m1racoli commented on code in PR #36849:
URL: https://github.com/apache/airflow/pull/36849#discussion_r1458541688
##########
airflow/providers/google/common/hooks/base_google.py:
##########
@@ -623,6 +628,51 @@ def test_connection(self):
return status, message
+class CredentialsToken(Token):
+ """A token implementation which makes Google credentials objects
accessible to [gcloud-aio](https://talkiq.github.io/gcloud-aio/) clients.
+
+ This class allows us to create token instances from credentials objects
and thus supports a variety of use cases for Google
+ credentials in Airflow (i.e. impersonation chain). By relying on a
existing credentials object we leverage functionality provided by the
GoogleBaseHook
+ for generating credentials objects.
+ """
+
+ def __init__(
+ self,
+ credentials: Credentials,
+ *,
+ project: str | None = None,
+ session: ClientSession | None = None,
+ ) -> None:
+ super().__init__(session=cast(Session, session))
+ self.credentials = credentials
+ self.project = project
+
+ @classmethod
+ async def from_hook(
+ cls,
+ hook: GoogleBaseHook,
+ *,
+ session: ClientSession | None = None,
+ ) -> CredentialsToken:
+ credentials, project = hook.get_credentials_and_project_id()
+ return cls(
+ credentials=credentials,
+ project=project,
+ session=session,
+ )
+
+ async def get_project(self) -> str | None:
+ return self.project
Review Comment:
We are subclassing `cloud.aio.auth.token.Token` which is used in the
corresponding `gcloud-aio` clients. It mostly provides two asynchronous methods
`get` and `get_project`, which are used in the clients to perform certain
actions. Without it the implementation of `CredentialsToken` would be
incomplete and could cause problems.
Even though we currently pass the `project` argument in all client
instances, not re-implementing this method could cause side effects in those
clients in the future. All clients rely on the [token's
get_project](https://github.com/talkiq/gcloud-aio/blob/f1132b005ba35d8059229a9ca88b90f31f77456d/bigquery/gcloud/aio/bigquery/bigquery.py#L93)
method, if no project has been specified.
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