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f37381ea8a
Removes synchronization from sending packets
Makes normal packet sends no longer need to be wrapped and queued like it use to work.
Adds more packet queue immunities on top of keep alive to let the following scenarios go out
without delay:
- Keep Alive
- Chat
- Kick
- All of the packets during the Player Joined World event
Hoping that latter one helps join timeout issues more too for slow connections.
Removes processing packet queue off of main thread
- for the few cases where it is allowed, order is not necessary nor
should it even be happening concurrently in first place (handshaking/login/status)
Ensures packets sent asynchronously are dispatched on main thread
This helps ensure safety for ProtocolLib as packet listeners
are commonly accessing world state. This will allow you to schedule
a packet to be sent async, but itll be dispatched sync for packet
listeners to process.
This should solve some deadlock risks
This may provide a decent performance improvement because thread synchronization incurs a cache reset
so by avoiding ever entering a synchronized block, we get to avoid that, and packet sending is a really
hot activity.
52 lines
2.8 KiB
Diff
52 lines
2.8 KiB
Diff
From 3bf2d6906af2ae65a709444f3d72597ead34cac1 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Thu, 2 Apr 2020 01:42:39 -0400
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Subject: [PATCH] Prevent Double PlayerChunkMap adds crashing server
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Suspected case would be around the technique used in .stopRiding
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Stack will identify any causer of this and warn instead of crashing.
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diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
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index 6eb05591317..4beae504c87 100644
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--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
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+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
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@@ -1446,6 +1446,14 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
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protected void addEntity(Entity entity) {
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org.spigotmc.AsyncCatcher.catchOp("entity track"); // Spigot
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+ // Paper start - ignore and warn about illegal addEntity calls instead of crashing server
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+ if (!entity.valid || entity.world != this.world || this.trackedEntities.containsKey(entity.getId())) {
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+ new Throwable("[ERROR] Illegal PlayerChunkMap::addEntity for world " + this.world.getWorld().getName()
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+ + ": " + entity + (this.trackedEntities.containsKey(entity.getId()) ? " ALREADY CONTAINED (This would have crashed your server)" : ""))
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+ .printStackTrace();
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+ return;
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+ }
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+ // Paper end
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if (!(entity instanceof EntityComplexPart)) {
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if (!(entity instanceof EntityLightning)) {
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EntityTypes<?> entitytypes = entity.getEntityType();
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diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
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index 9fbe8fa1b2b..2a7a47c6707 100644
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--- a/src/main/java/net/minecraft/server/WorldServer.java
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+++ b/src/main/java/net/minecraft/server/WorldServer.java
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@@ -1472,7 +1472,7 @@ public class WorldServer extends World {
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}
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}
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- this.getChunkProvider().addEntity(entity);
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+ // this.getChunkProvider().addEntity(entity); // Paper - moved down below valid=true
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// CraftBukkit start - SPIGOT-5278
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if (entity instanceof EntityDrowned) {
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this.navigators.add(((EntityDrowned) entity).navigationWater);
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@@ -1483,6 +1483,7 @@ public class WorldServer extends World {
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this.navigators.add(((EntityInsentient) entity).getNavigation());
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}
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entity.valid = true; // CraftBukkit
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+ this.getChunkProvider().addEntity(entity); // Paper - from above to be below valid=true
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// Paper start - Set origin location when the entity is being added to the world
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if (entity.origin == null) {
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entity.origin = entity.getBukkitEntity().getLocation();
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--
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2.26.2
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