More voice fixes

* More voice fixes

* Start socket reader paused and wait for socket creation

* Fix issues handling 4014 closures

Fixes code not handling disconnects from discord's end properly.  The
4014 code is shared between being disconnected and moved, so it has to
account for the uncertainty.  Also properly stops the voice_client audio
player when disconnecting.

* Fix sending (dropped) silence packets when not connected

discord/player.py

@@ -763,7 +763,8 @@ class AudioPlayer(threading.Thread):
             delay = max(0, self.DELAY + (next_time - time.perf_counter()))
             time.sleep(delay)
 
-        self.send_silence()
+        if client.is_connected():
+            self.send_silence()
 
     def run(self) -> None:
         try:

discord/voice_client.py

@@ -337,7 +337,7 @@ class VoiceClient(VoiceProtocol):
         Disconnects this voice client from voice.
         """
         self.stop()
-        await self._connection.disconnect(force=force)
+        await self._connection.disconnect(force=force, wait=True)
         self.cleanup()
 
     async def move_to(self, channel: Optional[abc.Snowflake], *, timeout: Optional[float] = 30.0) -> None:
@@ -567,6 +567,6 @@ class VoiceClient(VoiceProtocol):
         try:
             self._connection.send_packet(packet)
         except OSError:
-            _log.info('A packet has been dropped (seq: %s, timestamp: %s)', self.sequence, self.timestamp)
+            _log.debug('A packet has been dropped (seq: %s, timestamp: %s)', self.sequence, self.timestamp)
 
         self.checked_add('timestamp', opus.Encoder.SAMPLES_PER_FRAME, 4294967295)

discord/voice_state.py

@@ -81,9 +81,10 @@ _log = logging.getLogger(__name__)
 
 
 class SocketReader(threading.Thread):
-    def __init__(self, state: VoiceConnectionState) -> None:
+    def __init__(self, state: VoiceConnectionState, *, start_paused: bool = True) -> None:
         super().__init__(daemon=True, name=f'voice-socket-reader:{id(self):#x}')
         self.state: VoiceConnectionState = state
+        self.start_paused = start_paused
         self._callbacks: List[SocketReaderCallback] = []
         self._running = threading.Event()
         self._end = threading.Event()
@@ -130,6 +131,8 @@ class SocketReader(threading.Thread):
     def run(self) -> None:
         self._end.clear()
         self._running.set()
+        if self.start_paused:
+            self.pause()
         try:
             self._do_run()
         except Exception:
@@ -148,7 +151,10 @@ class SocketReader(threading.Thread):
             # Since this socket is a non blocking socket, select has to be used to wait on it for reading.
             try:
                 readable, _, _ = select.select([self.state.socket], [], [], 30)
-            except (ValueError, TypeError):
+            except (ValueError, TypeError, OSError) as e:
+                _log.debug(
+                    "Select error handling socket in reader, this should be safe to ignore: %s: %s", e.__class__.__name__, e
+                )
                 # The socket is either closed or doesn't exist at the moment
                 continue
 
@@ -305,6 +311,10 @@ class VoiceConnectionState:
                 _log.debug('Ignoring unexpected voice_state_update event')
 
     async def voice_server_update(self, data: VoiceServerUpdatePayload) -> None:
+        previous_token = self.token
+        previous_server_id = self.server_id
+        previous_endpoint = self.endpoint
+
         self.token = data['token']
         self.server_id = int(data['guild_id'])
         endpoint = data.get('endpoint')
@@ -338,6 +348,10 @@ class VoiceConnectionState:
             self.state = ConnectionFlowState.got_voice_server_update
 
         elif self.state is not ConnectionFlowState.disconnected:
+            # eventual consistency
+            if previous_token == self.token and previous_server_id == self.server_id and previous_token == self.token:
+                return
+
             _log.debug('Unexpected server update event, attempting to handle')
 
             await self.soft_disconnect(with_state=ConnectionFlowState.got_voice_server_update)
@@ -422,7 +436,7 @@ class VoiceConnectionState:
         if not self._runner:
             self._runner = self.voice_client.loop.create_task(self._poll_voice_ws(reconnect), name='Voice websocket poller')
 
-    async def disconnect(self, *, force: bool = True, cleanup: bool = True) -> None:
+    async def disconnect(self, *, force: bool = True, cleanup: bool = True, wait: bool = False) -> None:
         if not force and not self.is_connected():
             return
 
@@ -433,23 +447,26 @@ class VoiceConnectionState:
         except Exception:
             _log.debug('Ignoring exception disconnecting from voice', exc_info=True)
         finally:
-            self.ip = MISSING
-            self.port = MISSING
             self.state = ConnectionFlowState.disconnected
             self._socket_reader.pause()
 
+            # Stop threads before we unlock waiters so they end properly
+            if cleanup:
+                self._socket_reader.stop()
+                self.voice_client.stop()
+
             # Flip the connected event to unlock any waiters
             self._connected.set()
             self._connected.clear()
 
-            if cleanup:
-                self._socket_reader.stop()
-
             if self.socket:
                 self.socket.close()
 
+            self.ip = MISSING
+            self.port = MISSING
+
             # Skip this part if disconnect was called from the poll loop task
-            if self._runner and asyncio.current_task() != self._runner:
+            if wait and not self._inside_runner():
                 # Wait for the voice_state_update event confirming the bot left the voice channel.
                 # This prevents a race condition caused by disconnecting and immediately connecting again.
                 # The new VoiceConnectionState object receives the voice_state_update event containing channel=None while still
@@ -458,7 +475,9 @@ class VoiceConnectionState:
                     async with atimeout(self.timeout):
                         await self._disconnected.wait()
                 except TimeoutError:
-                    _log.debug('Timed out waiting for disconnect confirmation event')
+                    _log.debug('Timed out waiting for voice disconnection confirmation')
+                except asyncio.CancelledError:
+                    pass
 
             if cleanup:
                 self.voice_client.cleanup()
@@ -476,23 +495,26 @@ class VoiceConnectionState:
         except Exception:
             _log.debug('Ignoring exception soft disconnecting from voice', exc_info=True)
         finally:
-            self.ip = MISSING
-            self.port = MISSING
             self.state = with_state
             self._socket_reader.pause()
 
             if self.socket:
                 self.socket.close()
 
+            self.ip = MISSING
+            self.port = MISSING
+
     async def move_to(self, channel: Optional[abc.Snowflake], timeout: Optional[float]) -> None:
         if channel is None:
-            await self.disconnect()
+            # This function should only be called externally so its ok to wait for the disconnect.
+            await self.disconnect(wait=True)
             return
 
         if self.voice_client.channel and channel.id == self.voice_client.channel.id:
             return
 
         previous_state = self.state
+
         # this is only an outgoing ws request
         # if it fails, nothing happens and nothing changes (besides self.state)
         await self._move_to(channel)
@@ -504,7 +526,6 @@ class VoiceConnectionState:
             _log.warning('Timed out trying to move to channel %s in guild %s', channel.id, self.guild.id)
             if self.state is last_state:
                 _log.debug('Reverting to previous state %s', previous_state.name)
-
                 self.state = previous_state
 
     def wait(self, timeout: Optional[float] = None) -> bool:
@@ -527,6 +548,9 @@ class VoiceConnectionState:
         _log.debug('Unregistering socket listener callback %s', callback)
         self._socket_reader.unregister(callback)
 
+    def _inside_runner(self) -> bool:
+        return self._runner is not None and asyncio.current_task() == self._runner
+
     async def _wait_for_state(
         self, state: ConnectionFlowState, *other_states: ConnectionFlowState, timeout: Optional[float] = None
     ) -> None:
@@ -590,11 +614,21 @@ class VoiceConnectionState:
                         break
 
                     if exc.code == 4014:
+                        # We were disconnected by discord
+                        # This condition is a race between the main ws event and the voice ws closing
+                        if self._disconnected.is_set():
+                            _log.info('Disconnected from voice by discord, close code %d.', exc.code)
+                            await self.disconnect()
+                            break
+
+                        # We may have been moved to a different channel
                         _log.info('Disconnected from voice by force... potentially reconnecting.')
                         successful = await self._potential_reconnect()
                         if not successful:
                             _log.info('Reconnect was unsuccessful, disconnecting from voice normally...')
-                            await self.disconnect()
+                            # Don't bother to disconnect if already disconnected
+                            if self.state is not ConnectionFlowState.disconnected:
+                                await self.disconnect()
                             break
                         else:
                             continue
@@ -626,10 +660,16 @@ class VoiceConnectionState:
     async def _potential_reconnect(self) -> bool:
         try:
             await self._wait_for_state(
-                ConnectionFlowState.got_voice_server_update, ConnectionFlowState.got_both_voice_updates, timeout=self.timeout
+                ConnectionFlowState.got_voice_server_update,
+                ConnectionFlowState.got_both_voice_updates,
+                ConnectionFlowState.disconnected,
+                timeout=self.timeout,
             )
         except asyncio.TimeoutError:
             return False
+        else:
+            if self.state is ConnectionFlowState.disconnected:
+                return False
 
         previous_ws = self.ws
         try: