# -*- coding: utf-8 -*-
"""
The MIT License (MIT)
Copyright (c) 2015-2017 Rapptz
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
"""
import sys
import time
import websockets
import asyncio
import aiohttp
from . import utils, compat
from .enums import Status, try_enum
from .game import Game
from .errors import GatewayNotFound, ConnectionClosed, InvalidArgument
import logging
import zlib, time, json
from collections import namedtuple
import threading
import struct
log = logging.getLogger(__name__)
__all__ = [ 'DiscordWebSocket', 'KeepAliveHandler', 'VoiceKeepAliveHandler',
'DiscordVoiceWebSocket', 'ResumeWebSocket' ]
class ResumeWebSocket(Exception):
"""Signals to initialise via RESUME opcode instead of IDENTIFY."""
def __init__(self, shard_id):
self.shard_id = shard_id
EventListener = namedtuple('EventListener', 'predicate event result future')
class KeepAliveHandler(threading.Thread):
def __init__(self, *args, **kwargs):
ws = kwargs.pop('ws', None)
interval = kwargs.pop('interval', None)
shard_id = kwargs.pop('shard_id', None)
threading.Thread.__init__(self, *args, **kwargs)
self.ws = ws
self.interval = interval
self.daemon = True
self.shard_id = shard_id
self.msg = 'Keeping websocket alive with sequence {0[d]}'
self._stop_ev = threading.Event()
self._last_ack = time.time()
def run(self):
while not self._stop_ev.wait(self.interval):
if self._last_ack + 2 * self.interval < time.time():
log.warn("Shard ID %s has stopped responding to the gateway." % self.shard_id)
coro = self.ws.close(1006)
f = compat.run_coroutine_threadsafe(coro, loop=self.ws.loop)
try:
f.result()
except:
pass
finally:
self.stop()
return
data = self.get_payload()
log.debug(self.msg.format(data))
coro = self.ws.send_as_json(data)
f = compat.run_coroutine_threadsafe(coro, loop=self.ws.loop)
try:
# block until sending is complete
f.result()
except Exception:
self.stop()
def get_payload(self):
return {
'op': self.ws.HEARTBEAT,
'd': self.ws.sequence
}
def stop(self):
self._stop_ev.set()
def ack(self):
self._last_ack = time.time()
class VoiceKeepAliveHandler(KeepAliveHandler):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.msg = 'Keeping voice websocket alive with timestamp {0[d]}'
def get_payload(self):
self.ack()
return {
'op': self.ws.HEARTBEAT,
'd': int(time.time() * 1000)
}
class DiscordWebSocket(websockets.client.WebSocketClientProtocol):
"""Implements a WebSocket for Discord's gateway v6.
This is created through :func:`create_main_websocket`. Library
users should never create this manually.
Attributes
-----------
DISPATCH
Receive only. Denotes an event to be sent to Discord, such as READY.
HEARTBEAT
When received tells Discord to keep the connection alive.
When sent asks if your connection is currently alive.
IDENTIFY
Send only. Starts a new session.
PRESENCE
Send only. Updates your presence.
VOICE_STATE
Send only. Starts a new connection to a voice guild.
VOICE_PING
Send only. Checks ping time to a voice guild, do not use.
RESUME
Send only. Resumes an existing connection.
RECONNECT
Receive only. Tells the client to reconnect to a new gateway.
REQUEST_MEMBERS
Send only. Asks for the full member list of a guild.
INVALIDATE_SESSION
Receive only. Tells the client to optionally invalidate the session
and IDENTIFY again.
HELLO
Receive only. Tells the client the heartbeat interval.
HEARTBEAT_ACK
Receive only. Confirms receiving of a heartbeat. Not having it implies
a connection issue.
GUILD_SYNC
Send only. Requests a guild sync.
gateway
The gateway we are currently connected to.
token
The authentication token for discord.
"""
DISPATCH = 0
HEARTBEAT = 1
IDENTIFY = 2
PRESENCE = 3
VOICE_STATE = 4
VOICE_PING = 5
RESUME = 6
RECONNECT = 7
REQUEST_MEMBERS = 8
INVALIDATE_SESSION = 9
HELLO = 10
HEARTBEAT_ACK = 11
GUILD_SYNC = 12
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.max_size = None
# an empty dispatcher to prevent crashes
self._dispatch = lambda *args: None
# generic event listeners
self._dispatch_listeners = []
# the keep alive
self._keep_alive = None
# ws related stuff
self.session_id = None
self.sequence = None
@classmethod
@asyncio.coroutine
def from_client(cls, client, *, shard_id=None, session=None, sequence=None, resume=False):
"""Creates a main websocket for Discord from a :class:`Client`.
This is for internal use only.
"""
gateway = yield from client.http.get_gateway()
ws = yield from websockets.connect(gateway, loop=client.loop, klass=cls)
# dynamically add attributes needed
ws.token = client.http.token
ws._connection = client.connection
ws._dispatch = client.dispatch
ws.gateway = gateway
ws.shard_id = shard_id
ws.shard_count = client.connection.shard_count
ws.session_id = session
ws.sequence = sequence
client.connection._update_references(ws)
log.info('Created websocket connected to {}'.format(gateway))
# poll event for OP Hello
yield from ws.poll_event()
if not resume:
yield from ws.identify()
log.info('sent the identify payload to create the websocket')
return ws
yield from ws.resume()
log.info('sent the resume payload to create the websocket')
try:
yield from ws.ensure_open()
except websockets.exceptions.ConnectionClosed:
# ws got closed so let's just do a regular IDENTIFY connect.
log.info('RESUME failure.')
return (yield from cls.from_client(client))
else:
return ws
def wait_for(self, event, predicate, result=None):
"""Waits for a DISPATCH'd event that meets the predicate.
Parameters
-----------
event : str
The event name in all upper case to wait for.
predicate
A function that takes a data parameter to check for event
properties. The data parameter is the 'd' key in the JSON message.
result
A function that takes the same data parameter and executes to send
the result to the future. If None, returns the data.
Returns
--------
asyncio.Future
A future to wait for.
"""
future = compat.create_future(self.loop)
entry = EventListener(event=event, predicate=predicate, result=result, future=future)
self._dispatch_listeners.append(entry)
return future
@asyncio.coroutine
def identify(self):
"""Sends the IDENTIFY packet."""
payload = {
'op': self.IDENTIFY,
'd': {
'token': self.token,
'properties': {
'$os': sys.platform,
'$browser': 'discord.py',
'$device': 'discord.py',
'$referrer': '',
'$referring_domain': ''
},
'compress': True,
'large_threshold': 250,
'v': 3
}
}
if not self._connection.is_bot:
payload['d']['synced_guilds'] = []
if self.shard_id is not None and self.shard_count is not None:
payload['d']['shard'] = [self.shard_id, self.shard_count]
yield from self.send_as_json(payload)
@asyncio.coroutine
def resume(self):
"""Sends the RESUME packet."""
payload = {
'op': self.RESUME,
'd': {
'seq': self.sequence,
'session_id': self.session_id,
'token': self.token
}
}
yield from self.send_as_json(payload)
@asyncio.coroutine
def received_message(self, msg):
self._dispatch('socket_raw_receive', msg)
if isinstance(msg, bytes):
msg = zlib.decompress(msg, 15, 10490000) # This is 10 MiB
msg = msg.decode('utf-8')
msg = json.loads(msg)
log.debug('For Shard ID {}: WebSocket Event: {}'.format(self.shard_id, msg))
self._dispatch('socket_response', msg)
op = msg.get('op')
data = msg.get('d')
seq = msg.get('s')
if seq is not None:
self.sequence = seq
if op == self.RECONNECT:
# "reconnect" can only be handled by the Client
# so we terminate our connection and raise an
# internal exception signalling to reconnect.
log.info('Received RECONNECT opcode.')
yield from self.close()
raise ResumeWebSocket(self.shard_id)
if op == self.HEARTBEAT_ACK:
self._keep_alive.ack()
return
if op == self.HEARTBEAT:
beat = self._keep_alive.get_payload()
yield from self.send_as_json(beat)
return
if op == self.HELLO:
interval = data['heartbeat_interval'] / 1000.0
self._keep_alive = KeepAliveHandler(ws=self, interval=interval, shard_id=self.shard_id)
self._keep_alive.start()
return
if op == self.INVALIDATE_SESSION:
if data == True:
yield from self.close()
raise ResumeWebSocket(self.shard_id)
self.sequence = None
self.session_id = None
log.info('Shard ID %s has either failed a RESUME request or needed to invalidate its session.' % self.shard_id)
yield from self.identify()
return
if op != self.DISPATCH:
log.info('Unhandled op {}'.format(op))
return
event = msg.get('t')
is_ready = event == 'READY'
if is_ready:
self.sequence = msg['s']
self.session_id = data['session_id']
parser = 'parse_' + event.lower()
try:
func = getattr(self._connection, parser)
except AttributeError:
log.info('Unhandled event {}'.format(event))
else:
func(data)
# remove the dispatched listeners
removed = []
for index, entry in enumerate(self._dispatch_listeners):
if entry.event != event:
continue
future = entry.future
if future.cancelled():
removed.append(index)
continue
try:
valid = entry.predicate(data)
except Exception as e:
future.set_exception(e)
removed.append(index)
else:
if valid:
ret = data if entry.result is None else entry.result(data)
future.set_result(ret)
removed.append(index)
for index in reversed(removed):
del self._dispatch_listeners[index]
def _can_handle_close(self, code):
return code not in (1000, 4004)
@asyncio.coroutine
def poll_event(self):
"""Polls for a DISPATCH event and handles the general gateway loop.
Raises
------
ConnectionClosed
The websocket connection was terminated for unhandled reasons.
"""
try:
msg = yield from self.recv()
yield from self.received_message(msg)
except websockets.exceptions.ConnectionClosed as e:
if self._can_handle_close(e.code):
log.info('Websocket closed with {0.code} ({0.reason}), attempting a reconnect.'.format(e))
raise ResumeWebSocket(self.shard_id) from e
else:
raise ConnectionClosed(e, shard_id=self.shard_id) from e
@asyncio.coroutine
def send(self, data):
self._dispatch('socket_raw_send', data)
yield from super().send(data)
@asyncio.coroutine
def send_as_json(self, data):
try:
yield from super().send(utils.to_json(data))
except websockets.exceptions.ConnectionClosed as e:
if not self._can_handle_close(e.code):
raise ConnectionClosed(e, shard_id=self.shard_id) from e
@asyncio.coroutine
def change_presence(self, *, game=None, status=None, afk=False, since=0.0):
if game is not None and not isinstance(game, Game):
raise InvalidArgument('game must be of type Game or None')
if status == 'idle':
since = int(time.time() * 1000)
sent_game = dict(game) if game else None
payload = {
'op': self.PRESENCE,
'd': {
'game': sent_game,
'afk': afk,
'since': since,
'status': status
}
}
sent = utils.to_json(payload)
log.debug('Sending "{}" to change status'.format(sent))
yield from self.send(sent)
@asyncio.coroutine
def request_sync(self, guild_ids):
payload = {
'op': self.GUILD_SYNC,
'd': list(guild_ids)
}
yield from self.send_as_json(payload)
@asyncio.coroutine
def voice_state(self, guild_id, channel_id, self_mute=False, self_deaf=False):
payload = {
'op': self.VOICE_STATE,
'd': {
'guild_id': guild_id,
'channel_id': channel_id,
'self_mute': self_mute,
'self_deaf': self_deaf
}
}
yield from self.send_as_json(payload)
# we're leaving a voice channel so remove it from the client list
if channel_id is None:
self._connection._remove_voice_client(guild_id)
@asyncio.coroutine
def close_connection(self, force=False):
if self._keep_alive:
self._keep_alive.stop()
yield from super().close_connection(force=force)
class DiscordVoiceWebSocket(websockets.client.WebSocketClientProtocol):
"""Implements the websocket protocol for handling voice connections.
Attributes
-----------
IDENTIFY
Send only. Starts a new voice session.
SELECT_PROTOCOL
Send only. Tells discord what encryption mode and how to connect for voice.
READY
Receive only. Tells the websocket that the initial connection has completed.
HEARTBEAT
Send only. Keeps your websocket connection alive.
SESSION_DESCRIPTION
Receive only. Gives you the secret key required for voice.
SPEAKING
Send only. Notifies the client if you are currently speaking.
"""
IDENTIFY = 0
SELECT_PROTOCOL = 1
READY = 2
HEARTBEAT = 3
SESSION_DESCRIPTION = 4
SPEAKING = 5
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.max_size = None
self._keep_alive = None
@asyncio.coroutine
def send_as_json(self, data):
yield from self.send(utils.to_json(data))
@classmethod
@asyncio.coroutine
def from_client(cls, client):
"""Creates a voice websocket for the :class:`VoiceClient`."""
gateway = 'wss://' + client.endpoint
ws = yield from websockets.connect(gateway, loop=client.loop, klass=cls)
ws.gateway = gateway
ws._connection = client
identify = {
'op': cls.IDENTIFY,
'd': {
'guild_id': client.guild_id,
'user_id': client.user.id,
'session_id': client.session_id,
'token': client.token
}
}
yield from ws.send_as_json(identify)
return ws
@asyncio.coroutine
def select_protocol(self, ip, port):
payload = {
'op': self.SELECT_PROTOCOL,
'd': {
'protocol': 'udp',
'data': {
'address': ip,
'port': port,
'mode': 'xsalsa20_poly1305'
}
}
}
yield from self.send_as_json(payload)
log.debug('Selected protocol as {}'.format(payload))
@asyncio.coroutine
def speak(self, is_speaking=True):
payload = {
'op': self.SPEAKING,
'd': {
'speaking': is_speaking,
'delay': 0
}
}
yield from self.send_as_json(payload)
log.debug('Voice speaking now set to {}'.format(is_speaking))
@asyncio.coroutine
def received_message(self, msg):
log.debug('Voice websocket frame received: {}'.format(msg))
op = msg.get('op')
data = msg.get('d')
if op == self.READY:
interval = data['heartbeat_interval'] / 1000.0
self._keep_alive = VoiceKeepAliveHandler(ws=self, interval=interval)
self._keep_alive.start()
yield from self.initial_connection(data)
elif op == self.SESSION_DESCRIPTION:
yield from self.load_secret_key(data)
@asyncio.coroutine
def initial_connection(self, data):
state = self._connection
state.ssrc = data.get('ssrc')
state.voice_port = data.get('port')
packet = bytearray(70)
struct.pack_into('>I', packet, 0, state.ssrc)
state.socket.sendto(packet, (state.endpoint_ip, state.voice_port))
recv = yield from self.loop.sock_recv(state.socket, 70)
log.debug('received packet in initial_connection: {}'.format(recv))
# the ip is ascii starting at the 4th byte and ending at the first null
ip_start = 4
ip_end = recv.index(0, ip_start)
state.ip = recv[ip_start:ip_end].decode('ascii')
# the port is a little endian unsigned short in the last two bytes
# yes, this is different endianness from everything else
state.port = struct.unpack_from('<H', recv, len(recv) - 2)[0]
log.debug('detected ip: {0.ip} port: {0.port}'.format(state))
yield from self.select_protocol(state.ip, state.port)
log.info('selected the voice protocol for use')
@asyncio.coroutine
def load_secret_key(self, data):
log.info('received secret key for voice connection')
self._connection.secret_key = data.get('secret_key')
yield from self.speak()
@asyncio.coroutine
def poll_event(self):
try:
msg = yield from asyncio.wait_for(self.recv(), timeout=30.0, loop=self.loop)
yield from self.received_message(json.loads(msg))
except websockets.exceptions.ConnectionClosed as e:
raise ConnectionClosed(e, shard_id=None) from e
@asyncio.coroutine
def close_connection(self, force=False):
if self._keep_alive:
self._keep_alive.stop()
yield from super().close_connection(force=force)