From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Shane Freeder 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 6fd8204a8d66d26c3011d197c004398d320dc469..b36528ad18c8603994c6a821b19b99581717b44c 100644 --- a/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java +++ b/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java @@ -75,7 +75,7 @@ public abstract class ServerCommonPacketListenerImpl implements ServerCommonPack protected final MinecraftServer server; public final Connection connection; // Paper private final boolean transferred; - private long keepAliveTime; + private long keepAliveTime = Util.getMillis(); // Paper private boolean keepAlivePending; private long keepAliveChallenge; private long closedListenerTime; @@ -83,6 +83,7 @@ public abstract class ServerCommonPacketListenerImpl implements ServerCommonPack private int latency; private volatile boolean suspendFlushingOnServerThread = false; public final java.util.Map 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 public ServerCommonPacketListenerImpl(MinecraftServer minecraftserver, Connection networkmanager, CommonListenerCookie commonlistenercookie, ServerPlayer player) { // CraftBukkit this.server = minecraftserver; @@ -239,18 +240,22 @@ public abstract class ServerCommonPacketListenerImpl implements ServerCommonPack protected void keepConnectionAlive() { Profiler.get().push("keepAlive"); - long i = Util.getMillis(); + // 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.isSingleplayerOwner() && i - this.keepAliveTime >= 25000L) { // CraftBukkit - if (this.keepAlivePending) { + if (!this.isSingleplayerOwner() && elapsedTime >= 15000L) { // Paper - use vanilla's 15000L between keep alive packets + if (this.keepAlivePending && !this.processedDisconnect && elapsedTime >= KEEPALIVE_LIMIT) { // Paper - check keepalive limit, don't fire if already disconnected this.disconnect(ServerCommonPacketListenerImpl.TIMEOUT_DISCONNECTION_MESSAGE); - } else if (this.checkIfClosed(i)) { + } else if (this.checkIfClosed(currentTime)) { // Paper this.keepAlivePending = true; - this.keepAliveTime = i; - this.keepAliveChallenge = i; + this.keepAliveTime = currentTime; + this.keepAliveChallenge = currentTime; this.send(new ClientboundKeepAlivePacket(this.keepAliveChallenge)); } } + // Paper end - give clients a longer time to respond to pings as per pre 1.12.2 timings Profiler.get().pop(); }