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97 lines
3.6 KiB
Python
97 lines
3.6 KiB
Python
# Copyright 2021-2022 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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import logging
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import websockets.asyncio.server
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from bumble.transport.common import ParserSource, PumpedPacketSink, Transport
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# -----------------------------------------------------------------------------
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# Logging
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# -----------------------------------------------------------------------------
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logger = logging.getLogger(__name__)
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# -----------------------------------------------------------------------------
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async def open_ws_server_transport(spec: str) -> Transport:
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'''
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Open a WebSocket server transport.
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The parameter string has this syntax:
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<local-host>:<local-port>
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Where <local-host> may be the address of a local network interface, or '_'
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to accept connections on all local network interfaces.
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Example: _:9001
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'''
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class WsServerTransport(Transport):
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sink: PumpedPacketSink
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source: ParserSource
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connection: websockets.asyncio.server.ServerConnection | None
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server: websockets.asyncio.server.Server | None
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def __init__(self) -> None:
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source = ParserSource()
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sink = PumpedPacketSink(self.send_packet)
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self.connection = None
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self.server = None
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super().__init__(source, sink)
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async def serve(self, local_host: str, local_port: str) -> None:
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self.sink.start()
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# pylint: disable-next=no-member
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self.server = await websockets.asyncio.server.serve(
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handler=self.on_connection,
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host=local_host if local_host != '_' else None,
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port=int(local_port),
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)
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logger.debug(f'websocket server ready on port {local_port}')
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async def on_connection(
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self, connection: websockets.asyncio.server.ServerConnection
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) -> None:
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logger.debug(
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f'new connection on {connection.local_address} '
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f'from {connection.remote_address}'
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)
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self.connection = connection
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# pylint: disable=no-member
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try:
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async for packet in connection:
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if isinstance(packet, bytes):
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self.source.parser.feed_data(packet)
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else:
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logger.warning('discarding packet: not a BINARY frame')
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except websockets.WebSocketException as error:
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logger.debug(f'exception while receiving packet: {error}')
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# We're now disconnected
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self.connection = None
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async def send_packet(self, packet: bytes) -> None:
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if self.connection is None:
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logger.debug('no connection, dropping packet')
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return
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await self.connection.send(packet)
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local_host, local_port = spec.rsplit(':', maxsplit=1)
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transport = WsServerTransport()
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await transport.serve(local_host, local_port)
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return transport
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