mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-23 04:20:17 +00:00
279 lines
11 KiB
Python
Executable file
279 lines
11 KiB
Python
Executable file
#!/usr/bin/env python3
|
|
#
|
|
# Example 1-1 call signalling server
|
|
#
|
|
# Copyright (C) 2017 Centricular Ltd.
|
|
#
|
|
# Author: Nirbheek Chauhan <nirbheek@centricular.com>
|
|
#
|
|
|
|
import os
|
|
import sys
|
|
import ssl
|
|
import logging
|
|
import asyncio
|
|
import websockets
|
|
import argparse
|
|
|
|
from concurrent.futures._base import TimeoutError
|
|
|
|
parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter)
|
|
parser.add_argument('--addr', default='0.0.0.0', help='Address to listen on')
|
|
parser.add_argument('--port', default=8443, type=int, help='Port to listen on')
|
|
parser.add_argument('--keepalive-timeout', dest='keepalive_timeout', default=30, type=int, help='Timeout for keepalive (in seconds)')
|
|
parser.add_argument('--cert-path', default=os.path.dirname(__file__))
|
|
parser.add_argument('--disable-ssl', default=False, help='Disable ssl', action='store_true')
|
|
|
|
options = parser.parse_args(sys.argv[1:])
|
|
|
|
ADDR_PORT = (options.addr, options.port)
|
|
KEEPALIVE_TIMEOUT = options.keepalive_timeout
|
|
|
|
############### Global data ###############
|
|
|
|
# Format: {uid: (Peer WebSocketServerProtocol,
|
|
# remote_address,
|
|
# <'session'|room_id|None>)}
|
|
peers = dict()
|
|
# Format: {caller_uid: callee_uid,
|
|
# callee_uid: caller_uid}
|
|
# Bidirectional mapping between the two peers
|
|
sessions = dict()
|
|
# Format: {room_id: {peer1_id, peer2_id, peer3_id, ...}}
|
|
# Room dict with a set of peers in each room
|
|
rooms = dict()
|
|
|
|
############### Helper functions ###############
|
|
|
|
async def recv_msg_ping(ws, raddr):
|
|
'''
|
|
Wait for a message forever, and send a regular ping to prevent bad routers
|
|
from closing the connection.
|
|
'''
|
|
msg = None
|
|
while msg is None:
|
|
try:
|
|
msg = await asyncio.wait_for(ws.recv(), KEEPALIVE_TIMEOUT)
|
|
except TimeoutError:
|
|
print('Sending keepalive ping to {!r} in recv'.format(raddr))
|
|
await ws.ping()
|
|
return msg
|
|
|
|
async def disconnect(ws, peer_id):
|
|
'''
|
|
Remove @peer_id from the list of sessions and close our connection to it.
|
|
This informs the peer that the session and all calls have ended, and it
|
|
must reconnect.
|
|
'''
|
|
global sessions
|
|
if peer_id in sessions:
|
|
del sessions[peer_id]
|
|
# Close connection
|
|
if ws and ws.open:
|
|
# Don't care about errors
|
|
asyncio.ensure_future(ws.close(reason='hangup'))
|
|
|
|
async def cleanup_session(uid):
|
|
if uid in sessions:
|
|
other_id = sessions[uid]
|
|
del sessions[uid]
|
|
print("Cleaned up {} session".format(uid))
|
|
if other_id in sessions:
|
|
del sessions[other_id]
|
|
print("Also cleaned up {} session".format(other_id))
|
|
# If there was a session with this peer, also
|
|
# close the connection to reset its state.
|
|
if other_id in peers:
|
|
print("Closing connection to {}".format(other_id))
|
|
wso, oaddr, _ = peers[other_id]
|
|
del peers[other_id]
|
|
await wso.close()
|
|
|
|
async def cleanup_room(uid, room_id):
|
|
room_peers = rooms[room_id]
|
|
if uid not in room_peers:
|
|
return
|
|
room_peers.remove(uid)
|
|
for pid in room_peers:
|
|
wsp, paddr, _ = peers[pid]
|
|
msg = 'ROOM_PEER_LEFT {}'.format(uid)
|
|
print('room {}: {} -> {}: {}'.format(room_id, uid, pid, msg))
|
|
await wsp.send(msg)
|
|
|
|
async def remove_peer(uid):
|
|
await cleanup_session(uid)
|
|
if uid in peers:
|
|
ws, raddr, status = peers[uid]
|
|
if status and status != 'session':
|
|
await cleanup_room(uid, status)
|
|
del peers[uid]
|
|
await ws.close()
|
|
print("Disconnected from peer {!r} at {!r}".format(uid, raddr))
|
|
|
|
############### Handler functions ###############
|
|
|
|
async def connection_handler(ws, uid):
|
|
global peers, sessions, rooms
|
|
raddr = ws.remote_address
|
|
peer_status = None
|
|
peers[uid] = [ws, raddr, peer_status]
|
|
print("Registered peer {!r} at {!r}".format(uid, raddr))
|
|
while True:
|
|
# Receive command, wait forever if necessary
|
|
msg = await recv_msg_ping(ws, raddr)
|
|
# Update current status
|
|
peer_status = peers[uid][2]
|
|
# We are in a session or a room, messages must be relayed
|
|
if peer_status is not None:
|
|
# We're in a session, route message to connected peer
|
|
if peer_status == 'session':
|
|
other_id = sessions[uid]
|
|
wso, oaddr, status = peers[other_id]
|
|
assert(status == 'session')
|
|
print("{} -> {}: {}".format(uid, other_id, msg))
|
|
await wso.send(msg)
|
|
# We're in a room, accept room-specific commands
|
|
elif peer_status:
|
|
# ROOM_PEER_MSG peer_id MSG
|
|
if msg.startswith('ROOM_PEER_MSG'):
|
|
_, other_id, msg = msg.split(maxsplit=2)
|
|
if other_id not in peers:
|
|
await ws.send('ERROR peer {!r} not found'
|
|
''.format(other_id))
|
|
continue
|
|
wso, oaddr, status = peers[other_id]
|
|
if status != room_id:
|
|
await ws.send('ERROR peer {!r} is not in the room'
|
|
''.format(other_id))
|
|
continue
|
|
msg = 'ROOM_PEER_MSG {} {}'.format(uid, msg)
|
|
print('room {}: {} -> {}: {}'.format(room_id, uid, other_id, msg))
|
|
await wso.send(msg)
|
|
elif msg == 'ROOM_PEER_LIST':
|
|
room_id = peers[peer_id][2]
|
|
room_peers = ' '.join([pid for pid in rooms[room_id] if pid != peer_id])
|
|
msg = 'ROOM_PEER_LIST {}'.format(room_peers)
|
|
print('room {}: -> {}: {}'.format(room_id, uid, msg))
|
|
await ws.send(msg)
|
|
else:
|
|
await ws.send('ERROR invalid msg, already in room')
|
|
continue
|
|
else:
|
|
raise AssertionError('Unknown peer status {!r}'.format(peer_status))
|
|
# Requested a session with a specific peer
|
|
elif msg.startswith('SESSION'):
|
|
print("{!r} command {!r}".format(uid, msg))
|
|
_, callee_id = msg.split(maxsplit=1)
|
|
if callee_id not in peers:
|
|
await ws.send('ERROR peer {!r} not found'.format(callee_id))
|
|
continue
|
|
if peer_status is not None:
|
|
await ws.send('ERROR peer {!r} busy'.format(callee_id))
|
|
continue
|
|
await ws.send('SESSION_OK')
|
|
wsc = peers[callee_id][0]
|
|
print('Session from {!r} ({!r}) to {!r} ({!r})'
|
|
''.format(uid, raddr, callee_id, wsc.remote_address))
|
|
# Register session
|
|
peers[uid][2] = peer_status = 'session'
|
|
sessions[uid] = callee_id
|
|
peers[callee_id][2] = 'session'
|
|
sessions[callee_id] = uid
|
|
# Requested joining or creation of a room
|
|
elif msg.startswith('ROOM'):
|
|
print('{!r} command {!r}'.format(uid, msg))
|
|
_, room_id = msg.split(maxsplit=1)
|
|
# Room name cannot be 'session', empty, or contain whitespace
|
|
if room_id == 'session' or room_id.split() != [room_id]:
|
|
await ws.send('ERROR invalid room id {!r}'.format(room_id))
|
|
continue
|
|
if room_id in rooms:
|
|
if uid in rooms[room_id]:
|
|
raise AssertionError('How did we accept a ROOM command '
|
|
'despite already being in a room?')
|
|
else:
|
|
# Create room if required
|
|
rooms[room_id] = set()
|
|
room_peers = ' '.join([pid for pid in rooms[room_id]])
|
|
await ws.send('ROOM_OK {}'.format(room_peers))
|
|
# Enter room
|
|
peers[uid][2] = peer_status = room_id
|
|
rooms[room_id].add(uid)
|
|
for pid in rooms[room_id]:
|
|
if pid == uid:
|
|
continue
|
|
wsp, paddr, _ = peers[pid]
|
|
msg = 'ROOM_PEER_JOINED {}'.format(uid)
|
|
print('room {}: {} -> {}: {}'.format(room_id, uid, pid, msg))
|
|
await wsp.send(msg)
|
|
else:
|
|
print('Ignoring unknown message {!r} from {!r}'.format(msg, uid))
|
|
|
|
async def hello_peer(ws):
|
|
'''
|
|
Exchange hello, register peer
|
|
'''
|
|
raddr = ws.remote_address
|
|
hello = await ws.recv()
|
|
hello, uid = hello.split(maxsplit=1)
|
|
if hello != 'HELLO':
|
|
await ws.close(code=1002, reason='invalid protocol')
|
|
raise Exception("Invalid hello from {!r}".format(raddr))
|
|
if not uid or uid in peers or uid.split() != [uid]: # no whitespace
|
|
await ws.close(code=1002, reason='invalid peer uid')
|
|
raise Exception("Invalid uid {!r} from {!r}".format(uid, raddr))
|
|
# Send back a HELLO
|
|
await ws.send('HELLO')
|
|
return uid
|
|
|
|
async def handler(ws, path):
|
|
'''
|
|
All incoming messages are handled here. @path is unused.
|
|
'''
|
|
raddr = ws.remote_address
|
|
print("Connected to {!r}".format(raddr))
|
|
peer_id = await hello_peer(ws)
|
|
try:
|
|
await connection_handler(ws, peer_id)
|
|
except websockets.ConnectionClosed:
|
|
print("Connection to peer {!r} closed, exiting handler".format(raddr))
|
|
finally:
|
|
await remove_peer(peer_id)
|
|
|
|
sslctx = None
|
|
if not options.disable_ssl:
|
|
# Create an SSL context to be used by the websocket server
|
|
certpath = options.cert_path
|
|
print('Using TLS with keys in {!r}'.format(certpath))
|
|
if 'letsencrypt' in certpath:
|
|
chain_pem = os.path.join(certpath, 'fullchain.pem')
|
|
key_pem = os.path.join(certpath, 'privkey.pem')
|
|
else:
|
|
chain_pem = os.path.join(certpath, 'cert.pem')
|
|
key_pem = os.path.join(certpath, 'key.pem')
|
|
|
|
sslctx = ssl.create_default_context()
|
|
try:
|
|
sslctx.load_cert_chain(chain_pem, keyfile=key_pem)
|
|
except FileNotFoundError:
|
|
print("Certificates not found, did you run generate_cert.sh?")
|
|
sys.exit(1)
|
|
# FIXME
|
|
sslctx.check_hostname = False
|
|
sslctx.verify_mode = ssl.CERT_NONE
|
|
|
|
print("Listening on https://{}:{}".format(*ADDR_PORT))
|
|
# Websocket server
|
|
wsd = websockets.serve(handler, *ADDR_PORT, ssl=sslctx,
|
|
# Maximum number of messages that websockets will pop
|
|
# off the asyncio and OS buffers per connection. See:
|
|
# https://websockets.readthedocs.io/en/stable/api.html#websockets.protocol.WebSocketCommonProtocol
|
|
max_queue=16)
|
|
|
|
logger = logging.getLogger('websockets.server')
|
|
|
|
logger.setLevel(logging.ERROR)
|
|
logger.addHandler(logging.StreamHandler())
|
|
|
|
asyncio.get_event_loop().run_until_complete(wsd)
|
|
asyncio.get_event_loop().run_forever()
|