add proper pubsub

controllers/invoicestream.ctrl.go

@@ -33,7 +33,8 @@ func (controller *InvoiceStreamController) StreamInvoices(c echo.Context) error
 		return err
 	}
 	invoiceChan := make(chan models.Invoice)
-	controller.svc.InvoiceSubscribers[userId] = invoiceChan
+	reqId := c.Response().Header().Get(echo.HeaderXRequestID)
+	controller.svc.InvoicePubSub.Subscribe(reqId, userId, invoiceChan)
 	ctx := c.Request().Context()
 	upgrader := websocket.Upgrader{}
 	upgrader.CheckOrigin = func(r *http.Request) bool { return true }
@@ -80,5 +81,6 @@ SocketLoop:
 			}
 		}
 	}
+	controller.svc.InvoicePubSub.Unsubscribe(reqId, userId)
 	return nil
 }

lib/service/invoicesubscription.go

@@ -97,9 +97,7 @@ func (svc *LndhubService) ProcessInvoiceUpdate(ctx context.Context, rawInvoice *
 		svc.Logger.Errorf("Failed to commit DB transaction user_id:%v invoice_id:%v  %v", invoice.UserID, invoice.ID, err)
 		return err
 	}
-	if sub, ok := svc.InvoiceSubscribers[invoice.UserID]; ok {
+	svc.InvoicePubSub.Publish(invoice.UserID, invoice)
-		sub <- invoice
-	}
 
 	return nil
 }

lib/service/pubsub.go

@@ -0,0 +1,48 @@
+package service
+
+import (
+	"sync"
+
+	"github.com/getAlby/lndhub.go/db/models"
+)
+
+type Pubsub struct {
+	mu   sync.RWMutex
+	subs map[int64]map[string]chan models.Invoice
+}
+
+func NewPubsub() *Pubsub {
+	ps := &Pubsub{}
+	ps.subs = make(map[int64]map[string]chan models.Invoice)
+	return ps
+}
+
+func (ps *Pubsub) Subscribe(id string, topic int64, ch chan models.Invoice) {
+	ps.mu.Lock()
+	defer ps.mu.Unlock()
+
+	ps.subs[topic][id] = ch
+}
+
+func (ps *Pubsub) Unsubscribe(id string, topic int64) {
+	ps.mu.Lock()
+	defer ps.mu.Unlock()
+	delete(ps.subs[topic], id)
+}
+
+func (ps *Pubsub) Publish(topic int64, msg models.Invoice) {
+	ps.mu.RLock()
+	defer ps.mu.RUnlock()
+
+	for _, ch := range ps.subs[topic] {
+		ch <- msg
+	}
+}
+
+func (ps *Pubsub) CloseAll() {
+	for _, subs := range ps.subs {
+		for _, ch := range subs {
+			close(ch)
+		}
+	}
+}

lib/service/service.go

@@ -22,7 +22,7 @@ type LndhubService struct {
 	LndClient      lnd.LightningClientWrapper
 	Logger         *lecho.Logger
 	IdentityPubkey string
-	InvoiceSubscribers map[int64]chan models.Invoice
+	InvoicePubSub  *Pubsub
 }
 
 func (svc *LndhubService) GenerateToken(ctx context.Context, login, password, inRefreshToken string) (accessToken, refreshToken string, err error) {

main.go

@@ -15,7 +15,6 @@ import (
 	"github.com/getAlby/lndhub.go/controllers"
 	"github.com/getAlby/lndhub.go/db"
 	"github.com/getAlby/lndhub.go/db/migrations"
-	"github.com/getAlby/lndhub.go/db/models"
 	"github.com/getAlby/lndhub.go/lib"
 	"github.com/getAlby/lndhub.go/lib/responses"
 	"github.com/getAlby/lndhub.go/lib/service"
@@ -124,7 +123,7 @@ func main() {
 		LndClient:      lndClient,
 		Logger:         logger,
 		IdentityPubkey: getInfo.IdentityPubkey,
-		InvoiceSubscribers: map[int64]chan models.Invoice{},
+		InvoicePubSub:  service.NewPubsub(),
 	}
 
 	strictRateLimitMiddleware := createRateLimitMiddleware(c.StrictRateLimit, c.BurstRateLimit)
@@ -204,9 +203,7 @@ func main() {
 		e.Logger.Fatal(err)
 	}
 	//close all channels
-	for _, sub := range svc.InvoiceSubscribers {
+	svc.InvoicePubSub.CloseAll()
-		close(sub)
-	}
 	if echoPrometheus != nil {
 		if err := echoPrometheus.Shutdown(ctx); err != nil {
 			e.Logger.Fatal(err)