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Alternative Keepalive Handling

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This commit is contained in:
William Blake Galbreath
2025-01-05 12:26:40 -08:00
committed by granny
parent 32db32c5ae
commit 4c9961c7d1
3 changed files with 53 additions and 73 deletions
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48
purpur-server/minecraft-patches/sources/net/minecraft/server/network/ServerCommonPacketListenerImpl.java.patch
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@@ -1,5 +1,13 @@
--- a/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
+++ b/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
@@ -41,6 +_,7 @@
private long keepAliveChallenge;
private long closedListenerTime;
private boolean closed = false;
+ private it.unimi.dsi.fastutil.longs.LongList keepAlives = new it.unimi.dsi.fastutil.longs.LongArrayList(); // Purpur - Alternative Keepalive Handling
private int latency;
private volatile boolean suspendFlushingOnServerThread = false;
// CraftBukkit start
@@ -51,6 +_,7 @@
public final java.util.Map<java.util.UUID, net.kyori.adventure.resource.ResourcePackCallback> packCallbacks = new java.util.concurrent.ConcurrentHashMap<>(); // Paper - adventure resource pack callbacks
private static final long KEEPALIVE_LIMIT = Long.getLong("paper.playerconnection.keepalive", 30) * 1000; // Paper - provide property to set keepalive limit
@@ -8,6 +16,23 @@
public ServerCommonPacketListenerImpl(MinecraftServer server, Connection connection, CommonListenerCookie cookie, net.minecraft.server.level.ServerPlayer player) { // CraftBukkit
this.server = server;
@@ -118,6 +_,16 @@
@Override
public void handleKeepAlive(ServerboundKeepAlivePacket packet) {
+ // Purpur start - Alternative Keepalive Handling
+ if (org.purpurmc.purpur.PurpurConfig.useAlternateKeepAlive) {
+ if (this.keepAlivePending && !keepAlives.isEmpty() && keepAlives.contains(packet.getId())) {
+ int ping = (int) (Util.getMillis() - packet.getId());
+ this.latency = (this.latency * 3 + ping) / 4;
+ this.keepAlivePending = false;
+ keepAlives.clear(); // we got a valid response, lets roll with it and forget the rest
+ }
+ } else
+ // Purpur end - Alternative Keepalive Handling
if (this.keepAlivePending && packet.getId() == this.keepAliveChallenge) {
int i = (int)(Util.getMillis() - this.keepAliveTime);
this.latency = (this.latency * 3 + i) / 4;
@@ -159,6 +_,13 @@
ServerGamePacketListenerImpl.LOGGER.error("Couldn't register custom payload", ex);
this.disconnect(Component.literal("Invalid payload REGISTER!"), org.bukkit.event.player.PlayerKickEvent.Cause.INVALID_PAYLOAD); // Paper - kick event cause
@@ -22,3 +47,26 @@
} else if (identifier.equals(ServerCommonPacketListenerImpl.CUSTOM_UNREGISTER)) {
try {
String channels = payload.toString(com.google.common.base.Charsets.UTF_8);
@@ -238,6 +_,22 @@
// Paper start - give clients a longer time to respond to pings as per pre 1.12.2 timings
// This should effectively place the keepalive handling back to "as it was" before 1.12.2
final long elapsedTime = millis - this.keepAliveTime;
+
+ // Purpur start - Alternative Keepalive Handling
+ if (org.purpurmc.purpur.PurpurConfig.useAlternateKeepAlive) {
+ if (elapsedTime >= 1000L) { // 1 second
+ if (this.keepAlivePending && !this.processedDisconnect && keepAlives.size() * 1000L >= KEEPALIVE_LIMIT) {
+ this.disconnect(ServerCommonPacketListenerImpl.TIMEOUT_DISCONNECTION_MESSAGE, org.bukkit.event.player.PlayerKickEvent.Cause.TIMEOUT);
+ } else if (this.checkIfClosed(millis)) {
+ this.keepAlivePending = true;
+ this.keepAliveTime = millis; // hijack this field for 1 second intervals
+ this.keepAlives.add(millis); // currentTime is ID
+ this.send(new ClientboundKeepAlivePacket(millis));
+ }
+ }
+ } else
+ // Purpur end - Alternative Keepalive Handling
+
if (!this.isSingleplayerOwner() && elapsedTime >= 15000L) { // use vanilla's 15000L between keep alive packets
if (this.keepAlivePending && !this.processedDisconnect && elapsedTime >= KEEPALIVE_LIMIT) { // check keepalive limit, don't fire if already disconnected
// Paper end - give clients a longer time to respond to pings as per pre 1.12.2 timings

5
purpur-server/src/main/java/org/purpurmc/purpur/PurpurConfig.java
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@@ -182,6 +182,11 @@ public class PurpurConfig {
laggingThreshold = getDouble("settings.lagging-threshold", laggingThreshold);
}
public static boolean useAlternateKeepAlive = false;
private static void useAlternateKeepAlive() {
useAlternateKeepAlive = getBoolean("settings.use-alternate-keepalive", useAlternateKeepAlive);
}
public static int barrelRows = 3;
public static boolean enderChestSixRows = false;
public static boolean enderChestPermissionRows = false;