fix: remove infinite loop in subscription causing high cpu

.env.example

@@ -2,6 +2,7 @@ DATABASE_URI=file:nwc.db
 NOSTR_PRIVKEY=
 COOKIE_SECRET=secretsecret
 RELAY=wss://relay.getalby.com/v1
+#RELAY=ws://localhost:7447/v1
 PUBLIC_RELAY=
 PORT=8080
 

service.go

@@ -54,86 +54,91 @@ func (svc *Service) GetUser(c echo.Context) (user *User, err error) {
 }
 
 func (svc *Service) StartSubscription(ctx context.Context, sub *nostr.Subscription) error {
-	for {
-		if sub.Relay.ConnectionError != nil {
-			return sub.Relay.ConnectionError
-		}
-		select {
-		case <-ctx.Done():
-			svc.Logger.Info("Exiting subscription.")
-			return nil
-		case <-sub.EndOfStoredEvents:
-			if !svc.ReceivedEOS {
-				svc.Logger.Info("Received EOS")
+	go func() {
+		<-sub.EndOfStoredEvents
+		svc.ReceivedEOS = true
+		svc.Logger.Info("Received EOS")
+	}()
+
+	go func() {
+		for event := range sub.Events {
+			resp, err := svc.HandleEvent(ctx, event)
+			if err != nil {
+				svc.Logger.WithFields(logrus.Fields{
+					"eventId":   event.ID,
+					"eventKind": event.Kind,
+				}).Errorf("Failed to process event: %v", err)
 			}
-			svc.ReceivedEOS = true
-		case event := <-sub.Events:
-			go func() {
-				resp, err := svc.HandleEvent(ctx, event)
+			if resp != nil {
+				status, err := sub.Relay.Publish(ctx, *resp)
 				if err != nil {
 					svc.Logger.WithFields(logrus.Fields{
-						"eventId":   event.ID,
-						"eventKind": event.Kind,
-					}).Errorf("Failed to process event: %v", err)
+						"eventId":      event.ID,
+						"status":       status,
+						"replyEventId": resp.ID,
+					}).Errorf("Failed to publish reply: %v", err)
+					return
 				}
-				if resp != nil {
-					status, err := sub.Relay.Publish(ctx, *resp)
-					if err != nil {
-						svc.Logger.WithFields(logrus.Fields{
-							"eventId":      event.ID,
-							"status":       status,
-							"replyEventId": resp.ID,
-						}).Errorf("Failed to publish reply: %v", err)
-						return
-					}
 
-					nostrEvent := NostrEvent{}
-					result := svc.db.Where("nostr_id = ?", event.ID).First(&nostrEvent)
-					if result.Error != nil {
-						svc.Logger.WithFields(logrus.Fields{
-							"eventId":      event.ID,
-							"status":       status,
-							"replyEventId": resp.ID,
-						}).Error(result.Error)
-						return
-					}
-					nostrEvent.ReplyId = resp.ID
+				nostrEvent := NostrEvent{}
+				result := svc.db.Where("nostr_id = ?", event.ID).First(&nostrEvent)
+				if result.Error != nil {
+					svc.Logger.WithFields(logrus.Fields{
+						"eventId":      event.ID,
+						"status":       status,
+						"replyEventId": resp.ID,
+					}).Error(result.Error)
+					return
+				}
+				nostrEvent.ReplyId = resp.ID
 
-					if status == nostr.PublishStatusSucceeded {
-						nostrEvent.State = NOSTR_EVENT_STATE_PUBLISH_CONFIRMED
-						nostrEvent.RepliedAt = time.Now()
-						svc.db.Save(&nostrEvent)
-						svc.Logger.WithFields(logrus.Fields{
-							"nostrEventId": nostrEvent.ID,
-							"eventId":      event.ID,
-							"status":       status,
-							"replyEventId": resp.ID,
-							"appId":        nostrEvent.AppId,
-						}).Info("Published reply")
-					} else if status == nostr.PublishStatusFailed {
-						nostrEvent.State = NOSTR_EVENT_STATE_PUBLISH_FAILED
-						svc.db.Save(&nostrEvent)
-						svc.Logger.WithFields(logrus.Fields{
-							"nostrEventId": nostrEvent.ID,
-							"eventId":      event.ID,
-							"status":       status,
-							"replyEventId": resp.ID,
-							"appId":        nostrEvent.AppId,
-						}).Info("Failed to publish reply")
-					} else {
-						nostrEvent.State = NOSTR_EVENT_STATE_PUBLISH_UNCONFIRMED
-						svc.db.Save(&nostrEvent)
-						svc.Logger.WithFields(logrus.Fields{
-							"nostrEventId": nostrEvent.ID,
-							"eventId":      event.ID,
-							"status":       status,
-							"replyEventId": resp.ID,
-							"appId":        nostrEvent.AppId,
-						}).Info("Reply sent but no response from relay (timeout)")
-					}
+				if status == nostr.PublishStatusSucceeded {
+					nostrEvent.State = NOSTR_EVENT_STATE_PUBLISH_CONFIRMED
+					nostrEvent.RepliedAt = time.Now()
+					svc.db.Save(&nostrEvent)
+					svc.Logger.WithFields(logrus.Fields{
+						"nostrEventId": nostrEvent.ID,
+						"eventId":      event.ID,
+						"status":       status,
+						"replyEventId": resp.ID,
+						"appId":        nostrEvent.AppId,
+					}).Info("Published reply")
+				} else if status == nostr.PublishStatusFailed {
+					nostrEvent.State = NOSTR_EVENT_STATE_PUBLISH_FAILED
+					svc.db.Save(&nostrEvent)
+					svc.Logger.WithFields(logrus.Fields{
+						"nostrEventId": nostrEvent.ID,
+						"eventId":      event.ID,
+						"status":       status,
+						"replyEventId": resp.ID,
+						"appId":        nostrEvent.AppId,
+					}).Info("Failed to publish reply")
+				} else {
+					nostrEvent.State = NOSTR_EVENT_STATE_PUBLISH_UNCONFIRMED
+					svc.db.Save(&nostrEvent)
+					svc.Logger.WithFields(logrus.Fields{
+						"nostrEventId": nostrEvent.ID,
+						"eventId":      event.ID,
+						"status":       status,
+						"replyEventId": resp.ID,
+						"appId":        nostrEvent.AppId,
+					}).Info("Reply sent but no response from relay (timeout)")
 				}
-			}()
+			}
+		}
+	}()
+
+	select {
+	case <-sub.Relay.Context().Done():
+		svc.Logger.Errorf("Relay error %v", sub.Relay.ConnectionError)
+		return sub.Relay.ConnectionError
+	case <-ctx.Done():
+		if ctx.Err() != context.Canceled {
+			svc.Logger.Errorf("Subscription error %v", ctx.Err())
+			return ctx.Err()
 		}
+		svc.Logger.Info("Exiting subscription.")
+		return nil
 	}
 }