How to use the vine.ensure_promise function in vine
To help you get started, we’ve selected a few vine examples, based on popular ways it is used in public projects.
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celery / kombu / kombu / transport / SQS.py View on Github 
def _get_bulk_async(self, queue,
max_if_unlimited=SQS_MAX_MESSAGES, callback=None):
maxcount = self._get_message_estimate()
if maxcount:
return self._get_async(queue, maxcount, callback=callback)
# Not allowed to consume, make sure to notify callback..
callback = ensure_promise(callback)
callback([])
return callback
