224 lines
7.8 KiB
Python
224 lines
7.8 KiB
Python
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# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license
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import asyncio
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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 dns.asyncbackend
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import dns.exception
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import dns.inet
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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 AsyncioQuicStream(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 = asyncio.Condition()
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async def _wait_for_wake_up(self):
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async with self._wake_up:
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await self._wake_up.wait()
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async def wait_for(self, amount, expiration):
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while True:
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timeout = self._timeout_from_expiration(expiration)
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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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try:
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await asyncio.wait_for(self._wait_for_wake_up(), timeout)
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except TimeoutError:
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raise dns.exception.Timeout
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self._expecting = 0
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async def receive(self, timeout=None):
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expiration = self._expiration_from_timeout(timeout)
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await self.wait_for(2, expiration)
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(size,) = struct.unpack("!H", self._buffer.get(2))
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await self.wait_for(size, expiration)
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return self._buffer.get(size)
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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 AsyncioQuicConnection(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 = None
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self._handshake_complete = asyncio.Event()
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self._socket_created = asyncio.Event()
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self._wake_timer = asyncio.Condition()
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self._receiver_task = None
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self._sender_task = None
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async def _receiver(self):
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try:
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af = dns.inet.af_for_address(self._address)
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backend = dns.asyncbackend.get_backend("asyncio")
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# Note that peer is a low-level address tuple, but make_socket() wants
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# a high-level address tuple, so we convert.
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self._socket = await backend.make_socket(
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af, socket.SOCK_DGRAM, 0, self._source, (self._peer[0], self._peer[1])
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)
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self._socket_created.set()
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async with self._socket:
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while not self._done:
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(datagram, address) = await self._socket.recvfrom(
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QUIC_MAX_DATAGRAM, None
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)
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if address[0] != self._peer[0] or address[1] != self._peer[1]:
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continue
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self._connection.receive_datagram(
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datagram, self._peer[0], time.time()
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)
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# Wake up the timer in case the sender is sleeping, as there may be
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# stuff to send now.
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async with self._wake_timer:
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self._wake_timer.notify_all()
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except Exception:
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pass
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finally:
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self._done = True
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async with self._wake_timer:
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self._wake_timer.notify_all()
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self._handshake_complete.set()
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async def _wait_for_wake_timer(self):
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async with self._wake_timer:
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await self._wake_timer.wait()
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async def _sender(self):
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await self._socket_created.wait()
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while not self._done:
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datagrams = self._connection.datagrams_to_send(time.time())
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for datagram, address in datagrams:
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assert address == self._peer[0]
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await self._socket.sendto(datagram, self._peer, None)
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(expiration, interval) = self._get_timer_values()
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try:
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await asyncio.wait_for(self._wait_for_wake_timer(), interval)
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except Exception:
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pass
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self._handle_timer(expiration)
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await self._handle_events()
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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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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(
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event, aioquic.quic.events.ConnectionTerminated
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) or isinstance(event, aioquic.quic.events.StreamReset):
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self._done = True
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self._receiver_task.cancel()
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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 asyncio.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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async with self._wake_timer:
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self._wake_timer.notify_all()
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def run(self):
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if self._closed:
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return
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self._receiver_task = asyncio.Task(self._receiver())
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self._sender_task = asyncio.Task(self._sender())
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async def make_stream(self, timeout=None):
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try:
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await asyncio.wait_for(self._handshake_complete.wait(), timeout)
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except TimeoutError:
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raise dns.exception.Timeout
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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 = AsyncioQuicStream(self, stream_id)
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self._streams[stream_id] = stream
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return stream
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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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# sender might be blocked on this, so set it
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self._socket_created.set()
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await self._socket.close()
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async with self._wake_timer:
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self._wake_timer.notify_all()
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try:
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await self._receiver_task
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except asyncio.CancelledError:
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pass
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try:
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await self._sender_task
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except asyncio.CancelledError:
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pass
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class AsyncioQuicManager(AsyncQuicManager):
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def __init__(self, conf=None, verify_mode=ssl.CERT_REQUIRED, server_name=None):
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super().__init__(conf, verify_mode, AsyncioQuicConnection, server_name)
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def connect(self, address, port=853, source=None, source_port=0):
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(connection, start) = self._connect(address, port, source, source_port)
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if start:
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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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