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