sending notifications about new stacks

backend/events.go

@@ -19,13 +19,63 @@ import (
 	"github.com/lib/pq"
 )
 
-type Notification struct {
+const (
+	IMAGE_TYPE = "image"
+	LIST_TYPE  = "list"
+)
+
+type imageNotification struct {
+	Type string
+
 	ImageID   uuid.UUID
 	ImageName string
-	Status    string
+
+	Status string
 }
 
-func ListenNewImageEvents(db *sql.DB, notifier *Notifier[Notification]) {
+type listNotification struct {
+	Type string
+
+	ListID uuid.UUID
+	Name   string
+
+	Status string
+}
+
+type Notification struct {
+	image *imageNotification
+	list  *listNotification
+}
+
+func getImageNotification(image imageNotification) Notification {
+	return Notification{
+		image: &image,
+	}
+}
+
+func getListNotification(list listNotification) Notification {
+	return Notification{
+		list: &list,
+	}
+}
+
+func (n Notification) MarshalJSON() ([]byte, error) {
+	if n.image != nil {
+		return json.Marshal(n.image)
+	}
+
+	if n.list != nil {
+		return json.Marshal(n.list)
+	}
+
+	return nil, fmt.Errorf("no image or list present")
+}
+
+func (n *Notification) UnmarshalJSON(data []byte) error {
+	return fmt.Errorf("unimplemented")
+}
+
+func ListenNewImageEvents(db *sql.DB) {
 	listener := pq.NewListener(os.Getenv("DB_CONNECTION"), time.Second, time.Second, func(event pq.ListenerEventType, err error) {
 		if err != nil {
 			panic(err)
@@ -128,11 +178,12 @@ func ListenProcessingImageStatus(db *sql.DB, images models.ImageModel, notifier
 
 		logger.Info("Update", "id", imageStringUuid, "status", status)
 
-		notification := Notification{
+		notification := getImageNotification(imageNotification{
+			Type:      IMAGE_TYPE,
 			ImageID:   processingImage.ImageID,
 			ImageName: processingImage.Image.ImageName,
 			Status:    status,
-		}
+		})
 
 		if err := notifier.SendAndCreate(processingImage.UserID.String(), notification); err != nil {
 			logger.Error(err)
@@ -191,6 +242,51 @@ func ListenNewStackEvents(db *sql.DB) {
 	}
 }
 
+func ListenProcessingStackStatus(db *sql.DB, stacks models.ListModel, notifier *Notifier[Notification]) {
+	listener := pq.NewListener(os.Getenv("DB_CONNECTION"), time.Second, time.Second, func(event pq.ListenerEventType, err error) {
+		if err != nil {
+			panic(err)
+		}
+	})
+	defer listener.Close()
+
+	logger := createLogger("Stack Status 📊", os.Stdout)
+
+	if err := listener.Listen("new_processing_stack_status"); err != nil {
+		panic(err)
+	}
+
+	for data := range listener.Notify {
+		stackStringUUID := data.Extra[0:36]
+		status := data.Extra[36:]
+
+		stackUUID, err := uuid.Parse(stackStringUUID)
+		if err != nil {
+			logger.Error(err)
+			continue
+		}
+
+		processingStack, err := stacks.GetToProcess(context.Background(), stackUUID)
+		if err != nil {
+			logger.Error("GetToProcess failed", "err", err)
+			continue
+		}
+
+		logger.Info("Update", "id", stackStringUUID, "status", status)
+
+		notification := getListNotification(listNotification{
+			Type:   LIST_TYPE,
+			Name:   processingStack.Title,
+			ListID: stackUUID,
+			Status: status,
+		})
+
+		if err := notifier.SendAndCreate(processingStack.UserID.String(), notification); err != nil {
+			logger.Error(err)
+		}
+	}
+}
+
 /*
  * TODO: We have channels open every a user sends an image.
  * We never close these channels.
@@ -251,7 +347,8 @@ func CreateEventsHandler(notifier *Notifier[Notification]) http.HandlerFunc {
 					return
 				}
 
-				fmt.Printf("Sending msg %s\n", msg)
+				fmt.Printf("Sending msg %s\n", msgString)
+
 				fmt.Fprintf(w, "event: data\ndata: %s\n\n", string(msgString))
 				w.(http.Flusher).Flush()
 			}

backend/main.go

@@ -28,6 +28,7 @@ func (client TestAiClient) GetImageInfo(imageName string, imageData []byte) (cli
 
 func setupRouter(db *sql.DB) chi.Router {
 	imageModel := models.NewImageModel(db)
+	stackModel := models.NewListModel(db)
 
 	stackHandler := stacks.CreateStackHandler(db)
 	authHandler := auth.CreateAuthHandler(db)
@@ -37,9 +38,15 @@ func setupRouter(db *sql.DB) chi.Router {
 
 	// Only start event listeners if not in test environment
 	if os.Getenv("GO_TEST_ENVIRONMENT") != "true" {
-		go ListenNewImageEvents(db, &notifier)
+
+		// TODO: should extract these into a notification manager
+		// And actually make them the same code.
+		// The events are basically the same.
+
+		go ListenNewImageEvents(db)
 		go ListenProcessingImageStatus(db, imageModel, &notifier)
 		go ListenNewStackEvents(db)
+		go ListenProcessingStackStatus(db, stackModel, &notifier)
 	}
 
 	r := chi.NewRouter()

backend/models/lists.go

@@ -92,6 +92,21 @@ func (m ListModel) GetProcessing(ctx context.Context, processingListID uuid.UUID
 	return list, err
 }
 
+func (m ListModel) GetToProcess(ctx context.Context, listID uuid.UUID) (model.ProcessingLists, error) {
+	getToProcessStmt := ProcessingLists.
+		SELECT(ProcessingLists.AllColumns).
+		WHERE(ProcessingLists.ID.EQ(UUID(listID)))
+
+	stack := []model.ProcessingLists{}
+	err := getToProcessStmt.QueryContext(ctx, m.dbPool, &stack)
+
+	if len(stack) != 1 {
+		return model.ProcessingLists{}, fmt.Errorf("Expected 1, got %d\n", len(stack))
+	}
+
+	return stack[0], err
+}
+
 // ========================================
 // UPDATE
 // ========================================

backend/schema.sql

@@ -124,6 +124,14 @@ PERFORM pg_notify('new_stack', NEW.id::text);
 END
 $$ LANGUAGE plpgsql;
 
+CREATE OR REPLACE FUNCTION notify_new_processing_stack_status()
+RETURNS TRIGGER AS $$
+BEGIN
+PERFORM pg_notify('new_processing_stack_status', NEW.id::text || NEW.status::text);
+	RETURN NEW;
+END
+$$ LANGUAGE plpgsql;
+
 /* -----| Triggers |----- */
 
 CREATE OR REPLACE TRIGGER on_new_image AFTER INSERT
@@ -142,4 +150,10 @@ ON haystack.processing_lists
 FOR EACH ROW
 EXECUTE PROCEDURE notify_new_stacks();
 
+CREATE OR REPLACE TRIGGER on_update_stack_progress 
+AFTER UPDATE OF status
+ON haystack.processing_lists
+FOR EACH ROW
+EXECUTE PROCEDURE notify_new_processing_stack_status();
+
 /* -----| Test Data |----- */