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Passing an async function to before/after handler? #412

@seidnerj

Description

@seidnerj

I have the following code:

@Retry(retry=retry_if_exception_type(SomeException),
stop=stop_after_attempt(5),
before_sleep=before_sleep_log(logging.getLogger(), logging.ERROR),
wait=wait_exponential(multiplier=1, min=1, max=10),
before=before_retry_handler)
async def async_wrapper(param):
....

async def before_retry_handler(retry_state):
....

Trouble is before_retry_handler has to be async because it calls async functions.

When I try to use the above, I get "RuntimeWarning: coroutine 'before_retry_handler' was never awaited self.before(retry_state)".

Am I missing something?

Thanks in advance

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