order)
-		//if err != nil {
-		//	log.Printf("Error processing cart message: %v\n", err)
-		//	w.WriteHeader(http.StatusInternalServerError)
-		//	return
-		//}
-		w.WriteHeader(http.StatusOK)
-	})
-	mux.HandleFunc("/push", func(w http.ResponseWriter, r *http.Request) {
-
-		if r.Method != http.MethodPost {
-			w.WriteHeader(http.StatusMethodNotAllowed)
-			return
-		}
-		orderId := r.URL.Query().Get("order_id")
-		log.Printf("Order confirmation push: %s", orderId)
-
-		order, err := klarnaClient.GetOrder(orderId)
-
-		if err != nil {
-			log.Printf("Error creating request: %v\n", err)
-			w.WriteHeader(http.StatusInternalServerError)
-			return
-		}
-
-		err = confirmOrder(order, orderHandler)
-		if err != nil {
-			log.Printf("Error confirming order: %v\n", err)
-			w.WriteHeader(http.StatusInternalServerError)
-			return
-		}
-
-		err = triggerOrderCompleted(syncedServer, order)
-		if err != nil {
-			log.Printf("Error processing cart message: %v\n", err)
-			w.WriteHeader(http.StatusInternalServerError)
-			return
-		}
-		err = klarnaClient.AcknowledgeOrder(orderId)
-		if err != nil {
-			log.Printf("Error acknowledging order: %v\n", err)
-		}
-
-		w.WriteHeader(http.StatusOK)
-	})
 	mux.HandleFunc("/version", func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusOK)
 		w.Write([]byte("1.0.0"))
@@ -409,49 +223,64 @@ func main() {
 
 	mux.HandleFunc("/openapi.json", ServeEmbeddedOpenAPI)
 
-	sigs := make(chan os.Signal, 1)
-	done := make(chan bool, 1)
-	signal.Notify(sigs, syscall.SIGTERM)
+	srv := &http.Server{
+		Addr:         ":8080",
+		BaseContext:  func(net.Listener) context.Context { return ctx },
+		ReadTimeout:  10 * time.Second,
+		WriteTimeout: 20 * time.Second,
+		Handler:      otelhttp.NewHandler(mux, "/"),
+	}
 
-	go func() {
-		sig := <-sigs
-		fmt.Println("Shutting down due to signal:", sig)
+	defer func() {
+
+		fmt.Println("Shutting down due to signal")
+		otelShutdown(context.Background())
 		diskStorage.Close()
 		pool.Close()
 
-		done <- true
+	}()
+
+	srvErr := make(chan error, 1)
+	go func() {
+		srvErr <- srv.ListenAndServe()
 	}()
 
 	log.Print("Server started at port 8080")
-	go http.ListenAndServe(":8080", mux)
-	<-done
+
+	go http.ListenAndServe(":8081", debugMux)
+
+	select {
+	case err = <-srvErr:
+		// Error when starting HTTP server.
+		log.Fatalf("Unable to start server: %v", err)
+	case <-ctx.Done():
+		// Wait for first CTRL+C.
+		// Stop receiving signal notifications as soon as possible.
+		stop()
+	}
 
 }
 
-func triggerOrderCompleted(syncedServer *PoolServer, order *CheckoutOrder) error {
+func triggerOrderCompleted(ctx context.Context, syncedServer *PoolServer, order *CheckoutOrder) error {
 	mutation := &messages.OrderCreated{
 		OrderId: order.ID,
 		Status:  order.Status,
 	}
-	cid, ok := ParseCartId(order.MerchantReference1)
+	cid, ok := cart.ParseCartId(order.MerchantReference1)
 	if !ok {
 		return fmt.Errorf("invalid cart id in order reference: %s", order.MerchantReference1)
 	}
-	_, applyErr := syncedServer.Apply(uint64(cid), mutation)
+	_, applyErr := syncedServer.Apply(ctx, uint64(cid), mutation)
 
 	return applyErr
 }
 
-func confirmOrder(order *CheckoutOrder, orderHandler *AmqpOrderHandler) error {
+func confirmOrder(ctx context.Context, order *CheckoutOrder, orderHandler *AmqpOrderHandler) error {
 	orderToSend, err := json.Marshal(order)
 	if err != nil {
 		return err
 	}
-	err = orderHandler.Connect()
-	if err != nil {
-		return err
-	}
-	defer orderHandler.Close()
+
 	err = orderHandler.OrderCompleted(orderToSend)
 	if err != nil {
 		return err

cmd/cart/openapi.json

@@ -16,7 +16,7 @@
     }
   ],
   "paths": {
-    "/cart/": {
+    "/cart": {
       "get": {
         "summary": "Get (or create) current cart (cookie based)",
         "description": "Returns the current cart. If no cartid cookie is present a new cart is created and Set-Cart-Id response header plus a Set-Cookie header are sent.",
@@ -263,6 +263,76 @@
         }
       }
     },
+    "/cart/voucher": {
+      "put": {
+        "summary": "Add voucher to cart",
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": { "$ref": "#/components/schemas/AddVoucherRequest" }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "Voucher added",
+            "content": {
+              "application/json": {
+                "schema": { "$ref": "#/components/schemas/CartGrain" }
+              }
+            }
+          },
+          "400": { "description": "Invalid body" },
+          "500": { "description": "Server error" }
+        }
+      }
+    },
+    "/cart/subscription-details": {
+      "put": {
+        "summary": "Upsert subscription details",
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": {
+                "$ref": "#/components/schemas/UpsertSubscriptionDetails"
+              }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "Subscription details updated",
+            "content": {
+              "application/json": {
+                "schema": { "$ref": "#/components/schemas/CartGrain" }
+              }
+            }
+          },
+          "400": { "description": "Invalid body" },
+          "500": { "description": "Server error" }
+        }
+      }
+    },
+    "/cart/voucher/{voucherId}": {
+      "delete": {
+        "summary": "Remove voucher from cart",
+        "parameters": [{ "$ref": "#/components/parameters/VoucherIdParam" }],
+        "responses": {
+          "200": {
+            "description": "Voucher removed",
+            "content": {
+              "application/json": {
+                "schema": { "$ref": "#/components/schemas/CartGrain" }
+              }
+            }
+          },
+          "400": { "description": "Invalid id" },
+          "500": { "description": "Server error" }
+        }
+      }
+    },
     "/cart/byid/{id}": {
       "get": {
         "summary": "Get cart by explicit id",
@@ -452,6 +522,53 @@
         }
       }
     },
+    "/cart/byid/{id}/voucher": {
+      "put": {
+        "summary": "Add voucher (by id variant)",
+        "parameters": [{ "$ref": "#/components/parameters/CartIdParam" }],
+        "requestBody": {
+          "required": true,
+          "content": {
+            "application/json": {
+              "schema": { "$ref": "#/components/schemas/AddVoucherRequest" }
+            }
+          }
+        },
+        "responses": {
+          "200": {
+            "description": "Voucher added",
+            "content": {
+              "application/json": {
+                "schema": { "$ref": "#/components/schemas/CartGrain" }
+              }
+            }
+          },
+          "400": { "description": "Invalid body" },
+          "500": { "description": "Server error" }
+        }
+      }
+    },
+    "/cart/byid/{id}/voucher/{voucherId}": {
+      "delete": {
+        "summary": "Remove voucher (by id variant)",
+        "parameters": [
+          { "$ref": "#/components/parameters/CartIdParam" },
+          { "$ref": "#/components/parameters/VoucherIdParam" }
+        ],
+        "responses": {
+          "200": {
+            "description": "Voucher removed",
+            "content": {
+              "application/json": {
+                "schema": { "$ref": "#/components/schemas/CartGrain" }
+              }
+            }
+          },
+          "400": { "description": "Invalid ids" },
+          "500": { "description": "Server error" }
+        }
+      }
+    },
     "/healthz": {
       "get": {
         "summary": "Liveness & capacity probe",
@@ -517,6 +634,12 @@
         "in": "path",
         "required": true,
         "schema": { "type": "integer", "format": "int64", "minimum": 0 }
+      },
+      "VoucherIdParam": {
+        "name": "voucherId",
+        "in": "path",
+        "required": true,
+        "schema": { "type": "integer", "format": "int64", "minimum": 0 }
       }
     },
     "schemas": {
@@ -542,7 +665,17 @@
           "processing": { "type": "boolean" },
           "paymentInProgress": { "type": "boolean" },
           "orderReference": { "type": "string" },
-          "paymentStatus": { "type": "string" }
+          "paymentStatus": { "type": "string" },
+          "vouchers": {
+            "type": "array",
+            "items": { "$ref": "#/components/schemas/Voucher" }
+          },
+          "subscriptionDetails": {
+            "type": "object",
+            "additionalProperties": {
+              "$ref": "#/components/schemas/SubscriptionDetails"
+            }
+          }
         },
         "required": ["id", "items", "totalPrice", "totalTax", "totalDiscount"]
       },
@@ -670,6 +803,48 @@
           "pickupPoint": { "$ref": "#/components/schemas/PickupPoint" }
         },
         "required": ["provider", "items"]
+      },
+      "AddVoucherRequest": {
+        "type": "object",
+        "properties": {
+          "code": { "type": "string" }
+        },
+        "required": ["code"]
+      },
+      "UpsertSubscriptionDetails": {
+        "type": "object",
+        "properties": {
+          "id": { "type": "string" },
+          "offeringCode": { "type": "string" },
+          "signingType": { "type": "string" },
+          "data": { "type": "object" }
+        },
+        "required": ["offeringCode", "signingType"]
+      },
+      "Voucher": {
+        "type": "object",
+        "properties": {
+          "code": { "type": "string" },
+          "applied": { "type": "boolean" },
+          "rules": {
+            "type": "array",
+            "items": { "type": "string" }
+          },
+          "description": { "type": "string" },
+          "id": { "type": "integer", "format": "int64" },
+          "value": { "type": "integer", "format": "int64" }
+        },
+        "required": ["code", "applied", "rules", "id", "value"]
+      },
+      "SubscriptionDetails": {
+        "type": "object",
+        "properties": {
+          "id": { "type": "string" },
+          "offeringCode": { "type": "string" },
+          "signingType": { "type": "string" },
+          "data": { "type": "object" }
+        },
+        "required": ["id"]
       }
     }
   },

cmd/cart/otel.go

@@ -0,0 +1,117 @@
+package main
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/log/global"
+	"go.opentelemetry.io/otel/propagation"
+	"go.opentelemetry.io/otel/sdk/log"
+	"go.opentelemetry.io/otel/sdk/metric"
+	"go.opentelemetry.io/otel/sdk/trace"
+)
+
+// setupOTelSDK bootstraps the OpenTelemetry pipeline.
+// If it does not return an error, make sure to call shutdown for proper cleanup.
+func setupOTelSDK(ctx context.Context) (func(context.Context) error, error) {
+	var shutdownFuncs []func(context.Context) error
+	var err error
+
+	// shutdown calls cleanup functions registered via shutdownFuncs.
+	// The errors from the calls are joined.
+	// Each registered cleanup will be invoked once.
+	shutdown := func(ctx context.Context) error {
+		var err error
+		for _, fn := range shutdownFuncs {
+			err = errors.Join(err, fn(ctx))
+		}
+		shutdownFuncs = nil
+		return err
+	}
+
+	// handleErr calls shutdown for cleanup and makes sure that all errors are returned.
+	handleErr := func(inErr error) {
+		err = errors.Join(inErr, shutdown(ctx))
+	}
+
+	// Set up propagator.
+	prop := newPropagator()
+	otel.SetTextMapPropagator(prop)
+
+	// Set up trace provider.
+	tracerProvider, err := newTracerProvider()
+	if err != nil {
+		handleErr(err)
+		return shutdown, err
+	}
+	shutdownFuncs = append(shutdownFuncs, tracerProvider.Shutdown)
+	otel.SetTracerProvider(tracerProvider)
+
+	// Set up meter provider.
+	meterProvider, err := newMeterProvider()
+	if err != nil {
+		handleErr(err)
+		return shutdown, err
+	}
+	shutdownFuncs = append(shutdownFuncs, meterProvider.Shutdown)
+	otel.SetMeterProvider(meterProvider)
+
+	// Set up logger provider.
+	loggerProvider, err := newLoggerProvider()
+	if err != nil {
+		handleErr(err)
+		return shutdown, err
+	}
+	shutdownFuncs = append(shutdownFuncs, loggerProvider.Shutdown)
+	global.SetLoggerProvider(loggerProvider)
+
+	return shutdown, err
+}
+
+func newPropagator() propagation.TextMapPropagator {
+	return propagation.NewCompositeTextMapPropagator(
+		propagation.TraceContext{},
+		propagation.Baggage{},
+	)
+}
+
+func newTracerProvider() (*trace.TracerProvider, error) {
+	traceExporter, err := otlptracegrpc.New(context.Background())
+	if err != nil {
+		return nil, err
+	}
+
+	tracerProvider := trace.NewTracerProvider(
+		trace.WithBatcher(traceExporter,
+			// Default is 5s. Set to 1s for demonstrative purposes.
+			trace.WithBatchTimeout(time.Second)),
+	)
+	return tracerProvider, nil
+}
+
+func newMeterProvider() (*metric.MeterProvider, error) {
+	exporter, err := otlpmetricgrpc.New(context.Background())
+	if err != nil {
+		return nil, err
+	}
+
+	provider := metric.NewMeterProvider(metric.WithReader(metric.NewPeriodicReader(exporter)))
+	return provider, nil
+}
+
+func newLoggerProvider() (*log.LoggerProvider, error) {
+	logExporter, err := otlploggrpc.New(context.Background())
+	if err != nil {
+		return nil, err
+	}
+
+	loggerProvider := log.NewLoggerProvider(
+		log.WithProcessor(log.NewBatchProcessor(logExporter)),
+	)
+	return loggerProvider, nil
+}

cmd/cart/pool-server.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"fmt"
 	"log"
@@ -11,31 +12,56 @@ import (
 	"time"
 
 	"git.tornberg.me/go-cart-actor/pkg/actor"
+	"git.tornberg.me/go-cart-actor/pkg/cart"
 	messages "git.tornberg.me/go-cart-actor/pkg/messages"
 	"git.tornberg.me/go-cart-actor/pkg/voucher"
+	"git.tornberg.me/mats/go-redis-inventory/pkg/inventory"
 	"github.com/gogo/protobuf/proto"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"go.opentelemetry.io/contrib/bridges/otelslog"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
+	"google.golang.org/protobuf/types/known/anypb"
+
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/trace"
+)
+
+var (
+	grainMutations = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "cart_grain_mutations_total",
+		Help: "The total number of mutations",
+	})
+	grainLookups = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "cart_grain_lookups_total",
+		Help: "The total number of lookups",
+	})
 )
 
 type PoolServer struct {
-	actor.GrainPool[*CartGrain]
-	pod_name     string
-	klarnaClient *KlarnaClient
+	actor.GrainPool[*cart.CartGrain]
+	pod_name         string
+	klarnaClient     *KlarnaClient
+	inventoryService inventory.InventoryService
 }
 
-func NewPoolServer(pool actor.GrainPool[*CartGrain], pod_name string, klarnaClient *KlarnaClient) *PoolServer {
+func NewPoolServer(pool actor.GrainPool[*cart.CartGrain], pod_name string, klarnaClient *KlarnaClient, inventoryService inventory.InventoryService) *PoolServer {
 	return &PoolServer{
-		GrainPool:    pool,
-		pod_name:     pod_name,
-		klarnaClient: klarnaClient,
+		GrainPool:        pool,
+		pod_name:         pod_name,
+		klarnaClient:     klarnaClient,
+		inventoryService: inventoryService,
 	}
 }
 
-func (s *PoolServer) ApplyLocal(id CartId, mutation ...proto.Message) (*actor.MutationResult[*CartGrain], error) {
-	return s.Apply(uint64(id), mutation...)
+func (s *PoolServer) ApplyLocal(ctx context.Context, id cart.CartId, mutation ...proto.Message) (*actor.MutationResult[*cart.CartGrain], error) {
+	return s.Apply(ctx, uint64(id), mutation...)
 }
 
-func (s *PoolServer) GetCartHandler(w http.ResponseWriter, r *http.Request, id CartId) error {
-	grain, err := s.Get(uint64(id))
+func (s *PoolServer) GetCartHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
+	grain, err := s.Get(r.Context(), uint64(id))
 	if err != nil {
 		return err
 	}
@@ -43,16 +69,17 @@ func (s *PoolServer) GetCartHandler(w http.ResponseWriter, r *http.Request, id C
 	return s.WriteResult(w, grain)
 }
 
-func (s *PoolServer) AddSkuToCartHandler(w http.ResponseWriter, r *http.Request, id CartId) error {
+func (s *PoolServer) AddSkuToCartHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
 	sku := r.PathValue("sku")
-	msg, err := GetItemAddMessage(sku, 1, getCountryFromHost(r.Host), nil)
+	msg, err := GetItemAddMessage(r.Context(), sku, 1, getCountryFromHost(r.Host), nil)
 	if err != nil {
 		return err
 	}
-	data, err := s.ApplyLocal(id, msg)
+	data, err := s.ApplyLocal(r.Context(), id, msg)
 	if err != nil {
 		return err
 	}
+	grainMutations.Add(float64(len(data.Mutations)))
 	return s.WriteResult(w, data)
 }
 
@@ -73,14 +100,14 @@ func (s *PoolServer) WriteResult(w http.ResponseWriter, result any) error {
 	return err
 }
 
-func (s *PoolServer) DeleteItemHandler(w http.ResponseWriter, r *http.Request, id CartId) error {
+func (s *PoolServer) DeleteItemHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
 
 	itemIdString := r.PathValue("itemId")
 	itemId, err := strconv.ParseInt(itemIdString, 10, 64)
 	if err != nil {
 		return err
 	}
-	data, err := s.ApplyLocal(id, &messages.RemoveItem{Id: uint32(itemId)})
+	data, err := s.ApplyLocal(r.Context(), id, &messages.RemoveItem{Id: uint32(itemId)})
 	if err != nil {
 		return err
 	}
@@ -93,14 +120,14 @@ type SetDeliveryRequest struct {
 	PickupPoint *messages.PickupPoint `json:"pickupPoint,omitempty"`
 }
 
-func (s *PoolServer) SetDeliveryHandler(w http.ResponseWriter, r *http.Request, id CartId) error {
+func (s *PoolServer) SetDeliveryHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
 
 	delivery := SetDeliveryRequest{}
 	err := json.NewDecoder(r.Body).Decode(&delivery)
 	if err != nil {
 		return err
 	}
-	data, err := s.ApplyLocal(id, &messages.SetDelivery{
+	data, err := s.ApplyLocal(r.Context(), id, &messages.SetDelivery{
 		Provider:    delivery.Provider,
 		Items:       delivery.Items,
 		PickupPoint: delivery.PickupPoint,
@@ -111,7 +138,7 @@ func (s *PoolServer) SetDeliveryHandler(w http.ResponseWriter, r *http.Request,
 	return s.WriteResult(w, data)
 }
 
-func (s *PoolServer) SetPickupPointHandler(w http.ResponseWriter, r *http.Request, id CartId) error {
+func (s *PoolServer) SetPickupPointHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
 
 	deliveryIdString := r.PathValue("deliveryId")
 	deliveryId, err := strconv.ParseInt(deliveryIdString, 10, 64)
@@ -123,7 +150,7 @@ func (s *PoolServer) SetPickupPointHandler(w http.ResponseWriter, r *http.Reques
 	if err != nil {
 		return err
 	}
-	reply, err := s.ApplyLocal(id, &messages.SetPickupPoint{
+	reply, err := s.ApplyLocal(r.Context(), id, &messages.SetPickupPoint{
 		DeliveryId: uint32(deliveryId),
 		Id:         pickupPoint.Id,
 		Name:       pickupPoint.Name,
@@ -138,27 +165,27 @@ func (s *PoolServer) SetPickupPointHandler(w http.ResponseWriter, r *http.Reques
 	return s.WriteResult(w, reply)
 }
 
-func (s *PoolServer) RemoveDeliveryHandler(w http.ResponseWriter, r *http.Request, id CartId) error {
+func (s *PoolServer) RemoveDeliveryHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
 
 	deliveryIdString := r.PathValue("deliveryId")
 	deliveryId, err := strconv.Atoi(deliveryIdString)
 	if err != nil {
 		return err
 	}
-	reply, err := s.ApplyLocal(id, &messages.RemoveDelivery{Id: uint32(deliveryId)})
+	reply, err := s.ApplyLocal(r.Context(), id, &messages.RemoveDelivery{Id: uint32(deliveryId)})
 	if err != nil {
 		return err
 	}
 	return s.WriteResult(w, reply)
 }
 
-func (s *PoolServer) QuantityChangeHandler(w http.ResponseWriter, r *http.Request, id CartId) error {
+func (s *PoolServer) QuantityChangeHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
 	changeQuantity := messages.ChangeQuantity{}
 	err := json.NewDecoder(r.Body).Decode(&changeQuantity)
 	if err != nil {
 		return err
 	}
-	reply, err := s.ApplyLocal(id, &changeQuantity)
+	reply, err := s.ApplyLocal(r.Context(), id, &changeQuantity)
 	if err != nil {
 		return err
 	}
@@ -176,14 +203,14 @@ type SetCartItems struct {
 	Items   []Item `json:"items"`
 }
 
-func getMultipleAddMessages(items []Item, country string) []proto.Message {
+func getMultipleAddMessages(ctx context.Context, items []Item, country string) []proto.Message {
 	wg := sync.WaitGroup{}
 	mu := sync.Mutex{}
 	msgs := make([]proto.Message, 0, len(items))
 	for _, itm := range items {
 		wg.Go(
 			func() {
-				msg, err := GetItemAddMessage(itm.Sku, itm.Quantity, country, itm.StoreId)
+				msg, err := GetItemAddMessage(ctx, itm.Sku, itm.Quantity, country, itm.StoreId)
 				if err != nil {
 					log.Printf("error adding item %s: %v", itm.Sku, err)
 					return
@@ -197,7 +224,7 @@ func getMultipleAddMessages(items []Item, country string) []proto.Message {
 	return msgs
 }
 
-func (s *PoolServer) SetCartItemsHandler(w http.ResponseWriter, r *http.Request, id CartId) error {
+func (s *PoolServer) SetCartItemsHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
 	setCartItems := SetCartItems{}
 	err := json.NewDecoder(r.Body).Decode(&setCartItems)
 	if err != nil {
@@ -206,23 +233,23 @@ func (s *PoolServer) SetCartItemsHandler(w http.ResponseWriter, r *http.Request,
 
 	msgs := make([]proto.Message, 0, len(setCartItems.Items)+1)
 	msgs = append(msgs, &messages.ClearCartRequest{})
-	msgs = append(msgs, getMultipleAddMessages(setCartItems.Items, setCartItems.Country)...)
+	msgs = append(msgs, getMultipleAddMessages(r.Context(), setCartItems.Items, setCartItems.Country)...)
 
-	reply, err := s.ApplyLocal(id, msgs...)
+	reply, err := s.ApplyLocal(r.Context(), id, msgs...)
 	if err != nil {
 		return err
 	}
 	return s.WriteResult(w, reply)
 }
 
-func (s *PoolServer) AddMultipleItemHandler(w http.ResponseWriter, r *http.Request, id CartId) error {
+func (s *PoolServer) AddMultipleItemHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
 	setCartItems := SetCartItems{}
 	err := json.NewDecoder(r.Body).Decode(&setCartItems)
 	if err != nil {
 		return err
 	}
 
-	reply, err := s.ApplyLocal(id, getMultipleAddMessages(setCartItems.Items, setCartItems.Country)...)
+	reply, err := s.ApplyLocal(r.Context(), id, getMultipleAddMessages(r.Context(), setCartItems.Items, setCartItems.Country)...)
 	if err != nil {
 		return err
 	}
@@ -236,17 +263,17 @@ type AddRequest struct {
 	StoreId  *string `json:"storeId"`
 }
 
-func (s *PoolServer) AddSkuRequestHandler(w http.ResponseWriter, r *http.Request, id CartId) error {
+func (s *PoolServer) AddSkuRequestHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
 	addRequest := AddRequest{Quantity: 1}
 	err := json.NewDecoder(r.Body).Decode(&addRequest)
 	if err != nil {
 		return err
 	}
-	msg, err := GetItemAddMessage(addRequest.Sku, int(addRequest.Quantity), addRequest.Country, addRequest.StoreId)
+	msg, err := GetItemAddMessage(r.Context(), addRequest.Sku, int(addRequest.Quantity), addRequest.Country, addRequest.StoreId)
 	if err != nil {
 		return err
 	}
-	reply, err := s.ApplyLocal(id, msg)
+	reply, err := s.ApplyLocal(r.Context(), id, msg)
 	if err != nil {
 		return err
 	}
@@ -287,24 +314,61 @@ func getLocale(country string) string {
 	return "sv-se"
 }
 
-func (s *PoolServer) CreateOrUpdateCheckout(host string, id CartId) (*CheckoutOrder, error) {
+func getLocationId(item *cart.CartItem) inventory.LocationID {
+	if item.StoreId == nil || *item.StoreId == "" {
+		return "se"
+	}
+	return inventory.LocationID(*item.StoreId)
+}
+
+func getInventoryRequests(items []*cart.CartItem) []inventory.ReserveRequest {
+	var requests []inventory.ReserveRequest
+	for _, item := range items {
+		if item == nil {
+			continue
+		}
+		requests = append(requests, inventory.ReserveRequest{
+			SKU:        inventory.SKU(item.Sku),
+			LocationID: getLocationId(item),
+			Quantity:   uint32(item.Quantity),
+		})
+	}
+	return requests
+}
+
+func getOriginalHost(r *http.Request) string {
+	proxyHost := r.Header.Get("X-Forwarded-Host")
+	if proxyHost != "" {
+		return proxyHost
+	}
+	return r.Host
+}
+
+func (s *PoolServer) CreateOrUpdateCheckout(r *http.Request, id cart.CartId) (*CheckoutOrder, error) {
+	host := getOriginalHost(r)
 	country := getCountryFromHost(host)
 	meta := &CheckoutMeta{
 		Terms:        fmt.Sprintf("https://%s/terms", host),
 		Checkout:     fmt.Sprintf("https://%s/checkout?order_id={checkout.order.id}", host),
 		Confirmation: fmt.Sprintf("https://%s/confirmation/{checkout.order.id}", host),
-		Validation:   fmt.Sprintf("https://%s/validate", host),
-		Push:         fmt.Sprintf("https://%s/push?order_id={checkout.order.id}", host),
 		Country:      country,
 		Currency:     getCurrency(country),
 		Locale:       getLocale(country),
 	}
 
 	// Get current grain state (may be local or remote)
-	grain, err := s.Get(uint64(id))
+	grain, err := s.Get(r.Context(), uint64(id))
 	if err != nil {
 		return nil, err
 	}
+	if s.inventoryService != nil {
+		inventoryRequests := getInventoryRequests(grain.Items)
+		failingRequest, err := s.inventoryService.ReservationCheck(r.Context(), inventoryRequests...)
+		if err != nil {
+			logger.WarnContext(r.Context(), "inventory check failed", string(failingRequest.SKU), string(failingRequest.LocationID))
+			return nil, err
+		}
+	}
 
 	// Build pure checkout payload
 	payload, _, err := BuildCheckoutOrderPayload(grain, meta)
@@ -313,15 +377,15 @@ func (s *PoolServer) CreateOrUpdateCheckout(host string, id CartId) (*CheckoutOr
 	}
 
 	if grain.OrderReference != "" {
-		return s.klarnaClient.UpdateOrder(grain.OrderReference, bytes.NewReader(payload))
+		return s.klarnaClient.UpdateOrder(r.Context(), grain.OrderReference, bytes.NewReader(payload))
 	} else {
-		return s.klarnaClient.CreateOrder(bytes.NewReader(payload))
+		return s.klarnaClient.CreateOrder(r.Context(), bytes.NewReader(payload))
 	}
 }
 
-func (s *PoolServer) ApplyCheckoutStarted(klarnaOrder *CheckoutOrder, id CartId) (*actor.MutationResult[*CartGrain], error) {
+func (s *PoolServer) ApplyCheckoutStarted(ctx context.Context, klarnaOrder *CheckoutOrder, id cart.CartId) (*actor.MutationResult[*cart.CartGrain], error) {
 	// Persist initialization state via mutation (best-effort)
-	return s.ApplyLocal(id, &messages.InitializeCheckout{
+	return s.ApplyLocal(ctx, id, &messages.InitializeCheckout{
 		OrderId:           klarnaOrder.ID,
 		Status:            klarnaOrder.Status,
 		PaymentInProgress: true,
@@ -341,12 +405,12 @@ func (s *PoolServer) ApplyCheckoutStarted(klarnaOrder *CheckoutOrder, id CartId)
 // }
 //
 
-func CookieCartIdHandler(fn func(cartId CartId, w http.ResponseWriter, r *http.Request) error) func(w http.ResponseWriter, r *http.Request) {
+func CookieCartIdHandler(fn func(cartId cart.CartId, w http.ResponseWriter, r *http.Request) error) func(w http.ResponseWriter, r *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
-		var id CartId
+		var id cart.CartId
 		cookie, err := r.Cookie("cartid")
 		if err != nil || cookie.Value == "" {
-			id = MustNewCartId()
+			id = cart.MustNewCartId()
 			http.SetCookie(w, &http.Cookie{
 				Name:     "cartid",
 				Value:    id.String(),
@@ -358,9 +422,9 @@ func CookieCartIdHandler(fn func(cartId CartId, w http.ResponseWriter, r *http.R
 			})
 			w.Header().Set("Set-Cart-Id", id.String())
 		} else {
-			parsed, ok := ParseCartId(cookie.Value)
+			parsed, ok := cart.ParseCartId(cookie.Value)
 			if !ok {
-				id = MustNewCartId()
+				id = cart.MustNewCartId()
 				http.SetCookie(w, &http.Cookie{
 					Name:     "cartid",
 					Value:    id.String(),
@@ -388,7 +452,7 @@ func CookieCartIdHandler(fn func(cartId CartId, w http.ResponseWriter, r *http.R
 
 // Removed leftover legacy block after CookieCartIdHandler (obsolete code referencing cid/legacy)
 
-func (s *PoolServer) RemoveCartCookie(w http.ResponseWriter, r *http.Request, cartId CartId) error {
+func (s *PoolServer) RemoveCartCookie(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error {
 	// Clear cart cookie (breaking change: do not issue a new legacy id here)
 	http.SetCookie(w, &http.Cookie{
 		Name:     "cartid",
@@ -403,17 +467,17 @@ func (s *PoolServer) RemoveCartCookie(w http.ResponseWriter, r *http.Request, ca
 	return nil
 }
 
-func CartIdHandler(fn func(cartId CartId, w http.ResponseWriter, r *http.Request) error) func(w http.ResponseWriter, r *http.Request) {
+func CartIdHandler(fn func(cartId cart.CartId, w http.ResponseWriter, r *http.Request) error) func(w http.ResponseWriter, r *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
-		var id CartId
+		var id cart.CartId
 		raw := r.PathValue("id")
 		// If no id supplied, generate a new one
 		if raw == "" {
-			id := MustNewCartId()
+			id := cart.MustNewCartId()
 			w.Header().Set("Set-Cart-Id", id.String())
 		} else {
 			// Parse base62 cart id
-			if parsedId, ok := ParseCartId(raw); !ok {
+			if parsedId, ok := cart.ParseCartId(raw); !ok {
 				w.WriteHeader(http.StatusBadRequest)
 				w.Write([]byte("cart id is invalid"))
 				return
@@ -431,35 +495,71 @@ func CartIdHandler(fn func(cartId CartId, w http.ResponseWriter, r *http.Request
 	}
 }
 
-func (s *PoolServer) ProxyHandler(fn func(w http.ResponseWriter, r *http.Request, cartId CartId) error) func(cartId CartId, w http.ResponseWriter, r *http.Request) error {
-	return func(cartId CartId, w http.ResponseWriter, r *http.Request) error {
+func (s *PoolServer) ProxyHandler(fn func(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error) func(cartId cart.CartId, w http.ResponseWriter, r *http.Request) error {
+	return func(cartId cart.CartId, w http.ResponseWriter, r *http.Request) error {
 		if ownerHost, ok := s.OwnerHost(uint64(cartId)); ok {
+			ctx, span := tracer.Start(r.Context(), "proxy")
+			defer span.End()
+			span.SetAttributes(attribute.String("cartid", cartId.String()))
+			hostAttr := attribute.String("other host", ownerHost.Name())
+			span.SetAttributes(hostAttr)
+			logger.InfoContext(ctx, "cart proxyed", "result", ownerHost.Name())
+			proxyCalls.Add(ctx, 1, metric.WithAttributes(hostAttr))
 			handled, err := ownerHost.Proxy(uint64(cartId), w, r)
+
+			grainLookups.Inc()
 			if err == nil && handled {
 				return nil
 			}
 		}
-
+		_, span := tracer.Start(r.Context(), "own")
+		span.SetAttributes(attribute.String("cartid", cartId.String()))
+		defer span.End()
 		return fn(w, r, cartId)
 
 	}
 }
 
+var (
+	tracer = otel.Tracer(name)
+
+	meter      = otel.Meter(name)
+	logger     = otelslog.NewLogger(name)
+	proxyCalls metric.Int64Counter
+
+// rollCnt metric.Int64Counter
+)
+
+func init() {
+	var err error
+	proxyCalls, err = meter.Int64Counter("proxy.calls",
+		metric.WithDescription("Number of proxy calls"),
+		metric.WithUnit("{calls}"))
+	if err != nil {
+		panic(err)
+	}
+
+}
+
 type AddVoucherRequest struct {
 	VoucherCode string `json:"code"`
 }
 
-func (s *PoolServer) AddVoucherHandler(w http.ResponseWriter, r *http.Request, cartId CartId) error {
+func (s *PoolServer) AddVoucherHandler(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error {
 	data := &AddVoucherRequest{}
 	json.NewDecoder(r.Body).Decode(data)
 	v := voucher.Service{}
 	msg, err := v.GetVoucher(data.VoucherCode)
 	if err != nil {
+		s.ApplyLocal(r.Context(), cartId, &messages.PreConditionFailed{
+			Operation: "AddVoucher",
+			Error:     err.Error(),
+		})
 		w.WriteHeader(http.StatusInternalServerError)
 		w.Write([]byte(err.Error()))
 		return err
 	}
-	reply, err := s.ApplyLocal(cartId, msg)
+	reply, err := s.ApplyLocal(r.Context(), cartId, msg)
 	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
 		w.Write([]byte(err.Error()))
@@ -469,7 +569,61 @@ func (s *PoolServer) AddVoucherHandler(w http.ResponseWriter, r *http.Request, c
 	return nil
 }
 
-func (s *PoolServer) RemoveVoucherHandler(w http.ResponseWriter, r *http.Request, cartId CartId) error {
+type SubscriptionDetailsRequest struct {
+	Id           *string         `json:"id,omitempty"`
+	OfferingCode string          `json:"offeringCode,omitempty"`
+	SigningType  string          `json:"signingType,omitempty"`
+	Data         json.RawMessage `json:"data,omitempty"`
+}
+
+func (sd *SubscriptionDetailsRequest) ToMessage() *messages.UpsertSubscriptionDetails {
+	return &messages.UpsertSubscriptionDetails{
+		Id:           sd.Id,
+		OfferingCode: sd.OfferingCode,
+		SigningType:  sd.SigningType,
+		Data:         &anypb.Any{Value: sd.Data},
+	}
+}
+
+func (s *PoolServer) SubscriptionDetailsHandler(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error {
+	data := &SubscriptionDetailsRequest{}
+	err := json.NewDecoder(r.Body).Decode(data)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte(err.Error()))
+		return err
+	}
+	reply, err := s.ApplyLocal(r.Context(), cartId, data.ToMessage())
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte(err.Error()))
+		return err
+	}
+	s.WriteResult(w, reply)
+	return nil
+}
+
+func (s *PoolServer) CheckoutHandler(fn func(order *CheckoutOrder, w http.ResponseWriter) error) func(w http.ResponseWriter, r *http.Request) {
+	return CookieCartIdHandler(s.ProxyHandler(func(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error {
+		orderId := r.URL.Query().Get("order_id")
+		if orderId == "" {
+			order, err := s.CreateOrUpdateCheckout(r, cartId)
+			if err != nil {
+				logger.Error("unable to create klarna session", "error", err)
+				return err
+			}
+			s.ApplyCheckoutStarted(r.Context(), order, cartId)
+			return fn(order, w)
+		}
+		order, err := s.klarnaClient.GetOrder(r.Context(), orderId)
+		if err != nil {
+			return err
+		}
+		return fn(order, w)
+	}))
+}
+
+func (s *PoolServer) RemoveVoucherHandler(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error {
 
 	idStr := r.PathValue("voucherId")
 	id, err := strconv.ParseInt(idStr, 10, 64)
@@ -478,7 +632,7 @@ func (s *PoolServer) RemoveVoucherHandler(w http.ResponseWriter, r *http.Request
 		w.Write([]byte(err.Error()))
 		return err
 	}
-	reply, err := s.ApplyLocal(cartId, &messages.RemoveVoucher{Id: uint32(id)})
+	reply, err := s.ApplyLocal(r.Context(), cartId, &messages.RemoveVoucher{Id: uint32(id)})
 	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
 		w.Write([]byte(err.Error()))
@@ -488,45 +642,58 @@ func (s *PoolServer) RemoveVoucherHandler(w http.ResponseWriter, r *http.Request
 	return nil
 }
 
-func (s *PoolServer) Serve() *http.ServeMux {
+func (s *PoolServer) Serve(mux *http.ServeMux) {
 
-	mux := http.NewServeMux()
-	mux.HandleFunc("OPTIONS /", func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Set("Access-Control-Allow-Origin", "*")
-		w.Header().Set("Access-Control-Allow-Methods", "GET, PUT, POST, DELETE")
-		w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
-		w.WriteHeader(http.StatusOK)
-	})
+	// mux.HandleFunc("OPTIONS /cart", func(w http.ResponseWriter, r *http.Request) {
+	// 	w.Header().Set("Access-Control-Allow-Origin", "*")
+	// 	w.Header().Set("Access-Control-Allow-Methods", "GET, PUT, POST, DELETE")
+	// 	w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
+	// 	w.WriteHeader(http.StatusOK)
+	// })
 
-	mux.HandleFunc("GET /", CookieCartIdHandler(s.ProxyHandler(s.GetCartHandler)))
-	mux.HandleFunc("GET /add/{sku}", CookieCartIdHandler(s.ProxyHandler(s.AddSkuToCartHandler)))
-	mux.HandleFunc("POST /add", CookieCartIdHandler(s.ProxyHandler(s.AddMultipleItemHandler)))
-	mux.HandleFunc("POST /", CookieCartIdHandler(s.ProxyHandler(s.AddSkuRequestHandler)))
-	mux.HandleFunc("POST /set", CookieCartIdHandler(s.ProxyHandler(s.SetCartItemsHandler)))
-	mux.HandleFunc("DELETE /{itemId}", CookieCartIdHandler(s.ProxyHandler(s.DeleteItemHandler)))
-	mux.HandleFunc("PUT /", CookieCartIdHandler(s.ProxyHandler(s.QuantityChangeHandler)))
-	mux.HandleFunc("DELETE /", CookieCartIdHandler(s.ProxyHandler(s.RemoveCartCookie)))
-	mux.HandleFunc("POST /delivery", CookieCartIdHandler(s.ProxyHandler(s.SetDeliveryHandler)))
-	mux.HandleFunc("DELETE /delivery/{deliveryId}", CookieCartIdHandler(s.ProxyHandler(s.RemoveDeliveryHandler)))
-	mux.HandleFunc("PUT /delivery/{deliveryId}/pickupPoint", CookieCartIdHandler(s.ProxyHandler(s.SetPickupPointHandler)))
-	mux.HandleFunc("PUT /voucher", CookieCartIdHandler(s.ProxyHandler(s.AddVoucherHandler)))
-	mux.HandleFunc("DELETE /voucher/{voucherId}", CookieCartIdHandler(s.ProxyHandler(s.RemoveVoucherHandler)))
+	handleFunc := func(pattern string, handlerFunc func(http.ResponseWriter, *http.Request)) {
+		attr := attribute.String("http.route", pattern)
+		mux.HandleFunc(pattern, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			span := trace.SpanFromContext(r.Context())
+			span.SetName(pattern)
+			span.SetAttributes(attr)
 
-	//mux.HandleFunc("GET /checkout", CookieCartIdHandler(s.ProxyHandler(s.HandleCheckout)))
-	//mux.HandleFunc("GET /confirmation/{orderId}", CookieCartIdHandler(s.ProxyHandler(s.HandleConfirmation)))
+			labeler, _ := otelhttp.LabelerFromContext(r.Context())
+			labeler.Add(attr)
 
-	mux.HandleFunc("GET /byid/{id}", CartIdHandler(s.ProxyHandler(s.GetCartHandler)))
-	mux.HandleFunc("GET /byid/{id}/add/{sku}", CartIdHandler(s.ProxyHandler(s.AddSkuToCartHandler)))
-	mux.HandleFunc("POST /byid/{id}", CartIdHandler(s.ProxyHandler(s.AddSkuRequestHandler)))
-	mux.HandleFunc("DELETE /byid/{id}/{itemId}", CartIdHandler(s.ProxyHandler(s.DeleteItemHandler)))
-	mux.HandleFunc("PUT /byid/{id}", CartIdHandler(s.ProxyHandler(s.QuantityChangeHandler)))
-	mux.HandleFunc("POST /byid/{id}/delivery", CartIdHandler(s.ProxyHandler(s.SetDeliveryHandler)))
-	mux.HandleFunc("DELETE /byid/{id}/delivery/{deliveryId}", CartIdHandler(s.ProxyHandler(s.RemoveDeliveryHandler)))
-	mux.HandleFunc("PUT /byid/{id}/delivery/{deliveryId}/pickupPoint", CartIdHandler(s.ProxyHandler(s.SetPickupPointHandler)))
-	mux.HandleFunc("PUT /byid/{id}/voucher", CookieCartIdHandler(s.ProxyHandler(s.AddVoucherHandler)))
-	mux.HandleFunc("DELETE /byid/{id}/voucher/{voucherId}", CookieCartIdHandler(s.ProxyHandler(s.RemoveVoucherHandler)))
-	//mux.HandleFunc("GET /byid/{id}/checkout", CartIdHandler(s.ProxyHandler(s.HandleCheckout)))
-	//mux.HandleFunc("GET /byid/{id}/confirmation", CartIdHandler(s.ProxyHandler(s.HandleConfirmation)))
+			handlerFunc(w, r)
+		}))
+	}
+
+	handleFunc("GET /cart", CookieCartIdHandler(s.ProxyHandler(s.GetCartHandler)))
+	handleFunc("GET /cart/add/{sku}", CookieCartIdHandler(s.ProxyHandler(s.AddSkuToCartHandler)))
+	handleFunc("POST /cart/add", CookieCartIdHandler(s.ProxyHandler(s.AddMultipleItemHandler)))
+	handleFunc("POST /cart", CookieCartIdHandler(s.ProxyHandler(s.AddSkuRequestHandler)))
+	handleFunc("POST /cart/set", CookieCartIdHandler(s.ProxyHandler(s.SetCartItemsHandler)))
+	handleFunc("DELETE /cart/{itemId}", CookieCartIdHandler(s.ProxyHandler(s.DeleteItemHandler)))
+	handleFunc("PUT /cart", CookieCartIdHandler(s.ProxyHandler(s.QuantityChangeHandler)))
+	handleFunc("DELETE /cart", CookieCartIdHandler(s.ProxyHandler(s.RemoveCartCookie)))
+	handleFunc("POST /cart/delivery", CookieCartIdHandler(s.ProxyHandler(s.SetDeliveryHandler)))
+	handleFunc("DELETE /cart/delivery/{deliveryId}", CookieCartIdHandler(s.ProxyHandler(s.RemoveDeliveryHandler)))
+	handleFunc("PUT /cart/delivery/{deliveryId}/pickupPoint", CookieCartIdHandler(s.ProxyHandler(s.SetPickupPointHandler)))
+	handleFunc("PUT /cart/voucher", CookieCartIdHandler(s.ProxyHandler(s.AddVoucherHandler)))
+	handleFunc("PUT /cart/subscription-details", CookieCartIdHandler(s.ProxyHandler(s.SubscriptionDetailsHandler)))
+	handleFunc("DELETE /cart/voucher/{voucherId}", CookieCartIdHandler(s.ProxyHandler(s.RemoveVoucherHandler)))
+
+	//mux.HandleFunc("GET /cart/checkout", CookieCartIdHandler(s.ProxyHandler(s.HandleCheckout)))
+	//mux.HandleFunc("GET /cart/confirmation/{orderId}", CookieCartIdHandler(s.ProxyHandler(s.HandleConfirmation)))
+
+	handleFunc("GET /cart/byid/{id}", CartIdHandler(s.ProxyHandler(s.GetCartHandler)))
+	handleFunc("GET /cart/byid/{id}/add/{sku}", CartIdHandler(s.ProxyHandler(s.AddSkuToCartHandler)))
+	handleFunc("POST /cart/byid/{id}", CartIdHandler(s.ProxyHandler(s.AddSkuRequestHandler)))
+	handleFunc("DELETE /cart/byid/{id}/{itemId}", CartIdHandler(s.ProxyHandler(s.DeleteItemHandler)))
+	handleFunc("PUT /cart/byid/{id}", CartIdHandler(s.ProxyHandler(s.QuantityChangeHandler)))
+	handleFunc("POST /cart/byid/{id}/delivery", CartIdHandler(s.ProxyHandler(s.SetDeliveryHandler)))
+	handleFunc("DELETE /cart/byid/{id}/delivery/{deliveryId}", CartIdHandler(s.ProxyHandler(s.RemoveDeliveryHandler)))
+	handleFunc("PUT /cart/byid/{id}/delivery/{deliveryId}/pickupPoint", CartIdHandler(s.ProxyHandler(s.SetPickupPointHandler)))
+	handleFunc("PUT /cart/byid/{id}/voucher", CookieCartIdHandler(s.ProxyHandler(s.AddVoucherHandler)))
+	handleFunc("DELETE /cart/byid/{id}/voucher/{voucherId}", CookieCartIdHandler(s.ProxyHandler(s.RemoveVoucherHandler)))
+	//mux.HandleFunc("GET /cart/byid/{id}/checkout", CartIdHandler(s.ProxyHandler(s.HandleCheckout)))
+	//mux.HandleFunc("GET /cart/byid/{id}/confirmation", CartIdHandler(s.ProxyHandler(s.HandleConfirmation)))
 
-	return mux
 }

cmd/cart/product-fetcher.go

@@ -1,12 +1,12 @@
 package main
 
 import (
+	"context"
 	"encoding/json"
 	"fmt"
 	"net/http"
-	"strconv"
-	"strings"
 
+	"git.tornberg.me/go-cart-actor/pkg/cart"
 	messages "git.tornberg.me/go-cart-actor/pkg/messages"
 	"github.com/matst80/slask-finder/pkg/index"
 )
@@ -25,9 +25,16 @@ func getBaseUrl(country string) string {
 	return "http://localhost:8082"
 }
 
-func FetchItem(sku string, country string) (*index.DataItem, error) {
+func FetchItem(ctx context.Context, sku string, country string) (*index.DataItem, error) {
 	baseUrl := getBaseUrl(country)
-	res, err := http.Get(fmt.Sprintf("%s/api/by-sku/%s", baseUrl, sku))
+	req, err := http.NewRequest("GET", fmt.Sprintf("%s/api/by-sku/%s", baseUrl, sku), nil)
+	innerCtx, span := tracer.Start(ctx, fmt.Sprintf("fetching data for %s", sku))
+	defer span.End()
+	req = req.WithContext(innerCtx)
+	if err != nil {
+		return nil, err
+	}
+	res, err := http.DefaultClient.Do(req)
 	if err != nil {
 		return nil, err
 	}
@@ -37,36 +44,46 @@ func FetchItem(sku string, country string) (*index.DataItem, error) {
 	return &item, err
 }
 
-func GetItemAddMessage(sku string, qty int, country string, storeId *string) (*messages.AddItem, error) {
-	item, err := FetchItem(sku, country)
+func GetItemAddMessage(ctx context.Context, sku string, qty int, country string, storeId *string) (*messages.AddItem, error) {
+	item, err := FetchItem(ctx, sku, country)
 	if err != nil {
 		return nil, err
 	}
-	return ToItemAddMessage(item, storeId, qty, country), nil
+	return ToItemAddMessage(item, storeId, qty, country)
 }
 
-func ToItemAddMessage(item *index.DataItem, storeId *string, qty int, country string) *messages.AddItem {
+func ToItemAddMessage(item *index.DataItem, storeId *string, qty int, country string) (*messages.AddItem, error) {
 	orgPrice, _ := getInt(item.GetNumberFieldValue(5)) // getInt(item.Fields[5])
 
 	price, err := getInt(item.GetNumberFieldValue(4)) //Fields[4]
 	if err != nil {
-		return nil
+		return nil, err
 	}
+	stk := item.GetStock()
+	stock := cart.StockStatus(0)
 
-	stock := StockStatus(0)
-	centralStockValue, ok := item.GetStringFieldValue(3)
 	if storeId == nil {
+		centralStock, ok := stk[country]
 		if ok {
-			pureNumber := strings.Replace(centralStockValue, "+", "", -1)
-			if centralStock, err := strconv.ParseInt(pureNumber, 10, 64); err == nil {
-				stock = StockStatus(centralStock)
+			if !item.Buyable {
+				return nil, fmt.Errorf("item not available")
 			}
+
+			if centralStock == 0 && item.SaleStatus == "TBD" {
+				return nil, fmt.Errorf("no items available")
+			}
+			stock = cart.StockStatus(centralStock)
 		}
+
 	} else {
-		storeStock, ok := item.Stock.GetStock()[*storeId]
-		if ok {
-			stock = StockStatus(storeStock)
+		if !item.BuyableInStore {
+			return nil, fmt.Errorf("item not available in store")
 		}
+		storeStock, ok := stk[*storeId]
+		if ok {
+			stock = cart.StockStatus(storeStock)
+		}
+
 	}
 
 	articleType, _ := item.GetStringFieldValue(1)   //.Fields[1].(string)
@@ -108,7 +125,8 @@ func ToItemAddMessage(item *index.DataItem, storeId *string, qty int, country st
 		Country:     country,
 		Outlet:      outlet,
 		StoreId:     storeId,
-	}
+		SaleStatus:  item.SaleStatus,
+	}, nil
 }
 
 func getTax(articleType string) int32 {
@@ -119,3 +137,10 @@ func getTax(articleType string) int32 {
 		return 2500
 	}
 }
+
+func getInt(data float64, ok bool) (int, error) {
+	if !ok {
+		return 0, fmt.Errorf("invalid type")
+	}
+	return int(data), nil
+}

cmd/inventory/main.go

@@ -0,0 +1,143 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+	"sync"
+
+	"git.tornberg.me/mats/go-redis-inventory/pkg/inventory"
+	"github.com/matst80/slask-finder/pkg/index"
+	"github.com/matst80/slask-finder/pkg/messaging"
+	"github.com/redis/go-redis/v9"
+	"github.com/redis/go-redis/v9/maintnotifications"
+
+	amqp "github.com/rabbitmq/amqp091-go"
+)
+
+type Server struct {
+	service *inventory.RedisInventoryService
+}
+
+func (srv *Server) livezHandler(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte("OK"))
+}
+
+func (srv *Server) readyzHandler(w http.ResponseWriter, r *http.Request) {
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte("OK"))
+}
+
+func (srv *Server) getInventoryHandler(w http.ResponseWriter, r *http.Request) {
+	// Parse path: /inventory/{sku}/{location}
+	path := r.URL.Path
+	parts := strings.Split(strings.Trim(path, "/"), "/")
+	if len(parts) != 3 || parts[0] != "inventory" {
+		http.Error(w, "Invalid path", http.StatusBadRequest)
+		return
+	}
+	sku := inventory.SKU(parts[1])
+	locationID := inventory.LocationID(parts[2])
+
+	quantity, err := srv.service.GetInventory(r.Context(), sku, locationID)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	response := map[string]int64{"quantity": quantity}
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(response)
+}
+
+var country = "se"
+var redisAddress = "10.10.3.18:6379"
+var redisPassword = "slaskredis"
+
+func init() {
+	// Override redis config from environment variables if set
+	if addr, ok := os.LookupEnv("REDIS_ADDRESS"); ok {
+		redisAddress = addr
+	}
+	if password, ok := os.LookupEnv("REDIS_PASSWORD"); ok {
+		redisPassword = password
+	}
+	if ctry, ok := os.LookupEnv("COUNTRY"); ok {
+		country = ctry
+	}
+}
+
+func main() {
+	var ctx = context.Background()
+	rdb := redis.NewClient(&redis.Options{
+		Addr:     redisAddress,
+		Password: redisPassword, // no password set
+		DB:       0,             // use default DB
+		MaintNotificationsConfig: &maintnotifications.Config{
+			Mode: maintnotifications.ModeDisabled,
+		},
+	})
+	s, err := inventory.NewRedisInventoryService(rdb)
+	if err != nil {
+		log.Fatalf("Unable to connect to inventory redis: %v", err)
+		return
+	}
+
+	server := &Server{service: s}
+
+	// Set up HTTP routes
+	http.HandleFunc("/livez", server.livezHandler)
+	http.HandleFunc("/readyz", server.readyzHandler)
+	http.HandleFunc("/inventory/", server.getInventoryHandler)
+
+	stockhandler := &StockHandler{
+		MainStockLocationID: inventory.LocationID(country),
+		rdb:                 rdb,
+		ctx:                 ctx,
+		svc:                 *s,
+	}
+
+	amqpUrl, ok := os.LookupEnv("RABBIT_HOST")
+	if ok {
+		log.Printf("Connecting to rabbitmq")
+		conn, err := amqp.DialConfig(amqpUrl, amqp.Config{
+			Properties: amqp.NewConnectionProperties(),
+		})
+		//a.conn = conn
+		if err != nil {
+			log.Fatalf("Failed to connect to RabbitMQ: %v", err)
+		}
+		ch, err := conn.Channel()
+		if err != nil {
+			log.Fatalf("Failed to open a channel: %v", err)
+		}
+		// items listener
+		err = messaging.ListenToTopic(ch, country, "item_added", func(d amqp.Delivery) error {
+			var items []*index.DataItem
+			err := json.Unmarshal(d.Body, &items)
+			if err == nil {
+				log.Printf("Got upserts %d, message count %d", len(items), d.MessageCount)
+				wg := &sync.WaitGroup{}
+				for _, item := range items {
+					stockhandler.HandleItem(item, wg)
+				}
+				wg.Wait()
+				log.Print("Batch done...")
+			} else {
+				log.Printf("Failed to unmarshal upsert message %v", err)
+			}
+			return err
+		})
+		if err != nil {
+			log.Fatalf("Failed to listen to item_added topic: %v", err)
+		}
+	}
+
+	// Start HTTP server
+	log.Println("Starting HTTP server on :8080")
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}

cmd/inventory/stockhandler.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"context"
+	"log"
+	"strconv"
+	"strings"
+	"sync"
+
+	"git.tornberg.me/mats/go-redis-inventory/pkg/inventory"
+	"github.com/matst80/slask-finder/pkg/types"
+	"github.com/redis/go-redis/v9"
+)
+
+type StockHandler struct {
+	rdb                 *redis.Client
+	ctx                 context.Context
+	svc                 inventory.RedisInventoryService
+	MainStockLocationID inventory.LocationID
+}
+
+func (s *StockHandler) HandleItem(item types.Item, wg *sync.WaitGroup) {
+	wg.Go(func() {
+		ctx := s.ctx
+		pipe := s.rdb.Pipeline()
+		centralStockString, ok := item.GetStringFieldValue(3)
+		if !ok {
+			centralStockString = "0"
+		}
+		centralStockString = strings.Replace(centralStockString, "+", "", -1)
+		centralStockString = strings.Replace(centralStockString, "<", "", -1)
+		centralStockString = strings.Replace(centralStockString, ">", "", -1)
+		centralStock, err := strconv.ParseInt(centralStockString, 10, 64)
+
+		if err != nil {
+			log.Printf("unable to parse central stock for item %s: %v", item.GetSku(), err)
+			centralStock = 0
+		} else {
+			s.svc.UpdateInventory(ctx, pipe, inventory.SKU(item.GetSku()), s.MainStockLocationID, int64(centralStock))
+		}
+		for id, value := range item.GetStock() {
+			s.svc.UpdateInventory(ctx, pipe, inventory.SKU(item.GetSku()), inventory.LocationID(id), int64(value))
+		}
+		_, err = pipe.Exec(ctx)
+		if err != nil {
+			log.Printf("unable to update stock: %v", err)
+		}
+	})
+}

deployment/deployment.yaml

@@ -9,6 +9,92 @@ type: Opaque
 ---
 apiVersion: apps/v1
 kind: Deployment
+metadata:
+  labels:
+    app: cart-backoffice
+    arch: amd64
+  name: cart-backoffice-x86
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: cart-backoffice
+      arch: amd64
+  template:
+    metadata:
+      labels:
+        app: cart-backoffice
+        arch: amd64
+    spec:
+      affinity:
+        nodeAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            nodeSelectorTerms:
+              - matchExpressions:
+                  - key: kubernetes.io/arch
+                    operator: NotIn
+                    values:
+                      - arm64
+      volumes:
+        - name: data
+          nfs:
+            path: /i-data/7a8af061/nfs/cart-actor
+            server: 10.10.1.10
+      serviceAccountName: default
+      containers:
+        - image: registry.k6n.net/go-cart-actor-amd64:latest
+          name: cart-actor-amd64
+          imagePullPolicy: Always
+          command: ["/go-cart-backoffice"]
+          lifecycle:
+            preStop:
+              exec:
+                command: ["sleep", "15"]
+          ports:
+            - containerPort: 8080
+              name: web
+          livenessProbe:
+            httpGet:
+              path: /livez
+              port: web
+            failureThreshold: 1
+            periodSeconds: 30
+          readinessProbe:
+            httpGet:
+              path: /readyz
+              port: web
+            failureThreshold: 2
+            initialDelaySeconds: 2
+            periodSeconds: 30
+          volumeMounts:
+            - mountPath: "/data"
+              name: data
+          resources:
+            limits:
+              memory: "768Mi"
+            requests:
+              memory: "70Mi"
+              cpu: "1200m"
+          env:
+            - name: TZ
+              value: "Europe/Stockholm"
+            - name: KLARNA_API_USERNAME
+              valueFrom:
+                secretKeyRef:
+                  name: klarna-api-credentials
+                  key: username
+            - name: KLARNA_API_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: klarna-api-credentials
+                  key: password
+            - name: AMQP_URL
+              value: "amqp://admin:12bananer@rabbitmq.dev:5672/"
+            # - name: BASE_URL
+            #   value: "https://s10n-no.tornberg.me"
+---
+apiVersion: apps/v1
+kind: Deployment
 metadata:
   labels:
     app: cart-actor
@@ -41,11 +127,9 @@ spec:
           nfs:
             path: /i-data/7a8af061/nfs/cart-actor
             server: 10.10.1.10
-      imagePullSecrets:
-        - name: regcred
       serviceAccountName: default
       containers:
-        - image: registry.knatofs.se/go-cart-actor-amd64:latest
+        - image: registry.k6n.net/go-cart-actor-amd64:latest
           name: cart-actor-amd64
           imagePullPolicy: Always
           lifecycle:
@@ -55,6 +139,8 @@ spec:
           ports:
             - containerPort: 8080
               name: web
+            - containerPort: 8081
+              name: debug
             - containerPort: 1337
               name: rpc
           livenessProbe:
@@ -62,14 +148,14 @@ spec:
               path: /livez
               port: web
             failureThreshold: 1
-            periodSeconds: 10
+            periodSeconds: 30
           readinessProbe:
             httpGet:
               path: /readyz
               port: web
             failureThreshold: 2
             initialDelaySeconds: 2
-            periodSeconds: 10
+            periodSeconds: 50
           volumeMounts:
             - mountPath: "/data"
               name: data
@@ -87,6 +173,14 @@ spec:
                 secretKeyRef:
                   name: klarna-api-credentials
                   key: username
+            - name: REDIS_ADDRESS
+              value: "10.10.3.18:6379"
+            - name: REDIS_PASSWORD
+              value: "slaskredis"
+            - name: OTEL_RESOURCE_ATTRIBUTES
+              value: "service.name=cart,service.version=0.1.2"
+            - name: OTEL_EXPORTER_OTLP_ENDPOINT
+              value: "http://otel-debug-service.monitoring:4317"
             - name: KLARNA_API_PASSWORD
               valueFrom:
                 secretKeyRef:
@@ -143,11 +237,9 @@ spec:
           nfs:
             path: /i-data/7a8af061/nfs/cart-actor
             server: 10.10.1.10
-      imagePullSecrets:
-        - name: regcred
       serviceAccountName: default
       containers:
-        - image: registry.knatofs.se/go-cart-actor:latest
+        - image: registry.k6n.net/go-cart-actor:latest
           name: cart-actor-arm64
           imagePullPolicy: Always
           lifecycle:
@@ -157,6 +249,8 @@ spec:
           ports:
             - containerPort: 8080
               name: web
+            - containerPort: 8081
+              name: debug
             - containerPort: 1337
               name: rpc
           livenessProbe:
@@ -164,14 +258,14 @@ spec:
               path: /livez
               port: web
             failureThreshold: 1
-            periodSeconds: 10
+            periodSeconds: 30
           readinessProbe:
             httpGet:
               path: /readyz
               port: web
             failureThreshold: 2
             initialDelaySeconds: 2
-            periodSeconds: 10
+            periodSeconds: 30
           volumeMounts:
             - mountPath: "/data"
               name: data
@@ -184,6 +278,14 @@ spec:
           env:
             - name: TZ
               value: "Europe/Stockholm"
+            - name: REDIS_ADDRESS
+              value: "redis.home:6379"
+            - name: REDIS_PASSWORD
+              value: "slaskredis"
+            - name: OTEL_RESOURCE_ATTRIBUTES
+              value: "service.name=cart,service.version=0.1.2"
+            - name: OTEL_EXPORTER_OTLP_ENDPOINT
+              value: "http://otel-debug-service.monitoring:4317"
             - name: KLARNA_API_USERNAME
               valueFrom:
                 secretKeyRef:
@@ -212,7 +314,7 @@ apiVersion: v1
 metadata:
   name: cart-actor
   annotations:
-    prometheus.io/port: "8080"
+    prometheus.io/port: "8081"
     prometheus.io/scrape: "true"
     prometheus.io/path: "/metrics"
 spec:
@@ -222,6 +324,17 @@ spec:
     - name: web
       port: 8080
 ---
+kind: Service
+apiVersion: v1
+metadata:
+  name: cart-backoffice
+spec:
+  selector:
+    app: cart-backoffice
+  ports:
+    - name: web
+      port: 8080
+---
 apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
@@ -250,3 +363,98 @@ spec:
                 name: cart-actor
                 port:
                   number: 8080
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: cart-backend-ingress
+  annotations:
+    cert-manager.io/cluster-issuer: letsencrypt-prod
+spec:
+  ingressClassName: nginx
+  tls:
+    - hosts:
+        - slask-cart.tornberg.me
+      secretName: cart-backoffice-actor-tls-secret
+  rules:
+    - host: slask-cart.tornberg.me
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: cart-backoffice
+                port:
+                  number: 8080
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: cart-inventory
+    arch: amd64
+  name: cart-inventory-x86
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: cart-inventory
+      arch: amd64
+  template:
+    metadata:
+      labels:
+        app: cart-inventory
+        arch: amd64
+    spec:
+      affinity:
+        nodeAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            nodeSelectorTerms:
+              - matchExpressions:
+                  - key: kubernetes.io/arch
+                    operator: NotIn
+                    values:
+                      - arm64
+      serviceAccountName: default
+      containers:
+        - image: registry.k6n.net/go-cart-actor-amd64:latest
+          name: cart-inventory-amd64
+          imagePullPolicy: Always
+          command: ["/go-cart-inventory"]
+          lifecycle:
+            preStop:
+              exec:
+                command: ["sleep", "15"]
+          ports:
+            - containerPort: 8080
+              name: web
+          livenessProbe:
+            httpGet:
+              path: /livez
+              port: web
+            failureThreshold: 1
+            periodSeconds: 30
+          readinessProbe:
+            httpGet:
+              path: /readyz
+              port: web
+            failureThreshold: 2
+            initialDelaySeconds: 2
+            periodSeconds: 30
+          resources:
+            limits:
+              memory: "256Mi"
+              cpu: "500m"
+            requests:
+              memory: "50Mi"
+              cpu: "500m"
+          env:
+            - name: TZ
+              value: "Europe/Stockholm"
+            - name: RABBIT_HOST
+              value: amqp://admin:12bananer@rabbitmq.s10n:5672/
+            - name: REDIS_ADDRESS
+              value: "redis.home:6379"
+            - name: REDIS_PASSWORD
+              value: "slaskredis"

go.mod

@@ -1,81 +1,106 @@
 module git.tornberg.me/go-cart-actor
 
-go 1.25.1
+go 1.25.3
 
 require (
+	git.tornberg.me/mats/go-redis-inventory v0.0.0-20251113201741-8bf0efac50ee
 	github.com/gogo/protobuf v1.3.2
 	github.com/google/uuid v1.6.0
-	github.com/matst80/slask-finder v0.0.0-20251009175145-ce05aff5a548
+	github.com/matst80/slask-finder v0.0.0-20251118173753-f66c21cfbda4
 	github.com/prometheus/client_golang v1.23.2
 	github.com/rabbitmq/amqp091-go v1.10.0
-	google.golang.org/grpc v1.76.0
+	github.com/redis/go-redis/v9 v9.16.0
+	go.opentelemetry.io/contrib/bridges/otelslog v0.13.0
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.63.0
+	go.opentelemetry.io/otel v1.38.0
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.14.0
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.38.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.38.0
+	go.opentelemetry.io/otel/log v0.14.0
+	go.opentelemetry.io/otel/metric v1.38.0
+	go.opentelemetry.io/otel/sdk v1.38.0
+	go.opentelemetry.io/otel/sdk/log v0.14.0
+	go.opentelemetry.io/otel/sdk/metric v1.38.0
+	go.opentelemetry.io/otel/trace v1.38.0
+	google.golang.org/grpc v1.77.0
 	google.golang.org/protobuf v1.36.10
-	k8s.io/api v0.34.1
-	k8s.io/apimachinery v0.34.1
-	k8s.io/client-go v0.34.1
+	k8s.io/api v0.34.2
+	k8s.io/apimachinery v0.34.2
+	k8s.io/client-go v0.34.2
 )
 
 require (
-	github.com/RoaringBitmap/roaring/v2 v2.10.0 // indirect
+	github.com/RoaringBitmap/roaring/v2 v2.14.4 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/bits-and-blooms/bitset v1.24.0 // indirect
+	github.com/bits-and-blooms/bitset v1.24.4 // indirect
+	github.com/cenkalti/backoff/v5 v5.0.3 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
-	github.com/dprotaso/go-yit v0.0.0-20220510233725-9ba8df137936 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/dprotaso/go-yit v0.0.0-20251117151522-da16f3077589 // indirect
 	github.com/emicklei/go-restful/v3 v3.13.0 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
-	github.com/getkin/kin-openapi v0.132.0 // indirect
+	github.com/getkin/kin-openapi v0.133.0 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
-	github.com/go-openapi/jsonpointer v0.22.1 // indirect
-	github.com/go-openapi/jsonreference v0.21.2 // indirect
-	github.com/go-openapi/swag v0.25.1 // indirect
-	github.com/go-openapi/swag/cmdutils v0.25.1 // indirect
-	github.com/go-openapi/swag/conv v0.25.1 // indirect
-	github.com/go-openapi/swag/fileutils v0.25.1 // indirect
-	github.com/go-openapi/swag/jsonname v0.25.1 // indirect
-	github.com/go-openapi/swag/jsonutils v0.25.1 // indirect
-	github.com/go-openapi/swag/loading v0.25.1 // indirect
-	github.com/go-openapi/swag/mangling v0.25.1 // indirect
-	github.com/go-openapi/swag/netutils v0.25.1 // indirect
-	github.com/go-openapi/swag/stringutils v0.25.1 // indirect
-	github.com/go-openapi/swag/typeutils v0.25.1 // indirect
-	github.com/go-openapi/swag/yamlutils v0.25.1 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-openapi/jsonpointer v0.22.3 // indirect
+	github.com/go-openapi/jsonreference v0.21.3 // indirect
+	github.com/go-openapi/swag v0.25.3 // indirect
+	github.com/go-openapi/swag/cmdutils v0.25.3 // indirect
+	github.com/go-openapi/swag/conv v0.25.3 // indirect
+	github.com/go-openapi/swag/fileutils v0.25.3 // indirect
+	github.com/go-openapi/swag/jsonname v0.25.3 // indirect
+	github.com/go-openapi/swag/jsonutils v0.25.3 // indirect
+	github.com/go-openapi/swag/loading v0.25.3 // indirect
+	github.com/go-openapi/swag/mangling v0.25.3 // indirect
+	github.com/go-openapi/swag/netutils v0.25.3 // indirect
+	github.com/go-openapi/swag/stringutils v0.25.3 // indirect
+	github.com/go-openapi/swag/typeutils v0.25.3 // indirect
+	github.com/go-openapi/swag/yamlutils v0.25.3 // indirect
 	github.com/google/gnostic-models v0.7.0 // indirect
 	github.com/google/go-cmp v0.7.0 // indirect
 	github.com/gorilla/schema v1.4.1 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.27.3 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/mailru/easyjson v0.9.1 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect
 	github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 // indirect
 	github.com/mschoch/smat v0.2.0 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
-	github.com/oapi-codegen/oapi-codegen/v2 v2.5.0 // indirect
+	github.com/oapi-codegen/oapi-codegen/v2 v2.5.1 // indirect
 	github.com/oasdiff/yaml v0.0.0-20250309154309-f31be36b4037 // indirect
 	github.com/oasdiff/yaml3 v0.0.0-20250309153720-d2182401db90 // indirect
 	github.com/perimeterx/marshmallow v1.1.5 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
-	github.com/prometheus/common v0.67.1 // indirect
-	github.com/prometheus/procfs v0.17.0 // indirect
-	github.com/speakeasy-api/jsonpath v0.6.0 // indirect
-	github.com/speakeasy-api/openapi-overlay v0.10.2 // indirect
-	github.com/spf13/pflag v1.0.6 // indirect
+	github.com/prometheus/common v0.67.3 // indirect
+	github.com/prometheus/procfs v0.19.2 // indirect
+	github.com/speakeasy-api/jsonpath v0.6.2 // indirect
+	github.com/speakeasy-api/openapi-overlay v0.10.3 // indirect
+	github.com/spf13/pflag v1.0.10 // indirect
 	github.com/vmware-labs/yaml-jsonpath v0.3.2 // indirect
+	github.com/woodsbury/decimal128 v1.3.0 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
+	go.opentelemetry.io/auto/sdk v1.2.1 // indirect
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.38.0 // indirect
+	go.opentelemetry.io/proto/otlp v1.9.0 // indirect
 	go.yaml.in/yaml/v2 v2.4.3 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
-	golang.org/x/mod v0.28.0 // indirect
-	golang.org/x/net v0.46.0 // indirect
-	golang.org/x/oauth2 v0.32.0 // indirect
-	golang.org/x/sync v0.17.0 // indirect
-	golang.org/x/sys v0.37.0 // indirect
-	golang.org/x/term v0.36.0 // indirect
-	golang.org/x/text v0.30.0 // indirect
+	go.yaml.in/yaml/v4 v4.0.0-rc.3 // indirect
+	golang.org/x/mod v0.30.0 // indirect
+	golang.org/x/net v0.47.0 // indirect
+	golang.org/x/oauth2 v0.33.0 // indirect
+	golang.org/x/sync v0.18.0 // indirect
+	golang.org/x/sys v0.38.0 // indirect
+	golang.org/x/term v0.37.0 // indirect
+	golang.org/x/text v0.31.0 // indirect
 	golang.org/x/time v0.14.0 // indirect
-	golang.org/x/tools v0.37.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20251007200510-49b9836ed3ff // indirect
+	golang.org/x/tools v0.39.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20251111163417-95abcf5c77ba // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20251111163417-95abcf5c77ba // indirect
 	gopkg.in/evanphx/json-patch.v4 v4.13.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect

go.sum

@@ -1,67 +1,78 @@
-github.com/RoaringBitmap/roaring/v2 v2.10.0 h1:HbJ8Cs71lfCJyvmSptxeMX2PtvOC8yonlU0GQcy2Ak0=
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+git.tornberg.me/mats/go-redis-inventory v0.0.0-20251113201741-8bf0efac50ee/go.mod h1:jrDU55O7sdN2RJr99upmig/FAla/mW1Cdju7834TXug=
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-golang.org/x/text v0.30.0 h1:yznKA/E9zq54KzlzBEAWn1NXSQ8DIp/NYMy88xJjl4k=
-golang.org/x/text v0.30.0/go.mod h1:yDdHFIX9t+tORqspjENWgzaCVXgk0yYnYuSZ8UzzBVM=
+golang.org/x/text v0.31.0 h1:aC8ghyu4JhP8VojJ2lEHBnochRno1sgL6nEi9WGFGMM=
+golang.org/x/text v0.31.0/go.mod h1:tKRAlv61yKIjGGHX/4tP1LTbc13YSec1pxVEWXzfoeM=
 golang.org/x/time v0.14.0 h1:MRx4UaLrDotUKUdCIqzPC48t1Y9hANFKIRpNx+Te8PI=
 golang.org/x/time v0.14.0/go.mod h1:eL/Oa2bBBK0TkX57Fyni+NgnyQQN4LitPmob2Hjnqw4=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20200619180055-7c47624df98f/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
-golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
-golang.org/x/tools v0.37.0 h1:DVSRzp7FwePZW356yEAChSdNcQo6Nsp+fex1SUW09lE=
-golang.org/x/tools v0.37.0/go.mod h1:MBN5QPQtLMHVdvsbtarmTNukZDdgwdwlO5qGacAzF0w=
+golang.org/x/tools v0.39.0 h1:ik4ho21kwuQln40uelmciQPp9SipgNDdrafrYA4TmQQ=
+golang.org/x/tools v0.39.0/go.mod h1:JnefbkDPyD8UU2kI5fuf8ZX4/yUeh9W877ZeBONxUqQ=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
 gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20251007200510-49b9836ed3ff h1:A90eA31Wq6HOMIQlLfzFwzqGKBTuaVztYu/g8sn+8Zc=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20251007200510-49b9836ed3ff/go.mod h1:7i2o+ce6H/6BluujYR+kqX3GKH+dChPTQU19wjRPiGk=
-google.golang.org/grpc v1.76.0 h1:UnVkv1+uMLYXoIz6o7chp59WfQUYA2ex/BXQ9rHZu7A=
-google.golang.org/grpc v1.76.0/go.mod h1:Ju12QI8M6iQJtbcsV+awF5a4hfJMLi4X0JLo94ULZ6c=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/genproto/googleapis/api v0.0.0-20251111163417-95abcf5c77ba h1:B14OtaXuMaCQsl2deSvNkyPKIzq3BjfxQp8d00QyWx4=
+google.golang.org/genproto/googleapis/api v0.0.0-20251111163417-95abcf5c77ba/go.mod h1:G5IanEx8/PgI9w6CFcYQf7jMtHQhZruvfM1i3qOqk5U=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251111163417-95abcf5c77ba h1:UKgtfRM7Yh93Sya0Fo8ZzhDP4qBckrrxEr2oF5UIVb8=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251111163417-95abcf5c77ba/go.mod h1:7i2o+ce6H/6BluujYR+kqX3GKH+dChPTQU19wjRPiGk=
+google.golang.org/grpc v1.77.0 h1:wVVY6/8cGA6vvffn+wWK5ToddbgdU3d8MNENr4evgXM=
+google.golang.org/grpc v1.77.0/go.mod h1:z0BY1iVj0q8E1uSQCjL9cppRj+gnZjzDnzV0dHhrNig=
 google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
 google.golang.org/protobuf v1.36.10/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -307,20 +301,18 @@ gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWD
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20191026110619-0b21df46bc1d/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-k8s.io/api v0.34.1 h1:jC+153630BMdlFukegoEL8E/yT7aLyQkIVuwhmwDgJM=
-k8s.io/api v0.34.1/go.mod h1:SB80FxFtXn5/gwzCoN6QCtPD7Vbu5w2n1S0J5gFfTYk=
-k8s.io/apimachinery v0.34.1 h1:dTlxFls/eikpJxmAC7MVE8oOeP1zryV7iRyIjB0gky4=
-k8s.io/apimachinery v0.34.1/go.mod h1:/GwIlEcWuTX9zKIg2mbw0LRFIsXwrfoVxn+ef0X13lw=
-k8s.io/client-go v0.34.1 h1:ZUPJKgXsnKwVwmKKdPfw4tB58+7/Ik3CrjOEhsiZ7mY=
-k8s.io/client-go v0.34.1/go.mod h1:kA8v0FP+tk6sZA0yKLRG67LWjqufAoSHA2xVGKw9Of8=
+k8s.io/api v0.34.2 h1:fsSUNZhV+bnL6Aqrp6O7lMTy6o5x2C4XLjnh//8SLYY=
+k8s.io/api v0.34.2/go.mod h1:MMBPaWlED2a8w4RSeanD76f7opUoypY8TFYkSM+3XHw=
+k8s.io/apimachinery v0.34.2 h1:zQ12Uk3eMHPxrsbUJgNF8bTauTVR2WgqJsTmwTE/NW4=
+k8s.io/apimachinery v0.34.2/go.mod h1:/GwIlEcWuTX9zKIg2mbw0LRFIsXwrfoVxn+ef0X13lw=
+k8s.io/client-go v0.34.2 h1:Co6XiknN+uUZqiddlfAjT68184/37PS4QAzYvQvDR8M=
+k8s.io/client-go v0.34.2/go.mod h1:2VYDl1XXJsdcAxw7BenFslRQX28Dxz91U9MWKjX97fE=
 k8s.io/klog/v2 v2.130.1 h1:n9Xl7H1Xvksem4KFG4PYbdQCQxqc/tTUyrgXaOhHSzk=
 k8s.io/klog/v2 v2.130.1/go.mod h1:3Jpz1GvMt720eyJH1ckRHK1EDfpxISzJ7I9OYgaDtPE=
 k8s.io/kube-openapi v0.0.0-20250910181357-589584f1c912 h1:Y3gxNAuB0OBLImH611+UDZcmKS3g6CthxToOb37KgwE=

pkg/actor/disk_storage.go

@@ -1,6 +1,7 @@
 package actor
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"log"
@@ -25,8 +26,8 @@ type DiskStorage[V any] struct {
 }
 
 type LogStorage[V any] interface {
-	LoadEvents(id uint64, grain Grain[V]) error
-	AppendEvent(id uint64, msg ...proto.Message) error
+	LoadEvents(ctx context.Context, id uint64, grain Grain[V]) error
+	AppendMutations(id uint64, msg ...proto.Message) error
 }
 
 func NewDiskStorage[V any](path string, registry MutationRegistry) *DiskStorage[V] {
@@ -86,7 +87,7 @@ func (s *DiskStorage[V]) logPath(id uint64) string {
 	return filepath.Join(s.path, fmt.Sprintf("%d.events.log", id))
 }
 
-func (s *DiskStorage[V]) LoadEvents(id uint64, grain Grain[V]) error {
+func (s *DiskStorage[V]) LoadEvents(ctx context.Context, id uint64, grain Grain[V]) error {
 	path := s.logPath(id)
 	if _, err := os.Stat(path); errors.Is(err, os.ErrNotExist) {
 		// No log -> nothing to replay
@@ -99,16 +100,18 @@ func (s *DiskStorage[V]) LoadEvents(id uint64, grain Grain[V]) error {
 	}
 	defer fh.Close()
 	return s.Load(fh, func(msg proto.Message) {
-		s.registry.Apply(grain, msg)
+		s.registry.Apply(ctx, grain, msg)
 	})
 }
 
 func (s *DiskStorage[V]) Close() {
-	s.save()
+	if s.queue != nil {
+		s.save()
+	}
 	close(s.done)
 }
 
-func (s *DiskStorage[V]) AppendEvent(id uint64, msg ...proto.Message) error {
+func (s *DiskStorage[V]) AppendMutations(id uint64, msg ...proto.Message) error {
 	if s.queue != nil {
 		queue := make([]QueueEvent, 0)
 		data, found := s.queue.Load(id)

pkg/actor/grain_pool.go

@@ -1,6 +1,7 @@
 package actor
 
 import (
+	"context"
 	"net/http"
 
 	"github.com/gogo/protobuf/proto"
@@ -12,8 +13,8 @@ type MutationResult[V any] struct {
 }
 
 type GrainPool[V any] interface {
-	Apply(id uint64, mutation ...proto.Message) (*MutationResult[V], error)
-	Get(id uint64) (V, error)
+	Apply(ctx context.Context, id uint64, mutation ...proto.Message) (*MutationResult[V], error)
+	Get(ctx context.Context, id uint64) (V, error)
 	OwnerHost(id uint64) (Host, bool)
 	Hostname() string
 	TakeOwnership(id uint64)
@@ -22,8 +23,10 @@ type GrainPool[V any] interface {
 	Negotiate(otherHosts []string)
 	GetLocalIds() []uint64
 	RemoveHost(host string)
+	AddRemoteHost(host string)
 	IsHealthy() bool
 	IsKnown(string) bool
+	GetPubSub() *PubSub
 	Close()
 }
 

pkg/actor/grpc_server.go

@@ -8,6 +8,10 @@ import (
 	"time"
 
 	messages "git.tornberg.me/go-cart-actor/pkg/messages"
+	"go.opentelemetry.io/contrib/bridges/otelslog"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/metric"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/reflection"
 )
@@ -16,13 +20,77 @@ import (
 // It delegates to a grain pool and cluster operations to a synced pool.
 type ControlServer[V any] struct {
 	messages.UnimplementedControlPlaneServer
-
 	pool GrainPool[V]
 }
 
+const name = "grpc_server"
+
+var (
+	tracer                 = otel.Tracer(name)
+	meter                  = otel.Meter(name)
+	logger                 = otelslog.NewLogger(name)
+	pingCalls              metric.Int64Counter
+	negotiateCalls         metric.Int64Counter
+	getLocalActorIdsCalls  metric.Int64Counter
+	announceOwnershipCalls metric.Int64Counter
+	announceExpiryCalls    metric.Int64Counter
+	closingCalls           metric.Int64Counter
+)
+
+func init() {
+	var err error
+	pingCalls, err = meter.Int64Counter("grpc.ping_calls",
+		metric.WithDescription("Number of ping calls"),
+		metric.WithUnit("{calls}"))
+	if err != nil {
+		panic(err)
+	}
+	negotiateCalls, err = meter.Int64Counter("grpc.negotiate_calls",
+		metric.WithDescription("Number of negotiate calls"),
+		metric.WithUnit("{calls}"))
+	if err != nil {
+		panic(err)
+	}
+	getLocalActorIdsCalls, err = meter.Int64Counter("grpc.get_local_actor_ids_calls",
+		metric.WithDescription("Number of get local actor ids calls"),
+		metric.WithUnit("{calls}"))
+	if err != nil {
+		panic(err)
+	}
+	announceOwnershipCalls, err = meter.Int64Counter("grpc.announce_ownership_calls",
+		metric.WithDescription("Number of announce ownership calls"),
+		metric.WithUnit("{calls}"))
+	if err != nil {
+		panic(err)
+	}
+	announceExpiryCalls, err = meter.Int64Counter("grpc.announce_expiry_calls",
+		metric.WithDescription("Number of announce expiry calls"),
+		metric.WithUnit("{calls}"))
+	if err != nil {
+		panic(err)
+	}
+	closingCalls, err = meter.Int64Counter("grpc.closing_calls",
+		metric.WithDescription("Number of closing calls"),
+		metric.WithUnit("{calls}"))
+	if err != nil {
+		panic(err)
+	}
+}
+
 func (s *ControlServer[V]) AnnounceOwnership(ctx context.Context, req *messages.OwnershipAnnounce) (*messages.OwnerChangeAck, error) {
+	ctx, span := tracer.Start(ctx, "grpc_announce_ownership")
+	defer span.End()
+	span.SetAttributes(
+		attribute.String("component", "controlplane"),
+		attribute.String("host", req.Host),
+		attribute.Int("id_count", len(req.Ids)),
+	)
+	logger.InfoContext(ctx, "announce ownership", "host", req.Host, "id_count", len(req.Ids))
+	announceOwnershipCalls.Add(ctx, 1, metric.WithAttributes(attribute.String("host", req.Host)))
+
 	err := s.pool.HandleOwnershipChange(req.Host, req.Ids)
 	if err != nil {
+		span.RecordError(err)
 		return &messages.OwnerChangeAck{
 			Accepted: false,
 			Message:  "owner change failed",
@@ -37,7 +105,20 @@ func (s *ControlServer[V]) AnnounceOwnership(ctx context.Context, req *messages.
 }
 
 func (s *ControlServer[V]) AnnounceExpiry(ctx context.Context, req *messages.ExpiryAnnounce) (*messages.OwnerChangeAck, error) {
+	ctx, span := tracer.Start(ctx, "grpc_announce_expiry")
+	defer span.End()
+	span.SetAttributes(
+		attribute.String("component", "controlplane"),
+		attribute.String("host", req.Host),
+		attribute.Int("id_count", len(req.Ids)),
+	)
+	logger.InfoContext(ctx, "announce expiry", "host", req.Host, "id_count", len(req.Ids))
+	announceExpiryCalls.Add(ctx, 1, metric.WithAttributes(attribute.String("host", req.Host)))
+
 	err := s.pool.HandleRemoteExpiry(req.Host, req.Ids)
+	if err != nil {
+		span.RecordError(err)
+	}
 	return &messages.OwnerChangeAck{
 		Accepted: err == nil,
 		Message:  "expiry acknowledged",
@@ -46,15 +127,28 @@ func (s *ControlServer[V]) AnnounceExpiry(ctx context.Context, req *messages.Exp
 
 // ControlPlane: Ping
 func (s *ControlServer[V]) Ping(ctx context.Context, _ *messages.Empty) (*messages.PingReply, error) {
+
+	host := s.pool.Hostname()
+
+	pingCalls.Add(ctx, 1, metric.WithAttributes(attribute.String("host", host)))
+
 	// log.Printf("got ping")
 	return &messages.PingReply{
-		Host:     s.pool.Hostname(),
+		Host:     host,
 		UnixTime: time.Now().Unix(),
 	}, nil
 }
 
 // ControlPlane: Negotiate (merge host views)
 func (s *ControlServer[V]) Negotiate(ctx context.Context, req *messages.NegotiateRequest) (*messages.NegotiateReply, error) {
+	ctx, span := tracer.Start(ctx, "grpc_negotiate")
+	defer span.End()
+	span.SetAttributes(
+		attribute.String("component", "controlplane"),
+		attribute.Int("known_hosts_count", len(req.KnownHosts)),
+	)
+	logger.InfoContext(ctx, "negotiate", "known_hosts_count", len(req.KnownHosts))
+	negotiateCalls.Add(ctx, 1)
 
 	s.pool.Negotiate(req.KnownHosts)
 	return &messages.NegotiateReply{Hosts: req.GetKnownHosts()}, nil
@@ -62,13 +156,33 @@ func (s *ControlServer[V]) Negotiate(ctx context.Context, req *messages.Negotiat
 
 // ControlPlane: GetCartIds (locally owned carts only)
 func (s *ControlServer[V]) GetLocalActorIds(ctx context.Context, _ *messages.Empty) (*messages.ActorIdsReply, error) {
-	return &messages.ActorIdsReply{Ids: s.pool.GetLocalIds()}, nil
+	ctx, span := tracer.Start(ctx, "grpc_get_local_actor_ids")
+	defer span.End()
+	ids := s.pool.GetLocalIds()
+	span.SetAttributes(
+		attribute.String("component", "controlplane"),
+		attribute.Int("id_count", len(ids)),
+	)
+	logger.InfoContext(ctx, "get local actor ids", "id_count", len(ids))
+	getLocalActorIdsCalls.Add(ctx, 1)
+
+	return &messages.ActorIdsReply{Ids: ids}, nil
 }
 
 // ControlPlane: Closing (peer shutdown notification)
 func (s *ControlServer[V]) Closing(ctx context.Context, req *messages.ClosingNotice) (*messages.OwnerChangeAck, error) {
-	if req.GetHost() != "" {
-		s.pool.RemoveHost(req.GetHost())
+	ctx, span := tracer.Start(ctx, "grpc_closing")
+	defer span.End()
+	host := req.GetHost()
+	span.SetAttributes(
+		attribute.String("component", "controlplane"),
+		attribute.String("host", host),
+	)
+	logger.InfoContext(ctx, "closing notice", "host", host)
+	closingCalls.Add(ctx, 1, metric.WithAttributes(attribute.String("host", host)))
+
+	if host != "" {
+		s.pool.RemoveHost(host)
 	}
 	return &messages.OwnerChangeAck{
 		Accepted: true,

pkg/actor/log_listerner.go

@@ -0,0 +1,47 @@
+package actor
+
+import (
+	"log"
+
+	"github.com/matst80/slask-finder/pkg/messaging"
+	amqp "github.com/rabbitmq/amqp091-go"
+)
+
+type LogListener interface {
+	AppendMutations(id uint64, msg ...ApplyResult)
+}
+
+type AmqpListener struct {
+	conn        *amqp.Connection
+	transformer func(id uint64, msg []ApplyResult) (any, error)
+}
+
+func NewAmqpListener(conn *amqp.Connection, transformer func(id uint64, msg []ApplyResult) (any, error)) *AmqpListener {
+	return &AmqpListener{
+		conn:        conn,
+		transformer: transformer,
+	}
+}
+
+func (l *AmqpListener) DefineTopics() {
+	ch, err := l.conn.Channel()
+	if err != nil {
+		log.Fatalf("Failed to open a channel: %v", err)
+	}
+	defer ch.Close()
+	if err := messaging.DefineTopic(ch, "cart", "mutation"); err != nil {
+		log.Fatalf("Failed to declare topic mutation: %v", err)
+	}
+}
+
+func (l *AmqpListener) AppendMutations(id uint64, msg ...ApplyResult) {
+	data, err := l.transformer(id, msg)
+	if err != nil {
+		log.Printf("Failed to transform mutation event: %v", err)
+		return
+	}
+	err = messaging.SendChange(l.conn, "cart", "mutation", data)
+	if err != nil {
+		log.Printf("Failed to send mutation event: %v", err)
+	}
+}

pkg/actor/mutation_registry.go

@@ -1,12 +1,14 @@
 package actor
 
 import (
+	"context"
 	"fmt"
 	"log"
 	"reflect"
 	"sync"
 
 	"github.com/gogo/protobuf/proto"
+	"go.opentelemetry.io/otel/attribute"
 )
 
 type ApplyResult struct {
@@ -15,11 +17,30 @@ type ApplyResult struct {
 	Error    error         `json:"error,omitempty"`
 }
 
+type MutationProcessor interface {
+	Process(ctx context.Context, grain any) error
+}
+
+type BasicMutationProcessor[V any] struct {
+	processor func(ctx context.Context, grain V) error
+}
+
+func NewMutationProcessor[V any](process func(ctx context.Context, grain V) error) MutationProcessor {
+	return &BasicMutationProcessor[V]{
+		processor: process,
+	}
+}
+
+func (p *BasicMutationProcessor[V]) Process(ctx context.Context, grain any) error {
+	return p.processor(ctx, grain.(V))
+}
+
 type MutationRegistry interface {
-	Apply(grain any, msg ...proto.Message) ([]ApplyResult, error)
+	Apply(ctx context.Context, grain any, msg ...proto.Message) ([]ApplyResult, error)
 	RegisterMutations(handlers ...MutationHandler)
 	Create(typeName string) (proto.Message, bool)
 	GetTypeName(msg proto.Message) (string, bool)
+	RegisterProcessor(processor ...MutationProcessor)
 	//GetStorageEvent(msg proto.Message) StorageEvent
 	//FromStorageEvent(event StorageEvent) (proto.Message, error)
 }
@@ -27,6 +48,7 @@ type MutationRegistry interface {
 type ProtoMutationRegistry struct {
 	mutationRegistryMu sync.RWMutex
 	mutationRegistry   map[reflect.Type]MutationHandler
+	processors         []MutationProcessor
 }
 
 var (
@@ -114,9 +136,14 @@ func NewMutationRegistry() MutationRegistry {
 	return &ProtoMutationRegistry{
 		mutationRegistry:   make(map[reflect.Type]MutationHandler),
 		mutationRegistryMu: sync.RWMutex{},
+		processors:         make([]MutationProcessor, 0),
 	}
 }
 
+func (r *ProtoMutationRegistry) RegisterProcessor(processors ...MutationProcessor) {
+	r.processors = append(r.processors, processors...)
+}
+
 func (r *ProtoMutationRegistry) RegisterMutations(handlers ...MutationHandler) {
 	r.mutationRegistryMu.Lock()
 	defer r.mutationRegistryMu.Unlock()
@@ -165,33 +192,65 @@ func (r *ProtoMutationRegistry) Create(typeName string) (proto.Message, bool) {
 // Returns updated grain if successful.
 //
 // If the mutation is not registered, returns (nil, ErrMutationNotRegistered).
-func (r *ProtoMutationRegistry) Apply(grain any, msg ...proto.Message) ([]ApplyResult, error) {
+func (r *ProtoMutationRegistry) Apply(ctx context.Context, grain any, msg ...proto.Message) ([]ApplyResult, error) {
+
+	parentCtx, span := tracer.Start(ctx, "apply mutations")
+	defer span.End()
+	span.SetAttributes(
+		attribute.String("component", "registry"),
+		attribute.Int("mutations", len(msg)),
+	)
+
 	results := make([]ApplyResult, 0, len(msg))
 
 	if grain == nil {
 		return results, fmt.Errorf("nil grain")
 	}
+	// Nil slice of mutations still treated as an error (call contract violation).
 	if msg == nil {
 		return results, fmt.Errorf("nil mutation message")
 	}
 
 	for _, m := range msg {
+		// Ignore nil mutation elements (untyped or typed nil pointers) silently; they carry no data.
+		if m == nil {
+			continue
+		}
+		// Typed nil: interface holds concrete proto message type whose pointer value is nil.
+		rv := reflect.ValueOf(m)
+		if rv.Kind() == reflect.Ptr && rv.IsNil() {
+			continue
+		}
 		rt := indirectType(reflect.TypeOf(m))
+		_, msgSpan := tracer.Start(parentCtx, rt.Name())
+
 		r.mutationRegistryMu.RLock()
 		entry, ok := r.mutationRegistry[rt]
 		r.mutationRegistryMu.RUnlock()
 		if !ok {
 			results = append(results, ApplyResult{Error: ErrMutationNotRegistered, Type: rt.Name(), Mutation: m})
 			continue
+		} else {
+			err := entry.Handle(grain, m)
+			if err != nil {
+				msgSpan.RecordError(err)
+			}
+			results = append(results, ApplyResult{Error: err, Type: rt.Name(), Mutation: m})
 		}
-		err := entry.Handle(grain, m)
-		results = append(results, ApplyResult{Error: err, Type: rt.Name(), Mutation: m})
+		msgSpan.End()
 	}
 
-	// if entry.updateTotals {
-	// 	grain.UpdateTotals()
-	// }
+	if len(results) > 0 {
+		processCtx, processSpan := tracer.Start(ctx, "after mutation processors")
+		defer processSpan.End()
+		for _, processor := range r.processors {
 
+			err := processor.Process(processCtx, grain)
+			if err != nil {
+				return results, err
+			}
+		}
+	}
 	return results, nil
 }
 

pkg/actor/mutation_registry_test.go

@@ -1,6 +1,7 @@
 package actor
 
 import (
+	"context"
 	"errors"
 	"reflect"
 	"slices"
@@ -21,8 +22,8 @@ func TestRegisteredMutationBasics(t *testing.T) {
 		func(state *cartState, msg *messages.AddItem) error {
 			state.calls++
 			// copy to avoid external mutation side-effects (not strictly necessary for the test)
-			cp := *msg
-			state.lastAdded = &cp
+			cp := msg
+			state.lastAdded = cp
 			return nil
 		},
 		func() *messages.AddItem { return &messages.AddItem{} },
@@ -78,7 +79,7 @@ func TestRegisteredMutationBasics(t *testing.T) {
 	// Apply happy path
 	state := &cartState{}
 	add := &messages.AddItem{ItemId: 42, Quantity: 3, Sku: "ABC"}
-	if _, err := reg.Apply(state, add); err != nil {
+	if _, err := reg.Apply(context.Background(), state, add); err != nil {
 		t.Fatalf("Apply returned error: %v", err)
 	}
 	if state.calls != 1 {
@@ -94,12 +95,12 @@ func TestRegisteredMutationBasics(t *testing.T) {
 	}
 
 	// Apply nil message
-	if _, err := reg.Apply(state, nil); err == nil {
+	if _, err := reg.Apply(context.Background(), state, nil); err == nil {
 		t.Fatalf("expected error for nil mutation message")
 	}
 
 	// Apply unregistered message
-	if _, err := reg.Apply(state, &messages.Noop{}); !errors.Is(err, ErrMutationNotRegistered) {
+	if _, err := reg.Apply(context.Background(), state, &messages.Noop{}); !errors.Is(err, ErrMutationNotRegistered) {
 		t.Fatalf("expected ErrMutationNotRegistered, got %v", err)
 	}
 }

pkg/actor/pubsub.go

@@ -0,0 +1,93 @@
+package actor
+
+import (
+	"sync"
+)
+
+// Event represents an event to be published.
+type Event struct {
+	Topic   string
+	Payload interface{}
+}
+
+// NotifyFunc is a function to notify a grain of an event.
+type NotifyFunc func(grainID uint64, event Event)
+
+// Subscribable is an interface for grains that can receive notifications.
+type Subscribable interface {
+	Notify(event Event)
+	UpdateSubscriptions(pubsub *PubSub)
+}
+
+// PubSub manages subscriptions for grains to topics.
+// Topics are strings, e.g., "sku:12345"
+// Subscribers are grain IDs (uint64)
+type PubSub struct {
+	subscribers map[string][]uint64
+	mu          sync.RWMutex
+	notify      NotifyFunc
+}
+
+// NewPubSub creates a new PubSub instance.
+func NewPubSub(notify NotifyFunc) *PubSub {
+	return &PubSub{
+		subscribers: make(map[string][]uint64),
+		notify:      notify,
+	}
+}
+
+// Subscribe adds a grain ID to the subscribers of a topic.
+func (p *PubSub) Subscribe(topic string, grainID uint64) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	p.subscribers[topic] = append(p.subscribers[topic], grainID)
+}
+
+// Unsubscribe removes a grain ID from the subscribers of a topic.
+func (p *PubSub) Unsubscribe(topic string, grainID uint64) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	list := p.subscribers[topic]
+	for i, id := range list {
+		if id == grainID {
+			p.subscribers[topic] = append(list[:i], list[i+1:]...)
+			break
+		}
+	}
+	// If list is empty, could delete, but not necessary
+}
+
+// UnsubscribeAll removes the grain ID from all topics.
+func (p *PubSub) UnsubscribeAll(grainID uint64) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	for topic, list := range p.subscribers {
+		newList := make([]uint64, 0, len(list))
+		for _, id := range list {
+			if id != grainID {
+				newList = append(newList, id)
+			}
+		}
+		if len(newList) == 0 {
+			delete(p.subscribers, topic)
+		} else {
+			p.subscribers[topic] = newList
+		}
+	}
+}
+
+// GetSubscribers returns a copy of the subscriber IDs for a topic.
+func (p *PubSub) GetSubscribers(topic string) []uint64 {
+	p.mu.RLock()
+	defer p.mu.RUnlock()
+	list := p.subscribers[topic]
+	return append([]uint64(nil), list...)
+}
+
+// Publish sends an event to all subscribers of the topic.
+func (p *PubSub) Publish(event Event) {
+	subs := p.GetSubscribers(event.Topic)
+	for _, id := range subs {
+		p.notify(id, event)
+	}
+}

pkg/actor/simple_grain_pool.go

@@ -1,6 +1,7 @@
 package actor
 
 import (
+	"context"
 	"fmt"
 	"log"
 	"maps"
@@ -15,11 +16,13 @@ type SimpleGrainPool[V any] struct {
 	localMu          sync.RWMutex
 	grains           map[uint64]Grain[V]
 	mutationRegistry MutationRegistry
-	spawn            func(id uint64) (Grain[V], error)
+	spawn            func(ctx context.Context, id uint64) (Grain[V], error)
 	spawnHost        func(host string) (Host, error)
+	listeners        []LogListener
 	storage          LogStorage[V]
 	ttl              time.Duration
 	poolSize         int
+	pubsub           *PubSub
 
 	// Cluster coordination --------------------------------------------------
 	hostname     string
@@ -34,7 +37,7 @@ type SimpleGrainPool[V any] struct {
 
 type GrainPoolConfig[V any] struct {
 	Hostname         string
-	Spawn            func(id uint64) (Grain[V], error)
+	Spawn            func(ctx context.Context, id uint64) (Grain[V], error)
 	SpawnHost        func(host string) (Host, error)
 	TTL              time.Duration
 	PoolSize         int
@@ -66,6 +69,19 @@ func NewSimpleGrainPool[V any](config GrainPoolConfig[V]) (*SimpleGrainPool[V],
 	return p, nil
 }
 
+func (p *SimpleGrainPool[V]) AddListener(listener LogListener) {
+	p.listeners = append(p.listeners, listener)
+}
+
+func (p *SimpleGrainPool[V]) RemoveListener(listener LogListener) {
+	for i, l := range p.listeners {
+		if l == listener {
+			p.listeners = append(p.listeners[:i], p.listeners[i+1:]...)
+			break
+		}
+	}
+}
+
 func (p *SimpleGrainPool[V]) purge() {
 	purgeLimit := time.Now().Add(-p.ttl)
 	purgedIds := make([]uint64, 0, len(p.grains))
@@ -73,7 +89,9 @@ func (p *SimpleGrainPool[V]) purge() {
 	for id, grain := range p.grains {
 		if grain.GetLastAccess().Before(purgeLimit) {
 			purgedIds = append(purgedIds, id)
-
+			if p.pubsub != nil {
+				p.pubsub.UnsubscribeAll(id)
+			}
 			delete(p.grains, id)
 		}
 	}
@@ -143,6 +161,10 @@ func (p *SimpleGrainPool[V]) TakeOwnership(id uint64) {
 	p.broadcastOwnership([]uint64{id})
 }
 
+func (p *SimpleGrainPool[V]) AddRemoteHost(host string) {
+	p.AddRemote(host)
+}
+
 func (p *SimpleGrainPool[V]) AddRemote(host string) (Host, error) {
 	if host == "" {
 		return nil, fmt.Errorf("host is empty")
@@ -348,7 +370,7 @@ func (p *SimpleGrainPool[V]) broadcastOwnership(ids []uint64) {
 	// go p.statsUpdate()
 }
 
-func (p *SimpleGrainPool[V]) getOrClaimGrain(id uint64) (Grain[V], error) {
+func (p *SimpleGrainPool[V]) getOrClaimGrain(ctx context.Context, id uint64) (Grain[V], error) {
 	p.localMu.RLock()
 	grain, exists := p.grains[id]
 	p.localMu.RUnlock()
@@ -356,7 +378,7 @@ func (p *SimpleGrainPool[V]) getOrClaimGrain(id uint64) (Grain[V], error) {
 		return grain, nil
 	}
 
-	grain, err := p.spawn(id)
+	grain, err := p.spawn(ctx, id)
 	if err != nil {
 		return nil, err
 	}
@@ -371,27 +393,35 @@ func (p *SimpleGrainPool[V]) getOrClaimGrain(id uint64) (Grain[V], error) {
 // var ErrNotOwner = fmt.Errorf("not owner")
 
 // Apply applies a mutation to a grain.
-func (p *SimpleGrainPool[V]) Apply(id uint64, mutation ...proto.Message) (*MutationResult[*V], error) {
-	grain, err := p.getOrClaimGrain(id)
+func (p *SimpleGrainPool[V]) Apply(ctx context.Context, id uint64, mutation ...proto.Message) (*MutationResult[*V], error) {
+	grain, err := p.getOrClaimGrain(ctx, id)
 	if err != nil {
 		return nil, err
 	}
 
-	mutations, err := p.mutationRegistry.Apply(grain, mutation...)
+	mutations, err := p.mutationRegistry.Apply(ctx, grain, mutation...)
 	if err != nil {
 		return nil, err
 	}
 	if p.storage != nil {
 		go func() {
-			if err := p.storage.AppendEvent(id, mutation...); err != nil {
+			if err := p.storage.AppendMutations(id, mutation...); err != nil {
 				log.Printf("failed to store mutation for grain %d: %v", id, err)
 			}
 		}()
 	}
+	for _, listener := range p.listeners {
+		go listener.AppendMutations(id, mutations...)
+	}
 	result, err := grain.GetCurrentState()
 	if err != nil {
 		return nil, err
 	}
+	if p.pubsub != nil {
+		if sub, ok := any(grain).(Subscribable); ok {
+			sub.UpdateSubscriptions(p.pubsub)
+		}
+	}
 	return &MutationResult[*V]{
 		Result:    result,
 		Mutations: mutations,
@@ -399,8 +429,8 @@ func (p *SimpleGrainPool[V]) Apply(id uint64, mutation ...proto.Message) (*Mutat
 }
 
 // Get returns the current state of a grain.
-func (p *SimpleGrainPool[V]) Get(id uint64) (*V, error) {
-	grain, err := p.getOrClaimGrain(id)
+func (p *SimpleGrainPool[V]) Get(ctx context.Context, id uint64) (*V, error) {
+	grain, err := p.getOrClaimGrain(ctx, id)
 	if err != nil {
 		return nil, err
 	}
@@ -420,6 +450,21 @@ func (p *SimpleGrainPool[V]) Hostname() string {
 	return p.hostname
 }
 
+// GetPubSub returns the pubsub instance.
+func (p *SimpleGrainPool[V]) GetPubSub() *PubSub {
+	return p.pubsub
+}
+
+func (p *SimpleGrainPool[V]) SetPubSub(pubsub *PubSub) {
+	p.pubsub = pubsub
+}
+
+func (p *SimpleGrainPool[V]) Publish(event Event) {
+	if p.pubsub != nil {
+		p.pubsub.Publish(event)
+	}
+}
+
 // Close notifies remotes that this host is shutting down.
 func (p *SimpleGrainPool[V]) Close() {
 

pkg/cart/cart-grain.go

@@ -1,12 +1,13 @@
-package main
+package cart
 
 import (
 	"encoding/json"
-	"fmt"
 	"slices"
+	"strings"
 	"sync"
 	"time"
 
+	"git.tornberg.me/go-cart-actor/pkg/actor"
 	messages "git.tornberg.me/go-cart-actor/pkg/messages"
 	"git.tornberg.me/go-cart-actor/pkg/voucher"
 )
@@ -31,13 +32,14 @@ type ItemMeta struct {
 }
 
 type CartItem struct {
-	Id          uint32      `json:"id"`
-	ItemId      uint32      `json:"itemId,omitempty"`
-	ParentId    uint32      `json:"parentId,omitempty"`
-	Sku         string      `json:"sku"`
-	Price       Price       `json:"price"`
-	TotalPrice  Price       `json:"totalPrice"`
-	OrgPrice    *Price      `json:"orgPrice,omitempty"`
+	Id          uint32  `json:"id"`
+	ItemId      uint32  `json:"itemId,omitempty"`
+	ParentId    *uint32 `json:"parentId,omitempty"`
+	Sku         string  `json:"sku"`
+	Price       Price   `json:"price"`
+	TotalPrice  Price   `json:"totalPrice"`
+	OrgPrice    *Price  `json:"orgPrice,omitempty"`
+	Tax         int
 	Stock       StockStatus `json:"stock"`
 	Quantity    int         `json:"qty"`
 	Discount    *Price      `json:"discount,omitempty"`
@@ -45,6 +47,7 @@ type CartItem struct {
 	ArticleType string      `json:"type,omitempty"`
 	StoreId     *string     `json:"storeId,omitempty"`
 	Meta        *ItemMeta   `json:"meta,omitempty"`
+	SaleStatus  string      `json:"saleStatus"`
 }
 
 type CartDelivery struct {
@@ -62,32 +65,44 @@ type CartNotification struct {
 	Content  string `json:"content"`
 }
 
+type SubscriptionDetails struct {
+	Id           string          `json:"id,omitempty"`
+	Version      uint16          `json:"version"`
+	OfferingCode string          `json:"offeringCode,omitempty"`
+	SigningType  string          `json:"signingType,omitempty"`
+	Meta         json.RawMessage `json:"data,omitempty"`
+}
+
 type CartGrain struct {
-	mu                sync.RWMutex
-	lastItemId        uint32
-	lastDeliveryId    uint32
-	lastVoucherId     uint32
-	lastAccess        time.Time
-	lastChange        time.Time // unix seconds of last successful mutation (replay sets from event ts)
-	userId            string
-	Id                CartId             `json:"id"`
-	Items             []*CartItem        `json:"items"`
-	TotalPrice        *Price             `json:"totalPrice"`
-	TotalDiscount     *Price             `json:"totalDiscount"`
-	Deliveries        []*CartDelivery    `json:"deliveries,omitempty"`
-	Processing        bool               `json:"processing"`
-	PaymentInProgress bool               `json:"paymentInProgress"`
-	OrderReference    string             `json:"orderReference,omitempty"`
-	PaymentStatus     string             `json:"paymentStatus,omitempty"`
-	Vouchers          []*Voucher         `json:"vouchers,omitempty"`
-	Notifications     []CartNotification `json:"cartNotification,omitempty"`
+	mu                  sync.RWMutex
+	lastItemId          uint32
+	lastDeliveryId      uint32
+	lastVoucherId       uint32
+	lastAccess          time.Time
+	lastChange          time.Time // unix seconds of last successful mutation (replay sets from event ts)
+	userId              string
+	InventoryReserved   bool                            `json:"inventoryReserved"`
+	Id                  CartId                          `json:"id"`
+	Items               []*CartItem                     `json:"items"`
+	TotalPrice          *Price                          `json:"totalPrice"`
+	TotalDiscount       *Price                          `json:"totalDiscount"`
+	Deliveries          []*CartDelivery                 `json:"deliveries,omitempty"`
+	Processing          bool                            `json:"processing"`
+	PaymentInProgress   bool                            `json:"paymentInProgress"`
+	OrderReference      string                          `json:"orderReference,omitempty"`
+	PaymentStatus       string                          `json:"paymentStatus,omitempty"`
+	Vouchers            []*Voucher                      `json:"vouchers,omitempty"`
+	Notifications       []CartNotification              `json:"cartNotification,omitempty"`
+	SubscriptionDetails map[string]*SubscriptionDetails `json:"subscriptionDetails,omitempty"`
 }
 
 type Voucher struct {
-	Code  string                  `json:"code"`
-	Rules []*messages.VoucherRule `json:"rules"`
-	Id    uint32                  `json:"id"`
-	Value int64                   `json:"value"`
+	Code        string   `json:"code"`
+	Applied     bool     `json:"applied"`
+	Rules       []string `json:"rules"`
+	Description string   `json:"description,omitempty"`
+	Id          uint32   `json:"id"`
+	Value       int64    `json:"value"`
 }
 
 func (v *Voucher) AppliesTo(cart *CartGrain) ([]*CartItem, bool) {
@@ -119,8 +134,8 @@ func (v *Voucher) AppliesTo(cart *CartGrain) ([]*CartItem, bool) {
 	}
 
 	// All voucher rules must pass (logical AND)
-	for _, rule := range v.Rules {
-		expr := rule.GetCondition()
+	for _, expr := range v.Rules {
+
 		if expr == "" {
 			// Empty condition treated as pass (acts like a comment / placeholder)
 			continue
@@ -138,6 +153,23 @@ func (v *Voucher) AppliesTo(cart *CartGrain) ([]*CartItem, bool) {
 	return cart.Items, true
 }
 
+func NewCartGrain(id uint64, ts time.Time) *CartGrain {
+	return &CartGrain{
+		lastItemId:          0,
+		lastDeliveryId:      0,
+		lastVoucherId:       0,
+		lastAccess:          ts,
+		lastChange:          ts,
+		TotalDiscount:       NewPrice(),
+		Vouchers:            []*Voucher{},
+		Deliveries:          []*CartDelivery{},
+		Id:                  CartId(id),
+		Items:               []*CartItem{},
+		TotalPrice:          NewPrice(),
+		SubscriptionDetails: make(map[string]*SubscriptionDetails),
+	}
+}
+
 func (c *CartGrain) GetId() uint64 {
 	return uint64(c.Id)
 }
@@ -155,21 +187,39 @@ func (c *CartGrain) GetCurrentState() (*CartGrain, error) {
 	return c, nil
 }
 
-func getInt(data float64, ok bool) (int, error) {
-	if !ok {
-		return 0, fmt.Errorf("invalid type")
+// Notify handles incoming events, e.g., inventory changes.
+func (c *CartGrain) Notify(event actor.Event) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	// Example: if event is inventory change for a SKU in the cart
+	if strings.HasPrefix(event.Topic, "inventory:") {
+		sku := strings.TrimPrefix(event.Topic, "inventory:")
+		for _, item := range c.Items {
+			if item.Sku == sku {
+				// Update stock status based on payload, e.g., if payload is bool available
+				if available, ok := event.Payload.(bool); ok {
+					if available {
+						item.Stock = StockStatus(1) // assuming 1 is in stock
+					} else {
+						item.Stock = StockStatus(0) // out of stock
+					}
+				}
+				break
+			}
+		}
 	}
-	return int(data), nil
 }
 
-// func (c *CartGrain) AddItem(sku string, qty int, country string, storeId *string) (*CartGrain, error) {
-// 	cartItem, err := getItemData(sku, qty, country)
-// 	if err != nil {
-// 		return nil, err
-// 	}
-// 	cartItem.StoreId = storeId
-// 	return c.Apply(cartItem, false)
-// }
+func (c *CartGrain) UpdateSubscriptions(pubsub *actor.PubSub) {
+	pubsub.UnsubscribeAll(c.GetId())
+	skuSet := make(map[string]bool)
+	for _, item := range c.Items {
+		skuSet[item.Sku] = true
+	}
+	for sku := range skuSet {
+		pubsub.Subscribe("inventory:"+sku, c.GetId())
+	}
+}
 
 func (c *CartGrain) GetState() ([]byte, error) {
 	return json.Marshal(c)
@@ -240,27 +290,36 @@ func (c *CartGrain) UpdateTotals() {
 	for _, item := range c.Items {
 		rowTotal := MultiplyPrice(item.Price, int64(item.Quantity))
 
-		item.TotalPrice = *rowTotal
-
-		c.TotalPrice.Add(*rowTotal)
-
 		if item.OrgPrice != nil {
 			diff := NewPrice()
 			diff.Add(*item.OrgPrice)
 			diff.Subtract(item.Price)
+			diff.Multiply(int64(item.Quantity))
+			//rowTotal.Subtract(*diff)
+			item.Discount = diff
 			if diff.IncVat > 0 {
 				c.TotalDiscount.Add(*diff)
 			}
 		}
 
+		item.TotalPrice = *rowTotal
+
+		c.TotalPrice.Add(*rowTotal)
+
 	}
 	for _, delivery := range c.Deliveries {
 		c.TotalPrice.Add(delivery.Price)
 	}
 	for _, voucher := range c.Vouchers {
-		if _, ok := voucher.AppliesTo(c); ok {
+		_, ok := voucher.AppliesTo(c)
+		voucher.Applied = false
+		if ok {
 			value := NewPriceFromIncVat(voucher.Value, 25)
-
+			if c.TotalPrice.IncVat <= value.IncVat {
+				// don't apply discounts to more than the total price
+				continue
+			}
+			voucher.Applied = true
 			c.TotalDiscount.Add(*value)
 			c.TotalPrice.Subtract(*value)
 		}

pkg/cart/cart-mutation-helper.go

@@ -0,0 +1,57 @@
+package cart
+
+import (
+	"git.tornberg.me/go-cart-actor/pkg/actor"
+	messages "git.tornberg.me/go-cart-actor/pkg/messages"
+)
+
+func NewCartMultationRegistry() actor.MutationRegistry {
+
+	reg := actor.NewMutationRegistry()
+	reg.RegisterMutations(
+		actor.NewMutation(AddItem, func() *messages.AddItem {
+			return &messages.AddItem{}
+		}),
+		actor.NewMutation(ChangeQuantity, func() *messages.ChangeQuantity {
+			return &messages.ChangeQuantity{}
+		}),
+		actor.NewMutation(RemoveItem, func() *messages.RemoveItem {
+			return &messages.RemoveItem{}
+		}),
+		actor.NewMutation(InitializeCheckout, func() *messages.InitializeCheckout {
+			return &messages.InitializeCheckout{}
+		}),
+		actor.NewMutation(OrderCreated, func() *messages.OrderCreated {
+			return &messages.OrderCreated{}
+		}),
+		actor.NewMutation(RemoveDelivery, func() *messages.RemoveDelivery {
+			return &messages.RemoveDelivery{}
+		}),
+		actor.NewMutation(SetDelivery, func() *messages.SetDelivery {
+			return &messages.SetDelivery{}
+		}),
+		actor.NewMutation(SetPickupPoint, func() *messages.SetPickupPoint {
+			return &messages.SetPickupPoint{}
+		}),
+		actor.NewMutation(ClearCart, func() *messages.ClearCartRequest {
+			return &messages.ClearCartRequest{}
+		}),
+		actor.NewMutation(AddVoucher, func() *messages.AddVoucher {
+			return &messages.AddVoucher{}
+		}),
+		actor.NewMutation(RemoveVoucher, func() *messages.RemoveVoucher {
+			return &messages.RemoveVoucher{}
+		}),
+		actor.NewMutation(UpsertSubscriptionDetails, func() *messages.UpsertSubscriptionDetails {
+			return &messages.UpsertSubscriptionDetails{}
+		}),
+		actor.NewMutation(InventoryReserved, func() *messages.InventoryReserved {
+			return &messages.InventoryReserved{}
+		}),
+		actor.NewMutation(PreConditionFailed, func() *messages.PreConditionFailed {
+			return &messages.PreConditionFailed{}
+		}),
+	)
+	return reg
+
+}

pkg/cart/cart_grain_totals_test.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"testing"
@@ -34,8 +34,8 @@ func TestCartGrainUpdateTotalsBasic(t *testing.T) {
 	}
 
 	// Discount: current implementation computes (OrgPrice - Price) ignoring quantity -> 1500-1250=250
-	if c.TotalDiscount.IncVat != 250 {
-		t.Fatalf("TotalDiscount expected 250 got %d", c.TotalDiscount.IncVat)
+	if c.TotalDiscount.IncVat != 500 {
+		t.Fatalf("TotalDiscount expected 500 got %d", c.TotalDiscount.IncVat)
 	}
 }
 

pkg/cart/cart_id.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"crypto/rand"

pkg/cart/cart_id_test.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"encoding/json"

pkg/cart/mutation_add_item.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"fmt"
@@ -28,9 +28,22 @@ func AddItem(g *CartGrain, m *messages.AddItem) error {
 		return fmt.Errorf("AddItem: invalid quantity %d", m.Quantity)
 	}
 
-	// Fast path: merge with existing item having same SKU
-	if existing, found := g.FindItemWithSku(m.Sku); found {
+	// Merge with any existing item having same SKU and matching StoreId (including both nil).
+	for _, existing := range g.Items {
+		if existing.Sku != m.Sku {
+			continue
+		}
+		sameStore := (existing.StoreId == nil && m.StoreId == nil) ||
+			(existing.StoreId != nil && m.StoreId != nil && *existing.StoreId == *m.StoreId)
+		if !sameStore {
+			continue
+		}
 		existing.Quantity += int(m.Quantity)
+		existing.Stock = StockStatus(m.Stock)
+		// If existing had nil store but new has one, adopt it.
+		if existing.StoreId == nil && m.StoreId != nil {
+			existing.StoreId = m.StoreId
+		}
 		return nil
 	}
 
@@ -50,6 +63,7 @@ func AddItem(g *CartGrain, m *messages.AddItem) error {
 		ItemId:   uint32(m.ItemId),
 		Quantity: int(m.Quantity),
 		Sku:      m.Sku,
+		Tax:      int(taxRate * 100),
 		Meta: &ItemMeta{
 			Name:       m.Name,
 			Image:      m.Image,
@@ -63,6 +77,8 @@ func AddItem(g *CartGrain, m *messages.AddItem) error {
 			SellerId:   m.SellerId,
 			SellerName: m.SellerName,
 		},
+		SaleStatus: m.SaleStatus,
+		ParentId:   m.ParentId,
 
 		Price:      *pricePerItem,
 		TotalPrice: *MultiplyPrice(*pricePerItem, int64(m.Quantity)),

pkg/cart/mutation_add_voucher.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"slices"
@@ -54,10 +54,12 @@ func AddVoucher(g *CartGrain, m *messages.AddVoucher) error {
 
 	g.lastVoucherId++
 	g.Vouchers = append(g.Vouchers, &Voucher{
-		Id:    g.lastVoucherId,
-		Code:  m.Code,
-		Rules: m.VoucherRules,
-		Value: m.Value,
+		Id:          g.lastVoucherId,
+		Applied:     false,
+		Description: m.Description,
+		Code:        m.Code,
+		Rules:       m.VoucherRules,
+		Value:       m.Value,
 	})
 	g.UpdateTotals()
 	return nil

pkg/cart/mutation_change_quantity.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"fmt"
@@ -45,6 +45,7 @@ func ChangeQuantity(g *CartGrain, m *messages.ChangeQuantity) error {
 	if m.Quantity <= 0 {
 		// Remove the item
 		g.Items = append(g.Items[:foundIndex], g.Items[foundIndex+1:]...)
+		g.UpdateTotals()
 		return nil
 	}
 

pkg/cart/mutation_initialize_checkout.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"fmt"

pkg/cart/mutation_inventory_reserved.go

@@ -0,0 +1,8 @@
+package cart
+
+import "git.tornberg.me/go-cart-actor/pkg/messages"
+
+func InventoryReserved(g *CartGrain, m *messages.InventoryReserved) error {
+	g.InventoryReserved = true
+	return nil
+}

pkg/cart/mutation_order_created.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"fmt"

pkg/cart/mutation_precondition.go

@@ -0,0 +1,7 @@
+package cart
+
+import messages "git.tornberg.me/go-cart-actor/pkg/messages"
+
+func PreConditionFailed(g *CartGrain, m *messages.PreConditionFailed) error {
+	return nil
+}

pkg/cart/mutation_remove_delivery.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"fmt"

pkg/cart/mutation_remove_item.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"fmt"

pkg/cart/mutation_set_delivery.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"fmt"

pkg/cart/mutation_set_pickup_point.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"fmt"

pkg/cart/mutation_test.go

@@ -0,0 +1,544 @@
+package cart
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"reflect"
+	"slices"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/gogo/protobuf/proto"
+	"google.golang.org/protobuf/types/known/anypb"
+
+	"git.tornberg.me/go-cart-actor/pkg/actor"
+	messages "git.tornberg.me/go-cart-actor/pkg/messages"
+)
+
+// ----------------------
+// Helper constructors
+// ----------------------
+
+func newTestGrain() *CartGrain {
+	return NewCartGrain(123, time.Now())
+}
+
+func newRegistry() actor.MutationRegistry {
+	return NewCartMultationRegistry()
+}
+
+func msgAddItem(sku string, price int64, qty int32, storePtr *string) *messages.AddItem {
+	return &messages.AddItem{
+		Sku:      sku,
+		Price:    price,
+		Quantity: qty,
+		// Tax left 0 -> handler uses default 25%
+		StoreId: storePtr,
+	}
+}
+
+func msgChangeQty(id uint32, qty int32) *messages.ChangeQuantity {
+	return &messages.ChangeQuantity{Id: id, Quantity: qty}
+}
+
+func msgRemoveItem(id uint32) *messages.RemoveItem {
+	return &messages.RemoveItem{Id: id}
+}
+
+func msgSetDelivery(provider string, items ...uint32) *messages.SetDelivery {
+	uitems := make([]uint32, len(items))
+	copy(uitems, items)
+	return &messages.SetDelivery{Provider: provider, Items: uitems}
+}
+
+func msgSetPickupPoint(deliveryId uint32, id string) *messages.SetPickupPoint {
+	return &messages.SetPickupPoint{
+		DeliveryId: deliveryId,
+		Id:         id,
+		Name:       ptr("Pickup"),
+		Address:    ptr("Street 1"),
+		City:       ptr("Town"),
+		Zip:        ptr("12345"),
+		Country:    ptr("SE"),
+	}
+}
+
+func msgClearCart() *messages.ClearCartRequest {
+	return &messages.ClearCartRequest{}
+}
+
+func msgAddVoucher(code string, value int64, rules ...string) *messages.AddVoucher {
+	return &messages.AddVoucher{Code: code, Value: value, VoucherRules: rules}
+}
+
+func msgRemoveVoucher(id uint32) *messages.RemoveVoucher {
+	return &messages.RemoveVoucher{Id: id}
+}
+
+func msgInitializeCheckout(orderId, status string, inProgress bool) *messages.InitializeCheckout {
+	return &messages.InitializeCheckout{OrderId: orderId, Status: status, PaymentInProgress: inProgress}
+}
+
+func msgOrderCreated(orderId, status string) *messages.OrderCreated {
+	return &messages.OrderCreated{OrderId: orderId, Status: status}
+}
+
+func ptr[T any](v T) *T { return &v }
+
+// ----------------------
+// Apply helpers
+// ----------------------
+
+func applyOne(t *testing.T, reg actor.MutationRegistry, g *CartGrain, msg proto.Message) actor.ApplyResult {
+	t.Helper()
+	results, err := reg.Apply(context.Background(), g, msg)
+	if err != nil {
+		t.Fatalf("unexpected registry-level error applying %T: %v", msg, err)
+	}
+	if len(results) != 1 {
+		t.Fatalf("expected exactly one ApplyResult, got %d", len(results))
+	}
+	return results[0]
+}
+
+// Expect success (nil error inside ApplyResult).
+func applyOK(t *testing.T, reg actor.MutationRegistry, g *CartGrain, msg proto.Message) {
+	t.Helper()
+	res := applyOne(t, reg, g, msg)
+	if res.Error != nil {
+		t.Fatalf("expected mutation %s (%T) to succeed, got error: %v", res.Type, msg, res.Error)
+	}
+}
+
+// Expect an error matching substring.
+func applyErrorContains(t *testing.T, reg actor.MutationRegistry, g *CartGrain, msg proto.Message, substr string) {
+	t.Helper()
+	res := applyOne(t, reg, g, msg)
+	if res.Error == nil {
+		t.Fatalf("expected error applying %T, got nil", msg)
+	}
+	if substr != "" && !strings.Contains(res.Error.Error(), substr) {
+		t.Fatalf("error mismatch, want substring %q got %q", substr, res.Error.Error())
+	}
+}
+
+// ----------------------
+// Tests
+// ----------------------
+
+func TestMutationRegistryCoverage(t *testing.T) {
+	reg := newRegistry()
+
+	expected := []string{
+		"AddItem",
+		"ChangeQuantity",
+		"RemoveItem",
+		"InitializeCheckout",
+		"OrderCreated",
+		"RemoveDelivery",
+		"SetDelivery",
+		"SetPickupPoint",
+		"ClearCartRequest",
+		"AddVoucher",
+		"RemoveVoucher",
+		"UpsertSubscriptionDetails",
+	}
+
+	names := reg.(*actor.ProtoMutationRegistry).RegisteredMutations()
+	for _, want := range expected {
+		if !slices.Contains(names, want) {
+			t.Fatalf("registry missing mutation %s; got %v", want, names)
+		}
+	}
+
+	// Create() by name returns correct concrete type.
+	for _, name := range expected {
+		msg, ok := reg.Create(name)
+		if !ok {
+			t.Fatalf("Create failed for %s", name)
+		}
+		rt := reflect.TypeOf(msg)
+		if rt.Kind() == reflect.Ptr {
+			rt = rt.Elem()
+		}
+		if rt.Name() != name {
+			t.Fatalf("Create(%s) returned wrong type %s", name, rt.Name())
+		}
+	}
+
+	// Unregistered create
+	if m, ok := reg.Create("DoesNotExist"); ok || m != nil {
+		t.Fatalf("Create should fail for unknown; got (%T,%v)", m, ok)
+	}
+
+	// GetTypeName sanity
+	add := &messages.AddItem{}
+	nm, ok := reg.GetTypeName(add)
+	if !ok || nm != "AddItem" {
+		t.Fatalf("GetTypeName failed for AddItem, got (%q,%v)", nm, ok)
+	}
+
+	// Apply unregistered message -> result should contain ErrMutationNotRegistered, no top-level error
+	results, err := reg.Apply(context.Background(), newTestGrain(), &messages.Noop{})
+	if err != nil {
+		t.Fatalf("unexpected top-level error applying unregistered mutation: %v", err)
+	}
+	if len(results) != 1 || results[0].Error == nil || results[0].Error != actor.ErrMutationNotRegistered {
+		t.Fatalf("expected ApplyResult with ErrMutationNotRegistered, got %#v", results)
+	}
+}
+
+func TestAddItemAndMerging(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	// Merge scenario (same SKU + same store pointer)
+	add1 := msgAddItem("SKU-1", 1000, 2, nil)
+	applyOK(t, reg, g, add1)
+
+	if len(g.Items) != 1 || g.Items[0].Quantity != 2 {
+		t.Fatalf("expected first item added; items=%d qty=%d", len(g.Items), g.Items[0].Quantity)
+	}
+
+	applyOK(t, reg, g, msgAddItem("SKU-1", 1000, 3, nil)) // should merge
+	if len(g.Items) != 1 || g.Items[0].Quantity != 5 {
+		t.Fatalf("expected merge quantity=5 items=%d qty=%d", len(g.Items), g.Items[0].Quantity)
+	}
+
+	// Different store pointer -> new line
+	store := "S1"
+	applyOK(t, reg, g, msgAddItem("SKU-1", 1000, 1, &store))
+	if len(g.Items) != 2 {
+		t.Fatalf("expected second line for different store pointer; items=%d", len(g.Items))
+	}
+
+	// Same store pointer & SKU -> merge with second line
+	applyOK(t, reg, g, msgAddItem("SKU-1", 1000, 4, &store))
+	if len(g.Items) != 2 || g.Items[1].Quantity != 5 {
+		t.Fatalf("expected merge on second line; items=%d second.qty=%d", len(g.Items), g.Items[1].Quantity)
+	}
+
+	// Invalid quantity
+	applyErrorContains(t, reg, g, msgAddItem("BAD", 1000, 0, nil), "invalid quantity")
+}
+
+func TestChangeQuantityBehavior(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	applyOK(t, reg, g, msgAddItem("A", 1500, 2, nil))
+	id := g.Items[0].Id
+
+	// Increase quantity
+	applyOK(t, reg, g, msgChangeQty(id, 5))
+	if g.Items[0].Quantity != 5 {
+		t.Fatalf("quantity not updated expected=5 got=%d", g.Items[0].Quantity)
+	}
+
+	// Remove item by setting <=0
+	applyOK(t, reg, g, msgChangeQty(id, 0))
+	if len(g.Items) != 0 {
+		t.Fatalf("expected item removed; items=%d", len(g.Items))
+	}
+
+	// Not found
+	applyErrorContains(t, reg, g, msgChangeQty(9999, 1), "not found")
+}
+
+func TestRemoveItemBehavior(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	applyOK(t, reg, g, msgAddItem("X", 1200, 1, nil))
+	id := g.Items[0].Id
+
+	applyOK(t, reg, g, msgRemoveItem(id))
+	if len(g.Items) != 0 {
+		t.Fatalf("expected item removed; items=%d", len(g.Items))
+	}
+
+	applyErrorContains(t, reg, g, msgRemoveItem(id), "not found")
+}
+
+func TestDeliveryMutations(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	applyOK(t, reg, g, msgAddItem("D1", 1000, 1, nil))
+	applyOK(t, reg, g, msgAddItem("D2", 2000, 1, nil))
+	i1 := g.Items[0].Id
+
+	// Explicit items
+	applyOK(t, reg, g, msgSetDelivery("POSTNORD", i1))
+	if len(g.Deliveries) != 1 || len(g.Deliveries[0].Items) != 1 || g.Deliveries[0].Items[0] != i1 {
+		t.Fatalf("delivery not created as expected: %+v", g.Deliveries)
+	}
+
+	// Attempt to attach an already-delivered item
+	applyErrorContains(t, reg, g, msgSetDelivery("POSTNORD", i1), "already has a delivery")
+
+	// Attach remaining item via empty list (auto include items without delivery)
+	applyOK(t, reg, g, msgSetDelivery("DHL"))
+	if len(g.Deliveries) != 2 {
+		t.Fatalf("expected second delivery; deliveries=%d", len(g.Deliveries))
+	}
+
+	// Non-existent item
+	applyErrorContains(t, reg, g, msgSetDelivery("UPS", 99999), "not found")
+
+	// No eligible items left
+	applyErrorContains(t, reg, g, msgSetDelivery("UPS"), "no eligible items")
+
+	// Set pickup point on first delivery
+	did := g.Deliveries[0].Id
+	applyOK(t, reg, g, msgSetPickupPoint(did, "PP1"))
+	if g.Deliveries[0].PickupPoint == nil || g.Deliveries[0].PickupPoint.Id != "PP1" {
+		t.Fatalf("pickup point not set correctly: %+v", g.Deliveries[0].PickupPoint)
+	}
+
+	// Bad delivery id
+	applyErrorContains(t, reg, g, msgSetPickupPoint(9999, "PPX"), "delivery id")
+
+	// Remove delivery
+	applyOK(t, reg, g, &messages.RemoveDelivery{Id: did})
+	if len(g.Deliveries) != 1 || g.Deliveries[0].Id == did {
+		t.Fatalf("expected first delivery removed, remaining: %+v", g.Deliveries)
+	}
+
+	// Remove delivery not found
+	applyErrorContains(t, reg, g, &messages.RemoveDelivery{Id: did}, "not found")
+}
+
+func TestClearCart(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	applyOK(t, reg, g, msgAddItem("X", 1000, 2, nil))
+	applyOK(t, reg, g, msgSetDelivery("P", g.Items[0].Id))
+
+	applyOK(t, reg, g, msgClearCart())
+
+	if len(g.Items) != 0 || len(g.Deliveries) != 0 {
+		t.Fatalf("expected cart cleared; items=%d deliveries=%d", len(g.Items), len(g.Deliveries))
+	}
+}
+
+func TestVoucherMutations(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	applyOK(t, reg, g, msgAddItem("VOUCH", 10000, 1, nil))
+	applyOK(t, reg, g, msgAddVoucher("PROMO", 5000))
+
+	if len(g.Vouchers) != 1 {
+		t.Fatalf("voucher not stored")
+	}
+	if g.TotalDiscount.IncVat != 5000 {
+		t.Fatalf("expected discount 5000 got %d", g.TotalDiscount.IncVat)
+	}
+	if g.TotalPrice.IncVat != 5000 {
+		t.Fatalf("expected total price 5000 got %d", g.TotalPrice.IncVat)
+	}
+
+	// Duplicate voucher code
+	applyErrorContains(t, reg, g, msgAddVoucher("PROMO", 1000), "already applied")
+
+	// Add a large voucher (should not apply because value > total price)
+	applyOK(t, reg, g, msgAddVoucher("BIG", 100000))
+	if len(g.Vouchers) != 2 {
+		t.Fatalf("expected second voucher stored")
+	}
+	if g.TotalDiscount.IncVat != 5000 || g.TotalPrice.IncVat != 5000 {
+		t.Fatalf("large voucher incorrectly applied discount=%d total=%d",
+			g.TotalDiscount.IncVat, g.TotalPrice.IncVat)
+	}
+
+	// Remove existing voucher
+	firstId := g.Vouchers[0].Id
+	applyOK(t, reg, g, msgRemoveVoucher(firstId))
+
+	if slices.ContainsFunc(g.Vouchers, func(v *Voucher) bool { return v.Id == firstId }) {
+		t.Fatalf("voucher id %d not removed", firstId)
+	}
+	// After removing PROMO, BIG remains but is not applied (exceeds price)
+	if g.TotalDiscount.IncVat != 0 || g.TotalPrice.IncVat != 10000 {
+		t.Fatalf("totals incorrect after removal discount=%d total=%d",
+			g.TotalDiscount.IncVat, g.TotalPrice.IncVat)
+	}
+
+	// Remove not applied
+	applyErrorContains(t, reg, g, msgRemoveVoucher(firstId), "not applied")
+}
+
+func TestCheckoutMutations(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	applyOK(t, reg, g, msgInitializeCheckout("ORD-1", "PENDING", true))
+	if g.OrderReference != "ORD-1" || g.PaymentStatus != "PENDING" || !g.PaymentInProgress {
+		t.Fatalf("initialize checkout failed: ref=%s status=%s inProgress=%v",
+			g.OrderReference, g.PaymentStatus, g.PaymentInProgress)
+	}
+
+	applyOK(t, reg, g, msgOrderCreated("ORD-1", "COMPLETED"))
+	if g.OrderReference != "ORD-1" || g.PaymentStatus != "COMPLETED" || g.PaymentInProgress {
+		t.Fatalf("order created mutation failed: ref=%s status=%s inProgress=%v",
+			g.OrderReference, g.PaymentStatus, g.PaymentInProgress)
+	}
+
+	applyErrorContains(t, reg, g, msgInitializeCheckout("", "X", true), "missing orderId")
+	applyErrorContains(t, reg, g, msgOrderCreated("", "X"), "missing orderId")
+}
+
+func TestSubscriptionDetailsMutation(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	// Upsert new (Id == nil)
+	msgNew := &messages.UpsertSubscriptionDetails{
+		OfferingCode: "OFF1",
+		SigningType:  "TYPE1",
+	}
+	applyOK(t, reg, g, msgNew)
+	if len(g.SubscriptionDetails) != 1 {
+		t.Fatalf("expected one subscription detail; got=%d", len(g.SubscriptionDetails))
+	}
+
+	// Capture created id
+	var createdId string
+	for k := range g.SubscriptionDetails {
+		createdId = k
+	}
+
+	// Update existing
+	msgUpdate := &messages.UpsertSubscriptionDetails{
+		Id:           &createdId,
+		OfferingCode: "OFF2",
+		SigningType:  "TYPE2",
+	}
+	applyOK(t, reg, g, msgUpdate)
+	if g.SubscriptionDetails[createdId].OfferingCode != "OFF2" ||
+		g.SubscriptionDetails[createdId].SigningType != "TYPE2" {
+		t.Fatalf("subscription details not updated: %+v", g.SubscriptionDetails[createdId])
+	}
+
+	// Update non-existent
+	badId := "NON_EXISTENT"
+	applyErrorContains(t, reg, g, &messages.UpsertSubscriptionDetails{Id: &badId}, "not found")
+
+	// Nil mutation should be ignored and produce zero results.
+	resultsNil, errNil := reg.Apply(context.Background(), g, (*messages.UpsertSubscriptionDetails)(nil))
+	if errNil != nil {
+		t.Fatalf("unexpected error for nil mutation element: %v", errNil)
+	}
+	if len(resultsNil) != 0 {
+		t.Fatalf("expected zero results for nil mutation, got %d", len(resultsNil))
+	}
+}
+
+// Ensure registry Apply handles nil grain and nil message defensive errors consistently.
+func TestRegistryDefensiveErrors(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	// Nil grain
+	results, err := reg.Apply(context.Background(), nil, &messages.AddItem{})
+	if err == nil {
+		t.Fatalf("expected error for nil grain")
+	}
+	if len(results) != 0 {
+		t.Fatalf("expected no results for nil grain")
+	}
+
+	// Nil message slice
+	results, _ = reg.Apply(context.Background(), g, nil)
+
+	if len(results) != 0 {
+		t.Fatalf("expected no results when message slice nil")
+	}
+}
+
+type SubscriptionDetailsRequest struct {
+	Id           *string         `json:"id,omitempty"`
+	OfferingCode string          `json:"offeringCode,omitempty"`
+	SigningType  string          `json:"signingType,omitempty"`
+	Data         json.RawMessage `json:"data,omitempty"`
+}
+
+func (sd *SubscriptionDetailsRequest) ToMessage() *messages.UpsertSubscriptionDetails {
+	return &messages.UpsertSubscriptionDetails{
+		Id:           sd.Id,
+		OfferingCode: sd.OfferingCode,
+		SigningType:  sd.SigningType,
+		Data:         &anypb.Any{Value: sd.Data},
+	}
+}
+
+func TestSubscriptionDetailsJSONValidation(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	// Valid JSON on create
+	jsonStr := `{"offeringCode": "OFFJSON", "signingType": "TYPEJSON", "data": {"value":"test","a":1}}`
+	var validCreate SubscriptionDetailsRequest
+	if err := json.Unmarshal([]byte(jsonStr), &validCreate); err != nil {
+		t.Fatal(err)
+	}
+	applyOK(t, reg, g, validCreate.ToMessage())
+	if len(g.SubscriptionDetails) != 1 {
+		t.Fatalf("expected one subscription detail after valid create, got %d", len(g.SubscriptionDetails))
+	}
+	var id string
+	for k := range g.SubscriptionDetails {
+		id = k
+	}
+	if string(g.SubscriptionDetails[id].Meta) != `{"value":"test","a":1}` {
+		t.Fatalf("expected meta stored as valid json, got %s", string(g.SubscriptionDetails[id].Meta))
+	}
+
+	// Update with valid JSON replaces meta
+	jsonStr2 := fmt.Sprintf(`{"id": "%s", "data": {"value": "eyJjaGFuZ2VkIjoxMjN9"}}`, id)
+	var updateValid messages.UpsertSubscriptionDetails
+	if err := json.Unmarshal([]byte(jsonStr2), &updateValid); err != nil {
+		t.Fatal(err)
+	}
+	applyOK(t, reg, g, &updateValid)
+	if string(g.SubscriptionDetails[id].Meta) != `{"changed":123}` {
+		t.Fatalf("expected meta updated to new json, got %s", string(g.SubscriptionDetails[id].Meta))
+	}
+
+	// Invalid JSON on create
+	jsonStr3 := `{"offeringCode": "BAD", "signingType": "TYPE", "data": {"value": "eyJicm9rZW4iO30="}}`
+	var invalidCreate messages.UpsertSubscriptionDetails
+	if err := json.Unmarshal([]byte(jsonStr3), &invalidCreate); err != nil {
+		t.Fatal(err)
+	}
+	res := applyOne(t, reg, g, &invalidCreate)
+	if res.Error == nil || !strings.Contains(res.Error.Error(), "invalid json") {
+		t.Fatalf("expected invalid json error on create, got %v", res.Error)
+	}
+
+	// Invalid JSON on update
+	jsonStr4 := fmt.Sprintf(`{"id": "%s", "data": {"value": "e29vcHM="}}`, id)
+	var badUpdate messages.UpsertSubscriptionDetails
+	if err := json.Unmarshal([]byte(jsonStr4), &badUpdate); err != nil {
+		t.Fatal(err)
+	}
+	res2 := applyOne(t, reg, g, &badUpdate)
+	if res2.Error == nil || !strings.Contains(res2.Error.Error(), "invalid json") {
+		t.Fatalf("expected invalid json error on update, got %v", res2.Error)
+	}
+
+	// Empty Data should not overwrite existing meta
+	jsonStr5 := fmt.Sprintf(`{"id": "%s"}`, id)
+	var emptyUpdate messages.UpsertSubscriptionDetails
+	if err := json.Unmarshal([]byte(jsonStr5), &emptyUpdate); err != nil {
+		t.Fatal(err)
+	}
+	applyOK(t, reg, g, &emptyUpdate)
+	if string(g.SubscriptionDetails[id].Meta) != `{"changed":123}` {
+		t.Fatalf("empty update should not change meta, got %s", string(g.SubscriptionDetails[id].Meta))
+	}
+}

pkg/cart/mutation_upsert_subscriptiondetails.go

@@ -0,0 +1,69 @@
+package cart
+
+import (
+	"encoding/json"
+	"fmt"
+
+	messages "git.tornberg.me/go-cart-actor/pkg/messages"
+)
+
+func UpsertSubscriptionDetails(g *CartGrain, m *messages.UpsertSubscriptionDetails) error {
+	if m == nil {
+		return nil
+	}
+	metaBytes := m.Data.GetValue()
+
+	// Create new subscription details when Id is nil.
+	if m.Id == nil {
+		// Validate JSON if provided.
+		var meta json.RawMessage
+		if metaBytes != nil {
+			if !json.Valid(metaBytes) {
+				return fmt.Errorf("subscription details invalid json")
+			}
+			meta = json.RawMessage(metaBytes)
+		}
+
+		id := MustNewCartId().String()
+
+		g.SubscriptionDetails[id] = &SubscriptionDetails{
+			Id:           id,
+			Version:      1,
+			OfferingCode: m.OfferingCode,
+			SigningType:  m.SigningType,
+			Meta:         meta,
+		}
+		return nil
+	}
+
+	// Update existing entry.
+	existing, ok := g.SubscriptionDetails[*m.Id]
+	if !ok {
+		n := &SubscriptionDetails{
+			Id:      *m.Id,
+			Version: 0,
+		}
+		g.SubscriptionDetails[*m.Id] = n
+		existing = n
+	}
+	changed := false
+	if m.OfferingCode != "" {
+		existing.OfferingCode = m.OfferingCode
+		changed = true
+	}
+	if m.SigningType != "" {
+		existing.SigningType = m.SigningType
+		changed = true
+	}
+	if metaBytes != nil {
+		if !json.Valid(metaBytes) {
+			return fmt.Errorf("subscription details invalid json")
+		}
+		existing.Meta = json.RawMessage(metaBytes)
+		changed = true
+	}
+	if changed {
+		existing.Version++
+	}
+	return nil
+}

pkg/cart/price.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"encoding/json"

pkg/cart/price_test.go

@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"encoding/json"
@@ -33,14 +33,14 @@ func TestPriceMarshalJSON(t *testing.T) {
 }
 
 func TestNewPriceFromIncVat(t *testing.T) {
-	p := NewPriceFromIncVat(1000, 0.25)
-	if p.IncVat != 1000 {
-		t.Fatalf("expected IncVat %d got %d", 1000, p.IncVat)
+	p := NewPriceFromIncVat(1250, 25)
+	if p.IncVat != 1250 {
+		t.Fatalf("expected IncVat %d got %d", 1250, p.IncVat)
 	}
 	if p.VatRates[25] != 250 {
 		t.Fatalf("expected VAT 25 rate %d got %d", 250, p.VatRates[25])
 	}
-	if p.ValueExVat() != 750 {
+	if p.ValueExVat() != 1000 {
 		t.Fatalf("expected exVat %d got %d", 750, p.ValueExVat())
 	}
 }
@@ -133,3 +133,106 @@ func TestPriceMultiplyMethod(t *testing.T) {
 		t.Fatalf("expected exVat %d got %d", exBefore*2, p.ValueExVat())
 	}
 }
+
+func TestGetTaxAmount(t *testing.T) {
+	tests := []struct {
+		total    int64
+		tax      int
+		expected int64
+		desc     string
+	}{
+		{1250, 2500, 250, "25% VAT"}, // 1250 / (1 + 100/25) = 1250 / 5 = 250
+		{1000, 2000, 166, "20% VAT"}, // 1000 / (1 + 100/20) = 1000 / 6 ≈ 166
+		{1200, 2500, 240, "25% VAT on 1200"},
+		{0, 2500, 0, "zero total"},
+		{100, 1000, 9, "10% VAT"},    // tax=1000 for 10%, 100 / (1 + 100/10) = 100 / 11 ≈ 9
+		{100, 10000, 50, "100% VAT"}, // tax=10000 for 100%, 100 / (1 + 100/100) = 100 / 2 = 50
+	}
+
+	for _, tt := range tests {
+		result := GetTaxAmount(tt.total, tt.tax)
+		if result != tt.expected {
+			t.Errorf("GetTaxAmount(%d, %d) [%s] = %d; expected %d", tt.total, tt.tax, tt.desc, result, tt.expected)
+		}
+	}
+}
+
+func TestNewPriceFromIncVatEdgeCases(t *testing.T) {
+	// Zero VAT rate
+	p := NewPriceFromIncVat(1000, 0)
+	if p.IncVat != 1000 {
+		t.Errorf("expected IncVat 1000, got %d", p.IncVat)
+	}
+	if len(p.VatRates) != 1 || p.VatRates[0] != 0 {
+		t.Errorf("expected VAT 0 for rate 0, got %v", p.VatRates)
+	}
+	if p.ValueExVat() != 1000 {
+		t.Errorf("expected exVat 1000, got %d", p.ValueExVat())
+	}
+
+	// High VAT rate, e.g., 50%
+	p = NewPriceFromIncVat(1500, 50)
+	expectedVat := int64(1500 / (1 + 100/50)) // 1500 / 3 = 500
+	if p.VatRates[50] != expectedVat {
+		t.Errorf("expected VAT %d for 50%%, got %d", expectedVat, p.VatRates[50])
+	}
+	if p.ValueExVat() != 1500-expectedVat {
+		t.Errorf("expected exVat %d, got %d", 1500-expectedVat, p.ValueExVat())
+	}
+}
+
+func TestPriceValueExVatAndTotalVat(t *testing.T) {
+	p := Price{IncVat: 13700, VatRates: map[float32]int64{25: 2500, 12: 1200}}
+	exVat := p.ValueExVat()
+	totalVat := p.TotalVat()
+	if exVat != 10000 {
+		t.Errorf("expected exVat 10000, got %d", exVat)
+	}
+	if totalVat != 3700 {
+		t.Errorf("expected totalVat 3700, got %d", totalVat)
+	}
+	if exVat+totalVat != p.IncVat {
+		t.Errorf("exVat + totalVat should equal IncVat: %d + %d != %d", exVat, totalVat, p.IncVat)
+	}
+
+	// Empty VAT rates
+	p2 := Price{IncVat: 500, VatRates: nil}
+	if p2.ValueExVat() != 500 {
+		t.Errorf("expected exVat 500 for no VAT, got %d", p2.ValueExVat())
+	}
+	if p2.TotalVat() != 0 {
+		t.Errorf("expected totalVat 0, got %d", p2.TotalVat())
+	}
+}
+
+func TestMultiplyPriceWithZeroQty(t *testing.T) {
+	base := Price{IncVat: 1250, VatRates: map[float32]int64{25: 250}}
+	multiplied := MultiplyPrice(base, 0)
+	if multiplied.IncVat != 0 {
+		t.Errorf("expected IncVat 0, got %d", multiplied.IncVat)
+	}
+	if len(multiplied.VatRates) != 1 || multiplied.VatRates[25] != 0 {
+		t.Errorf("expected VAT 0, got %v", multiplied.VatRates)
+	}
+}
+
+func TestPriceAddSubtractEdgeCases(t *testing.T) {
+	a := Price{IncVat: 1000, VatRates: map[float32]int64{25: 200}}
+	b := Price{IncVat: 500, VatRates: map[float32]int64{12: 54}} // Different rate
+
+	acc := NewPrice()
+	acc.Add(a)
+	acc.Add(b)
+
+	if acc.VatRates[25] != 200 || acc.VatRates[12] != 54 {
+		t.Errorf("expected VAT 25:200, 12:54, got %v", acc.VatRates)
+	}
+
+	// Subtract more than added (negative VAT)
+	acc.Subtract(a)
+	acc.Subtract(b)
+	acc.Subtract(a) // Subtract extra a
+	if acc.VatRates[25] != -200 || acc.VatRates[12] != 0 {
+		t.Errorf("expected negative VAT for 25 after over-subtract, got %v", acc.VatRates)
+	}
+}

pkg/discovery/discovery.go

@@ -2,6 +2,8 @@ package discovery
 
 import (
 	"context"
+	"slices"
+	"sync"
 
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -33,13 +35,10 @@ func (k *K8sDiscovery) DiscoverInNamespace(namespace string) ([]string, error) {
 	return hosts, nil
 }
 
-type HostChange struct {
-	Host string
-	Type watch.EventType
-}
-
 func (k *K8sDiscovery) Watch() (<-chan HostChange, error) {
 	timeout := int64(30)
+	ipsThatAreReady := make(map[string]bool)
+	m := sync.Mutex{}
 	watcherFn := func(options metav1.ListOptions) (watch.Interface, error) {
 		return k.client.CoreV1().Pods("").Watch(k.ctx, metav1.ListOptions{
 			LabelSelector:  "actor-pool=cart",
@@ -55,10 +54,22 @@ func (k *K8sDiscovery) Watch() (<-chan HostChange, error) {
 		for event := range watcher.ResultChan() {
 
 			pod := event.Object.(*v1.Pod)
-			// log.Printf("pod change %+v", pod.Status.Phase == v1.PodRunning)
+			isReady := slices.ContainsFunc(pod.Status.Conditions, func(condition v1.PodCondition) bool {
+				return condition.Type == v1.PodReady && condition.Status == v1.ConditionTrue
+			})
+			m.Lock()
+			oldState := ipsThatAreReady[pod.Status.PodIP]
+			ipsThatAreReady[pod.Status.PodIP] = isReady
+			m.Unlock()
+			if oldState != isReady {
+				ch <- HostChange{
+					Host:    pod.Status.PodIP,
+					IsReady: isReady,
+				}
+			}
 			ch <- HostChange{
-				Host: pod.Status.PodIP,
-				Type: event.Type,
+				Host:    pod.Status.PodIP,
+				IsReady: isReady,
 			}
 		}
 	}()

pkg/discovery/discovery_mock.go

@@ -2,9 +2,8 @@ package discovery
 
 import (
 	"context"
+	"slices"
 	"sync"
-
-	"k8s.io/apimachinery/pkg/watch"
 )
 
 // MockDiscovery is an in-memory Discovery implementation for tests.
@@ -56,14 +55,12 @@ func (m *MockDiscovery) AddHost(host string) {
 	if m.closed {
 		return
 	}
-	for _, h := range m.hosts {
-		if h == host {
-			return
-		}
+	if slices.Contains(m.hosts, host) {
+		return
 	}
 	m.hosts = append(m.hosts, host)
 	if m.started {
-		m.events <- HostChange{Host: host, Type: watch.Added}
+		m.events <- HostChange{Host: host, IsReady: true}
 	}
 }
 
@@ -86,7 +83,7 @@ func (m *MockDiscovery) RemoveHost(host string) {
 	}
 	m.hosts = append(m.hosts[:idx], m.hosts[idx+1:]...)
 	if m.started {
-		m.events <- HostChange{Host: host, Type: watch.Deleted}
+		m.events <- HostChange{Host: host, IsReady: false}
 	}
 }
 

pkg/discovery/types.go

@@ -1,5 +1,10 @@
 package discovery
 
+type HostChange struct {
+	Host    string
+	IsReady bool
+}
+
 type Discovery interface {
 	Discover() ([]string, error)
 	Watch() (<-chan HostChange, error)

pkg/messages/control_plane.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.36.5
-// 	protoc        v5.29.3
+// 	protoc        v6.33.1
 // source: control_plane.proto
 
 package messages

pkg/messages/control_plane_grpc.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.5.1
-// - protoc             v5.29.3
+// - protoc             v6.33.1
 // source: control_plane.proto
 
 package messages

pkg/messages/messages.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.36.5
-// 	protoc        v5.29.3
+// 	protoc        v6.33.1
 // source: messages.proto
 
 package messages
@@ -9,6 +9,7 @@ package messages
 import (
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	anypb "google.golang.org/protobuf/types/known/anypb"
 	reflect "reflect"
 	sync "sync"
 	unsafe "unsafe"
@@ -79,6 +80,7 @@ type AddItem struct {
 	SellerId      string                 `protobuf:"bytes,19,opt,name=sellerId,proto3" json:"sellerId,omitempty"`
 	SellerName    string                 `protobuf:"bytes,20,opt,name=sellerName,proto3" json:"sellerName,omitempty"`
 	Country       string                 `protobuf:"bytes,21,opt,name=country,proto3" json:"country,omitempty"`
+	SaleStatus    string                 `protobuf:"bytes,24,opt,name=saleStatus,proto3" json:"saleStatus,omitempty"`
 	Outlet        *string                `protobuf:"bytes,12,opt,name=outlet,proto3,oneof" json:"outlet,omitempty"`
 	StoreId       *string                `protobuf:"bytes,22,opt,name=storeId,proto3,oneof" json:"storeId,omitempty"`
 	ParentId      *uint32                `protobuf:"varint,23,opt,name=parentId,proto3,oneof" json:"parentId,omitempty"`
@@ -256,6 +258,13 @@ func (x *AddItem) GetCountry() string {
 	return ""
 }
 
+func (x *AddItem) GetSaleStatus() string {
+	if x != nil {
+		return x.SaleStatus
+	}
+	return ""
+}
+
 func (x *AddItem) GetOutlet() string {
 	if x != nil && x.Outlet != nil {
 		return *x.Outlet
@@ -917,30 +926,29 @@ func (x *InitializeCheckout) GetPaymentInProgress() bool {
 	return false
 }
 
-type VoucherRule struct {
+type InventoryReserved struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
-	Type          string                 `protobuf:"bytes,2,opt,name=type,proto3" json:"type,omitempty"`
-	Description   string                 `protobuf:"bytes,3,opt,name=description,proto3" json:"description,omitempty"`
-	Condition     string                 `protobuf:"bytes,4,opt,name=condition,proto3" json:"condition,omitempty"`
-	Action        string                 `protobuf:"bytes,5,opt,name=action,proto3" json:"action,omitempty"`
+	Id            string                 `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	Status        string                 `protobuf:"bytes,2,opt,name=status,proto3" json:"status,omitempty"`
+	Message       *string                `protobuf:"bytes,3,opt,name=message,proto3,oneof" json:"message,omitempty"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
 }
 
-func (x *VoucherRule) Reset() {
-	*x = VoucherRule{}
+func (x *InventoryReserved) Reset() {
+	*x = InventoryReserved{}
 	mi := &file_messages_proto_msgTypes[12]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
 }
 
-func (x *VoucherRule) String() string {
+func (x *InventoryReserved) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*VoucherRule) ProtoMessage() {}
+func (*InventoryReserved) ProtoMessage() {}
 
-func (x *VoucherRule) ProtoReflect() protoreflect.Message {
+func (x *InventoryReserved) ProtoReflect() protoreflect.Message {
 	mi := &file_messages_proto_msgTypes[12]
 	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -952,35 +960,28 @@ func (x *VoucherRule) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use VoucherRule.ProtoReflect.Descriptor instead.
-func (*VoucherRule) Descriptor() ([]byte, []int) {
+// Deprecated: Use InventoryReserved.ProtoReflect.Descriptor instead.
+func (*InventoryReserved) Descriptor() ([]byte, []int) {
 	return file_messages_proto_rawDescGZIP(), []int{12}
 }
 
-func (x *VoucherRule) GetType() string {
+func (x *InventoryReserved) GetId() string {
 	if x != nil {
-		return x.Type
+		return x.Id
 	}
 	return ""
 }
 
-func (x *VoucherRule) GetDescription() string {
+func (x *InventoryReserved) GetStatus() string {
 	if x != nil {
-		return x.Description
+		return x.Status
 	}
 	return ""
 }
 
-func (x *VoucherRule) GetCondition() string {
-	if x != nil {
-		return x.Condition
-	}
-	return ""
-}
-
-func (x *VoucherRule) GetAction() string {
-	if x != nil {
-		return x.Action
+func (x *InventoryReserved) GetMessage() string {
+	if x != nil && x.Message != nil {
+		return *x.Message
 	}
 	return ""
 }
@@ -989,7 +990,8 @@ type AddVoucher struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
 	Code          string                 `protobuf:"bytes,1,opt,name=code,proto3" json:"code,omitempty"`
 	Value         int64                  `protobuf:"varint,2,opt,name=value,proto3" json:"value,omitempty"`
-	VoucherRules  []*VoucherRule         `protobuf:"bytes,3,rep,name=voucherRules,proto3" json:"voucherRules,omitempty"`
+	VoucherRules  []string               `protobuf:"bytes,3,rep,name=voucherRules,proto3" json:"voucherRules,omitempty"`
+	Description   string                 `protobuf:"bytes,4,opt,name=description,proto3" json:"description,omitempty"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
 }
@@ -1038,13 +1040,20 @@ func (x *AddVoucher) GetValue() int64 {
 	return 0
 }
 
-func (x *AddVoucher) GetVoucherRules() []*VoucherRule {
+func (x *AddVoucher) GetVoucherRules() []string {
 	if x != nil {
 		return x.VoucherRules
 	}
 	return nil
 }
 
+func (x *AddVoucher) GetDescription() string {
+	if x != nil {
+		return x.Description
+	}
+	return ""
+}
+
 type RemoveVoucher struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
 	Id            uint32                 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
@@ -1089,152 +1098,301 @@ func (x *RemoveVoucher) GetId() uint32 {
 	return 0
 }
 
+type UpsertSubscriptionDetails struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Id            *string                `protobuf:"bytes,1,opt,name=id,proto3,oneof" json:"id,omitempty"`
+	OfferingCode  string                 `protobuf:"bytes,2,opt,name=offeringCode,proto3" json:"offeringCode,omitempty"`
+	SigningType   string                 `protobuf:"bytes,3,opt,name=signingType,proto3" json:"signingType,omitempty"`
+	Data          *anypb.Any             `protobuf:"bytes,4,opt,name=data,proto3" json:"data,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *UpsertSubscriptionDetails) Reset() {
+	*x = UpsertSubscriptionDetails{}
+	mi := &file_messages_proto_msgTypes[15]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *UpsertSubscriptionDetails) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*UpsertSubscriptionDetails) ProtoMessage() {}
+
+func (x *UpsertSubscriptionDetails) ProtoReflect() protoreflect.Message {
+	mi := &file_messages_proto_msgTypes[15]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use UpsertSubscriptionDetails.ProtoReflect.Descriptor instead.
+func (*UpsertSubscriptionDetails) Descriptor() ([]byte, []int) {
+	return file_messages_proto_rawDescGZIP(), []int{15}
+}
+
+func (x *UpsertSubscriptionDetails) GetId() string {
+	if x != nil && x.Id != nil {
+		return *x.Id
+	}
+	return ""
+}
+
+func (x *UpsertSubscriptionDetails) GetOfferingCode() string {
+	if x != nil {
+		return x.OfferingCode
+	}
+	return ""
+}
+
+func (x *UpsertSubscriptionDetails) GetSigningType() string {
+	if x != nil {
+		return x.SigningType
+	}
+	return ""
+}
+
+func (x *UpsertSubscriptionDetails) GetData() *anypb.Any {
+	if x != nil {
+		return x.Data
+	}
+	return nil
+}
+
+type PreConditionFailed struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Operation     string                 `protobuf:"bytes,1,opt,name=operation,proto3" json:"operation,omitempty"`
+	Error         string                 `protobuf:"bytes,2,opt,name=error,proto3" json:"error,omitempty"`
+	Input         *anypb.Any             `protobuf:"bytes,3,opt,name=input,proto3" json:"input,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *PreConditionFailed) Reset() {
+	*x = PreConditionFailed{}
+	mi := &file_messages_proto_msgTypes[16]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *PreConditionFailed) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PreConditionFailed) ProtoMessage() {}
+
+func (x *PreConditionFailed) ProtoReflect() protoreflect.Message {
+	mi := &file_messages_proto_msgTypes[16]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PreConditionFailed.ProtoReflect.Descriptor instead.
+func (*PreConditionFailed) Descriptor() ([]byte, []int) {
+	return file_messages_proto_rawDescGZIP(), []int{16}
+}
+
+func (x *PreConditionFailed) GetOperation() string {
+	if x != nil {
+		return x.Operation
+	}
+	return ""
+}
+
+func (x *PreConditionFailed) GetError() string {
+	if x != nil {
+		return x.Error
+	}
+	return ""
+}
+
+func (x *PreConditionFailed) GetInput() *anypb.Any {
+	if x != nil {
+		return x.Input
+	}
+	return nil
+}
+
 var File_messages_proto protoreflect.FileDescriptor
 
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 })
 
 var (
@@ -1249,32 +1407,36 @@ func file_messages_proto_rawDescGZIP() []byte {
 	return file_messages_proto_rawDescData
 }
 
-var file_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 15)
+var file_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 17)
 var file_messages_proto_goTypes = []any{
-	(*ClearCartRequest)(nil),    // 0: messages.ClearCartRequest
-	(*AddItem)(nil),             // 1: messages.AddItem
-	(*RemoveItem)(nil),          // 2: messages.RemoveItem
-	(*ChangeQuantity)(nil),      // 3: messages.ChangeQuantity
-	(*SetDelivery)(nil),         // 4: messages.SetDelivery
-	(*SetPickupPoint)(nil),      // 5: messages.SetPickupPoint
-	(*PickupPoint)(nil),         // 6: messages.PickupPoint
-	(*RemoveDelivery)(nil),      // 7: messages.RemoveDelivery
-	(*CreateCheckoutOrder)(nil), // 8: messages.CreateCheckoutOrder
-	(*OrderCreated)(nil),        // 9: messages.OrderCreated
-	(*Noop)(nil),                // 10: messages.Noop
-	(*InitializeCheckout)(nil),  // 11: messages.InitializeCheckout
-	(*VoucherRule)(nil),         // 12: messages.VoucherRule
-	(*AddVoucher)(nil),          // 13: messages.AddVoucher
-	(*RemoveVoucher)(nil),       // 14: messages.RemoveVoucher
+	(*ClearCartRequest)(nil),          // 0: messages.ClearCartRequest
+	(*AddItem)(nil),                   // 1: messages.AddItem
+	(*RemoveItem)(nil),                // 2: messages.RemoveItem
+	(*ChangeQuantity)(nil),            // 3: messages.ChangeQuantity
+	(*SetDelivery)(nil),               // 4: messages.SetDelivery
+	(*SetPickupPoint)(nil),            // 5: messages.SetPickupPoint
+	(*PickupPoint)(nil),               // 6: messages.PickupPoint
+	(*RemoveDelivery)(nil),            // 7: messages.RemoveDelivery
+	(*CreateCheckoutOrder)(nil),       // 8: messages.CreateCheckoutOrder
+	(*OrderCreated)(nil),              // 9: messages.OrderCreated
+	(*Noop)(nil),                      // 10: messages.Noop
+	(*InitializeCheckout)(nil),        // 11: messages.InitializeCheckout
+	(*InventoryReserved)(nil),         // 12: messages.InventoryReserved
+	(*AddVoucher)(nil),                // 13: messages.AddVoucher
+	(*RemoveVoucher)(nil),             // 14: messages.RemoveVoucher
+	(*UpsertSubscriptionDetails)(nil), // 15: messages.UpsertSubscriptionDetails
+	(*PreConditionFailed)(nil),        // 16: messages.PreConditionFailed
+	(*anypb.Any)(nil),                 // 17: google.protobuf.Any
 }
 var file_messages_proto_depIdxs = []int32{
 	6,  // 0: messages.SetDelivery.pickupPoint:type_name -> messages.PickupPoint
-	12, // 1: messages.AddVoucher.voucherRules:type_name -> messages.VoucherRule
-	2,  // [2:2] is the sub-list for method output_type
-	2,  // [2:2] is the sub-list for method input_type
-	2,  // [2:2] is the sub-list for extension type_name
-	2,  // [2:2] is the sub-list for extension extendee
-	0,  // [0:2] is the sub-list for field type_name
+	17, // 1: messages.UpsertSubscriptionDetails.data:type_name -> google.protobuf.Any
+	17, // 2: messages.PreConditionFailed.input:type_name -> google.protobuf.Any
+	3,  // [3:3] is the sub-list for method output_type
+	3,  // [3:3] is the sub-list for method input_type
+	3,  // [3:3] is the sub-list for extension type_name
+	3,  // [3:3] is the sub-list for extension extendee
+	0,  // [0:3] is the sub-list for field type_name
 }
 
 func init() { file_messages_proto_init() }
@@ -1286,13 +1448,15 @@ func file_messages_proto_init() {
 	file_messages_proto_msgTypes[4].OneofWrappers = []any{}
 	file_messages_proto_msgTypes[5].OneofWrappers = []any{}
 	file_messages_proto_msgTypes[6].OneofWrappers = []any{}
+	file_messages_proto_msgTypes[12].OneofWrappers = []any{}
+	file_messages_proto_msgTypes[15].OneofWrappers = []any{}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: unsafe.Slice(unsafe.StringData(file_messages_proto_rawDesc), len(file_messages_proto_rawDesc)),
 			NumEnums:      0,
-			NumMessages:   15,
+			NumMessages:   17,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

pkg/promotions/eval.go

@@ -0,0 +1,724 @@
+package promotions
+
+import (
+	"errors"
+	"fmt"
+	"slices"
+	"strings"
+	"time"
+
+	"git.tornberg.me/go-cart-actor/pkg/cart"
+)
+
+var errInvalidTimeFormat = errors.New("invalid time format")
+
+// Tracer allows callers to receive structured debug information during evaluation.
+type Tracer interface {
+	Trace(event string, data map[string]any)
+}
+
+// NoopTracer is used when no tracer provided.
+type NoopTracer struct{}
+
+func (NoopTracer) Trace(string, map[string]any) {}
+
+// PromotionItem is a lightweight abstraction derived from cart.CartItem
+// for the purpose of promotion condition evaluation.
+type PromotionItem struct {
+	SKU         string
+	Quantity    int
+	Category    string
+	PriceIncVat int64
+}
+
+// PromotionEvalContext carries all dynamic data required to evaluate promotion
+// conditions. It can be constructed from a cart.CartGrain plus optional
+// customer/order metadata.
+type PromotionEvalContext struct {
+	CartTotalIncVat       int64
+	TotalItemQuantity     int
+	Items                 []PromotionItem
+	CustomerSegment       string
+	CustomerLifetimeValue float64
+	OrderCount            int
+	Now                   time.Time
+}
+
+// ContextOption allows customization of fields when building a PromotionEvalContext.
+type ContextOption func(*PromotionEvalContext)
+
+// WithCustomerSegment sets the customer segment.
+func WithCustomerSegment(seg string) ContextOption {
+	return func(c *PromotionEvalContext) { c.CustomerSegment = seg }
+}
+
+// WithCustomerLifetimeValue sets lifetime value metric.
+func WithCustomerLifetimeValue(v float64) ContextOption {
+	return func(c *PromotionEvalContext) { c.CustomerLifetimeValue = v }
+}
+
+// WithOrderCount sets historical order count.
+func WithOrderCount(n int) ContextOption {
+	return func(c *PromotionEvalContext) { c.OrderCount = n }
+}
+
+// WithNow overrides the timestamp used for date/time related conditions.
+func WithNow(t time.Time) ContextOption {
+	return func(c *PromotionEvalContext) { c.Now = t }
+}
+
+// NewContextFromCart builds a PromotionEvalContext from a CartGrain and optional metadata.
+func NewContextFromCart(g *cart.CartGrain, opts ...ContextOption) *PromotionEvalContext {
+	ctx := &PromotionEvalContext{
+		Items:             make([]PromotionItem, 0, len(g.Items)),
+		CartTotalIncVat:   0,
+		TotalItemQuantity: 0,
+		Now:               time.Now(),
+	}
+	if g.TotalPrice != nil {
+		ctx.CartTotalIncVat = g.TotalPrice.IncVat
+	}
+	for _, it := range g.Items {
+		category := ""
+		if it.Meta != nil {
+			category = it.Meta.Category
+		}
+		ctx.Items = append(ctx.Items, PromotionItem{
+			SKU:         it.Sku,
+			Quantity:    it.Quantity,
+			Category:    strings.ToLower(category),
+			PriceIncVat: it.Price.IncVat,
+		})
+		ctx.TotalItemQuantity += it.Quantity
+	}
+	for _, o := range opts {
+		o(ctx)
+	}
+	return ctx
+}
+
+// PromotionService evaluates PromotionRules against a PromotionEvalContext.
+type PromotionService struct {
+	tracer Tracer
+}
+
+// NewPromotionService constructs a PromotionService with an optional tracer.
+func NewPromotionService(t Tracer) *PromotionService {
+	if t == nil {
+		t = NoopTracer{}
+	}
+	return &PromotionService{tracer: t}
+}
+
+// EvaluationResult holds the outcome of evaluating a single rule.
+type EvaluationResult struct {
+	Rule           PromotionRule
+	Applicable     bool
+	FailedReason   string
+	MatchedActions []Action
+}
+
+// EvaluateRule determines if a single PromotionRule applies to the provided context.
+// Returns an EvaluationResult with applicability and actions (if applicable).
+func (s *PromotionService) EvaluateRule(rule PromotionRule, ctx *PromotionEvalContext) EvaluationResult {
+	s.tracer.Trace("rule_start", map[string]any{
+		"rule_id":   rule.ID,
+		"priority":  rule.Priority,
+		"status":    rule.Status,
+		"startDate": rule.StartDate,
+		"endDate":   rule.EndDate,
+	})
+	// Status gate
+	now := ctx.Now
+	switch rule.Status {
+	case StatusInactive, StatusExpired:
+		s.tracer.Trace("rule_skip_status", map[string]any{"rule_id": rule.ID, "status": rule.Status})
+		return EvaluationResult{Rule: rule, Applicable: false, FailedReason: "status"}
+	case StatusScheduled:
+		// Allow scheduled only if current time >= startDate (and within endDate if present)
+	}
+	// Date window checks (if parseable)
+	if rule.StartDate != "" {
+		if tStart, err := parseDate(rule.StartDate); err == nil {
+			if now.Before(tStart) {
+				s.tracer.Trace("rule_skip_before_start", map[string]any{"rule_id": rule.ID})
+				return EvaluationResult{Rule: rule, Applicable: false, FailedReason: "before_start"}
+			}
+		}
+	}
+	if rule.EndDate != nil && *rule.EndDate != "" {
+		if tEnd, err := parseDate(*rule.EndDate); err == nil {
+			if now.After(tEnd.Add(23*time.Hour + 59*time.Minute + 59*time.Second)) { // inclusive day
+				s.tracer.Trace("rule_skip_after_end", map[string]any{"rule_id": rule.ID})
+				return EvaluationResult{Rule: rule, Applicable: false, FailedReason: "after_end"}
+			}
+		}
+	}
+	// Usage limit
+	if rule.UsageLimit != nil && rule.UsageCount >= *rule.UsageLimit {
+		s.tracer.Trace("rule_skip_usage_limit", map[string]any{"rule_id": rule.ID, "usageCount": rule.UsageCount, "limit": *rule.UsageLimit})
+		return EvaluationResult{Rule: rule, Applicable: false, FailedReason: "usage_limit_exhausted"}
+	}
+
+	if !evaluateConditionsTrace(rule.Conditions, ctx, s.tracer, rule.ID) {
+		s.tracer.Trace("rule_conditions_failed", map[string]any{"rule_id": rule.ID})
+		return EvaluationResult{Rule: rule, Applicable: false, FailedReason: "conditions"}
+	}
+
+	s.tracer.Trace("rule_applicable", map[string]any{"rule_id": rule.ID})
+	return EvaluationResult{
+		Rule:           rule,
+		Applicable:     true,
+		MatchedActions: rule.Actions,
+	}
+}
+
+// EvaluateAll returns all applicable promotion actions given a list of rules and context.
+// Rules marked Applicable are sorted by Priority (ascending: lower number = higher precedence).
+func (s *PromotionService) EvaluateAll(rules []PromotionRule, ctx *PromotionEvalContext) ([]EvaluationResult, []Action) {
+	results := make([]EvaluationResult, 0, len(rules))
+	for _, r := range rules {
+		res := s.EvaluateRule(r, ctx)
+		results = append(results, res)
+	}
+	actions := make([]Action, 0)
+	for _, res := range orderedByPriority(results) {
+		if res.Applicable {
+			s.tracer.Trace("actions_add", map[string]any{
+				"rule_id":  res.Rule.ID,
+				"count":    len(res.MatchedActions),
+				"priority": res.Rule.Priority,
+			})
+			actions = append(actions, res.MatchedActions...)
+		}
+	}
+	s.tracer.Trace("evaluation_complete", map[string]any{
+		"rules_total": len(rules),
+		"actions":     len(actions),
+	})
+	return results, actions
+}
+
+// orderedByPriority returns results sorted by PromotionRule.Priority ascending (stable).
+func orderedByPriority(in []EvaluationResult) []EvaluationResult {
+	out := make([]EvaluationResult, len(in))
+	copy(out, in)
+	for i := 1; i < len(out); i++ {
+		j := i
+		for j > 0 && out[j-1].Rule.Priority > out[j].Rule.Priority {
+			out[j-1], out[j] = out[j], out[j-1]
+			j--
+		}
+	}
+	return out
+}
+
+// ----------------------------
+// Condition evaluation (with tracing)
+// ----------------------------
+
+func evaluateConditionsTrace(conds Conditions, ctx *PromotionEvalContext, t Tracer, ruleID string) bool {
+	for idx, c := range conds {
+		if !evaluateConditionTrace(c, ctx, t, ruleID, fmt.Sprintf("root[%d]", idx)) {
+			return false
+		}
+	}
+	return true
+}
+
+func evaluateConditionTrace(c Condition, ctx *PromotionEvalContext, t Tracer, ruleID, path string) bool {
+	if grp, ok := c.(ConditionGroup); ok {
+		return evaluateGroupTrace(grp, ctx, t, ruleID, path)
+	}
+	bc, ok := c.(BaseCondition)
+	if !ok {
+		t.Trace("cond_invalid_type", map[string]any{"rule_id": ruleID, "path": path})
+		return false
+	}
+	res := evaluateBaseCondition(bc, ctx)
+	t.Trace("cond_base", map[string]any{
+		"rule_id": ruleID,
+		"path":    path,
+		"type":    bc.Type,
+		"op":      bc.Operator,
+		"value":   bc.Value.String(),
+		"result":  res,
+	})
+	return res
+}
+
+func evaluateGroupTrace(g ConditionGroup, ctx *PromotionEvalContext, t Tracer, ruleID, path string) bool {
+	op := normalizeLogicOperator(string(g.Operator))
+	if len(g.Conditions) == 0 {
+		t.Trace("cond_group_empty", map[string]any{"rule_id": ruleID, "path": path})
+		return true
+	}
+	if op == string(LogicAND) {
+		for i, child := range g.Conditions {
+			if !evaluateConditionTrace(child, ctx, t, ruleID, path+fmt.Sprintf(".AND[%d]", i)) {
+				t.Trace("cond_group_and_fail", map[string]any{"rule_id": ruleID, "path": path})
+				return false
+			}
+		}
+		t.Trace("cond_group_and_pass", map[string]any{"rule_id": ruleID, "path": path})
+		return true
+	}
+	for i, child := range g.Conditions {
+		if evaluateConditionTrace(child, ctx, t, ruleID, path+fmt.Sprintf(".OR[%d]", i)) {
+			t.Trace("cond_group_or_pass", map[string]any{"rule_id": ruleID, "path": path})
+			return true
+		}
+	}
+	t.Trace("cond_group_or_fail", map[string]any{"rule_id": ruleID, "path": path})
+	return false
+}
+
+// Fallback non-traced evaluation (used internally by traced path)
+func evaluateConditions(conds Conditions, ctx *PromotionEvalContext) bool {
+	for _, c := range conds {
+		if !evaluateCondition(c, ctx) {
+			return false
+		}
+	}
+	return true
+}
+
+func evaluateCondition(c Condition, ctx *PromotionEvalContext) bool {
+	if grp, ok := c.(ConditionGroup); ok {
+		return evaluateGroup(grp, ctx)
+	}
+	bc, ok := c.(BaseCondition)
+	if !ok {
+		return false
+	}
+	return evaluateBaseCondition(bc, ctx)
+}
+
+func evaluateGroup(g ConditionGroup, ctx *PromotionEvalContext) bool {
+	op := normalizeLogicOperator(string(g.Operator))
+	if len(g.Conditions) == 0 {
+		return true
+	}
+	if op == string(LogicAND) {
+		for _, child := range g.Conditions {
+			if !evaluateCondition(child, ctx) {
+				return false
+			}
+		}
+		return true
+	}
+	for _, child := range g.Conditions {
+		if evaluateCondition(child, ctx) {
+			return true
+		}
+	}
+	return false
+}
+
+func evaluateBaseCondition(b BaseCondition, ctx *PromotionEvalContext) bool {
+	switch b.Type {
+	case CondCartTotal:
+		return evalNumberCompare(float64(ctx.CartTotalIncVat), b)
+	case CondItemQuantity:
+		return evalNumberCompare(float64(ctx.TotalItemQuantity), b)
+	case CondCustomerSegment:
+		return evalStringCompare(ctx.CustomerSegment, b)
+	case CondProductCategory:
+		return evalAnyItemMatch(func(it PromotionItem) bool {
+			return evalValueAgainstTarget(strings.ToLower(it.Category), b)
+		}, b, ctx)
+	case CondProductID:
+		return evalAnyItemMatch(func(it PromotionItem) bool {
+			return evalValueAgainstTarget(strings.ToLower(it.SKU), b)
+		}, b, ctx)
+	case CondCustomerLifetime:
+		return evalNumberCompare(ctx.CustomerLifetimeValue, b)
+	case CondOrderCount:
+		return evalNumberCompare(float64(ctx.OrderCount), b)
+	case CondDateRange:
+		return evalDateRange(ctx.Now, b)
+	case CondDayOfWeek:
+		return evalDayOfWeek(ctx.Now, b)
+	case CondTimeOfDay:
+		return evalTimeOfDay(ctx.Now, b)
+	default:
+		return false
+	}
+}
+
+func evalAnyItemMatch(pred func(PromotionItem) bool, b BaseCondition, ctx *PromotionEvalContext) bool {
+	if slices.ContainsFunc(ctx.Items, pred) {
+		return true
+	}
+	switch normalizeOperator(string(b.Operator)) {
+	case string(OpNotIn), string(OpNotContains):
+		return true
+	}
+	return false
+}
+
+// ----------------------------
+// Primitive evaluators
+// ----------------------------
+
+func evalNumberCompare(target float64, b BaseCondition) bool {
+	op := normalizeOperator(string(b.Operator))
+	cond, ok := b.Value.AsFloat64()
+	if !ok {
+		if list, okL := b.Value.AsFloat64Slice(); okL && (op == string(OpIn) || op == string(OpNotIn)) {
+			found := sliceFloatContains(list, target)
+			if op == string(OpIn) {
+				return found
+			}
+			return !found
+		}
+		return false
+	}
+	switch op {
+	case string(OpEquals):
+		return target == cond
+	case string(OpNotEquals):
+		return target != cond
+	case string(OpGreaterThan):
+		return target > cond
+	case string(OpLessThan):
+		return target < cond
+	case string(OpGreaterOrEqual):
+		return target >= cond
+	case string(OpLessOrEqual):
+		return target <= cond
+	default:
+		return false
+	}
+}
+
+func evalStringCompare(target string, b BaseCondition) bool {
+	op := normalizeOperator(string(b.Operator))
+	targetLower := strings.ToLower(target)
+
+	if s, ok := b.Value.AsString(); ok {
+		condLower := strings.ToLower(s)
+		switch op {
+		case string(OpEquals):
+			return targetLower == condLower
+		case string(OpNotEquals):
+			return targetLower != condLower
+		case string(OpContains):
+			return strings.Contains(targetLower, condLower)
+		case string(OpNotContains):
+			return !strings.Contains(targetLower, condLower)
+		}
+	}
+
+	if arr, ok := b.Value.AsStringSlice(); ok {
+		switch op {
+		case string(OpIn):
+			for _, v := range arr {
+				if targetLower == strings.ToLower(v) {
+					return true
+				}
+			}
+			return false
+		case string(OpNotIn):
+			for _, v := range arr {
+				if targetLower == strings.ToLower(v) {
+					return false
+				}
+			}
+			return true
+		case string(OpContains):
+			for _, v := range arr {
+				if strings.Contains(targetLower, strings.ToLower(v)) {
+					return true
+				}
+			}
+			return false
+		case string(OpNotContains):
+			for _, v := range arr {
+				if strings.Contains(targetLower, strings.ToLower(v)) {
+					return false
+				}
+			}
+			return true
+		}
+	}
+
+	return false
+}
+
+func evalValueAgainstTarget(target string, b BaseCondition) bool {
+	op := normalizeOperator(string(b.Operator))
+	tLower := strings.ToLower(target)
+
+	if s, ok := b.Value.AsString(); ok {
+		vLower := strings.ToLower(s)
+		switch op {
+		case string(OpEquals):
+			return tLower == vLower
+		case string(OpNotEquals):
+			return tLower != vLower
+		case string(OpContains):
+			return strings.Contains(tLower, vLower)
+		case string(OpNotContains):
+			return !strings.Contains(tLower, vLower)
+		case string(OpIn):
+			return tLower == vLower
+		case string(OpNotIn):
+			return tLower != vLower
+		}
+	}
+
+	if list, ok := b.Value.AsStringSlice(); ok {
+		found := false
+		for _, v := range list {
+			if tLower == strings.ToLower(v) {
+				found = true
+				break
+			}
+		}
+		switch op {
+		case string(OpIn):
+			return found
+		case string(OpNotIn):
+			return !found
+		case string(OpContains):
+			for _, v := range list {
+				if strings.Contains(tLower, strings.ToLower(v)) {
+					return true
+				}
+			}
+			return false
+		case string(OpNotContains):
+			for _, v := range list {
+				if strings.Contains(tLower, strings.ToLower(v)) {
+					return false
+				}
+			}
+			return true
+		}
+	}
+
+	return false
+}
+
+func evalDateRange(now time.Time, b BaseCondition) bool {
+	var start, end time.Time
+	if ss, ok := b.Value.AsStringSlice(); ok && len(ss) == 2 {
+		t0, e0 := parseDate(ss[0])
+		t1, e1 := parseDate(ss[1])
+		if e0 != nil || e1 != nil {
+			return false
+		}
+		start, end = t0, t1
+	} else if s, ok := b.Value.AsString(); ok {
+		parts := strings.Split(s, "..")
+		if len(parts) != 2 {
+			return false
+		}
+		t0, e0 := parseDate(parts[0])
+		t1, e1 := parseDate(parts[1])
+		if e0 != nil || e1 != nil {
+			return false
+		}
+		start, end = t0, t1
+	} else {
+		return false
+	}
+	endInclusive := end.Add(23*time.Hour + 59*time.Minute + 59*time.Second)
+	return (now.Equal(start) || now.After(start)) && (now.Equal(endInclusive) || now.Before(endInclusive))
+}
+
+func evalDayOfWeek(now time.Time, b BaseCondition) bool {
+	dow := int(now.Weekday())
+	allowed := make(map[int]struct{})
+	if arr, ok := b.Value.AsStringSlice(); ok {
+		for _, v := range arr {
+			if idx, ok := parseDayOfWeek(v); ok {
+				allowed[idx] = struct{}{}
+			}
+		}
+	} else if s, ok := b.Value.AsString(); ok {
+		for _, part := range strings.Split(s, "|") {
+			if idx, ok := parseDayOfWeek(strings.TrimSpace(part)); ok {
+				allowed[idx] = struct{}{}
+			}
+		}
+	} else {
+		return false
+	}
+
+	if len(allowed) == 0 {
+		return false
+	}
+	op := normalizeOperator(string(b.Operator))
+	_, present := allowed[dow]
+	if op == string(OpIn) || op == string(OpEquals) || op == "" {
+		return present
+	}
+	if op == string(OpNotIn) || op == string(OpNotEquals) {
+		return !present
+	}
+	return present
+}
+
+func evalTimeOfDay(now time.Time, b BaseCondition) bool {
+	var startMin, endMin int
+	if arr, ok := b.Value.AsStringSlice(); ok && len(arr) == 2 {
+		s0, e0 := parseClock(arr[0])
+		s1, e1 := parseClock(arr[1])
+		if e0 != nil || e1 != nil {
+			return false
+		}
+		startMin, endMin = s0, s1
+	} else if s, ok := b.Value.AsString(); ok {
+		parts := strings.Split(s, "-")
+		if len(parts) != 2 {
+			return false
+		}
+		s0, e0 := parseClock(parts[0])
+		s1, e1 := parseClock(parts[1])
+		if e0 != nil || e1 != nil {
+			return false
+		}
+		startMin, endMin = s0, s1
+	} else {
+		return false
+	}
+	todayMin := now.Hour()*60 + now.Minute()
+	if startMin > endMin {
+		return todayMin >= startMin || todayMin <= endMin
+	}
+	return todayMin >= startMin && todayMin <= endMin
+}
+
+// ----------------------------
+// Parsing helpers
+// ----------------------------
+
+func parseDate(s string) (time.Time, error) {
+	layouts := []string{
+		"2006-01-02",
+		time.RFC3339,
+		"2006-01-02T15:04:05Z07:00",
+	}
+	for _, l := range layouts {
+		if t, err := time.Parse(l, strings.TrimSpace(s)); err == nil {
+			return t, nil
+		}
+	}
+	return time.Time{}, errInvalidTimeFormat
+}
+
+func parseDayOfWeek(s string) (int, bool) {
+	sl := strings.ToLower(strings.TrimSpace(s))
+	switch sl {
+	case "sun", "sunday", "0":
+		return 0, true
+	case "mon", "monday", "1":
+		return 1, true
+	case "tue", "tues", "tuesday", "2":
+		return 2, true
+	case "wed", "weds", "wednesday", "3":
+		return 3, true
+	case "thu", "thur", "thurs", "thursday", "4":
+		return 4, true
+	case "fri", "friday", "5":
+		return 5, true
+	case "sat", "saturday", "6":
+		return 6, true
+	default:
+		return 0, false
+	}
+}
+
+func parseClock(s string) (int, error) {
+	s = strings.TrimSpace(s)
+	parts := strings.Split(s, ":")
+	if len(parts) != 2 {
+		return 0, errInvalidTimeFormat
+	}
+	h, err := parsePositiveInt(parts[0])
+	if err != nil {
+		return 0, err
+	}
+	m, err := parsePositiveInt(parts[1])
+	if err != nil {
+		return 0, err
+	}
+	if h < 0 || h > 23 || m < 0 || m > 59 {
+		return 0, errInvalidTimeFormat
+	}
+	return h*60 + m, nil
+}
+
+func parsePositiveInt(s string) (int, error) {
+	n := 0
+	for _, r := range s {
+		if r < '0' || r > '9' {
+			return 0, errInvalidTimeFormat
+		}
+		n = n*10 + int(r-'0')
+	}
+	return n, nil
+}
+
+func normalizeOperator(op string) string {
+	o := strings.ToLower(strings.TrimSpace(op))
+	switch o {
+	case "=", "equals", "eq":
+		return string(OpEquals)
+	case "!=", "not_equals", "neq":
+		return string(OpNotEquals)
+	case ">", "greater_than", "gt":
+		return string(OpGreaterThan)
+	case "<", "less_than", "lt":
+		return string(OpLessThan)
+	case ">=", "greater_or_equal", "ge", "gte":
+		return string(OpGreaterOrEqual)
+	case "<=", "less_or_equal", "le", "lte":
+		return string(OpLessOrEqual)
+	case "contains":
+		return string(OpContains)
+	case "not_contains":
+		return string(OpNotContains)
+	case "in":
+		return string(OpIn)
+	case "not_in":
+		return string(OpNotIn)
+	default:
+		return o
+	}
+}
+
+func normalizeLogicOperator(op string) string {
+	o := strings.ToLower(strings.TrimSpace(op))
+	switch o {
+	case "&&", "and":
+		return string(LogicAND)
+	case "||", "or":
+		return string(LogicOR)
+	default:
+		return o
+	}
+}
+
+func sliceFloatContains(list []float64, v float64) bool {
+	return slices.Contains(list, v)
+}
+
+// ----------------------------
+// Potential extension hooks
+// ----------------------------
+//
+// Future ideas:
+//   - Conflict resolution strategies (e.g., best discount wins, stackable tags)
+//   - Action transformation (e.g., applying tiered logic or bundles carefully)
+//   - Recording evaluation traces for debugging / analytics.
+//   - Tracing instrumentation for condition evaluation.
+//
+// These can be integrated by adding strategy interfaces or injecting evaluators
+// into PromotionService.
+//
+// ----------------------------
+// End of file
+// ----------------------------

pkg/promotions/eval_test.go

@@ -0,0 +1,448 @@
+package promotions
+
+import (
+	"encoding/json"
+	"slices"
+	"testing"
+	"time"
+
+	"git.tornberg.me/go-cart-actor/pkg/cart"
+)
+
+// --- Helpers ---------------------------------------------------------------
+
+func cvNum(n float64) ConditionValue {
+	b, _ := json.Marshal(n)
+	return ConditionValue{Raw: b}
+}
+
+func cvString(s string) ConditionValue {
+	b, _ := json.Marshal(s)
+	return ConditionValue{Raw: b}
+}
+
+func cvStrings(ss []string) ConditionValue {
+	b, _ := json.Marshal(ss)
+	return ConditionValue{Raw: b}
+}
+
+// testTracer captures trace events for assertions.
+type testTracer struct {
+	events []traceEvent
+}
+
+type traceEvent struct {
+	event string
+	data  map[string]any
+}
+
+func (t *testTracer) Trace(event string, data map[string]any) {
+	t.events = append(t.events, traceEvent{event: event, data: data})
+}
+
+func (t *testTracer) HasEvent(name string) bool {
+	return slices.ContainsFunc(t.events, func(e traceEvent) bool { return e.event == name })
+}
+
+func (t *testTracer) Count(name string) int {
+	c := 0
+	for _, e := range t.events {
+		if e.event == name {
+			c++
+		}
+	}
+	return c
+}
+
+// makeCart creates a cart with given total and items (each item quantity & price IncVat).
+func makeCart(totalOverride int64, items []struct {
+	sku      string
+	category string
+	qty      int
+	priceInc int64
+}) *cart.CartGrain {
+	g := cart.NewCartGrain(1, time.Now())
+	for _, it := range items {
+		p := cart.NewPriceFromIncVat(it.priceInc, 0.25)
+		g.Items = append(g.Items, &cart.CartItem{
+			Id:    uint32(len(g.Items) + 1),
+			Sku:   it.sku,
+			Price: *p,
+			TotalPrice: cart.Price{
+				IncVat:   p.IncVat * int64(it.qty),
+				VatRates: p.VatRates,
+			},
+			Quantity: it.qty,
+			Meta: &cart.ItemMeta{
+				Category: it.category,
+			},
+		})
+	}
+	// Recalculate totals
+	g.UpdateTotals()
+	if totalOverride >= 0 {
+		g.TotalPrice.IncVat = totalOverride
+	}
+	return g
+}
+
+// --- Tests -----------------------------------------------------------------
+
+func TestEvaluateRuleBasicAND(t *testing.T) {
+	g := makeCart(12000, []struct {
+		sku      string
+		category string
+		qty      int
+		priceInc int64
+	}{
+		{"SKU-1", "summer", 2, 3000},
+		{"SKU-2", "winter", 1, 6000},
+	})
+
+	ctx := NewContextFromCart(g,
+		WithCustomerSegment("vip"),
+		WithOrderCount(10),
+		WithCustomerLifetimeValue(1234.56),
+		WithNow(time.Date(2024, 6, 10, 12, 0, 0, 0, time.UTC)),
+	)
+
+	// Conditions: cart_total >= 10000 AND item_quantity >= 3 AND customer_segment = vip
+	conds := Conditions{
+		ConditionGroup{
+			ID:       "grp",
+			Type:     "group",
+			Operator: LogicAND,
+			Conditions: Conditions{
+				BaseCondition{
+					ID:       "c_cart_total",
+					Type:     CondCartTotal,
+					Operator: OpGreaterOrEqual,
+					Value:    cvNum(10000),
+				},
+				BaseCondition{
+					ID:       "c_item_qty",
+					Type:     CondItemQuantity,
+					Operator: OpGreaterOrEqual,
+					Value:    cvNum(3),
+				},
+				BaseCondition{
+					ID:       "c_segment",
+					Type:     CondCustomerSegment,
+					Operator: OpEquals,
+					Value:    cvString("vip"),
+				},
+			},
+		},
+	}
+
+	rule := PromotionRule{
+		ID:          "rule-AND",
+		Name:        "VIP Summer",
+		Description: "Test rule",
+		Status:      StatusActive,
+		Priority:    1,
+		StartDate:   "2024-06-01",
+		EndDate:     ptr("2024-06-30"),
+		Conditions:  conds,
+		Actions: []Action{
+			{ID: "a1", Type: ActionPercentageDiscount, Value: 10.0},
+		},
+		UsageLimit: ptrInt(100),
+		UsageCount: 5,
+		CreatedAt:  time.Now().Format(time.RFC3339),
+		UpdatedAt:  time.Now().Format(time.RFC3339),
+		CreatedBy:  "tester",
+	}
+
+	tracer := &testTracer{}
+	svc := NewPromotionService(tracer)
+	res := svc.EvaluateRule(rule, ctx)
+	if !res.Applicable {
+		t.Fatalf("expected rule to be applicable, failedReason=%s", res.FailedReason)
+	}
+	if len(res.MatchedActions) != 1 {
+		t.Fatalf("expected 1 action, got %d", len(res.MatchedActions))
+	}
+	if !tracer.HasEvent("rule_applicable") {
+		t.Errorf("expected tracing event rule_applicable")
+	}
+}
+
+func TestEvaluateRuleUsageLimitExhausted(t *testing.T) {
+	rule := PromotionRule{
+		ID:         "limit",
+		Name:       "Limit",
+		Status:     StatusActive,
+		Priority:   1,
+		StartDate:  "2024-01-01",
+		EndDate:    nil,
+		Conditions: Conditions{},
+		UsageLimit: ptrInt(5),
+		UsageCount: 5,
+	}
+
+	ctx := &PromotionEvalContext{Now: time.Date(2024, 2, 1, 0, 0, 0, 0, time.UTC)}
+	tracer := &testTracer{}
+	svc := NewPromotionService(tracer)
+	res := svc.EvaluateRule(rule, ctx)
+	if res.Applicable {
+		t.Fatalf("expected rule NOT applicable due to usage limit")
+	}
+	if res.FailedReason != "usage_limit_exhausted" {
+		t.Fatalf("expected failedReason usage_limit_exhausted, got %s", res.FailedReason)
+	}
+	if !tracer.HasEvent("rule_skip_usage_limit") {
+		t.Errorf("tracer missing rule_skip_usage_limit event")
+	}
+}
+
+func TestEvaluateRuleDateWindow(t *testing.T) {
+	// Start in future
+	rule := PromotionRule{
+		ID:         "date",
+		Name:       "DateWindow",
+		Status:     StatusActive,
+		Priority:   1,
+		StartDate:  "2025-01-01",
+		EndDate:    ptr("2025-01-31"),
+		Conditions: Conditions{},
+	}
+	ctx := &PromotionEvalContext{Now: time.Date(2024, 12, 15, 12, 0, 0, 0, time.UTC)}
+	tracer := &testTracer{}
+	svc := NewPromotionService(tracer)
+	res := svc.EvaluateRule(rule, ctx)
+	if res.Applicable {
+		t.Fatalf("expected rule NOT applicable (before start)")
+	}
+	if res.FailedReason != "before_start" {
+		t.Fatalf("expected failedReason before_start, got %s", res.FailedReason)
+	}
+	if !tracer.HasEvent("rule_skip_before_start") {
+		t.Errorf("missing rule_skip_before_start trace event")
+	}
+}
+
+func TestEvaluateProductCategoryIN(t *testing.T) {
+	g := makeCart(-1, []struct {
+		sku      string
+		category string
+		qty      int
+		priceInc int64
+	}{
+		{"A", "shoes", 1, 5000},
+		{"B", "bags", 1, 7000},
+	})
+
+	ctx := NewContextFromCart(g)
+	conds := Conditions{
+		BaseCondition{
+			ID:       "c_category",
+			Type:     CondProductCategory,
+			Operator: OpIn,
+			Value:    cvStrings([]string{"shoes", "hats"}),
+		},
+	}
+	rule := PromotionRule{
+		ID:         "cat-in",
+		Status:     StatusActive,
+		Priority:   10,
+		StartDate:  "2024-01-01",
+		EndDate:    nil,
+		Conditions: conds,
+		Actions: []Action{
+			{ID: "discount", Type: ActionFixedDiscount, Value: 1000},
+		},
+	}
+	tracer := &testTracer{}
+	svc := NewPromotionService(tracer)
+	res := svc.EvaluateRule(rule, ctx)
+	if !res.Applicable {
+		t.Fatalf("expected category IN rule to apply")
+	}
+	if !tracer.HasEvent("rule_applicable") {
+		t.Errorf("tracing missing rule_applicable")
+	}
+}
+
+func TestEvaluateGroupOR(t *testing.T) {
+	g := makeCart(3000, []struct {
+		sku      string
+		category string
+		qty      int
+		priceInc int64
+	}{
+		{"ONE", "x", 1, 3000},
+	})
+
+	ctx := NewContextFromCart(g)
+
+	// OR group: (cart_total >= 10000) OR (item_quantity >= 1)
+	group := ConditionGroup{
+		ID:       "grp-or",
+		Type:     "group",
+		Operator: LogicOR,
+		Conditions: Conditions{
+			BaseCondition{
+				ID:       "c_total",
+				Type:     CondCartTotal,
+				Operator: OpGreaterOrEqual,
+				Value:    cvNum(10000),
+			},
+			BaseCondition{
+				ID:       "c_qty",
+				Type:     CondItemQuantity,
+				Operator: OpGreaterOrEqual,
+				Value:    cvNum(1),
+			},
+		},
+	}
+	rule := PromotionRule{
+		ID:         "or-rule",
+		Status:     StatusActive,
+		Priority:   5,
+		StartDate:  "2024-01-01",
+		EndDate:    nil,
+		Conditions: Conditions{group},
+		Actions:    []Action{{ID: "a", Type: ActionFixedDiscount, Value: 500}},
+	}
+	tracer := &testTracer{}
+	svc := NewPromotionService(tracer)
+	res := svc.EvaluateRule(rule, ctx)
+	if !res.Applicable {
+		t.Fatalf("expected OR rule to apply (second condition true)")
+	}
+	// Ensure group pass event
+	if !tracer.HasEvent("cond_group_or_pass") {
+		t.Errorf("expected cond_group_or_pass trace event")
+	}
+}
+
+func TestEvaluateAllPriorityOrdering(t *testing.T) {
+	ctx := &PromotionEvalContext{
+		CartTotalIncVat:   20000,
+		TotalItemQuantity: 2,
+		Items: []PromotionItem{
+			{SKU: "X", Quantity: 2, Category: "general", PriceIncVat: 10000},
+		},
+		Now: time.Date(2024, 5, 10, 10, 0, 0, 0, time.UTC),
+	}
+
+	// Rule A: priority 5
+	ruleA := PromotionRule{
+		ID:         "A",
+		Status:     StatusActive,
+		Priority:   5,
+		StartDate:  "2024-01-01",
+		EndDate:    nil,
+		Conditions: Conditions{},
+		Actions: []Action{
+			{ID: "actionA", Type: ActionFixedDiscount, Value: 100},
+		},
+	}
+
+	// Rule B: priority 1
+	ruleB := PromotionRule{
+		ID:         "B",
+		Status:     StatusActive,
+		Priority:   1,
+		StartDate:  "2024-01-01",
+		EndDate:    nil,
+		Conditions: Conditions{},
+		Actions: []Action{
+			{ID: "actionB", Type: ActionFixedDiscount, Value: 200},
+		},
+	}
+
+	tracer := &testTracer{}
+	svc := NewPromotionService(tracer)
+	results, actions := svc.EvaluateAll([]PromotionRule{ruleA, ruleB}, ctx)
+	if len(results) != 2 {
+		t.Fatalf("expected 2 results, got %d", len(results))
+	}
+	if len(actions) != 2 {
+		t.Fatalf("expected 2 actions, got %d", len(actions))
+	}
+
+	// Actions should follow priority order: ruleB (1) then ruleA (5)
+	if actions[0].ID != "actionB" || actions[1].ID != "actionA" {
+		t.Fatalf("actions order invalid: %+v", actions)
+	}
+	if tracer.Count("actions_add") != 2 {
+		t.Errorf("expected 2 actions_add trace events, got %d", tracer.Count("actions_add"))
+	}
+	if !tracer.HasEvent("evaluation_complete") {
+		t.Errorf("missing evaluation_complete trace")
+	}
+}
+
+func TestDayOfWeekAndTimeOfDay(t *testing.T) {
+	// Wednesday 14:30 UTC
+	now := time.Date(2024, 6, 12, 14, 30, 0, 0, time.UTC) // 2024-06-12 is Wednesday
+	ctx := &PromotionEvalContext{
+		Now: now,
+	}
+
+	condDay := BaseCondition{
+		ID:       "dow",
+		Type:     CondDayOfWeek,
+		Operator: OpIn,
+		Value:    cvStrings([]string{"wed", "fri"}),
+	}
+	condTime := BaseCondition{
+		ID:       "tod",
+		Type:     CondTimeOfDay,
+		Operator: OpEquals, // operator is ignored for time-of-day internally
+		Value:    cvString("13:00-15:00"),
+	}
+
+	rule := PromotionRule{
+		ID:         "day-time",
+		Status:     StatusActive,
+		Priority:   1,
+		StartDate:  "2024-01-01",
+		EndDate:    nil,
+		Conditions: Conditions{condDay, condTime},
+		Actions:    []Action{{ID: "a", Type: ActionPercentageDiscount, Value: 15}},
+	}
+
+	tracer := &testTracer{}
+	svc := NewPromotionService(tracer)
+	res := svc.EvaluateRule(rule, ctx)
+	if !res.Applicable {
+		t.Fatalf("expected rule to apply for Wednesday 14:30 in window 13-15")
+	}
+}
+
+func TestDateRangeCondition(t *testing.T) {
+	now := time.Date(2024, 3, 15, 9, 0, 0, 0, time.UTC)
+	ctx := &PromotionEvalContext{Now: now}
+
+	condRange := BaseCondition{
+		ID:       "date_range",
+		Type:     CondDateRange,
+		Operator: OpEquals, // not used
+		Value:    cvStrings([]string{"2024-03-01", "2024-03-31"}),
+	}
+
+	rule := PromotionRule{
+		ID:         "range",
+		Status:     StatusActive,
+		Priority:   1,
+		StartDate:  "2024-01-01",
+		EndDate:    nil,
+		Conditions: Conditions{condRange},
+		Actions:    []Action{{ID: "a", Type: ActionFixedDiscount, Value: 500}},
+	}
+
+	tracer := &testTracer{}
+	svc := NewPromotionService(tracer)
+	res := svc.EvaluateRule(rule, ctx)
+	if !res.Applicable {
+		t.Fatalf("expected date range rule to apply for 2024-03-15")
+	}
+}
+
+// --- Utilities -------------------------------------------------------------
+
+func ptr(s string) *string { return &s }
+func ptrInt(i int) *int    { return &i }

pkg/promotions/type_test.go

@@ -0,0 +1,443 @@
+package promotions
+
+import (
+	"encoding/json"
+	"testing"
+)
+
+// sampleJSON mirrors the user's full example data (all three rules)
+var sampleJSON = []byte(`[
+  {
+    "id": "1",
+    "name": "Summer Sale 2024",
+    "description": "20% off on all summer items",
+    "status": "active",
+    "priority": 1,
+    "startDate": "2024-06-01",
+    "endDate": "2024-08-31",
+    "conditions": [
+      {
+        "id": "group1",
+        "type": "group",
+        "operator": "AND",
+        "conditions": [
+          {
+            "id": "c1",
+            "type": "product_category",
+            "operator": "in",
+            "value": ["summer", "beachwear"],
+            "label": "Product category is Summer or Beachwear"
+          },
+          {
+            "id": "c2",
+            "type": "cart_total",
+            "operator": "greater_or_equal",
+            "value": 50,
+            "label": "Cart total is at least $50"
+          }
+        ]
+      }
+    ],
+    "actions": [
+      {
+        "id": "a1",
+        "type": "percentage_discount",
+        "value": 20,
+        "label": "20% discount"
+      }
+    ],
+    "usageLimit": 1000,
+    "usageCount": 342,
+    "createdAt": "2024-05-15T10:00:00Z",
+    "updatedAt": "2024-05-20T14:30:00Z",
+    "createdBy": "admin@example.com",
+    "tags": ["seasonal", "summer"]
+  },
+  {
+    "id": "2",
+    "name": "VIP Customer Exclusive",
+    "description": "Free shipping for VIP customers",
+    "status": "active",
+    "priority": 2,
+    "startDate": "2024-01-01",
+    "endDate": null,
+    "conditions": [
+      {
+        "id": "c3",
+        "type": "customer_segment",
+        "operator": "equals",
+        "value": "vip",
+        "label": "Customer segment is VIP"
+      }
+    ],
+    "actions": [
+      {
+        "id": "a2",
+        "type": "free_shipping",
+        "value": 0,
+        "label": "Free shipping"
+      }
+    ],
+    "usageCount": 1523,
+    "createdAt": "2023-12-15T09:00:00Z",
+    "updatedAt": "2024-01-05T11:20:00Z",
+    "createdBy": "marketing@example.com",
+    "tags": ["vip", "loyalty"]
+  },
+  {
+    "id": "3",
+    "name": "Buy 2 Get 1 Free",
+    "description": "Buy 2 items, get the cheapest one free",
+    "status": "scheduled",
+    "priority": 3,
+    "startDate": "2024-12-01",
+    "endDate": "2024-12-25",
+    "conditions": [
+      {
+        "id": "c4",
+        "type": "item_quantity",
+        "operator": "greater_or_equal",
+        "value": 3,
+        "label": "Cart has at least 3 items"
+      }
+    ],
+    "actions": [
+      {
+        "id": "a3",
+        "type": "buy_x_get_y",
+        "value": 0,
+        "config": { "buy": 2, "get": 1, "discount": 100 },
+        "label": "Buy 2 Get 1 Free"
+      }
+    ],
+    "usageCount": 0,
+    "createdAt": "2024-11-01T08:00:00Z",
+    "updatedAt": "2024-11-01T08:00:00Z",
+    "createdBy": "admin@example.com",
+    "tags": ["holiday", "christmas"]
+  }
+]`)
+
+func TestDecodePromotionRulesBasic(t *testing.T) {
+	rules, err := DecodePromotionRules(sampleJSON)
+	if err != nil {
+		t.Fatalf("DecodePromotionRules failed: %v", err)
+	}
+	if len(rules) != 3 {
+		t.Fatalf("expected 3 rules, got %d", len(rules))
+	}
+
+	// Rule 1 checks
+	r1 := rules[0]
+	if r1.ID != "1" {
+		t.Errorf("rule[0].ID = %s, want 1", r1.ID)
+	}
+	if r1.Status != StatusActive {
+		t.Errorf("rule[0].Status = %s, want %s", r1.Status, StatusActive)
+	}
+	if r1.EndDate == nil || *r1.EndDate != "2024-08-31" {
+		t.Errorf("rule[0].EndDate = %v, want 2024-08-31", r1.EndDate)
+	}
+	if r1.UsageLimit == nil || *r1.UsageLimit != 1000 {
+		t.Errorf("rule[0].UsageLimit = %v, want 1000", r1.UsageLimit)
+	}
+
+	// Rule 2 checks
+	r2 := rules[1]
+	if r2.ID != "2" {
+		t.Errorf("rule[1].ID = %s, want 2", r2.ID)
+	}
+	if r2.EndDate != nil {
+		t.Errorf("rule[1].EndDate should be nil (from null), got %v", *r2.EndDate)
+	}
+	if r2.UsageLimit != nil {
+		t.Errorf("rule[1].UsageLimit should be nil (missing), got %v", *r2.UsageLimit)
+	}
+}
+
+func TestConditionDecoding(t *testing.T) {
+	rules, err := DecodePromotionRules(sampleJSON)
+	if err != nil {
+		t.Fatalf("DecodePromotionRules failed: %v", err)
+	}
+	r1 := rules[0]
+	if len(r1.Conditions) != 1 {
+		t.Fatalf("expected 1 top-level condition group, got %d", len(r1.Conditions))
+	}
+
+	grp, ok := r1.Conditions[0].(ConditionGroup)
+	if !ok {
+		t.Fatalf("top-level condition is not a group, type=%T", r1.Conditions[0])
+	}
+	if grp.Operator != LogicAND {
+		t.Errorf("group operator = %s, want AND", grp.Operator)
+	}
+
+	if len(grp.Conditions) != 2 {
+		t.Fatalf("expected 2 child conditions, got %d", len(grp.Conditions))
+	}
+
+	// First child: product_category condition with slice value
+	c0, ok := grp.Conditions[0].(BaseCondition)
+	if !ok {
+		t.Fatalf("first child not BaseCondition, got %T", grp.Conditions[0])
+	}
+	if c0.Type != CondProductCategory {
+		t.Errorf("first child type = %s, want %s", c0.Type, CondProductCategory)
+	}
+	if c0.Operator != OpIn {
+		t.Errorf("first child operator = %s, want %s", c0.Operator, OpIn)
+	}
+	if arr, ok := c0.Value.AsStringSlice(); !ok || len(arr) != 2 || arr[0] != "summer" {
+		t.Errorf("expected string slice value [summer,...], got %v", arr)
+	}
+
+	// Second child: cart_total numeric
+	c1, ok := grp.Conditions[1].(BaseCondition)
+	if !ok {
+		t.Fatalf("second child not BaseCondition, got %T", grp.Conditions[1])
+	}
+	if c1.Type != CondCartTotal {
+		t.Errorf("second child type = %s, want %s", c1.Type, CondCartTotal)
+	}
+	if val, ok := c1.Value.AsFloat64(); !ok || val != 50 {
+		t.Errorf("expected numeric value 50, got %v (ok=%v)", val, ok)
+	}
+}
+
+func TestConditionValueHelpers(t *testing.T) {
+	tests := []struct {
+		name    string
+		jsonVal string
+		wantStr string
+		wantNum *float64
+		wantSS  []string
+		wantFS  []float64
+	}{
+		{
+			name:    "string value",
+			jsonVal: `"vip"`,
+			wantStr: "vip",
+		},
+		{
+			name:    "number value",
+			jsonVal: `42`,
+			wantNum: floatPtr(42),
+		},
+		{
+			name:    "string slice",
+			jsonVal: `["a","b"]`,
+			wantSS:  []string{"a", "b"},
+		},
+		{
+			name:    "number slice int",
+			jsonVal: `[1,2,3]`,
+			wantFS:  []float64{1, 2, 3},
+		},
+		{
+			name:    "number slice float",
+			jsonVal: `[1.5,2.25]`,
+			wantFS:  []float64{1.5, 2.25},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			var cv ConditionValue
+			if err := json.Unmarshal([]byte(tc.jsonVal), &cv); err != nil {
+				t.Fatalf("unmarshal value failed: %v", err)
+			}
+			if tc.wantStr != "" {
+				if got, ok := cv.AsString(); !ok || got != tc.wantStr {
+					t.Errorf("AsString got=%q ok=%v want=%q", got, ok, tc.wantStr)
+				}
+			}
+			if tc.wantNum != nil {
+				if got, ok := cv.AsFloat64(); !ok || got != *tc.wantNum {
+					t.Errorf("AsFloat64 got=%v ok=%v want=%v", got, ok, *tc.wantNum)
+				}
+			}
+			if tc.wantSS != nil {
+				if got, ok := cv.AsStringSlice(); !ok || len(got) != len(tc.wantSS) || got[0] != tc.wantSS[0] {
+					t.Errorf("AsStringSlice got=%v ok=%v want=%v", got, ok, tc.wantSS)
+				}
+			}
+			if tc.wantFS != nil {
+				if got, ok := cv.AsFloat64Slice(); !ok || len(got) != len(tc.wantFS) {
+					t.Errorf("AsFloat64Slice got=%v ok=%v want=%v", got, ok, tc.wantFS)
+				} else {
+					for i := range got {
+						if got[i] != tc.wantFS[i] {
+							t.Errorf("AsFloat64Slice[%d]=%v want=%v", i, got[i], tc.wantFS[i])
+						}
+					}
+				}
+			}
+		})
+	}
+}
+
+func TestWalkConditionsTraversal(t *testing.T) {
+	rules, err := DecodePromotionRules(sampleJSON)
+	if err != nil {
+		t.Fatalf("DecodePromotionRules failed: %v", err)
+	}
+	visited := 0
+	WalkConditions(rules[0].Conditions, func(c Condition) bool {
+		visited++
+		return true
+	})
+	// group + 2 children
+	if visited != 3 {
+		t.Errorf("expected 3 visited conditions, got %d", visited)
+	}
+}
+
+func TestActionBundleConfigParsing(t *testing.T) {
+	jsonData := []byte(`[
+	  {
+	    "id": "bundle-1",
+	    "name": "Bundle Deal",
+	    "description": "Fixed price bundle",
+	    "status": "active",
+	    "priority": 1,
+	    "startDate": "2024-01-01",
+	    "endDate": null,
+	    "conditions": [],
+	    "actions": [
+	      {
+	        "id": "act-bundle",
+	        "type": "bundle_discount",
+	        "value": 0,
+	        "bundleConfig": {
+	          "containers": [
+	            {
+	              "id": "cont1",
+	              "name": "Shoes",
+	              "quantity": 2,
+	              "selectionType": "any",
+	              "qualifyingRules": {
+	                "type": "category",
+	                "value": "shoes"
+	              }
+	            },
+	            {
+	              "id": "cont2",
+	              "name": "Socks",
+	              "quantity": 3,
+	              "selectionType": "specific",
+	              "qualifyingRules": {
+	                "type": "product_ids",
+	                "value": ["sock-1", "sock-2"]
+	              },
+	              "allowedProducts": ["sock-1","sock-2"]
+	            }
+	          ],
+	          "pricing": {
+	            "type": "fixed_price",
+	            "value": 49.99
+	          },
+	          "requireAllContainers": true
+	        },
+	        "config": { "note": "Bundle applies to footwear + socks" }
+	      }
+	    ],
+	    "usageCount": 0,
+	    "createdAt": "2024-01-01T00:00:00Z",
+	    "updatedAt": "2024-01-01T00:00:00Z",
+	    "createdBy": "bundle@example.com",
+	    "tags": ["bundle","footwear"]
+	  }
+	]`)
+	rules, err := DecodePromotionRules(jsonData)
+	if err != nil {
+		t.Fatalf("decode failed: %v", err)
+	}
+	if len(rules) != 1 {
+		t.Fatalf("expected 1 rule, got %d", len(rules))
+	}
+	if len(rules[0].Actions) != 1 {
+		t.Fatalf("expected 1 action, got %d", len(rules[0].Actions))
+	}
+	act := rules[0].Actions[0]
+	if act.Type != ActionBundleDiscount {
+		t.Fatalf("action type = %s, want %s", act.Type, ActionBundleDiscount)
+	}
+	if act.BundleConfig == nil {
+		t.Fatalf("bundleConfig nil")
+	}
+	if act.BundleConfig.Pricing.Type != "fixed_price" {
+		t.Errorf("pricing.type = %s, want fixed_price", act.BundleConfig.Pricing.Type)
+	}
+	if act.BundleConfig.Pricing.Value != 49.99 {
+		t.Errorf("pricing.value = %v, want 49.99", act.BundleConfig.Pricing.Value)
+	}
+	if !act.BundleConfig.RequireAllContainers {
+		t.Errorf("RequireAllContainers expected true")
+	}
+	if len(act.BundleConfig.Containers) != 2 {
+		t.Fatalf("expected 2 containers, got %d", len(act.BundleConfig.Containers))
+	}
+	if act.Config == nil || act.Config["note"] != "Bundle applies to footwear + socks" {
+		t.Errorf("config.note mismatch: %v", act.Config)
+	}
+}
+
+func TestConditionValueInvalidTypes(t *testing.T) {
+	cases := []struct {
+		name string
+		raw  string
+	}{
+		{"object", `{}`},
+		{"booleanTrue", `true`},
+		{"booleanFalse", `false`},
+		{"null", `null`},
+	}
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			var cv ConditionValue
+			if err := json.Unmarshal([]byte(tc.raw), &cv); err != nil {
+				t.Fatalf("unmarshal failed: %v", err)
+			}
+			if s, ok := cv.AsString(); ok {
+				t.Errorf("AsString unexpectedly succeeded (%q) for %s", s, tc.name)
+			}
+			if n, ok := cv.AsFloat64(); ok {
+				t.Errorf("AsFloat64 unexpectedly succeeded (%v) for %s", n, tc.name)
+			}
+			if ss, ok := cv.AsStringSlice(); ok {
+				t.Errorf("AsStringSlice unexpectedly succeeded (%v) for %s", ss, tc.name)
+			}
+			if fs, ok := cv.AsFloat64Slice(); ok {
+				t.Errorf("AsFloat64Slice unexpectedly succeeded (%v) for %s", fs, tc.name)
+			}
+		})
+	}
+}
+
+func TestPromotionRuleRoundTrip(t *testing.T) {
+	orig, err := DecodePromotionRules(sampleJSON)
+	if err != nil {
+		t.Fatalf("initial decode failed: %v", err)
+	}
+	data, err := json.Marshal(orig)
+	if err != nil {
+		t.Fatalf("marshal failed: %v", err)
+	}
+	round, err := DecodePromotionRules(data)
+	if err != nil {
+		t.Fatalf("round-trip decode failed: %v", err)
+	}
+	if len(orig) != len(round) {
+		t.Fatalf("rule count mismatch: orig=%d round=%d", len(orig), len(round))
+	}
+	// spot-check first rule
+	if orig[0].Name != round[0].Name {
+		t.Errorf("first rule name mismatch: %s vs %s", orig[0].Name, round[0].Name)
+	}
+	if len(orig[0].Conditions) != len(round[0].Conditions) {
+		t.Errorf("first rule condition count mismatch: %d vs %d", len(orig[0].Conditions), len(round[0].Conditions))
+	}
+}
+
+func floatPtr(f float64) *float64 { return &f }

pkg/promotions/types.go

@@ -0,0 +1,413 @@
+package promotions
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+// -----------------------------
+// Enum-like string types
+// -----------------------------
+
+type ConditionOperator string
+
+const (
+	OpEquals         ConditionOperator = "="
+	OpNotEquals      ConditionOperator = "!="
+	OpGreaterThan    ConditionOperator = ">"
+	OpLessThan       ConditionOperator = "<"
+	OpGreaterOrEqual ConditionOperator = ">="
+	OpLessOrEqual    ConditionOperator = "<="
+	OpContains       ConditionOperator = "contains"
+	OpNotContains    ConditionOperator = "not_contains"
+	OpIn             ConditionOperator = "in"
+	OpNotIn          ConditionOperator = "not_in"
+)
+
+type ConditionType string
+
+const (
+	CondCartTotal        ConditionType = "cart_total"
+	CondItemQuantity     ConditionType = "item_quantity"
+	CondCustomerSegment  ConditionType = "customer_segment"
+	CondProductCategory  ConditionType = "product_category"
+	CondProductID        ConditionType = "product_id"
+	CondCustomerLifetime ConditionType = "customer_lifetime_value"
+	CondOrderCount       ConditionType = "order_count"
+	CondDateRange        ConditionType = "date_range"
+	CondDayOfWeek        ConditionType = "day_of_week"
+	CondTimeOfDay        ConditionType = "time_of_day"
+	CondGroup            ConditionType = "group" // synthetic value for groups
+)
+
+type ActionType string
+
+const (
+	ActionPercentageDiscount ActionType = "percentage_discount"
+	ActionFixedDiscount      ActionType = "fixed_discount"
+	ActionFreeShipping       ActionType = "free_shipping"
+	ActionBuyXGetY           ActionType = "buy_x_get_y"
+	ActionTieredDiscount     ActionType = "tiered_discount"
+	ActionBundleDiscount     ActionType = "bundle_discount"
+)
+
+type LogicOperator string
+
+const (
+	LogicAND LogicOperator = "&&"
+	LogicOR  LogicOperator = "||"
+)
+
+type PromotionStatus string
+
+const (
+	StatusActive    PromotionStatus = "active"
+	StatusInactive  PromotionStatus = "inactive"
+	StatusScheduled PromotionStatus = "scheduled"
+	StatusExpired   PromotionStatus = "expired"
+)
+
+// -----------------------------
+// Condition Value (union)
+// -----------------------------
+//
+// Represents: string | number | []string | []number
+// We store raw JSON and lazily interpret.
+
+type ConditionValue struct {
+	Raw json.RawMessage
+}
+
+func (cv *ConditionValue) UnmarshalJSON(b []byte) error {
+	if len(b) == 0 {
+		return errors.New("empty ConditionValue")
+	}
+	// Just store raw; interpretation happens via helpers.
+	cv.Raw = append(cv.Raw[0:0], b...)
+	return nil
+}
+
+// Helpers to interpret value:
+func (cv ConditionValue) AsString() (string, bool) {
+	// Treat explicit JSON null as invalid
+	if string(cv.Raw) == "null" {
+		return "", false
+	}
+	var s string
+	if err := json.Unmarshal(cv.Raw, &s); err == nil {
+		return s, true
+	}
+	return "", false
+}
+
+func (cv ConditionValue) AsFloat64() (float64, bool) {
+	if string(cv.Raw) == "null" {
+		return 0, false
+	}
+	var f float64
+	if err := json.Unmarshal(cv.Raw, &f); err == nil {
+		return f, true
+	}
+	// Attempt integer decode into float64
+	var i int64
+	if err := json.Unmarshal(cv.Raw, &i); err == nil {
+		return float64(i), true
+	}
+	return 0, false
+}
+
+func (cv ConditionValue) AsStringSlice() ([]string, bool) {
+	if string(cv.Raw) == "null" {
+		return nil, false
+	}
+	var arr []string
+	if err := json.Unmarshal(cv.Raw, &arr); err == nil {
+		return arr, true
+	}
+	return nil, false
+}
+
+func (cv ConditionValue) AsFloat64Slice() ([]float64, bool) {
+	if string(cv.Raw) == "null" {
+		return nil, false
+	}
+	var arrNum []float64
+	if err := json.Unmarshal(cv.Raw, &arrNum); err == nil {
+		return arrNum, true
+	}
+	// Try []int -> []float64
+	var arrInt []int64
+	if err := json.Unmarshal(cv.Raw, &arrInt); err == nil {
+		out := make([]float64, len(arrInt))
+		for i, v := range arrInt {
+			out[i] = float64(v)
+		}
+		return out, true
+	}
+	return nil, false
+}
+
+func (cv ConditionValue) String() string {
+	if s, ok := cv.AsString(); ok {
+		return s
+	}
+	if f, ok := cv.AsFloat64(); ok {
+		return strconv.FormatFloat(f, 'f', -1, 64)
+	}
+	if ss, ok := cv.AsStringSlice(); ok {
+		return fmt.Sprintf("%v", ss)
+	}
+	if fs, ok := cv.AsFloat64Slice(); ok {
+		return fmt.Sprintf("%v", fs)
+	}
+	return string(cv.Raw)
+}
+
+// -----------------------------
+// BaseCondition
+// -----------------------------
+
+type BaseCondition struct {
+	ID       string            `json:"id"`
+	Type     ConditionType     `json:"type"`
+	Operator ConditionOperator `json:"operator"`
+	Value    ConditionValue    `json:"value"`
+	Label    *string           `json:"label,omitempty"`
+}
+
+func (b BaseCondition) IsGroup() bool { return false }
+
+// -----------------------------
+// ConditionGroup
+// -----------------------------
+
+type ConditionGroup struct {
+	ID         string        `json:"id"`
+	Type       string        `json:"type"` // always "group"
+	Operator   LogicOperator `json:"operator"`
+	Conditions Conditions    `json:"conditions"`
+}
+
+// Custom unmarshaller ensures nested polymorphic conditions are decoded
+// using the Conditions type (which applies the raw element discriminator).
+func (g *ConditionGroup) UnmarshalJSON(b []byte) error {
+	type alias struct {
+		ID         string          `json:"id"`
+		Type       string          `json:"type"`
+		Operator   LogicOperator   `json:"operator"`
+		Conditions json.RawMessage `json:"conditions"`
+	}
+	var a alias
+	if err := json.Unmarshal(b, &a); err != nil {
+		return err
+	}
+	// Basic validation
+	if a.Type != "group" {
+		return fmt.Errorf("ConditionGroup expected type 'group', got %q", a.Type)
+	}
+
+	var conds Conditions
+	if len(a.Conditions) > 0 {
+		if err := json.Unmarshal(a.Conditions, &conds); err != nil {
+			return err
+		}
+	}
+
+	g.ID = a.ID
+	g.Type = a.Type
+	switch strings.ToLower(string(a.Operator)) {
+	case "and":
+		g.Operator = LogicAND
+	case "or":
+		g.Operator = LogicOR
+	default:
+		g.Operator = a.Operator
+	}
+	g.Conditions = conds
+	return nil
+}
+
+func (g ConditionGroup) IsGroup() bool { return true }
+
+// -----------------------------
+// Condition interface + slice
+// -----------------------------
+
+type Condition interface {
+	IsGroup() bool
+}
+
+// Internal wrapper to help decode each element.
+type rawCond struct {
+	Type string `json:"type"`
+}
+
+// Custom unmarshaler for a Condition slice
+type Conditions []Condition
+
+func (cs *Conditions) UnmarshalJSON(b []byte) error {
+	var rawList []json.RawMessage
+	if err := json.Unmarshal(b, &rawList); err != nil {
+		return err
+	}
+	out := make([]Condition, 0, len(rawList))
+	for _, elem := range rawList {
+		var hdr rawCond
+		if err := json.Unmarshal(elem, &hdr); err != nil {
+			return err
+		}
+		if hdr.Type == "group" {
+			var grp ConditionGroup
+			if err := json.Unmarshal(elem, &grp); err != nil {
+				return err
+			}
+			// Recursively decode grp.Conditions (already handled because field type is []Condition)
+			out = append(out, grp)
+		} else {
+			var bc BaseCondition
+			if err := json.Unmarshal(elem, &bc); err != nil {
+				return err
+			}
+			out = append(out, bc)
+		}
+	}
+	*cs = out
+	return nil
+}
+
+// -----------------------------
+// Bundle Structures
+// -----------------------------
+
+type BundleQualifyingRules struct {
+	Type  string      `json:"type"`  // "category" | "product_ids" | "tag" | "all"
+	Value interface{} `json:"value"` // string or []string
+}
+
+type BundleContainer struct {
+	ID              string                `json:"id"`
+	Name            string                `json:"name"`
+	Quantity        int                   `json:"quantity"`
+	SelectionType   string                `json:"selectionType"` // "any" | "specific"
+	QualifyingRules BundleQualifyingRules `json:"qualifyingRules"`
+	AllowedProducts []string              `json:"allowedProducts,omitempty"`
+}
+
+type BundlePricing struct {
+	Type  string  `json:"type"` // "fixed_price" | "percentage_discount" | "fixed_discount"
+	Value float64 `json:"value"`
+}
+
+type BundleConfig struct {
+	Containers           []BundleContainer `json:"containers"`
+	Pricing              BundlePricing     `json:"pricing"`
+	RequireAllContainers bool              `json:"requireAllContainers"`
+}
+
+// -----------------------------
+// Action
+// -----------------------------
+
+type Action struct {
+	ID           string                 `json:"id"`
+	Type         ActionType             `json:"type"`
+	Value        interface{}            `json:"value"` // number or string
+	Config       map[string]interface{} `json:"config,omitempty"`
+	BundleConfig *BundleConfig          `json:"bundleConfig,omitempty"`
+	Label        *string                `json:"label,omitempty"`
+}
+
+// -----------------------------
+// Promotion Rule
+// -----------------------------
+
+type PromotionRule struct {
+	ID          string          `json:"id"`
+	Name        string          `json:"name"`
+	Description string          `json:"description"`
+	Status      PromotionStatus `json:"status"`
+	Priority    int             `json:"priority"`
+	StartDate   string          `json:"startDate"`
+	EndDate     *string         `json:"endDate"` // null -> nil
+	Conditions  Conditions      `json:"conditions"`
+	Actions     []Action        `json:"actions"`
+	UsageLimit  *int            `json:"usageLimit,omitempty"`
+	UsageCount  int             `json:"usageCount"`
+	CreatedAt   string          `json:"createdAt"`
+	UpdatedAt   string          `json:"updatedAt"`
+	CreatedBy   string          `json:"createdBy"`
+	Tags        []string        `json:"tags"`
+}
+
+// -----------------------------
+// Promotion Stats
+// -----------------------------
+
+type PromotionStats struct {
+	TotalPromotions  int     `json:"totalPromotions"`
+	ActivePromotions int     `json:"activePromotions"`
+	TotalRevenue     float64 `json:"totalRevenue"`
+	TotalOrders      int     `json:"totalOrders"`
+	AverageDiscount  float64 `json:"averageDiscount"`
+}
+
+// -----------------------------
+// Utility: Decode array of rules
+// -----------------------------
+
+func DecodePromotionRules(data []byte) ([]PromotionRule, error) {
+	var rules []PromotionRule
+	if err := json.Unmarshal(data, &rules); err != nil {
+		return nil, err
+	}
+	return rules, nil
+}
+
+// Example helper to inspect conditions programmatically.
+func WalkConditions(conds []Condition, fn func(c Condition) bool) {
+	for _, c := range conds {
+		if !fn(c) {
+			return
+		}
+		if grp, ok := c.(ConditionGroup); ok {
+			WalkConditions(grp.Conditions, fn)
+		}
+	}
+}
+
+type PromotionState struct {
+	Promotions []PromotionRule `json:"promotions"`
+}
+
+type StateFile struct {
+	State   PromotionState `json:"state"`
+	Version int            `json:"version"`
+}
+
+func (sf *StateFile) GetPromotion(id string) (*PromotionRule, bool) {
+	for _, v := range sf.State.Promotions {
+		if v.ID == id {
+			return &v, true
+		}
+	}
+	return nil, false
+}
+
+func LoadStateFile(fileName string) (*StateFile, error) {
+	f, err := os.Open(fileName)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	dec := json.NewDecoder(f)
+	sf := &StateFile{}
+	err = dec.Decode(sf)
+	if err != nil {
+		return nil, err
+	}
+	return sf, nil
+}

pkg/proxy/remotehost.go

@@ -10,6 +10,9 @@ import (
 	"time"
 
 	messages "git.tornberg.me/go-cart-actor/pkg/messages"
+	"go.opentelemetry.io/contrib/bridges/otelslog"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials/insecure"
 )
@@ -26,6 +29,14 @@ type RemoteHost struct {
 	missedPings   int
 }
 
+const name = "proxy"
+
+var (
+	tracer = otel.Tracer(name)
+	meter  = otel.Meter(name)
+	logger = otelslog.NewLogger(name)
+)
+
 func NewRemoteHost(host string) (*RemoteHost, error) {
 
 	target := fmt.Sprintf("%s:1337", host)
@@ -49,7 +60,7 @@ func NewRemoteHost(host string) (*RemoteHost, error) {
 
 	return &RemoteHost{
 		host:          host,
-		httpBase:      fmt.Sprintf("http://%s:8080/cart", host),
+		httpBase:      fmt.Sprintf("http://%s:8080", host),
 		conn:          conn,
 		transport:     transport,
 		client:        client,
@@ -146,8 +157,20 @@ func (h *RemoteHost) AnnounceExpiry(uids []uint64) {
 func (h *RemoteHost) Proxy(id uint64, w http.ResponseWriter, r *http.Request) (bool, error) {
 	target := fmt.Sprintf("%s%s", h.httpBase, r.URL.RequestURI())
 
-	req, err := http.NewRequestWithContext(r.Context(), r.Method, target, r.Body)
+	ctx, span := tracer.Start(r.Context(), "remote_proxy")
+	defer span.End()
+	span.SetAttributes(
+		attribute.String("component", "proxy"),
+		attribute.String("cartid", fmt.Sprintf("%d", id)),
+		attribute.String("host", h.host),
+		attribute.String("method", r.Method),
+		attribute.String("target", target),
+	)
+	logger.InfoContext(ctx, "proxying request", "cartid", id, "host", h.host, "method", r.Method)
+
+	req, err := http.NewRequestWithContext(ctx, r.Method, target, r.Body)
 	if err != nil {
+		span.RecordError(err)
 		http.Error(w, "proxy build error", http.StatusBadGateway)
 		return false, err
 	}
@@ -161,25 +184,27 @@ func (h *RemoteHost) Proxy(id uint64, w http.ResponseWriter, r *http.Request) (b
 	}
 	res, err := h.client.Do(req)
 	if err != nil {
+		span.RecordError(err)
 		http.Error(w, "proxy request error", http.StatusBadGateway)
 		return false, err
 	}
 	defer res.Body.Close()
+	span.SetAttributes(attribute.Int("status_code", res.StatusCode))
 	for k, v := range res.Header {
 		for _, vv := range v {
 			w.Header().Add(k, vv)
 		}
 	}
 	w.Header().Set("X-Cart-Owner-Routed", "true")
-	if res.StatusCode >= 200 && res.StatusCode <= 299 {
-		w.WriteHeader(res.StatusCode)
-		_, copyErr := io.Copy(w, res.Body)
-		if copyErr != nil {
-			return true, copyErr
-		}
-		return true, nil
+
+	w.WriteHeader(res.StatusCode)
+	_, copyErr := io.Copy(w, res.Body)
+	if copyErr != nil {
+		span.RecordError(copyErr)
+		return true, copyErr
 	}
-	return false, fmt.Errorf("proxy response status %d", res.StatusCode)
+	return true, nil
+
 }
 
 func (r *RemoteHost) IsHealthy() bool {

pkg/voucher/parser.go

@@ -3,6 +3,7 @@ package voucher
 import (
 	"errors"
 	"fmt"
+	"slices"
 	"strconv"
 	"strings"
 	"unicode"
@@ -137,12 +138,7 @@ func (rs *RuleSet) Applies(ctx EvalContext) bool {
 
 // anyItem returns true if predicate matches any item.
 func anyItem(items []Item, pred func(Item) bool) bool {
-	for _, it := range items {
-		if pred(it) {
-			return true
-		}
-	}
-	return false
+	return slices.ContainsFunc(items, pred)
 }
 
 // ParseRules parses a rule expression into a RuleSet.

pkg/voucher/parser_test.go

@@ -28,6 +28,32 @@ func TestParseRules_SimpleSku(t *testing.T) {
 	}
 }
 
+func TestRuleCartTotal(t *testing.T) {
+	rs, err := ParseRules("min_total>=500000")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if len(rs.Conditions) != 1 {
+		t.Fatalf("expected 1 condition got %d", len(rs.Conditions))
+	}
+	c := rs.Conditions[0]
+	if c.Kind != RuleMinTotal {
+		t.Fatalf("expected kind cart total got %s", c.Kind)
+	}
+	ctx := EvalContext{
+		Items: []Item{
+			Item{
+				Sku: "123",
+			},
+		},
+		CartTotalInc: 400000,
+	}
+	applied := rs.Applies(ctx)
+	if applied {
+		t.Fatalf("expected")
+	}
+}
+
 func TestParseRules_CategoryAndSkuMixedSeparators(t *testing.T) {
 	rs, err := ParseRules("  category=Shoes|Bags ; sku= A | B , min_total>=1000\nmin_item_price>=500")
 	if err != nil {

pkg/voucher/service.go

@@ -1,7 +1,10 @@
 package voucher
 
 import (
+	"encoding/json"
 	"errors"
+	"fmt"
+	"os"
 
 	"git.tornberg.me/go-cart-actor/pkg/messages"
 )
@@ -12,16 +15,14 @@ type Rule struct {
 }
 
 type Voucher struct {
-	Code     string `json:"code"`
-	Value    int64  `json:"discount"`
-	TaxValue int64  `json:"taxValue"`
-	TaxRate  int    `json:"taxRate"`
-	rules    []Rule `json:"rules"`
+	Code        string `json:"code"`
+	Value       int64  `json:"value"`
+	Rules       string `json:"rules"`
+	Description string `json:"description,omitempty"`
 }
 
 type Service struct {
 	// Add fields here
-
 }
 
 var ErrInvalidCode = errors.New("invalid vouchercode")
@@ -30,10 +31,54 @@ func (s *Service) GetVoucher(code string) (*messages.AddVoucher, error) {
 	if code == "" {
 		return nil, ErrInvalidCode
 	}
-	value := int64(250_00)
+	sf, err := LoadStateFile("data/vouchers.json")
+	if err != nil {
+		return nil, err
+	}
+	v, ok := sf.GetVoucher(code)
+	if !ok {
+		return nil, fmt.Errorf("no voucher found for code: %s", code)
+	}
+
 	return &messages.AddVoucher{
-		Code:         code,
-		Value:        value,
-		VoucherRules: make([]*messages.VoucherRule, 0),
+		Code:        code,
+		Value:       v.Value,
+		Description: v.Description,
+		VoucherRules: []string{
+			v.Rules,
+		},
 	}, nil
 }
+
+type State struct {
+	Vouchers []Voucher `json:"vouchers"`
+}
+
+type StateFile struct {
+	State   State `json:"state"`
+	Version int   `json:"version"`
+}
+
+func (sf *StateFile) GetVoucher(code string) (*Voucher, bool) {
+	for _, v := range sf.State.Vouchers {
+		if v.Code == code {
+			return &v, true
+		}
+	}
+	return nil, false
+}
+
+func LoadStateFile(fileName string) (*StateFile, error) {
+	f, err := os.Open(fileName)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	dec := json.NewDecoder(f)
+	sf := &StateFile{}
+	err = dec.Decode(sf)
+	if err != nil {
+		return nil, err
+	}
+	return sf, nil
+}

proto/messages.proto

@@ -2,115 +2,123 @@ syntax = "proto3";
 package messages;
 option go_package = "git.tornberg.me/go-cart-actor/proto;messages";
 
-message ClearCartRequest {
+import "google/protobuf/any.proto";
 
-}
+message ClearCartRequest {}
 
 message AddItem {
-	uint32 item_id = 1;
-	int32 quantity = 2;
-	int64 price = 3;
-	int64 orgPrice = 9;
-	string sku = 4;
-	string name = 5;
-	string image = 6;
-	int32 stock = 7;
-	int32 tax = 8;
-	string brand = 13;
-	string category = 14;
-	string category2 = 15;
-	string category3 = 16;
-	string category4 = 17;
-	string category5 = 18;
-	string disclaimer = 10;
-	string articleType = 11;
-	string sellerId = 19;
-	string sellerName = 20;
-	string country = 21;
-	optional string outlet = 12;
-	optional string storeId = 22;
-	optional uint32 parentId = 23;
+  uint32 item_id = 1;
+  int32 quantity = 2;
+  int64 price = 3;
+  int64 orgPrice = 9;
+  string sku = 4;
+  string name = 5;
+  string image = 6;
+  int32 stock = 7;
+  int32 tax = 8;
+  string brand = 13;
+  string category = 14;
+  string category2 = 15;
+  string category3 = 16;
+  string category4 = 17;
+  string category5 = 18;
+  string disclaimer = 10;
+  string articleType = 11;
+  string sellerId = 19;
+  string sellerName = 20;
+  string country = 21;
+  string saleStatus = 24;
+  optional string outlet = 12;
+  optional string storeId = 22;
+  optional uint32 parentId = 23;
 }
 
-message RemoveItem {
-	uint32 Id = 1;
-}
+message RemoveItem { uint32 Id = 1; }
 
 message ChangeQuantity {
-    uint32 Id = 1;
-	int32 quantity = 2;
+  uint32 Id = 1;
+  int32 quantity = 2;
 }
 
 message SetDelivery {
-	string provider = 1;
-	repeated uint32 items = 2;
-	optional PickupPoint pickupPoint = 3;
-	string country = 4;
-	string zip = 5;
-	optional string address = 6;
-	optional string city = 7;
+  string provider = 1;
+  repeated uint32 items = 2;
+  optional PickupPoint pickupPoint = 3;
+  string country = 4;
+  string zip = 5;
+  optional string address = 6;
+  optional string city = 7;
 }
 
 message SetPickupPoint {
-	uint32 deliveryId = 1;
-	string id = 2;
-	optional string name = 3;
-	optional string address = 4;
-	optional string city = 5;
-	optional string zip = 6;
-	optional string country = 7;
+  uint32 deliveryId = 1;
+  string id = 2;
+  optional string name = 3;
+  optional string address = 4;
+  optional string city = 5;
+  optional string zip = 6;
+  optional string country = 7;
 }
 
 message PickupPoint {
-	string id = 1;
-	optional string name = 2;
-	optional string address = 3;
-	optional string city = 4;
-	optional string zip = 5;
-	optional string country = 6;
+  string id = 1;
+  optional string name = 2;
+  optional string address = 3;
+  optional string city = 4;
+  optional string zip = 5;
+  optional string country = 6;
 }
 
-message RemoveDelivery {
-	uint32 id = 1;
-}
+message RemoveDelivery { uint32 id = 1; }
 
 message CreateCheckoutOrder {
-	string terms = 1;
-	string checkout = 2;
-	string confirmation = 3;
-	string push = 4;
-	string validation = 5;
-	string country = 6;
+  string terms = 1;
+  string checkout = 2;
+  string confirmation = 3;
+  string push = 4;
+  string validation = 5;
+  string country = 6;
 }
 
 message OrderCreated {
-	string orderId = 1;
-	string status = 2;
+  string orderId = 1;
+  string status = 2;
 }
 
 message Noop {
-	// Intentionally empty - used for ownership acquisition or health pings
+  // Intentionally empty - used for ownership acquisition or health pings
 }
 
 message InitializeCheckout {
-	string orderId = 1;
-	string status = 2;
-	bool paymentInProgress = 3;
+  string orderId = 1;
+  string status = 2;
+  bool paymentInProgress = 3;
 }
 
-message VoucherRule {
-	string type = 2;
-	string description = 3;
-	string condition = 4;
-	string action = 5;
+message InventoryReserved  {
+    string id = 1;
+    string status = 2;
+    optional string message = 3;
 }
 
 message AddVoucher {
-    string code = 1;
-    int64 value = 2;
-    repeated VoucherRule voucherRules = 3;
+  string code = 1;
+  int64 value = 2;
+  repeated string voucherRules = 3;
+  string description = 4;
 }
 
-message RemoveVoucher {
-    uint32 id = 1;
+message RemoveVoucher { uint32 id = 1; }
+
+message UpsertSubscriptionDetails {
+  optional string id = 1;
+  string offeringCode = 2;
+  string signingType = 3;
+  google.protobuf.Any data = 4;
+}
+
+message PreConditionFailed {
+  string operation = 1;
+  string error = 2;
+  google.protobuf.Any input = 3;
 }