follow-up 713a20e309https://github.com/spesmilo/electrum/pull/9833
On Windows, above commit broke dns_hacks.py with dnspython==2.0.0 and 2.1.0.
Newer dnspython works.
Root cause not immediately obvious. Probably not worth debugging, I will just bump the required version instead.
With dnspython==2.0.0, the log gets spammed and dns fails:
```
$ python3 -m pip install --user "dnspython==2.0.0"
10.59 | E | asyncio | Exception in callback _ProactorBasePipeTransport._call_connection_lost(None)
handle: <Handle _ProactorBasePipeTransport._call_connection_lost(None)>
Traceback (most recent call last):
File "...\Python310\lib\asyncio\events.py", line 80, in _run
self._context.run(self._callback, *self._args)
File "...\Python310\lib\asyncio\proactor_events.py", line 158, in _call_connection_lost
self._protocol.connection_lost(exc)
File "...\Python310\site-packages\dns\_asyncio_backend.py", line 38, in connection_lost
self.recvfrom.set_exception(exc)
asyncio.exceptions.InvalidStateError: invalid state
```
With dnspython==2.1.0, no more log spam but all dns resolutions time out:
```
$ python3 -m pip install --user "dnspython==2.1.0"
33.29 | I | dns_hacks | dnspython failed to resolve dns (AAAA) for 'testnet.qtornado.com' with error: Timeout('The DNS operation timed out after 31.591506242752075 seconds')
33.29 | I | dns_hacks | dnspython failed to resolve dns (AAAA) for 'api.coingecko.com' with error: Timeout('The DNS operation timed out after 31.590490579605103 seconds')
33.29 | I | dns_hacks | dnspython failed to resolve dns (A) for 'testnet.qtornado.com' with error: Timeout('The DNS operation timed out after 31.591506242752075 seconds')
33.29 | I | dns_hacks | dnspython failed to resolve dns (A) for 'api.coingecko.com' with error: Timeout('The DNS operation timed out after 31.590490579605103 seconds')
33.35 | I | dns_hacks | dnspython failed to resolve dns (AAAA) for 'blockstream.info' with error: Timeout('The DNS operation timed out after 31.59534502029419 seconds')
33.35 | I | dns_hacks | dnspython failed to resolve dns (A) for 'blockstream.info' with error: Timeout('The DNS operation timed out after 31.594367265701294 seconds')
33.38 | I | dns_hacks | dnspython failed to resolve dns (AAAA) for 'electrum.blockstream.info' with error: Timeout('The DNS operation timed out after 31.602211713790894 seconds')
33.38 | I | dns_hacks | dnspython failed to resolve dns (A) for 'electrum.blockstream.info' with error: Timeout('The DNS operation timed out after 31.60122585296631 seconds')
```
dnspython changed the overall timeout for a request from 30 sec to 5 sec in version 2.0
(see 7ed1648b84 )
5 seconds is not enough in some network conditions...
We manually set the timeout back to 30 sec.
Note that in case these dns hacks are applied, and the timeout is reached,
we fallback to the system dns resolver, which hopefully can get a response.
-----
log was full of:
I | dns_hacks | dnspython failed to resolve dns (AAAA) for 'electrum.org' with error: Timeout('The DNS operation timed out after 5.000827789306641 seconds')
I | dns_hacks | dnspython failed to resolve dns (A) for 'electrum.org' with error: Timeout('The DNS operation timed out after 5.000998020172119 seconds')
I | dns_hacks | dnspython failed to resolve dns (AAAA) for 'electrum.hsmiths.com' with error: Timeout('The DNS operation timed out after 5.000227451324463 seconds')
I | dns_hacks | dnspython failed to resolve dns (A) for 'electrum.hsmiths.com' with error: Timeout('The DNS operation timed out after 5.000523328781128 seconds')
...
