Connecting to IPv6-only hosts fails with a RuntimeError #6195
Description
Describe the bug
When aiohttp tries to connect to a host with only IPv6 address (with no IPv4 address), the exception RuntimeError: coroutine raised StopIteration is raised in TCPConnector._create_direct_connection caused by the StopIteration in _DNSCacheTable.next_addrs.
To Reproduce
- Create
aiohttp.ClientSession. - Try to request an URL with IPv6-only host, e.g.
ipv6.google.com.
E.g:await ClientSession().get('https://ipv6.google.com')
Expected behavior
await ClientSession().get('https://ipv6.google.com') does not fail and returns a response.
Logs/tracebacks
$ python -m asyncio
asyncio REPL 3.9.7 (default, Oct 10 2021, 15:13:22)
[GCC 11.1.0] on linux
>>> import asyncio
>>> from aiohttp import ClientSession
>>> await ClientSession().get('https://ipv6.google.com')
Traceback (most recent call last):
File "/home/***/.local/lib/python3.9/site-packages/aiohttp/connector.py", line 894, in _resolve_host
return self._cached_hosts.next_addrs(key)
File "/home/***/.local/lib/python3.9/site-packages/aiohttp/connector.py", line 716, in next_addrs
next(loop)
StopIteration
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/usr/lib/python3.9/concurrent/futures/_base.py", line 445, in result
return self.__get_result()
File "/usr/lib/python3.9/concurrent/futures/_base.py", line 390, in __get_result
raise self._exception
File "<console>", line 1, in <module>
File "/home/***/.local/lib/python3.9/site-packages/aiohttp/client.py", line 535, in _request
conn = await self._connector.connect(
File "/home/***/.local/lib/python3.9/site-packages/aiohttp/connector.py", line 543, in connect
proto = await self._create_connection(req, traces, timeout)
File "/home/***/.local/lib/python3.9/site-packages/aiohttp/connector.py", line 906, in _create_connection
_, proto = await self._create_direct_connection(req, traces, timeout)
File "/home/***/.local/lib/python3.9/site-packages/aiohttp/connector.py", line 1153, in _create_direct_connection
hosts = await asyncio.shield(host_resolved)
RuntimeError: coroutine raised StopIterationPython Version
$ python --version
Python 3.9.7aiohttp Version
$ python -m pip show aiohttp
Name: aiohttp
Version: 3.8.0
Summary: Async http client/server framework (asyncio)
Home-page: https://github.com/aio-libs/aiohttp
Author:
Author-email:
License: Apache 2
Location: /home/***/.local/lib/python3.9/site-packages
Requires: aiosignal, async-timeout, attrs, charset-normalizer, frozenlist, multidict, yarl
Required-by:multidict Version
$ python -m pip show multidict
Name: multidict
Version: 5.1.0
Summary: multidict implementation
Home-page: https://github.com/aio-libs/multidict
Author: Andrew Svetlov
Author-email: [email protected]
License: Apache 2
Location: /home/***/.local/lib/python3.9/site-packages
Requires:
Required-by: aiohttp, grpclib, yarlyarl Version
$ python -m pip show yarl
Name: yarl
Version: 1.6.3
Summary: Yet another URL library
Home-page: https://github.com/aio-libs/yarl/
Author: Andrew Svetlov
Author-email: [email protected]
License: Apache 2
Location: /home/***/.local/lib/python3.9/site-packages
Requires: idna, multidict
Required-by: aiohttpOS
Linux
Related component
Client
Additional context
No response
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