Files
go-cart-actor/cmd/cart/pool-server.go
matst80 ea247e2600
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update tests and discovery
2025-11-18 16:40:25 +01:00

674 lines
21 KiB
Go

package main
import (
"bytes"
"context"
"encoding/json"
"fmt"
"log"
"net/http"
"strconv"
"sync"
"time"
"git.tornberg.me/go-cart-actor/pkg/actor"
"git.tornberg.me/go-cart-actor/pkg/cart"
messages "git.tornberg.me/go-cart-actor/pkg/messages"
"git.tornberg.me/go-cart-actor/pkg/voucher"
"git.tornberg.me/mats/go-redis-inventory/pkg/inventory"
"github.com/gogo/protobuf/proto"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"go.opentelemetry.io/contrib/bridges/otelslog"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/trace"
)
var (
grainMutations = promauto.NewCounter(prometheus.CounterOpts{
Name: "cart_grain_mutations_total",
Help: "The total number of mutations",
})
grainLookups = promauto.NewCounter(prometheus.CounterOpts{
Name: "cart_grain_lookups_total",
Help: "The total number of lookups",
})
)
type PoolServer struct {
actor.GrainPool[*cart.CartGrain]
pod_name string
klarnaClient *KlarnaClient
inventoryService inventory.InventoryService
}
func NewPoolServer(pool actor.GrainPool[*cart.CartGrain], pod_name string, klarnaClient *KlarnaClient, inventoryService inventory.InventoryService) *PoolServer {
return &PoolServer{
GrainPool: pool,
pod_name: pod_name,
klarnaClient: klarnaClient,
inventoryService: inventoryService,
}
}
func (s *PoolServer) ApplyLocal(ctx context.Context, id cart.CartId, mutation ...proto.Message) (*actor.MutationResult[*cart.CartGrain], error) {
return s.Apply(ctx, uint64(id), mutation...)
}
func (s *PoolServer) GetCartHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
grain, err := s.Get(r.Context(), uint64(id))
if err != nil {
return err
}
return s.WriteResult(w, grain)
}
func (s *PoolServer) AddSkuToCartHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
sku := r.PathValue("sku")
msg, err := GetItemAddMessage(r.Context(), sku, 1, getCountryFromHost(r.Host), nil)
if err != nil {
return err
}
data, err := s.ApplyLocal(r.Context(), id, msg)
if err != nil {
return err
}
grainMutations.Add(float64(len(data.Mutations)))
return s.WriteResult(w, data)
}
func (s *PoolServer) WriteResult(w http.ResponseWriter, result any) 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 == nil {
w.WriteHeader(http.StatusInternalServerError)
return nil
}
w.WriteHeader(http.StatusOK)
enc := json.NewEncoder(w)
err := enc.Encode(result)
return err
}
func (s *PoolServer) DeleteItemHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
itemIdString := r.PathValue("itemId")
itemId, err := strconv.ParseInt(itemIdString, 10, 64)
if err != nil {
return err
}
data, err := s.ApplyLocal(r.Context(), id, &messages.RemoveItem{Id: uint32(itemId)})
if err != nil {
return err
}
return s.WriteResult(w, data)
}
type SetDeliveryRequest struct {
Provider string `json:"provider"`
Items []uint32 `json:"items"`
PickupPoint *messages.PickupPoint `json:"pickupPoint,omitempty"`
}
func (s *PoolServer) SetDeliveryHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
delivery := SetDeliveryRequest{}
err := json.NewDecoder(r.Body).Decode(&delivery)
if err != nil {
return err
}
data, err := s.ApplyLocal(r.Context(), id, &messages.SetDelivery{
Provider: delivery.Provider,
Items: delivery.Items,
PickupPoint: delivery.PickupPoint,
})
if err != nil {
return err
}
return s.WriteResult(w, data)
}
func (s *PoolServer) SetPickupPointHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
deliveryIdString := r.PathValue("deliveryId")
deliveryId, err := strconv.ParseInt(deliveryIdString, 10, 64)
if err != nil {
return err
}
pickupPoint := messages.PickupPoint{}
err = json.NewDecoder(r.Body).Decode(&pickupPoint)
if err != nil {
return err
}
reply, err := s.ApplyLocal(r.Context(), id, &messages.SetPickupPoint{
DeliveryId: uint32(deliveryId),
Id: pickupPoint.Id,
Name: pickupPoint.Name,
Address: pickupPoint.Address,
City: pickupPoint.City,
Zip: pickupPoint.Zip,
Country: pickupPoint.Country,
})
if err != nil {
return err
}
return s.WriteResult(w, reply)
}
func (s *PoolServer) RemoveDeliveryHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
deliveryIdString := r.PathValue("deliveryId")
deliveryId, err := strconv.Atoi(deliveryIdString)
if err != nil {
return err
}
reply, err := s.ApplyLocal(r.Context(), id, &messages.RemoveDelivery{Id: uint32(deliveryId)})
if err != nil {
return err
}
return s.WriteResult(w, reply)
}
func (s *PoolServer) QuantityChangeHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
changeQuantity := messages.ChangeQuantity{}
err := json.NewDecoder(r.Body).Decode(&changeQuantity)
if err != nil {
return err
}
reply, err := s.ApplyLocal(r.Context(), id, &changeQuantity)
if err != nil {
return err
}
return s.WriteResult(w, reply)
}
type Item struct {
Sku string `json:"sku"`
Quantity int `json:"quantity"`
StoreId *string `json:"storeId,omitempty"`
}
type SetCartItems struct {
Country string `json:"country"`
Items []Item `json:"items"`
}
func getMultipleAddMessages(ctx context.Context, items []Item, country string) []proto.Message {
wg := sync.WaitGroup{}
mu := sync.Mutex{}
msgs := make([]proto.Message, 0, len(items))
for _, itm := range items {
wg.Go(
func() {
msg, err := GetItemAddMessage(ctx, itm.Sku, itm.Quantity, country, itm.StoreId)
if err != nil {
log.Printf("error adding item %s: %v", itm.Sku, err)
return
}
mu.Lock()
msgs = append(msgs, msg)
mu.Unlock()
})
}
wg.Wait()
return msgs
}
func (s *PoolServer) SetCartItemsHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
setCartItems := SetCartItems{}
err := json.NewDecoder(r.Body).Decode(&setCartItems)
if err != nil {
return err
}
msgs := make([]proto.Message, 0, len(setCartItems.Items)+1)
msgs = append(msgs, &messages.ClearCartRequest{})
msgs = append(msgs, getMultipleAddMessages(r.Context(), setCartItems.Items, setCartItems.Country)...)
reply, err := s.ApplyLocal(r.Context(), id, msgs...)
if err != nil {
return err
}
return s.WriteResult(w, reply)
}
func (s *PoolServer) AddMultipleItemHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
setCartItems := SetCartItems{}
err := json.NewDecoder(r.Body).Decode(&setCartItems)
if err != nil {
return err
}
reply, err := s.ApplyLocal(r.Context(), id, getMultipleAddMessages(r.Context(), setCartItems.Items, setCartItems.Country)...)
if err != nil {
return err
}
return s.WriteResult(w, reply)
}
type AddRequest struct {
Sku string `json:"sku"`
Quantity int32 `json:"quantity"`
Country string `json:"country"`
StoreId *string `json:"storeId"`
}
func (s *PoolServer) AddSkuRequestHandler(w http.ResponseWriter, r *http.Request, id cart.CartId) error {
addRequest := AddRequest{Quantity: 1}
err := json.NewDecoder(r.Body).Decode(&addRequest)
if err != nil {
return err
}
msg, err := GetItemAddMessage(r.Context(), addRequest.Sku, int(addRequest.Quantity), addRequest.Country, addRequest.StoreId)
if err != nil {
return err
}
reply, err := s.ApplyLocal(r.Context(), id, msg)
if err != nil {
return err
}
return s.WriteResult(w, reply)
}
// func (s *PoolServer) HandleConfirmation(w http.ResponseWriter, r *http.Request, id CartId) error {
// orderId := r.PathValue("orderId")
// if orderId == "" {
// return fmt.Errorf("orderId is empty")
// }
// order, err := KlarnaInstance.GetOrder(orderId)
// 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)
// return json.NewEncoder(w).Encode(order)
// }
func getCurrency(country string) string {
if country == "no" {
return "NOK"
}
return "SEK"
}
func getLocale(country string) string {
if country == "no" {
return "nb-no"
}
return "sv-se"
}
func getLocationId(item *cart.CartItem) inventory.LocationID {
if item.StoreId == nil || *item.StoreId == "" {
return "se"
}
return inventory.LocationID(*item.StoreId)
}
func getInventoryRequests(items []*cart.CartItem) []inventory.ReserveRequest {
var requests []inventory.ReserveRequest
for _, item := range items {
if item == nil {
continue
}
requests = append(requests, inventory.ReserveRequest{
SKU: inventory.SKU(item.Sku),
LocationID: getLocationId(item),
Quantity: uint32(item.Quantity),
})
}
return requests
}
func (s *PoolServer) CreateOrUpdateCheckout(r *http.Request, id cart.CartId) (*CheckoutOrder, error) {
country := getCountryFromHost(r.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),
Country: country,
Currency: getCurrency(country),
Locale: getLocale(country),
}
// Get current grain state (may be local or remote)
grain, err := s.Get(r.Context(), uint64(id))
if err != nil {
return nil, err
}
if s.inventoryService != nil {
inventoryRequests := getInventoryRequests(grain.Items)
failingRequest, err := s.inventoryService.ReservationCheck(r.Context(), inventoryRequests...)
if err != nil {
logger.WarnContext(r.Context(), "inventory check failed", string(failingRequest.SKU), string(failingRequest.LocationID))
return nil, err
}
}
// Build pure checkout payload
payload, _, err := BuildCheckoutOrderPayload(grain, meta)
if err != nil {
return nil, err
}
if grain.OrderReference != "" {
return s.klarnaClient.UpdateOrder(r.Context(), grain.OrderReference, bytes.NewReader(payload))
} else {
return s.klarnaClient.CreateOrder(r.Context(), bytes.NewReader(payload))
}
}
func (s *PoolServer) ApplyCheckoutStarted(ctx context.Context, klarnaOrder *CheckoutOrder, id cart.CartId) (*actor.MutationResult[*cart.CartGrain], error) {
// Persist initialization state via mutation (best-effort)
return s.ApplyLocal(ctx, id, &messages.InitializeCheckout{
OrderId: klarnaOrder.ID,
Status: klarnaOrder.Status,
PaymentInProgress: true,
})
}
// func (s *PoolServer) HandleCheckout(w http.ResponseWriter, r *http.Request, id CartId) error {
// klarnaOrder, err := s.CreateOrUpdateCheckout(r.Host, id)
// if err != nil {
// return err
// }
// s.ApplyCheckoutStarted(klarnaOrder, id)
// w.Header().Set("Content-Type", "application/json")
// return json.NewEncoder(w).Encode(klarnaOrder)
// }
//
func CookieCartIdHandler(fn func(cartId cart.CartId, w http.ResponseWriter, r *http.Request) error) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
var id cart.CartId
cookie, err := r.Cookie("cartid")
if err != nil || cookie.Value == "" {
id = cart.MustNewCartId()
http.SetCookie(w, &http.Cookie{
Name: "cartid",
Value: id.String(),
Secure: r.TLS != nil,
HttpOnly: true,
Path: "/",
Expires: time.Now().AddDate(0, 0, 14),
SameSite: http.SameSiteLaxMode,
})
w.Header().Set("Set-Cart-Id", id.String())
} else {
parsed, ok := cart.ParseCartId(cookie.Value)
if !ok {
id = cart.MustNewCartId()
http.SetCookie(w, &http.Cookie{
Name: "cartid",
Value: id.String(),
Secure: r.TLS != nil,
HttpOnly: true,
Path: "/",
Expires: time.Now().AddDate(0, 0, 14),
SameSite: http.SameSiteLaxMode,
})
w.Header().Set("Set-Cart-Id", id.String())
} else {
id = parsed
}
}
err = fn(id, w, r)
if err != nil {
log.Printf("Server error, not remote error: %v\n", err)
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
}
}
}
// Removed leftover legacy block after CookieCartIdHandler (obsolete code referencing cid/legacy)
func (s *PoolServer) RemoveCartCookie(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error {
// Clear cart cookie (breaking change: do not issue a new legacy id here)
http.SetCookie(w, &http.Cookie{
Name: "cartid",
Value: "",
Path: "/",
Secure: r.TLS != nil,
HttpOnly: true,
Expires: time.Unix(0, 0),
SameSite: http.SameSiteLaxMode,
})
w.WriteHeader(http.StatusOK)
return nil
}
func CartIdHandler(fn func(cartId cart.CartId, w http.ResponseWriter, r *http.Request) error) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
var id cart.CartId
raw := r.PathValue("id")
// If no id supplied, generate a new one
if raw == "" {
id := cart.MustNewCartId()
w.Header().Set("Set-Cart-Id", id.String())
} else {
// Parse base62 cart id
if parsedId, ok := cart.ParseCartId(raw); !ok {
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte("cart id is invalid"))
return
} else {
id = parsedId
}
}
err := fn(id, w, r)
if err != nil {
log.Printf("Server error, not remote error: %v\n", err)
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
}
}
}
func (s *PoolServer) ProxyHandler(fn func(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error) func(cartId cart.CartId, w http.ResponseWriter, r *http.Request) error {
return func(cartId cart.CartId, w http.ResponseWriter, r *http.Request) error {
if ownerHost, ok := s.OwnerHost(uint64(cartId)); ok {
ctx, span := tracer.Start(r.Context(), "proxy")
defer span.End()
span.SetAttributes(attribute.String("cartid", cartId.String()))
hostAttr := attribute.String("other host", ownerHost.Name())
span.SetAttributes(hostAttr)
logger.InfoContext(ctx, "cart proxyed", "result", ownerHost.Name())
proxyCalls.Add(ctx, 1, metric.WithAttributes(hostAttr))
handled, err := ownerHost.Proxy(uint64(cartId), w, r)
grainLookups.Inc()
if err == nil && handled {
return nil
}
}
_, span := tracer.Start(r.Context(), "own")
span.SetAttributes(attribute.String("cartid", cartId.String()))
defer span.End()
return fn(w, r, cartId)
}
}
var (
tracer = otel.Tracer(name)
meter = otel.Meter(name)
logger = otelslog.NewLogger(name)
proxyCalls metric.Int64Counter
// rollCnt metric.Int64Counter
)
func init() {
var err error
proxyCalls, err = meter.Int64Counter("proxy.calls",
metric.WithDescription("Number of proxy calls"),
metric.WithUnit("{calls}"))
if err != nil {
panic(err)
}
}
type AddVoucherRequest struct {
VoucherCode string `json:"code"`
}
func (s *PoolServer) AddVoucherHandler(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error {
data := &AddVoucherRequest{}
json.NewDecoder(r.Body).Decode(data)
v := voucher.Service{}
msg, err := v.GetVoucher(data.VoucherCode)
if err != nil {
s.ApplyLocal(r.Context(), cartId, &messages.PreConditionFailed{
Operation: "AddVoucher",
Error: err.Error(),
})
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return err
}
reply, err := s.ApplyLocal(r.Context(), cartId, msg)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return err
}
s.WriteResult(w, reply)
return nil
}
func (s *PoolServer) SubscriptionDetailsHandler(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error {
data := &messages.UpsertSubscriptionDetails{}
err := json.NewDecoder(r.Body).Decode(data)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return err
}
reply, err := s.ApplyLocal(r.Context(), cartId, data)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return err
}
s.WriteResult(w, reply)
return nil
}
func (s *PoolServer) CheckoutHandler(fn func(order *CheckoutOrder, w http.ResponseWriter) error) func(w http.ResponseWriter, r *http.Request) {
return CookieCartIdHandler(s.ProxyHandler(func(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error {
orderId := r.URL.Query().Get("order_id")
if orderId == "" {
order, err := s.CreateOrUpdateCheckout(r, cartId)
if err != nil {
logger.Error("unable to create klarna session", "error", err)
return err
}
s.ApplyCheckoutStarted(r.Context(), order, cartId)
return fn(order, w)
}
order, err := s.klarnaClient.GetOrder(r.Context(), orderId)
if err != nil {
return err
}
return fn(order, w)
}))
}
func (s *PoolServer) RemoveVoucherHandler(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error {
idStr := r.PathValue("voucherId")
id, err := strconv.ParseInt(idStr, 10, 64)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return err
}
reply, err := s.ApplyLocal(r.Context(), cartId, &messages.RemoveVoucher{Id: uint32(id)})
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
return err
}
s.WriteResult(w, reply)
return nil
}
func (s *PoolServer) Serve(mux *http.ServeMux) {
// mux.HandleFunc("OPTIONS /cart", func(w http.ResponseWriter, r *http.Request) {
// w.Header().Set("Access-Control-Allow-Origin", "*")
// w.Header().Set("Access-Control-Allow-Methods", "GET, PUT, POST, DELETE")
// w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
// w.WriteHeader(http.StatusOK)
// })
handleFunc := func(pattern string, handlerFunc func(http.ResponseWriter, *http.Request)) {
attr := attribute.String("http.route", pattern)
mux.HandleFunc(pattern, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
span := trace.SpanFromContext(r.Context())
span.SetName(pattern)
span.SetAttributes(attr)
labeler, _ := otelhttp.LabelerFromContext(r.Context())
labeler.Add(attr)
handlerFunc(w, r)
}))
}
handleFunc("GET /cart", CookieCartIdHandler(s.ProxyHandler(s.GetCartHandler)))
handleFunc("GET /cart/add/{sku}", CookieCartIdHandler(s.ProxyHandler(s.AddSkuToCartHandler)))
handleFunc("POST /cart/add", CookieCartIdHandler(s.ProxyHandler(s.AddMultipleItemHandler)))
handleFunc("POST /cart", CookieCartIdHandler(s.ProxyHandler(s.AddSkuRequestHandler)))
handleFunc("POST /cart/set", CookieCartIdHandler(s.ProxyHandler(s.SetCartItemsHandler)))
handleFunc("DELETE /cart/{itemId}", CookieCartIdHandler(s.ProxyHandler(s.DeleteItemHandler)))
handleFunc("PUT /cart", CookieCartIdHandler(s.ProxyHandler(s.QuantityChangeHandler)))
handleFunc("DELETE /cart", CookieCartIdHandler(s.ProxyHandler(s.RemoveCartCookie)))
handleFunc("POST /cart/delivery", CookieCartIdHandler(s.ProxyHandler(s.SetDeliveryHandler)))
handleFunc("DELETE /cart/delivery/{deliveryId}", CookieCartIdHandler(s.ProxyHandler(s.RemoveDeliveryHandler)))
handleFunc("PUT /cart/delivery/{deliveryId}/pickupPoint", CookieCartIdHandler(s.ProxyHandler(s.SetPickupPointHandler)))
handleFunc("PUT /cart/voucher", CookieCartIdHandler(s.ProxyHandler(s.AddVoucherHandler)))
handleFunc("PUT /cart/subscription-details", CookieCartIdHandler(s.ProxyHandler(s.SubscriptionDetailsHandler)))
handleFunc("DELETE /cart/voucher/{voucherId}", CookieCartIdHandler(s.ProxyHandler(s.RemoveVoucherHandler)))
//mux.HandleFunc("GET /cart/checkout", CookieCartIdHandler(s.ProxyHandler(s.HandleCheckout)))
//mux.HandleFunc("GET /cart/confirmation/{orderId}", CookieCartIdHandler(s.ProxyHandler(s.HandleConfirmation)))
handleFunc("GET /cart/byid/{id}", CartIdHandler(s.ProxyHandler(s.GetCartHandler)))
handleFunc("GET /cart/byid/{id}/add/{sku}", CartIdHandler(s.ProxyHandler(s.AddSkuToCartHandler)))
handleFunc("POST /cart/byid/{id}", CartIdHandler(s.ProxyHandler(s.AddSkuRequestHandler)))
handleFunc("DELETE /cart/byid/{id}/{itemId}", CartIdHandler(s.ProxyHandler(s.DeleteItemHandler)))
handleFunc("PUT /cart/byid/{id}", CartIdHandler(s.ProxyHandler(s.QuantityChangeHandler)))
handleFunc("POST /cart/byid/{id}/delivery", CartIdHandler(s.ProxyHandler(s.SetDeliveryHandler)))
handleFunc("DELETE /cart/byid/{id}/delivery/{deliveryId}", CartIdHandler(s.ProxyHandler(s.RemoveDeliveryHandler)))
handleFunc("PUT /cart/byid/{id}/delivery/{deliveryId}/pickupPoint", CartIdHandler(s.ProxyHandler(s.SetPickupPointHandler)))
handleFunc("PUT /cart/byid/{id}/voucher", CookieCartIdHandler(s.ProxyHandler(s.AddVoucherHandler)))
handleFunc("DELETE /cart/byid/{id}/voucher/{voucherId}", CookieCartIdHandler(s.ProxyHandler(s.RemoveVoucherHandler)))
//mux.HandleFunc("GET /cart/byid/{id}/checkout", CartIdHandler(s.ProxyHandler(s.HandleCheckout)))
//mux.HandleFunc("GET /cart/byid/{id}/confirmation", CartIdHandler(s.ProxyHandler(s.HandleConfirmation)))
}