rapid interations of server side app and firefox extension

backend/app/events.py

@@ -0,0 +1,30 @@
+"""Cross-process event publishing via Redis.
+
+This module provides synchronous event publishing for use in Celery tasks.
+The events are consumed by the WebSocket module which broadcasts them to clients.
+"""
+
+import json
+import redis
+
+from app.config import get_settings
+
+# Redis pub/sub channel for cross-process events
+EVENTS_CHANNEL = "gallery_subscriber:events"
+
+
+def publish_event(event_type: str, data: dict):
+    """Publish an event to Redis (for use in Celery tasks).
+
+    This is a sync function that can be called from Celery tasks.
+    The Quart app subscribes to these events and broadcasts to WebSocket clients.
+
+    Args:
+        event_type: Type of event (e.g., "download.started", "download.completed")
+        data: Event payload data
+    """
+    settings = get_settings()
+    r = redis.from_url(settings.redis_url)
+    message = json.dumps({"type": event_type, "data": data})
+    r.publish(EVENTS_CHANNEL, message)
+    r.close()