247 lines
9.0 KiB
Python
247 lines
9.0 KiB
Python
# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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import socket
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import ssl
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import struct
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import time
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import aioquic.quic.configuration # type: ignore
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import aioquic.quic.connection # type: ignore
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import aioquic.quic.events # type: ignore
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import trio
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import dns.exception
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import dns.inet
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from dns._asyncbackend import NullContext
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from dns.quic._common import (
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QUIC_MAX_DATAGRAM,
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AsyncQuicConnection,
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AsyncQuicManager,
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BaseQuicStream,
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UnexpectedEOF,
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)
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class TrioQuicStream(BaseQuicStream):
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def __init__(self, connection, stream_id):
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super().__init__(connection, stream_id)
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self._wake_up = trio.Condition()
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async def wait_for(self, amount):
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while True:
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if self._buffer.have(amount):
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return
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self._expecting = amount
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async with self._wake_up:
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await self._wake_up.wait()
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self._expecting = 0
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async def wait_for_end(self):
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while True:
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if self._buffer.seen_end():
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return
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async with self._wake_up:
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await self._wake_up.wait()
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async def receive(self, timeout=None):
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if timeout is None:
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context = NullContext(None)
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else:
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context = trio.move_on_after(timeout)
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with context:
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if self._connection.is_h3():
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await self.wait_for_end()
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return self._buffer.get_all()
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else:
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await self.wait_for(2)
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(size,) = struct.unpack("!H", self._buffer.get(2))
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await self.wait_for(size)
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return self._buffer.get(size)
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raise dns.exception.Timeout
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async def send(self, datagram, is_end=False):
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data = self._encapsulate(datagram)
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await self._connection.write(self._stream_id, data, is_end)
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async def _add_input(self, data, is_end):
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if self._common_add_input(data, is_end):
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async with self._wake_up:
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self._wake_up.notify()
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async def close(self):
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self._close()
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# Streams are async context managers
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async def __aenter__(self):
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return self
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async def __aexit__(self, exc_type, exc_val, exc_tb):
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await self.close()
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async with self._wake_up:
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self._wake_up.notify()
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return False
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class TrioQuicConnection(AsyncQuicConnection):
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def __init__(self, connection, address, port, source, source_port, manager=None):
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super().__init__(connection, address, port, source, source_port, manager)
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self._socket = trio.socket.socket(self._af, socket.SOCK_DGRAM, 0)
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self._handshake_complete = trio.Event()
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self._run_done = trio.Event()
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self._worker_scope = None
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self._send_pending = False
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async def _worker(self):
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try:
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if self._source:
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await self._socket.bind(
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dns.inet.low_level_address_tuple(self._source, self._af)
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)
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await self._socket.connect(self._peer)
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while not self._done:
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(expiration, interval) = self._get_timer_values(False)
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if self._send_pending:
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# Do not block forever if sends are pending. Even though we
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# have a wake-up mechanism if we've already started the blocking
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# read, the possibility of context switching in send means that
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# more writes can happen while we have no wake up context, so
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# we need self._send_pending to avoid (effectively) a "lost wakeup"
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# race.
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interval = 0.0
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with trio.CancelScope(
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deadline=trio.current_time() + interval
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) as self._worker_scope:
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datagram = await self._socket.recv(QUIC_MAX_DATAGRAM)
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self._connection.receive_datagram(datagram, self._peer, time.time())
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self._worker_scope = None
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self._handle_timer(expiration)
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await self._handle_events()
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# We clear this now, before sending anything, as sending can cause
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# context switches that do more sends. We want to know if that
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# happens so we don't block a long time on the recv() above.
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self._send_pending = False
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datagrams = self._connection.datagrams_to_send(time.time())
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for datagram, _ in datagrams:
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await self._socket.send(datagram)
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finally:
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self._done = True
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self._socket.close()
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self._handshake_complete.set()
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async def _handle_events(self):
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count = 0
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while True:
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event = self._connection.next_event()
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if event is None:
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return
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if isinstance(event, aioquic.quic.events.StreamDataReceived):
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if self.is_h3():
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h3_events = self._h3_conn.handle_event(event)
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for h3_event in h3_events:
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if isinstance(h3_event, aioquic.h3.events.HeadersReceived):
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stream = self._streams.get(event.stream_id)
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if stream:
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if stream._headers is None:
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stream._headers = h3_event.headers
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elif stream._trailers is None:
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stream._trailers = h3_event.headers
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if h3_event.stream_ended:
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await stream._add_input(b"", True)
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elif isinstance(h3_event, aioquic.h3.events.DataReceived):
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stream = self._streams.get(event.stream_id)
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if stream:
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await stream._add_input(
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h3_event.data, h3_event.stream_ended
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)
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else:
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stream = self._streams.get(event.stream_id)
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if stream:
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await stream._add_input(event.data, event.end_stream)
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elif isinstance(event, aioquic.quic.events.HandshakeCompleted):
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self._handshake_complete.set()
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elif isinstance(event, aioquic.quic.events.ConnectionTerminated):
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self._done = True
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self._socket.close()
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elif isinstance(event, aioquic.quic.events.StreamReset):
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stream = self._streams.get(event.stream_id)
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if stream:
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await stream._add_input(b"", True)
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count += 1
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if count > 10:
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# yield
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count = 0
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await trio.sleep(0)
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async def write(self, stream, data, is_end=False):
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self._connection.send_stream_data(stream, data, is_end)
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self._send_pending = True
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if self._worker_scope is not None:
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self._worker_scope.cancel()
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async def run(self):
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if self._closed:
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return
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async with trio.open_nursery() as nursery:
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nursery.start_soon(self._worker)
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self._run_done.set()
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async def make_stream(self, timeout=None):
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if timeout is None:
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context = NullContext(None)
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else:
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context = trio.move_on_after(timeout)
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with context:
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await self._handshake_complete.wait()
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if self._done:
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raise UnexpectedEOF
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stream_id = self._connection.get_next_available_stream_id(False)
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stream = TrioQuicStream(self, stream_id)
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self._streams[stream_id] = stream
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return stream
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raise dns.exception.Timeout
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async def close(self):
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if not self._closed:
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self._manager.closed(self._peer[0], self._peer[1])
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self._closed = True
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self._connection.close()
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self._send_pending = True
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if self._worker_scope is not None:
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self._worker_scope.cancel()
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await self._run_done.wait()
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class TrioQuicManager(AsyncQuicManager):
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def __init__(
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self,
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nursery,
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conf=None,
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verify_mode=ssl.CERT_REQUIRED,
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server_name=None,
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h3=False,
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):
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super().__init__(conf, verify_mode, TrioQuicConnection, server_name, h3)
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self._nursery = nursery
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def connect(
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self, address, port=853, source=None, source_port=0, want_session_ticket=True
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):
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(connection, start) = self._connect(
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address, port, source, source_port, want_session_ticket
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)
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if start:
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self._nursery.start_soon(connection.run)
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return connection
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async def __aenter__(self):
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return self
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async def __aexit__(self, exc_type, exc_val, exc_tb):
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# Copy the iterator into a list as exiting things will mutate the connections
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# table.
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connections = list(self._connections.values())
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for connection in connections:
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await connection.close()
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return False
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