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# Copyright 2021-2024 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
import asyncio
import logging
from bumble.transport.common import StreamPacketSink, StreamPacketSource, Transport
# -----------------------------------------------------------------------------
# Logging
# -----------------------------------------------------------------------------
logger = logging.getLogger(__name__)
# -----------------------------------------------------------------------------
async def open_unix_client_transport(spec: str) -> Transport:
'''Open a UNIX socket client transport.
The parameter is the path of unix socket. For abstract socket, the first character
needs to be '@'.
Example:
* /tmp/hci.socket
* @hci_socket
'''
class UnixPacketSource(StreamPacketSource):
def connection_lost(self, exc):
logger.debug(f'connection lost: {exc}')
self.on_transport_lost()
# For abstract socket, the first character should be null character.
if spec.startswith('@'):
spec = '\0' + spec[1:]
(
unix_transport,
packet_source,
) = await asyncio.get_running_loop().create_unix_connection(UnixPacketSource, spec)
packet_sink = StreamPacketSink(unix_transport)
return Transport(packet_source, packet_sink)
# -----------------------------------------------------------------------------
async def open_unix_server_transport(spec: str) -> Transport:
'''Open a UNIX socket server transport.
The parameter is the path of unix socket. For abstract socket, the first character
needs to be '@'.
Example:
* /tmp/hci.socket
* @hci_socket
'''
# For abstract socket, the first character should be null character.
if spec.startswith('@'):
spec = '\0' + spec[1:]
class UnixServerTransport(Transport):
def __init__(self, source, sink, server):
self.server = server
super().__init__(source, sink)
async def close(self):
await super().close()
class UnixServerProtocol(asyncio.BaseProtocol):
def __init__(self, packet_source, packet_sink):
self.packet_source = packet_source
self.packet_sink = packet_sink
# Called when a new connection is established
def connection_made(self, transport):
peer_name = transport.get_extra_info('peer_name')
logger.debug('connection from %s', peer_name)
self.packet_sink.transport = transport
# Called when the client is disconnected
def connection_lost(self, error):
logger.debug('connection lost: %s', error)
self.packet_sink.transport = None
def eof_received(self):
logger.debug('connection end')
self.packet_sink.transport = None
# Called when data is received on the socket
def data_received(self, data):
self.packet_source.data_received(data)
class UnixServerPacketSink:
def __init__(self):
self.transport = None
def on_packet(self, packet):
if self.transport:
self.transport.write(packet)
else:
logger.debug('no client, dropping packet')
packet_source = StreamPacketSource()
packet_sink = UnixServerPacketSink()
server = await asyncio.get_running_loop().create_unix_server(
lambda: UnixServerProtocol(packet_source, packet_sink), spec
)
return UnixServerTransport(packet_source, packet_sink, server)
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