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Edit File: tornadoweb.py

# Copyright 2017 Elisey Zanko
#
# 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 sys
import typing

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

from tornado import gen

if typing.TYPE_CHECKING:
    from tornado.concurrent import Future

_RetValT = typing.TypeVar("_RetValT")

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

@gen.coroutine
    def __call__(  # type: ignore  # Change signature from supertype
        self,
        fn: "typing.Callable[..., typing.Union[typing.Generator[typing.Any, typing.Any, _RetValT], Future[_RetValT]]]",
        *args: typing.Any,
        **kwargs: typing.Any,
    ) -> "typing.Generator[typing.Any, 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 = yield 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()
                yield self.sleep(do)
            else:
                raise gen.Return(do)