mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-25 16:38:36 +01:00
149 lines
4.5 KiB
Python
149 lines
4.5 KiB
Python
import asyncio
|
|
import socket
|
|
from typing import Any, Dict, List, Optional
|
|
|
|
from .abc import AbstractResolver
|
|
from .helpers import get_running_loop
|
|
|
|
__all__ = ("ThreadedResolver", "AsyncResolver", "DefaultResolver")
|
|
|
|
try:
|
|
import aiodns
|
|
|
|
# aiodns_default = hasattr(aiodns.DNSResolver, 'gethostbyname')
|
|
except ImportError: # pragma: no cover
|
|
aiodns = None
|
|
|
|
aiodns_default = False
|
|
|
|
|
|
class ThreadedResolver(AbstractResolver):
|
|
"""Use Executor for synchronous getaddrinfo() calls, which defaults to
|
|
concurrent.futures.ThreadPoolExecutor.
|
|
"""
|
|
|
|
def __init__(self, loop: Optional[asyncio.AbstractEventLoop] = None) -> None:
|
|
self._loop = get_running_loop(loop)
|
|
|
|
async def resolve(
|
|
self, hostname: str, port: int = 0, family: int = socket.AF_INET
|
|
) -> List[Dict[str, Any]]:
|
|
infos = await self._loop.getaddrinfo(
|
|
hostname,
|
|
port,
|
|
type=socket.SOCK_STREAM,
|
|
family=family,
|
|
flags=socket.AI_ADDRCONFIG,
|
|
)
|
|
|
|
hosts = []
|
|
for family, _, proto, _, address in infos:
|
|
if family == socket.AF_INET6 and address[3]: # type: ignore
|
|
# This is essential for link-local IPv6 addresses.
|
|
# LL IPv6 is a VERY rare case. Strictly speaking, we should use
|
|
# getnameinfo() unconditionally, but performance makes sense.
|
|
host, _port = socket.getnameinfo(
|
|
address, socket.NI_NUMERICHOST | socket.NI_NUMERICSERV
|
|
)
|
|
port = int(_port)
|
|
else:
|
|
host, port = address[:2]
|
|
hosts.append(
|
|
{
|
|
"hostname": hostname,
|
|
"host": host,
|
|
"port": port,
|
|
"family": family,
|
|
"proto": proto,
|
|
"flags": socket.AI_NUMERICHOST | socket.AI_NUMERICSERV,
|
|
}
|
|
)
|
|
|
|
return hosts
|
|
|
|
async def close(self) -> None:
|
|
pass
|
|
|
|
|
|
class AsyncResolver(AbstractResolver):
|
|
"""Use the `aiodns` package to make asynchronous DNS lookups"""
|
|
|
|
def __init__(
|
|
self,
|
|
loop: Optional[asyncio.AbstractEventLoop] = None,
|
|
*args: Any,
|
|
**kwargs: Any
|
|
) -> None:
|
|
if aiodns is None:
|
|
raise RuntimeError("Resolver requires aiodns library")
|
|
|
|
self._loop = get_running_loop(loop)
|
|
self._resolver = aiodns.DNSResolver(*args, loop=loop, **kwargs)
|
|
|
|
if not hasattr(self._resolver, "gethostbyname"):
|
|
# aiodns 1.1 is not available, fallback to DNSResolver.query
|
|
self.resolve = self._resolve_with_query # type: ignore
|
|
|
|
async def resolve(
|
|
self, host: str, port: int = 0, family: int = socket.AF_INET
|
|
) -> List[Dict[str, Any]]:
|
|
try:
|
|
resp = await self._resolver.gethostbyname(host, family)
|
|
except aiodns.error.DNSError as exc:
|
|
msg = exc.args[1] if len(exc.args) >= 1 else "DNS lookup failed"
|
|
raise OSError(msg) from exc
|
|
hosts = []
|
|
for address in resp.addresses:
|
|
hosts.append(
|
|
{
|
|
"hostname": host,
|
|
"host": address,
|
|
"port": port,
|
|
"family": family,
|
|
"proto": 0,
|
|
"flags": socket.AI_NUMERICHOST | socket.AI_NUMERICSERV,
|
|
}
|
|
)
|
|
|
|
if not hosts:
|
|
raise OSError("DNS lookup failed")
|
|
|
|
return hosts
|
|
|
|
async def _resolve_with_query(
|
|
self, host: str, port: int = 0, family: int = socket.AF_INET
|
|
) -> List[Dict[str, Any]]:
|
|
if family == socket.AF_INET6:
|
|
qtype = "AAAA"
|
|
else:
|
|
qtype = "A"
|
|
|
|
try:
|
|
resp = await self._resolver.query(host, qtype)
|
|
except aiodns.error.DNSError as exc:
|
|
msg = exc.args[1] if len(exc.args) >= 1 else "DNS lookup failed"
|
|
raise OSError(msg) from exc
|
|
|
|
hosts = []
|
|
for rr in resp:
|
|
hosts.append(
|
|
{
|
|
"hostname": host,
|
|
"host": rr.host,
|
|
"port": port,
|
|
"family": family,
|
|
"proto": 0,
|
|
"flags": socket.AI_NUMERICHOST,
|
|
}
|
|
)
|
|
|
|
if not hosts:
|
|
raise OSError("DNS lookup failed")
|
|
|
|
return hosts
|
|
|
|
async def close(self) -> None:
|
|
return self._resolver.cancel()
|
|
|
|
|
|
DefaultResolver = AsyncResolver if aiodns_default else ThreadedResolver
|