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# Copyright 2016–2021 Julien Danjou
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# Copyright 2016 Joshua Harlow
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# Copyright 2013-2014 Ray Holder
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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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import abc
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import typing
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if typing.TYPE_CHECKING:
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import threading
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from pip._vendor.tenacity import RetryCallState
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class stop_base(abc.ABC):
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"""Abstract base class for stop strategies."""
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@abc.abstractmethod
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def __call__(self, retry_state: "RetryCallState") -> bool:
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pass
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def __and__(self, other: "stop_base") -> "stop_all":
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return stop_all(self, other)
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def __or__(self, other: "stop_base") -> "stop_any":
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return stop_any(self, other)
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class stop_any(stop_base):
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"""Stop if any of the stop condition is valid."""
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def __init__(self, *stops: stop_base) -> None:
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self.stops = stops
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def __call__(self, retry_state: "RetryCallState") -> bool:
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return any(x(retry_state) for x in self.stops)
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class stop_all(stop_base):
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"""Stop if all the stop conditions are valid."""
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def __init__(self, *stops: stop_base) -> None:
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self.stops = stops
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def __call__(self, retry_state: "RetryCallState") -> bool:
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return all(x(retry_state) for x in self.stops)
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class _stop_never(stop_base):
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"""Never stop."""
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def __call__(self, retry_state: "RetryCallState") -> bool:
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return False
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stop_never = _stop_never()
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class stop_when_event_set(stop_base):
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"""Stop when the given event is set."""
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def __init__(self, event: "threading.Event") -> None:
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self.event = event
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def __call__(self, retry_state: "RetryCallState") -> bool:
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return self.event.is_set()
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class stop_after_attempt(stop_base):
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"""Stop when the previous attempt >= max_attempt."""
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def __init__(self, max_attempt_number: int) -> None:
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self.max_attempt_number = max_attempt_number
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def __call__(self, retry_state: "RetryCallState") -> bool:
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return retry_state.attempt_number >= self.max_attempt_number
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class stop_after_delay(stop_base):
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"""Stop when the time from the first attempt >= limit."""
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def __init__(self, max_delay: float) -> None:
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self.max_delay = max_delay
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def __call__(self, retry_state: "RetryCallState") -> bool:
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return retry_state.seconds_since_start >= self.max_delay
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