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# 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 as t
import tenacity
from tenacity import AttemptManager
from tenacity import BaseRetrying
from tenacity import DoAttempt
from tenacity import DoSleep
from tenacity import RetryCallState
from tenacity import RetryError
from tenacity import after_nothing
from tenacity import before_nothing
from tenacity import _utils
# Import all built-in retry strategies for easier usage.
from .retry import RetryBaseT
from .retry import retry_all # noqa
from .retry import retry_any # noqa
from .retry import retry_if_exception # noqa
from .retry import retry_if_result # noqa
from ..retry import RetryBaseT as SyncRetryBaseT
if t.TYPE_CHECKING:
from tenacity.stop import StopBaseT
from tenacity.wait import WaitBaseT
WrappedFnReturnT = t.TypeVar("WrappedFnReturnT")
WrappedFn = t.TypeVar("WrappedFn", bound=t.Callable[..., t.Awaitable[t.Any]])
def _portable_async_sleep(seconds: float) -> t.Awaitable[None]:
# If trio is already imported, then importing it is cheap.
# If trio isn't already imported, then it's definitely not running, so we
# can skip further checks.
if "trio" in sys.modules:
# If trio is available, then sniffio is too
import trio
import sniffio
if sniffio.current_async_library() == "trio":
return trio.sleep(seconds)
# Otherwise, assume asyncio
# Lazy import asyncio as it's expensive (responsible for 25-50% of total import overhead).
import asyncio
return asyncio.sleep(seconds)
class AsyncRetrying(BaseRetrying):
def __init__(
self,
sleep: t.Callable[
[t.Union[int, float]], t.Union[None, t.Awaitable[None]]
] = _portable_async_sleep,
stop: "StopBaseT" = tenacity.stop.stop_never,
wait: "WaitBaseT" = tenacity.wait.wait_none(),
retry: "t.Union[SyncRetryBaseT, RetryBaseT]" = tenacity.retry_if_exception_type(),
before: t.Callable[
["RetryCallState"], t.Union[None, t.Awaitable[None]]
] = before_nothing,
after: t.Callable[
["RetryCallState"], t.Union[None, t.Awaitable[None]]
] = after_nothing,
before_sleep: t.Optional[
t.Callable[["RetryCallState"], t.Union[None, t.Awaitable[None]]]
] = None,
reraise: bool = False,
retry_error_cls: t.Type["RetryError"] = RetryError,
retry_error_callback: t.Optional[
t.Callable[["RetryCallState"], t.Union[t.Any, t.Awaitable[t.Any]]]
] = None,
) -> None:
super().__init__(
sleep=sleep, # type: ignore[arg-type]
stop=stop,
wait=wait,
retry=retry, # type: ignore[arg-type]
before=before, # type: ignore[arg-type]
after=after, # type: ignore[arg-type]
before_sleep=before_sleep, # type: ignore[arg-type]
reraise=reraise,
retry_error_cls=retry_error_cls,
retry_error_callback=retry_error_callback,
)
async def __call__( # type: ignore[override]
self, fn: WrappedFn, *args: t.Any, **kwargs: t.Any
) -> WrappedFnReturnT:
self.begin()
retry_state = RetryCallState(retry_object=self, fn=fn, args=args, kwargs=kwargs)
while True:
do = await 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()) # type: ignore[arg-type]
else:
retry_state.set_result(result)
elif isinstance(do, DoSleep):
retry_state.prepare_for_next_attempt()
await self.sleep(do) # type: ignore[misc]
else:
return do # type: ignore[no-any-return]
def _add_action_func(self, fn: t.Callable[..., t.Any]) -> None:
self.iter_state.actions.append(_utils.wrap_to_async_func(fn))
async def _run_retry(self, retry_state: "RetryCallState") -> None: # type: ignore[override]
self.iter_state.retry_run_result = await _utils.wrap_to_async_func(self.retry)(
retry_state
)
async def _run_wait(self, retry_state: "RetryCallState") -> None: # type: ignore[override]
if self.wait:
sleep = await _utils.wrap_to_async_func(self.wait)(retry_state)
else:
sleep = 0.0
retry_state.upcoming_sleep = sleep
async def _run_stop(self, retry_state: "RetryCallState") -> None: # type: ignore[override]
self.statistics["delay_since_first_attempt"] = retry_state.seconds_since_start
self.iter_state.stop_run_result = await _utils.wrap_to_async_func(self.stop)(
retry_state
)
async def iter(
self, retry_state: "RetryCallState"
) -> t.Union[DoAttempt, DoSleep, t.Any]: # noqa: A003
self._begin_iter(retry_state)
result = None
for action in self.iter_state.actions:
result = await action(retry_state)
return result
def __iter__(self) -> t.Generator[AttemptManager, None, None]:
raise TypeError("AsyncRetrying object is not iterable")
def __aiter__(self) -> "AsyncRetrying":
self.begin()
self._retry_state = RetryCallState(self, fn=None, args=(), kwargs={})
return self
async def __anext__(self) -> AttemptManager:
while True:
do = await 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) # type: ignore[misc]
else:
raise StopAsyncIteration
def wraps(self, fn: WrappedFn) -> WrappedFn:
wrapped = super().wraps(fn)
# Ensure wrapper is recognized as a coroutine function.
@functools.wraps(
fn, functools.WRAPPER_ASSIGNMENTS + ("__defaults__", "__kwdefaults__")
)
async def async_wrapped(*args: t.Any, **kwargs: t.Any) -> t.Any:
# Always create a copy to prevent overwriting the local contexts when
# calling the same wrapped functions multiple times in the same stack
copy = self.copy()
async_wrapped.statistics = copy.statistics # type: ignore[attr-defined]
return await copy(fn, *args, **kwargs)
# Preserve attributes
async_wrapped.retry = self # type: ignore[attr-defined]
async_wrapped.retry_with = wrapped.retry_with # type: ignore[attr-defined]
async_wrapped.statistics = {} # type: ignore[attr-defined]
return async_wrapped # type: ignore[return-value]
__all__ = [
"retry_all",
"retry_any",
"retry_if_exception",
"retry_if_result",
"WrappedFn",
"AsyncRetrying",
]
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