even more refactoring

Makefile

@@ -0,0 +1,119 @@
+# ------------------------------------------------------------------------------
+# Makefile for go-cart-actor
+#
+# Key targets:
+#   make protogen      - Generate protobuf + gRPC code into proto/
+#   make clean_proto   - Remove generated proto *.pb.go files
+#   make verify_proto  - Ensure no stray root-level *.pb.go files exist
+#   make build         - Build the project
+#   make test          - Run tests (verbose)
+#   make tidy          - Run go mod tidy
+#   make regen         - Clean proto, regenerate, tidy, verify, build
+#   make help          - Show this help
+#
+# Conventions:
+#   - All .proto files live in $(PROTO_DIR)
+#   - Generated Go code is emitted under $(PROTO_DIR) via go_package mapping
+#   - go_package is set to: git.tornberg.me/go-cart-actor/proto;messages
+# ------------------------------------------------------------------------------
+
+MODULE_PATH := git.tornberg.me/go-cart-actor
+PROTO_DIR   := proto
+PROTOS      := $(PROTO_DIR)/messages.proto $(PROTO_DIR)/cart_actor.proto $(PROTO_DIR)/control_plane.proto
+
+# Allow override: make PROTOC=/path/to/protoc
+PROTOC ?= protoc
+
+# Tools (auto-detect; can override)
+PROTOC_GEN_GO        ?= $(shell command -v protoc-gen-go 2>/dev/null)
+PROTOC_GEN_GO_GRPC   ?= $(shell command -v protoc-gen-go-grpc 2>/dev/null)
+
+GO        ?= go
+
+# Colors (optional)
+GREEN  := \033[32m
+RED    := \033[31m
+YELLOW := \033[33m
+RESET  := \033[0m
+
+# ------------------------------------------------------------------------------
+
+.PHONY: protogen clean_proto verify_proto tidy build test regen help check_tools
+
+help:
+	@echo "Available targets:"
+	@echo "  protogen      Generate protobuf & gRPC code"
+	@echo "  clean_proto   Remove generated *.pb.go files in $(PROTO_DIR)"
+	@echo "  verify_proto  Ensure no root-level *.pb.go files (old layout)"
+	@echo "  tidy          Run go mod tidy"
+	@echo "  build         Build the module"
+	@echo "  test          Run tests (verbose)"
+	@echo "  regen         Clean proto, regenerate, tidy, verify, and build"
+	@echo "  check_tools   Verify protoc + plugins are installed"
+
+check_tools:
+	@if [ -z "$(PROTOC_GEN_GO)" ] || [ -z "$(PROTOC_GEN_GO_GRPC)" ]; then \
+		echo "$(RED)Missing protoc-gen-go or protoc-gen-go-grpc in PATH.$(RESET)"; \
+		echo "Install with:"; \
+		echo "  go install google.golang.org/protobuf/cmd/protoc-gen-go@latest"; \
+		echo "  go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest"; \
+		exit 1; \
+	fi
+	@if ! command -v "$(PROTOC)" >/dev/null 2>&1; then \
+		echo "$(RED)protoc not found. Install protoc (e.g. via package manager)$(RESET)"; \
+		exit 1; \
+	fi
+	@echo "$(GREEN)All required tools detected.$(RESET)"
+
+protogen: check_tools
+	@echo "$(YELLOW)Generating protobuf code (outputs -> ./proto)...$(RESET)"
+	$(PROTOC) -I $(PROTO_DIR) \
+	  --go_out=./proto --go_opt=paths=source_relative \
+	  --go-grpc_out=./proto --go-grpc_opt=paths=source_relative \
+	  $(PROTOS)
+	@echo "$(GREEN)Protobuf generation complete.$(RESET)"
+
+clean_proto:
+	@echo "$(YELLOW)Removing generated protobuf files...$(RESET)"
+	@rm -f $(PROTO_DIR)/*_grpc.pb.go $(PROTO_DIR)/*.pb.go
+	@rm -f *.pb.go
+	@rm -rf git.tornberg.me
+	@echo "$(GREEN)Clean complete.$(RESET)"
+
+verify_proto:
+	@echo "$(YELLOW)Verifying proto layout...$(RESET)"
+	@if ls *.pb.go >/dev/null 2>&1; then \
+		echo "$(RED)ERROR: Found root-level generated *.pb.go files (should be only under $(PROTO_DIR)/).$(RESET)"; \
+		ls -1 *.pb.go; \
+		exit 1; \
+	fi
+	@echo "$(GREEN)Proto layout OK (no root-level *.pb.go files).$(RESET)"
+
+tidy:
+	@echo "$(YELLOW)Running go mod tidy...$(RESET)"
+	$(GO) mod tidy
+	@echo "$(GREEN)tidy complete.$(RESET)"
+
+build:
+	@echo "$(YELLOW)Building...$(RESET)"
+	$(GO) build ./...
+	@echo "$(GREEN)Build success.$(RESET)"
+
+test:
+	@echo "$(YELLOW)Running tests...$(RESET)"
+	$(GO) test -v ./...
+	@echo "$(GREEN)Tests completed.$(RESET)"
+
+regen: clean_proto protogen tidy verify_proto build
+	@echo "$(GREEN)Full regenerate cycle complete.$(RESET)"
+
+# Utility: show proto sources and generated outputs
+print_proto:
+	@echo "Proto sources:"
+	@ls -1 $(PROTOS)
+	@echo ""
+	@echo "Generated files (if any):"
+	@ls -1 $(PROTO_DIR)/*pb.go 2>/dev/null || echo "(none)"
+
+# Prevent make from treating these as file targets if similarly named files appear.
+.SILENT: help check_tools protogen clean_proto verify_proto tidy build test regen print_proto

README.md

@@ -6,7 +6,7 @@ A distributed cart management system using the actor model pattern.
 
 - Go 1.24.2+
 - Protocol Buffers compiler (`protoc`)
-- protoc-gen-go plugin
+- protoc-gen-go and protoc-gen-go-grpc plugins
 
 ### Installing Protocol Buffers
 
@@ -32,17 +32,20 @@ sudo apt install protobuf-compiler
 
 ```bash
 go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
 ```
 
 ## Working with Protocol Buffers
 
 ### Generating Go code from proto files
 
-After modifying `proto/messages.proto`, regenerate the Go code:
+After modifying any proto (`proto/messages.proto`, `proto/cart_actor.proto`, `proto/control_plane.proto`), regenerate the Go code (all three share the unified `messages` package):
 
 ```bash
 cd proto
-protoc --go_out=. --go_opt=paths=source_relative messages.proto
+protoc --go_out=. --go_opt=paths=source_relative \
+       --go-grpc_out=. --go-grpc_opt=paths=source_relative \
+       messages.proto cart_actor.proto control_plane.proto
 ```
 
 ### Protocol Buffer Messages
@@ -73,8 +76,339 @@ go build .
 go test ./...
 ```
 
+## HTTP API Quick Start (curl Examples)
+
+Assuming the service is reachable at http://localhost:8080 and the cart API is mounted at /cart.
+Most endpoints use an HTTP cookie named `cartid` to track the cart. The first request will set it.
+
+### 1. Get (or create) a cart
+```bash
+curl -i http://localhost:8080/cart/
+```
+Response sets a `cartid` cookie and returns the current (possibly empty) cart JSON.
+
+### 2. Add an item by SKU (implicit quantity = 1)
+```bash
+curl -i --cookie-jar cookies.txt http://localhost:8080/cart/add/TEST-SKU-123
+```
+Stores cookie in `cookies.txt` for subsequent calls.
+
+### 3. Add an item with explicit payload (country, quantity)
+```bash
+curl -i --cookie cookies.txt \
+  -H "Content-Type: application/json" \
+  -d '{"sku":"TEST-SKU-456","quantity":2,"country":"se"}' \
+  http://localhost:8080/cart/
+```
+
+### 4. Change quantity of an existing line
+(First list the cart to find `id` of the line; here we use id=1 as an example)
+```bash
+curl -i --cookie cookies.txt \
+  -X PUT -H "Content-Type: application/json" \
+  -d '{"id":1,"quantity":3}' \
+  http://localhost:8080/cart/
+```
+
+### 5. Remove an item
+```bash
+curl -i --cookie cookies.txt -X DELETE http://localhost:8080/cart/1
+```
+
+### 6. Set entire cart contents (overwrites items)
+```bash
+curl -i --cookie cookies.txt \
+  -X POST -H "Content-Type: application/json" \
+  -d '{"items":[{"sku":"TEST-SKU-AAA","quantity":1,"country":"se"},{"sku":"TEST-SKU-BBB","quantity":2,"country":"se"}]}' \
+  http://localhost:8080/cart/set
+```
+
+### 7. Add a delivery (provider + optional items)
+If `items` is empty or omitted, all items without a delivery get this one.
+```bash
+curl -i --cookie cookies.txt \
+  -X POST -H "Content-Type: application/json" \
+  -d '{"provider":"standard","items":[1,2]}' \
+  http://localhost:8080/cart/delivery
+```
+
+### 8. Remove a delivery by deliveryId
+```bash
+curl -i --cookie cookies.txt -X DELETE http://localhost:8080/cart/delivery/1
+```
+
+### 9. Set a pickup point for a delivery
+```bash
+curl -i --cookie cookies.txt \
+  -X PUT -H "Content-Type: application/json" \
+  -d '{"id":"PUP123","name":"Locker 5","address":"Main St 1","city":"Stockholm","zip":"11122","country":"SE"}' \
+  http://localhost:8080/cart/delivery/1/pickupPoint
+```
+
+### 10. Checkout (returns HTML snippet from Klarna)
+```bash
+curl -i --cookie cookies.txt http://localhost:8080/cart/checkout
+```
+
+### 11. Using a known cart id directly (bypassing cookie)
+If you already have a cart id (e.g. 1720000000000000):
+```bash
+CART_ID=1720000000000000
+curl -i http://localhost:8080/cart/byid/$CART_ID
+curl -i -X POST -H "Content-Type: application/json" \
+  -d '{"sku":"TEST-SKU-XYZ","quantity":1,"country":"se"}' \
+  http://localhost:8080/cart/byid/$CART_ID
+```
+
+### 12. Clear cart cookie (forces a new cart on next request)
+```bash
+curl -i --cookie cookies.txt -X DELETE http://localhost:8080/cart/
+```
+
+Tip: Use `--cookie-jar` and `--cookie` to persist the session across multiple commands:
+```bash
+curl --cookie-jar cookies.txt http://localhost:8080/cart/
+curl --cookie cookies.txt http://localhost:8080/cart/add/TEST-SKU-123
+```
+
 ## Important Notes
 
-- Always regenerate protobuf Go code after modifying `.proto` files
+- Always regenerate protobuf Go code after modifying any `.proto` files (messages/cart_actor/control_plane)
 - The generated `messages.pb.go` file should not be edited manually
 - Make sure your PATH includes the protoc-gen-go binary location (usually `$GOPATH/bin`)
+
+---
+
+## Architecture Overview
+
+The system is a distributed, sharded (by cart id) actor model implementation:
+
+- Each cart is a grain (an in‑memory struct `*CartGrain`) that owns and mutates its own state.
+- A **local grain pool** holds grains owned by the node.
+- A **synced (cluster) pool** (`SyncedPool`) coordinates multiple nodes and exposes local or remote grains through a uniform interface (`GrainPool`).
+- All inter‑node communication is gRPC:
+  - Cart mutation & state RPCs (CartActor service).
+  - Control plane RPCs (ControlPlane service) for membership, ownership negotiation, liveness, and graceful shutdown.
+
+### Key Processes
+
+1. Client HTTP request (or gRPC client) arrives with a cart identifier (cookie or path).
+2. The pool resolves ownership:
+   - If local grain exists → use it.
+   - If a remote host is known owner → a remote grain proxy (`RemoteGrainGRPC`) is used; it performs gRPC calls to the owning node.
+   - If ownership is unknown → node attempts to claim ownership (quorum negotiation) and spawns a local grain.
+3. Mutation is executed via the **mutation registry** (registry wraps domain logic + optional totals recomputation).
+4. Updated state returned to caller; ownership preserved unless relinquished later (not yet implemented to shed load).
+
+---
+
+## Grain & Mutation Model
+
+- `CartGrain` holds items, deliveries, pricing aggregates, and checkout/order metadata.
+- All mutations are registered via `RegisterMutation[T]` with signature:
+  ```
+  func(*CartGrain, *T) error
+  ```
+- `WithTotals()` flag triggers automatic recalculation of totals after successful handlers.
+- The old giant `switch` in `CartGrain.Apply` has been replaced by registry dispatch; unregistered mutations fail fast.
+- Adding a mutation:
+  1. Define proto message.
+  2. Generate code.
+  3. Register handler (optionally WithTotals).
+  4. Add gRPC RPC + request wrapper if the mutation must be remotely invokable.
+  5. (Optional) Add HTTP endpoint mapping to the mutation.
+
+---
+
+## Local Grain Pool
+
+- Manages an in‑memory map `map[CartId]*CartGrain`.
+- Lazy spawn: first mutation or explicit access triggers `spawn(id)`.
+- TTL / purge loop periodically removes expired grains unless they changed recently (basic memory pressure management).
+- Capacity limit (`PoolSize`); oldest expired grain evicted first when full.
+
+---
+
+## Synced (Cluster) Pool
+
+`SyncedPool` wraps a local pool and tracks:
+
+- `remoteHosts`: known peer nodes (gRPC connections).
+- `remoteIndex`: mapping of cart id → remote grain proxy (`RemoteGrainGRPC`) for carts owned elsewhere.
+
+Responsibilities:
+
+1. Discovery integration (via a `Discovery` interface) adds/removes hosts.
+2. Periodic ping health checks (ControlPlane.Ping).
+3. Ownership negotiation:
+   - On first contention / unknown owner, node calls `ConfirmOwner` on peers to achieve quorum before making a local grain authoritative.
+4. Remote spawning:
+   - When a remote host reports its cart ids (`GetCartIds`), the pool creates remote proxies for fast routing.
+
+---
+
+## Remote Grain Proxies
+
+A `RemoteGrainGRPC` implements the `Grain` interface but delegates:
+
+- `Apply` → Specific CartActor per‑mutation RPC (e.g., `AddItem`, `RemoveItem`) constructed from the mutation type. (Legacy envelope removed.)
+- `GetCurrentState` → `CartActor.GetState`.
+
+Return path:
+
+1. gRPC reply (CartMutationReply / StateReply) → proto `CartState`.
+2. `ToCartState` / mapping reconstructs a local `CartGrain` snapshot for callers expecting grain semantics.
+
+---
+
+## Control Plane (Inter‑Node Coordination)
+
+Defined in `proto/control_plane.proto`:
+
+| RPC | Purpose |
+|-----|---------|
+| `Ping` | Liveness; increments missed ping counter if failing. |
+| `Negotiate` | Merges membership views; used after discovery events. |
+| `GetCartIds` | Enumerate locally owned carts for remote index seeding. |
+| `ConfirmOwner` | Quorum acknowledgment for ownership claim. |
+| `Closing` | Graceful shutdown notice; peers remove host & associated remote grains. |
+
+### Ownership / Quorum Rules
+
+- If total participating hosts < 3 → all must accept.
+- Otherwise majority acceptance (`ok >= total/2`).
+- On failure → local tentative grain is removed (rollback to avoid split‑brain).
+
+---
+
+## Request / Mutation Flow Examples
+
+### Local Mutation
+1. HTTP handler parses request → determines cart id.
+2. `SyncedPool.Apply`:
+   - Finds local grain (or spawns new after quorum).
+   - Executes registry mutation.
+3. Totals updated if flagged.
+4. HTTP response returns updated JSON (via `ToCartState`).
+
+### Remote Mutation
+1. `SyncedPool.Apply` sees cart mapped to a remote host.
+2. Routes to `RemoteGrainGRPC.Apply`.
+3. Remote node executes mutation locally and returns updated state over gRPC.
+4. Proxy materializes snapshot locally (not authoritative, read‑only view).
+
+### Checkout (Side‑Effecting, Non-Pure)
+- HTTP `/checkout` uses current grain snapshot to build payload (pure function).
+- Calls Klarna externally (not a mutation).
+- Applies `InitializeCheckout` mutation to persist reference + status.
+- Returns Klarna order JSON to client.
+
+---
+
+## Scaling & Deployment
+
+- **Horizontal scaling**: Add more nodes; discovery layer (Kubernetes / service registry) feeds hosts to `SyncedPool`.
+- **Sharding**: Implicit by cart id hash. Ownership is first-claim with quorum acceptance.
+- **Hot spots**: A single popular cart remains on one node; for heavy multi-client concurrency, future work could add read replicas or partitioning (not implemented).
+- **Capacity tuning**: Increase `PoolSize` & memory limits; adjust TTL for stale cart eviction.
+
+### Adding Nodes
+1. Node starts gRPC server (CartActor + ControlPlane).
+2. After brief delay, begins discovery watch; on event:
+   - New host → dial + negotiate → seed remote cart ids.
+3. Pings maintain health; failed hosts removed (proxies invalidated).
+
+---
+
+## Failure Handling
+
+| Scenario | Behavior |
+|----------|----------|
+| Remote host unreachable | Pings increment `MissedPings`; after threshold host removed. |
+| Ownership negotiation fails | Tentative local grain discarded. |
+| gRPC call error on remote mutation | Error bubbled to caller; no local fallback. |
+| Missing mutation registration | Fast failure with explicit error message. |
+| Partial checkout (Klarna fails) | No local state mutation for checkout; client sees error; cart remains unchanged. |
+
+---
+
+## Mutation Registry Summary
+
+- Central, type-safe registry prevents silent omission.
+- Each handler:
+  - Validates input.
+  - Mutates `*CartGrain`.
+  - Returns error for rejection.
+- Automatic totals recomputation reduces boilerplate and consistency risk.
+- Coverage test (add separately) can enforce all proto mutations are registered.
+
+---
+
+## gRPC Interfaces
+
+- **CartActor**: Per-mutation unary RPCs + `GetState`. (Checkout logic intentionally excluded; handled at HTTP layer.)
+- **ControlPlane**: Cluster coordination (Ping, Negotiate, ConfirmOwner, etc.).
+
+**Ports** (default / implied):
+- CartActor & ControlPlane share the same gRPC server/listener (single port, e.g. `:1337`).
+- Legacy frame/TCP code has been removed.
+
+---
+
+## Security & Future Enhancements
+
+| Area | Potential Improvement |
+|------|------------------------|
+| Transport Security | Add TLS / mTLS to gRPC servers & clients. |
+| Auth / RBAC | Intercept CartActor RPCs with auth metadata. |
+| Backpressure | Rate-limit remote mutation calls per host. |
+| Observability | Add per-mutation Prometheus metrics & tracing spans. |
+| Ownership | Add lease timeouts / fencing tokens for stricter guarantees. |
+| Batch Ops | Introduce batch mutation RPC or streaming updates (WatchState). |
+| Persistence | Reintroduce event log or snapshot persistence layer if durability required. |
+
+---
+
+## Adding a New Node (Operational Checklist)
+
+1. Deploy binary/container with same proto + registry.
+2. Expose gRPC port.
+3. Ensure discovery lists the new host.
+4. Node dials peers, negotiates membership.
+5. Remote cart proxies seeded.
+6. Traffic routed automatically based on ownership.
+
+---
+
+## Adding a New Mutation (Checklist Recap)
+
+1. Define proto message (+ request wrapper & RPC if remote invocation needed).
+2. Regenerate protobuf code.
+3. Implement & register handler (`RegisterMutation`).
+4. Add client (HTTP/gRPC) endpoint.
+5. Write unit + integration tests.
+6. (Optional) Add to coverage test list and docs.
+
+---
+
+## High-Level Data Flow Diagram (Text)
+
+```
+Client -> HTTP Handler -> SyncedPool -> (local?) -> Registry -> Grain State
+                       \-> (remote?) -> RemoteGrainGRPC -> gRPC -> Remote CartActor -> Registry -> Grain
+ControlPlane: Discovery Events <-> Negotiation/Ping/ConfirmOwner <-> SyncedPool state
+```
+
+---
+
+## Troubleshooting
+
+| Symptom | Likely Cause | Action |
+|---------|--------------|--------|
+| New cart every request | Secure cookie over plain HTTP or not sending cookie jar | Disable Secure locally or use HTTPS & proper curl `-b` |
+| Unsupported mutation error | Missing registry handler | Add `RegisterMutation` for that proto |
+| Ownership flapping | Quorum failing due to intermittent peers | Investigate `ConfirmOwner` errors / network |
+| Remote mutation latency | Network / serialization overhead | Consider batching or colocating hot carts |
+| Checkout returns 500 | Klarna call failed | Inspect logs; no grain state mutated |
+
+---

TODO.md

@@ -0,0 +1,245 @@
+# TODO / Roadmap
+
+A living roadmap for improving the cart actor system. Focus areas:
+1. Reliability & correctness
+2. Simplicity of mutation & ownership flows
+3. Developer experience (DX)
+4. Operability (observability, tracing, metrics)
+5. Performance & scalability
+6. Security & multi-tenant readiness
+
+---
+
+## 1. Immediate Next Steps (High-Leverage)
+
+| Priority | Task | Goal | Effort | Owner | Notes |
+|----------|------|------|--------|-------|-------|
+| P0 | Add mutation registry coverage test | Ensure no unregistered mutations silently fail | S |  | Failing fast in CI |
+| P0 | Add decodeJSON helper + 400 mapping for EOF | Reduce noisy 500 logs | S |  | Improves client API clarity |
+| P0 | Regenerate protos & prune unused messages (CreateCheckoutOrder, Checkout RPC remnants) | Eliminate dead types | S |  | Avoid confusion |
+| P0 | Add integration test: multi-node ownership negotiation | Validate quorum logic | M |  | Spin up 2–3 nodes ephemeral |
+| P1 | Export Prometheus metrics for per-mutation counts & latency | Operability | M |  | Wrap registry handlers |
+| P1 | Add graceful shutdown ordering (Closing → wait for acks → stop gRPC) | Reduce in-flight mutation failures | S |  | Add context cancellation |
+| P1 | Add coverage for InitializeCheckout / OrderCreated flows | Checkout reliability | S |  | Simulate Klarna stub |
+| P2 | Add optional batching client (apply multiple mutations locally then persist) | Performance | M |  | Only if needed |
+
+---
+
+## 2. Simplification Opportunities
+
+### A. RemoteGrain Proxy Mapping
+Current: manual switch building each RPC call.
+Simplify by:
+- Generating a thin client adapter from proto RPC descriptors (codegen).
+- Or using a registry similar to mutation registry but for “outbound call constructors”.
+Benefit: adding a new mutation = add proto + register server handler + register outbound invoker (no switch edits).
+
+### B. Ownership Negotiation
+Current: ad hoc quorum rule in `SyncedPool`.
+Simplify:
+- Introduce explicit `OwnershipLease{holder, expiresAt, version}`.
+- Use monotonic version increment—reject stale ConfirmOwner replies.
+- Optional: add randomized backoff to reduce thundering herd on contested cart ids.
+
+### C. CartId Handling
+Current: ephemeral 16-byte array with trimmed string semantics.
+Simplify:
+- Use ULID / UUIDv7 (time-ordered, collision-resistant) for easier external correlation.
+- Provide helper `NewCartIdString()` and keep internal fixed-size if still desired.
+
+### D. Mutation Signatures
+Current: registry assumes `func(*CartGrain, *T) error`.
+Extension option: allow pure transforms returning a delta struct (for audit/logging):
+```
+type MutationResult struct {
+  Changed bool
+  Events  []interface{}
+}
+```
+Only implement if auditing/event-sourcing reintroduced.
+
+---
+
+## 3. Developer Experience Improvements
+
+| Task | Rationale | Approach |
+|------|-----------|----------|
+| Makefile targets: `make run-single`, `make run-multi N=3` | Faster local cluster spin-up | Docker compose or background “mini cluster” scripts |
+| Template for new mutation (generator) | Reduce boilerplate | `go:generate` scanning proto for new RPCs |
+| Lint config (golangci-lint) | Catch subtle issues early | Add `.golangci.yml` |
+| Pre-commit hook for proto regeneration check | Avoid stale generated code | Script compares git diff after `make protogen` |
+| Example client (Go + curl snippets auto-generated) | Onboarding | Codegen a markdown from proto comments |
+
+---
+
+## 4. Observability / Metrics / Tracing
+
+| Area | Metric / Trace | Notes |
+|------|----------------|-------|
+| Mutation registry | `cart_mutations_total{type,success}`; duration histogram | Wrap handler |
+| Ownership negotiation | `cart_ownership_attempts_total{result}` | result=accepted,rejected,timeout |
+| Remote latency | `cart_remote_mutation_seconds{method}` | Use client interceptors |
+| Pings | `cart_remote_missed_pings_total{host}` | Already count, expose |
+| Checkout flow | `checkout_attempts_total`, `checkout_failures_total` | Differentiate Klarna vs internal errors |
+| Tracing | Span: HTTP handler → SyncedPool.Apply → (Remote?) gRPC → mutation handler | Add OpenTelemetry instrumentation |
+
+---
+
+## 5. Performance & Scalability
+
+| Concern | Idea | Trade-Off |
+|---------|------|-----------|
+| High mutation rate on single cart | Introduce optional mutation queue (serialize explicitly) | Slight latency increase per op |
+| Remote call overhead | Add client-side gRPC pooling & per-host circuit breaker | Complexity vs resilience |
+| TTL purge efficiency | Use min-heap or timing wheel instead of slice scan | More code, better big-N performance |
+| Batch network latency | Add `BatchMutate` RPC (list of mutations applied atomically) | Lost single-op simplicity |
+
+---
+
+## 6. Reliability Features
+
+| Feature | Description | Priority |
+|---------|-------------|----------|
+| Lease fencing token | Include `ownership_version` in all remote mutate requests | M |
+| Retry policy | Limited retry for transient network errors (idempotent mutations only) | L |
+| Dead host reconciliation | On host removal, proactively attempt re-acquire of its carts | M |
+| Drain mode | Node marks itself “draining” → refuses new ownership claims | M |
+
+---
+
+## 7. Security & Hardening
+
+| Area | Next Step | Detail |
+|------|-----------|--------|
+| Transport | mTLS on gRPC | Use SPIFFE IDs or simple CA |
+| AuthN/AuthZ | Interceptor enforcing service token | Inject metadata header |
+| Input validation | Strengthen JSON decode responses | Disallow unknown fields globally |
+| Rate limiting | Per-IP / per-cart throttling | Guard hotspot abuse |
+| Multi-tenancy | Tenant id dimension in cart id or metadata | Partition metrics & ownership |
+
+---
+
+## 8. Testing Strategy Enhancements
+
+| Gap | Improvement |
+|-----|------------|
+| No multi-node integration test in CI | Spin ephemeral in-process servers on randomized ports |
+| Mutation regression | Table-driven tests auto-discover handlers via registry |
+| Ownership race | Stress test: concurrent Apply on same new cart id from N goroutines |
+| Checkout external dependency | Klarna mock server (HTTptest) + deterministic responses |
+| Fuzzing | Fuzz `BuildCheckoutOrderPayload` & mutation handlers for panics |
+
+---
+
+## 9. Cleanup / Tech Debt
+
+| Item | Action |
+|------|--------|
+| Remove deprecated proto remnants (CreateCheckoutOrder, Checkout RPC) | Delete & regenerate |
+| Consolidate duplicate tax computations | Single helper with tax config |
+| Delivery price hard-coded (4900) | Config or pricing strategy interface |
+| Mixed naming (camel vs snake JSON historically) | Provide stable external API doc; accept old forms if needed |
+| Manual remote mutation switch (if still present) | Replace with generated outbound registry |
+| Mixed error responses (string bodies) | Standardize JSON: `{ "error": "...", "code": 400 }` |
+
+---
+
+## 10. Potential Future Features
+
+| Feature | Value | Complexity |
+|---------|-------|------------|
+| Streaming `WatchState` RPC | Real-time cart updates for clients | Medium |
+| Event sourcing / audit log | Replay, analytics, debugging | High |
+| Promotion / coupon engine plugin | Business extensibility | Medium |
+| Partial cart reservation / inventory lock | Stock accuracy under concurrency | High |
+| Multi-currency pricing | Globalization | Medium |
+| GraphQL facade | Client flexibility | Medium |
+
+---
+
+## 11. Suggested Prioritized Backlog (Condensed)
+
+1. Coverage test + decode error mapping (P0)
+2. Proto regeneration & cleanup (P0)
+3. Metrics wrapper for registry (P1)
+4. Multi-node ownership integration test (P1)
+5. Delivery pricing abstraction (P2)
+6. Lease version in remote RPCs (P2)
+7. BatchMutate evaluation (P3)
+8. TLS / auth hardening (P3) if going multi-tenant/public
+9. Event sourcing (Evaluate after stability) (P4)
+
+---
+
+## 12. Simplifying the Developer Workflow
+
+| Pain | Simplifier |
+|------|------------|
+| Manual mutation boilerplate | Code generator for registry stubs |
+| Forgetting totals | Enforce WithTotals lint: fail if mutation touches items/deliveries without flag |
+| Hard to inspect remote ownership | `/internal/ownership` debug endpoint (JSON of local + remoteIndex) |
+| Hard to see mutation timings | Add `?debug=latency` header to return per-mutation durations |
+| Cookie dev confusion (Secure flag) | Env var: `DEV_INSECURE_COOKIES=1` |
+
+---
+
+## 13. Example: Mutation Codegen Sketch (Future)
+
+Input: cart_actor.proto  
+Output: `mutation_auto.go`
+- Detect messages used in RPC wrappers (e.g., `AddItemRequest` → payload field).
+- Generate `RegisterMutation` template if handler not found.
+- Mark with `// TODO implement logic`.
+
+---
+
+## 14. Risk / Impact Matrix (Abbreviated)
+
+| Change | Risk | Mitigation |
+|--------|------|-----------|
+| Replace remote switch with registry | Possible missing registration → runtime error | Coverage test gating CI |
+| Lease introduction | Split-brain if version mishandled | Increment + assert monotonic; test race |
+| BatchMutate | Large atomic operations starving others | Size limits & fair scheduling |
+| Event sourcing | Storage + replay complexity | Start with append-only log + compaction job |
+
+---
+
+## 15. Contributing Workflow (Proposed)
+
+1. Add / modify proto → run `make protogen`
+2. Implement mutation logic → add `RegisterMutation` invocation
+3. Add/Update tests (unit + integration)
+4. Run `make verify` (lint, test, coverage, proto diff)
+5. Open PR (template auto-checklist referencing this TODO)
+6. Merge requires green CI + coverage threshold
+
+---
+
+## 16. Open Questions
+
+| Question | Notes |
+|----------|-------|
+| Do we need sticky sessions for HTTP layer scaling? | Currently cart id routing suffices |
+| Should deliveries prune invalid line references on SetCartRequest? | Inconsistency risk; add optional cleanup |
+| Is checkout idempotency strict enough? | Multiple create vs update semantics |
+| Add version field to CartState for optimistic concurrency? | Could enable external CAS writes |
+
+---
+
+## 17. Tracking
+
+Mark any completed tasks with `[x]`:
+
+- [ ] Coverage test
+- [ ] Decode helper + 400 mapping
+- [ ] Proto cleanup
+- [ ] Registry metrics instrumentation
+- [ ] Ownership multi-node test
+- [ ] Lease versioning
+- [ ] Delivery pricing abstraction
+- [ ] TLS/mTLS internal
+- [ ] BatchMutate design doc
+
+---
+
+_Last updated: roadmap draft – refine after first metrics & scaling test run._

amqp-order-handler.go

@@ -1,83 +1,61 @@
 package main
 
 import (
-	"log"
+	"context"
+	"fmt"
+	"time"
 
 	amqp "github.com/rabbitmq/amqp091-go"
 )
 
 type AmqpOrderHandler struct {
 	Url        string
-	connection *amqp.Connection
-	//channel    *amqp.Channel
+	Connection *amqp.Connection
+	Channel    *amqp.Channel
 }
 
-const (
-	topic = "order-placed"
-)
-
-func (t *AmqpOrderHandler) Connect() error {
-
-	conn, err := amqp.DialConfig(t.Url, amqp.Config{
-		//Vhost:      "/",
-		Properties: amqp.NewConnectionProperties(),
-	})
-
+func (h *AmqpOrderHandler) Connect() error {
+	conn, err := amqp.Dial(h.Url)
 	if err != nil {
-		return err
+		return fmt.Errorf("failed to connect to RabbitMQ: %w", err)
 	}
-	t.connection = conn
+	h.Connection = conn
+
 	ch, err := conn.Channel()
 	if err != nil {
-		return err
-	}
-	defer ch.Close()
-	if err := ch.ExchangeDeclare(
-		topic,   // name
-		"topic", // type
-		true,    // durable
-		false,   // auto-delete
-		false,   // internal
-		false,   // noWait
-		nil,     // arguments
-	); err != nil {
-		return err
-	}
-
-	if _, err = ch.QueueDeclare(
-		topic, // name of the queue
-		true,  // durable
-		false, // delete when unused
-		false, // exclusive
-		false, // noWait
-		nil,   // arguments
-	); err != nil {
-		return err
+		return fmt.Errorf("failed to open a channel: %w", err)
 	}
+	h.Channel = ch
 
 	return nil
 }
 
-func (t *AmqpOrderHandler) Close() error {
-	log.Println("Closing master channel")
-	return t.connection.Close()
-	//return t.channel.Close()
+func (h *AmqpOrderHandler) Close() error {
+	if h.Channel != nil {
+		h.Channel.Close()
+	}
+	if h.Connection != nil {
+		return h.Connection.Close()
+	}
+	return nil
 }
 
-func (t *AmqpOrderHandler) OrderCompleted(data []byte) error {
-	ch, err := t.connection.Channel()
-	if err != nil {
-		return err
-	}
-	defer ch.Close()
-	return ch.Publish(
-		topic,
-		topic,
-		true,
-		false,
+func (h *AmqpOrderHandler) OrderCompleted(body []byte) error {
+	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
 		amqp.Publishing{
 			ContentType: "application/json",
-			Body:        data,
-		},
-	)
+			Body:        body,
+		})
+	if err != nil {
+		return fmt.Errorf("failed to publish a message: %w", err)
+	}
+
+	return nil
 }

cart-grain.go

@@ -1,19 +1,31 @@
 package main
 
 import (
-	"bytes"
 	"encoding/json"
 	"fmt"
-	"log"
-	"slices"
 	"sync"
-	"time"
 
 	messages "git.tornberg.me/go-cart-actor/proto"
 )
 
 type CartId [16]byte
 
+// String returns the cart id as a trimmed UTF-8 string (trailing zero bytes removed).
+func (id CartId) String() string {
+	n := 0
+	for n < len(id) && id[n] != 0 {
+		n++
+	}
+	return string(id[:n])
+}
+
+// ToCartId converts an arbitrary string to a fixed-size CartId (truncating or padding with zeros).
+func ToCartId(s string) CartId {
+	var id CartId
+	copy(id[:], []byte(s))
+	return id
+}
+
 func (id CartId) MarshalJSON() ([]byte, error) {
 	return json.Marshal(id.String())
 }
@@ -77,7 +89,6 @@ type CartGrain struct {
 	mu                sync.RWMutex
 	lastItemId        int
 	lastDeliveryId    int
-	storageMessages   []Message
 	Id                CartId          `json:"id"`
 	Items             []*CartItem     `json:"items"`
 	TotalPrice        int64           `json:"totalPrice"`
@@ -92,8 +103,8 @@ type CartGrain struct {
 
 type Grain interface {
 	GetId() CartId
-	HandleMessage(message *Message, isReplay bool) (*FrameWithPayload, error)
-	GetCurrentState() (*FrameWithPayload, error)
+	Apply(content interface{}, isReplay bool) (*CartGrain, error)
+	GetCurrentState() (*CartGrain, error)
 }
 
 func (c *CartGrain) GetId() CartId {
@@ -101,31 +112,19 @@ func (c *CartGrain) GetId() CartId {
 }
 
 func (c *CartGrain) GetLastChange() int64 {
-	if len(c.storageMessages) == 0 {
+	// Legacy event log removed; return 0 to indicate no persisted mutation history.
 	return 0
-	}
-	return *c.storageMessages[len(c.storageMessages)-1].TimeStamp
 }
 
-func (c *CartGrain) GetCurrentState() (*FrameWithPayload, error) {
-	result, err := json.Marshal(c)
-	if err != nil {
-		ret := MakeFrameWithPayload(0, 400, []byte(err.Error()))
-		return &ret, nil
-	}
-	ret := MakeFrameWithPayload(0, 200, result)
-	return &ret, nil
+func (c *CartGrain) GetCurrentState() (*CartGrain, error) {
+	return c, nil
 }
 
-func getInt(data interface{}) (int, error) {
-	switch v := data.(type) {
-	case float64:
-		return int(v), nil
-	case int:
-		return v, nil
-	default:
+func getInt(data float64, ok bool) (int, error) {
+	if !ok {
 		return 0, fmt.Errorf("invalid type")
 	}
+	return int(data), nil
 }
 
 func getItemData(sku string, qty int, country string) (*messages.AddItem, error) {
@@ -133,35 +132,36 @@ func getItemData(sku string, qty int, country string) (*messages.AddItem, error)
 	if err != nil {
 		return nil, err
 	}
-	orgPrice, _ := getInt(item.Fields[5])
+	orgPrice, _ := getInt(item.GetNumberFieldValue(5)) // getInt(item.Fields[5])
 
-	price, priceErr := getInt(item.Fields[4])
+	price, priceErr := getInt(item.GetNumberFieldValue(4)) //Fields[4]
 
 	if priceErr != nil {
 		return nil, fmt.Errorf("invalid price")
 	}
 
 	stock := InStock
+	/*item.t
 	if item.StockLevel == "0" || item.StockLevel == "" {
 		stock = OutOfStock
 	} else if item.StockLevel == "5+" {
 		stock = LowStock
-	}
-	articleType, _ := item.Fields[1].(string)
-	outletGrade, ok := item.Fields[20].(string)
+		}*/
+	articleType, _ := item.GetStringFieldValue(1)   //.Fields[1].(string)
+	outletGrade, ok := item.GetStringFieldValue(20) //.Fields[20].(string)
 	var outlet *string
 	if ok {
 		outlet = &outletGrade
 	}
-	sellerId, _ := item.Fields[24].(string)
-	sellerName, _ := item.Fields[9].(string)
+	sellerId, _ := item.GetStringFieldValue(24)  // .Fields[24].(string)
+	sellerName, _ := item.GetStringFieldValue(9) // .Fields[9].(string)
 
-	brand, _ := item.Fields[2].(string)
-	category, _ := item.Fields[10].(string)
-	category2, _ := item.Fields[11].(string)
-	category3, _ := item.Fields[12].(string)
-	category4, _ := item.Fields[13].(string)
-	category5, _ := item.Fields[14].(string)
+	brand, _ := item.GetStringFieldValue(2)      //.Fields[2].(string)
+	category, _ := item.GetStringFieldValue(10)  //.Fields[10].(string)
+	category2, _ := item.GetStringFieldValue(11) //.Fields[11].(string)
+	category3, _ := item.GetStringFieldValue(12) //.Fields[12].(string)
+	category4, _ := item.GetStringFieldValue(13) //Fields[13].(string)
+	category5, _ := item.GetStringFieldValue(14) //.Fields[14].(string)
 
 	return &messages.AddItem{
 		ItemId:      int64(item.Id),
@@ -188,30 +188,23 @@ func getItemData(sku string, qty int, country string) (*messages.AddItem, error)
 	}, nil
 }
 
-func (c *CartGrain) AddItem(sku string, qty int, country string, storeId *string) (*FrameWithPayload, error) {
+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.HandleMessage(&Message{
-		Type:    2,
-		Content: cartItem,
-	}, false)
+	return c.Apply(cartItem, false)
 }
 
-func (c *CartGrain) GetStorageMessage(since int64) []StorableMessage {
-	c.mu.RLock()
-	defer c.mu.RUnlock()
-	ret := make([]StorableMessage, 0)
+/*
+Legacy storage (event sourcing) removed in oneof refactor.
+Kept stub (commented) for potential future reintroduction using proto envelopes.
 
-	for _, message := range c.storageMessages {
-		if *message.TimeStamp > since {
-			ret = append(ret, message)
-		}
-	}
-	return ret
+func (c *CartGrain) GetStorageMessage(since int64) []interface{} {
+	return nil
 }
+*/
 
 func (c *CartGrain) GetState() ([]byte, error) {
 	return json.Marshal(c)
@@ -266,324 +259,17 @@ func GetTaxAmount(total int64, tax int) int64 {
 	return int64(float64(total) / float64((1 + taxD)))
 }
 
-func (c *CartGrain) HandleMessage(message *Message, isReplay bool) (*FrameWithPayload, error) {
-	if message.TimeStamp == nil {
-		now := time.Now().Unix()
-		message.TimeStamp = &now
-	}
+func (c *CartGrain) Apply(content interface{}, isReplay bool) (*CartGrain, error) {
 	grainMutations.Inc()
-	var err error
-	switch message.Type {
-	case SetCartItemsType:
-		msg, ok := message.Content.(*messages.SetCartRequest)
-		if !ok {
-			err = fmt.Errorf("expected SetCartItems")
-		} else {
 
-			c.mu.Lock()
-			c.Items = make([]*CartItem, 0, len(msg.Items))
-			c.mu.Unlock()
-			for _, item := range msg.Items {
-				c.AddItem(item.Sku, int(item.Quantity), item.Country, item.StoreId)
-			}
-
-		}
-	case AddRequestType:
-		msg, ok := message.Content.(*messages.AddRequest)
-		if !ok {
-			err = fmt.Errorf("expected AddRequest")
-		} else {
-
-			existingItem, found := c.FindItemWithSku(msg.Sku)
-			if found {
-				existingItem.Quantity += int(msg.Quantity)
-				c.UpdateTotals()
-			} else {
-				return c.AddItem(msg.Sku, int(msg.Quantity), msg.Country, msg.StoreId)
-			}
-
-		}
-	case AddItemType:
-		msg, ok := message.Content.(*messages.AddItem)
-		if !ok {
-			err = fmt.Errorf("expected AddItem")
-		} else {
-
-			if msg.Quantity < 1 {
-				return nil, fmt.Errorf("invalid quantity")
-			}
-			existingItem, found := c.FindItemWithSku(msg.Sku)
-			if found {
-				existingItem.Quantity += int(msg.Quantity)
-				c.UpdateTotals()
-			} else {
-				c.mu.Lock()
-				c.lastItemId++
-				tax := 2500
-				if msg.Tax > 0 {
-					tax = int(msg.Tax)
-				}
-
-				taxAmount := GetTaxAmount(msg.Price, tax)
-
-				c.Items = append(c.Items, &CartItem{
-					Id:          c.lastItemId,
-					ItemId:      int(msg.ItemId),
-					Quantity:    int(msg.Quantity),
-					Sku:         msg.Sku,
-					Name:        msg.Name,
-					Price:       msg.Price,
-					TotalPrice:  msg.Price * int64(msg.Quantity),
-					TotalTax:    int64(taxAmount * int64(msg.Quantity)),
-					Image:       msg.Image,
-					Stock:       StockStatus(msg.Stock),
-					Disclaimer:  msg.Disclaimer,
-					Brand:       msg.Brand,
-					Category:    msg.Category,
-					Category2:   msg.Category2,
-					Category3:   msg.Category3,
-					Category4:   msg.Category4,
-					Category5:   msg.Category5,
-					OrgPrice:    msg.OrgPrice,
-					ArticleType: msg.ArticleType,
-					Outlet:      msg.Outlet,
-					SellerId:    msg.SellerId,
-					SellerName:  msg.SellerName,
-					Tax:         int(taxAmount),
-					TaxRate:     tax,
-					StoreId:     msg.StoreId,
-				})
-				c.UpdateTotals()
-				c.mu.Unlock()
-			}
-
-		}
-	case ChangeQuantityType:
-		msg, ok := message.Content.(*messages.ChangeQuantity)
-		if !ok {
-			err = fmt.Errorf("expected ChangeQuantity")
-		} else {
-
-			for i, item := range c.Items {
-				if item.Id == int(msg.Id) {
-					if msg.Quantity <= 0 {
-						//c.TotalPrice -= item.Price * int64(item.Quantity)
-						c.Items = append(c.Items[:i], c.Items[i+1:]...)
-					} else {
-						//diff := int(msg.Quantity) - item.Quantity
-						item.Quantity = int(msg.Quantity)
-						//c.TotalPrice += item.Price * int64(diff)
-					}
-
-					break
-				}
-			}
-			c.UpdateTotals()
-
-		}
-	case RemoveItemType:
-		msg, ok := message.Content.(*messages.RemoveItem)
-		if !ok {
-			err = fmt.Errorf("expected RemoveItem")
-		} else {
-
-			items := make([]*CartItem, 0, len(c.Items))
-			for _, item := range c.Items {
-				if item.Id == int(msg.Id) {
-					//c.TotalPrice -= item.Price * int64(item.Quantity)
-				} else {
-					items = append(items, item)
-				}
-			}
-			c.Items = items
-			c.UpdateTotals()
-		}
-	case SetDeliveryType:
-		msg, ok := message.Content.(*messages.SetDelivery)
-		if !ok {
-			err = fmt.Errorf("expected SetDelivery")
-		} else {
-
-			c.lastDeliveryId++
-			items := make([]int, 0)
-			withDelivery := c.ItemsWithDelivery()
-			if len(msg.Items) == 0 {
-				items = append(items, c.ItemsWithoutDelivery()...)
-			} else {
-				for _, id := range msg.Items {
-					for _, item := range c.Items {
-						if item.Id == int(id) {
-							if slices.Contains(withDelivery, item.Id) {
-								return nil, fmt.Errorf("item already has delivery")
-							}
-							items = append(items, int(item.Id))
-							break
-						}
-					}
-				}
-			}
-			if len(items) > 0 {
-				c.Deliveries = append(c.Deliveries, &CartDelivery{
-					Id:          c.lastDeliveryId,
-					Provider:    msg.Provider,
-					PickupPoint: msg.PickupPoint,
-					Price:       4900,
-					Items:       items,
-				})
-
-				c.UpdateTotals()
-
-			}
-
-		}
-	case RemoveDeliveryType:
-		msg, ok := message.Content.(*messages.RemoveDelivery)
-		if !ok {
-			err = fmt.Errorf("expected RemoveDelivery")
-		} else {
-
-			deliveries := make([]*CartDelivery, 0, len(c.Deliveries))
-			for _, delivery := range c.Deliveries {
-				if delivery.Id == int(msg.Id) {
-					c.TotalPrice -= delivery.Price
-				} else {
-					deliveries = append(deliveries, delivery)
-				}
-			}
-			c.Deliveries = deliveries
-			c.UpdateTotals()
-		}
-	case SetPickupPointType:
-		msg, ok := message.Content.(*messages.SetPickupPoint)
-		if !ok {
-			err = fmt.Errorf("expected SetPickupPoint")
-		} else {
-
-			for _, delivery := range c.Deliveries {
-				if delivery.Id == int(msg.DeliveryId) {
-					delivery.PickupPoint = &messages.PickupPoint{
-						Id:      msg.Id,
-						Address: msg.Address,
-						City:    msg.City,
-						Zip:     msg.Zip,
-						Country: msg.Country,
-						Name:    msg.Name,
-					}
-					break
-				}
-			}
-
-		}
-	case CreateCheckoutOrderType:
-		msg, ok := message.Content.(*messages.CreateCheckoutOrder)
-		if !ok {
-			err = fmt.Errorf("expected CreateCheckoutOrder")
-		} else {
-
-			orderLines := make([]*Line, 0, len(c.Items))
-
-			c.PaymentInProgress = true
-			c.Processing = true
-			for _, item := range c.Items {
-
-				orderLines = append(orderLines, &Line{
-					Type:           "physical",
-					Reference:      item.Sku,
-					Name:           item.Name,
-					Quantity:       item.Quantity,
-					UnitPrice:      int(item.Price),
-					TaxRate:        2500, // item.TaxRate,
-					QuantityUnit:   "st",
-					TotalAmount:    int(item.TotalPrice),
-					TotalTaxAmount: int(item.TotalTax),
-					ImageURL:       fmt.Sprintf("https://www.elgiganten.se%s", item.Image),
-				})
-			}
-			for _, line := range c.Deliveries {
-				if line.Price > 0 {
-					orderLines = append(orderLines, &Line{
-						Type:           "shipping_fee",
-						Reference:      line.Provider,
-						Name:           "Delivery",
-						Quantity:       1,
-						UnitPrice:      int(line.Price),
-						TaxRate:        2500, // item.TaxRate,
-						QuantityUnit:   "st",
-						TotalAmount:    int(line.Price),
-						TotalTaxAmount: int(GetTaxAmount(line.Price, 2500)),
-					})
-				}
-			}
-			order := CheckoutOrder{
-				PurchaseCountry:    "SE",
-				PurchaseCurrency:   "SEK",
-				Locale:             "sv-se",
-				OrderAmount:        int(c.TotalPrice),
-				OrderTaxAmount:     int(c.TotalTax),
-				OrderLines:         orderLines,
-				MerchantReference1: c.Id.String(),
-				MerchantURLS: &CheckoutMerchantURLS{
-					Terms:        msg.Terms,
-					Checkout:     msg.Checkout,
-					Confirmation: msg.Confirmation,
-					Validation:   msg.Validation,
-					Push:         msg.Push,
-				},
-			}
-			orderPayload, err := json.Marshal(order)
+	updated, err := ApplyRegistered(c, content)
 	if err != nil {
+		if err == ErrMutationNotRegistered {
+			return nil, fmt.Errorf("unsupported mutation type %T (not registered)", content)
+		}
 		return nil, err
 	}
-			var klarnaOrder *CheckoutOrder
-			if c.OrderReference != "" {
-				log.Printf("Updating order id %s", c.OrderReference)
-				klarnaOrder, err = KlarnaInstance.UpdateOrder(c.OrderReference, bytes.NewReader(orderPayload))
-			} else {
-				klarnaOrder, err = KlarnaInstance.CreateOrder(bytes.NewReader(orderPayload))
-			}
-			// log.Printf("Order result: %+v", klarnaOrder)
-			if nil != err {
-				log.Printf("error from klarna: %v", err)
-				return nil, err
-			}
-			if c.OrderReference == "" {
-				c.OrderReference = klarnaOrder.ID
-				c.PaymentStatus = klarnaOrder.Status
-			}
-
-			orderData, err := json.Marshal(klarnaOrder)
-			if nil != err {
-				return nil, err
-			}
-
-			result := MakeFrameWithPayload(RemoteCreateOrderReply, 200, orderData)
-			return &result, nil
-		}
-	case OrderCompletedType:
-		msg, ok := message.Content.(*messages.OrderCreated)
-		if !ok {
-			log.Printf("expected OrderCompleted, got %T", message.Content)
-			err = fmt.Errorf("expected OrderCompleted")
-		} else {
-			c.OrderReference = msg.OrderId
-			c.PaymentStatus = msg.Status
-			c.PaymentInProgress = false
-		}
-	default:
-		err = fmt.Errorf("unknown message type %d", message.Type)
-	}
-	if err != nil {
-		return nil, err
-	}
-
-	if !isReplay {
-		c.mu.Lock()
-		c.storageMessages = append(c.storageMessages, *message)
-		c.mu.Unlock()
-	}
-	result, err := json.Marshal(c)
-	msg := MakeFrameWithPayload(RemoteHandleMutationReply, 200, result)
-	return &msg, err
+	return updated, nil
 }
 
 func (c *CartGrain) UpdateTotals() {

cart-grain_test.go

@@ -1,248 +0,0 @@
-package main
-
-import (
-	"testing"
-	"time"
-
-	messages "git.tornberg.me/go-cart-actor/proto"
-)
-
-func GetMessage(t uint16, data interface{}) *Message {
-	ts := time.Now().Unix()
-	return &Message{
-		TimeStamp: &ts,
-		Type:      t,
-		Content:   data,
-	}
-}
-
-func TestTaxAmount(t *testing.T) {
-	taxAmount := GetTaxAmount(12500, 2500)
-	if taxAmount != 2500 {
-		t.Errorf("Expected 2500, got %d\n", taxAmount)
-	}
-}
-
-func TestAddToCartShortCut(t *testing.T) {
-	grain, err := spawn(ToCartId("kalle"))
-	if err != nil {
-		t.Errorf("Error spawning: %v\n", err)
-	}
-	if len(grain.Items) != 0 {
-		t.Errorf("Expected 0 items, got %d\n", len(grain.Items))
-	}
-	msg := GetMessage(AddItemType, &messages.AddItem{
-		Quantity: 2,
-		Price:    100,
-		Sku:      "123",
-		Name:     "Test item",
-		Image:    "test.jpg",
-	})
-
-	_, err = grain.HandleMessage(msg, false)
-	if err != nil {
-		t.Errorf("Error handling message: %v\n", err)
-	}
-	if len(grain.Items) != 1 {
-		t.Errorf("Expected 1 item, got %d\n", len(grain.Items))
-	}
-	if grain.Items[0].Quantity != 2 {
-		t.Errorf("Expected quantity 2, got %d\n", grain.Items[0].Quantity)
-	}
-	if len(grain.storageMessages) != 1 {
-		t.Errorf("Expected 1 storage message, got %d\n", len(grain.storageMessages))
-	}
-	shortCutMessage := GetMessage(AddRequestType, &messages.AddRequest{
-		Quantity: 2,
-		Sku:      "123",
-	})
-	_, err = grain.HandleMessage(shortCutMessage, false)
-	if err != nil {
-		t.Errorf("Error handling message: %v\n", err)
-	}
-	if len(grain.Items) != 1 {
-		t.Errorf("Expected 1 item, got %d\n", len(grain.Items))
-	}
-	if len(grain.storageMessages) != 2 {
-		t.Errorf("Expected 2 storage message, got %d\n", len(grain.storageMessages))
-	}
-	if grain.storageMessages[0].Type != AddItemType {
-		t.Errorf("Expected AddItemType, got %d\n", grain.storageMessages[0].Type)
-	}
-	if grain.storageMessages[1].Type != AddRequestType {
-		t.Errorf("Expected AddRequestType, got %d\n", grain.storageMessages[1].Type)
-	}
-}
-
-func TestAddRequestToGrain(t *testing.T) {
-	grain, err := spawn(ToCartId("kalle"))
-	if err != nil {
-		t.Errorf("Error spawning: %v\n", err)
-	}
-	msg := GetMessage(AddRequestType, &messages.AddRequest{
-		Quantity: 2,
-		Sku:      "763281",
-	})
-	result, err := grain.HandleMessage(msg, false)
-	if err != nil {
-		t.Errorf("Error handling message: %v\n", err)
-	}
-	if result.StatusCode != 200 {
-		t.Errorf("Call failed\n")
-	}
-	t.Log(result)
-}
-
-func TestAddToCart(t *testing.T) {
-	grain, err := spawn(ToCartId("kalle"))
-	if err != nil {
-		t.Errorf("Error spawning: %v\n", err)
-	}
-	if len(grain.Items) != 0 {
-		t.Errorf("Expected 0 items, got %d\n", len(grain.Items))
-	}
-	msg := GetMessage(AddItemType, &messages.AddItem{
-		Quantity: 2,
-		Price:    100,
-		Sku:      "123",
-		Name:     "Test item",
-		Image:    "test.jpg",
-	})
-
-	result, err := grain.HandleMessage(msg, false)
-
-	if err != nil {
-		t.Errorf("Error handling message: %v\n", err)
-	}
-	if result.StatusCode != 200 {
-		t.Errorf("Call failed\n")
-	}
-	if grain.TotalPrice != 200 {
-		t.Errorf("Expected total price 200, got %d\n", grain.TotalPrice)
-	}
-	if len(grain.Items) != 1 {
-		t.Errorf("Expected 1 item, got %d\n", len(grain.Items))
-	}
-	if grain.Items[0].Quantity != 2 {
-		t.Errorf("Expected quantity 2, got %d\n", grain.Items[0].Quantity)
-	}
-	result, err = grain.HandleMessage(msg, false)
-	if err != nil {
-		t.Errorf("Error handling message: %v\n", err)
-	}
-	if result.StatusCode != 200 {
-		t.Errorf("Call failed\n")
-	}
-	if grain.Items[0].Quantity != 4 {
-		t.Errorf("Expected quantity 4, got %d\n", grain.Items[0].Quantity)
-	}
-	if grain.TotalPrice != 400 {
-		t.Errorf("Expected total price 400, got %d\n", grain.TotalPrice)
-	}
-}
-
-func TestSetDelivery(t *testing.T) {
-	grain, err := spawn(ToCartId("kalle"))
-	if err != nil {
-		t.Errorf("Error spawning: %v\n", err)
-	}
-	if len(grain.Items) != 0 {
-		t.Errorf("Expected 0 items, got %d\n", len(grain.Items))
-	}
-	msg := GetMessage(AddItemType, &messages.AddItem{
-		Quantity: 2,
-		Price:    100,
-		Sku:      "123",
-		Name:     "Test item",
-		Image:    "test.jpg",
-	})
-
-	grain.HandleMessage(msg, false)
-
-	msg = GetMessage(AddItemType, &messages.AddItem{
-		Quantity: 2,
-		Price:    100,
-		Sku:      "123",
-		Name:     "Test item",
-		Image:    "test.jpg",
-	})
-
-	result, err := grain.HandleMessage(msg, false)
-
-	if err != nil {
-		t.Errorf("Error handling message: %v\n", err)
-	}
-	if result.StatusCode != 200 {
-		t.Errorf("Call failed\n")
-	}
-
-	setDelivery := GetMessage(SetDeliveryType, &messages.SetDelivery{
-		Provider: "test",
-		Items:    []int64{1},
-	})
-
-	_, err = grain.HandleMessage(setDelivery, false)
-	if err != nil {
-		t.Errorf("Error handling message: %v\n", err)
-	}
-	if len(grain.Deliveries) != 1 {
-		t.Errorf("Expected 1 delivery, got %d\n", len(grain.Deliveries))
-	}
-	if len(grain.Deliveries[0].Items) != 1 {
-		t.Errorf("Expected 1 items in delivery, got %d\n", len(grain.Deliveries[0].Items))
-	}
-}
-
-func TestSetDeliveryOnAll(t *testing.T) {
-	grain, err := spawn(ToCartId("kalle"))
-	if err != nil {
-		t.Errorf("Error spawning: %v\n", err)
-	}
-	if len(grain.Items) != 0 {
-		t.Errorf("Expected 0 items, got %d\n", len(grain.Items))
-	}
-	msg := GetMessage(AddItemType, &messages.AddItem{
-		Quantity: 2,
-		Price:    100,
-		Sku:      "123",
-		Name:     "Test item",
-		Image:    "test.jpg",
-	})
-
-	grain.HandleMessage(msg, false)
-
-	msg = GetMessage(AddItemType, &messages.AddItem{
-		Quantity: 2,
-		Price:    100,
-		Sku:      "1233",
-		Name:     "Test item2",
-		Image:    "test.jpg",
-	})
-
-	result, err := grain.HandleMessage(msg, false)
-
-	if err != nil {
-		t.Errorf("Error handling message: %v\n", err)
-	}
-	if result.StatusCode != 200 {
-		t.Errorf("Call failed\n")
-	}
-
-	setDelivery := GetMessage(SetDeliveryType, &messages.SetDelivery{
-		Provider: "test",
-		Items:    []int64{},
-	})
-
-	_, err = grain.HandleMessage(setDelivery, false)
-	if err != nil {
-		t.Errorf("Error handling message: %v\n", err)
-	}
-	if len(grain.Deliveries) != 1 {
-		t.Errorf("Expected 1 delivery, got %d\n", len(grain.Deliveries))
-	}
-
-	if len(grain.Deliveries[0].Items) != 2 {
-		t.Errorf("Expected 2 items in delivery, got %d\n", len(grain.Deliveries[0].Items))
-	}
-
-}

cart_state_mapper.go

@@ -0,0 +1,211 @@
+package main
+
+import (
+	messages "git.tornberg.me/go-cart-actor/proto"
+)
+
+// cart_state_mapper.go
+//
+// Utilities to translate between internal CartGrain state and the gRPC
+// (typed) protobuf representation CartState. This replaces the previous
+// JSON blob framing and enables type-safe replies over gRPC, as well as
+// internal reuse for HTTP handlers without an extra marshal / unmarshal
+// hop (you can marshal CartState directly for JSON responses if desired).
+//
+// Only the one‑way mapping (CartGrain -> CartState) is strictly required
+// for mutation / state replies. A reverse helper is included in case
+// future features (e.g. snapshot import, replay, or migration) need it.
+
+// ToCartState converts the in‑memory CartGrain into a protobuf CartState.
+func ToCartState(c *CartGrain) *messages.CartState {
+	if c == nil {
+		return nil
+	}
+
+	items := make([]*messages.CartItemState, 0, len(c.Items))
+	for _, it := range c.Items {
+		if it == nil {
+			continue
+		}
+		itemDiscountPerUnit := max(0, it.OrgPrice-it.Price)
+		itemTotalDiscount := itemDiscountPerUnit * int64(it.Quantity)
+
+		items = append(items, &messages.CartItemState{
+			Id:            int64(it.Id),
+			SourceItemId:  int64(it.ItemId),
+			Sku:           it.Sku,
+			Name:          it.Name,
+			UnitPrice:     it.Price,
+			Quantity:      int32(it.Quantity),
+			TotalPrice:    it.TotalPrice,
+			TotalTax:      it.TotalTax,
+			OrgPrice:      it.OrgPrice,
+			TaxRate:       int32(it.TaxRate),
+			TotalDiscount: itemTotalDiscount,
+			Brand:         it.Brand,
+			Category:      it.Category,
+			Category2:     it.Category2,
+			Category3:     it.Category3,
+			Category4:     it.Category4,
+			Category5:     it.Category5,
+			Image:         it.Image,
+			ArticleType:   it.ArticleType,
+			SellerId:      it.SellerId,
+			SellerName:    it.SellerName,
+			Disclaimer:    it.Disclaimer,
+			Outlet:        deref(it.Outlet),
+			StoreId:       deref(it.StoreId),
+			Stock:         int32(it.Stock),
+		})
+	}
+
+	deliveries := make([]*messages.DeliveryState, 0, len(c.Deliveries))
+	for _, d := range c.Deliveries {
+		if d == nil {
+			continue
+		}
+		itemIds := make([]int64, 0, len(d.Items))
+		for _, id := range d.Items {
+			itemIds = append(itemIds, int64(id))
+		}
+		var pp *messages.PickupPoint
+		if d.PickupPoint != nil {
+			// Copy to avoid accidental shared mutation (proto points are fine but explicit).
+			pp = &messages.PickupPoint{
+				Id:      d.PickupPoint.Id,
+				Name:    d.PickupPoint.Name,
+				Address: d.PickupPoint.Address,
+				City:    d.PickupPoint.City,
+				Zip:     d.PickupPoint.Zip,
+				Country: d.PickupPoint.Country,
+			}
+		}
+		deliveries = append(deliveries, &messages.DeliveryState{
+			Id:          int64(d.Id),
+			Provider:    d.Provider,
+			Price:       d.Price,
+			ItemIds:     itemIds,
+			PickupPoint: pp,
+		})
+	}
+
+	return &messages.CartState{
+		CartId:            c.Id.String(),
+		Items:             items,
+		TotalPrice:        c.TotalPrice,
+		TotalTax:          c.TotalTax,
+		TotalDiscount:     c.TotalDiscount,
+		Deliveries:        deliveries,
+		PaymentInProgress: c.PaymentInProgress,
+		OrderReference:    c.OrderReference,
+		PaymentStatus:     c.PaymentStatus,
+	}
+}
+
+// FromCartState merges a protobuf CartState into an existing CartGrain.
+// This is optional and primarily useful for snapshot import or testing.
+func FromCartState(cs *messages.CartState, g *CartGrain) *CartGrain {
+	if cs == nil {
+		return g
+	}
+	if g == nil {
+		g = &CartGrain{}
+	}
+	g.Id = ToCartId(cs.CartId)
+	g.TotalPrice = cs.TotalPrice
+	g.TotalTax = cs.TotalTax
+	g.TotalDiscount = cs.TotalDiscount
+	g.PaymentInProgress = cs.PaymentInProgress
+	g.OrderReference = cs.OrderReference
+	g.PaymentStatus = cs.PaymentStatus
+
+	// Items
+	g.Items = g.Items[:0]
+	for _, it := range cs.Items {
+		if it == nil {
+			continue
+		}
+		outlet := toPtr(it.Outlet)
+		storeId := toPtr(it.StoreId)
+		g.Items = append(g.Items, &CartItem{
+			Id:          int(it.Id),
+			ItemId:      int(it.SourceItemId),
+			Sku:         it.Sku,
+			Name:        it.Name,
+			Price:       it.UnitPrice,
+			Quantity:    int(it.Quantity),
+			TotalPrice:  it.TotalPrice,
+			TotalTax:    it.TotalTax,
+			OrgPrice:    it.OrgPrice,
+			TaxRate:     int(it.TaxRate),
+			Brand:       it.Brand,
+			Category:    it.Category,
+			Category2:   it.Category2,
+			Category3:   it.Category3,
+			Category4:   it.Category4,
+			Category5:   it.Category5,
+			Image:       it.Image,
+			ArticleType: it.ArticleType,
+			SellerId:    it.SellerId,
+			SellerName:  it.SellerName,
+			Disclaimer:  it.Disclaimer,
+			Outlet:      outlet,
+			StoreId:     storeId,
+			Stock:       StockStatus(it.Stock),
+			// Tax, TaxRate already set via Price / Totals if needed
+		})
+		if it.Id > int64(g.lastItemId) {
+			g.lastItemId = int(it.Id)
+		}
+	}
+
+	// Deliveries
+	g.Deliveries = g.Deliveries[:0]
+	for _, d := range cs.Deliveries {
+		if d == nil {
+			continue
+		}
+		intIds := make([]int, 0, len(d.ItemIds))
+		for _, id := range d.ItemIds {
+			intIds = append(intIds, int(id))
+		}
+		var pp *messages.PickupPoint
+		if d.PickupPoint != nil {
+			pp = &messages.PickupPoint{
+				Id:      d.PickupPoint.Id,
+				Name:    d.PickupPoint.Name,
+				Address: d.PickupPoint.Address,
+				City:    d.PickupPoint.City,
+				Zip:     d.PickupPoint.Zip,
+				Country: d.PickupPoint.Country,
+			}
+		}
+		g.Deliveries = append(g.Deliveries, &CartDelivery{
+			Id:          int(d.Id),
+			Provider:    d.Provider,
+			Price:       d.Price,
+			Items:       intIds,
+			PickupPoint: pp,
+		})
+		if d.Id > int64(g.lastDeliveryId) {
+			g.lastDeliveryId = int(d.Id)
+		}
+	}
+
+	return g
+}
+
+// Helper to safely de-reference optional string pointers to value or "".
+func deref(p *string) string {
+	if p == nil {
+		return ""
+	}
+	return *p
+}
+
+func toPtr(s string) *string {
+	if s == "" {
+		return nil
+	}
+	return &s
+}

checkout_builder.go

@@ -0,0 +1,119 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+// CheckoutMeta carries the external / URL metadata required to build a
+// Klarna CheckoutOrder from a CartGrain snapshot. It deliberately excludes
+// any Klarna-specific response fields (HTML snippet, client token, etc.).
+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)
+}
+
+// BuildCheckoutOrderPayload converts the current cart grain + meta information
+// into a CheckoutOrder domain struct and returns its JSON-serialized payload
+// (to send to Klarna) alongside the structured CheckoutOrder object.
+//
+// This function is PURE: it does not perform any network I/O or mutate the
+// grain. The caller is responsible for:
+//
+//  1. Choosing whether to create or update the Klarna order.
+//  2. Invoking KlarnaClient.CreateOrder / UpdateOrder with the returned payload.
+//  3. Applying an InitializeCheckout mutation (or equivalent) with the
+//     resulting Klarna order id + status.
+//
+// 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) {
+	if grain == nil {
+		return nil, nil, fmt.Errorf("nil grain")
+	}
+	if meta == nil {
+		return nil, nil, fmt.Errorf("nil checkout meta")
+	}
+
+	currency := meta.Currency
+	if currency == "" {
+		currency = "SEK"
+	}
+	locale := meta.Locale
+	if locale == "" {
+		locale = "sv-se"
+	}
+	country := meta.Country
+	if country == "" {
+		country = "SE" // sensible default; adjust if multi-country support changes
+	}
+
+	lines := make([]*Line, 0, len(grain.Items)+len(grain.Deliveries))
+
+	// Item lines
+	for _, it := range grain.Items {
+		if it == nil {
+			continue
+		}
+		lines = append(lines, &Line{
+			Type:           "physical",
+			Reference:      it.Sku,
+			Name:           it.Name,
+			Quantity:       it.Quantity,
+			UnitPrice:      int(it.Price),
+			TaxRate:        2500, // TODO: derive if variable tax rates are introduced
+			QuantityUnit:   "st",
+			TotalAmount:    int(it.TotalPrice),
+			TotalTaxAmount: int(it.TotalTax),
+			ImageURL:       fmt.Sprintf("https://www.elgiganten.se%s", it.Image),
+		})
+	}
+
+	// Delivery lines
+	for _, d := range grain.Deliveries {
+		if d == nil || d.Price <= 0 {
+			continue
+		}
+		lines = append(lines, &Line{
+			Type:           "shipping_fee",
+			Reference:      d.Provider,
+			Name:           "Delivery",
+			Quantity:       1,
+			UnitPrice:      int(d.Price),
+			TaxRate:        2500,
+			QuantityUnit:   "st",
+			TotalAmount:    int(d.Price),
+			TotalTaxAmount: int(GetTaxAmount(d.Price, 2500)),
+		})
+	}
+
+	order := &CheckoutOrder{
+		PurchaseCountry:    country,
+		PurchaseCurrency:   currency,
+		Locale:             locale,
+		OrderAmount:        int(grain.TotalPrice),
+		OrderTaxAmount:     int(grain.TotalTax),
+		OrderLines:         lines,
+		MerchantReference1: grain.Id.String(),
+		MerchantURLS: &CheckoutMerchantURLS{
+			Terms:        meta.Terms,
+			Checkout:     meta.Checkout,
+			Confirmation: meta.Confirmation,
+			Validation:   meta.Validation,
+			Push:         meta.Push,
+		},
+	}
+
+	payload, err := json.Marshal(order)
+	if err != nil {
+		return nil, nil, fmt.Errorf("marshal checkout order: %w", err)
+	}
+
+	return payload, order, nil
+}

cookies.txt

@@ -0,0 +1,5 @@
+# Netscape HTTP Cookie File
+# https://curl.se/docs/http-cookies.html
+# This file was generated by libcurl! Edit at your own risk.
+
+#HttpOnly_localhost	FALSE	/	FALSE	1761304670	cartid	4393545184291837

discarded-host.go

@@ -9,7 +9,6 @@ import (
 )
 
 type DiscardedHost struct {
-	*Connection
 	Host  string
 	Tries int
 }
@@ -26,7 +25,7 @@ func (d *DiscardedHostHandler) run() {
 		d.mu.RLock()
 		lst := make([]*DiscardedHost, 0, len(d.hosts))
 		for _, host := range d.hosts {
-			if host.Tries >= 0 || host.Tries < 5 {
+			if host.Tries >= 0 && host.Tries < 5 {
 				go d.testConnection(host)
 				lst = append(lst, host)
 			} else {
@@ -49,7 +48,9 @@ func (d *DiscardedHostHandler) testConnection(host *DiscardedHost) {
 
 	if err != nil {
 		host.Tries++
-		host.Tries = -1
+		if host.Tries >= 5 {
+			// Exceeded retry threshold; will be dropped by run loop.
+		}
 	} else {
 		conn.Close()
 		if d.onConnection != nil {

discarded-host_test.go

@@ -1,18 +0,0 @@
-package main
-
-import (
-	"testing"
-	"time"
-)
-
-func TestDiscardedHost(t *testing.T) {
-	dh := NewDiscardedHostHandler(8080)
-	dh.SetReconnectHandler(func(host string) {
-		t.Log(host)
-	})
-	dh.AppendHost("localhost")
-	time.Sleep(2 * time.Second)
-	if dh.hosts[0].Tries == 0 {
-		t.Error("Host not tested")
-	}
-}

discovery_test.go

@@ -9,7 +9,7 @@ import (
 )
 
 func TestDiscovery(t *testing.T) {
-	config, err := clientcmd.BuildConfigFromFlags("", "/Users/mats/.kube/config")
+	config, err := clientcmd.BuildConfigFromFlags("", "/home/mats/.kube/config")
 	if err != nil {
 		t.Errorf("Error building config: %v", err)
 	}
@@ -28,7 +28,7 @@ func TestDiscovery(t *testing.T) {
 }
 
 func TestWatch(t *testing.T) {
-	config, err := clientcmd.BuildConfigFromFlags("", "/Users/mats/.kube/config")
+	config, err := clientcmd.BuildConfigFromFlags("", "/home/mats/.kube/config")
 	if err != nil {
 		t.Errorf("Error building config: %v", err)
 	}

disk-storage.go

@@ -3,7 +3,6 @@ package main
 import (
 	"encoding/gob"
 	"fmt"
-	"log"
 	"os"
 	"time"
 )
@@ -23,59 +22,18 @@ func NewDiskStorage(stateFile string) (*DiskStorage, error) {
 	return ret, err
 }
 
-func saveMessages(messages []StorableMessage, id CartId) error {
-
-	if len(messages) == 0 {
+func saveMessages(_ interface{}, _ CartId) error {
+	// No-op: legacy event log persistence removed in oneof refactor.
 	return nil
-	}
-	log.Printf("%d messages to save for grain id %s", len(messages), id)
-	var file *os.File
-	var err error
-	path := getCartPath(id.String())
-	file, err = os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
-	if err != nil {
-		return err
-	}
-	defer file.Close()
-
-	for _, m := range messages {
-		err := m.Write(file)
-		if err != nil {
-			return err
-		}
-	}
-	return err
 }
 
 func getCartPath(id string) string {
 	return fmt.Sprintf("data/%s.prot", id)
 }
 
-func loadMessages(grain Grain, id CartId) error {
-	var err error
-	path := getCartPath(id.String())
-
-	file, err := os.Open(path)
-	if err != nil {
-		if os.IsNotExist(err) {
+func loadMessages(_ Grain, _ CartId) error {
+	// No-op: legacy replay removed in oneof refactor.
 	return nil
-		}
-		return err
-	}
-	defer file.Close()
-
-	for err == nil {
-		var msg Message
-		err = ReadMessage(file, &msg)
-		if err == nil {
-			grain.HandleMessage(&msg, true)
-		}
-	}
-
-	if err.Error() == "EOF" {
-		return nil
-	}
-	return err
 }
 
 func (s *DiskStorage) saveState() error {
@@ -103,15 +61,8 @@ func (s *DiskStorage) loadState() error {
 	return gob.NewDecoder(file).Decode(&s.LastSaves)
 }
 
-func (s *DiskStorage) Store(id CartId, grain *CartGrain) error {
-	lastSavedMessage, ok := s.LastSaves[id]
-	if ok && lastSavedMessage > grain.GetLastChange() {
-		return nil
-	}
-	err := saveMessages(grain.GetStorageMessage(lastSavedMessage), id)
-	if err != nil {
-		return err
-	}
+func (s *DiskStorage) Store(id CartId, _ *CartGrain) error {
+	// With the removal of the legacy message log, we only update the timestamp.
 	ts := time.Now().Unix()
 	s.LastSaves[id] = ts
 	s.lastSave = ts

frames.go

@@ -0,0 +1,102 @@
+package main
+
+// Minimal frame abstractions retained after removal of the legacy TCP/frame
+// networking layer. These types remain only to avoid a wide cascading refactor
+// across existing grain / pool logic that still constructs and passes
+// FrameWithPayload objects internally.
+//
+// The original responsibilities this replaces:
+//   - Binary framing, checksums, network IO
+//   - Distinction between request / reply frame types
+//
+// What remains:
+//   - A light weight container (FrameWithPayload) used as an in‑process
+//     envelope for status code + typed marker + payload bytes (JSON or proto).
+//   - Message / status constants referenced in existing code paths.
+//
+// Recommended future cleanup (post‑migration):
+//   - Remove FrameType entirely and replace with enumerated semantic results
+//     or error values.
+//   - Replace FrameWithPayload with a struct { Status int; Data []byte }.
+//   - Remove remote_* reply type branching once all callers rely on gRPC
+//     status + strongly typed responses.
+//
+// For now we keep this minimal surface to keep the gRPC migration focused.
+
+type (
+	// FrameType is a symbolic identifier carried through existing code paths.
+	// No ordering or bit semantics are required anymore.
+	FrameType  uint32
+	StatusCode uint32
+)
+
+type Frame struct {
+	Type       FrameType
+	StatusCode StatusCode
+	Length     uint32
+	// Checksum retained for compatibility; no longer validated.
+	Checksum uint32
+}
+
+// FrameWithPayload wraps a Frame with an opaque payload.
+// Payload usually contains JSON encoded cart state or an error message.
+type FrameWithPayload struct {
+	Frame
+	Payload []byte
+}
+
+// -----------------------------------------------------------------------------
+// Legacy Frame Type Constants (minimal subset still referenced)
+// -----------------------------------------------------------------------------
+const (
+	RemoteGetState            = FrameType(0x01)
+	RemoteHandleMutation      = FrameType(0x02)
+	ResponseBody              = FrameType(0x03) // (rarely used; kept for completeness)
+	RemoteGetStateReply       = FrameType(0x04)
+	RemoteHandleMutationReply = FrameType(0x05)
+	RemoteCreateOrderReply    = FrameType(0x06)
+)
+
+// MakeFrameWithPayload constructs an in‑process frame wrapper.
+// Length & Checksum are filled for backward compatibility (no validation logic
+// depends on the checksum anymore).
+func MakeFrameWithPayload(msg FrameType, statusCode StatusCode, payload []byte) FrameWithPayload {
+	length := uint32(len(payload))
+	return FrameWithPayload{
+		Frame: Frame{
+			Type:       msg,
+			StatusCode: statusCode,
+			Length:     length,
+			Checksum:   (uint32(msg) + uint32(statusCode) + length) / 8, // simple legacy formula
+		},
+		Payload: payload,
+	}
+}
+
+// Clone creates a shallow copy of the frame, duplicating the payload slice.
+func (f *FrameWithPayload) Clone() *FrameWithPayload {
+	if f == nil {
+		return nil
+	}
+	cp := make([]byte, len(f.Payload))
+	copy(cp, f.Payload)
+	return &FrameWithPayload{
+		Frame:   f.Frame,
+		Payload: cp,
+	}
+}
+
+// NewErrorFrame helper for creating an error frame with a textual payload.
+func NewErrorFrame(msg FrameType, code StatusCode, err error) FrameWithPayload {
+	var b []byte
+	if err != nil {
+		b = []byte(err.Error())
+	}
+	return MakeFrameWithPayload(msg, code, b)
+}
+
+// IsSuccess returns true if the status code indicates success in the
+// conventional HTTP style range (200–299). This mirrors previous usage patterns.
+func (f *FrameWithPayload) IsSuccess() bool {
+	return f != nil && f.StatusCode >= 200 && f.StatusCode < 300
+}

go.mod

@@ -1,63 +1,73 @@
 module git.tornberg.me/go-cart-actor
 
-go 1.24.2
+go 1.25.1
 
 require (
-	github.com/matst80/slask-finder v0.0.0-20250418094723-2eb7d6615761
-	github.com/prometheus/client_golang v1.22.0
+	github.com/google/uuid v1.6.0
+	github.com/matst80/slask-finder v0.0.0-20251009175145-ce05aff5a548
+	github.com/prometheus/client_golang v1.23.2
 	github.com/rabbitmq/amqp091-go v1.10.0
-	github.com/yudhasubki/netpool v0.0.0-20230717065341-3c1353ca328e
-	google.golang.org/protobuf v1.36.6
-	k8s.io/api v0.32.3
-	k8s.io/apimachinery v0.32.3
-	k8s.io/client-go v0.32.3
+	google.golang.org/grpc v1.76.0
+	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
 )
 
 require (
+	github.com/RoaringBitmap/roaring/v2 v2.10.0 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/bits-and-blooms/bitset v1.24.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
-	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
-	github.com/emicklei/go-restful/v3 v3.12.2 // indirect
-	github.com/fxamacker/cbor/v2 v2.8.0 // indirect
-	github.com/go-logr/logr v1.4.2 // indirect
-	github.com/go-openapi/jsonpointer v0.21.1 // indirect
-	github.com/go-openapi/jsonreference v0.21.0 // indirect
-	github.com/go-openapi/swag v0.23.1 // indirect
+	github.com/emicklei/go-restful/v3 v3.13.0 // indirect
+	github.com/fxamacker/cbor/v2 v2.9.0 // 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/gogo/protobuf v1.3.2 // indirect
-	github.com/golang/protobuf v1.5.4 // indirect
-	github.com/google/gnostic-models v0.6.9 // indirect
+	github.com/google/gnostic-models v0.7.0 // indirect
 	github.com/google/go-cmp v0.7.0 // indirect
-	github.com/google/gofuzz v1.2.0 // indirect
-	github.com/google/uuid v1.6.0 // indirect
-	github.com/josharian/intern v1.0.0 // indirect
+	github.com/gorilla/schema v1.4.1 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/mailru/easyjson v0.9.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect
+	github.com/mschoch/smat v0.2.0 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_model v0.6.2 // indirect
-	github.com/prometheus/common v0.63.0 // indirect
-	github.com/prometheus/procfs v0.16.0 // indirect
-	github.com/redis/go-redis/v9 v9.7.0 // indirect
+	github.com/prometheus/common v0.67.1 // indirect
+	github.com/prometheus/procfs v0.17.0 // indirect
 	github.com/spf13/pflag v1.0.6 // indirect
 	github.com/x448/float16 v0.8.4 // indirect
-	golang.org/x/net v0.39.0 // indirect
-	golang.org/x/oauth2 v0.29.0 // indirect
-	golang.org/x/sys v0.32.0 // indirect
-	golang.org/x/term v0.31.0 // indirect
-	golang.org/x/text v0.24.0 // indirect
-	golang.org/x/time v0.11.0 // indirect
-	golang.org/x/tools v0.32.0 // indirect
-	gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.3 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/net v0.46.0 // indirect
+	golang.org/x/oauth2 v0.32.0 // 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
+	golang.org/x/time v0.14.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20251007200510-49b9836ed3ff // indirect
+	gopkg.in/evanphx/json-patch.v4 v4.13.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/klog/v2 v2.130.1 // indirect
-	k8s.io/kube-openapi v0.0.0-20250318190949-c8a335a9a2ff // indirect
-	k8s.io/utils v0.0.0-20250321185631-1f6e0b77f77e // indirect
-	sigs.k8s.io/json v0.0.0-20241014173422-cfa47c3a1cc8 // indirect
+	k8s.io/kube-openapi v0.0.0-20250910181357-589584f1c912 // indirect
+	k8s.io/utils v0.0.0-20251002143259-bc988d571ff4 // indirect
+	sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 // indirect
 	sigs.k8s.io/randfill v1.0.0 // indirect
-	sigs.k8s.io/structured-merge-diff/v4 v4.7.0 // indirect
-	sigs.k8s.io/yaml v1.4.0 // indirect
+	sigs.k8s.io/structured-merge-diff/v6 v6.3.0 // indirect
+	sigs.k8s.io/yaml v1.6.0 // indirect
 )

go.sum

@@ -1,51 +1,71 @@
-github.com/Flaconi/go-klarna v0.0.0-20230216165926-e2f708c721d9 h1:U5gu3M9/khqtvgg6iRKo0+nxGEfPHWFHRlKrbZvFxIY=
-github.com/Flaconi/go-klarna v0.0.0-20230216165926-e2f708c721d9/go.mod h1:+LVFV9FXH5cwN1VcU30WcNYRs5FhkEtL7/IqqTD42cU=
+github.com/RoaringBitmap/roaring/v2 v2.10.0 h1:HbJ8Cs71lfCJyvmSptxeMX2PtvOC8yonlU0GQcy2Ak0=
+github.com/RoaringBitmap/roaring/v2 v2.10.0/go.mod h1:FiJcsfkGje/nZBZgCu0ZxCPOKD/hVXDS2dXi7/eUFE0=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
-github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
-github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
-github.com/bsm/gomega v1.27.10/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
+github.com/bits-and-blooms/bitset v1.12.0/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
+github.com/bits-and-blooms/bitset v1.24.0 h1:H4x4TuulnokZKvHLfzVRTHJfFfnHEeSYJizujEZvmAM=
+github.com/bits-and-blooms/bitset v1.24.0/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
-github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
-github.com/emicklei/go-restful/v3 v3.12.2 h1:DhwDP0vY3k8ZzE0RunuJy8GhNpPL6zqLkDf9B/a0/xU=
-github.com/emicklei/go-restful/v3 v3.12.2/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc=
-github.com/fxamacker/cbor/v2 v2.8.0 h1:fFtUGXUzXPHTIUdne5+zzMPTfffl3RD5qYnkY40vtxU=
-github.com/fxamacker/cbor/v2 v2.8.0/go.mod h1:vM4b+DJCtHn+zz7h3FFp/hDAI9WNWCsZj23V5ytsSxQ=
-github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
-github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
-github.com/go-openapi/jsonpointer v0.21.1 h1:whnzv/pNXtK2FbX/W9yJfRmE2gsmkfahjMKB0fZvcic=
-github.com/go-openapi/jsonpointer v0.21.1/go.mod h1:50I1STOfbY1ycR8jGz8DaMeLCdXiI6aDteEdRNNzpdk=
-github.com/go-openapi/jsonreference v0.21.0 h1:Rs+Y7hSXT83Jacb7kFyjn4ijOuVGSvOdF2+tg1TRrwQ=
-github.com/go-openapi/jsonreference v0.21.0/go.mod h1:LmZmgsrTkVg9LG4EaHeY8cBDslNPMo06cago5JNLkm4=
-github.com/go-openapi/swag v0.23.1 h1:lpsStH0n2ittzTnbaSloVZLuB5+fvSY/+hnagBjSNZU=
-github.com/go-openapi/swag v0.23.1/go.mod h1:STZs8TbRvEQQKUA+JZNAm3EWlgaOBGpyFDqQnDHMef0=
+github.com/emicklei/go-restful/v3 v3.13.0 h1:C4Bl2xDndpU6nJ4bc1jXd+uTmYPVUwkD6bFY/oTyCes=
+github.com/emicklei/go-restful/v3 v3.13.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc=
+github.com/fxamacker/cbor/v2 v2.9.0 h1:NpKPmjDBgUfBms6tr6JZkTHtfFGcMKsw3eGcmD/sapM=
+github.com/fxamacker/cbor/v2 v2.9.0/go.mod h1:vM4b+DJCtHn+zz7h3FFp/hDAI9WNWCsZj23V5ytsSxQ=
+github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
+github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
+github.com/go-openapi/jsonpointer v0.22.1 h1:sHYI1He3b9NqJ4wXLoJDKmUmHkWy/L7rtEo92JUxBNk=
+github.com/go-openapi/jsonpointer v0.22.1/go.mod h1:pQT9OsLkfz1yWoMgYFy4x3U5GY5nUlsOn1qSBH5MkCM=
+github.com/go-openapi/jsonreference v0.21.2 h1:Wxjda4M/BBQllegefXrY/9aq1fxBA8sI5M/lFU6tSWU=
+github.com/go-openapi/jsonreference v0.21.2/go.mod h1:pp3PEjIsJ9CZDGCNOyXIQxsNuroxm8FAJ/+quA0yKzQ=
+github.com/go-openapi/swag v0.25.1 h1:6uwVsx+/OuvFVPqfQmOOPsqTcm5/GkBhNwLqIR916n8=
+github.com/go-openapi/swag v0.25.1/go.mod h1:bzONdGlT0fkStgGPd3bhZf1MnuPkf2YAys6h+jZipOo=
+github.com/go-openapi/swag/cmdutils v0.25.1 h1:nDke3nAFDArAa631aitksFGj2omusks88GF1VwdYqPY=
+github.com/go-openapi/swag/cmdutils v0.25.1/go.mod h1:pdae/AFo6WxLl5L0rq87eRzVPm/XRHM3MoYgRMvG4A0=
+github.com/go-openapi/swag/conv v0.25.1 h1:+9o8YUg6QuqqBM5X6rYL/p1dpWeZRhoIt9x7CCP+he0=
+github.com/go-openapi/swag/conv v0.25.1/go.mod h1:Z1mFEGPfyIKPu0806khI3zF+/EUXde+fdeksUl2NiDs=
+github.com/go-openapi/swag/fileutils v0.25.1 h1:rSRXapjQequt7kqalKXdcpIegIShhTPXx7yw0kek2uU=
+github.com/go-openapi/swag/fileutils v0.25.1/go.mod h1:+NXtt5xNZZqmpIpjqcujqojGFek9/w55b3ecmOdtg8M=
+github.com/go-openapi/swag/jsonname v0.25.1 h1:Sgx+qbwa4ej6AomWC6pEfXrA6uP2RkaNjA9BR8a1RJU=
+github.com/go-openapi/swag/jsonname v0.25.1/go.mod h1:71Tekow6UOLBD3wS7XhdT98g5J5GR13NOTQ9/6Q11Zo=
+github.com/go-openapi/swag/jsonutils v0.25.1 h1:AihLHaD0brrkJoMqEZOBNzTLnk81Kg9cWr+SPtxtgl8=
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@@ -115,65 +148,72 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
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grain-pool.go

@@ -1,7 +1,6 @@
 package main
 
 import (
-	"encoding/json"
 	"fmt"
 	"log"
 	"sync"
@@ -27,8 +26,8 @@ var (
 )
 
 type GrainPool interface {
-	Process(id CartId, messages ...Message) (*FrameWithPayload, error)
-	Get(id CartId) (*FrameWithPayload, error)
+	Apply(id CartId, mutation interface{}) (*CartGrain, error)
+	Get(id CartId) (*CartGrain, error)
 }
 
 type Ttl struct {
@@ -143,26 +142,14 @@ func (p *GrainLocalPool) GetGrain(id CartId) (*CartGrain, error) {
 	return grain, err
 }
 
-func (p *GrainLocalPool) Process(id CartId, messages ...Message) (*FrameWithPayload, error) {
+func (p *GrainLocalPool) Apply(id CartId, mutation interface{}) (*CartGrain, error) {
 	grain, err := p.GetGrain(id)
-	var result *FrameWithPayload
-	if err == nil && grain != nil {
-		for _, message := range messages {
-			result, err = grain.HandleMessage(&message, false)
+	if err != nil || grain == nil {
+		return nil, err
 	}
-	}
-	return result, err
+	return grain.Apply(mutation, false)
 }
 
-func (p *GrainLocalPool) Get(id CartId) (*FrameWithPayload, error) {
-	grain, err := p.GetGrain(id)
-	if err != nil {
-		return nil, err
-	}
-	data, err := json.Marshal(grain)
-	if err != nil {
-		return nil, err
-	}
-	ret := MakeFrameWithPayload(0, 200, data)
-	return &ret, nil
+func (p *GrainLocalPool) Get(id CartId) (*CartGrain, error) {
+	return p.GetGrain(id)
 }

grpc_integration_test.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"testing"
+	"time"
+
+	messages "git.tornberg.me/go-cart-actor/proto"
+	"google.golang.org/grpc"
+)
+
+// TestCartActorMutationAndState validates end-to-end gRPC mutation + state retrieval
+// against a locally started gRPC server (single-node scenario).
+// This test uses the new per-mutation AddItem RPC (breaking v2 API) to avoid external product fetch logic
+// fetching logic (FetchItem) which would require network I/O.
+func TestCartActorMutationAndState(t *testing.T) {
+	// Setup local grain pool + synced pool (no discovery, single host)
+	pool := NewGrainLocalPool(1024, time.Minute, spawn)
+	synced, err := NewSyncedPool(pool, "127.0.0.1", nil)
+	if err != nil {
+		t.Fatalf("NewSyncedPool error: %v", err)
+	}
+
+	// Start gRPC server (CartActor + ControlPlane) on :1337
+	grpcSrv, err := StartGRPCServer(":1337", pool, synced)
+	if err != nil {
+		t.Fatalf("StartGRPCServer error: %v", err)
+	}
+	defer grpcSrv.GracefulStop()
+
+	// Dial the local server
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+	conn, err := grpc.DialContext(ctx, "127.0.0.1:1337",
+		grpc.WithInsecure(),
+		grpc.WithBlock(),
+	)
+	if err != nil {
+		t.Fatalf("grpc.Dial error: %v", err)
+	}
+	defer conn.Close()
+
+	cartClient := messages.NewCartActorClient(conn)
+
+	// Create a short cart id (<=16 chars so it fits into the fixed CartId 16-byte array cleanly)
+	cartID := fmt.Sprintf("cart-%d", time.Now().UnixNano())
+
+	// Build an AddItem payload (bypasses FetchItem to keep test deterministic)
+	addItem := &messages.AddItem{
+		ItemId:   1,
+		Quantity: 1,
+		Price:    1000,
+		OrgPrice: 1000,
+		Sku:      "test-sku",
+		Name:     "Test SKU",
+		Image:    "/img.png",
+		Stock:    2, // InStock
+		Tax:      2500,
+		Country:  "se",
+	}
+
+	// Issue AddItem RPC directly (breaking v2 API)
+	addResp, err := cartClient.AddItem(context.Background(), &messages.AddItemRequest{
+		CartId:          cartID,
+		ClientTimestamp: time.Now().Unix(),
+		Payload:         addItem,
+	})
+	if err != nil {
+		t.Fatalf("AddItem RPC error: %v", err)
+	}
+	if addResp.StatusCode != 200 {
+		t.Fatalf("AddItem returned non-200 status: %d, error: %s", addResp.StatusCode, addResp.GetError())
+	}
+
+	// Validate the response state (from AddItem)
+	state := addResp.GetState()
+	if state == nil {
+		t.Fatalf("AddItem response state is nil")
+	}
+
+	// (Removed obsolete Mutate response handling)
+
+	if len(state.Items) != 1 {
+		t.Fatalf("Expected 1 item after AddItem, got %d", len(state.Items))
+	}
+	if state.Items[0].Sku != "test-sku" {
+		t.Fatalf("Unexpected item SKU: %s", state.Items[0].Sku)
+	}
+
+	// Issue GetState RPC
+	getResp, err := cartClient.GetState(context.Background(), &messages.StateRequest{
+		CartId: cartID,
+	})
+	if err != nil {
+		t.Fatalf("GetState RPC error: %v", err)
+	}
+	if getResp.StatusCode != 200 {
+		t.Fatalf("GetState returned non-200 status: %d, error: %s", getResp.StatusCode, getResp.GetError())
+	}
+
+	state2 := getResp.GetState()
+	if state2 == nil {
+		t.Fatalf("GetState response state is nil")
+	}
+
+	if len(state2.Items) != 1 {
+		t.Fatalf("Expected 1 item in GetState, got %d", len(state2.Items))
+	}
+	if state2.Items[0].Sku != "test-sku" {
+		t.Fatalf("Unexpected SKU in GetState: %s", state2.Items[0].Sku)
+	}
+}
+
+// Legacy serialization helper removed (oneof envelope used directly)

grpc_server.go

@@ -0,0 +1,203 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net"
+	"time"
+
+	messages "git.tornberg.me/go-cart-actor/proto"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/reflection"
+)
+
+// cartActorGRPCServer implements the CartActor and ControlPlane gRPC services.
+// It delegates cart operations to a grain pool and cluster operations to a synced pool.
+type cartActorGRPCServer struct {
+	messages.UnimplementedCartActorServer
+	messages.UnimplementedControlPlaneServer
+
+	pool       GrainPool   // For cart state mutations and queries
+	syncedPool *SyncedPool // For cluster membership and control
+}
+
+// NewCartActorGRPCServer creates and initializes the server.
+func NewCartActorGRPCServer(pool GrainPool, syncedPool *SyncedPool) *cartActorGRPCServer {
+	return &cartActorGRPCServer{
+		pool:       pool,
+		syncedPool: syncedPool,
+	}
+}
+
+// applyMutation routes a single cart mutation to the target grain (used by per-mutation RPC handlers).
+func (s *cartActorGRPCServer) applyMutation(cartID string, mutation interface{}) *messages.CartMutationReply {
+	grain, err := s.pool.Apply(ToCartId(cartID), mutation)
+	if err != nil {
+		return &messages.CartMutationReply{
+			StatusCode:      500,
+			Result:          &messages.CartMutationReply_Error{Error: err.Error()},
+			ServerTimestamp: time.Now().Unix(),
+		}
+	}
+	cartState := ToCartState(grain)
+	return &messages.CartMutationReply{
+		StatusCode:      200,
+		Result:          &messages.CartMutationReply_State{State: cartState},
+		ServerTimestamp: time.Now().Unix(),
+	}
+}
+
+func (s *cartActorGRPCServer) AddRequest(ctx context.Context, req *messages.AddRequestRequest) (*messages.CartMutationReply, error) {
+	if req.GetCartId() == "" {
+		return &messages.CartMutationReply{
+			StatusCode:      400,
+			Result:          &messages.CartMutationReply_Error{Error: "cart_id is required"},
+			ServerTimestamp: time.Now().Unix(),
+		}, nil
+	}
+	return s.applyMutation(req.GetCartId(), req.GetPayload()), nil
+}
+
+func (s *cartActorGRPCServer) AddItem(ctx context.Context, req *messages.AddItemRequest) (*messages.CartMutationReply, error) {
+	if req.GetCartId() == "" {
+		return &messages.CartMutationReply{
+			StatusCode:      400,
+			Result:          &messages.CartMutationReply_Error{Error: "cart_id is required"},
+			ServerTimestamp: time.Now().Unix(),
+		}, nil
+	}
+	return s.applyMutation(req.GetCartId(), req.GetPayload()), nil
+}
+
+func (s *cartActorGRPCServer) RemoveItem(ctx context.Context, req *messages.RemoveItemRequest) (*messages.CartMutationReply, error) {
+	if req.GetCartId() == "" {
+		return &messages.CartMutationReply{
+			StatusCode:      400,
+			Result:          &messages.CartMutationReply_Error{Error: "cart_id is required"},
+			ServerTimestamp: time.Now().Unix(),
+		}, nil
+	}
+	return s.applyMutation(req.GetCartId(), req.GetPayload()), nil
+}
+
+func (s *cartActorGRPCServer) RemoveDelivery(ctx context.Context, req *messages.RemoveDeliveryRequest) (*messages.CartMutationReply, error) {
+	if req.GetCartId() == "" {
+		return &messages.CartMutationReply{
+			StatusCode:      400,
+			Result:          &messages.CartMutationReply_Error{Error: "cart_id is required"},
+			ServerTimestamp: time.Now().Unix(),
+		}, nil
+	}
+	return s.applyMutation(req.GetCartId(), req.GetPayload()), nil
+}
+
+func (s *cartActorGRPCServer) ChangeQuantity(ctx context.Context, req *messages.ChangeQuantityRequest) (*messages.CartMutationReply, error) {
+	if req.GetCartId() == "" {
+		return &messages.CartMutationReply{
+			StatusCode:      400,
+			Result:          &messages.CartMutationReply_Error{Error: "cart_id is required"},
+			ServerTimestamp: time.Now().Unix(),
+		}, nil
+	}
+	return s.applyMutation(req.GetCartId(), req.GetPayload()), nil
+}
+
+func (s *cartActorGRPCServer) SetDelivery(ctx context.Context, req *messages.SetDeliveryRequest) (*messages.CartMutationReply, error) {
+	if req.GetCartId() == "" {
+		return &messages.CartMutationReply{
+			StatusCode:      400,
+			Result:          &messages.CartMutationReply_Error{Error: "cart_id is required"},
+			ServerTimestamp: time.Now().Unix(),
+		}, nil
+	}
+	return s.applyMutation(req.GetCartId(), req.GetPayload()), nil
+}
+
+func (s *cartActorGRPCServer) SetPickupPoint(ctx context.Context, req *messages.SetPickupPointRequest) (*messages.CartMutationReply, error) {
+	if req.GetCartId() == "" {
+		return &messages.CartMutationReply{
+			StatusCode:      400,
+			Result:          &messages.CartMutationReply_Error{Error: "cart_id is required"},
+			ServerTimestamp: time.Now().Unix(),
+		}, nil
+	}
+	return s.applyMutation(req.GetCartId(), req.GetPayload()), nil
+}
+
+/*
+Checkout RPC removed. Checkout is handled at the HTTP layer (PoolServer.HandleCheckout).
+*/
+
+func (s *cartActorGRPCServer) SetCartItems(ctx context.Context, req *messages.SetCartItemsRequest) (*messages.CartMutationReply, error) {
+	if req.GetCartId() == "" {
+		return &messages.CartMutationReply{
+			StatusCode:      400,
+			Result:          &messages.CartMutationReply_Error{Error: "cart_id is required"},
+			ServerTimestamp: time.Now().Unix(),
+		}, nil
+	}
+	return s.applyMutation(req.GetCartId(), req.GetPayload()), nil
+}
+
+func (s *cartActorGRPCServer) OrderCompleted(ctx context.Context, req *messages.OrderCompletedRequest) (*messages.CartMutationReply, error) {
+	if req.GetCartId() == "" {
+		return &messages.CartMutationReply{
+			StatusCode:      400,
+			Result:          &messages.CartMutationReply_Error{Error: "cart_id is required"},
+			ServerTimestamp: time.Now().Unix(),
+		}, nil
+	}
+	return s.applyMutation(req.GetCartId(), req.GetPayload()), nil
+}
+
+// GetState retrieves the current state of a cart grain.
+func (s *cartActorGRPCServer) GetState(ctx context.Context, req *messages.StateRequest) (*messages.StateReply, error) {
+	if req.GetCartId() == "" {
+		return &messages.StateReply{
+			StatusCode: 400,
+			Result:     &messages.StateReply_Error{Error: "cart_id is required"},
+		}, nil
+	}
+	cartID := ToCartId(req.GetCartId())
+
+	grain, err := s.pool.Get(cartID)
+	if err != nil {
+		return &messages.StateReply{
+			StatusCode: 500,
+			Result:     &messages.StateReply_Error{Error: err.Error()},
+		}, nil
+	}
+
+	cartState := ToCartState(grain)
+
+	return &messages.StateReply{
+		StatusCode: 200,
+		Result:     &messages.StateReply_State{State: cartState},
+	}, nil
+}
+
+// StartGRPCServer configures and starts the unified gRPC server on the given address.
+// It registers both the CartActor and ControlPlane services.
+func StartGRPCServer(addr string, pool GrainPool, syncedPool *SyncedPool) (*grpc.Server, error) {
+	lis, err := net.Listen("tcp", addr)
+	if err != nil {
+		return nil, fmt.Errorf("failed to listen: %w", err)
+	}
+
+	grpcServer := grpc.NewServer()
+	server := NewCartActorGRPCServer(pool, syncedPool)
+
+	messages.RegisterCartActorServer(grpcServer, server)
+	messages.RegisterControlPlaneServer(grpcServer, server)
+	reflection.Register(grpcServer)
+
+	log.Printf("gRPC server listening on %s", addr)
+	go func() {
+		if err := grpcServer.Serve(lis); err != nil {
+			log.Fatalf("failed to serve gRPC: %v", err)
+		}
+	}()
+
+	return grpcServer, nil
+}

id_test.go

@@ -1,19 +0,0 @@
-package main
-
-import (
-	"testing"
-)
-
-func TestIdGeneration(t *testing.T) {
-	// Generate a random ID
-	id := NewCartId()
-
-	// Generate a random ID
-	id2 := NewCartId()
-	// Compare the two IDs
-	if id == id2 {
-		t.Errorf("IDs are the same: %v == %v", id, id2)
-	} else {
-		t.Log("ID generation test passed", id, id2)
-	}
-}

main.go

@@ -43,7 +43,7 @@ func spawn(id CartId) (*CartGrain, error) {
 		Deliveries:     []*CartDelivery{},
 		Id:             id,
 		Items:          []*CartItem{},
-		storageMessages: []Message{},
+		// storageMessages removed (legacy event log deprecated)
 		TotalPrice: 0,
 	}
 	err := loadMessages(ret, id)
@@ -97,23 +97,6 @@ var name = os.Getenv("POD_NAME")
 var amqpUrl = os.Getenv("AMQP_URL")
 var KlarnaInstance = NewKlarnaClient(KlarnaPlaygroundUrl, os.Getenv("KLARNA_API_USERNAME"), os.Getenv("KLARNA_API_PASSWORD"))
 
-func GetDiscovery() 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 NewK8sDiscovery(client)
-}
-
 var tpl = `<!DOCTYPE html>
 <html lang="en">
   <head>
@@ -153,6 +136,23 @@ func getCheckoutOrder(host string, cartId CartId) *messages.CreateCheckoutOrder
 	}
 }
 
+func GetDiscovery() 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 NewK8sDiscovery(client)
+}
+
 func main() {
 
 	storage, err := NewDiskStorage(fmt.Sprintf("data/%s_state.gob", name))
@@ -169,10 +169,13 @@ func main() {
 		log.Fatalf("Error creating synced pool: %v\n", err)
 	}
 
-	hg, err := NewGrainHandler(app.pool, ":1337")
+	// Start unified gRPC server (CartActor + ControlPlane) replacing legacy RPC server on :1337
+	// TODO: Remove any remaining legacy RPC server references and deprecated frame-based code after full gRPC migration is validated.
+	grpcSrv, err := StartGRPCServer(":1337", app.pool, syncedPool)
 	if err != nil {
-		log.Fatalf("Error creating handler: %v\n", err)
+		log.Fatalf("Error starting gRPC server: %v\n", err)
 	}
+	defer grpcSrv.GracefulStop()
 
 	go func() {
 		for range time.Tick(time.Minute * 10) {
@@ -202,17 +205,21 @@ func main() {
 	mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
 	mux.Handle("/metrics", promhttp.Handler())
 	mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
-		if !hg.IsHealthy() {
+		// Grain pool health: simple capacity check (mirrors previous GrainHandler.IsHealthy)
+		app.pool.mu.RLock()
+		grainCount := len(app.pool.grains)
+		capacity := app.pool.PoolSize
+		app.pool.mu.RUnlock()
+		if grainCount >= capacity {
 			w.WriteHeader(http.StatusInternalServerError)
-			w.Write([]byte("handler not healthy"))
+			w.Write([]byte("grain pool at capacity"))
 			return
 		}
 		if !syncedPool.IsHealthy() {
 			w.WriteHeader(http.StatusInternalServerError)
-			w.Write([]byte("pool not healthy"))
+			w.Write([]byte("control plane not healthy"))
 			return
 		}
-
 		w.WriteHeader(http.StatusOK)
 		w.Write([]byte("ok"))
 	})
@@ -242,20 +249,12 @@ func main() {
 				return
 			}
 			cartId := ToCartId(cookie.Value)
-			reply, err := syncedServer.pool.Process(cartId, Message{
-				Type:    CreateCheckoutOrderType,
-				Content: getCheckoutOrder(r.Host, cartId),
-			})
+			_, err = syncedServer.pool.Apply(cartId, getCheckoutOrder(r.Host, cartId))
 			if err != nil {
 				w.WriteHeader(http.StatusInternalServerError)
 				w.Write([]byte(err.Error()))
 			}
-			err = json.Unmarshal(reply.Payload, &order)
-			if err != nil {
-				w.WriteHeader(http.StatusInternalServerError)
-				w.Write([]byte(err.Error()))
-				return
-			}
+			// v2: Apply now returns *CartGrain; order creation handled inside grain (no payload to unmarshal)
 		} else {
 			prevOrder, err := KlarnaInstance.GetOrder(orderId)
 			if err != nil {
@@ -378,18 +377,16 @@ func main() {
 		done <- true
 	}()
 
-	go http.ListenAndServe(":8080", mux)
+	log.Print("Server started at port 8083")
+	go http.ListenAndServe(":8083", mux)
 	<-done
 
 }
 
 func triggerOrderCompleted(err error, syncedServer *PoolServer, order *CheckoutOrder) error {
-	_, err = syncedServer.pool.Process(ToCartId(order.MerchantReference1), Message{
-		Type: OrderCompletedType,
-		Content: &messages.OrderCreated{
+	_, err = syncedServer.pool.Apply(ToCartId(order.MerchantReference1), &messages.OrderCreated{
 		OrderId: order.ID,
 		Status:  order.Status,
-		},
 	})
 	return err
 }

main_test.go

@@ -1,286 +0,0 @@
-package main
-
-import (
-	"os"
-	"testing"
-)
-
-func TestGetCountryFromHost(t *testing.T) {
-	tests := []struct {
-		name     string
-		host     string
-		expected string
-	}{
-		{
-			name:     "Norwegian host",
-			host:     "s10n-no.tornberg.me",
-			expected: "no",
-		},
-		{
-			name:     "Swedish host",
-			host:     "s10n-se.tornberg.me",
-			expected: "se",
-		},
-		{
-			name:     "Host with -no in the middle",
-			host:     "api-no-staging.tornberg.me",
-			expected: "no",
-		},
-		{
-			name:     "Host without country suffix",
-			host:     "s10n.tornberg.me",
-			expected: "se",
-		},
-		{
-			name:     "Host with different domain",
-			host:     "example-no.com",
-			expected: "no",
-		},
-		{
-			name:     "Empty host",
-			host:     "",
-			expected: "se",
-		},
-		{
-			name:     "Host with uppercase",
-			host:     "S10N-NO.TORNBERG.ME",
-			expected: "no",
-		},
-		{
-			name:     "Host with mixed case",
-			host:     "S10n-No.Tornberg.Me",
-			expected: "no",
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			result := getCountryFromHost(tt.host)
-			if result != tt.expected {
-				t.Errorf("getCountryFromHost(%q) = %q, want %q", tt.host, result, tt.expected)
-			}
-		})
-	}
-}
-
-func TestGetCheckoutOrder(t *testing.T) {
-	// Save original environment variable and restore after test
-	originalCartBaseUrl := os.Getenv("CART_BASE_URL")
-	defer func() {
-		if originalCartBaseUrl == "" {
-			os.Unsetenv("CART_BASE_URL")
-		} else {
-			os.Setenv("CART_BASE_URL", originalCartBaseUrl)
-		}
-	}()
-
-	tests := []struct {
-		name         string
-		host         string
-		cartId       CartId
-		cartBaseUrl  string
-		expectedUrls struct {
-			terms        string
-			checkout     string
-			confirmation string
-			validation   string
-			push         string
-			country      string
-		}
-	}{
-		{
-			name:        "Norwegian host with default cart base URL",
-			host:        "s10n-no.tornberg.me",
-			cartId:      ToCartId("test-cart-123"),
-			cartBaseUrl: "", // Use default
-			expectedUrls: struct {
-				terms        string
-				checkout     string
-				confirmation string
-				validation   string
-				push         string
-				country      string
-			}{
-				terms:        "https://s10n-no.tornberg.me/terms",
-				checkout:     "https://s10n-no.tornberg.me/checkout?order_id={checkout.order.id}",
-				confirmation: "https://s10n-no.tornberg.me/confirmation/{checkout.order.id}",
-				validation:   "https://cart.tornberg.me/validation",
-				push:         "https://cart.tornberg.me/push?order_id={checkout.order.id}",
-				country:      "no",
-			},
-		},
-		{
-			name:        "Swedish host with default cart base URL",
-			host:        "s10n-se.tornberg.me",
-			cartId:      ToCartId("test-cart-456"),
-			cartBaseUrl: "", // Use default
-			expectedUrls: struct {
-				terms        string
-				checkout     string
-				confirmation string
-				validation   string
-				push         string
-				country      string
-			}{
-				terms:        "https://s10n-se.tornberg.me/terms",
-				checkout:     "https://s10n-se.tornberg.me/checkout?order_id={checkout.order.id}",
-				confirmation: "https://s10n-se.tornberg.me/confirmation/{checkout.order.id}",
-				validation:   "https://cart.tornberg.me/validation",
-				push:         "https://cart.tornberg.me/push?order_id={checkout.order.id}",
-				country:      "se",
-			},
-		},
-		{
-			name:        "Norwegian host with custom cart base URL",
-			host:        "s10n-no.tornberg.me",
-			cartId:      ToCartId("test-cart-789"),
-			cartBaseUrl: "https://custom-cart.example.com",
-			expectedUrls: struct {
-				terms        string
-				checkout     string
-				confirmation string
-				validation   string
-				push         string
-				country      string
-			}{
-				terms:        "https://s10n-no.tornberg.me/terms",
-				checkout:     "https://s10n-no.tornberg.me/checkout?order_id={checkout.order.id}",
-				confirmation: "https://s10n-no.tornberg.me/confirmation/{checkout.order.id}",
-				validation:   "https://custom-cart.example.com/validation",
-				push:         "https://custom-cart.example.com/push?order_id={checkout.order.id}",
-				country:      "no",
-			},
-		},
-		{
-			name:        "Host without country code defaults to Swedish",
-			host:        "s10n.tornberg.me",
-			cartId:      ToCartId("test-cart-default"),
-			cartBaseUrl: "",
-			expectedUrls: struct {
-				terms        string
-				checkout     string
-				confirmation string
-				validation   string
-				push         string
-				country      string
-			}{
-				terms:        "https://s10n.tornberg.me/terms",
-				checkout:     "https://s10n.tornberg.me/checkout?order_id={checkout.order.id}",
-				confirmation: "https://s10n.tornberg.me/confirmation/{checkout.order.id}",
-				validation:   "https://cart.tornberg.me/validation",
-				push:         "https://cart.tornberg.me/push?order_id={checkout.order.id}",
-				country:      "se",
-			},
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			// Set up environment variable for this test
-			if tt.cartBaseUrl == "" {
-				os.Unsetenv("CART_BASE_URL")
-			} else {
-				os.Setenv("CART_BASE_URL", tt.cartBaseUrl)
-			}
-
-			result := getCheckoutOrder(tt.host, tt.cartId)
-
-			// Verify the result is not nil
-			if result == nil {
-				t.Fatal("getCheckoutOrder returned nil")
-			}
-
-			// Check each URL field
-			if result.Terms != tt.expectedUrls.terms {
-				t.Errorf("Terms URL: got %q, want %q", result.Terms, tt.expectedUrls.terms)
-			}
-
-			if result.Checkout != tt.expectedUrls.checkout {
-				t.Errorf("Checkout URL: got %q, want %q", result.Checkout, tt.expectedUrls.checkout)
-			}
-
-			if result.Confirmation != tt.expectedUrls.confirmation {
-				t.Errorf("Confirmation URL: got %q, want %q", result.Confirmation, tt.expectedUrls.confirmation)
-			}
-
-			if result.Validation != tt.expectedUrls.validation {
-				t.Errorf("Validation URL: got %q, want %q", result.Validation, tt.expectedUrls.validation)
-			}
-
-			if result.Push != tt.expectedUrls.push {
-				t.Errorf("Push URL: got %q, want %q", result.Push, tt.expectedUrls.push)
-			}
-
-			if result.Country != tt.expectedUrls.country {
-				t.Errorf("Country: got %q, want %q", result.Country, tt.expectedUrls.country)
-			}
-		})
-	}
-}
-
-func TestGetCheckoutOrderIntegration(t *testing.T) {
-	// Test that both functions work together correctly
-	hosts := []string{"s10n-no.tornberg.me", "s10n-se.tornberg.me"}
-	cartId := ToCartId("integration-test-cart")
-
-	for _, host := range hosts {
-		t.Run(host, func(t *testing.T) {
-			// Get country from host
-			country := getCountryFromHost(host)
-
-			// Get checkout order
-			order := getCheckoutOrder(host, cartId)
-
-			// Verify that the country in the order matches what getCountryFromHost returns
-			if order.Country != country {
-				t.Errorf("Country mismatch: getCountryFromHost(%q) = %q, but order.Country = %q",
-					host, country, order.Country)
-			}
-
-			// Verify that all URLs contain the correct host
-			expectedBaseUrl := "https://" + host
-
-			if !containsPrefix(order.Terms, expectedBaseUrl) {
-				t.Errorf("Terms URL should start with %q, got %q", expectedBaseUrl, order.Terms)
-			}
-
-			if !containsPrefix(order.Checkout, expectedBaseUrl) {
-				t.Errorf("Checkout URL should start with %q, got %q", expectedBaseUrl, order.Checkout)
-			}
-
-			if !containsPrefix(order.Confirmation, expectedBaseUrl) {
-				t.Errorf("Confirmation URL should start with %q, got %q", expectedBaseUrl, order.Confirmation)
-			}
-		})
-	}
-}
-
-// Helper function to check if a string starts with a prefix
-func containsPrefix(s, prefix string) bool {
-	return len(s) >= len(prefix) && s[:len(prefix)] == prefix
-}
-
-// Benchmark tests to measure performance
-func BenchmarkGetCountryFromHost(b *testing.B) {
-	hosts := []string{
-		"s10n-no.tornberg.me",
-		"s10n-se.tornberg.me",
-		"api-no-staging.tornberg.me",
-		"s10n.tornberg.me",
-	}
-
-	for i := 0; i < b.N; i++ {
-		for _, host := range hosts {
-			getCountryFromHost(host)
-		}
-	}
-}
-
-func BenchmarkGetCheckoutOrder(b *testing.B) {
-	host := "s10n-no.tornberg.me"
-	cartId := ToCartId("benchmark-cart")
-
-	for i := 0; i < b.N; i++ {
-		getCheckoutOrder(host, cartId)
-	}
-}

message-handler.go

@@ -1,315 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"io"
-
-	messages "git.tornberg.me/go-cart-actor/proto"
-	"google.golang.org/protobuf/proto"
-)
-
-var Handlers = map[uint16]MessageHandler{
-	AddRequestType:          &AddRequestHandler{},
-	AddItemType:             &AddItemHandler{},
-	ChangeQuantityType:      &ChangeQuantityHandler{},
-	SetDeliveryType:         &SetDeliveryHandler{},
-	RemoveItemType:          &RemoveItemHandler{},
-	RemoveDeliveryType:      &RemoveDeliveryHandler{},
-	CreateCheckoutOrderType: &CheckoutHandler{},
-	SetCartItemsType:        &SetCartItemsHandler{},
-	OrderCompletedType:      &OrderCompletedHandler{},
-}
-
-func GetMessageHandler(t uint16) (MessageHandler, error) {
-	h, ok := Handlers[t]
-	if !ok {
-		return nil, fmt.Errorf("no handler for message type %d", t)
-	}
-	return h, nil
-}
-
-type MessageHandler interface {
-	Write(*Message, io.Writer) error
-	Read(data []byte) (interface{}, error)
-	Is(*Message) bool
-}
-type TypedMessageHandler struct {
-	Type uint16
-}
-
-type SetCartItemsHandler struct {
-	TypedMessageHandler
-}
-
-func (h *SetCartItemsHandler) Write(m *Message, w io.Writer) error {
-	messageBytes, err := proto.Marshal(m.Content.(*messages.SetCartRequest))
-	if err != nil {
-		return err
-	}
-	w.Write(messageBytes)
-	return nil
-}
-
-func (h *SetCartItemsHandler) Read(data []byte) (interface{}, error) {
-	msg := &messages.SetCartRequest{}
-
-	err := proto.Unmarshal(data, msg)
-	if err != nil {
-		return nil, err
-	}
-	return msg, nil
-}
-
-func (h *SetCartItemsHandler) Is(m *Message) bool {
-	if m.Type != AddRequestType {
-		return false
-	}
-	_, ok := m.Content.(*messages.SetCartRequest)
-	return ok
-}
-
-type AddRequestHandler struct {
-	TypedMessageHandler
-}
-
-func (h *AddRequestHandler) Write(m *Message, w io.Writer) error {
-	messageBytes, err := proto.Marshal(m.Content.(*messages.AddRequest))
-	if err != nil {
-		return err
-	}
-	w.Write(messageBytes)
-	return nil
-}
-
-func (h *AddRequestHandler) Read(data []byte) (interface{}, error) {
-	msg := &messages.AddRequest{}
-
-	err := proto.Unmarshal(data, msg)
-	if err != nil {
-		return nil, err
-	}
-	return msg, nil
-}
-
-func (h *AddRequestHandler) Is(m *Message) bool {
-	if m.Type != AddRequestType {
-		return false
-	}
-	_, ok := m.Content.(*messages.AddRequest)
-	return ok
-}
-
-type AddItemHandler struct {
-	TypedMessageHandler
-}
-
-func (h *AddItemHandler) Write(m *Message, w io.Writer) error {
-	messageBytes, err := proto.Marshal(m.Content.(*messages.AddItem))
-	if err != nil {
-		return err
-	}
-	w.Write(messageBytes)
-	return nil
-}
-
-func (h *AddItemHandler) Read(data []byte) (interface{}, error) {
-	msg := &messages.AddItem{}
-
-	err := proto.Unmarshal(data, msg)
-	if err != nil {
-		return nil, err
-	}
-	return msg, nil
-}
-
-func (h *AddItemHandler) Is(m *Message) bool {
-	if m.Type != AddItemType {
-		return false
-	}
-	_, ok := m.Content.(*messages.AddItem)
-	return ok
-}
-
-type ChangeQuantityHandler struct {
-	TypedMessageHandler
-}
-
-func (h *ChangeQuantityHandler) Write(m *Message, w io.Writer) error {
-	messageBytes, err := proto.Marshal(m.Content.(*messages.ChangeQuantity))
-	if err != nil {
-		return err
-	}
-	w.Write(messageBytes)
-	return nil
-}
-
-func (h *ChangeQuantityHandler) Read(data []byte) (interface{}, error) {
-	msg := &messages.ChangeQuantity{}
-
-	err := proto.Unmarshal(data, msg)
-	if err != nil {
-		return nil, err
-	}
-	return msg, nil
-}
-
-func (h *ChangeQuantityHandler) Is(m *Message) bool {
-	if m.Type != ChangeQuantityType {
-		return false
-	}
-	_, ok := m.Content.(*messages.ChangeQuantity)
-	return ok
-}
-
-type SetDeliveryHandler struct {
-	TypedMessageHandler
-}
-
-func (h *SetDeliveryHandler) Write(m *Message, w io.Writer) error {
-	messageBytes, err := proto.Marshal(m.Content.(*messages.SetDelivery))
-	if err != nil {
-		return err
-	}
-	w.Write(messageBytes)
-	return nil
-}
-
-func (h *SetDeliveryHandler) Read(data []byte) (interface{}, error) {
-	msg := &messages.SetDelivery{}
-
-	err := proto.Unmarshal(data, msg)
-	if err != nil {
-		return nil, err
-	}
-	return msg, nil
-}
-
-func (h *SetDeliveryHandler) Is(m *Message) bool {
-	if m.Type != ChangeQuantityType {
-		return false
-	}
-	_, ok := m.Content.(*messages.SetDelivery)
-	return ok
-}
-
-type RemoveItemHandler struct {
-	TypedMessageHandler
-}
-
-func (h *RemoveItemHandler) Write(m *Message, w io.Writer) error {
-	messageBytes, err := proto.Marshal(m.Content.(*messages.RemoveItem))
-	if err != nil {
-		return err
-	}
-	w.Write(messageBytes)
-	return nil
-}
-
-func (h *RemoveItemHandler) Read(data []byte) (interface{}, error) {
-	msg := &messages.RemoveItem{}
-
-	err := proto.Unmarshal(data, msg)
-	if err != nil {
-		return nil, err
-	}
-	return msg, nil
-}
-
-func (h *RemoveItemHandler) Is(m *Message) bool {
-	if m.Type != AddItemType {
-		return false
-	}
-	_, ok := m.Content.(*messages.RemoveItem)
-	return ok
-}
-
-type RemoveDeliveryHandler struct {
-	TypedMessageHandler
-}
-
-func (h *RemoveDeliveryHandler) Write(m *Message, w io.Writer) error {
-	messageBytes, err := proto.Marshal(m.Content.(*messages.RemoveDelivery))
-	if err != nil {
-		return err
-	}
-	w.Write(messageBytes)
-	return nil
-}
-
-func (h *RemoveDeliveryHandler) Read(data []byte) (interface{}, error) {
-	msg := &messages.RemoveDelivery{}
-
-	err := proto.Unmarshal(data, msg)
-	if err != nil {
-		return nil, err
-	}
-	return msg, nil
-}
-
-func (h *RemoveDeliveryHandler) Is(m *Message) bool {
-	if m.Type != AddItemType {
-		return false
-	}
-	_, ok := m.Content.(*messages.RemoveDelivery)
-	return ok
-}
-
-type CheckoutHandler struct {
-	TypedMessageHandler
-}
-
-func (h *CheckoutHandler) Write(m *Message, w io.Writer) error {
-	messageBytes, err := proto.Marshal(m.Content.(*messages.CreateCheckoutOrder))
-	if err != nil {
-		return err
-	}
-	w.Write(messageBytes)
-	return nil
-}
-
-func (h *CheckoutHandler) Read(data []byte) (interface{}, error) {
-	msg := &messages.CreateCheckoutOrder{}
-
-	err := proto.Unmarshal(data, msg)
-	if err != nil {
-		return nil, err
-	}
-	return msg, nil
-}
-
-func (h *CheckoutHandler) Is(m *Message) bool {
-	if m.Type != CreateCheckoutOrderType {
-		return false
-	}
-	_, ok := m.Content.(*messages.CreateCheckoutOrder)
-	return ok
-}
-
-type OrderCompletedHandler struct {
-	TypedMessageHandler
-}
-
-func (h *OrderCompletedHandler) Write(m *Message, w io.Writer) error {
-	messageBytes, err := proto.Marshal(m.Content.(*messages.OrderCreated))
-	if err != nil {
-		return err
-	}
-	w.Write(messageBytes)
-	return nil
-}
-func (h *OrderCompletedHandler) Read(data []byte) (interface{}, error) {
-	msg := &messages.OrderCreated{}
-
-	err := proto.Unmarshal(data, msg)
-	if err != nil {
-		return nil, err
-	}
-	return msg, nil
-}
-func (h *OrderCompletedHandler) Is(m *Message) bool {
-	if m.Type != OrderCompletedType {
-		return false
-	}
-	_, ok := m.Content.(*messages.OrderCreated)
-	return ok
-}

message-handler_test.go

@@ -1,129 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"testing"
-
-	messages "git.tornberg.me/go-cart-actor/proto"
-)
-
-func TestAddRequest(t *testing.T) {
-	h, err := GetMessageHandler(AddRequestType)
-	if err != nil {
-		t.Errorf("Error getting message handler: %v\n", err)
-	}
-	if h == nil {
-		t.Errorf("Expected message handler, got nil\n")
-	}
-	message := Message{
-		Type: AddRequestType,
-		Content: &messages.AddRequest{
-			Quantity: 2,
-			Sku:      "123",
-		},
-	}
-	var b bytes.Buffer
-	err = h.Write(&message, &b)
-	if err != nil {
-		t.Errorf("Error writing message: %v\n", err)
-	}
-	result, err := h.Read(b.Bytes())
-	if err != nil {
-		t.Errorf("Error reading message: %v\n", err)
-	}
-	if result == nil {
-		t.Errorf("Expected result, got nil\n")
-	}
-	r, ok := result.(*messages.AddRequest)
-	if !ok {
-		t.Errorf("Expected AddRequest, got %T\n", result)
-	}
-	if r.Quantity != 2 {
-		t.Errorf("Expected quantity 2, got %d\n", r.Quantity)
-	}
-	if r.Sku != "123" {
-		t.Errorf("Expected sku '123', got %s\n", r.Sku)
-	}
-}
-
-func TestItemRequest(t *testing.T) {
-	h, err := GetMessageHandler(AddItemType)
-	if err != nil {
-		t.Errorf("Error getting message handler: %v\n", err)
-	}
-	if h == nil {
-		t.Errorf("Expected message handler, got nil\n")
-	}
-	message := Message{
-		Type: AddItemType,
-		Content: &messages.AddItem{
-			Quantity: 2,
-			Sku:      "123",
-			Price:    100,
-			Name:     "Test item",
-			Image:    "test.jpg",
-		},
-	}
-	var b bytes.Buffer
-	err = h.Write(&message, &b)
-	if err != nil {
-		t.Errorf("Error writing message: %v\n", err)
-	}
-	result, err := h.Read(b.Bytes())
-	if err != nil {
-		t.Errorf("Error reading message: %v\n", err)
-	}
-	if result == nil {
-		t.Errorf("Expected result, got nil\n")
-	}
-	var r *messages.AddItem
-	ok := h.Is(&message)
-	if !ok {
-		t.Errorf("Expected AddRequest, got %T\n", result)
-	}
-	if r.Quantity != 2 {
-		t.Errorf("Expected quantity 2, got %d\n", r.Quantity)
-	}
-	if r.Sku != "123" {
-		t.Errorf("Expected sku '123', got %s\n", r.Sku)
-	}
-}
-
-func TestSetDeliveryMssage(t *testing.T) {
-	h, err := GetMessageHandler(SetDeliveryType)
-	if err != nil {
-		t.Errorf("Error getting message handler: %v\n", err)
-	}
-	if h == nil {
-		t.Errorf("Expected message handler, got nil\n")
-	}
-	message := Message{
-		Type: SetDeliveryType,
-		Content: &messages.SetDelivery{
-			Provider: "test",
-			Items:    []int64{1, 2},
-		},
-	}
-	var b bytes.Buffer
-	err = h.Write(&message, &b)
-	if err != nil {
-		t.Errorf("Error writing message: %v\n", err)
-	}
-	result, err := h.Read(b.Bytes())
-	if err != nil {
-		t.Errorf("Error reading message: %v\n", err)
-	}
-	if result == nil {
-		t.Errorf("Expected result, got nil\n")
-	}
-	r, ok := result.(*messages.SetDelivery)
-	if !ok {
-		t.Errorf("Expected AddRequest, got %T\n", result)
-	}
-	if len(r.Items) != 2 {
-		t.Errorf("Expected 2 items, got %d\n", len(r.Items))
-	}
-	if r.Provider != "test" {
-		t.Errorf("Expected provider 'test', got %s\n", r.Provider)
-	}
-}

message-types.go

@@ -1,15 +0,0 @@
-package main
-
-const (
-	AddRequestType = 1
-	AddItemType    = 2
-
-	RemoveItemType          = 4
-	RemoveDeliveryType      = 5
-	ChangeQuantityType      = 6
-	SetDeliveryType         = 7
-	SetPickupPointType      = 8
-	CreateCheckoutOrderType = 9
-	SetCartItemsType        = 10
-	OrderCompletedType      = 11
-)

message.go

@@ -1,94 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"encoding/binary"
-	"io"
-	"time"
-)
-
-type StorableMessage interface {
-	Write(w io.Writer) error
-}
-
-type Message struct {
-	Type      uint16
-	TimeStamp *int64
-	Content   interface{}
-}
-
-type MessageWriter struct {
-	io.Writer
-}
-
-type StorableMessageHeader struct {
-	Version    uint16
-	Type       uint16
-	TimeStamp  int64
-	DataLength uint64
-}
-
-func GetData(fn func(w io.Writer) error) ([]byte, error) {
-	var buf bytes.Buffer
-	err := fn(&buf)
-	if err != nil {
-		return nil, err
-	}
-	b := buf.Bytes()
-	return b, nil
-}
-
-func (m Message) Write(w io.Writer) error {
-	h, err := GetMessageHandler(m.Type)
-	if err != nil {
-		return err
-	}
-	data, err := GetData(func(w io.Writer) error {
-		return h.Write(&m, w)
-	})
-	if err != nil {
-		return err
-	}
-	ts := time.Now().Unix()
-	if m.TimeStamp != nil {
-		ts = *m.TimeStamp
-	}
-
-	err = binary.Write(w, binary.LittleEndian, StorableMessageHeader{
-		Version:    1,
-		Type:       m.Type,
-		TimeStamp:  ts,
-		DataLength: uint64(len(data)),
-	})
-	w.Write(data)
-
-	return err
-}
-
-func ReadMessage(reader io.Reader, m *Message) error {
-
-	header := StorableMessageHeader{}
-	err := binary.Read(reader, binary.LittleEndian, &header)
-	if err != nil {
-		return err
-	}
-	messageBytes := make([]byte, header.DataLength)
-	_, err = reader.Read(messageBytes)
-	if err != nil {
-		return err
-	}
-	h, err := GetMessageHandler(header.Type)
-	if err != nil {
-		return err
-	}
-	content, err := h.Read(messageBytes)
-	if err != nil {
-		return err
-	}
-	m.Content = content
-
-	m.Type = header.Type
-	m.TimeStamp = &header.TimeStamp
-
-	return nil
-}

mutation_add_item.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"fmt"
+
+	messages "git.tornberg.me/go-cart-actor/proto"
+)
+
+// mutation_add_item.go
+//
+// Registers the AddItem cart mutation in the generic mutation registry.
+// This replaces the legacy switch-based logic previously found in CartGrain.Apply.
+//
+// Behavior:
+//   * Validates quantity > 0
+//   * If an item with same SKU exists -> increases quantity
+//   * Else creates a new CartItem with computed tax amounts
+//   * Totals recalculated automatically via WithTotals()
+//
+// NOTE: Any future field additions in messages.AddItem that affect pricing / tax
+// must keep this handler in sync.
+
+func init() {
+	RegisterMutation[messages.AddItem](
+		"AddItem",
+		func(g *CartGrain, m *messages.AddItem) error {
+			if m == nil {
+				return fmt.Errorf("AddItem: nil payload")
+			}
+			if m.Quantity < 1 {
+				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 {
+				existing.Quantity += int(m.Quantity)
+				return nil
+			}
+
+			g.mu.Lock()
+			defer g.mu.Unlock()
+
+			g.lastItemId++
+			taxRate := 2500
+			if m.Tax > 0 {
+				taxRate = int(m.Tax)
+			}
+			taxAmountPerUnit := GetTaxAmount(m.Price, taxRate)
+
+			g.Items = append(g.Items, &CartItem{
+				Id:          g.lastItemId,
+				ItemId:      int(m.ItemId),
+				Quantity:    int(m.Quantity),
+				Sku:         m.Sku,
+				Name:        m.Name,
+				Price:       m.Price,
+				TotalPrice:  m.Price * int64(m.Quantity),
+				TotalTax:    int64(taxAmountPerUnit * int64(m.Quantity)),
+				Image:       m.Image,
+				Stock:       StockStatus(m.Stock),
+				Disclaimer:  m.Disclaimer,
+				Brand:       m.Brand,
+				Category:    m.Category,
+				Category2:   m.Category2,
+				Category3:   m.Category3,
+				Category4:   m.Category4,
+				Category5:   m.Category5,
+				OrgPrice:    m.OrgPrice,
+				ArticleType: m.ArticleType,
+				Outlet:      m.Outlet,
+				SellerId:    m.SellerId,
+				SellerName:  m.SellerName,
+				Tax:         int(taxAmountPerUnit),
+				TaxRate:     taxRate,
+				StoreId:     m.StoreId,
+			})
+
+			return nil
+		},
+		WithTotals(), // Recalculate totals after successful mutation
+	)
+}

mutation_add_request.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"fmt"
+
+	messages "git.tornberg.me/go-cart-actor/proto"
+)
+
+// mutation_add_request.go
+//
+// Registers the AddRequest mutation. This mutation is a higher-level intent
+// (add by SKU + quantity) which may translate into either:
+//   - Increasing quantity of an existing line (same SKU), OR
+//   - Creating a new item by performing a product lookup (via getItemData inside CartGrain.AddItem)
+//
+// Behavior:
+//   - Validates non-empty SKU and quantity > 0
+//   - If an item with the SKU already exists: increments its quantity
+//   - Else delegates to CartGrain.AddItem (which itself produces an AddItem mutation)
+//   - Totals recalculated automatically (WithTotals)
+//
+// NOTE:
+//   - This handler purposely avoids duplicating the detailed AddItem logic;
+//     it reuses CartGrain.AddItem which then flows through the AddItem mutation
+//     registry handler.
+//   - Double total recalculation can occur (AddItem has WithTotals too), but
+//     is acceptable for clarity. Optimize later if needed.
+//
+// Potential future improvements:
+//   - Stock validation before increasing quantity
+//   - Reservation logic or concurrency guards around stock updates
+//   - Coupon / pricing rules applied conditionally during add-by-sku
+func init() {
+	RegisterMutation[messages.AddRequest](
+		"AddRequest",
+		func(g *CartGrain, m *messages.AddRequest) error {
+			if m == nil {
+				return fmt.Errorf("AddRequest: nil payload")
+			}
+			if m.Sku == "" {
+				return fmt.Errorf("AddRequest: sku is empty")
+			}
+			if m.Quantity < 1 {
+				return fmt.Errorf("AddRequest: invalid quantity %d", m.Quantity)
+			}
+
+			// Existing line: accumulate quantity only.
+			if existing, found := g.FindItemWithSku(m.Sku); found {
+				existing.Quantity += int(m.Quantity)
+				return nil
+			}
+
+			// New line: delegate to higher-level AddItem flow (product lookup).
+			// We intentionally ignore the returned *CartGrain; registry will
+			// do totals again after this handler returns (harmless).
+			_, err := g.AddItem(m.Sku, int(m.Quantity), m.Country, m.StoreId)
+			return err
+		},
+		WithTotals(),
+	)
+}

mutation_change_quantity.go

@@ -0,0 +1,58 @@
+package main
+
+import (
+	"fmt"
+
+	messages "git.tornberg.me/go-cart-actor/proto"
+)
+
+// mutation_change_quantity.go
+//
+// Registers the ChangeQuantity mutation.
+//
+// Behavior:
+//   - Locates an item by its cart-local line item Id (not source item_id).
+//   - If requested quantity <= 0 the line is removed.
+//   - Otherwise the line's Quantity field is updated.
+//   - Totals are recalculated (WithTotals).
+//
+// Error handling:
+//   - Returns an error if the item Id is not found.
+//   - Returns an error if payload is nil (defensive).
+//
+// Concurrency:
+//   - Uses the grain's RW-safe mutation pattern: we mutate in place under
+//     the grain's implicit expectation that higher layers control access.
+//     (If strict locking is required around every mutation, wrap logic in
+//     an explicit g.mu.Lock()/Unlock(), but current model mirrors prior code.)
+func init() {
+	RegisterMutation[messages.ChangeQuantity](
+		"ChangeQuantity",
+		func(g *CartGrain, m *messages.ChangeQuantity) error {
+			if m == nil {
+				return fmt.Errorf("ChangeQuantity: nil payload")
+			}
+
+			foundIndex := -1
+			for i, it := range g.Items {
+				if it.Id == int(m.Id) {
+					foundIndex = i
+					break
+				}
+			}
+			if foundIndex == -1 {
+				return fmt.Errorf("ChangeQuantity: item id %d not found", m.Id)
+			}
+
+			if m.Quantity <= 0 {
+				// Remove the item
+				g.Items = append(g.Items[:foundIndex], g.Items[foundIndex+1:]...)
+				return nil
+			}
+
+			g.Items[foundIndex].Quantity = int(m.Quantity)
+			return nil
+		},
+		WithTotals(),
+	)
+}

mutation_initialize_checkout.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"fmt"
+
+	messages "git.tornberg.me/go-cart-actor/proto"
+)
+
+// mutation_initialize_checkout.go
+//
+// Registers the InitializeCheckout mutation.
+// This mutation is invoked AFTER an external Klarna checkout session
+// has been successfully created or updated. It persists the Klarna
+// order reference / status and marks the cart as having a payment in progress.
+//
+// Behavior:
+//   - Sets OrderReference to the Klarna order ID (overwriting if already set).
+//   - Sets PaymentStatus to the current Klarna status.
+//   - Sets / updates PaymentInProgress flag.
+//   - Does NOT alter pricing or line items (so no totals recalculation).
+//
+// Validation:
+//   - Returns an error if payload is nil.
+//   - Returns an error if orderId is empty (integrity guard).
+//
+// Concurrency:
+//   - Relies on upstream mutation serialization for a single grain. If
+//     parallel checkout attempts are possible, add higher-level guards
+//     (e.g. reject if PaymentInProgress already true unless reusing
+//     the same OrderReference).
+func init() {
+	RegisterMutation[messages.InitializeCheckout](
+		"InitializeCheckout",
+		func(g *CartGrain, m *messages.InitializeCheckout) error {
+			if m == nil {
+				return fmt.Errorf("InitializeCheckout: nil payload")
+			}
+			if m.OrderId == "" {
+				return fmt.Errorf("InitializeCheckout: missing orderId")
+			}
+
+			g.OrderReference = m.OrderId
+			g.PaymentStatus = m.Status
+			g.PaymentInProgress = m.PaymentInProgress
+			return nil
+		},
+		// No WithTotals(): monetary aggregates are unaffected.
+	)
+}

mutation_order_created.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"fmt"
+
+	messages "git.tornberg.me/go-cart-actor/proto"
+)
+
+// mutation_order_created.go
+//
+// Registers the OrderCreated mutation.
+//
+// This mutation represents the completion (or state transition) of an order
+// initiated earlier via InitializeCheckout / external Klarna processing.
+// It finalizes (or updates) the cart's order metadata.
+//
+// Behavior:
+//   - Validates payload non-nil and OrderId not empty.
+//   - Sets (or overwrites) OrderReference with the provided OrderId.
+//   - Sets PaymentStatus from payload.Status.
+//   - Marks PaymentInProgress = false (checkout flow finished / acknowledged).
+//   - Does NOT adjust monetary totals (no WithTotals()).
+//
+// Notes / Future Extensions:
+//   - If multiple order completion events can arrive (e.g., retries / webhook
+//     replays), this handler is idempotent: it simply overwrites fields.
+//   - If you need to guard against conflicting order IDs, add a check:
+//     if g.OrderReference != "" && g.OrderReference != m.OrderId { ... }
+//   - Add audit logging or metrics here if required.
+//
+// Concurrency:
+//   - Relies on the higher-level guarantee that Apply() calls are serialized
+//     per grain. If out-of-order events are possible, embed versioning or
+//     timestamps in the mutation and compare before applying changes.
+func init() {
+	RegisterMutation[messages.OrderCreated](
+		"OrderCreated",
+		func(g *CartGrain, m *messages.OrderCreated) error {
+			if m == nil {
+				return fmt.Errorf("OrderCreated: nil payload")
+			}
+			if m.OrderId == "" {
+				return fmt.Errorf("OrderCreated: missing orderId")
+			}
+
+			g.OrderReference = m.OrderId
+			g.PaymentStatus = m.Status
+			g.PaymentInProgress = false
+			return nil
+		},
+		// No WithTotals(): order completion does not modify pricing or taxes.
+	)
+}

mutation_registry.go

@@ -0,0 +1,301 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+	"sync"
+)
+
+// mutation_registry.go
+//
+// Mutation Registry Infrastructure
+// --------------------------------
+// This file introduces a generic registry for cart mutations that:
+//
+// 1. Decouples mutation logic from the large type-switch inside CartGrain.Apply.
+// 2. Enforces (at registration time) that every mutation handler has the correct
+//    signature: func(*CartGrain, *T) error
+// 3. Optionally auto-updates cart totals after a mutation if flagged.
+// 4. Provides a single authoritative list of registered mutations for
+//    introspection / coverage testing.
+// 5. Allows incremental migration: you can first register new mutations here,
+//    and later prune the legacy switch cases.
+//
+// Usage Pattern
+// -------------
+//   // Define your mutation proto message (e.g. messages.ApplyCoupon in messages.proto)
+//   // Regenerate protobufs.
+//
+//   // In an init() (ideally in a small file like mutations_apply_coupon.go)
+//   func init() {
+//       RegisterMutation[*messages.ApplyCoupon](
+//           "ApplyCoupon",
+//           func(g *CartGrain, m *messages.ApplyCoupon) error {
+//               // domain logic ...
+//               discount := int64(5000)
+//               if g.TotalPrice < discount {
+//                   discount = g.TotalPrice
+//               }
+//               g.TotalDiscount += discount
+//               g.TotalPrice -= discount
+//               return nil
+//           },
+//           WithTotals(), // we changed price-related fields; recalc totals
+//       )
+//   }
+//
+//   // To invoke dynamically (alternative to the current switch):
+//   if updated, err := ApplyRegistered(grain, incomingMessage); err == nil {
+//       grain = updated
+//   } else if errors.Is(err, ErrMutationNotRegistered) {
+//       // fallback to legacy switch logic
+//   }
+//
+// Migration Strategy
+// ------------------
+// 1. For each existing mutation handled in CartGrain.Apply, add a registry
+//    registration with equivalent logic.
+// 2. Add a test that enumerates all *expected* mutation proto types and asserts
+//    they are present in RegisteredMutationTypes().
+// 3. Once coverage is 100%, replace the switch in CartGrain.Apply with a call
+//    to ApplyRegistered (and optionally keep a minimal default to produce an
+//    "unsupported mutation" error).
+//
+// Thread Safety
+// -------------
+// Registration is typically done at init() time; a RWMutex provides safety
+// should late dynamic registration ever be introduced.
+//
+// Auto Totals
+// -----------
+// Many mutations require recomputing totals. To avoid forgetting this, pass
+// WithTotals() when registering. This will invoke grain.UpdateTotals() after
+// the handler returns successfully.
+//
+// Error Semantics
+// ---------------
+// - If a handler returns an error, totals are NOT recalculated (even if
+//   WithTotals() was specified).
+// - ApplyRegistered returns (nil, ErrMutationNotRegistered) if the message type
+//   is absent.
+//
+// Extensibility
+// -------------
+// It is straightforward to add options like audit hooks, metrics wrappers,
+// or optimistic concurrency guards by extending MutationOption.
+//
+// NOTE: Generics require Go 1.18+. If constrained to earlier Go versions,
+//       replace the generic registration with a non-generic RegisterMutationType
+//       that accepts reflect.Type and an adapter function.
+//
+// ---------------------------------------------------------------------------
+
+var (
+	mutationRegistryMu sync.RWMutex
+	mutationRegistry   = make(map[reflect.Type]*registeredMutation)
+
+	// ErrMutationNotRegistered is returned when no handler exists for a given mutation type.
+	ErrMutationNotRegistered = fmt.Errorf("mutation not registered")
+)
+
+// MutationOption configures additional behavior for a registered mutation.
+type MutationOption func(*mutationOptions)
+
+// mutationOptions holds flags adjustable per registration.
+type mutationOptions struct {
+	updateTotals bool
+}
+
+// WithTotals ensures CartGrain.UpdateTotals() is called after a successful handler.
+func WithTotals() MutationOption {
+	return func(o *mutationOptions) {
+		o.updateTotals = true
+	}
+}
+
+// registeredMutation stores metadata + the execution closure.
+type registeredMutation struct {
+	name         string
+	handler      func(*CartGrain, interface{}) error
+	updateTotals bool
+	msgType      reflect.Type
+}
+
+// RegisterMutation registers a mutation handler for a specific message type T.
+//
+// Parameters:
+//
+//	name    - a human-readable identifier (used for diagnostics / coverage tests).
+//	handler - business logic operating on the cart grain & strongly typed message.
+//	options - optional behavior flags (e.g., WithTotals()).
+//
+// Panics if:
+//   - name is empty
+//   - handler is nil
+//   - duplicate registration for the same message type T
+//
+// Typical call is placed in an init() function.
+func RegisterMutation[T any](name string, handler func(*CartGrain, *T) error, options ...MutationOption) {
+	if name == "" {
+		panic("RegisterMutation: name is required")
+	}
+	if handler == nil {
+		panic("RegisterMutation: handler is nil")
+	}
+
+	// Derive the reflect.Type for *T then its Elem (T) for mapping.
+	var zero *T
+	rtPtr := reflect.TypeOf(zero)
+	if rtPtr.Kind() != reflect.Ptr {
+		panic("RegisterMutation: expected pointer type for generic parameter")
+	}
+	rt := rtPtr.Elem()
+
+	opts := mutationOptions{}
+	for _, opt := range options {
+		opt(&opts)
+	}
+
+	wrapped := func(g *CartGrain, m interface{}) error {
+		typed, ok := m.(*T)
+		if !ok {
+			return fmt.Errorf("mutation type mismatch: have %T want *%s", m, rt.Name())
+		}
+		return handler(g, typed)
+	}
+
+	mutationRegistryMu.Lock()
+	defer mutationRegistryMu.Unlock()
+
+	if _, exists := mutationRegistry[rt]; exists {
+		panic(fmt.Sprintf("RegisterMutation: duplicate registration for type %s", rt.String()))
+	}
+
+	mutationRegistry[rt] = &registeredMutation{
+		name:         name,
+		handler:      wrapped,
+		updateTotals: opts.updateTotals,
+		msgType:      rt,
+	}
+}
+
+// ApplyRegistered attempts to apply a registered mutation.
+// Returns updated grain if successful.
+//
+// If the mutation is not registered, returns (nil, ErrMutationNotRegistered).
+func ApplyRegistered(grain *CartGrain, msg interface{}) (*CartGrain, error) {
+	if grain == nil {
+		return nil, fmt.Errorf("nil grain")
+	}
+	if msg == nil {
+		return nil, fmt.Errorf("nil mutation message")
+	}
+
+	rt := indirectType(reflect.TypeOf(msg))
+	mutationRegistryMu.RLock()
+	entry, ok := mutationRegistry[rt]
+	mutationRegistryMu.RUnlock()
+
+	if !ok {
+		return nil, ErrMutationNotRegistered
+	}
+
+	if err := entry.handler(grain, msg); err != nil {
+		return nil, err
+	}
+
+	if entry.updateTotals {
+		grain.UpdateTotals()
+	}
+
+	return grain, nil
+}
+
+// RegisteredMutations returns metadata for all registered mutations (snapshot).
+func RegisteredMutations() []string {
+	mutationRegistryMu.RLock()
+	defer mutationRegistryMu.RUnlock()
+	out := make([]string, 0, len(mutationRegistry))
+	for _, entry := range mutationRegistry {
+		out = append(out, entry.name)
+	}
+	return out
+}
+
+// RegisteredMutationTypes returns the reflect.Type list of all registered messages.
+// Useful for coverage tests ensuring expected set matches actual set.
+func RegisteredMutationTypes() []reflect.Type {
+	mutationRegistryMu.RLock()
+	defer mutationRegistryMu.RUnlock()
+	out := make([]reflect.Type, 0, len(mutationRegistry))
+	for t := range mutationRegistry {
+		out = append(out, t)
+	}
+	return out
+}
+
+// MustAssertMutationCoverage can be called at startup to ensure every expected
+// mutation type has been registered. It panics with a descriptive message if any
+// are missing. Provide a slice of prototype pointers (e.g. []*messages.AddItem{nil} ...)
+func MustAssertMutationCoverage(expected []interface{}) {
+	mutationRegistryMu.RLock()
+	defer mutationRegistryMu.RUnlock()
+
+	missing := make([]string, 0)
+	for _, ex := range expected {
+		if ex == nil {
+			continue
+		}
+		t := indirectType(reflect.TypeOf(ex))
+		if _, ok := mutationRegistry[t]; !ok {
+			missing = append(missing, t.String())
+		}
+	}
+	if len(missing) > 0 {
+		panic(fmt.Sprintf("mutation registry missing handlers for: %v", missing))
+	}
+}
+
+// indirectType returns the element type if given a pointer; otherwise the type itself.
+func indirectType(t reflect.Type) reflect.Type {
+	for t.Kind() == reflect.Ptr {
+		t = t.Elem()
+	}
+	return t
+}
+
+/*
+Integration Guide
+-----------------
+
+1. Register all existing mutations:
+
+   func init() {
+       RegisterMutation[*messages.AddItem]("AddItem",
+           func(g *CartGrain, m *messages.AddItem) error {
+               // (port logic from existing switch branch)
+               // ...
+               return nil
+           },
+           WithTotals(),
+       )
+       // ... repeat for others
+   }
+
+2. In CartGrain.Apply (early in the method) add:
+
+   if updated, err := ApplyRegistered(c, content); err == nil {
+       return updated, nil
+   } else if err != ErrMutationNotRegistered {
+       return nil, err
+   }
+
+   // existing switch fallback below
+
+3. Once all mutations are registered, remove the legacy switch cases
+   and leave a single ErrMutationNotRegistered path for unknown types.
+
+4. Add a coverage test (see docs for example; removed from source for clarity).
+5. (Optional) Add metrics / tracing wrappers for handlers.
+
+*/

mutation_remove_delivery.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"fmt"
+
+	messages "git.tornberg.me/go-cart-actor/proto"
+)
+
+// mutation_remove_delivery.go
+//
+// Registers the RemoveDelivery mutation.
+//
+// Behavior:
+//   - Removes the delivery entry whose Id == payload.Id.
+//   - If not found, returns an error.
+//   - Cart totals are recalculated (WithTotals) after removal.
+//   - Items previously associated with that delivery simply become "without delivery";
+//     subsequent delivery mutations can reassign them.
+//
+// Differences vs legacy:
+//   - Legacy logic decremented TotalPrice explicitly before recalculating.
+//     Here we rely solely on UpdateTotals() to recompute from remaining
+//     deliveries and items (simpler / single source of truth).
+//
+// Future considerations:
+//   - If delivery pricing logic changes (e.g., dynamic taxes per delivery),
+//     UpdateTotals() may need enhancement to incorporate delivery tax properly.
+func init() {
+	RegisterMutation[messages.RemoveDelivery](
+		"RemoveDelivery",
+		func(g *CartGrain, m *messages.RemoveDelivery) error {
+			if m == nil {
+				return fmt.Errorf("RemoveDelivery: nil payload")
+			}
+			targetID := int(m.Id)
+			index := -1
+			for i, d := range g.Deliveries {
+				if d.Id == targetID {
+					index = i
+					break
+				}
+			}
+			if index == -1 {
+				return fmt.Errorf("RemoveDelivery: delivery id %d not found", m.Id)
+			}
+
+			// Remove delivery (order not preserved beyond necessity)
+			g.Deliveries = append(g.Deliveries[:index], g.Deliveries[index+1:]...)
+			return nil
+		},
+		WithTotals(),
+	)
+}

mutation_remove_item.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"fmt"
+
+	messages "git.tornberg.me/go-cart-actor/proto"
+)
+
+// mutation_remove_item.go
+//
+// Registers the RemoveItem mutation.
+//
+// Behavior:
+//   - Removes the cart line whose local cart line Id == payload.Id
+//   - If no such line exists returns an error
+//   - Recalculates cart totals (WithTotals)
+//
+// Notes:
+//   - This removes only the line item; any deliveries referencing the removed
+//     item are NOT automatically adjusted (mirrors prior logic). If future
+//     semantics require pruning delivery.item_ids you can extend this handler.
+//   - If multiple lines somehow shared the same Id (should not happen), only
+//     the first match would be removed—data integrity relies on unique line Ids.
+func init() {
+	RegisterMutation[messages.RemoveItem](
+		"RemoveItem",
+		func(g *CartGrain, m *messages.RemoveItem) error {
+			if m == nil {
+				return fmt.Errorf("RemoveItem: nil payload")
+			}
+			targetID := int(m.Id)
+
+			index := -1
+			for i, it := range g.Items {
+				if it.Id == targetID {
+					index = i
+					break
+				}
+			}
+			if index == -1 {
+				return fmt.Errorf("RemoveItem: item id %d not found", m.Id)
+			}
+
+			g.Items = append(g.Items[:index], g.Items[index+1:]...)
+			return nil
+		},
+		WithTotals(),
+	)
+}

mutation_set_cart_items.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"fmt"
+
+	messages "git.tornberg.me/go-cart-actor/proto"
+)
+
+// mutation_set_cart_items.go
+//
+// Registers the SetCartRequest mutation. This mutation replaces the entire list
+// of cart items with the provided list (each entry is an AddRequest).
+//
+// Behavior:
+//   - Clears existing items (but leaves deliveries intact).
+//   - Iterates over each AddRequest and delegates to CartGrain.AddItem
+//     (which performs product lookup, creates AddItem mutation).
+//   - If any single addition fails, the mutation aborts with an error;
+//     items added prior to the failure remain (consistent with previous behavior).
+//   - Totals recalculated after completion via WithTotals().
+//
+// Notes:
+//   - Potential optimization: batch product lookups; currently sequential.
+//   - Consider adding rollback semantics if atomic replacement is desired.
+//   - Deliveries might reference item IDs that are now invalid—original logic
+//     also left deliveries untouched. If that becomes an issue, add a cleanup
+//     pass to remove deliveries whose item IDs no longer exist.
+func init() {
+	RegisterMutation[messages.SetCartRequest](
+		"SetCartRequest",
+		func(g *CartGrain, m *messages.SetCartRequest) error {
+			if m == nil {
+				return fmt.Errorf("SetCartRequest: nil payload")
+			}
+
+			// Clear current items (keep deliveries)
+			g.mu.Lock()
+			g.Items = make([]*CartItem, 0, len(m.Items))
+			g.mu.Unlock()
+
+			for _, it := range m.Items {
+				if it == nil {
+					continue
+				}
+				if it.Sku == "" || it.Quantity < 1 {
+					return fmt.Errorf("SetCartRequest: invalid item (sku='%s' qty=%d)", it.Sku, it.Quantity)
+				}
+				_, err := g.AddItem(it.Sku, int(it.Quantity), it.Country, it.StoreId)
+				if err != nil {
+					return fmt.Errorf("SetCartRequest: add sku '%s' failed: %w", it.Sku, err)
+				}
+			}
+			return nil
+		},
+		WithTotals(),
+	)
+}

mutation_set_delivery.go

@@ -0,0 +1,101 @@
+package main
+
+import (
+	"fmt"
+	"slices"
+
+	messages "git.tornberg.me/go-cart-actor/proto"
+)
+
+// mutation_set_delivery.go
+//
+// Registers the SetDelivery mutation.
+//
+// Semantics (mirrors legacy switch logic):
+//   - If the payload specifies an explicit list of item IDs (payload.Items):
+//   - Each referenced cart line must exist.
+//   - None of the referenced items may already belong to a delivery.
+//   - Only those items are associated with the new delivery.
+//   - If payload.Items is empty:
+//   - All items currently without any delivery are associated with the new delivery.
+//   - A new delivery line is created with:
+//   - Auto-incremented delivery ID (cart-local)
+//   - Provider from payload
+//   - Fixed price (currently hard-coded: 4900 minor units) – adjust as needed
+//   - Optional PickupPoint copied from payload
+//   - Cart totals are recalculated (WithTotals)
+//
+// Error cases:
+//   - Referenced item does not exist
+//   - Referenced item already has a delivery
+//   - No items qualify (resulting association set empty) -> returns error (prevents creating empty delivery)
+//
+// Concurrency:
+//   - Uses g.mu to protect lastDeliveryId increment and append to Deliveries slice.
+//     Item scans are read-only and performed outside the lock for simplicity;
+//     if stricter guarantees are needed, widen the lock section.
+//
+// Future extension points:
+//   - Variable delivery pricing (based on weight, distance, provider, etc.)
+//   - Validation of provider codes
+//   - Multi-currency delivery pricing
+func init() {
+	RegisterMutation[messages.SetDelivery](
+		"SetDelivery",
+		func(g *CartGrain, m *messages.SetDelivery) error {
+			if m == nil {
+				return fmt.Errorf("SetDelivery: nil payload")
+			}
+			if m.Provider == "" {
+				return fmt.Errorf("SetDelivery: provider is empty")
+			}
+
+			withDelivery := g.ItemsWithDelivery()
+			targetItems := make([]int, 0)
+
+			if len(m.Items) == 0 {
+				// Use every item currently without a delivery
+				targetItems = append(targetItems, g.ItemsWithoutDelivery()...)
+			} else {
+				// Validate explicit list
+				for _, id64 := range m.Items {
+					id := int(id64)
+					found := false
+					for _, it := range g.Items {
+						if it.Id == id {
+							found = true
+							break
+						}
+					}
+					if !found {
+						return fmt.Errorf("SetDelivery: item id %d not found", id)
+					}
+					if slices.Contains(withDelivery, id) {
+						return fmt.Errorf("SetDelivery: item id %d already has a delivery", id)
+					}
+					targetItems = append(targetItems, id)
+				}
+			}
+
+			if len(targetItems) == 0 {
+				return fmt.Errorf("SetDelivery: no eligible items to attach")
+			}
+
+			// Append new delivery
+			g.mu.Lock()
+			g.lastDeliveryId++
+			newId := g.lastDeliveryId
+			g.Deliveries = append(g.Deliveries, &CartDelivery{
+				Id:          newId,
+				Provider:    m.Provider,
+				PickupPoint: m.PickupPoint,
+				Price:       4900, // TODO: externalize pricing
+				Items:       targetItems,
+			})
+			g.mu.Unlock()
+
+			return nil
+		},
+		WithTotals(),
+	)
+}

mutation_set_pickup_point.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"fmt"
+
+	messages "git.tornberg.me/go-cart-actor/proto"
+)
+
+// mutation_set_pickup_point.go
+//
+// Registers the SetPickupPoint mutation using the generic mutation registry.
+//
+// Semantics (mirrors original switch-based implementation):
+//   - Locate the delivery with Id == payload.DeliveryId
+//   - Set (or overwrite) its PickupPoint with the provided data
+//   - Does NOT alter pricing or taxes (so no totals recalculation required)
+//
+// Validation / Error Handling:
+//   - If payload is nil -> error
+//   - If DeliveryId not found -> error
+//
+// Concurrency:
+//   - Relies on the existing expectation that higher-level mutation routing
+//     serializes Apply() calls per grain; if stricter guarantees are needed,
+//     a delivery-level lock could be introduced later.
+//
+// Future Extensions:
+//   - Validate pickup point fields (country code, zip format, etc.)
+//   - Track history / audit of pickup point changes
+//   - Trigger delivery price adjustments (which would then require WithTotals()).
+func init() {
+	RegisterMutation[messages.SetPickupPoint](
+		"SetPickupPoint",
+		func(g *CartGrain, m *messages.SetPickupPoint) error {
+			if m == nil {
+				return fmt.Errorf("SetPickupPoint: nil payload")
+			}
+
+			for _, d := range g.Deliveries {
+				if d.Id == int(m.DeliveryId) {
+					d.PickupPoint = &messages.PickupPoint{
+						Id:      m.Id,
+						Name:    m.Name,
+						Address: m.Address,
+						City:    m.City,
+						Zip:     m.Zip,
+						Country: m.Country,
+					}
+					return nil
+				}
+			}
+			return fmt.Errorf("SetPickupPoint: delivery id %d not found", m.DeliveryId)
+		},
+		// No WithTotals(): pickup point does not change pricing / tax.
+	)
+}

packet.go

@@ -1,89 +0,0 @@
-package main
-
-const (
-	RemoteGetState            = FrameType(0x01)
-	RemoteHandleMutation      = FrameType(0x02)
-	ResponseBody              = FrameType(0x03)
-	RemoteGetStateReply       = FrameType(0x04)
-	RemoteHandleMutationReply = FrameType(0x05)
-	RemoteCreateOrderReply    = FrameType(0x06)
-)
-
-// type CartPacket struct {
-// 	Version     PackageVersion
-// 	MessageType CartMessage
-// 	DataLength  uint32
-// 	StatusCode  uint32
-// 	Id          CartId
-// }
-
-// type Packet struct {
-// 	Version     PackageVersion
-// 	MessageType PoolMessage
-// 	DataLength  uint32
-// 	StatusCode  uint32
-// }
-
-// var headerData = make([]byte, 4)
-
-// func matchHeader(conn io.Reader) error {
-
-// 	pos := 0
-// 	for pos < 4 {
-
-// 		l, err := conn.Read(headerData)
-// 		if err != nil {
-// 			return err
-// 		}
-// 		for i := 0; i < l; i++ {
-// 			if headerData[i] == header[pos] {
-// 				pos++
-// 				if pos == 4 {
-// 					return nil
-// 				}
-// 			} else {
-// 				pos = 0
-// 			}
-// 		}
-// 	}
-// 	return nil
-// }
-
-// func ReadPacket(conn io.Reader, packet *Packet) error {
-// 	err := matchHeader(conn)
-// 	if err != nil {
-// 		return err
-// 	}
-// 	return binary.Read(conn, binary.LittleEndian, packet)
-// }
-
-// func ReadCartPacket(conn io.Reader, packet *CartPacket) error {
-// 	err := matchHeader(conn)
-// 	if err != nil {
-// 		return err
-// 	}
-// 	return binary.Read(conn, binary.LittleEndian, packet)
-// }
-
-// func GetPacketData(conn io.Reader, len uint32) ([]byte, error) {
-// 	if len == 0 {
-// 		return []byte{}, nil
-// 	}
-// 	data := make([]byte, len)
-// 	_, err := conn.Read(data)
-// 	return data, err
-// }
-
-// func ReceivePacket(conn io.Reader) (uint32, []byte, error) {
-// 	var packet Packet
-// 	err := ReadPacket(conn, &packet)
-// 	if err != nil {
-// 		return 0, nil, err
-// 	}
-
-// 	data, err := GetPacketData(conn, packet.DataLength)
-// 	if err != nil {
-// 		return 0, nil, err
-// 	}
-// 	return packet.MessageType, data, nil
-// }

pool-server.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"log"
@@ -24,21 +25,26 @@ func NewPoolServer(pool GrainPool, pod_name string) *PoolServer {
 	}
 }
 
+func (s *PoolServer) process(id CartId, mutation interface{}) (*messages.CartState, error) {
+	grain, err := s.pool.Apply(id, mutation)
+	if err != nil {
+		return nil, err
+	}
+	return ToCartState(grain), nil
+}
+
 func (s *PoolServer) HandleGet(w http.ResponseWriter, r *http.Request, id CartId) error {
-	data, err := s.pool.Get(id)
+	grain, err := s.pool.Get(id)
 	if err != nil {
 		return err
 	}
 
-	return s.WriteResult(w, data)
+	return s.WriteResult(w, ToCartState(grain))
 }
 
 func (s *PoolServer) HandleAddSku(w http.ResponseWriter, r *http.Request, id CartId) error {
 	sku := r.PathValue("sku")
-	data, err := s.pool.Process(id, Message{
-		Type:    AddRequestType,
-		Content: &messages.AddRequest{Sku: sku, Quantity: 1},
-	})
+	data, err := s.process(id, &messages.AddRequest{Sku: sku, Quantity: 1})
 	if err != nil {
 		return err
 	}
@@ -56,23 +62,20 @@ func ErrorHandler(fn func(w http.ResponseWriter, r *http.Request) error) func(w
 	}
 }
 
-func (s *PoolServer) WriteResult(w http.ResponseWriter, result *FrameWithPayload) error {
+func (s *PoolServer) WriteResult(w http.ResponseWriter, result *messages.CartState) error {
 	w.Header().Set("Content-Type", "application/json")
 	w.Header().Set("Cache-Control", "no-cache")
 	w.Header().Set("Access-Control-Allow-Origin", "*")
 	w.Header().Set("X-Pod-Name", s.pod_name)
-	if result.StatusCode != 200 {
-		log.Printf("Call error: %d\n", result.StatusCode)
-		if result.StatusCode >= 200 && result.StatusCode < 600 {
-			w.WriteHeader(int(result.StatusCode))
-		} else {
+	if result == nil {
+
 		w.WriteHeader(http.StatusInternalServerError)
-		}
-		w.Write([]byte(result.Payload))
+
 		return nil
 	}
 	w.WriteHeader(http.StatusOK)
-	_, err := w.Write(result.Payload)
+	enc := json.NewEncoder(w)
+	err := enc.Encode(result)
 	return err
 }
 
@@ -83,10 +86,7 @@ func (s *PoolServer) HandleDeleteItem(w http.ResponseWriter, r *http.Request, id
 	if err != nil {
 		return err
 	}
-	data, err := s.pool.Process(id, Message{
-		Type:    RemoveItemType,
-		Content: &messages.RemoveItem{Id: int64(itemId)},
-	})
+	data, err := s.process(id, &messages.RemoveItem{Id: int64(itemId)})
 	if err != nil {
 		return err
 	}
@@ -106,13 +106,10 @@ func (s *PoolServer) HandleSetDelivery(w http.ResponseWriter, r *http.Request, i
 	if err != nil {
 		return err
 	}
-	data, err := s.pool.Process(id, Message{
-		Type: SetDeliveryType,
-		Content: &messages.SetDelivery{
+	data, err := s.process(id, &messages.SetDelivery{
 		Provider:    delivery.Provider,
 		Items:       delivery.Items,
 		PickupPoint: delivery.PickupPoint,
-		},
 	})
 	if err != nil {
 		return err
@@ -132,9 +129,7 @@ func (s *PoolServer) HandleSetPickupPoint(w http.ResponseWriter, r *http.Request
 	if err != nil {
 		return err
 	}
-	reply, err := s.pool.Process(id, Message{
-		Type: SetPickupPointType,
-		Content: &messages.SetPickupPoint{
+	reply, err := s.process(id, &messages.SetPickupPoint{
 		DeliveryId: int64(deliveryId),
 		Id:         pickupPoint.Id,
 		Name:       pickupPoint.Name,
@@ -142,7 +137,6 @@ func (s *PoolServer) HandleSetPickupPoint(w http.ResponseWriter, r *http.Request
 		City:       pickupPoint.City,
 		Zip:        pickupPoint.Zip,
 		Country:    pickupPoint.Country,
-		},
 	})
 	if err != nil {
 		return err
@@ -157,10 +151,7 @@ func (s *PoolServer) HandleRemoveDelivery(w http.ResponseWriter, r *http.Request
 	if err != nil {
 		return err
 	}
-	reply, err := s.pool.Process(id, Message{
-		Type:    RemoveDeliveryType,
-		Content: &messages.RemoveDelivery{Id: int64(deliveryId)},
-	})
+	reply, err := s.process(id, &messages.RemoveDelivery{Id: int64(deliveryId)})
 	if err != nil {
 		return err
 	}
@@ -173,10 +164,7 @@ func (s *PoolServer) HandleQuantityChange(w http.ResponseWriter, r *http.Request
 	if err != nil {
 		return err
 	}
-	reply, err := s.pool.Process(id, Message{
-		Type:    ChangeQuantityType,
-		Content: &changeQuantity,
-	})
+	reply, err := s.process(id, &changeQuantity)
 	if err != nil {
 		return err
 	}
@@ -189,10 +177,7 @@ func (s *PoolServer) HandleSetCartItems(w http.ResponseWriter, r *http.Request,
 	if err != nil {
 		return err
 	}
-	reply, err := s.pool.Process(id, Message{
-		Type:    SetCartItemsType,
-		Content: &setCartItems,
-	})
+	reply, err := s.process(id, &setCartItems)
 	if err != nil {
 		return err
 	}
@@ -205,10 +190,7 @@ func (s *PoolServer) HandleAddRequest(w http.ResponseWriter, r *http.Request, id
 	if err != nil {
 		return err
 	}
-	reply, err := s.pool.Process(id, Message{
-		Type:    AddRequestType,
-		Content: &addRequest,
-	})
+	reply, err := s.process(id, &addRequest)
 	if err != nil {
 		return err
 	}
@@ -235,30 +217,50 @@ func (s *PoolServer) HandleConfirmation(w http.ResponseWriter, r *http.Request,
 }
 
 func (s *PoolServer) HandleCheckout(w http.ResponseWriter, r *http.Request, id CartId) error {
+	// Build checkout meta (URLs derived from host)
+	meta := &CheckoutMeta{
+		Terms:        fmt.Sprintf("https://%s/terms", r.Host),
+		Checkout:     fmt.Sprintf("https://%s/checkout?order_id={checkout.order.id}", r.Host),
+		Confirmation: fmt.Sprintf("https://%s/confirmation/{checkout.order.id}", r.Host),
+		Validation:   fmt.Sprintf("https://%s/validate", r.Host),
+		Push:         fmt.Sprintf("https://%s/push?order_id={checkout.order.id}", r.Host),
+		Country:      getCountryFromHost(r.Host),
+	}
 
-	reply, err := s.pool.Process(id, Message{
-		Type: CreateCheckoutOrderType,
-		Content: &messages.CreateCheckoutOrder{
-			Terms:        "https://slask-finder.tornberg.me/terms",
-			Checkout:     "https://slask-finder.tornberg.me/checkout?order_id={checkout.order.id}",
-			Confirmation: "https://slask-finder.tornberg.me/confirmation/{checkout.order.id}",
-			Push:         "https://cart.tornberg.me/push?order_id={checkout.order.id}",
-		},
-	})
+	// Get current grain state (may be local or remote)
+	grain, err := s.pool.Get(id)
 	if err != nil {
 		return err
 	}
-	if reply.StatusCode != 200 {
-		return s.WriteResult(w, reply)
+
+	// Build pure checkout payload
+	payload, _, err := BuildCheckoutOrderPayload(grain, meta)
+	if err != nil {
+		return err
 	}
 
-	// w.Header().Set("Content-Type", "application/json")
-	// w.Header().Set("X-Pod-Name", s.pod_name)
-	// w.Header().Set("Cache-Control", "no-cache")
-	// w.Header().Set("Access-Control-Allow-Origin", "*")
-	// w.WriteHeader(http.StatusOK)
+	// Call Klarna (create or update)
+	var klarnaOrder *CheckoutOrder
+	if grain.OrderReference != "" {
+		klarnaOrder, err = KlarnaInstance.UpdateOrder(grain.OrderReference, bytes.NewReader(payload))
+	} else {
+		klarnaOrder, err = KlarnaInstance.CreateOrder(bytes.NewReader(payload))
+	}
+	if err != nil {
+		return err
+	}
 
-	return s.WriteResult(w, reply)
+	// Persist initialization state via mutation (best-effort)
+	if _, applyErr := s.pool.Apply(id, &messages.InitializeCheckout{
+		OrderId:           klarnaOrder.ID,
+		Status:            klarnaOrder.Status,
+		PaymentInProgress: true,
+	}); applyErr != nil {
+		log.Printf("InitializeCheckout apply error: %v", applyErr)
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	return json.NewEncoder(w).Encode(klarnaOrder)
 }
 
 func NewCartId() CartId {
@@ -276,7 +278,7 @@ func CookieCartIdHandler(fn func(w http.ResponseWriter, r *http.Request, cartId
 			http.SetCookie(w, &http.Cookie{
 				Name:     "cartid",
 				Value:    cartId.String(),
-				Secure:   true,
+				Secure:   r.TLS != nil,
 				HttpOnly: true,
 				Path:     "/",
 				Expires:  time.Now().AddDate(0, 0, 14),
@@ -295,7 +297,7 @@ func (s *PoolServer) RemoveCartCookie(w http.ResponseWriter, r *http.Request, ca
 		Name:     "cartid",
 		Value:    cartId.String(),
 		Path:     "/",
-		Secure:   true,
+		Secure:   r.TLS != nil,
 		HttpOnly: true,
 		Expires:  time.Unix(0, 0),
 		SameSite: http.SameSiteLaxMode,

product-fetcher.go

@@ -16,7 +16,10 @@ func getBaseUrl(country string) string {
 	if country == "no" {
 		return "http://s10n-no.s10n:8080"
 	}
+	if country == "se" {
 		return "http://s10n-se.s10n:8080"
+	}
+	return "http://localhost:8082"
 }
 
 func FetchItem(sku string, country string) (*index.DataItem, error) {

proto/cart_actor.proto

@@ -0,0 +1,188 @@
+syntax = "proto3";
+
+package messages;
+
+option go_package = "git.tornberg.me/go-cart-actor/proto;messages";
+
+import "messages.proto";
+
+// -----------------------------------------------------------------------------
+// Cart Actor gRPC API (Breaking v2 - Per-Mutation RPCs)
+// -----------------------------------------------------------------------------
+// This version removes the previous MutationEnvelope + Mutate RPC.
+// Each mutation now has its own request wrapper and dedicated RPC method
+// providing simpler, type-focused client stubs and enabling per-mutation
+// metrics, auth and rate limiting.
+//
+// Regenerate Go code after editing:
+//   protoc --go_out=. --go_opt=paths=source_relative \
+//          --go-grpc_out=. --go-grpc_opt=paths=source_relative \
+//          proto/cart_actor.proto proto/messages.proto
+//
+// Backward compatibility: This is a breaking change (old clients must update).
+// -----------------------------------------------------------------------------
+
+// Shared reply for all mutation RPCs.
+message CartMutationReply {
+  int32 status_code = 1;          // HTTP-like status (200 success, 4xx client, 5xx server)
+  oneof result {
+    CartState state = 2;          // Updated cart state on success
+    string error = 3;             // Error message on failure
+  }
+  int64 server_timestamp = 4;     // Server-assigned Unix timestamp (optional auditing)
+}
+
+// Fetch current cart state without mutation.
+message StateRequest {
+  string cart_id = 1;
+}
+
+message StateReply {
+  int32 status_code = 1;
+  oneof result {
+    CartState state = 2;
+    string error = 3;
+  }
+}
+
+// Per-mutation request wrappers. We wrap the existing inner mutation
+// messages (defined in messages.proto) to add cart_id + optional metadata
+// without altering the inner message definitions.
+
+message AddRequestRequest {
+  string cart_id = 1;
+  int64 client_timestamp = 2;
+  AddRequest payload = 10;
+}
+
+message AddItemRequest {
+  string cart_id = 1;
+  int64 client_timestamp = 2;
+  AddItem payload = 10;
+}
+
+message RemoveItemRequest {
+  string cart_id = 1;
+  int64 client_timestamp = 2;
+  RemoveItem payload = 10;
+}
+
+message RemoveDeliveryRequest {
+  string cart_id = 1;
+  int64 client_timestamp = 2;
+  RemoveDelivery payload = 10;
+}
+
+message ChangeQuantityRequest {
+  string cart_id = 1;
+  int64 client_timestamp = 2;
+  ChangeQuantity payload = 10;
+}
+
+message SetDeliveryRequest {
+  string cart_id = 1;
+  int64 client_timestamp = 2;
+  SetDelivery payload = 10;
+}
+
+message SetPickupPointRequest {
+  string cart_id = 1;
+  int64 client_timestamp = 2;
+  SetPickupPoint payload = 10;
+}
+
+message CreateCheckoutOrderRequest {
+  string cart_id = 1;
+  int64 client_timestamp = 2;
+  CreateCheckoutOrder payload = 10;
+}
+
+message SetCartItemsRequest {
+  string cart_id = 1;
+  int64 client_timestamp = 2;
+  SetCartRequest payload = 10;
+}
+
+message OrderCompletedRequest {
+  string cart_id = 1;
+  int64 client_timestamp = 2;
+  OrderCreated payload = 10;
+}
+
+// -----------------------------------------------------------------------------
+// Cart state snapshot (unchanged from v1 except envelope removal context)
+// -----------------------------------------------------------------------------
+message CartState {
+  string cart_id = 1;
+  repeated CartItemState items = 2;
+  int64 total_price = 3;
+  int64 total_tax = 4;
+  int64 total_discount = 5;
+  repeated DeliveryState deliveries = 6;
+  bool payment_in_progress = 7;
+  string order_reference = 8;
+  string payment_status = 9;
+}
+
+message CartItemState {
+  int64 id = 1;
+  int64 source_item_id = 2;
+  string sku = 3;
+  string name = 4;
+  int64 unit_price = 5;
+  int32 quantity = 6;
+  int64 total_price = 7;
+  int64 total_tax = 8;
+  int64 org_price = 9;
+  int32 tax_rate = 10;
+  int64 total_discount = 11;
+  string brand = 12;
+  string category = 13;
+  string category2 = 14;
+  string category3 = 15;
+  string category4 = 16;
+  string category5 = 17;
+  string image = 18;
+  string article_type = 19;
+  string seller_id = 20;
+  string seller_name = 21;
+  string disclaimer = 22;
+  string outlet = 23;
+  string store_id = 24;
+  int32 stock = 25;
+}
+
+message DeliveryState {
+  int64 id = 1;
+  string provider = 2;
+  int64 price = 3;
+  repeated int64 item_ids = 4;
+  PickupPoint pickup_point = 5; // Defined in messages.proto
+}
+
+// (CheckoutRequest / CheckoutReply removed - checkout handled at HTTP layer)
+
+// -----------------------------------------------------------------------------
+// Service definition (per-mutation RPCs + checkout)
+// -----------------------------------------------------------------------------
+service CartActor {
+  rpc AddRequest(AddRequestRequest) returns (CartMutationReply);
+  rpc AddItem(AddItemRequest) returns (CartMutationReply);
+  rpc RemoveItem(RemoveItemRequest) returns (CartMutationReply);
+  rpc RemoveDelivery(RemoveDeliveryRequest) returns (CartMutationReply);
+  rpc ChangeQuantity(ChangeQuantityRequest) returns (CartMutationReply);
+  rpc SetDelivery(SetDeliveryRequest) returns (CartMutationReply);
+  rpc SetPickupPoint(SetPickupPointRequest) returns (CartMutationReply);
+  // (Checkout RPC removed - handled externally)
+  rpc SetCartItems(SetCartItemsRequest) returns (CartMutationReply);
+  rpc OrderCompleted(OrderCompletedRequest) returns (CartMutationReply);
+
+  rpc GetState(StateRequest) returns (StateReply);
+}
+
+// -----------------------------------------------------------------------------
+// Future enhancements:
+// * BatchMutate RPC (repeated heterogeneous mutations)
+// * Streaming state updates (WatchState)
+// * Versioning / optimistic concurrency control
+// -----------------------------------------------------------------------------

proto/cart_actor_grpc.pb.go

@@ -0,0 +1,473 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.5.1
+// - protoc             v3.21.12
+// source: cart_actor.proto
+
+package messages
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.64.0 or later.
+const _ = grpc.SupportPackageIsVersion9
+
+const (
+	CartActor_AddRequest_FullMethodName     = "/messages.CartActor/AddRequest"
+	CartActor_AddItem_FullMethodName        = "/messages.CartActor/AddItem"
+	CartActor_RemoveItem_FullMethodName     = "/messages.CartActor/RemoveItem"
+	CartActor_RemoveDelivery_FullMethodName = "/messages.CartActor/RemoveDelivery"
+	CartActor_ChangeQuantity_FullMethodName = "/messages.CartActor/ChangeQuantity"
+	CartActor_SetDelivery_FullMethodName    = "/messages.CartActor/SetDelivery"
+	CartActor_SetPickupPoint_FullMethodName = "/messages.CartActor/SetPickupPoint"
+	CartActor_SetCartItems_FullMethodName   = "/messages.CartActor/SetCartItems"
+	CartActor_OrderCompleted_FullMethodName = "/messages.CartActor/OrderCompleted"
+	CartActor_GetState_FullMethodName       = "/messages.CartActor/GetState"
+)
+
+// CartActorClient is the client API for CartActor service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+//
+// -----------------------------------------------------------------------------
+// Service definition (per-mutation RPCs + checkout)
+// -----------------------------------------------------------------------------
+type CartActorClient interface {
+	AddRequest(ctx context.Context, in *AddRequestRequest, opts ...grpc.CallOption) (*CartMutationReply, error)
+	AddItem(ctx context.Context, in *AddItemRequest, opts ...grpc.CallOption) (*CartMutationReply, error)
+	RemoveItem(ctx context.Context, in *RemoveItemRequest, opts ...grpc.CallOption) (*CartMutationReply, error)
+	RemoveDelivery(ctx context.Context, in *RemoveDeliveryRequest, opts ...grpc.CallOption) (*CartMutationReply, error)
+	ChangeQuantity(ctx context.Context, in *ChangeQuantityRequest, opts ...grpc.CallOption) (*CartMutationReply, error)
+	SetDelivery(ctx context.Context, in *SetDeliveryRequest, opts ...grpc.CallOption) (*CartMutationReply, error)
+	SetPickupPoint(ctx context.Context, in *SetPickupPointRequest, opts ...grpc.CallOption) (*CartMutationReply, error)
+	// (Checkout RPC removed - handled externally)
+	SetCartItems(ctx context.Context, in *SetCartItemsRequest, opts ...grpc.CallOption) (*CartMutationReply, error)
+	OrderCompleted(ctx context.Context, in *OrderCompletedRequest, opts ...grpc.CallOption) (*CartMutationReply, error)
+	GetState(ctx context.Context, in *StateRequest, opts ...grpc.CallOption) (*StateReply, error)
+}
+
+type cartActorClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewCartActorClient(cc grpc.ClientConnInterface) CartActorClient {
+	return &cartActorClient{cc}
+}
+
+func (c *cartActorClient) AddRequest(ctx context.Context, in *AddRequestRequest, opts ...grpc.CallOption) (*CartMutationReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CartMutationReply)
+	err := c.cc.Invoke(ctx, CartActor_AddRequest_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cartActorClient) AddItem(ctx context.Context, in *AddItemRequest, opts ...grpc.CallOption) (*CartMutationReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CartMutationReply)
+	err := c.cc.Invoke(ctx, CartActor_AddItem_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cartActorClient) RemoveItem(ctx context.Context, in *RemoveItemRequest, opts ...grpc.CallOption) (*CartMutationReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CartMutationReply)
+	err := c.cc.Invoke(ctx, CartActor_RemoveItem_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cartActorClient) RemoveDelivery(ctx context.Context, in *RemoveDeliveryRequest, opts ...grpc.CallOption) (*CartMutationReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CartMutationReply)
+	err := c.cc.Invoke(ctx, CartActor_RemoveDelivery_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cartActorClient) ChangeQuantity(ctx context.Context, in *ChangeQuantityRequest, opts ...grpc.CallOption) (*CartMutationReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CartMutationReply)
+	err := c.cc.Invoke(ctx, CartActor_ChangeQuantity_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cartActorClient) SetDelivery(ctx context.Context, in *SetDeliveryRequest, opts ...grpc.CallOption) (*CartMutationReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CartMutationReply)
+	err := c.cc.Invoke(ctx, CartActor_SetDelivery_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cartActorClient) SetPickupPoint(ctx context.Context, in *SetPickupPointRequest, opts ...grpc.CallOption) (*CartMutationReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CartMutationReply)
+	err := c.cc.Invoke(ctx, CartActor_SetPickupPoint_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cartActorClient) SetCartItems(ctx context.Context, in *SetCartItemsRequest, opts ...grpc.CallOption) (*CartMutationReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CartMutationReply)
+	err := c.cc.Invoke(ctx, CartActor_SetCartItems_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cartActorClient) OrderCompleted(ctx context.Context, in *OrderCompletedRequest, opts ...grpc.CallOption) (*CartMutationReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CartMutationReply)
+	err := c.cc.Invoke(ctx, CartActor_OrderCompleted_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *cartActorClient) GetState(ctx context.Context, in *StateRequest, opts ...grpc.CallOption) (*StateReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(StateReply)
+	err := c.cc.Invoke(ctx, CartActor_GetState_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// CartActorServer is the server API for CartActor service.
+// All implementations must embed UnimplementedCartActorServer
+// for forward compatibility.
+//
+// -----------------------------------------------------------------------------
+// Service definition (per-mutation RPCs + checkout)
+// -----------------------------------------------------------------------------
+type CartActorServer interface {
+	AddRequest(context.Context, *AddRequestRequest) (*CartMutationReply, error)
+	AddItem(context.Context, *AddItemRequest) (*CartMutationReply, error)
+	RemoveItem(context.Context, *RemoveItemRequest) (*CartMutationReply, error)
+	RemoveDelivery(context.Context, *RemoveDeliveryRequest) (*CartMutationReply, error)
+	ChangeQuantity(context.Context, *ChangeQuantityRequest) (*CartMutationReply, error)
+	SetDelivery(context.Context, *SetDeliveryRequest) (*CartMutationReply, error)
+	SetPickupPoint(context.Context, *SetPickupPointRequest) (*CartMutationReply, error)
+	// (Checkout RPC removed - handled externally)
+	SetCartItems(context.Context, *SetCartItemsRequest) (*CartMutationReply, error)
+	OrderCompleted(context.Context, *OrderCompletedRequest) (*CartMutationReply, error)
+	GetState(context.Context, *StateRequest) (*StateReply, error)
+	mustEmbedUnimplementedCartActorServer()
+}
+
+// UnimplementedCartActorServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedCartActorServer struct{}
+
+func (UnimplementedCartActorServer) AddRequest(context.Context, *AddRequestRequest) (*CartMutationReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method AddRequest not implemented")
+}
+func (UnimplementedCartActorServer) AddItem(context.Context, *AddItemRequest) (*CartMutationReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method AddItem not implemented")
+}
+func (UnimplementedCartActorServer) RemoveItem(context.Context, *RemoveItemRequest) (*CartMutationReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method RemoveItem not implemented")
+}
+func (UnimplementedCartActorServer) RemoveDelivery(context.Context, *RemoveDeliveryRequest) (*CartMutationReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method RemoveDelivery not implemented")
+}
+func (UnimplementedCartActorServer) ChangeQuantity(context.Context, *ChangeQuantityRequest) (*CartMutationReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ChangeQuantity not implemented")
+}
+func (UnimplementedCartActorServer) SetDelivery(context.Context, *SetDeliveryRequest) (*CartMutationReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method SetDelivery not implemented")
+}
+func (UnimplementedCartActorServer) SetPickupPoint(context.Context, *SetPickupPointRequest) (*CartMutationReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method SetPickupPoint not implemented")
+}
+func (UnimplementedCartActorServer) SetCartItems(context.Context, *SetCartItemsRequest) (*CartMutationReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method SetCartItems not implemented")
+}
+func (UnimplementedCartActorServer) OrderCompleted(context.Context, *OrderCompletedRequest) (*CartMutationReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method OrderCompleted not implemented")
+}
+func (UnimplementedCartActorServer) GetState(context.Context, *StateRequest) (*StateReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetState not implemented")
+}
+func (UnimplementedCartActorServer) mustEmbedUnimplementedCartActorServer() {}
+func (UnimplementedCartActorServer) testEmbeddedByValue()                   {}
+
+// UnsafeCartActorServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to CartActorServer will
+// result in compilation errors.
+type UnsafeCartActorServer interface {
+	mustEmbedUnimplementedCartActorServer()
+}
+
+func RegisterCartActorServer(s grpc.ServiceRegistrar, srv CartActorServer) {
+	// If the following call pancis, it indicates UnimplementedCartActorServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&CartActor_ServiceDesc, srv)
+}
+
+func _CartActor_AddRequest_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(AddRequestRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartActorServer).AddRequest(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartActor_AddRequest_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartActorServer).AddRequest(ctx, req.(*AddRequestRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CartActor_AddItem_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(AddItemRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartActorServer).AddItem(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartActor_AddItem_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartActorServer).AddItem(ctx, req.(*AddItemRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CartActor_RemoveItem_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(RemoveItemRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartActorServer).RemoveItem(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartActor_RemoveItem_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartActorServer).RemoveItem(ctx, req.(*RemoveItemRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CartActor_RemoveDelivery_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(RemoveDeliveryRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartActorServer).RemoveDelivery(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartActor_RemoveDelivery_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartActorServer).RemoveDelivery(ctx, req.(*RemoveDeliveryRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CartActor_ChangeQuantity_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ChangeQuantityRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartActorServer).ChangeQuantity(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartActor_ChangeQuantity_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartActorServer).ChangeQuantity(ctx, req.(*ChangeQuantityRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CartActor_SetDelivery_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(SetDeliveryRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartActorServer).SetDelivery(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartActor_SetDelivery_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartActorServer).SetDelivery(ctx, req.(*SetDeliveryRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CartActor_SetPickupPoint_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(SetPickupPointRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartActorServer).SetPickupPoint(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartActor_SetPickupPoint_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartActorServer).SetPickupPoint(ctx, req.(*SetPickupPointRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CartActor_SetCartItems_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(SetCartItemsRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartActorServer).SetCartItems(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartActor_SetCartItems_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartActorServer).SetCartItems(ctx, req.(*SetCartItemsRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CartActor_OrderCompleted_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(OrderCompletedRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartActorServer).OrderCompleted(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartActor_OrderCompleted_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartActorServer).OrderCompleted(ctx, req.(*OrderCompletedRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _CartActor_GetState_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(StateRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CartActorServer).GetState(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: CartActor_GetState_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CartActorServer).GetState(ctx, req.(*StateRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// CartActor_ServiceDesc is the grpc.ServiceDesc for CartActor service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var CartActor_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "messages.CartActor",
+	HandlerType: (*CartActorServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "AddRequest",
+			Handler:    _CartActor_AddRequest_Handler,
+		},
+		{
+			MethodName: "AddItem",
+			Handler:    _CartActor_AddItem_Handler,
+		},
+		{
+			MethodName: "RemoveItem",
+			Handler:    _CartActor_RemoveItem_Handler,
+		},
+		{
+			MethodName: "RemoveDelivery",
+			Handler:    _CartActor_RemoveDelivery_Handler,
+		},
+		{
+			MethodName: "ChangeQuantity",
+			Handler:    _CartActor_ChangeQuantity_Handler,
+		},
+		{
+			MethodName: "SetDelivery",
+			Handler:    _CartActor_SetDelivery_Handler,
+		},
+		{
+			MethodName: "SetPickupPoint",
+			Handler:    _CartActor_SetPickupPoint_Handler,
+		},
+		{
+			MethodName: "SetCartItems",
+			Handler:    _CartActor_SetCartItems_Handler,
+		},
+		{
+			MethodName: "OrderCompleted",
+			Handler:    _CartActor_OrderCompleted_Handler,
+		},
+		{
+			MethodName: "GetState",
+			Handler:    _CartActor_GetState_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "cart_actor.proto",
+}

proto/control_plane.pb.go

@@ -0,0 +1,495 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.36.10
+// 	protoc        v3.21.12
+// source: control_plane.proto
+
+package messages
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+	unsafe "unsafe"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// Empty request placeholder (common pattern).
+type Empty struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Empty) Reset() {
+	*x = Empty{}
+	mi := &file_control_plane_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Empty) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Empty) ProtoMessage() {}
+
+func (x *Empty) ProtoReflect() protoreflect.Message {
+	mi := &file_control_plane_proto_msgTypes[0]
+	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 Empty.ProtoReflect.Descriptor instead.
+func (*Empty) Descriptor() ([]byte, []int) {
+	return file_control_plane_proto_rawDescGZIP(), []int{0}
+}
+
+// Ping reply includes responding host and its current unix time (seconds).
+type PingReply struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Host          string                 `protobuf:"bytes,1,opt,name=host,proto3" json:"host,omitempty"`
+	UnixTime      int64                  `protobuf:"varint,2,opt,name=unix_time,json=unixTime,proto3" json:"unix_time,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *PingReply) Reset() {
+	*x = PingReply{}
+	mi := &file_control_plane_proto_msgTypes[1]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *PingReply) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PingReply) ProtoMessage() {}
+
+func (x *PingReply) ProtoReflect() protoreflect.Message {
+	mi := &file_control_plane_proto_msgTypes[1]
+	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 PingReply.ProtoReflect.Descriptor instead.
+func (*PingReply) Descriptor() ([]byte, []int) {
+	return file_control_plane_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *PingReply) GetHost() string {
+	if x != nil {
+		return x.Host
+	}
+	return ""
+}
+
+func (x *PingReply) GetUnixTime() int64 {
+	if x != nil {
+		return x.UnixTime
+	}
+	return 0
+}
+
+// NegotiateRequest carries the caller's full view of known hosts (including self).
+type NegotiateRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	KnownHosts    []string               `protobuf:"bytes,1,rep,name=known_hosts,json=knownHosts,proto3" json:"known_hosts,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *NegotiateRequest) Reset() {
+	*x = NegotiateRequest{}
+	mi := &file_control_plane_proto_msgTypes[2]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *NegotiateRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*NegotiateRequest) ProtoMessage() {}
+
+func (x *NegotiateRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_control_plane_proto_msgTypes[2]
+	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 NegotiateRequest.ProtoReflect.Descriptor instead.
+func (*NegotiateRequest) Descriptor() ([]byte, []int) {
+	return file_control_plane_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *NegotiateRequest) GetKnownHosts() []string {
+	if x != nil {
+		return x.KnownHosts
+	}
+	return nil
+}
+
+// NegotiateReply returns the callee's healthy hosts (including itself).
+type NegotiateReply struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Hosts         []string               `protobuf:"bytes,1,rep,name=hosts,proto3" json:"hosts,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *NegotiateReply) Reset() {
+	*x = NegotiateReply{}
+	mi := &file_control_plane_proto_msgTypes[3]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *NegotiateReply) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*NegotiateReply) ProtoMessage() {}
+
+func (x *NegotiateReply) ProtoReflect() protoreflect.Message {
+	mi := &file_control_plane_proto_msgTypes[3]
+	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 NegotiateReply.ProtoReflect.Descriptor instead.
+func (*NegotiateReply) Descriptor() ([]byte, []int) {
+	return file_control_plane_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *NegotiateReply) GetHosts() []string {
+	if x != nil {
+		return x.Hosts
+	}
+	return nil
+}
+
+// CartIdsReply returns the list of cart IDs (string form) currently owned locally.
+type CartIdsReply struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	CartIds       []string               `protobuf:"bytes,1,rep,name=cart_ids,json=cartIds,proto3" json:"cart_ids,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *CartIdsReply) Reset() {
+	*x = CartIdsReply{}
+	mi := &file_control_plane_proto_msgTypes[4]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *CartIdsReply) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CartIdsReply) ProtoMessage() {}
+
+func (x *CartIdsReply) ProtoReflect() protoreflect.Message {
+	mi := &file_control_plane_proto_msgTypes[4]
+	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 CartIdsReply.ProtoReflect.Descriptor instead.
+func (*CartIdsReply) Descriptor() ([]byte, []int) {
+	return file_control_plane_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *CartIdsReply) GetCartIds() []string {
+	if x != nil {
+		return x.CartIds
+	}
+	return nil
+}
+
+// OwnerChangeRequest notifies peers that ownership of a cart moved (or is moving) to new_host.
+type OwnerChangeRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	CartId        string                 `protobuf:"bytes,1,opt,name=cart_id,json=cartId,proto3" json:"cart_id,omitempty"`
+	NewHost       string                 `protobuf:"bytes,2,opt,name=new_host,json=newHost,proto3" json:"new_host,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *OwnerChangeRequest) Reset() {
+	*x = OwnerChangeRequest{}
+	mi := &file_control_plane_proto_msgTypes[5]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *OwnerChangeRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*OwnerChangeRequest) ProtoMessage() {}
+
+func (x *OwnerChangeRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_control_plane_proto_msgTypes[5]
+	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 OwnerChangeRequest.ProtoReflect.Descriptor instead.
+func (*OwnerChangeRequest) Descriptor() ([]byte, []int) {
+	return file_control_plane_proto_rawDescGZIP(), []int{5}
+}
+
+func (x *OwnerChangeRequest) GetCartId() string {
+	if x != nil {
+		return x.CartId
+	}
+	return ""
+}
+
+func (x *OwnerChangeRequest) GetNewHost() string {
+	if x != nil {
+		return x.NewHost
+	}
+	return ""
+}
+
+// OwnerChangeAck indicates acceptance or rejection of an ownership change.
+type OwnerChangeAck struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Accepted      bool                   `protobuf:"varint,1,opt,name=accepted,proto3" json:"accepted,omitempty"`
+	Message       string                 `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *OwnerChangeAck) Reset() {
+	*x = OwnerChangeAck{}
+	mi := &file_control_plane_proto_msgTypes[6]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *OwnerChangeAck) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*OwnerChangeAck) ProtoMessage() {}
+
+func (x *OwnerChangeAck) ProtoReflect() protoreflect.Message {
+	mi := &file_control_plane_proto_msgTypes[6]
+	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 OwnerChangeAck.ProtoReflect.Descriptor instead.
+func (*OwnerChangeAck) Descriptor() ([]byte, []int) {
+	return file_control_plane_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *OwnerChangeAck) GetAccepted() bool {
+	if x != nil {
+		return x.Accepted
+	}
+	return false
+}
+
+func (x *OwnerChangeAck) GetMessage() string {
+	if x != nil {
+		return x.Message
+	}
+	return ""
+}
+
+// ClosingNotice notifies peers this host is terminating (so they can drop / re-resolve).
+type ClosingNotice struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Host          string                 `protobuf:"bytes,1,opt,name=host,proto3" json:"host,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ClosingNotice) Reset() {
+	*x = ClosingNotice{}
+	mi := &file_control_plane_proto_msgTypes[7]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ClosingNotice) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ClosingNotice) ProtoMessage() {}
+
+func (x *ClosingNotice) ProtoReflect() protoreflect.Message {
+	mi := &file_control_plane_proto_msgTypes[7]
+	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 ClosingNotice.ProtoReflect.Descriptor instead.
+func (*ClosingNotice) Descriptor() ([]byte, []int) {
+	return file_control_plane_proto_rawDescGZIP(), []int{7}
+}
+
+func (x *ClosingNotice) GetHost() string {
+	if x != nil {
+		return x.Host
+	}
+	return ""
+}
+
+var File_control_plane_proto protoreflect.FileDescriptor
+
+const file_control_plane_proto_rawDesc = "" +
+	"\n" +
+	"\x13control_plane.proto\x12\bmessages\"\a\n" +
+	"\x05Empty\"<\n" +
+	"\tPingReply\x12\x12\n" +
+	"\x04host\x18\x01 \x01(\tR\x04host\x12\x1b\n" +
+	"\tunix_time\x18\x02 \x01(\x03R\bunixTime\"3\n" +
+	"\x10NegotiateRequest\x12\x1f\n" +
+	"\vknown_hosts\x18\x01 \x03(\tR\n" +
+	"knownHosts\"&\n" +
+	"\x0eNegotiateReply\x12\x14\n" +
+	"\x05hosts\x18\x01 \x03(\tR\x05hosts\")\n" +
+	"\fCartIdsReply\x12\x19\n" +
+	"\bcart_ids\x18\x01 \x03(\tR\acartIds\"H\n" +
+	"\x12OwnerChangeRequest\x12\x17\n" +
+	"\acart_id\x18\x01 \x01(\tR\x06cartId\x12\x19\n" +
+	"\bnew_host\x18\x02 \x01(\tR\anewHost\"F\n" +
+	"\x0eOwnerChangeAck\x12\x1a\n" +
+	"\baccepted\x18\x01 \x01(\bR\baccepted\x12\x18\n" +
+	"\amessage\x18\x02 \x01(\tR\amessage\"#\n" +
+	"\rClosingNotice\x12\x12\n" +
+	"\x04host\x18\x01 \x01(\tR\x04host2\xbc\x02\n" +
+	"\fControlPlane\x12,\n" +
+	"\x04Ping\x12\x0f.messages.Empty\x1a\x13.messages.PingReply\x12A\n" +
+	"\tNegotiate\x12\x1a.messages.NegotiateRequest\x1a\x18.messages.NegotiateReply\x125\n" +
+	"\n" +
+	"GetCartIds\x12\x0f.messages.Empty\x1a\x16.messages.CartIdsReply\x12F\n" +
+	"\fConfirmOwner\x12\x1c.messages.OwnerChangeRequest\x1a\x18.messages.OwnerChangeAck\x12<\n" +
+	"\aClosing\x12\x17.messages.ClosingNotice\x1a\x18.messages.OwnerChangeAckB.Z,git.tornberg.me/go-cart-actor/proto;messagesb\x06proto3"
+
+var (
+	file_control_plane_proto_rawDescOnce sync.Once
+	file_control_plane_proto_rawDescData []byte
+)
+
+func file_control_plane_proto_rawDescGZIP() []byte {
+	file_control_plane_proto_rawDescOnce.Do(func() {
+		file_control_plane_proto_rawDescData = protoimpl.X.CompressGZIP(unsafe.Slice(unsafe.StringData(file_control_plane_proto_rawDesc), len(file_control_plane_proto_rawDesc)))
+	})
+	return file_control_plane_proto_rawDescData
+}
+
+var file_control_plane_proto_msgTypes = make([]protoimpl.MessageInfo, 8)
+var file_control_plane_proto_goTypes = []any{
+	(*Empty)(nil),              // 0: messages.Empty
+	(*PingReply)(nil),          // 1: messages.PingReply
+	(*NegotiateRequest)(nil),   // 2: messages.NegotiateRequest
+	(*NegotiateReply)(nil),     // 3: messages.NegotiateReply
+	(*CartIdsReply)(nil),       // 4: messages.CartIdsReply
+	(*OwnerChangeRequest)(nil), // 5: messages.OwnerChangeRequest
+	(*OwnerChangeAck)(nil),     // 6: messages.OwnerChangeAck
+	(*ClosingNotice)(nil),      // 7: messages.ClosingNotice
+}
+var file_control_plane_proto_depIdxs = []int32{
+	0, // 0: messages.ControlPlane.Ping:input_type -> messages.Empty
+	2, // 1: messages.ControlPlane.Negotiate:input_type -> messages.NegotiateRequest
+	0, // 2: messages.ControlPlane.GetCartIds:input_type -> messages.Empty
+	5, // 3: messages.ControlPlane.ConfirmOwner:input_type -> messages.OwnerChangeRequest
+	7, // 4: messages.ControlPlane.Closing:input_type -> messages.ClosingNotice
+	1, // 5: messages.ControlPlane.Ping:output_type -> messages.PingReply
+	3, // 6: messages.ControlPlane.Negotiate:output_type -> messages.NegotiateReply
+	4, // 7: messages.ControlPlane.GetCartIds:output_type -> messages.CartIdsReply
+	6, // 8: messages.ControlPlane.ConfirmOwner:output_type -> messages.OwnerChangeAck
+	6, // 9: messages.ControlPlane.Closing:output_type -> messages.OwnerChangeAck
+	5, // [5:10] is the sub-list for method output_type
+	0, // [0:5] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_control_plane_proto_init() }
+func file_control_plane_proto_init() {
+	if File_control_plane_proto != nil {
+		return
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: unsafe.Slice(unsafe.StringData(file_control_plane_proto_rawDesc), len(file_control_plane_proto_rawDesc)),
+			NumEnums:      0,
+			NumMessages:   8,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_control_plane_proto_goTypes,
+		DependencyIndexes: file_control_plane_proto_depIdxs,
+		MessageInfos:      file_control_plane_proto_msgTypes,
+	}.Build()
+	File_control_plane_proto = out.File
+	file_control_plane_proto_goTypes = nil
+	file_control_plane_proto_depIdxs = nil
+}

proto/control_plane.proto

@@ -0,0 +1,89 @@
+syntax = "proto3";
+
+package messages;
+
+option go_package = "git.tornberg.me/go-cart-actor/proto;messages";
+
+// -----------------------------------------------------------------------------
+// Control Plane gRPC API
+// -----------------------------------------------------------------------------
+// Replaces the legacy custom frame-based control channel (previously port 1338).
+// Responsibilities:
+//   - Liveness (Ping)
+//   - Membership negotiation (Negotiate)
+//   - Cart ownership change propagation (ConfirmOwner)
+//   - Cart ID listing for remote grain spawning (GetCartIds)
+//   - Graceful shutdown notifications (Closing)
+// No authentication / TLS is defined initially (can be added later).
+// -----------------------------------------------------------------------------
+
+// Empty request placeholder (common pattern).
+message Empty {}
+
+// Ping reply includes responding host and its current unix time (seconds).
+message PingReply {
+  string host = 1;
+  int64 unix_time = 2;
+}
+
+// NegotiateRequest carries the caller's full view of known hosts (including self).
+message NegotiateRequest {
+  repeated string known_hosts = 1;
+}
+
+// NegotiateReply returns the callee's healthy hosts (including itself).
+message NegotiateReply {
+  repeated string hosts = 1;
+}
+
+// CartIdsReply returns the list of cart IDs (string form) currently owned locally.
+message CartIdsReply {
+  repeated string cart_ids = 1;
+}
+
+// OwnerChangeRequest notifies peers that ownership of a cart moved (or is moving) to new_host.
+message OwnerChangeRequest {
+  string cart_id = 1;
+  string new_host = 2;
+}
+
+// OwnerChangeAck indicates acceptance or rejection of an ownership change.
+message OwnerChangeAck {
+  bool accepted = 1;
+  string message = 2;
+}
+
+// ClosingNotice notifies peers this host is terminating (so they can drop / re-resolve).
+message ClosingNotice {
+  string host = 1;
+}
+
+// ControlPlane defines cluster coordination and ownership operations.
+service ControlPlane {
+  // Ping for liveness; lightweight health signal.
+  rpc Ping(Empty) returns (PingReply);
+
+  // Negotiate merges host views; used during discovery & convergence.
+  rpc Negotiate(NegotiateRequest) returns (NegotiateReply);
+
+  // GetCartIds lists currently owned cart IDs on this node.
+  rpc GetCartIds(Empty) returns (CartIdsReply);
+
+  // ConfirmOwner announces/asks peers to acknowledge ownership transfer.
+  rpc ConfirmOwner(OwnerChangeRequest) returns (OwnerChangeAck);
+
+  // Closing announces graceful shutdown so peers can proactively adjust.
+  rpc Closing(ClosingNotice) returns (OwnerChangeAck);
+}
+
+// -----------------------------------------------------------------------------
+// Generation Instructions:
+// protoc --go_out=. --go_opt=paths=source_relative \
+//        --go-grpc_out=. --go-grpc_opt=paths=source_relative \
+//        control_plane.proto
+//
+// Future Enhancements:
+//  - Add a streaming membership watch (server -> client) for immediate updates.
+//  - Add TLS / mTLS for secure intra-cluster communication.
+//  - Add richer health metadata (load, grain count) in PingReply.
+// -----------------------------------------------------------------------------

proto/control_plane_grpc.pb.go

@@ -0,0 +1,287 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.5.1
+// - protoc             v3.21.12
+// source: control_plane.proto
+
+package messages
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.64.0 or later.
+const _ = grpc.SupportPackageIsVersion9
+
+const (
+	ControlPlane_Ping_FullMethodName         = "/messages.ControlPlane/Ping"
+	ControlPlane_Negotiate_FullMethodName    = "/messages.ControlPlane/Negotiate"
+	ControlPlane_GetCartIds_FullMethodName   = "/messages.ControlPlane/GetCartIds"
+	ControlPlane_ConfirmOwner_FullMethodName = "/messages.ControlPlane/ConfirmOwner"
+	ControlPlane_Closing_FullMethodName      = "/messages.ControlPlane/Closing"
+)
+
+// ControlPlaneClient is the client API for ControlPlane service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+//
+// ControlPlane defines cluster coordination and ownership operations.
+type ControlPlaneClient interface {
+	// Ping for liveness; lightweight health signal.
+	Ping(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*PingReply, error)
+	// Negotiate merges host views; used during discovery & convergence.
+	Negotiate(ctx context.Context, in *NegotiateRequest, opts ...grpc.CallOption) (*NegotiateReply, error)
+	// GetCartIds lists currently owned cart IDs on this node.
+	GetCartIds(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*CartIdsReply, error)
+	// ConfirmOwner announces/asks peers to acknowledge ownership transfer.
+	ConfirmOwner(ctx context.Context, in *OwnerChangeRequest, opts ...grpc.CallOption) (*OwnerChangeAck, error)
+	// Closing announces graceful shutdown so peers can proactively adjust.
+	Closing(ctx context.Context, in *ClosingNotice, opts ...grpc.CallOption) (*OwnerChangeAck, error)
+}
+
+type controlPlaneClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewControlPlaneClient(cc grpc.ClientConnInterface) ControlPlaneClient {
+	return &controlPlaneClient{cc}
+}
+
+func (c *controlPlaneClient) Ping(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*PingReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(PingReply)
+	err := c.cc.Invoke(ctx, ControlPlane_Ping_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *controlPlaneClient) Negotiate(ctx context.Context, in *NegotiateRequest, opts ...grpc.CallOption) (*NegotiateReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(NegotiateReply)
+	err := c.cc.Invoke(ctx, ControlPlane_Negotiate_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *controlPlaneClient) GetCartIds(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*CartIdsReply, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(CartIdsReply)
+	err := c.cc.Invoke(ctx, ControlPlane_GetCartIds_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *controlPlaneClient) ConfirmOwner(ctx context.Context, in *OwnerChangeRequest, opts ...grpc.CallOption) (*OwnerChangeAck, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(OwnerChangeAck)
+	err := c.cc.Invoke(ctx, ControlPlane_ConfirmOwner_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *controlPlaneClient) Closing(ctx context.Context, in *ClosingNotice, opts ...grpc.CallOption) (*OwnerChangeAck, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(OwnerChangeAck)
+	err := c.cc.Invoke(ctx, ControlPlane_Closing_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// ControlPlaneServer is the server API for ControlPlane service.
+// All implementations must embed UnimplementedControlPlaneServer
+// for forward compatibility.
+//
+// ControlPlane defines cluster coordination and ownership operations.
+type ControlPlaneServer interface {
+	// Ping for liveness; lightweight health signal.
+	Ping(context.Context, *Empty) (*PingReply, error)
+	// Negotiate merges host views; used during discovery & convergence.
+	Negotiate(context.Context, *NegotiateRequest) (*NegotiateReply, error)
+	// GetCartIds lists currently owned cart IDs on this node.
+	GetCartIds(context.Context, *Empty) (*CartIdsReply, error)
+	// ConfirmOwner announces/asks peers to acknowledge ownership transfer.
+	ConfirmOwner(context.Context, *OwnerChangeRequest) (*OwnerChangeAck, error)
+	// Closing announces graceful shutdown so peers can proactively adjust.
+	Closing(context.Context, *ClosingNotice) (*OwnerChangeAck, error)
+	mustEmbedUnimplementedControlPlaneServer()
+}
+
+// UnimplementedControlPlaneServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedControlPlaneServer struct{}
+
+func (UnimplementedControlPlaneServer) Ping(context.Context, *Empty) (*PingReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Ping not implemented")
+}
+func (UnimplementedControlPlaneServer) Negotiate(context.Context, *NegotiateRequest) (*NegotiateReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Negotiate not implemented")
+}
+func (UnimplementedControlPlaneServer) GetCartIds(context.Context, *Empty) (*CartIdsReply, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetCartIds not implemented")
+}
+func (UnimplementedControlPlaneServer) ConfirmOwner(context.Context, *OwnerChangeRequest) (*OwnerChangeAck, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ConfirmOwner not implemented")
+}
+func (UnimplementedControlPlaneServer) Closing(context.Context, *ClosingNotice) (*OwnerChangeAck, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Closing not implemented")
+}
+func (UnimplementedControlPlaneServer) mustEmbedUnimplementedControlPlaneServer() {}
+func (UnimplementedControlPlaneServer) testEmbeddedByValue()                      {}
+
+// UnsafeControlPlaneServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to ControlPlaneServer will
+// result in compilation errors.
+type UnsafeControlPlaneServer interface {
+	mustEmbedUnimplementedControlPlaneServer()
+}
+
+func RegisterControlPlaneServer(s grpc.ServiceRegistrar, srv ControlPlaneServer) {
+	// If the following call pancis, it indicates UnimplementedControlPlaneServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&ControlPlane_ServiceDesc, srv)
+}
+
+func _ControlPlane_Ping_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Empty)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ControlPlaneServer).Ping(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ControlPlane_Ping_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ControlPlaneServer).Ping(ctx, req.(*Empty))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _ControlPlane_Negotiate_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(NegotiateRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ControlPlaneServer).Negotiate(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ControlPlane_Negotiate_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ControlPlaneServer).Negotiate(ctx, req.(*NegotiateRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _ControlPlane_GetCartIds_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Empty)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ControlPlaneServer).GetCartIds(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ControlPlane_GetCartIds_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ControlPlaneServer).GetCartIds(ctx, req.(*Empty))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _ControlPlane_ConfirmOwner_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(OwnerChangeRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ControlPlaneServer).ConfirmOwner(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ControlPlane_ConfirmOwner_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ControlPlaneServer).ConfirmOwner(ctx, req.(*OwnerChangeRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _ControlPlane_Closing_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ClosingNotice)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ControlPlaneServer).Closing(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ControlPlane_Closing_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ControlPlaneServer).Closing(ctx, req.(*ClosingNotice))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+// ControlPlane_ServiceDesc is the grpc.ServiceDesc for ControlPlane service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var ControlPlane_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "messages.ControlPlane",
+	HandlerType: (*ControlPlaneServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Ping",
+			Handler:    _ControlPlane_Ping_Handler,
+		},
+		{
+			MethodName: "Negotiate",
+			Handler:    _ControlPlane_Negotiate_Handler,
+		},
+		{
+			MethodName: "GetCartIds",
+			Handler:    _ControlPlane_GetCartIds_Handler,
+		},
+		{
+			MethodName: "ConfirmOwner",
+			Handler:    _ControlPlane_ConfirmOwner_Handler,
+		},
+		{
+			MethodName: "Closing",
+			Handler:    _ControlPlane_Closing_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "control_plane.proto",
+}

proto/messages.pb.go

@@ -889,6 +889,102 @@ func (x *OrderCreated) GetStatus() string {
 	return ""
 }
 
+type Noop struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Noop) Reset() {
+	*x = Noop{}
+	mi := &file_messages_proto_msgTypes[11]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Noop) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Noop) ProtoMessage() {}
+
+func (x *Noop) ProtoReflect() protoreflect.Message {
+	mi := &file_messages_proto_msgTypes[11]
+	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 Noop.ProtoReflect.Descriptor instead.
+func (*Noop) Descriptor() ([]byte, []int) {
+	return file_messages_proto_rawDescGZIP(), []int{11}
+}
+
+type InitializeCheckout struct {
+	state             protoimpl.MessageState `protogen:"open.v1"`
+	OrderId           string                 `protobuf:"bytes,1,opt,name=orderId,proto3" json:"orderId,omitempty"`
+	Status            string                 `protobuf:"bytes,2,opt,name=status,proto3" json:"status,omitempty"`
+	PaymentInProgress bool                   `protobuf:"varint,3,opt,name=paymentInProgress,proto3" json:"paymentInProgress,omitempty"`
+	unknownFields     protoimpl.UnknownFields
+	sizeCache         protoimpl.SizeCache
+}
+
+func (x *InitializeCheckout) Reset() {
+	*x = InitializeCheckout{}
+	mi := &file_messages_proto_msgTypes[12]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *InitializeCheckout) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*InitializeCheckout) ProtoMessage() {}
+
+func (x *InitializeCheckout) ProtoReflect() protoreflect.Message {
+	mi := &file_messages_proto_msgTypes[12]
+	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 InitializeCheckout.ProtoReflect.Descriptor instead.
+func (*InitializeCheckout) Descriptor() ([]byte, []int) {
+	return file_messages_proto_rawDescGZIP(), []int{12}
+}
+
+func (x *InitializeCheckout) GetOrderId() string {
+	if x != nil {
+		return x.OrderId
+	}
+	return ""
+}
+
+func (x *InitializeCheckout) GetStatus() string {
+	if x != nil {
+		return x.Status
+	}
+	return ""
+}
+
+func (x *InitializeCheckout) GetPaymentInProgress() bool {
+	if x != nil {
+		return x.PaymentInProgress
+	}
+	return false
+}
+
 var File_messages_proto protoreflect.FileDescriptor
 
 const file_messages_proto_rawDesc = "" +
@@ -997,8 +1093,12 @@ const file_messages_proto_rawDesc = "" +
 	"\acountry\x18\x06 \x01(\tR\acountry\"@\n" +
 	"\fOrderCreated\x12\x18\n" +
 	"\aorderId\x18\x01 \x01(\tR\aorderId\x12\x16\n" +
-	"\x06status\x18\x02 \x01(\tR\x06statusB\fZ\n" +
-	".;messagesb\x06proto3"
+	"\x06status\x18\x02 \x01(\tR\x06status\"\x06\n" +
+	"\x04Noop\"t\n" +
+	"\x12InitializeCheckout\x12\x18\n" +
+	"\aorderId\x18\x01 \x01(\tR\aorderId\x12\x16\n" +
+	"\x06status\x18\x02 \x01(\tR\x06status\x12,\n" +
+	"\x11paymentInProgress\x18\x03 \x01(\bR\x11paymentInProgressB.Z,git.tornberg.me/go-cart-actor/proto;messagesb\x06proto3"
 
 var (
 	file_messages_proto_rawDescOnce sync.Once
@@ -1012,7 +1112,7 @@ func file_messages_proto_rawDescGZIP() []byte {
 	return file_messages_proto_rawDescData
 }
 
-var file_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 11)
+var file_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 13)
 var file_messages_proto_goTypes = []any{
 	(*AddRequest)(nil),          // 0: messages.AddRequest
 	(*SetCartRequest)(nil),      // 1: messages.SetCartRequest
@@ -1025,6 +1125,8 @@ var file_messages_proto_goTypes = []any{
 	(*RemoveDelivery)(nil),      // 8: messages.RemoveDelivery
 	(*CreateCheckoutOrder)(nil), // 9: messages.CreateCheckoutOrder
 	(*OrderCreated)(nil),        // 10: messages.OrderCreated
+	(*Noop)(nil),                // 11: messages.Noop
+	(*InitializeCheckout)(nil),  // 12: messages.InitializeCheckout
 }
 var file_messages_proto_depIdxs = []int32{
 	0, // 0: messages.SetCartRequest.items:type_name -> messages.AddRequest
@@ -1052,7 +1154,7 @@ func file_messages_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: unsafe.Slice(unsafe.StringData(file_messages_proto_rawDesc), len(file_messages_proto_rawDesc)),
 			NumEnums:      0,
-			NumMessages:   11,
+			NumMessages:   13,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

proto/messages.proto

@@ -1,6 +1,6 @@
 syntax = "proto3";
 package messages;
-option go_package = ".;messages";
+option go_package = "git.tornberg.me/go-cart-actor/proto;messages";
 
 message AddRequest {
 		int32 quantity = 1;
@@ -93,3 +93,13 @@ message OrderCreated {
 		string orderId = 1;
 		string status = 2;
 }
+
+message Noop {
+		// Intentionally empty - used for ownership acquisition or health pings
+}
+
+message InitializeCheckout {
+        string orderId = 1;
+        string status = 2;
+        bool paymentInProgress = 3;
+}

remote-grain-pool._go

@@ -1,67 +0,0 @@
-// package main
-
-// import "sync"
-
-// type RemoteGrainPool struct {
-// 	mu     sync.RWMutex
-// 	Host   string
-// 	grains map[CartId]*RemoteGrain
-// }
-
-// func NewRemoteGrainPool(addr string) *RemoteGrainPool {
-// 	return &RemoteGrainPool{
-// 		Host:   addr,
-// 		grains: make(map[CartId]*RemoteGrain),
-// 	}
-// }
-
-// func (p *RemoteGrainPool) findRemoteGrain(id CartId) *RemoteGrain {
-// 	p.mu.RLock()
-// 	grain, ok := p.grains[id]
-// 	p.mu.RUnlock()
-// 	if !ok {
-// 		return nil
-// 	}
-// 	return grain
-// }
-
-// func (p *RemoteGrainPool) findOrCreateGrain(id CartId) (*RemoteGrain, error) {
-// 	grain := p.findRemoteGrain(id)
-
-// 	if grain == nil {
-// 		grain, err := NewRemoteGrain(id, p.Host)
-// 		if err != nil {
-// 			return nil, err
-// 		}
-// 		p.mu.Lock()
-// 		p.grains[id] = grain
-// 		p.mu.Unlock()
-// 	}
-// 	return grain, nil
-// }
-
-// func (p *RemoteGrainPool) Delete(id CartId) {
-// 	p.mu.Lock()
-// 	delete(p.grains, id)
-// 	p.mu.Unlock()
-// }
-
-// func (p *RemoteGrainPool) Process(id CartId, messages ...Message) (*FrameWithPayload, error) {
-// 	var result *FrameWithPayload
-// 	grain, err := p.findOrCreateGrain(id)
-// 	if err != nil {
-// 		return nil, err
-// 	}
-// 	for _, message := range messages {
-// 		result, err = grain.HandleMessage(&message, false)
-// 	}
-// 	return result, err
-// }
-
-// func (p *RemoteGrainPool) Get(id CartId) (*FrameWithPayload, error) {
-// 	grain, err := p.findOrCreateGrain(id)
-// 	if err != nil {
-// 		return nil, err
-// 	}
-// 	return grain.GetCurrentState()
-// }

remote-grain.go

@@ -1,72 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"strings"
-
-	"github.com/yudhasubki/netpool"
-)
-
-func (id CartId) String() string {
-	return strings.Trim(string(id[:]), "\x00")
-}
-
-type CartIdPayload struct {
-	Id   CartId
-	Data []byte
-}
-
-func MakeCartInnerFrame(id CartId, payload []byte) []byte {
-	if payload == nil {
-		return id[:]
-	}
-	return append(id[:], payload...)
-}
-
-func GetCartFrame(data []byte) (*CartIdPayload, error) {
-	if len(data) < 16 {
-		return nil, fmt.Errorf("data too short")
-	}
-	return &CartIdPayload{
-		Id:   CartId(data[:16]),
-		Data: data[16:],
-	}, nil
-}
-
-func ToCartId(id string) CartId {
-	var result [16]byte
-	copy(result[:], []byte(id))
-	return result
-}
-
-type RemoteGrain struct {
-	*Connection
-	Id   CartId
-	Host string
-}
-
-func NewRemoteGrain(id CartId, host string, pool netpool.Netpooler) *RemoteGrain {
-	addr := fmt.Sprintf("%s:1337", host)
-	return &RemoteGrain{
-		Id:         id,
-		Host:       host,
-		Connection: NewConnection(addr, pool),
-	}
-}
-
-func (g *RemoteGrain) HandleMessage(message *Message, isReplay bool) (*FrameWithPayload, error) {
-
-	data, err := GetData(message.Write)
-	if err != nil {
-		return nil, err
-	}
-	return g.Call(RemoteHandleMutation, MakeCartInnerFrame(g.Id, data))
-}
-
-func (g *RemoteGrain) GetId() CartId {
-	return g.Id
-}
-
-func (g *RemoteGrain) GetCurrentState() (*FrameWithPayload, error) {
-	return g.Call(RemoteGetState, MakeCartInnerFrame(g.Id, nil))
-}

remote-grain_test.go

@@ -1,17 +0,0 @@
-package main
-
-import "testing"
-
-func TestCartIdsNullData(t *testing.T) {
-	data := MakeCartInnerFrame(ToCartId("kalle"), nil)
-	cart, err := GetCartFrame(data)
-	if err != nil {
-		t.Errorf("Error getting cart: %v", err)
-	}
-	if cart.Id.String() != "kalle" {
-		t.Errorf("Expected kalle, got %s", cart.Id)
-	}
-	if len(cart.Data) != 0 {
-		t.Errorf("Expected no data, got %v", cart.Data)
-	}
-}

remote-host.go

@@ -1,93 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"log"
-	"strings"
-
-	"github.com/yudhasubki/netpool"
-)
-
-type RemoteHost struct {
-	*Connection
-	HostPool    netpool.Netpooler
-	Host        string
-	MissedPings int
-}
-
-func (h *RemoteHost) IsHealthy() bool {
-	return h.MissedPings < 3
-}
-
-func (h *RemoteHost) Initialize(p *SyncedPool) {
-	log.Printf("Initializing remote %s\n", h.Host)
-	ids, err := h.GetCartMappings()
-	if err != nil {
-		log.Printf("Error getting remote mappings: %v\n", err)
-		return
-	}
-	log.Printf("Remote %s has %d grains\n", h.Host, len(ids))
-
-	local := 0
-	remoteNo := 0
-	for _, id := range ids {
-		go p.SpawnRemoteGrain(id, h.Host)
-		remoteNo++
-	}
-	log.Printf("Removed %d local grains, added %d remote grains\n", local, remoteNo)
-
-	go p.Negotiate()
-
-}
-
-func (h *RemoteHost) Ping() error {
-	result, err := h.Call(Ping, nil)
-
-	if err != nil || result.StatusCode != 200 || result.Type != Pong {
-		h.MissedPings++
-		log.Printf("Error pinging remote %s, missed pings: %d", h.Host, h.MissedPings)
-	} else {
-		h.MissedPings = 0
-	}
-	return err
-}
-
-func (h *RemoteHost) Negotiate(knownHosts []string) ([]string, error) {
-	reply, err := h.Call(RemoteNegotiate, []byte(strings.Join(knownHosts, ";")))
-
-	if err != nil {
-		return nil, err
-	}
-	if reply.StatusCode != 200 {
-		return nil, fmt.Errorf("remote returned error on negotiate: %s", string(reply.Payload))
-	}
-
-	return strings.Split(string(reply.Payload), ";"), nil
-}
-
-func (g *RemoteHost) GetCartMappings() ([]CartId, error) {
-	reply, err := g.Call(GetCartIds, []byte{})
-	if err != nil {
-		return nil, err
-	}
-	if reply.StatusCode != 200 || reply.Type != CartIdsResponse {
-		log.Printf("Remote returned error on get cart mappings: %s", string(reply.Payload))
-		return nil, fmt.Errorf("remote returned incorrect data")
-	}
-	parts := strings.Split(string(reply.Payload), ";")
-	ids := make([]CartId, 0, len(parts))
-	for _, p := range parts {
-		ids = append(ids, ToCartId(p))
-	}
-	return ids, nil
-}
-
-func (r *RemoteHost) ConfirmChange(id CartId, host string) error {
-	reply, err := r.Call(RemoteGrainChanged, []byte(fmt.Sprintf("%s;%s", id, host)))
-
-	if err != nil || reply.StatusCode != 200 || reply.Type != AckChange {
-		return err
-	}
-
-	return nil
-}

remote_grain_grpc.go

@@ -0,0 +1,341 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	proto "git.tornberg.me/go-cart-actor/proto" // generated package name is 'messages'; aliased as proto for consistency
+	"google.golang.org/grpc"
+)
+
+// RemoteGrainGRPC is the gRPC-backed implementation of a remote grain.
+// It mirrors the previous RemoteGrain (TCP/frame based) while using the
+// new CartActor gRPC service. It implements the Grain interface so that
+// SyncedPool can remain largely unchanged when swapping transport layers.
+type RemoteGrainGRPC struct {
+	Id     CartId
+	Host   string
+	client proto.CartActorClient
+	// Optional: keep the underlying conn so higher-level code can close if needed
+	conn *grpc.ClientConn
+
+	// Per-call timeout settings (tunable)
+	mutateTimeout time.Duration
+	stateTimeout  time.Duration
+}
+
+// NewRemoteGrainGRPC constructs a remote grain adapter from an existing gRPC client.
+func NewRemoteGrainGRPC(id CartId, host string, client proto.CartActorClient) *RemoteGrainGRPC {
+	return &RemoteGrainGRPC{
+		Id:            id,
+		Host:          host,
+		client:        client,
+		mutateTimeout: 800 * time.Millisecond,
+		stateTimeout:  400 * time.Millisecond,
+	}
+}
+
+// NewRemoteGrainGRPCWithConn dials the target and creates the gRPC client.
+// target should be host:port (where the CartActor service is exposed).
+func NewRemoteGrainGRPCWithConn(id CartId, host string, target string, dialOpts ...grpc.DialOption) (*RemoteGrainGRPC, error) {
+	// NOTE: insecure for initial migration; should be replaced with TLS later.
+	baseOpts := []grpc.DialOption{grpc.WithInsecure(), grpc.WithBlock()}
+	baseOpts = append(baseOpts, dialOpts...)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	conn, err := grpc.DialContext(ctx, target, baseOpts...)
+	if err != nil {
+		return nil, err
+	}
+
+	client := proto.NewCartActorClient(conn)
+	return &RemoteGrainGRPC{
+		Id:            id,
+		Host:          host,
+		client:        client,
+		conn:          conn,
+		mutateTimeout: 800 * time.Millisecond,
+		stateTimeout:  400 * time.Millisecond,
+	}, nil
+}
+
+func (g *RemoteGrainGRPC) GetId() CartId {
+	return g.Id
+}
+
+// Apply executes a cart mutation via per-mutation RPCs (breaking v2 API)
+// and returns a *CartGrain reconstructed from the CartMutationReply state.
+func (g *RemoteGrainGRPC) Apply(content interface{}, isReplay bool) (*CartGrain, error) {
+	if isReplay {
+		return nil, fmt.Errorf("replay not supported for remote grains")
+	}
+	if content == nil {
+		return nil, fmt.Errorf("nil mutation content")
+	}
+
+	ts := time.Now().Unix()
+
+	var invoke func(ctx context.Context) (*proto.CartMutationReply, error)
+
+	switch m := content.(type) {
+	case *proto.AddRequest:
+		invoke = func(ctx context.Context) (*proto.CartMutationReply, error) {
+			return g.client.AddRequest(ctx, &proto.AddRequestRequest{
+				CartId:          g.Id.String(),
+				ClientTimestamp: ts,
+				Payload:         m,
+			})
+		}
+	case *proto.AddItem:
+		invoke = func(ctx context.Context) (*proto.CartMutationReply, error) {
+			return g.client.AddItem(ctx, &proto.AddItemRequest{
+				CartId:          g.Id.String(),
+				ClientTimestamp: ts,
+				Payload:         m,
+			})
+		}
+	case *proto.RemoveItem:
+		invoke = func(ctx context.Context) (*proto.CartMutationReply, error) {
+			return g.client.RemoveItem(ctx, &proto.RemoveItemRequest{
+				CartId:          g.Id.String(),
+				ClientTimestamp: ts,
+				Payload:         m,
+			})
+		}
+	case *proto.RemoveDelivery:
+		invoke = func(ctx context.Context) (*proto.CartMutationReply, error) {
+			return g.client.RemoveDelivery(ctx, &proto.RemoveDeliveryRequest{
+				CartId:          g.Id.String(),
+				ClientTimestamp: ts,
+				Payload:         m,
+			})
+		}
+	case *proto.ChangeQuantity:
+		invoke = func(ctx context.Context) (*proto.CartMutationReply, error) {
+			return g.client.ChangeQuantity(ctx, &proto.ChangeQuantityRequest{
+				CartId:          g.Id.String(),
+				ClientTimestamp: ts,
+				Payload:         m,
+			})
+		}
+	case *proto.SetDelivery:
+		invoke = func(ctx context.Context) (*proto.CartMutationReply, error) {
+			return g.client.SetDelivery(ctx, &proto.SetDeliveryRequest{
+				CartId:          g.Id.String(),
+				ClientTimestamp: ts,
+				Payload:         m,
+			})
+		}
+	case *proto.SetPickupPoint:
+		invoke = func(ctx context.Context) (*proto.CartMutationReply, error) {
+			return g.client.SetPickupPoint(ctx, &proto.SetPickupPointRequest{
+				CartId:          g.Id.String(),
+				ClientTimestamp: ts,
+				Payload:         m,
+			})
+		}
+	case *proto.CreateCheckoutOrder:
+		return nil, fmt.Errorf("CreateCheckoutOrder deprecated: checkout is handled via HTTP endpoint (HandleCheckout)")
+	case *proto.SetCartRequest:
+		invoke = func(ctx context.Context) (*proto.CartMutationReply, error) {
+			return g.client.SetCartItems(ctx, &proto.SetCartItemsRequest{
+				CartId:          g.Id.String(),
+				ClientTimestamp: ts,
+				Payload:         m,
+			})
+		}
+	case *proto.OrderCreated:
+		invoke = func(ctx context.Context) (*proto.CartMutationReply, error) {
+			return g.client.OrderCompleted(ctx, &proto.OrderCompletedRequest{
+				CartId:          g.Id.String(),
+				ClientTimestamp: ts,
+				Payload:         m,
+			})
+		}
+	default:
+		return nil, fmt.Errorf("unsupported mutation type %T", content)
+	}
+
+	if invoke == nil {
+		return nil, fmt.Errorf("no invocation mapped for mutation %T", content)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), g.mutateTimeout)
+	defer cancel()
+
+	resp, err := invoke(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		if e := resp.GetError(); e != "" {
+			return nil, fmt.Errorf("remote mutation failed %d: %s", resp.StatusCode, e)
+		}
+		return nil, fmt.Errorf("remote mutation failed %d", resp.StatusCode)
+	}
+	state := resp.GetState()
+	if state == nil {
+		return nil, fmt.Errorf("mutation reply missing state on success")
+	}
+	// Reconstruct a lightweight CartGrain (only fields we expose internally)
+	grain := &CartGrain{
+		Id:                ToCartId(state.CartId),
+		TotalPrice:        state.TotalPrice,
+		TotalTax:          state.TotalTax,
+		TotalDiscount:     state.TotalDiscount,
+		PaymentInProgress: state.PaymentInProgress,
+		OrderReference:    state.OrderReference,
+		PaymentStatus:     state.PaymentStatus,
+	}
+	// Items
+	for _, it := range state.Items {
+		if it == nil {
+			continue
+		}
+		outlet := toPtr(it.Outlet)
+		storeId := toPtr(it.StoreId)
+		grain.Items = append(grain.Items, &CartItem{
+			Id:          int(it.Id),
+			ItemId:      int(it.SourceItemId),
+			Sku:         it.Sku,
+			Name:        it.Name,
+			Price:       it.UnitPrice,
+			Quantity:    int(it.Quantity),
+			TotalPrice:  it.TotalPrice,
+			TotalTax:    it.TotalTax,
+			OrgPrice:    it.OrgPrice,
+			TaxRate:     int(it.TaxRate),
+			Brand:       it.Brand,
+			Category:    it.Category,
+			Category2:   it.Category2,
+			Category3:   it.Category3,
+			Category4:   it.Category4,
+			Category5:   it.Category5,
+			Image:       it.Image,
+			ArticleType: it.ArticleType,
+			SellerId:    it.SellerId,
+			SellerName:  it.SellerName,
+			Disclaimer:  it.Disclaimer,
+			Outlet:      outlet,
+			StoreId:     storeId,
+			Stock:       StockStatus(it.Stock),
+		})
+	}
+	// Deliveries
+	for _, d := range state.Deliveries {
+		if d == nil {
+			continue
+		}
+		intIds := make([]int, 0, len(d.ItemIds))
+		for _, id := range d.ItemIds {
+			intIds = append(intIds, int(id))
+		}
+		grain.Deliveries = append(grain.Deliveries, &CartDelivery{
+			Id:          int(d.Id),
+			Provider:    d.Provider,
+			Price:       d.Price,
+			Items:       intIds,
+			PickupPoint: d.PickupPoint,
+		})
+	}
+
+	return grain, nil
+}
+
+// GetCurrentState retrieves the current cart state using the typed StateReply oneof.
+func (g *RemoteGrainGRPC) GetCurrentState() (*CartGrain, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), g.stateTimeout)
+	defer cancel()
+	resp, err := g.client.GetState(ctx, &proto.StateRequest{CartId: g.Id.String()})
+	if err != nil {
+		return nil, err
+	}
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		if e := resp.GetError(); e != "" {
+			return nil, fmt.Errorf("remote get state failed %d: %s", resp.StatusCode, e)
+		}
+		return nil, fmt.Errorf("remote get state failed %d", resp.StatusCode)
+	}
+	state := resp.GetState()
+	if state == nil {
+		return nil, fmt.Errorf("state reply missing state on success")
+	}
+	grain := &CartGrain{
+		Id:                ToCartId(state.CartId),
+		TotalPrice:        state.TotalPrice,
+		TotalTax:          state.TotalTax,
+		TotalDiscount:     state.TotalDiscount,
+		PaymentInProgress: state.PaymentInProgress,
+		OrderReference:    state.OrderReference,
+		PaymentStatus:     state.PaymentStatus,
+	}
+	for _, it := range state.Items {
+		if it == nil {
+			continue
+		}
+		outlet := toPtr(it.Outlet)
+		storeId := toPtr(it.StoreId)
+		grain.Items = append(grain.Items, &CartItem{
+			Id:          int(it.Id),
+			ItemId:      int(it.SourceItemId),
+			Sku:         it.Sku,
+			Name:        it.Name,
+			Price:       it.UnitPrice,
+			Quantity:    int(it.Quantity),
+			TotalPrice:  it.TotalPrice,
+			TotalTax:    it.TotalTax,
+			OrgPrice:    it.OrgPrice,
+			TaxRate:     int(it.TaxRate),
+			Brand:       it.Brand,
+			Category:    it.Category,
+			Category2:   it.Category2,
+			Category3:   it.Category3,
+			Category4:   it.Category4,
+			Category5:   it.Category5,
+			Image:       it.Image,
+			ArticleType: it.ArticleType,
+			SellerId:    it.SellerId,
+			SellerName:  it.SellerName,
+			Disclaimer:  it.Disclaimer,
+			Outlet:      outlet,
+			StoreId:     storeId,
+			Stock:       StockStatus(it.Stock),
+		})
+	}
+	for _, d := range state.Deliveries {
+		if d == nil {
+			continue
+		}
+		intIds := make([]int, 0, len(d.ItemIds))
+		for _, id := range d.ItemIds {
+			intIds = append(intIds, int(id))
+		}
+		grain.Deliveries = append(grain.Deliveries, &CartDelivery{
+			Id:          int(d.Id),
+			Provider:    d.Provider,
+			Price:       d.Price,
+			Items:       intIds,
+			PickupPoint: d.PickupPoint,
+		})
+	}
+
+	return grain, nil
+}
+
+// Close closes the underlying gRPC connection if this adapter created it.
+func (g *RemoteGrainGRPC) Close() error {
+	if g.conn != nil {
+		return g.conn.Close()
+	}
+	return nil
+}
+
+// Debug helper to log operations (optional).
+func (g *RemoteGrainGRPC) logf(format string, args ...interface{}) {
+	log.Printf("[remote-grain-grpc host=%s id=%s] %s", g.Host, g.Id.String(), fmt.Sprintf(format, args...))
+}

rpc-server.go

@@ -1,69 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"fmt"
-)
-
-type GrainHandler struct {
-	*GenericListener
-	pool *GrainLocalPool
-}
-
-func (h *GrainHandler) GetState(id CartId, reply *Grain) error {
-	grain, err := h.pool.GetGrain(id)
-	if err != nil {
-		return err
-	}
-	*reply = grain
-	return nil
-}
-
-func NewGrainHandler(pool *GrainLocalPool, listen string) (*GrainHandler, error) {
-	conn := NewConnection(listen, nil)
-	server, err := conn.Listen()
-	handler := &GrainHandler{
-		GenericListener: server,
-		pool:            pool,
-	}
-	server.AddHandler(RemoteHandleMutation, handler.RemoteHandleMessageHandler)
-	server.AddHandler(RemoteGetState, handler.RemoteGetStateHandler)
-	return handler, err
-}
-
-func (h *GrainHandler) IsHealthy() bool {
-	return len(h.pool.grains) < h.pool.PoolSize
-}
-
-func (h *GrainHandler) RemoteHandleMessageHandler(data *FrameWithPayload, resultChan chan<- FrameWithPayload) error {
-	cartData, err := GetCartFrame(data.Payload)
-	if err != nil {
-		return err
-	}
-	var msg Message
-	err = ReadMessage(bytes.NewReader(cartData.Data), &msg)
-	if err != nil {
-		fmt.Println("Error reading message:", err)
-		return err
-	}
-
-	replyData, err := h.pool.Process(cartData.Id, msg)
-	if err != nil {
-		return err
-	}
-	resultChan <- *replyData
-	return err
-}
-
-func (h *GrainHandler) RemoteGetStateHandler(data *FrameWithPayload, resultChan chan<- FrameWithPayload) error {
-	cartData, err := GetCartFrame(data.Payload)
-	if err != nil {
-		return err
-	}
-	reply, err := h.pool.Get(cartData.Id)
-	if err != nil {
-		return err
-	}
-	resultChan <- *reply
-	return nil
-}

synced-pool.go

@@ -1,36 +1,59 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"log"
-	"net"
-	"strings"
 	"sync"
 	"time"
 
+	proto "git.tornberg.me/go-cart-actor/proto"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
-	"github.com/yudhasubki/netpool"
+	"google.golang.org/grpc"
 	"k8s.io/apimachinery/pkg/watch"
 )
 
-type Quorum interface {
-	Negotiate(knownHosts []string) ([]string, error)
-	OwnerChanged(CartId, host string) error
-}
-
-type HealthHandler interface {
-	IsHealthy() bool
-}
-
+// SyncedPool coordinates cart grain ownership across nodes using gRPC control plane
+// and cart actor services. Legacy frame / TCP code has been removed.
+//
+// Responsibilities:
+//   - Local grain access (delegates to GrainLocalPool)
+//   - Remote grain proxy management (RemoteGrainGRPC)
+//   - Cluster membership (AddRemote via discovery + negotiation)
+//   - Ownership acquisition (quorum via ConfirmOwner RPC)
+//   - Health/ping monitoring & remote removal
+//
+// Thread-safety: public methods that mutate internal maps lock p.mu (RWMutex).
 type SyncedPool struct {
-	Server               *GenericListener
-	mu                   sync.RWMutex
-	discardedHostHandler *DiscardedHostHandler
 	Hostname string
 	local    *GrainLocalPool
-	remotes              map[string]*RemoteHost
-	remoteIndex          map[CartId]*RemoteGrain
+
+	mu sync.RWMutex
+
+	// Remote host state (gRPC only)
+	remoteHosts map[string]*RemoteHostGRPC // host -> remote host
+
+	// Remote grain proxies (by cart id)
+	remoteIndex map[CartId]Grain
+
+	// Discovery handler for re-adding hosts after failures
+	discardedHostHandler *DiscardedHostHandler
+
+	// Metrics / instrumentation dependencies already declared globally
+}
+
+// RemoteHostGRPC tracks a remote host's clients & health.
+type RemoteHostGRPC struct {
+	Host          string
+	Conn          *grpc.ClientConn
+	CartClient    proto.CartActorClient
+	ControlClient proto.ControlPlaneClient
+	MissedPings   int
+}
+
+func (r *RemoteHostGRPC) IsHealthy() bool {
+	return r.MissedPings < 3
 }
 
 var (
@@ -50,241 +73,172 @@ var (
 		Name: "cart_remote_lookup_total",
 		Help: "The total number of remote lookups",
 	})
-	packetQueue = promauto.NewGauge(prometheus.GaugeOpts{
-		Name: "cart_packet_queue_size",
-		Help: "The total number of packets in the queue",
-	})
-	packetsSent = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "cart_pool_packets_sent_total",
-		Help: "The total number of packets sent",
-	})
-	packetsReceived = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "cart_pool_packets_received_total",
-		Help: "The total number of packets received",
-	})
 )
 
-func (p *SyncedPool) PongHandler(data *FrameWithPayload, resultChan chan<- FrameWithPayload) error {
-	resultChan <- MakeFrameWithPayload(Pong, 200, []byte{})
-	return nil
-}
-
-func (p *SyncedPool) GetCartIdHandler(data *FrameWithPayload, resultChan chan<- FrameWithPayload) error {
-	ids := make([]string, 0, len(p.local.grains))
-	p.mu.RLock()
-	defer p.mu.RUnlock()
-	for id := range p.local.grains {
-		if p.local.grains[id] == nil {
-			continue
-		}
-		s := id.String()
-		if s == "" {
-			continue
-		}
-		ids = append(ids, s)
-	}
-	log.Printf("Returning %d cart ids\n", len(ids))
-	resultChan <- MakeFrameWithPayload(CartIdsResponse, 200, []byte(strings.Join(ids, ";")))
-	return nil
-}
-
-func (p *SyncedPool) NegotiateHandler(data *FrameWithPayload, resultChan chan<- FrameWithPayload) error {
-	negotiationCount.Inc()
-	log.Printf("Handling negotiation\n")
-	for _, host := range p.ExcludeKnown(strings.Split(string(data.Payload), ";")) {
-		if host == "" {
-			continue
-		}
-		go p.AddRemote(host)
-
-	}
-	p.mu.RLock()
-	defer p.mu.RUnlock()
-	hosts := make([]string, 0, len(p.remotes))
-	for _, r := range p.remotes {
-		if r.IsHealthy() {
-			hosts = append(hosts, r.Host)
-		}
-	}
-	resultChan <- MakeFrameWithPayload(RemoteNegotiateResponse, 200, []byte(strings.Join(hosts, ";")))
-	return nil
-}
-
-func (p *SyncedPool) GrainOwnerChangeHandler(data *FrameWithPayload, resultChan chan<- FrameWithPayload) error {
-	grainSyncCount.Inc()
-
-	idAndHostParts := strings.Split(string(data.Payload), ";")
-	if len(idAndHostParts) != 2 {
-		log.Printf("Invalid remote grain change message")
-		resultChan <- MakeFrameWithPayload(AckError, 500, []byte("invalid"))
-		return nil
-	}
-	id := ToCartId(idAndHostParts[0])
-	host := idAndHostParts[1]
-	log.Printf("Handling remote grain owner change to %s for id %s", host, id)
-	for _, r := range p.remotes {
-		if r.Host == host && r.IsHealthy() {
-			go p.SpawnRemoteGrain(id, host)
-			break
-		}
-	}
-	go p.AddRemote(host)
-	resultChan <- MakeFrameWithPayload(AckChange, 200, []byte("ok"))
-	return nil
-}
-
-func (p *SyncedPool) RemoveRemoteGrain(id CartId) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-	delete(p.remoteIndex, id)
-}
-
-func (p *SyncedPool) SpawnRemoteGrain(id CartId, host string) {
-	if id.String() == "" {
-		log.Printf("Invalid grain id, %s", id)
-		return
-	}
-	p.mu.RLock()
-	localGrain, ok := p.local.grains[id]
-	p.mu.RUnlock()
-
-	if ok && localGrain != nil {
-		log.Printf("Grain %s already exists locally, owner is (%s)", id, host)
-		p.mu.Lock()
-		delete(p.local.grains, id)
-		p.mu.Unlock()
-	}
-
-	go func(i CartId, h string) {
-		var pool netpool.Netpooler
-		p.mu.RLock()
-		for _, r := range p.remotes {
-			if r.Host == h {
-				pool = r.HostPool
-				break
-			}
-		}
-		p.mu.RUnlock()
-		if pool == nil {
-			log.Printf("Error spawning remote grain, no pool for %s", h)
-			return
-		}
-		remoteGrain := NewRemoteGrain(i, h, pool)
-
-		p.mu.Lock()
-		p.remoteIndex[i] = remoteGrain
-		p.mu.Unlock()
-	}(id, host)
-}
-
-func (p *SyncedPool) HandleHostError(host string) {
-	p.mu.RLock()
-	defer p.mu.RUnlock()
-	for _, r := range p.remotes {
-		if r.Host == host {
-			if !r.IsHealthy() {
-				go p.RemoveHost(r)
-			}
-			return
-		}
-	}
-}
-
 func NewSyncedPool(local *GrainLocalPool, hostname string, discovery Discovery) (*SyncedPool, error) {
-	listen := fmt.Sprintf("%s:1338", hostname)
-	conn := NewConnection(listen, nil)
-	server, err := conn.Listen()
-	if err != nil {
-		return nil, err
-	}
-
-	log.Printf("Listening on %s", listen)
-	dh := NewDiscardedHostHandler(1338)
-	pool := &SyncedPool{
-		Server:               server,
+	p := &SyncedPool{
 		Hostname:             hostname,
 		local:                local,
-		discardedHostHandler: dh,
-		remotes:              make(map[string]*RemoteHost),
-		remoteIndex:          make(map[CartId]*RemoteGrain),
+		remoteHosts:          make(map[string]*RemoteHostGRPC),
+		remoteIndex:          make(map[CartId]Grain),
+		discardedHostHandler: NewDiscardedHostHandler(1338),
 	}
-	dh.SetReconnectHandler(pool.AddRemote)
-	server.AddHandler(Ping, pool.PongHandler)
-	server.AddHandler(GetCartIds, pool.GetCartIdHandler)
-	server.AddHandler(RemoteNegotiate, pool.NegotiateHandler)
-	server.AddHandler(RemoteGrainChanged, pool.GrainOwnerChangeHandler)
-	server.AddHandler(Closing, pool.HostTerminatingHandler)
+	p.discardedHostHandler.SetReconnectHandler(p.AddRemote)
 
 	if discovery != nil {
 		go func() {
-			time.Sleep(time.Second * 5)
-			log.Printf("Starting discovery")
+			time.Sleep(3 * time.Second) // allow gRPC server startup
+			log.Printf("Starting discovery watcher")
 			ch, err := discovery.Watch()
 			if err != nil {
-				log.Printf("Error discovering hosts: %v", err)
+				log.Printf("Discovery error: %v", err)
 				return
 			}
-			for chng := range ch {
-				if chng.Host == "" {
+			for evt := range ch {
+				if evt.Host == "" {
 					continue
 				}
-				known := pool.IsKnown(chng.Host)
-				if chng.Type != watch.Deleted && !known {
-
-					log.Printf("Discovered host %s, waiting for startup", chng.Host)
-					time.Sleep(3 * time.Second)
-					pool.AddRemote(chng.Host)
-
-				} else if chng.Type == watch.Deleted && known {
-					log.Printf("Host removed %s, removing from index", chng.Host)
-					for _, r := range pool.remotes {
-						if r.Host == chng.Host {
-							pool.RemoveHost(r)
-							break
+				switch evt.Type {
+				case watch.Deleted:
+					if p.IsKnown(evt.Host) {
+						p.RemoveHost(evt.Host)
 					}
+				default:
+					if !p.IsKnown(evt.Host) {
+						log.Printf("Discovered host %s", evt.Host)
+						p.AddRemote(evt.Host)
 					}
 				}
 			}
 		}()
 	} else {
-		log.Printf("No discovery, waiting for remotes to connect")
+		log.Printf("No discovery configured; expecting manual AddRemote or static host injection")
 	}
 
-	return pool, nil
+	return p, nil
 }
 
-func (p *SyncedPool) HostTerminatingHandler(data *FrameWithPayload, resultChan chan<- FrameWithPayload) error {
-	log.Printf("Remote host terminating")
-	host := string(data.Payload)
-	p.mu.RLock()
-	defer p.mu.RUnlock()
-	for _, r := range p.remotes {
-		if r.Host == host {
-			go p.RemoveHost(r)
+// ------------------------- Remote Host Management -----------------------------
+
+// AddRemote dials a remote host and initializes grain proxies.
+func (p *SyncedPool) AddRemote(host string) {
+	if host == "" || host == p.Hostname {
+		return
+	}
+
+	p.mu.Lock()
+	if _, exists := p.remoteHosts[host]; exists {
+		p.mu.Unlock()
+		return
+	}
+	p.mu.Unlock()
+
+	target := fmt.Sprintf("%s:1337", host)
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	conn, err := grpc.DialContext(ctx, target, grpc.WithInsecure(), grpc.WithBlock())
+	if err != nil {
+		log.Printf("AddRemote: dial %s failed: %v", target, err)
+		return
+	}
+
+	cartClient := proto.NewCartActorClient(conn)
+	controlClient := proto.NewControlPlaneClient(conn)
+
+	// Health check (Ping) with limited retries
+	pings := 3
+	for pings > 0 {
+		ctxPing, cancelPing := context.WithTimeout(context.Background(), 1*time.Second)
+		_, pingErr := controlClient.Ping(ctxPing, &proto.Empty{})
+		cancelPing()
+		if pingErr == nil {
 			break
 		}
+		pings--
+		time.Sleep(200 * time.Millisecond)
+		if pings == 0 {
+			log.Printf("AddRemote: ping %s failed after retries: %v", host, pingErr)
+			conn.Close()
+			return
 		}
-	resultChan <- MakeFrameWithPayload(Pong, 200, []byte("ok"))
-	return nil
+	}
+
+	remote := &RemoteHostGRPC{
+		Host:          host,
+		Conn:          conn,
+		CartClient:    cartClient,
+		ControlClient: controlClient,
+		MissedPings:   0,
+	}
+
+	p.mu.Lock()
+	p.remoteHosts[host] = remote
+	p.mu.Unlock()
+	connectedRemotes.Set(float64(p.RemoteCount()))
+
+	log.Printf("Connected to remote host %s", host)
+
+	go p.pingLoop(remote)
+	go p.initializeRemote(remote)
+	go p.Negotiate()
 }
 
-func (p *SyncedPool) IsHealthy() bool {
-	for _, r := range p.remotes {
-		if !r.IsHealthy() {
-			return false
+// initializeRemote fetches remote cart ids and sets up remote grain proxies.
+func (p *SyncedPool) initializeRemote(remote *RemoteHostGRPC) {
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+	reply, err := remote.ControlClient.GetCartIds(ctx, &proto.Empty{})
+	if err != nil {
+		log.Printf("Init remote %s: GetCartIds error: %v", remote.Host, err)
+		return
+	}
+	count := 0
+	for _, idStr := range reply.CartIds {
+		if idStr == "" {
+			continue
+		}
+		p.SpawnRemoteGrain(ToCartId(idStr), remote.Host)
+		count++
+	}
+	log.Printf("Remote %s reported %d grains", remote.Host, count)
+}
+
+// RemoveHost removes remote host and its grains.
+func (p *SyncedPool) RemoveHost(host string) {
+	p.mu.Lock()
+	remote, exists := p.remoteHosts[host]
+	if exists {
+		delete(p.remoteHosts, host)
+	}
+	// remove grains pointing to host
+	for id, g := range p.remoteIndex {
+		if rg, ok := g.(*RemoteGrainGRPC); ok && rg.Host == host {
+			delete(p.remoteIndex, id)
 		}
 	}
-	return true
+	p.mu.Unlock()
+
+	if exists {
+		remote.Conn.Close()
+	}
+	connectedRemotes.Set(float64(p.RemoteCount()))
+}
+
+// RemoteCount returns number of tracked remote hosts.
+func (p *SyncedPool) RemoteCount() int {
+	p.mu.RLock()
+	defer p.mu.RUnlock()
+	return len(p.remoteHosts)
 }
 
 func (p *SyncedPool) IsKnown(host string) bool {
-	for _, r := range p.remotes {
-		if r.Host == host {
+	if host == p.Hostname {
 		return true
 	}
-	}
-
-	return host == p.Hostname
+	p.mu.RLock()
+	defer p.mu.RUnlock()
+	_, ok := p.remoteHosts[host]
+	return ok
 }
 
 func (p *SyncedPool) ExcludeKnown(hosts []string) []string {
@@ -297,239 +251,216 @@ func (p *SyncedPool) ExcludeKnown(hosts []string) []string {
 	return ret
 }
 
-func (p *SyncedPool) RemoveHost(host *RemoteHost) {
-	p.mu.Lock()
-	delete(p.remotes, host.Host)
-	p.mu.Unlock()
-	p.RemoveHostMappedCarts(host)
-	p.discardedHostHandler.AppendHost(host.Host)
-	connectedRemotes.Set(float64(len(p.remotes)))
-}
+// ------------------------- Health / Ping -------------------------------------
 
-func (p *SyncedPool) RemoveHostMappedCarts(host *RemoteHost) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-	for id, r := range p.remoteIndex {
-		if r.Host == host.Host {
-			delete(p.remoteIndex, id)
-		}
-	}
-}
-
-const (
-	RemoteNegotiate         = FrameType(3)
-	RemoteGrainChanged      = FrameType(4)
-	AckChange               = FrameType(5)
-	AckError                = FrameType(6)
-	Ping                    = FrameType(7)
-	Pong                    = FrameType(8)
-	GetCartIds              = FrameType(9)
-	CartIdsResponse         = FrameType(10)
-	RemoteNegotiateResponse = FrameType(11)
-	Closing                 = FrameType(12)
-)
-
-func (p *SyncedPool) Negotiate() {
-	knownHosts := make([]string, 0, len(p.remotes)+1)
-	for _, r := range p.remotes {
-		knownHosts = append(knownHosts, r.Host)
-	}
-	knownHosts = append([]string{p.Hostname}, knownHosts...)
-
-	for _, r := range p.remotes {
-		hosts, err := r.Negotiate(knownHosts)
+func (p *SyncedPool) pingLoop(remote *RemoteHostGRPC) {
+	ticker := time.NewTicker(3 * time.Second)
+	defer ticker.Stop()
+	for range ticker.C {
+		ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
+		_, err := remote.ControlClient.Ping(ctx, &proto.Empty{})
+		cancel()
 		if err != nil {
-			log.Printf("Error negotiating with %s: %v\n", r.Host, err)
+			remote.MissedPings++
+			log.Printf("Ping %s failed (%d)", remote.Host, remote.MissedPings)
+			if !remote.IsHealthy() {
+				log.Printf("Remote %s unhealthy, removing", remote.Host)
+				p.RemoveHost(remote.Host)
 				return
 			}
-		for _, h := range hosts {
+			continue
+		}
+		remote.MissedPings = 0
+	}
+}
+
+func (p *SyncedPool) IsHealthy() bool {
+	p.mu.RLock()
+	defer p.mu.RUnlock()
+	for _, r := range p.remoteHosts {
+		if !r.IsHealthy() {
+			return false
+		}
+	}
+	return true
+}
+
+// ------------------------- Negotiation ---------------------------------------
+
+func (p *SyncedPool) Negotiate() {
+	negotiationCount.Inc()
+
+	p.mu.RLock()
+	hosts := make([]string, 0, len(p.remoteHosts)+1)
+	hosts = append(hosts, p.Hostname)
+	for h := range p.remoteHosts {
+		hosts = append(hosts, h)
+	}
+	remotes := make([]*RemoteHostGRPC, 0, len(p.remoteHosts))
+	for _, r := range p.remoteHosts {
+		remotes = append(remotes, r)
+	}
+	p.mu.RUnlock()
+
+	for _, r := range remotes {
+		ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+		reply, err := r.ControlClient.Negotiate(ctx, &proto.NegotiateRequest{KnownHosts: hosts})
+		cancel()
+		if err != nil {
+			log.Printf("Negotiate with %s failed: %v", r.Host, err)
+			continue
+		}
+		for _, h := range reply.Hosts {
 			if !p.IsKnown(h) {
 				p.AddRemote(h)
 			}
 		}
 	}
-
 }
 
-func (p *SyncedPool) GetHealthyRemotes() []*RemoteHost {
+// ------------------------- Grain Management ----------------------------------
+
+// RemoveRemoteGrain removes a remote grain mapping.
+func (p *SyncedPool) RemoveRemoteGrain(id CartId) {
+	p.mu.Lock()
+	delete(p.remoteIndex, id)
+	p.mu.Unlock()
+}
+
+// SpawnRemoteGrain creates/updates a remote grain proxy for a given host.
+func (p *SyncedPool) SpawnRemoteGrain(id CartId, host string) {
+	if id.String() == "" {
+		return
+	}
+	p.mu.Lock()
+	// If local grain exists, remove it (ownership changed)
+	if g, ok := p.local.grains[id]; ok && g != nil {
+		delete(p.local.grains, id)
+	}
+	remoteHost, ok := p.remoteHosts[host]
+	if !ok {
+		p.mu.Unlock()
+		log.Printf("SpawnRemoteGrain: host %s unknown (id=%s), attempting AddRemote", host, id)
+		go p.AddRemote(host)
+		return
+	}
+	rg := NewRemoteGrainGRPC(id, host, remoteHost.CartClient)
+	p.remoteIndex[id] = rg
+	p.mu.Unlock()
+}
+
+// GetHealthyRemotes returns a copy slice of healthy remote hosts.
+func (p *SyncedPool) GetHealthyRemotes() []*RemoteHostGRPC {
 	p.mu.RLock()
 	defer p.mu.RUnlock()
-	remotes := make([]*RemoteHost, 0, len(p.remotes))
-	for _, r := range p.remotes {
+	ret := make([]*RemoteHostGRPC, 0, len(p.remoteHosts))
+	for _, r := range p.remoteHosts {
 		if r.IsHealthy() {
-			remotes = append(remotes, r)
+			ret = append(ret, r)
 		}
 	}
-	return remotes
+	return ret
 }
 
+// RequestOwnership attempts to become owner of a cart, requiring quorum.
+// On success local grain is (or will be) created; peers spawn remote proxies.
 func (p *SyncedPool) RequestOwnership(id CartId) error {
 	ok := 0
 	all := 0
-
-	for _, r := range p.GetHealthyRemotes() {
-
-		err := r.ConfirmChange(id, p.Hostname)
+	remotes := p.GetHealthyRemotes()
+	for _, r := range remotes {
+		ctx, cancel := context.WithTimeout(context.Background(), 800*time.Millisecond)
+		reply, err := r.ControlClient.ConfirmOwner(ctx, &proto.OwnerChangeRequest{
+			CartId:  id.String(),
+			NewHost: p.Hostname,
+		})
+		cancel()
 		all++
-		if err != nil {
-			if !r.IsHealthy() {
-				log.Printf("Ownership: Removing host, unable to communicate with %s", r.Host)
-				p.RemoveHost(r)
-				all--
-			} else {
-				log.Printf("Error confirming change: %v from %s\n", err, p.Hostname)
-			}
+		if err != nil || reply == nil || !reply.Accepted {
+			log.Printf("ConfirmOwner failure from %s for %s: %v (reply=%v)", r.Host, id, err, reply)
 			continue
 		}
-		//log.Printf("Remote confirmed change %s\n", r.Host)
 		ok++
 	}
 
+	// Quorum rule mirrors legacy:
+	//  - If fewer than 3 total, require all.
+	//  - Else require majority (ok >= all/2).
 	if (all < 3 && ok < all) || ok < (all/2) {
 		p.removeLocalGrain(id)
-		return fmt.Errorf("quorum not reached")
+		return fmt.Errorf("quorum not reached (ok=%d all=%d)", ok, all)
 	}
+	grainSyncCount.Inc()
 	return nil
 }
 
 func (p *SyncedPool) removeLocalGrain(id CartId) {
 	p.mu.Lock()
-	defer p.mu.Unlock()
 	delete(p.local.grains, id)
+	p.mu.Unlock()
 }
 
-func (p *SyncedPool) AddRemote(host string) {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-	_, hasHost := p.remotes[host]
-	if host == "" || hasHost || host == p.Hostname {
-		return
-	}
-
-	host_pool, err := netpool.New(func() (net.Conn, error) {
-		return net.Dial("tcp", fmt.Sprintf("%s:1338", host))
-	}, netpool.WithMaxPool(128), netpool.WithMinPool(0))
-
-	if err != nil {
-		log.Printf("Error creating host pool: %v\n", err)
-		return
-	}
-
-	client := NewConnection(fmt.Sprintf("%s:1338", host), host_pool)
-
-	pings := 3
-	for pings >= 0 {
-		_, err = client.Call(Ping, nil)
-		if err != nil {
-			log.Printf("Ping failed when adding %s, trying %d more times\n", host, pings)
-			pings--
-			time.Sleep(time.Millisecond * 300)
-			continue
-		}
-		break
-	}
-	log.Printf("Connected to remote %s", host)
-
-	cart_pool, err := netpool.New(func() (net.Conn, error) {
-		return net.Dial("tcp", fmt.Sprintf("%s:1337", host))
-	}, netpool.WithMaxPool(128), netpool.WithMinPool(0))
-
-	if err != nil {
-		log.Printf("Error creating grain pool: %v\n", err)
-		return
-	}
-
-	remote := RemoteHost{
-		HostPool:    cart_pool,
-		Connection:  client,
-		MissedPings: 0,
-		Host:        host,
-	}
-
-	p.remotes[host] = &remote
-
-	connectedRemotes.Set(float64(len(p.remotes)))
-
-	go p.HandlePing(&remote)
-	go remote.Initialize(p)
-}
-
-func (p *SyncedPool) HandlePing(remote *RemoteHost) {
-	for range time.Tick(time.Second * 3) {
-
-		err := remote.Ping()
-
-		for err != nil {
-			time.Sleep(time.Millisecond * 200)
-			if !remote.IsHealthy() {
-				log.Printf("Removing host, unable to communicate with %s", remote.Host)
-				p.RemoveHost(remote)
-				return
-			}
-			err = remote.Ping()
-		}
-	}
-}
-
+// getGrain returns a local or remote grain; if absent, attempts ownership.
 func (p *SyncedPool) getGrain(id CartId) (Grain, error) {
-	var err error
 	p.mu.RLock()
-	defer p.mu.RUnlock()
-	localGrain, ok := p.local.grains[id]
-	if !ok {
-		// check if remote grain exists
+	localGrain, isLocal := p.local.grains[id]
+	remoteGrain, isRemote := p.remoteIndex[id]
+	p.mu.RUnlock()
 
-		remoteGrain, ok := p.remoteIndex[id]
-
-		if ok {
+	if isLocal && localGrain != nil {
+		return localGrain, nil
+	}
+	if isRemote {
 		remoteLookupCount.Inc()
 		return remoteGrain, nil
 	}
 
+	// Attempt to claim ownership (async semantics preserved)
 	go p.RequestOwnership(id)
-		// if err != nil {
-		// 	log.Printf("Error requesting ownership: %v\n", err)
-		// 	return nil, err
-		// }
 
-		localGrain, err = p.local.GetGrain(id)
+	// Create local grain (lazy spawn) - may be rolled back by quorum failure
+	grain, err := p.local.GetGrain(id)
 	if err != nil {
 		return nil, err
 	}
-
-	}
-	return localGrain, nil
+	return grain, nil
 }
 
-func (p *SyncedPool) Close() {
-	p.mu.Lock()
-	defer p.mu.Unlock()
-	payload := []byte(p.Hostname)
-	for _, r := range p.remotes {
-		go r.Call(Closing, payload)
-	}
-}
-
-func (p *SyncedPool) Process(id CartId, messages ...Message) (*FrameWithPayload, error) {
-	pool, err := p.getGrain(id)
-	var res *FrameWithPayload
-	if err != nil {
-		return nil, err
-	}
-	for _, m := range messages {
-		res, err = pool.HandleMessage(&m, false)
-		if err != nil {
-			return nil, err
-		}
-	}
-	return res, nil
-}
-
-func (p *SyncedPool) Get(id CartId) (*FrameWithPayload, error) {
+// Apply applies a single mutation to a grain (local or remote).
+func (p *SyncedPool) Apply(id CartId, mutation interface{}) (*CartGrain, error) {
 	grain, err := p.getGrain(id)
 	if err != nil {
 		return nil, err
 	}
+	return grain.Apply(mutation, false)
+}
 
+// Get returns current state of a grain (local or remote).
+func (p *SyncedPool) Get(id CartId) (*CartGrain, error) {
+	grain, err := p.getGrain(id)
+	if err != nil {
+		return nil, err
+	}
 	return grain.GetCurrentState()
 }
+
+// Close notifies remotes this host is terminating.
+func (p *SyncedPool) Close() {
+	p.mu.RLock()
+	remotes := make([]*RemoteHostGRPC, 0, len(p.remoteHosts))
+	for _, r := range p.remoteHosts {
+		remotes = append(remotes, r)
+	}
+	p.mu.RUnlock()
+
+	for _, r := range remotes {
+		go func(rh *RemoteHostGRPC) {
+			ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
+			_, err := rh.ControlClient.Closing(ctx, &proto.ClosingNotice{Host: p.Hostname})
+			cancel()
+			if err != nil {
+				log.Printf("Close notify to %s failed: %v", rh.Host, err)
+			}
+		}(r)
+	}
+}

synced-pool_test.go

@@ -1,66 +0,0 @@
-package main
-
-import (
-	"log"
-	"testing"
-	"time"
-
-	messages "git.tornberg.me/go-cart-actor/proto"
-)
-
-func TestConnection(t *testing.T) {
-	// TestConnection tests the connection to the server
-
-	localPool := NewGrainLocalPool(100, time.Minute, func(id CartId) (*CartGrain, error) {
-		return &CartGrain{
-			Id:              id,
-			storageMessages: []Message{},
-			Items:           []*CartItem{},
-			Deliveries:      make([]*CartDelivery, 0),
-			TotalPrice:      0,
-		}, nil
-	})
-	hg, err := NewGrainHandler(localPool, ":1337")
-
-	if err != nil {
-		t.Errorf("Error creating handler: %v\n", err)
-	}
-	if hg == nil {
-		t.Errorf("Expected handler, got nil")
-	}
-	pool, err := NewSyncedPool(localPool, "127.0.0.1", nil)
-	if err != nil {
-		t.Errorf("Error creating pool: %v", err)
-	}
-	time.Sleep(400 * time.Millisecond)
-	pool.AddRemote("127.0.0.1")
-
-	go pool.Negotiate()
-	msg := Message{
-		Type: AddItemType,
-		//TimeStamp: time.Now().Unix(),
-		Content: &messages.AddItem{
-			Quantity: 1,
-			Price:    100,
-			Sku:      "123",
-			Name:     "Test",
-			Image:    "Test",
-		},
-	}
-	data, err := pool.Process(ToCartId("kalle"), msg)
-	if err != nil {
-		t.Errorf("Error getting data: %v", err)
-	}
-	if data.StatusCode != 200 {
-		t.Errorf("Expected 200")
-	}
-	log.Println(data)
-	time.Sleep(2 * time.Millisecond)
-	data, err = pool.Get(ToCartId("kalle"))
-	if err != nil {
-		t.Errorf("Error getting data: %v", err)
-	}
-	if data == nil {
-		t.Errorf("Expected data, got nil")
-	}
-}

tcp-connection.go

@@ -1,232 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"encoding/binary"
-	"fmt"
-	"io"
-	"log"
-	"net"
-	"time"
-
-	"github.com/yudhasubki/netpool"
-)
-
-type Connection struct {
-	address string
-	pool    netpool.Netpooler
-	count   uint64
-}
-
-type FrameType uint32
-type StatusCode uint32
-type CheckSum uint32
-
-type Frame struct {
-	Type       FrameType
-	StatusCode StatusCode
-	Length     uint32
-	Checksum   CheckSum
-}
-
-func (f *Frame) IsValid() bool {
-	return f.Checksum == MakeChecksum(f.Type, f.StatusCode, f.Length)
-}
-
-func MakeChecksum(msg FrameType, statusCode StatusCode, length uint32) CheckSum {
-	sum := CheckSum((uint32(msg) + uint32(statusCode) + length) / 8)
-	return sum
-}
-
-type FrameWithPayload struct {
-	Frame
-	Payload []byte
-}
-
-func MakeFrameWithPayload(msg FrameType, statusCode StatusCode, payload []byte) FrameWithPayload {
-	len := uint32(len(payload))
-	return FrameWithPayload{
-		Frame: Frame{
-			Type:       msg,
-			StatusCode: statusCode,
-			Length:     len,
-			Checksum:   MakeChecksum(msg, statusCode, len),
-		},
-		Payload: payload,
-	}
-}
-
-type FrameData interface {
-	ToBytes() []byte
-	FromBytes([]byte) error
-}
-
-func NewConnection(address string, pool netpool.Netpooler) *Connection {
-	return &Connection{
-		count:   0,
-		pool:    pool,
-		address: address,
-	}
-}
-
-func SendFrame(conn net.Conn, data *FrameWithPayload) error {
-
-	err := binary.Write(conn, binary.LittleEndian, data.Frame)
-	if err != nil {
-		return err
-	}
-	_, err = conn.Write(data.Payload)
-
-	return err
-}
-
-func (c *Connection) CallAsync(msg FrameType, payload []byte, ch chan<- FrameWithPayload) (net.Conn, error) {
-	conn, err := c.pool.Get()
-	//conn, err := net.Dial("tcp", c.address)
-	if err != nil {
-		return conn, err
-	}
-	go WaitForFrame(conn, ch)
-
-	go func(toSend FrameWithPayload) {
-		err = SendFrame(conn, &toSend)
-		if err != nil {
-			log.Printf("Error sending frame: %v\n", err)
-			//close(ch)
-			//conn.Close()
-		}
-	}(MakeFrameWithPayload(msg, 1, payload))
-
-	c.count++
-	return conn, err
-}
-
-func (c *Connection) Call(msg FrameType, data []byte) (*FrameWithPayload, error) {
-	ch := make(chan FrameWithPayload, 1)
-	conn, err := c.CallAsync(msg, data, ch)
-	defer c.pool.Put(conn, err)
-	if err != nil {
-		return nil, err
-	}
-
-	defer close(ch)
-
-	ret := <-ch
-	return &ret, nil
-	// select {
-	// case ret := <-ch:
-	// 	return &ret, nil
-	// case <-time.After(MaxCallDuration):
-	// 	return nil, fmt.Errorf("timeout waiting for frame")
-	// }
-}
-
-func WaitForFrame(conn net.Conn, resultChan chan<- FrameWithPayload) error {
-	var err error
-	var frame Frame
-
-	err = binary.Read(conn, binary.LittleEndian, &frame)
-	if err != nil {
-		return err
-	}
-	if frame.IsValid() {
-		payload := make([]byte, frame.Length)
-		_, err = conn.Read(payload)
-		if err != nil {
-			conn.Close()
-			return err
-		}
-		resultChan <- FrameWithPayload{
-			Frame:   frame,
-			Payload: payload,
-		}
-		return err
-	}
-	log.Println("Checksum mismatch")
-	return fmt.Errorf("checksum mismatch")
-}
-
-type GenericListener struct {
-	StopListener bool
-	handlers     map[FrameType]func(*FrameWithPayload, chan<- FrameWithPayload) error
-}
-
-func (c *Connection) Listen() (*GenericListener, error) {
-	l, err := net.Listen("tcp", c.address)
-	if err != nil {
-		return nil, err
-	}
-	ret := &GenericListener{
-		handlers: make(map[FrameType]func(*FrameWithPayload, chan<- FrameWithPayload) error),
-	}
-	go func() {
-		for !ret.StopListener {
-			connection, err := l.Accept()
-			if err != nil {
-				log.Printf("Error accepting connection: %v\n", err)
-				continue
-			}
-			go ret.HandleConnection(connection)
-		}
-	}()
-	return ret, nil
-}
-
-const (
-	MaxCallDuration   = 300 * time.Millisecond
-	ListenerKeepalive = 5 * time.Second
-)
-
-func (l *GenericListener) HandleConnection(conn net.Conn) {
-	var err error
-	var frame Frame
-	log.Printf("Server Connection accepted: %s\n", conn.RemoteAddr().String())
-	b := bufio.NewReader(conn)
-	for err != io.EOF {
-
-		err = binary.Read(b, binary.LittleEndian, &frame)
-
-		if err == nil && frame.IsValid() {
-			payload := make([]byte, frame.Length)
-			_, err = b.Read(payload)
-			if err == nil {
-				err = l.HandleFrame(conn, &FrameWithPayload{
-					Frame:   frame,
-					Payload: payload,
-				})
-			}
-		}
-	}
-	conn.Close()
-	log.Printf("Server Connection closed")
-}
-
-func (l *GenericListener) AddHandler(msg FrameType, handler func(*FrameWithPayload, chan<- FrameWithPayload) error) {
-	l.handlers[msg] = handler
-}
-
-func (l *GenericListener) HandleFrame(conn net.Conn, frame *FrameWithPayload) error {
-	handler, ok := l.handlers[frame.Type]
-	if ok {
-		go func() {
-			resultChan := make(chan FrameWithPayload, 1)
-			defer close(resultChan)
-			err := handler(frame, resultChan)
-			if err != nil {
-				errFrame := MakeFrameWithPayload(frame.Type, 500, []byte(err.Error()))
-				SendFrame(conn, &errFrame)
-				log.Printf("Handler returned error: %s", err)
-				return
-			}
-			result := <-resultChan
-			err = SendFrame(conn, &result)
-			if err != nil {
-				log.Printf("Error sending frame: %s", err)
-			}
-		}()
-	} else {
-		conn.Close()
-		return fmt.Errorf("no handler for frame type %d", frame.Type)
-	}
-	return nil
-}

tcp-connection_test.go

@@ -1,74 +1,8 @@
+/*
+Legacy TCP networking (GenericListener / Frame protocol) has been removed
+as part of the gRPC migration. This file intentionally contains no tests.
+
+Keeping an empty Go file (with a package declaration) ensures the old
+tcp-connection test target no longer runs without causing build issues.
+*/
 package main
-
-import (
-	"fmt"
-	"net"
-	"testing"
-
-	"github.com/yudhasubki/netpool"
-)
-
-func TestGenericConnection(t *testing.T) {
-
-	listenConn := NewConnection("127.0.0.1:51337", nil)
-	listener, err := listenConn.Listen()
-	if err != nil {
-		t.Errorf("Error listening: %v\n", err)
-	}
-	pool, err := netpool.New(func() (net.Conn, error) {
-		return net.Dial("tcp", "127.0.0.1:51337")
-	}, netpool.WithMaxPool(128), netpool.WithMinPool(16))
-	if err != nil {
-		t.Errorf("Error creating pool: %v\n", err)
-	}
-	conn := NewConnection("127.0.0.1:51337", pool)
-
-	datta := []byte("Hello, world!")
-	listener.AddHandler(Ping, func(input *FrameWithPayload, resultChan chan<- FrameWithPayload) error {
-		resultChan <- MakeFrameWithPayload(Pong, 200, nil)
-		return nil
-	})
-	listener.AddHandler(1, func(input *FrameWithPayload, resultChan chan<- FrameWithPayload) error {
-		resultChan <- MakeFrameWithPayload(2, 200, datta)
-		return nil
-	})
-	listener.AddHandler(3, func(input *FrameWithPayload, resultChan chan<- FrameWithPayload) error {
-		return fmt.Errorf("Error in custom handler")
-	})
-	r, err := conn.Call(1, datta)
-	if err != nil {
-		t.Errorf("Error calling: %v\n", err)
-	}
-	if r.Type != 2 {
-		t.Errorf("Expected type 2, got %d\n", r.Type)
-	}
-
-	res, err := conn.Call(3, datta)
-	if err != nil {
-		t.Errorf("Did not expect error, got %v\n", err)
-		return
-	}
-	if res.StatusCode == 200 {
-		t.Errorf("Expected error, got %v\n", res)
-	}
-
-	i := 100
-	results := make(chan FrameWithPayload, i)
-	for i > 0 {
-		go conn.CallAsync(1, datta, results)
-		i--
-	}
-	for i < 100 {
-		r := <-results
-		if r.Type != 2 {
-			t.Errorf("Expected type 2, got %d\n", r.Type)
-		}
-		i++
-	}
-
-	response, err := conn.Call(Ping, nil)
-	if err != nil || response.StatusCode != 200 || response.Type != Pong {
-		t.Errorf("Error connecting to remote %v, err: %v\n", response, err)
-	}
-
-}