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[connection] move asyncio code out of QuicConnection (see #4)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1 @@ | ||
| from .client import connect # noqa | ||
| from .connection import QuicConnection # noqa | ||
| from .server import serve # noqa |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| from .client import connect # noqa | ||
| from .server import serve # noqa |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,189 @@ | ||
| import asyncio | ||
| from typing import Any, Callable, Dict, Optional, Text, Tuple, Union, cast | ||
|
|
||
| from .. import events | ||
| from ..connection import NetworkAddress, QuicConnection | ||
|
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| QuicConnectionIdHandler = Callable[[bytes], None] | ||
| QuicStreamHandler = Callable[[asyncio.StreamReader, asyncio.StreamWriter], None] | ||
|
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|
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| class QuicConnectionProtocol(asyncio.DatagramProtocol): | ||
| def __init__( | ||
| self, | ||
| connection: QuicConnection, | ||
| stream_handler: Optional[QuicStreamHandler] = None, | ||
| ): | ||
| self._connection = connection | ||
| self._connection_id_issued_handler: QuicConnectionIdHandler = lambda c: None | ||
| self._connection_id_retired_handler: QuicConnectionIdHandler = lambda c: None | ||
|
|
||
| if stream_handler is not None: | ||
| self._stream_handler = stream_handler | ||
| else: | ||
| self._stream_handler = lambda r, w: None | ||
|
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||
| def close(self) -> None: | ||
| self._connection.close() | ||
| self._send_pending() | ||
|
|
||
| def connect(self, addr: NetworkAddress, protocol_version: int) -> None: | ||
| self._connection.connect( | ||
| addr, now=self._loop.time(), protocol_version=protocol_version | ||
| ) | ||
| self._send_pending() | ||
|
|
||
| def connection_made(self, transport: asyncio.BaseTransport) -> None: | ||
| loop = asyncio.get_event_loop() | ||
|
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||
| self._closed = asyncio.Event() | ||
| self._connected_waiter = loop.create_future() | ||
| self._loop = loop | ||
| self._ping_waiter: Optional[asyncio.Future[None]] = None | ||
| self._send_task: Optional[asyncio.Handle] = None | ||
| self._stream_readers: Dict[int, asyncio.StreamReader] = {} | ||
| self._timer: Optional[asyncio.TimerHandle] = None | ||
| self._timer_at: Optional[float] = None | ||
| self._transport = cast(asyncio.DatagramTransport, transport) | ||
|
|
||
| def datagram_received(self, data: Union[bytes, Text], addr: NetworkAddress) -> None: | ||
| self._connection.receive_datagram( | ||
| cast(bytes, data), addr, now=self._loop.time() | ||
| ) | ||
| self._send_pending() | ||
|
|
||
| async def create_stream( | ||
| self, is_unidirectional: bool = False | ||
| ) -> Tuple[asyncio.StreamReader, asyncio.StreamWriter]: | ||
| """ | ||
| Create a QUIC stream and return a pair of (reader, writer) objects. | ||
| The returned reader and writer objects are instances of :class:`asyncio.StreamReader` | ||
| and :class:`asyncio.StreamWriter` classes. | ||
| """ | ||
| stream = self._connection.create_stream(is_unidirectional=is_unidirectional) | ||
| return self._create_stream(stream.stream_id) | ||
|
|
||
| def request_key_update(self) -> None: | ||
| """ | ||
| Request an update of the encryption keys. | ||
| """ | ||
| self._connection.request_key_update() | ||
| self._send_pending() | ||
|
|
||
| async def ping(self) -> None: | ||
| """ | ||
| Pings the remote host and waits for the response. | ||
| """ | ||
| assert self._ping_waiter is None, "already await a ping" | ||
| self._ping_waiter = self._loop.create_future() | ||
| self._connection.send_ping(id(self._ping_waiter)) | ||
| self._send_soon() | ||
| await asyncio.shield(self._ping_waiter) | ||
|
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||
| async def wait_closed(self) -> None: | ||
| """ | ||
| Wait for the connection to be closed. | ||
| """ | ||
| await self._closed.wait() | ||
|
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||
| async def wait_connected(self) -> None: | ||
| """ | ||
| Wait for the TLS handshake to complete. | ||
| """ | ||
| await asyncio.shield(self._connected_waiter) | ||
|
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| def _create_stream( | ||
| self, stream_id: int | ||
| ) -> Tuple[asyncio.StreamReader, asyncio.StreamWriter]: | ||
| adapter = QuicStreamAdapter(self, stream_id) | ||
| reader = asyncio.StreamReader() | ||
| writer = asyncio.StreamWriter(adapter, None, reader, None) | ||
| self._stream_readers[stream_id] = reader | ||
| return reader, writer | ||
|
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| def _handle_timer(self) -> None: | ||
| now = max(self._timer_at, self._loop.time()) | ||
|
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| self._timer = None | ||
| self._timer_at = None | ||
|
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| self._connection.handle_timer(now=now) | ||
|
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| self._send_pending() | ||
|
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| def _send_pending(self) -> None: | ||
| self._send_task = None | ||
|
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| # process events | ||
| event = self._connection.next_event() | ||
| while event is not None: | ||
| if isinstance(event, events.ConnectionIdIssued): | ||
| self._connection_id_issued_handler(event.connection_id) | ||
| elif isinstance(event, events.ConnectionIdRetired): | ||
| self._connection_id_retired_handler(event.connection_id) | ||
| elif isinstance(event, events.ConnectionTerminated): | ||
| for reader in self._stream_readers.values(): | ||
| reader.feed_eof() | ||
| if not self._connected_waiter.done(): | ||
| self._connected_waiter.set_exception(ConnectionError) | ||
| self._closed.set() | ||
| elif isinstance(event, events.HandshakeCompleted): | ||
| self._connected_waiter.set_result(None) | ||
| elif isinstance(event, events.PongReceived): | ||
| waiter = self._ping_waiter | ||
| self._ping_waiter = None | ||
| waiter.set_result(None) | ||
| elif isinstance(event, events.StreamDataReceived): | ||
| reader = self._stream_readers.get(event.stream_id, None) | ||
| if reader is None: | ||
| reader, writer = self._create_stream(event.stream_id) | ||
| self._stream_handler(reader, writer) | ||
| reader.feed_data(event.data) | ||
| if event.end_stream: | ||
| reader.feed_eof() | ||
|
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| event = self._connection.next_event() | ||
|
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| # send datagrams | ||
| for data, addr in self._connection.datagrams_to_send(now=self._loop.time()): | ||
| self._transport.sendto(data, addr) | ||
|
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||
| # re-arm timer | ||
| timer_at = self._connection.get_timer() | ||
| if self._timer is not None and self._timer_at != timer_at: | ||
| self._timer.cancel() | ||
| self._timer = None | ||
| if self._timer is None and timer_at is not None: | ||
| self._timer = self._loop.call_at(timer_at, self._handle_timer) | ||
| self._timer_at = timer_at | ||
|
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| def _send_soon(self) -> None: | ||
| if self._send_task is None: | ||
| self._send_task = self._loop.call_soon(self._send_pending) | ||
|
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|
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| class QuicStreamAdapter(asyncio.Transport): | ||
| def __init__(self, protocol: QuicConnectionProtocol, stream_id: int): | ||
| self.protocol = protocol | ||
| self.stream_id = stream_id | ||
|
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| def can_write_eof(self) -> bool: | ||
| return True | ||
|
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| def get_extra_info(self, name: str, default: Any = None) -> Any: | ||
| """ | ||
| Get information about the underlying QUIC stream. | ||
| """ | ||
| if name == "connection": | ||
| return self.protocol._connection | ||
| elif name == "stream_id": | ||
| return self.stream_id | ||
|
|
||
| def write(self, data): | ||
| self.protocol._connection.send_stream_data(self.stream_id, data) | ||
| self.protocol._send_soon() | ||
|
|
||
| def write_eof(self): | ||
| self.protocol._connection.send_stream_data(self.stream_id, b"", end_stream=True) | ||
| self.protocol._send_soon() |
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