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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Sun, 15 Oct 2017 00:29:07 +0100
Subject: [PATCH] revert serverside behavior of keepalives
This patch intends to bump up the time that a client has to reply to the
server back to 30 seconds as per pre 1.12.2, which allowed clients
more than enough time to reply potentially allowing them to be less
tempermental due to lag spikes on the network thread, e.g. that caused
by plugins that are interacting with netty.
We also add a system property to allow people to tweak how long the server
will wait for a reply. There is a compromise here between lower and higher
values, lower values will mean that dead connections can be closed sooner,
whereas higher values will make this less sensitive to issues such as spikes
from networking or during connections flood of chunk packets on slower clients,
at the cost of dead connections being kept open for longer.
diff --git a/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
index aa4d8ccb9cd5af57ffd3a2b4ce34d22f6f3d632c..4e450a3d7f2db7d7d346103cc9467654ca1b8a1f 100644
--- a/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
@@ -48,11 +48,12 @@ public abstract class ServerCommonPacketListenerImpl implements ServerCommonPack
private static final Component TIMEOUT_DISCONNECTION_MESSAGE = Component.translatable("disconnect.timeout");
protected final MinecraftServer server;
public final Connection connection; // Paper
- private long keepAliveTime;
+ private long keepAliveTime = Util.getMillis(); // Paper
private boolean keepAlivePending;
private long keepAliveChallenge;
private int latency;
private volatile boolean suspendFlushingOnServerThread = false;
+ private static final long KEEPALIVE_LIMIT = Long.getLong("paper.playerconnection.keepalive", 30) * 1000; // Paper - provide property to set keepalive limit
public ServerCommonPacketListenerImpl(MinecraftServer minecraftserver, Connection networkmanager, CommonListenerCookie commonlistenercookie, ServerPlayer player) { // CraftBukkit
this.server = minecraftserver;
@@ -170,18 +171,25 @@ public abstract class ServerCommonPacketListenerImpl implements ServerCommonPack
protected void keepConnectionAlive() {
this.server.getProfiler().push("keepAlive");
- long i = Util.getMillis();
-
- if (i - this.keepAliveTime >= 25000L) { // CraftBukkit
- if (this.keepAlivePending) {
+ // 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
+ long currentTime = Util.getMillis();
+ long elapsedTime = currentTime - this.keepAliveTime;
+
+ if (this.keepAlivePending) {
+ if (!this.processedDisconnect && elapsedTime >= KEEPALIVE_LIMIT) { // check keepalive limit, don't fire if already disconnected
+ ServerGamePacketListenerImpl.LOGGER.warn("{} was kicked due to keepalive timeout!", this.player.getScoreboardName()); // more info
this.disconnect(ServerCommonPacketListenerImpl.TIMEOUT_DISCONNECTION_MESSAGE);
- } else {
+ }
+ } else {
+ if (elapsedTime >= 15000L) { // 15 seconds
this.keepAlivePending = true;
- this.keepAliveTime = i;
- this.keepAliveChallenge = i;
+ this.keepAliveTime = currentTime;
+ this.keepAliveChallenge = currentTime;
this.send(new ClientboundKeepAlivePacket(this.keepAliveChallenge));
}
}
+ // Paper end
this.server.getProfiler().pop();
}
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