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from __future__ import annotations
import attrs
from attr.validators import instance_of
from tenacity import (
AsyncRetrying,
RetryCallState,
retry_if_exception_type,
stop_after_delay,
wait_exponential,
)
from tenacity.stop import stop_base
from tenacity.wait import wait_base
@attrs.define(kw_only=True, frozen=True)
class RetrySettings:
"""
Settings for retrying an operation with Tenacity.
:param stop: defines when to stop trying
:param wait: defines how long to wait between attempts
"""
stop: stop_base = attrs.field(
validator=instance_of(stop_base),
default=stop_after_delay(60),
)
wait: wait_base = attrs.field(
validator=instance_of(wait_base),
default=wait_exponential(min=0.5, max=20),
)
@attrs.define(kw_only=True, slots=False)
class RetryMixin:
"""
Mixin that provides support for retrying operations.
:param retry_settings: Tenacity settings for retrying operations in case of a
database connecitivty problem
"""
retry_settings: RetrySettings = attrs.field(default=RetrySettings())
@property
def _temporary_failure_exceptions(self) -> tuple[type[Exception], ...]:
"""
Tuple of exception classes which indicate that the operation should be retried.
"""
return ()
def _retry(self) -> AsyncRetrying:
def after_attempt(self, retry_state: RetryCallState) -> None:
self._logger.warning(
"Temporary data store error (attempt %d): %s",
retry_state.attempt_number,
retry_state.outcome.exception(),
)
return AsyncRetrying(
stop=self.retry_settings.stop,
wait=self.retry_settings.wait,
retry=retry_if_exception_type(self._temporary_failure_exceptions),
after=after_attempt,
reraise=True,
)
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