| # Copyright 2017, 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. |
| |
| """Private helpers for futures.""" |
| |
| import logging |
| import threading |
| |
| |
| _LOGGER = logging.getLogger(__name__) |
| |
| |
| def start_daemon_thread(*args, **kwargs): |
| """Starts a thread and marks it as a daemon thread.""" |
| thread = threading.Thread(*args, **kwargs) |
| thread.daemon = True |
| thread.start() |
| return thread |
| |
| |
| def safe_invoke_callback(callback, *args, **kwargs): |
| """Invoke a callback, swallowing and logging any exceptions.""" |
| # pylint: disable=bare-except |
| # We intentionally want to swallow all exceptions. |
| try: |
| return callback(*args, **kwargs) |
| except Exception: |
| _LOGGER.exception("Error while executing Future callback.") |