72 lines
2.2 KiB
Python
72 lines
2.2 KiB
Python
# Copyright 2015 gRPC authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""A thread pool that logs exceptions raised by tasks executed within it."""
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from concurrent import futures
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import logging
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_LOGGER = logging.getLogger(__name__)
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def _wrap(behavior):
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"""Wraps an arbitrary callable behavior in exception-logging."""
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def _wrapping(*args, **kwargs):
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try:
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return behavior(*args, **kwargs)
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except Exception:
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_LOGGER.exception(
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'Unexpected exception from %s executed in logging pool!',
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behavior)
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raise
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return _wrapping
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class _LoggingPool(object):
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"""An exception-logging futures.ThreadPoolExecutor-compatible thread pool."""
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def __init__(self, backing_pool):
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self._backing_pool = backing_pool
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self._backing_pool.shutdown(wait=True)
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def submit(self, fn, *args, **kwargs):
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return self._backing_pool.submit(_wrap(fn), *args, **kwargs)
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def map(self, func, *iterables, **kwargs):
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return self._backing_pool.map(_wrap(func),
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*iterables,
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timeout=kwargs.get('timeout', None))
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def shutdown(self, wait=True):
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self._backing_pool.shutdown(wait=wait)
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def pool(max_workers):
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"""Creates a thread pool that logs exceptions raised by the tasks within it.
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Args:
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max_workers: The maximum number of worker threads to allow the pool.
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Returns:
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A futures.ThreadPoolExecutor-compatible thread pool that logs exceptions
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raised by the tasks executed within it.
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"""
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return _LoggingPool(futures.ThreadPoolExecutor(max_workers))
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