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by Felipe Reyes
sync charm-helpers |
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# Copyright 2014-2015 Canonical Limited.
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#
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# This file is part of charm-helpers.
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#
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# charm-helpers is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3 as
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# published by the Free Software Foundation.
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#
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# charm-helpers is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with charm-helpers. If not, see <http://www.gnu.org/licenses/>.
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#
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# Copyright 2014 Canonical Ltd.
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#
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# Authors:
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# Edward Hope-Morley <opentastic@gmail.com>
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#
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import time |
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from charmhelpers.core.hookenv import ( |
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log, |
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INFO, |
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)
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def retry_on_exception(num_retries, base_delay=0, exc_type=Exception): |
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"""If the decorated function raises exception exc_type, allow num_retries
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retry attempts before raise the exception.
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"""
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def _retry_on_exception_inner_1(f): |
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def _retry_on_exception_inner_2(*args, **kwargs): |
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retries = num_retries |
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multiplier = 1 |
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while True: |
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try: |
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return f(*args, **kwargs) |
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except exc_type: |
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if not retries: |
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raise
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delay = base_delay * multiplier |
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multiplier += 1 |
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log("Retrying '%s' %d more times (delay=%s)" % |
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(f.__name__, retries, delay), level=INFO) |
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retries -= 1 |
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if delay: |
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time.sleep(delay) |
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return _retry_on_exception_inner_2 |
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return _retry_on_exception_inner_1 |