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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, StreamPacketSink
# -----------------------------------------------------------------------------
# Logging
# -----------------------------------------------------------------------------
logger = logging.getLogger(__name__)
# -----------------------------------------------------------------------------
async def open_tcp_client_transport(spec):
'''
Open a TCP client transport.
The parameter string has this syntax:
<remote-host>:<remote-port>
Example: 127.0.0.1:9001
'''
class TcpPacketSource(StreamPacketSource):
def connection_lost(self, exc):
logger.debug(f'connection lost: {exc}')
self.terminated.set_result(exc)
remote_host, remote_port = spec.split(':')
tcp_transport, packet_source = await asyncio.get_running_loop().create_connection(
TcpPacketSource,
host=remote_host,
port=int(remote_port),
)
packet_sink = StreamPacketSink(tcp_transport)
return Transport(packet_source, packet_sink)
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