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libdatachannel/examples/signaling-server-python/signaling-server.py

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Python
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#!/usr/bin/env python
#
# Python signaling server example for libdatachannel
# Copyright (c) 2020 Paul-Louis Ageneau
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import sys
import ssl
import json
import asyncio
import logging
import websockets
logger = logging.getLogger('websockets')
logger.setLevel(logging.INFO)
logger.addHandler(logging.StreamHandler(sys.stdout))
clients = {}
async def handle_websocket(websocket, path):
client_id = None
try:
splitted = path.split('/')
splitted.pop(0)
client_id = splitted.pop(0)
print('Client {} connected'.format(client_id))
clients[client_id] = websocket
while True:
data = await websocket.recv()
print('Client {} << {}'.format(client_id, data))
message = json.loads(data)
destination_id = message['id']
destination_websocket = clients.get(destination_id)
if destination_websocket:
message['id'] = client_id
data = json.dumps(message)
print('Client {} >> {}'.format(destination_id, data))
await destination_websocket.send(data)
else:
print('Client {} not found'.format(destination_id))
except Exception as e:
print(e)
finally:
if client_id:
del clients[client_id]
print('Client {} disconnected'.format(client_id))
if __name__ == '__main__':
# Usage: ./server.py [[host:]port] [SSL certificate file]
endpoint_or_port = sys.argv[1] if len(sys.argv) > 1 else "8000"
ssl_cert = sys.argv[2] if len(sys.argv) > 2 else None
endpoint = endpoint_or_port if ':' in endpoint_or_port else "127.0.0.1:" + endpoint_or_port
if ssl_cert:
ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
ssl_context.load_cert_chain(ssl_cert)
else:
ssl_context = None
print('Listening on {}'.format(endpoint))
host, port = endpoint.rsplit(':', 1)
start_server = websockets.serve(handle_websocket, host, int(port), ssl=ssl_context)
asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()