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from time import sleep
from redis.exceptions import ConnectionError, TimeoutError
class Retry:
"""Retry a specific number of times after a failure"""
def __init__(
self, backoff, retries, supported_errors=(ConnectionError, TimeoutError)
):
"""
Initialize a `Retry` object with a `Backoff` object
that retries a maximum of `retries` times.
You can specify the types of supported errors which trigger
a retry with the `supported_errors` parameter.
"""
self._backoff = backoff
self._retries = retries
self._supported_errors = supported_errors
def call_with_retry(self, do, fail):
"""
Execute an operation that might fail and returns its result, or
raise the exception that was thrown depending on the `Backoff` object.
`do`: the operation to call. Expects no argument.
`fail`: the failure handler, expects the last error that was thrown
"""
self._backoff.reset()
failures = 0
while True:
try:
return do()
except self._supported_errors as error:
failures += 1
fail(error)
if failures > self._retries:
raise error
backoff = self._backoff.compute(failures)
if backoff > 0:
sleep(backoff)
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