mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-10 01:17:42 +01:00
149 lines
4.5 KiB
Python
149 lines
4.5 KiB
Python
import asyncio
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import socket
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from typing import Any, Dict, List, Optional
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from .abc import AbstractResolver
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from .helpers import get_running_loop
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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: Optional[asyncio.AbstractEventLoop] = None) -> None:
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self._loop = get_running_loop(loop)
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async def resolve(
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self, hostname: str, port: int = 0, family: int = socket.AF_INET
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) -> List[Dict[str, Any]]:
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infos = await self._loop.getaddrinfo(
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hostname,
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port,
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type=socket.SOCK_STREAM,
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family=family,
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flags=socket.AI_ADDRCONFIG,
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)
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hosts = []
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for family, _, proto, _, address in infos:
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if family == socket.AF_INET6 and address[3]: # type: ignore
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# This is essential for link-local IPv6 addresses.
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# LL IPv6 is a VERY rare case. Strictly speaking, we should use
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# getnameinfo() unconditionally, but performance makes sense.
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host, _port = socket.getnameinfo(
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address, socket.NI_NUMERICHOST | socket.NI_NUMERICSERV
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)
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port = int(_port)
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else:
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host, port = address[:2]
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hosts.append(
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{
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"hostname": hostname,
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"host": host,
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"port": port,
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"family": family,
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"proto": proto,
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"flags": socket.AI_NUMERICHOST | socket.AI_NUMERICSERV,
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}
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)
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return hosts
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async def close(self) -> None:
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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__(
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self,
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loop: Optional[asyncio.AbstractEventLoop] = None,
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*args: Any,
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**kwargs: Any
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) -> None:
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if aiodns is None:
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raise RuntimeError("Resolver requires aiodns library")
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self._loop = get_running_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 # type: ignore
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async def resolve(
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self, host: str, port: int = 0, family: int = socket.AF_INET
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) -> List[Dict[str, Any]]:
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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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{
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"hostname": host,
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"host": address,
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"port": port,
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"family": family,
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"proto": 0,
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"flags": socket.AI_NUMERICHOST | socket.AI_NUMERICSERV,
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}
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)
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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(
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self, host: str, port: int = 0, family: int = socket.AF_INET
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) -> List[Dict[str, Any]]:
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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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{
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"hostname": host,
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"host": rr.host,
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"port": port,
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"family": family,
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"proto": 0,
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"flags": socket.AI_NUMERICHOST,
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}
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)
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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) -> None:
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return self._resolver.cancel()
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DefaultResolver = AsyncResolver if aiodns_default else ThreadedResolver
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