fix topic publishing (#195)

copied code from before fastAPI change in service/app.py to re-establish the same subscriptions on the worker

src/blueapi/service/handler.py

@@ -1,8 +1,9 @@
 import logging
-from typing import Optional
+from typing import Mapping, Optional
 
 from blueapi.config import ApplicationConfig
 from blueapi.core import BlueskyContext
+from blueapi.core.event import EventStream
 from blueapi.messaging import StompMessagingTemplate
 from blueapi.messaging.base import MessagingTemplate
 from blueapi.worker.reworker import RunEngineWorker
@@ -29,19 +30,35 @@ def __init__(self, config: Optional[ApplicationConfig] = None) -> None:
     def start(self) -> None:
         self.worker.start()
 
-        self.worker.data_events.subscribe(
-            lambda event, corr_id: self.message_bus.send(
-                "public.worker.event.data", event, None, corr_id
-            )
-        )
-        self.worker.progress_events.subscribe(
-            lambda event, corr_id: self.message_bus.send(
-                "public.worker.event.progress", event, None, corr_id
-            )
+        self._publish_event_streams(
+            {
+                self.worker.worker_events: self.message_bus.destinations.topic(
+                    "public.worker.event"
+                ),
+                self.worker.progress_events: self.message_bus.destinations.topic(
+                    "public.worker.event.progress"
+                ),
+                self.worker.data_events: self.message_bus.destinations.topic(
+                    "public.worker.event.data"
+                ),
+            }
         )
 
         self.message_bus.connect()
 
+    def _publish_event_streams(
+        self, streams_to_destinations: Mapping[EventStream, str]
+    ) -> None:
+        for stream, destination in streams_to_destinations.items():
+            self._publish_event_stream(stream, destination)
+
+    def _publish_event_stream(self, stream: EventStream, destination: str) -> None:
+        stream.subscribe(
+            lambda event, correlation_id: self.message_bus.send(
+                destination, event, None, correlation_id
+            )
+        )
+
     def stop(self) -> None:
         self.worker.stop()
         self.message_bus.disconnect()