tree fd9f5a370116b72d942687484a99b70a30448373
parent 6d822cbc2a7a68e39583991b3f69ff76b032d585
author Zac Medico <zmedico@gentoo.org> 1521229074 -0700
committer Zac Medico <zmedico@gentoo.org> 1522688004 -0700
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Add retry decorator (API inspired by tenacity)

This decorator will be useful for retrying asynchronous
operations, such as gpg key refresh (bug 649276). The
API is inspired by tenacity, but is simpler. Only
asynchronous functions (like @asyncio.coroutine functions)
are supported. In order to retry a synchronous function,
first convert it to an asynchronous function as follows:

    asynchronous_func = functools.partial(
        loop.run_in_executor, None, synchronous_func)

Bug: https://bugs.gentoo.org/649276
See: https://github.com/jd/tenacity
Reviewed-by: Alec Warner <antarus@gentoo.org>