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111 lines
3.2 KiB
111 lines
3.2 KiB
import asyncio
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import socket
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from .abc import AbstractResolver
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__all__ = ('ThreadedResolver', 'AsyncResolver', 'DefaultResolver')
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try:
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import aiodns
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# aiodns_default = hasattr(aiodns.DNSResolver, 'gethostbyname')
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except ImportError: # pragma: no cover
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aiodns = None
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aiodns_default = False
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class ThreadedResolver(AbstractResolver):
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"""Use Executor for synchronous getaddrinfo() calls, which defaults to
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concurrent.futures.ThreadPoolExecutor.
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"""
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def __init__(self, loop=None):
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if loop is None:
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loop = asyncio.get_event_loop()
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self._loop = loop
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async def resolve(self, host, port=0, family=socket.AF_INET):
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infos = await self._loop.getaddrinfo(
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host, port, type=socket.SOCK_STREAM, family=family)
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hosts = []
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for family, _, proto, _, address in infos:
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hosts.append(
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{'hostname': host,
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'host': address[0], 'port': address[1],
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'family': family, 'proto': proto,
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'flags': socket.AI_NUMERICHOST})
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return hosts
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async def close(self):
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pass
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class AsyncResolver(AbstractResolver):
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"""Use the `aiodns` package to make asynchronous DNS lookups"""
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def __init__(self, loop=None, *args, **kwargs):
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if loop is None:
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loop = asyncio.get_event_loop()
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if aiodns is None:
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raise RuntimeError("Resolver requires aiodns library")
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self._loop = loop
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self._resolver = aiodns.DNSResolver(*args, loop=loop, **kwargs)
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if not hasattr(self._resolver, 'gethostbyname'):
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# aiodns 1.1 is not available, fallback to DNSResolver.query
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self.resolve = self._resolve_with_query
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async def resolve(self, host, port=0, family=socket.AF_INET):
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try:
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resp = await self._resolver.gethostbyname(host, family)
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except aiodns.error.DNSError as exc:
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msg = exc.args[1] if len(exc.args) >= 1 else "DNS lookup failed"
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raise OSError(msg) from exc
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hosts = []
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for address in resp.addresses:
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hosts.append(
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{'hostname': host,
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'host': address, 'port': port,
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'family': family, 'proto': 0,
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'flags': socket.AI_NUMERICHOST})
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if not hosts:
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raise OSError("DNS lookup failed")
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return hosts
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async def _resolve_with_query(self, host, port=0, family=socket.AF_INET):
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if family == socket.AF_INET6:
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qtype = 'AAAA'
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else:
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qtype = 'A'
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try:
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resp = await self._resolver.query(host, qtype)
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except aiodns.error.DNSError as exc:
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msg = exc.args[1] if len(exc.args) >= 1 else "DNS lookup failed"
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raise OSError(msg) from exc
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hosts = []
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for rr in resp:
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hosts.append(
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{'hostname': host,
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'host': rr.host, 'port': port,
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'family': family, 'proto': 0,
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'flags': socket.AI_NUMERICHOST})
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if not hosts:
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raise OSError("DNS lookup failed")
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return hosts
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async def close(self):
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return self._resolver.cancel()
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DefaultResolver = AsyncResolver if aiodns_default else ThreadedResolver
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