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123 lines
4.1 KiB
Python
123 lines
4.1 KiB
Python
# Copyright 2021-2024 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 asyncio
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import logging
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from bumble.transport.common import StreamPacketSink, StreamPacketSource, 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_unix_client_transport(spec: str) -> Transport:
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'''Open a UNIX socket client transport.
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The parameter is the path of unix socket. For abstract socket, the first character
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needs to be '@'.
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Example:
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* /tmp/hci.socket
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* @hci_socket
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'''
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class UnixPacketSource(StreamPacketSource):
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def connection_lost(self, exc):
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logger.debug(f'connection lost: {exc}')
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self.on_transport_lost()
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# For abstract socket, the first character should be null character.
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if spec.startswith('@'):
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spec = '\0' + spec[1:]
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(
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unix_transport,
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packet_source,
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) = await asyncio.get_running_loop().create_unix_connection(UnixPacketSource, spec)
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packet_sink = StreamPacketSink(unix_transport)
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return Transport(packet_source, packet_sink)
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# -----------------------------------------------------------------------------
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async def open_unix_server_transport(spec: str) -> Transport:
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'''Open a UNIX socket server transport.
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The parameter is the path of unix socket. For abstract socket, the first character
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needs to be '@'.
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Example:
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* /tmp/hci.socket
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* @hci_socket
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'''
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# For abstract socket, the first character should be null character.
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if spec.startswith('@'):
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spec = '\0' + spec[1:]
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class UnixServerTransport(Transport):
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def __init__(self, source, sink, server):
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self.server = server
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super().__init__(source, sink)
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async def close(self):
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await super().close()
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class UnixServerProtocol(asyncio.BaseProtocol):
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def __init__(self, packet_source, packet_sink):
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self.packet_source = packet_source
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self.packet_sink = packet_sink
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# Called when a new connection is established
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def connection_made(self, transport):
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peer_name = transport.get_extra_info('peer_name')
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logger.debug('connection from %s', peer_name)
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self.packet_sink.transport = transport
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# Called when the client is disconnected
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def connection_lost(self, error):
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logger.debug('connection lost: %s', error)
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self.packet_sink.transport = None
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def eof_received(self):
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logger.debug('connection end')
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self.packet_sink.transport = None
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# Called when data is received on the socket
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def data_received(self, data):
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self.packet_source.data_received(data)
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class UnixServerPacketSink:
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def __init__(self):
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self.transport = None
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def on_packet(self, packet):
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if self.transport:
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self.transport.write(packet)
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else:
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logger.debug('no client, dropping packet')
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packet_source = StreamPacketSource()
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packet_sink = UnixServerPacketSink()
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server = await asyncio.get_running_loop().create_unix_server(
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lambda: UnixServerProtocol(packet_source, packet_sink), spec
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)
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return UnixServerTransport(packet_source, packet_sink, server)
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