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Java wrapper for the popular chat & VOIP service: Discord https://discord.com
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/*
* Copyright 2015 Austin Keener, Michael Ritter, Florian Spieß, and the JDA contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.dv8tion.jda.internal.requests;
import gnu.trove.map.TLongObjectMap;
import net.dv8tion.jda.api.JDA;
import net.dv8tion.jda.api.entities.Guild;
import net.dv8tion.jda.api.entities.GuildVoiceState;
import net.dv8tion.jda.api.managers.AudioManager;
import net.dv8tion.jda.api.utils.data.DataObject;
import net.dv8tion.jda.internal.JDAImpl;
import net.dv8tion.jda.internal.audio.ConnectionRequest;
import net.dv8tion.jda.internal.audio.ConnectionStage;
import org.slf4j.Logger;
import java.util.Queue;
import java.util.concurrent.Future;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
//Helper class delegated to WebSocketClient
class WebSocketSendingThread implements Runnable
{
private static final Logger LOG = WebSocketClient.LOG;
private final WebSocketClient client;
private final JDAImpl api;
private final ReentrantLock queueLock;
private final Queue chunkQueue;
private final Queue ratelimitQueue;
private final TLongObjectMap queuedAudioConnections;
private final ScheduledExecutorService executor;
private Future handle;
private boolean needRateLimit = false;
private boolean attemptedToSend = false;
private boolean shutdown = false;
WebSocketSendingThread(WebSocketClient client)
{
this.client = client;
this.api = client.api;
this.queueLock = client.queueLock;
this.chunkQueue = client.chunkSyncQueue;
this.ratelimitQueue = client.ratelimitQueue;
this.queuedAudioConnections = client.queuedAudioConnections;
this.executor = client.executor;
}
public void shutdown()
{
shutdown = true;
if (handle != null)
handle.cancel(false);
}
public void start()
{
shutdown = false;
handle = executor.submit(this);
}
private void scheduleIdle()
{
if (shutdown)
return;
handle = executor.schedule(this, 500, TimeUnit.MILLISECONDS);
}
private void scheduleSentMessage()
{
if (shutdown)
return;
handle = executor.schedule(this, 10, TimeUnit.MILLISECONDS);
}
private void scheduleRateLimit()
{
if (shutdown)
return;
handle = executor.schedule(this, 1, TimeUnit.MINUTES);
}
@Override
public void run()
{
//Make sure that we don't send any packets before sending auth info.
if (!client.sentAuthInfo)
{
scheduleIdle();
return;
}
ConnectionRequest audioRequest = null;
DataObject chunkRequest = null;
boolean hasLock = false;
try
{
api.setContext();
attemptedToSend = false;
needRateLimit = false;
// We do this outside of the lock because otherwise we could potentially deadlock here
audioRequest = client.getNextAudioConnectRequest();
hasLock = queueLock.tryLock() || queueLock.tryLock(10, TimeUnit.SECONDS);
if (!hasLock)
{
scheduleNext();
return;
}
chunkRequest = chunkQueue.peek();
if (chunkRequest != null)
handleChunkSync(chunkRequest);
else if (audioRequest != null)
handleAudioRequest(audioRequest);
else
handleNormalRequest();
}
catch (InterruptedException ignored)
{
LOG.debug("Main WS send thread interrupted. Most likely JDA is disconnecting the websocket.");
return;
}
catch (Throwable ex)
{
// Log error
LOG.error("Encountered error in gateway worker", ex);
if (!attemptedToSend)
{
// Try to remove the failed request
if (chunkRequest != null)
client.chunkSyncQueue.remove(chunkRequest);
else if (audioRequest != null)
client.removeAudioConnection(audioRequest.getGuildIdLong());
}
// Rethrow if error to kill thread
if (ex instanceof Error)
throw (Error) ex;
}
finally
{
if (hasLock)
queueLock.unlock();
}
scheduleNext();
}
private void scheduleNext()
{
try
{
if (needRateLimit)
scheduleRateLimit();
else if (!attemptedToSend)
scheduleIdle();
else
scheduleSentMessage();
}
catch (RejectedExecutionException ex)
{
if (api.getStatus() == JDA.Status.SHUTTING_DOWN || api.getStatus() == JDA.Status.SHUTDOWN)
LOG.debug("Rejected task after shutdown", ex);
else
LOG.error("Was unable to schedule next packet due to rejected execution by threadpool", ex);
}
}
private void handleChunkSync(DataObject chunkOrSyncRequest)
{
LOG.debug("Sending chunk/sync request {}", chunkOrSyncRequest);
boolean success = send(
DataObject.empty()
.put("op", WebSocketCode.MEMBER_CHUNK_REQUEST)
.put("d", chunkOrSyncRequest)
);
if (success)
chunkQueue.remove();
}
private void handleAudioRequest(ConnectionRequest audioRequest)
{
long channelId = audioRequest.getChannelId();
long guildId = audioRequest.getGuildIdLong();
Guild guild = api.getGuildById(guildId);
if (guild == null)
{
LOG.debug("Discarding voice request due to null guild {}", guildId);
// race condition on guild delete, avoid NPE on DISCONNECT requests
queuedAudioConnections.remove(guildId);
return;
}
ConnectionStage stage = audioRequest.getStage();
AudioManager audioManager = guild.getAudioManager();
DataObject packet;
switch (stage)
{
case RECONNECT:
case DISCONNECT:
packet = newVoiceClose(guildId);
break;
default:
case CONNECT:
packet = newVoiceOpen(audioManager, channelId, guild.getIdLong());
}
LOG.debug("Sending voice request {}", packet);
if (send(packet))
{
//If we didn't get RateLimited, Next request attempt will be 10 seconds from now
// we remove it in VoiceStateUpdateHandler once we hear that it has updated our status
// in 10 seconds we will attempt again in case we did not receive an update
audioRequest.setNextAttemptEpoch(System.currentTimeMillis() + 10000);
//If we are already in the correct state according to voice state
// we will not receive a VOICE_STATE_UPDATE that would remove it
// thus we update it here
final GuildVoiceState voiceState = guild.getSelfMember().getVoiceState();
client.updateAudioConnection0(guild.getIdLong(), voiceState.getChannel());
}
}
private void handleNormalRequest()
{
DataObject message = ratelimitQueue.peek();
if (message != null)
{
LOG.debug("Sending normal message {}", message);
if (send(message))
ratelimitQueue.remove();
}
}
//returns true if send was successful
private boolean send(DataObject request)
{
needRateLimit = !client.send(request, false);
attemptedToSend = true;
return !needRateLimit;
}
protected DataObject newVoiceClose(long guildId)
{
return DataObject.empty()
.put("op", WebSocketCode.VOICE_STATE)
.put("d", DataObject.empty()
.put("guild_id", Long.toUnsignedString(guildId))
.putNull("channel_id")
.put("self_mute", false)
.put("self_deaf", false));
}
protected DataObject newVoiceOpen(AudioManager manager, long channel, long guild)
{
return DataObject.empty()
.put("op", WebSocketCode.VOICE_STATE)
.put("d", DataObject.empty()
.put("guild_id", guild)
.put("channel_id", channel)
.put("self_mute", manager.isSelfMuted())
.put("self_deaf", manager.isSelfDeafened()));
}
}