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# Copyright 2021-2022 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 .common import Transport, StreamPacketSource
# -----------------------------------------------------------------------------
# Logging
# -----------------------------------------------------------------------------
logger = logging.getLogger(__name__)
# -----------------------------------------------------------------------------
async def open_tcp_server_transport(spec):
'''
Open a TCP server transport.
The parameter string has this syntax:
<local-host>:<local-port>
Where <local-host> may be the address of a local network interface, or '_'
to accept connections on all local network interfaces.
Example: _:9001
'''
class TcpServerTransport(Transport):
async def close(self):
await super().close()
class TcpServerProtocol:
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(f'connection from {peer_name}')
self.packet_sink.transport = transport
# Called when the client is disconnected
def connection_lost(self, error):
logger.debug(f'connection lost: {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 TcpServerPacketSink:
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')
local_host, local_port = spec.split(':')
packet_source = StreamPacketSource()
packet_sink = TcpServerPacketSink()
await asyncio.get_running_loop().create_server(
lambda: TcpServerProtocol(packet_source, packet_sink),
host=local_host if local_host != '_' else None,
port=int(local_port),
)
return TcpServerTransport(packet_source, packet_sink)
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