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LavalinkLoadBalancer.java
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LavalinkLoadBalancer.java
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/*
* Copyright (c) Freya Arbjerg. Licensed under the MIT license
*/
package lavalink.client.io;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
@SuppressWarnings("WeakerAccess")
public class LavalinkLoadBalancer {
private Lavalink lavalink;
//private Map<String, Optional<LavalinkSocket>> socketMap = new ConcurrentHashMap<>();
private List<PenaltyProvider> penaltyProviders = new ArrayList<>();
LavalinkLoadBalancer(Lavalink lavalink) {
this.lavalink = lavalink;
}
@NonNull
public LavalinkSocket determineBestSocket(long guild) {
LavalinkSocket leastPenalty = null;
int record = Integer.MAX_VALUE;
@SuppressWarnings("unchecked")
List<LavalinkSocket> nodes = lavalink.getNodes();
for (LavalinkSocket socket : nodes) {
int total = getPenalties(socket, guild, penaltyProviders).getTotal();
if (total < record) {
leastPenalty = socket;
record = total;
}
}
if (leastPenalty == null || !leastPenalty.isAvailable())
throw new IllegalStateException("No available nodes!");
return leastPenalty;
}
@SuppressWarnings("unused")
public void addPenalty(PenaltyProvider penalty) {
this.penaltyProviders.add(penalty);
}
@SuppressWarnings("unused")
public void removePenalty(PenaltyProvider penalty) {
this.penaltyProviders.remove(penalty);
}
void onNodeDisconnect(LavalinkSocket disconnected) {
//noinspection unchecked
Collection<Link> links = lavalink.getLinks();
links.forEach(link -> {
if (disconnected.equals(link.getNode(false)))
link.changeNode(lavalink.loadBalancer.determineBestSocket(link.getGuildIdLong()));
});
}
void onNodeConnect(LavalinkSocket connected) {
@SuppressWarnings("unchecked")
List<LavalinkSocket> sockets = lavalink.getNodes();
long otherAvailableNodes = sockets.stream()
.filter(node -> node != connected)
.filter(LavalinkSocket::isAvailable)
.count();
if (otherAvailableNodes > 0) { //only update links if this is the only connected node
return;
}
@SuppressWarnings("unchecked")
Collection<Link> links = lavalink.getLinks();
links.forEach(link -> {
if (link.getNode(false) == null)
link.changeNode(connected);
});
}
public Penalties getPenalties(LavalinkSocket socket, long guild, List<PenaltyProvider> penaltyProviders) {
return new Penalties(socket, guild, penaltyProviders, lavalink);
}
@SuppressWarnings("unused")
public static Penalties getPenalties(LavalinkSocket socket) {
return new Penalties(socket, 0L, Collections.emptyList(), null);
}
@SuppressWarnings("unused")
public static class Penalties {
private LavalinkSocket socket;
private final long guild;
private int playerPenalty = 0;
private int cpuPenalty = 0;
private int deficitFramePenalty = 0;
private int nullFramePenalty = 0;
private int customPenalties = 0;
private final Lavalink lavalink;
private Penalties(LavalinkSocket socket, long guild, List<PenaltyProvider> penaltyProviders, Lavalink lavalink) {
this.lavalink = lavalink;
this.socket = socket;
this.guild = guild;
RemoteStats stats = socket.getStats();
if (stats == null) return; // Will return as max penalty anyways
// This will serve as a rule of thumb. 1 playing player = 1 penalty point
if (lavalink != null) {
playerPenalty = countPlayingPlayers();
} else {
playerPenalty = stats.getPlayingPlayers();
}
// https://fred.moe/293.png
cpuPenalty = (int) Math.pow(1.05d, 100 * stats.getSystemLoad()) * 10 - 10;
// -1 Means we don't have any frame stats. This is normal for very young nodes
if (stats.getAvgFramesDeficitPerMinute() != -1) {
// https://fred.moe/rjD.png
deficitFramePenalty = (int) (Math.pow(1.03d, 500f * ((float) stats.getAvgFramesDeficitPerMinute() / 3000f)) * 600 - 600);
nullFramePenalty = (int) (Math.pow(1.03d, 500f * ((float) stats.getAvgFramesNulledPerMinute() / 3000f)) * 300 - 300);
nullFramePenalty *= 2;
// Deficit frames are better than null frames, as deficit frames can be caused by the garbage collector
}
penaltyProviders.forEach(pp -> customPenalties += pp.getPenalty(this));
}
private int countPlayingPlayers() {
//noinspection unchecked
Collection<Link> links = lavalink.getLinks();
Long players = links
.stream().filter(link ->
socket.equals(link.getNode(false)) &&
link.getPlayer().getPlayingTrack() != null &&
!link.getPlayer().isPaused())
.count();
return players.intValue();
}
public LavalinkSocket getSocket() {
return socket;
}
public long getGuild() {
return guild;
}
public int getPlayerPenalty() {
return playerPenalty;
}
public int getCpuPenalty() {
return cpuPenalty;
}
public int getDeficitFramePenalty() {
return deficitFramePenalty;
}
public int getNullFramePenalty() {
return nullFramePenalty;
}
public int getCustomPenalties() {
return this.customPenalties;
}
public int getTotal() {
if (!socket.isAvailable() || socket.getStats() == null) return (Integer.MAX_VALUE - 1);
return playerPenalty + cpuPenalty + deficitFramePenalty + nullFramePenalty + customPenalties;
}
@Override
public String toString() {
if (!socket.isAvailable()) return "Penalties{" +
"unavailable=" + (Integer.MAX_VALUE - 1) +
'}';
return "Penalties{" +
"total=" + getTotal() +
", playerPenalty=" + playerPenalty +
", cpuPenalty=" + cpuPenalty +
", deficitFramePenalty=" + deficitFramePenalty +
", nullFramePenalty=" + nullFramePenalty +
", custom=" + customPenalties +
'}';
}
}
}