Mini Shell

# Copyright 2016 Étienne Bersac
# Copyright 2016 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 functools
import sys
import typing
from asyncio import sleep

from pip._vendor.tenacity import AttemptManager
from pip._vendor.tenacity import BaseRetrying
from pip._vendor.tenacity import DoAttempt
from pip._vendor.tenacity import DoSleep
from pip._vendor.tenacity import RetryCallState

WrappedFn = typing.TypeVar("WrappedFn", bound=typing.Callable)
_RetValT = typing.TypeVar("_RetValT")


class AsyncRetrying(BaseRetrying):
    def __init__(self, sleep: typing.Callable[[float], typing.Awaitable] = sleep, **kwargs: typing.Any) -> None:
        super().__init__(**kwargs)
        self.sleep = sleep

    async def __call__(  # type: ignore  # Change signature from supertype
        self,
        fn: typing.Callable[..., typing.Awaitable[_RetValT]],
        *args: typing.Any,
        **kwargs: typing.Any,
    ) -> _RetValT:
        self.begin()

        retry_state = RetryCallState(retry_object=self, fn=fn, args=args, kwargs=kwargs)
        while True:
            do = self.iter(retry_state=retry_state)
            if isinstance(do, DoAttempt):
                try:
                    result = await fn(*args, **kwargs)
                except BaseException:  # noqa: B902
                    retry_state.set_exception(sys.exc_info())
                else:
                    retry_state.set_result(result)
            elif isinstance(do, DoSleep):
                retry_state.prepare_for_next_attempt()
                await self.sleep(do)
            else:
                return do

    def __aiter__(self) -> "AsyncRetrying":
        self.begin()
        self._retry_state = RetryCallState(self, fn=None, args=(), kwargs={})
        return self

    async def __anext__(self) -> typing.Union[AttemptManager, typing.Any]:
        while True:
            do = self.iter(retry_state=self._retry_state)
            if do is None:
                raise StopAsyncIteration
            elif isinstance(do, DoAttempt):
                return AttemptManager(retry_state=self._retry_state)
            elif isinstance(do, DoSleep):
                self._retry_state.prepare_for_next_attempt()
                await self.sleep(do)
            else:
                return do

    def wraps(self, fn: WrappedFn) -> WrappedFn:
        fn = super().wraps(fn)
        # Ensure wrapper is recognized as a coroutine function.

        @functools.wraps(fn)
        async def async_wrapped(*args: typing.Any, **kwargs: typing.Any) -> typing.Any:
            return await fn(*args, **kwargs)

        # Preserve attributes
        async_wrapped.retry = fn.retry
        async_wrapped.retry_with = fn.retry_with

        return async_wrapped