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https://github.com/blockchain-etl/ethereum-etl.git
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49 lines
1.9 KiB
Python
49 lines
1.9 KiB
Python
# MIT License
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#
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# Copyright (c) 2018 Evgeny Medvedev, evge.medvedev@gmail.com
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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class FailSafeExecutor:
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def __init__(self, delegate):
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self._delegate = delegate
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self._futures = []
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def submit(self, fn, *args, **kwargs):
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self._check_completed_futures()
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future = self._delegate.submit(fn, *args, **kwargs)
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self._futures.append(future)
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return future
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def shutdown(self):
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self._delegate.shutdown(wait=True)
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self._check_completed_futures()
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assert len(self._futures) == 0
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def _check_completed_futures(self):
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"""Fail safe in this case means fail fast. TODO: Add retry logic"""
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for future in self._futures.copy():
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if future.done():
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# Will throw an exception here if the future failed
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future.result()
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self._futures.remove(future)
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