Handle blueapi connection error

src/daq_queuing_service/api/errors.py

@@ -1,4 +1,8 @@
-from blueapi.client.rest import InvalidParametersError, UnknownPlanError
+from blueapi.client.rest import (
+    InvalidParametersError,
+    ServiceUnavailableError,
+    UnknownPlanError,
+)
 from fastapi import FastAPI, Request
 from fastapi.responses import JSONResponse
 
@@ -15,6 +19,15 @@
 
 
 def register_exception_handlers(app: FastAPI):
+    @app.exception_handler(ServiceUnavailableError)
+    async def service_unavailable_error(
+        request: Request, exception: ServiceUnavailableError
+    ):
+        return JSONResponse(
+            status_code=409,
+            content={"error": "blueapi_unavailable", "message": str(exception)},
+        )
+
     @app.exception_handler(TaskInProgressError)
     async def task_in_progress_handler(
         request: Request, exception: TaskInProgressError

src/daq_queuing_service/app/app.py

@@ -18,11 +18,6 @@
 
 from ._config import load_config
 
-LOCAL_BLUEAPI_URL = "http://localhost:8000/"
-I15_1_BLUEAPI_URL = "https://i15-1-blueapi.diamond.ac.uk/"
-STOMP_URL = "tcp://localhost:61613"
-
-
 logging.basicConfig(
     level=logging.INFO, format="%(asctime)s [%(name)s] %(levelname)s: %(message)s"
 )