OpenHome/venv/Lib/site-packages/pip/_vendor/tenacity/retry.py
2021-07-21 21:33:05 +02:00

193 lines
5.3 KiB
Python
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

# -*- encoding: utf-8 -*-
#
# Copyright 20162021 Julien Danjou
# Copyright 2016 Joshua Harlow
# Copyright 2013-2014 Ray Holder
#
# 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.
import abc
import re
from pip._vendor import six
@six.add_metaclass(abc.ABCMeta)
class retry_base(object):
"""Abstract base class for retry strategies."""
@abc.abstractmethod
def __call__(self, retry_state):
pass
def __and__(self, other):
return retry_all(self, other)
def __or__(self, other):
return retry_any(self, other)
class _retry_never(retry_base):
"""Retry strategy that never rejects any result."""
def __call__(self, retry_state):
return False
retry_never = _retry_never()
class _retry_always(retry_base):
"""Retry strategy that always rejects any result."""
def __call__(self, retry_state):
return True
retry_always = _retry_always()
class retry_if_exception(retry_base):
"""Retry strategy that retries if an exception verifies a predicate."""
def __init__(self, predicate):
self.predicate = predicate
def __call__(self, retry_state):
if retry_state.outcome.failed:
return self.predicate(retry_state.outcome.exception())
else:
return False
class retry_if_exception_type(retry_if_exception):
"""Retries if an exception has been raised of one or more types."""
def __init__(self, exception_types=Exception):
self.exception_types = exception_types
super(retry_if_exception_type, self).__init__(
lambda e: isinstance(e, exception_types)
)
class retry_unless_exception_type(retry_if_exception):
"""Retries until an exception is raised of one or more types."""
def __init__(self, exception_types=Exception):
self.exception_types = exception_types
super(retry_unless_exception_type, self).__init__(
lambda e: not isinstance(e, exception_types)
)
def __call__(self, retry_state):
# always retry if no exception was raised
if not retry_state.outcome.failed:
return True
return self.predicate(retry_state.outcome.exception())
class retry_if_result(retry_base):
"""Retries if the result verifies a predicate."""
def __init__(self, predicate):
self.predicate = predicate
def __call__(self, retry_state):
if not retry_state.outcome.failed:
return self.predicate(retry_state.outcome.result())
else:
return False
class retry_if_not_result(retry_base):
"""Retries if the result refutes a predicate."""
def __init__(self, predicate):
self.predicate = predicate
def __call__(self, retry_state):
if not retry_state.outcome.failed:
return not self.predicate(retry_state.outcome.result())
else:
return False
class retry_if_exception_message(retry_if_exception):
"""Retries if an exception message equals or matches."""
def __init__(self, message=None, match=None):
if message and match:
raise TypeError(
"{}() takes either 'message' or 'match', not both".format(
self.__class__.__name__
)
)
# set predicate
if message:
def message_fnc(exception):
return message == str(exception)
predicate = message_fnc
elif match:
prog = re.compile(match)
def match_fnc(exception):
return prog.match(str(exception))
predicate = match_fnc
else:
raise TypeError(
"{}() missing 1 required argument 'message' or 'match'".format(
self.__class__.__name__
)
)
super(retry_if_exception_message, self).__init__(predicate)
class retry_if_not_exception_message(retry_if_exception_message):
"""Retries until an exception message equals or matches."""
def __init__(self, *args, **kwargs):
super(retry_if_not_exception_message, self).__init__(*args, **kwargs)
# invert predicate
if_predicate = self.predicate
self.predicate = lambda *args_, **kwargs_: not if_predicate(*args_, **kwargs_)
def __call__(self, retry_state):
if not retry_state.outcome.failed:
return True
return self.predicate(retry_state.outcome.exception())
class retry_any(retry_base):
"""Retries if any of the retries condition is valid."""
def __init__(self, *retries):
self.retries = retries
def __call__(self, retry_state):
return any(r(retry_state) for r in self.retries)
class retry_all(retry_base):
"""Retries if all the retries condition are valid."""
def __init__(self, *retries):
self.retries = retries
def __call__(self, retry_state):
return all(r(retry_state) for r in self.retries)