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# Copyright 2023 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import copy
import logging
import threading
import google.auth.exceptions as e
_LOGGER = logging.getLogger(__name__)
class RefreshThreadManager:
"""
Organizes exactly one background job that refresh a token.
"""
def __init__(self):
"""Initializes the manager."""
self._worker = None
self._lock = threading.Lock() # protects access to worker threads.
def start_refresh(self, cred, request):
"""Starts a refresh thread for the given credentials.
The credentials are refreshed using the request parameter.
request and cred MUST not be None
Returns True if a background refresh was kicked off. False otherwise.
Args:
cred: A credentials object.
request: A request object.
Returns:
bool
"""
if cred is None or request is None:
raise e.InvalidValue(
"Unable to start refresh. cred and request must be valid and instantiated objects."
)
with self._lock:
if self._worker is not None and self._worker._error_info is not None:
return False
if self._worker is None or not self._worker.is_alive(): # pragma: NO COVER
self._worker = RefreshThread(cred=cred, request=copy.deepcopy(request))
self._worker.start()
return True
def clear_error(self):
"""
Removes any errors that were stored from previous background refreshes.
"""
with self._lock:
if self._worker:
self._worker._error_info = None
def __getstate__(self):
"""Pickle helper that serializes the _lock attribute."""
state = self.__dict__.copy()
state["_lock"] = None
return state
def __setstate__(self, state):
"""Pickle helper that deserializes the _lock attribute."""
state["_lock"] = threading.Lock()
self.__dict__.update(state)
class RefreshThread(threading.Thread):
"""
Thread that refreshes credentials.
"""
def __init__(self, cred, request, **kwargs):
"""Initializes the thread.
Args:
cred: A Credential object to refresh.
request: A Request object used to perform a credential refresh.
**kwargs: Additional keyword arguments.
"""
super().__init__(**kwargs)
self._cred = cred
self._request = request
self._error_info = None
def run(self):
"""
Perform the credential refresh.
"""
try:
self._cred.refresh(self._request)
except Exception as err: # pragma: NO COVER
_LOGGER.error(f"Background refresh failed due to: {err}")
self._error_info = err