Connection aborted in google/oauth2 affecting firebase

google/oauth2/_client.py の _token_endpoint_request_no_throw と _perform_request から始め、traceback 内の firebase_admin/messaging.py の呼び出しパスを使って失敗の原因を理解します。トークン更新の失敗を再現し、再試行可能なエラーの処理を確認します。Connection aborted が再試行の動作でカバーされ、関連するテストが成功すれば完了です。

Connection aborted didn't included in retryable list and any firebase API calls fails frequently.

Traceback (most recent call last):
  File "/usr/src/app/notifications/services/notification_service/providers/mobile.py", line 94, in _send_notification
    firebase.send(fb_message, app=firebase_app)
  File "/usr/local/lib/python3.10/site-packages/firebase_admin/messaging.py", line 121, in send
    return _get_messaging_service(app).send(message, dry_run)
  File "/usr/local/lib/python3.10/site-packages/firebase_admin/messaging.py", line 411, in send
    resp = self._client.body(
  File "/usr/local/lib/python3.10/site-packages/firebase_admin/_http_client.py", line 131, in body
    resp = self.request(method, url, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/firebase_admin/_http_client.py", line 118, in request
    resp = self._session.request(method, self.base_url + url, **kwargs)
  File "/usr/local/lib/python3.10/site-packages/google/auth/transport/requests.py", line 577, in request
    self.credentials.refresh(auth_request)
  File "/usr/local/lib/python3.10/site-packages/google/oauth2/service_account.py", line 445, in refresh
    access_token, expiry, _ = _client.jwt_grant(
  File "/usr/local/lib/python3.10/site-packages/google/oauth2/_client.py", line 308, in jwt_grant
    response_data = _token_endpoint_request(
  File "/usr/local/lib/python3.10/site-packages/google/oauth2/_client.py", line 268, in _token_endpoint_request
    response_status_ok, response_data, retryable_error = _token_endpoint_request_no_throw(
  File "/usr/local/lib/python3.10/site-packages/google/oauth2/_client.py", line 215, in _token_endpoint_request_no_throw
    request_succeeded, response_data, retryable_error = _perform_request()
  File "/usr/local/lib/python3.10/site-packages/google/oauth2/_client.py", line 191, in _perform_request
    response = request(
  File "/usr/local/lib/python3.10/site-packages/google/auth/transport/requests.py", line 192, in __call__
    raise new_exc from caught_exc
google.auth.exceptions.TransportError: ('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))