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89 lines
3.1 KiB
Python
89 lines
3.1 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 asyncio
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import logging
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from .common import Transport, StreamPacketSource
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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_tcp_server_transport(spec):
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'''
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Open a TCP 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 TcpServerTransport(Transport):
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async def close(self):
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await super().close()
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class TcpServerProtocol:
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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(f'connection from {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(f'connection lost: {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 TcpServerPacketSink:
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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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local_host, local_port = spec.split(':')
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packet_source = StreamPacketSource()
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packet_sink = TcpServerPacketSink()
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await asyncio.get_running_loop().create_server(
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lambda: TcpServerProtocol(packet_source, packet_sink),
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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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return TcpServerTransport(packet_source, packet_sink)
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