Update base client to v0.8.0

pyproject.toml

@@ -33,7 +33,7 @@ dependencies = [
   "grpcio >= 1.54.2, < 2",
   "grpcio-tools >= 1.54.2, < 2",
   "protobuf >= 4.25.3, < 6",
-  "frequenz-client-base >= 0.6.0, < 0.7.0",
+  "frequenz-client-base >= 0.8.0, < 0.9.0",
 ]
 dynamic = ["version"]
 

src/frequenz/client/reporting/_client.py

@@ -28,6 +28,7 @@
 from frequenz.api.reporting.v1.reporting_pb2 import TimeFilter as PBTimeFilter
 from frequenz.api.reporting.v1.reporting_pb2_grpc import ReportingStub
 from frequenz.client.base.client import BaseApiClient
+from frequenz.client.base.exception import ClientNotConnected
 from frequenz.client.common.metric import Metric
 from google.protobuf.timestamp_pb2 import Timestamp as PBTimestamp
 
@@ -151,6 +152,13 @@ def __init__(self, server_url: str, key: str | None = None) -> None:
 
         self._metadata = (("key", key),) if key else ()
 
+    @property
+    def stub(self) -> ReportingStub:
+        """The gRPC stub for the API."""
+        if self.channel is None or self._stub is None:
+            raise ClientNotConnected(server_url=self.server_url, operation="stub")
+        return self._stub
+
     # pylint: disable=too-many-arguments
     async def list_single_component_data(
         self,