Fix dispatch-cli stream trying to print event as dispatch (frequenz-floss#141)

Author: Marenz

RELEASE_NOTES.md

@@ -3,3 +3,4 @@
 ## Bug Fixes
 
 * Fix that duration=0 was sent & received as None.
+* Fix that `dispatch-cli stream` would try to print an event as dispatch, causing an exception.

src/frequenz/client/dispatch/__main__.py

@@ -11,6 +11,7 @@
 
 import asyncclick as click
 import grpc
+from frequenz.channels import Receiver
 from prompt_toolkit import PromptSession
 from prompt_toolkit.completion import NestedCompleter
 from prompt_toolkit.history import FileHistory
@@ -26,7 +27,7 @@
 )
 from ._client import Client
 from .recurrence import EndCriteria, Frequency, RecurrenceRule, Weekday
-from .types import Dispatch
+from .types import Dispatch, DispatchEvent
 
 DEFAULT_DISPATCH_API_URL = "grpc://fz-0004.frequenz.io:50051"
 
@@ -249,11 +250,15 @@ async def list_(ctx: click.Context, /, **filters: Any) -> None:
 @click.argument("microgrid-id", required=True, type=int)
 async def stream(ctx: click.Context, microgrid_id: int) -> None:
     """Stream dispatches."""
-    async for message in ctx.obj["client"].stream(microgrid_id=microgrid_id):
+    event_stream: Receiver[DispatchEvent] = ctx.obj["client"].stream(
+        microgrid_id=microgrid_id
+    )
+    async for message in event_stream:
         if ctx.obj["raw"]:
             click.echo(pformat(message, compact=True))
         else:
-            print_dispatch(message)
+            print(f"Dispatch {message.event.name.lower()}")
+            print_dispatch(message.dispatch)
 
 
 def parse_recurrence(kwargs: dict[str, Any]) -> RecurrenceRule | None: