Added support for Custom DNS resolver when using proxy (Asyncio).

[MKiwi]

import socket
import asyncio
import aiohttp

from aiohttp_socks import ProxyType, ProxyConnector
from python_socks.async_.asyncio._resolver import Resolver
from aiohttp import AsyncResolver


class CustomResolver(Resolver):

    def __init__(self, loop: asyncio.AbstractEventLoop):
        super().__init__(loop)
        self.resolver = AsyncResolver(loop, nameservers=['208.67.222.123'], udp_port=5353)

    async def resolve(self, host, port=0, family=socket.AF_UNSPEC):
        hosts = await self.resolver.resolve(host, port, family)
        return '', hosts[0]['host']


async def main():
    loop = asyncio.get_event_loop()
    resolver = CustomResolver(loop)
    proxy_host = '199.102.104.70'
    proxy_port = 4145

    connector = ProxyConnector(proxy_type=ProxyType.SOCKS5,
                               host=proxy_host,
                               port=proxy_port,
                               rdns=False,
                               proxy_resolver=resolver,
                               ssl=False
                               )
    async with aiohttp.ClientSession(connector=connector) as session:
        async with session.get("http://ipapi.co/json") as resp:
            print(await resp.json())


if __name__ == '__main__':
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
    asyncio.run(main())

[gaby]

@romis2012 Any chance of getting this merged?

[romis2012]

What host do you want to resolve with a custom resolver? If it's a proxy host, this PR doesn't solve that problem.

[romis2012]

In addition, adding a custom resolver involves exposing its public API, which I really don't want to do for a number of reasons.

[MKiwi]

The purpose of this is to have option to specify different nameservers when making resolutions and connections through proxy.

[romis2012]

The purpose of this is to have option to specify different nameservers when making resolutions and connections through proxy.

This (and this) PR does nothing for that. I suspect you want to use aiodns, if so, then open an issue