Fix handling of unexpected exceptions in GrpcStreamBroadcaster (frequenz-floss#143)

`GrpcStreamBroadcaster` will now correctly try to restart on unexpected
errors.

Before if an unexpected exception was raised by the stream method, the
internal task would silently finish and never start again.

Author: llucax

RELEASE_NOTES.md

@@ -2,8 +2,8 @@
 
 ## Features
 
-* Added support for HMAC signing of UnaryUnary client messages
-* Added support for HMAC signing of UnaryStream client messages
+* Added support for HMAC signing of `UnaryUnary` client messages
+* Added support for HMAC signing of `UnaryStream` client messages
 
 ## Upgrading
 
@@ -14,3 +14,7 @@
 ## Bug Fixes
 
 * Fixed keys of signature to match what fuse-rs expects
+* `GrpcStreamBroadcaster` will now correctly try to restart on unexpected errors.
+
+    Before if an unexpected exception was raised by the stream method, the
+    internal task would silently finish and never start again.

src/frequenz/client/base/streaming.py

@@ -111,6 +111,12 @@ async def _run(self) -> None:
                     await sender.send(self._transform(msg))
             except grpc.aio.AioRpcError as err:
                 error = err
+            except Exception as err:  # pylint: disable=broad-except
+                _logger.exception(
+                    "%s: raise an unexpected exception",
+                    self._stream_name,
+                )
+                error = err
             if error is None and not self._retry_on_exhausted_stream:
                 _logger.info(
                     "%s: connection closed, stream exhausted", self._stream_name