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name : stop.py
 # 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

from pip._vendor.tenacity import _utils

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)


StopBaseT = typing.Union[stop_base, typing.Callable[["RetryCallState"], bool]]


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: _utils.time_unit_type) -> None:
        self.max_delay = _utils.to_seconds(max_delay)

    def __call__(self, retry_state: "RetryCallState") -> bool:
        if retry_state.seconds_since_start is None:
            raise RuntimeError("__call__() called but seconds_since_start is not set")
        return retry_state.seconds_since_start >= self.max_delay
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