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306 lines
9.5 KiB
306 lines
9.5 KiB
from __future__ import print_function
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import gevent
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import socket
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import struct
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import time
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try:
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import nacl.secret
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except ImportError:
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print('WARNING: nacl is not installed, voice support is disabled')
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from holster.enum import Enum
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from holster.emitter import Emitter
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from disco.gateway.encoding.json import JSONEncoder
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from disco.util.websocket import Websocket
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from disco.util.logging import LoggingClass
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from disco.voice.packets import VoiceOPCode
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from disco.gateway.packets import OPCode
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VoiceState = Enum(
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DISCONNECTED=0,
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AWAITING_ENDPOINT=1,
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AUTHENTICATING=2,
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CONNECTING=3,
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CONNECTED=4,
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VOICE_CONNECTING=5,
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VOICE_CONNECTED=6,
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)
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class VoiceException(Exception):
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def __init__(self, msg, client):
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self.voice_client = client
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super(VoiceException, self).__init__(msg)
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class UDPVoiceClient(LoggingClass):
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def __init__(self, vc):
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super(UDPVoiceClient, self).__init__()
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self.vc = vc
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# The underlying UDP socket
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self.conn = None
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# Connection information
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self.ip = None
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self.port = None
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self.run_task = None
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self.connected = False
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def send_frame(self, frame, sequence=None, timestamp=None):
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# Convert the frame to a bytearray
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frame = bytearray(frame)
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# First, pack the header (TODO: reuse bytearray?)
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header = bytearray(24)
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header[0] = 0x80
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header[1] = 0x78
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struct.pack_into('>H', header, 2, sequence or self.vc.sequence)
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struct.pack_into('>I', header, 4, timestamp or self.vc.timestamp)
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struct.pack_into('>i', header, 8, self.vc.ssrc)
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# Now encrypt the payload with the nonce as a header
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raw = self.vc.secret_box.encrypt(bytes(frame), bytes(header)).ciphertext
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# Send the header (sans nonce padding) plus the payload
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self.send(header[:12] + raw)
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# Increment our sequence counter
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self.vc.sequence += 1
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if self.vc.sequence >= 65535:
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self.vc.sequence = 0
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def run(self):
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while True:
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self.conn.recvfrom(4096)
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def send(self, data):
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self.conn.sendto(data, (self.ip, self.port))
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def disconnect(self):
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self.run_task.kill()
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def connect(self, host, port, timeout=10, addrinfo=None):
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self.ip = socket.gethostbyname(host)
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self.port = port
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self.conn = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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if addrinfo:
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ip, port = addrinfo
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else:
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# Send discovery packet
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packet = bytearray(70)
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struct.pack_into('>I', packet, 0, self.vc.ssrc)
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self.send(packet)
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# Wait for a response
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try:
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data, addr = gevent.spawn(lambda: self.conn.recvfrom(70)).get(timeout=timeout)
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except gevent.Timeout:
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return (None, None)
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# Read IP and port
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ip = str(data[4:]).split('\x00', 1)[0]
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port = struct.unpack('<H', data[-2:])[0]
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# Spawn read thread so we don't max buffers
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self.connected = True
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self.run_task = gevent.spawn(self.run)
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return (ip, port)
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class VoiceClient(LoggingClass):
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def __init__(self, channel, encoder=None):
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super(VoiceClient, self).__init__()
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if not channel.is_voice:
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raise ValueError('Cannot spawn a VoiceClient for a non-voice channel')
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self.channel = channel
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self.client = self.channel.client
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self.encoder = encoder or JSONEncoder
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# Bind to some WS packets
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self.packets = Emitter(gevent.spawn)
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self.packets.on(VoiceOPCode.READY, self.on_voice_ready)
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self.packets.on(VoiceOPCode.SESSION_DESCRIPTION, self.on_voice_sdp)
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# State + state change emitter
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self.state = VoiceState.DISCONNECTED
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self.state_emitter = Emitter(gevent.spawn)
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# Connection metadata
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self.token = None
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self.endpoint = None
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self.ssrc = None
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self.port = None
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self.secret_box = None
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self.udp = None
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# Voice data state
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self.sequence = 0
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self.timestamp = 0
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self.update_listener = None
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# Websocket connection
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self.ws = None
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self.heartbeat_task = None
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def __repr__(self):
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return u'<VoiceClient {}>'.format(self.channel)
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def set_state(self, state):
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self.log.debug('[%s] state %s -> %s', self, self.state, state)
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prev_state = self.state
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self.state = state
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self.state_emitter.emit(state, prev_state)
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def heartbeat(self, interval):
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while True:
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self.send(VoiceOPCode.HEARTBEAT, time.time() * 1000)
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gevent.sleep(interval / 1000)
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def set_speaking(self, value):
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self.send(VoiceOPCode.SPEAKING, {
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'speaking': value,
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'delay': 0,
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})
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def send(self, op, data):
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self.log.debug('[%s] sending OP %s (data = %s)', self, op, data)
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self.ws.send(self.encoder.encode({
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'op': op.value,
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'd': data,
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}), self.encoder.OPCODE)
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def on_voice_ready(self, data):
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self.log.info('[%s] Recived Voice READY payload, attempting to negotiate voice connection w/ remote', self)
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self.set_state(VoiceState.CONNECTING)
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self.ssrc = data['ssrc']
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self.port = data['port']
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self.heartbeat_task = gevent.spawn(self.heartbeat, data['heartbeat_interval'])
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self.log.debug('[%s] Attempting IP discovery over UDP to %s:%s', self, self.endpoint, self.port)
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self.udp = UDPVoiceClient(self)
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ip, port = self.udp.connect(self.endpoint, self.port)
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if not ip:
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self.log.error('Failed to discover our IP, perhaps a NAT or firewall is fucking us')
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self.disconnect()
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return
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self.log.debug('[%s] IP discovery completed (ip = %s, port = %s), sending SELECT_PROTOCOL', self, ip, port)
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self.send(VoiceOPCode.SELECT_PROTOCOL, {
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'protocol': 'udp',
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'data': {
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'port': port,
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'address': ip,
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'mode': 'xsalsa20_poly1305'
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}
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})
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def on_voice_sdp(self, sdp):
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self.log.info('[%s] Recieved session description, connection completed', self)
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# Create a secret box for encryption/decryption
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self.secret_box = nacl.secret.SecretBox(bytes(bytearray(sdp['secret_key'])))
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# Toggle speaking state so clients learn of our SSRC
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self.set_speaking(True)
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self.set_speaking(False)
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gevent.sleep(0.25)
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self.set_state(VoiceState.CONNECTED)
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def on_voice_server_update(self, data):
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if self.channel.guild_id != data.guild_id or not data.token:
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return
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if self.token and self.token != data.token:
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return
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self.log.info('[%s] Recieved VOICE_SERVER_UPDATE (state = %s / endpoint = %s)', self, self.state, data.endpoint)
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self.token = data.token
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self.set_state(VoiceState.AUTHENTICATING)
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self.endpoint = data.endpoint.split(':', 1)[0]
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self.ws = Websocket('wss://' + self.endpoint)
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self.ws.emitter.on('on_open', self.on_open)
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self.ws.emitter.on('on_error', self.on_error)
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self.ws.emitter.on('on_close', self.on_close)
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self.ws.emitter.on('on_message', self.on_message)
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self.ws.run_forever()
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def on_message(self, msg):
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try:
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data = self.encoder.decode(msg)
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self.packets.emit(VoiceOPCode[data['op']], data['d'])
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except:
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self.log.exception('Failed to parse voice gateway message: ')
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def on_error(self, err):
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# TODO: raise an exception here
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self.log.error('[%s] Voice websocket error: %s', self, err)
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def on_open(self):
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self.send(VoiceOPCode.IDENTIFY, {
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'server_id': self.channel.guild_id,
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'user_id': self.client.state.me.id,
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'session_id': self.client.gw.session_id,
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'token': self.token
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})
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def on_close(self, code, error):
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self.log.warning('[%s] Voice websocket disconnected (%s, %s)', self, code, error)
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if self.state == VoiceState.CONNECTED:
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self.log.info('Attempting voice reconnection')
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self.connect()
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def connect(self, timeout=5, mute=False, deaf=False):
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self.log.debug('[%s] Attempting connection', self)
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self.set_state(VoiceState.AWAITING_ENDPOINT)
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self.update_listener = self.client.events.on('VoiceServerUpdate', self.on_voice_server_update)
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self.client.gw.send(OPCode.VOICE_STATE_UPDATE, {
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'self_mute': mute,
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'self_deaf': deaf,
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'guild_id': int(self.channel.guild_id),
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'channel_id': int(self.channel.id),
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})
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if not self.state_emitter.once(VoiceState.CONNECTED, timeout=timeout):
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raise VoiceException('Failed to connect to voice', self)
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def disconnect(self):
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self.log.debug('[%s] disconnect called', self)
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self.set_state(VoiceState.DISCONNECTED)
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if self.heartbeat_task:
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self.heartbeat_task.kill()
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self.heartbeat_task = None
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if self.ws and self.ws.sock.connected:
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self.ws.close()
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if self.udp and self.udp.connected:
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self.udp.disconnect()
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self.client.gw.send(OPCode.VOICE_STATE_UPDATE, {
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'self_mute': False,
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'self_deaf': False,
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'guild_id': int(self.channel.guild_id),
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'channel_id': None,
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})
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def send_frame(self, *args, **kwargs):
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self.udp.send_frame(*args, **kwargs)
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