Sorry, I never got around writing a proper test for this so I am moving it to test needed if someone wants to volunteer for it.Import The better idea is serving on explicit AF_INET '127.0.0.1:' address when the connection is established to AF_INET6 ':'.
The main problem of mock-based tests in asyncio is that the tests become unreliably very easy after mocked asyncio internal changes. With (self.loop, 'sock_connect',Ĭoro = _connection(MyProto, host='localhost', port=8000, I guess that's the underlying idea of happy eyeballs but a test can be added for basic workflow since it lacks test_create_connection_happy_eyeballs_exception(self, sock_mock): Is there a way this can be tested? I tried simulating OSError for IPv4 address and returning socket for ipv6 one like it resolves correctly. Happy Eyeballs (also called Fast Fallback) is an algorithm published by the IETF that makes dual-stack applications (those that understand both IPv4 and IPv6) more responsive to users by attempting to connect using both IPv4 and IPv6 at the same time (preferring IPv6), thus minimizing common problems experienced by users with imperfect IPv6. Hmm, I thought that Happy Eyeballs is better tested. With contextlib.suppress(futures.TimeoutError):ĪttributeError: module 'asyncio.futures' has no attribute 'TimeoutError' Tom Sandoval and Rachel Leviss are still in touch - at least in one direction - cause one of them is wishing the other a happy birthday. Sock, _, _ = await staggered.staggered_race(įile "/Users/kasingar/stuff/python/cpython/Lib/ asyncio/staggered.py", line 144, in staggered_raceįile "/Users/kasingar/stuff/python/cpython/Lib/ asyncio/staggered.py", line 86, in run_one_coro This crate implements the Happy Eyeballs Connections setup described in RFC 8305. Transport, _ = await loop.create_connection(įile "/Users/kasingar/stuff/python/cpython/Lib/ asyncio/base_events.py", line 1041, in create_connection Happy Eyeballs is a technique used to provide a good user experience when connecting from dual-stack (IPv4 and IPv6) clients.
> conn = await asyncio.open_connection("localhost", port=8000, happy_eyeballs_delay=1)įile "/Users/kasingar/stuff/python/cpython/Lib/ concurrent/futures/_base.py", line 439, in resultįile "/Users/kasingar/stuff/python/cpython/Lib/ concurrent/futures/_base.py", line 388, in _get_resultįile "/Users/kasingar/stuff/python/cpython/Lib/ asyncio/streams.py", line 52, in open_connection prev in list next in list prev in thread next in thread List: openbsd-tech Subject: unwind(8) 'happy eyeballs' From: Florian ObserType "help", "copyright", "credits" or "license" for more information. citation needed openSUSE: 42. As of 6.6, OpenBSD still does not favor IPv6 connectivity if there is IPv4 connectivity. MeeGo: 1.2 No: Yes: No Yes: NetBSD: 7.0 Yes Yes Yes Yes OpenBSD: 6.6 Yes Yes Add-on: Yes RDNSS is only supported for rad(8) so far.
I guess the TimeoutError exception needs to be imported from asyncio.exceptions and not from asyncio.futures that causes AttributeError while instantiating a connection with happy eyeballs.Īsyncio REPL 3.9.0a2+ (heads/master:068768faf6, Dec 23 2019, 18:35:26) Versions 10.11 and up will prioritize IPv6 Traffic in spec with Happy Eyeballs.
Pull RequestsĪuthor: Karthikeyan Singaravelan (xtreak) * Incorrect import of TimeoutError while creating happy eyeballs connectionĬreated on 07:04 by xtreak, last changed 14:59 by admin.
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