Spaces:
Running
Running
| # Copyright 2015 gRPC authors. | |
| # | |
| # 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. | |
| """A thread pool that logs exceptions raised by tasks executed within it.""" | |
| from concurrent import futures | |
| import logging | |
| _LOGGER = logging.getLogger(__name__) | |
| def _wrap(behavior): | |
| """Wraps an arbitrary callable behavior in exception-logging.""" | |
| def _wrapping(*args, **kwargs): | |
| try: | |
| return behavior(*args, **kwargs) | |
| except Exception: | |
| _LOGGER.exception( | |
| "Unexpected exception from %s executed in logging pool!", | |
| behavior, | |
| ) | |
| raise | |
| return _wrapping | |
| class _LoggingPool(object): | |
| """An exception-logging futures.ThreadPoolExecutor-compatible thread pool.""" | |
| def __init__(self, backing_pool): | |
| self._backing_pool = backing_pool | |
| def __enter__(self): | |
| return self | |
| def __exit__(self, exc_type, exc_val, exc_tb): | |
| self._backing_pool.shutdown(wait=True) | |
| def submit(self, fn, *args, **kwargs): | |
| return self._backing_pool.submit(_wrap(fn), *args, **kwargs) | |
| def map(self, func, *iterables, **kwargs): | |
| return self._backing_pool.map( | |
| _wrap(func), *iterables, timeout=kwargs.get("timeout", None) | |
| ) | |
| def shutdown(self, wait=True): | |
| self._backing_pool.shutdown(wait=wait) | |
| def pool(max_workers): | |
| """Creates a thread pool that logs exceptions raised by the tasks within it. | |
| Args: | |
| max_workers: The maximum number of worker threads to allow the pool. | |
| Returns: | |
| A futures.ThreadPoolExecutor-compatible thread pool that logs exceptions | |
| raised by the tasks executed within it. | |
| """ | |
| return _LoggingPool(futures.ThreadPoolExecutor(max_workers)) | |