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67 lines
2.2 KiB
Python
67 lines
2.2 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, ParserSource
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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_udp_transport(spec):
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'''
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Open a UDP transport.
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The parameter string has this syntax:
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<local-host>:<local-port>,<remote-host>:<remote-port>
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Example: 0.0.0.0:9000,127.0.0.1:9001
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'''
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class UdpPacketSource(asyncio.DatagramProtocol, ParserSource):
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def datagram_received(self, data, addr):
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self.parser.feed_data(data)
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class UdpPacketSink:
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def __init__(self, transport):
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self.transport = transport
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def on_packet(self, packet):
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self.transport.sendto(packet)
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def close(self):
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self.transport.close()
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local, remote = spec.split(',')
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local_host, local_port = local.split(':')
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remote_host, remote_port = remote.split(':')
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(
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udp_transport,
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packet_source,
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) = await asyncio.get_running_loop().create_datagram_endpoint(
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UdpPacketSource,
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local_addr=(local_host, int(local_port)),
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remote_addr=(remote_host, int(remote_port)),
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)
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packet_sink = UdpPacketSink(udp_transport)
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return Transport(packet_source, packet_sink)
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