PaperMC/Spigot-Server-Patches/0485-Fix-Longstanding-Broken-behavior-of-PlayerJoinEvent.patch
Aikar fcf89e852e
Improve mid tick chunk loading, Fix Oversleep, other improvements
Process loads outside of any canSleep check. Original intent was to
only apply those restrictions to generations but realized I had some
checks higher up the call chain.

Reworked the back off strategy to just run every 1 millisecond per world,
and to apply the per tick limit to generations only.

This guarantees that your chunk will load with at most around 1ms delay.

Additionally, fire midTick processing in a few more places, notably the
oversleep section so we can keep processing loads here too which has
a large up to 50ms window...

Speaking of oversleep, we had a bug in our implementation changes for
Timings that caused oversleep to not sleep the correct amount.

Because we now moved it into the NEXT tick instead of THIS tick, the
value of nextTick had already been increased to +50ms, resulting in
the risk of sleeping more than it should, but, more importantly, this
caused every task that was trying to NOT run during oversleep to actually
run during oversleep.

This is now fixed.

Another small tweak is to the /tps command, to no longer show the star when
TPS is right at 20.

Due to ineffeciencies in the sleep precision, TPS is commonly 20.02.
This causes the star to show up almost constantly, so now only show it if
we actually hit a real "catchup".

This commit also improves the changes to the CallbackExecutor, in that
it now is also recursion safe.

It was possible that the executor could run tasks out of desired order
if the executor task scheduled more executor tasks.

We solve this by ensuring new additions do not enter the currently iterated queue.

Each depth level will have its own queue.

Fixes #3220
2020-04-26 01:14:52 -04:00

105 lines
5.6 KiB
Diff

From 86c75a3c0ae4e295e196d3faf1e43f12e9f10782 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 19 Apr 2020 00:05:46 -0400
Subject: [PATCH] Fix Longstanding Broken behavior of PlayerJoinEvent
For years, plugin developers have had to delay many things they do
inside of the PlayerJoinEvent by 1 tick to make it actually work.
This all boiled down to 1 reason why: The event fired before the
player was fully ready and joined to the world!
Additionally, if that player logged out on a vehicle, the event
fired before the vehicle was even loaded, so that plugins had no
access to the vehicle during this event either.
This change finally fixes this issue, fully preparing the player
into the world as a fully ready entity, vehicle included.
There should be no plugins that break because of this change, but might
improve consistency with other plugins instead.
For example, if 2 plugins listens to this event, and the first one
teleported the player in the event, then the 2nd plugin actually
would be getting a valid player!
This was very non deterministic. This change will ensure every plugin
receives a deterministic result, and should no longer require 1 tick
delays anymore.
diff --git a/src/main/java/net/minecraft/server/EntityPlayer.java b/src/main/java/net/minecraft/server/EntityPlayer.java
index f3928b8f6f..686fd4cbad 100644
--- a/src/main/java/net/minecraft/server/EntityPlayer.java
+++ b/src/main/java/net/minecraft/server/EntityPlayer.java
@@ -104,6 +104,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
public double maxHealthCache;
public boolean joining = true;
public boolean sentListPacket = false;
+ public boolean supressTrackerForLogin = false; // Paper
public Integer clientViewDistance;
// CraftBukkit end
public PlayerNaturallySpawnCreaturesEvent playerNaturallySpawnedEvent; // Paper
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index f5a28e9322..9425b36403 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -1569,6 +1569,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
.printStackTrace();
return;
}
+ if (entity instanceof EntityPlayer && ((EntityPlayer) entity).supressTrackerForLogin) return; // Delay adding to tracker until after list packets
// Paper end
if (!(entity instanceof EntityComplexPart)) {
if (!(entity instanceof EntityLightning)) {
diff --git a/src/main/java/net/minecraft/server/PlayerList.java b/src/main/java/net/minecraft/server/PlayerList.java
index 7403be0b25..ec45c30dd3 100644
--- a/src/main/java/net/minecraft/server/PlayerList.java
+++ b/src/main/java/net/minecraft/server/PlayerList.java
@@ -175,6 +175,12 @@ public abstract class PlayerList {
this.j.put(entityplayer.getUniqueID(), entityplayer);
// this.sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, new EntityPlayer[]{entityplayer})); // CraftBukkit - replaced with loop below
+ // Paper start - correctly register player BEFORE PlayerJoinEvent, so the entity is valid and doesn't require tick delay hacks
+ entityplayer.supressTrackerForLogin = true;
+ worldserver.addPlayerJoin(entityplayer);
+ this.server.getBossBattleCustomData().a(entityplayer); // see commented out section below worldserver.addPlayerJoin(entityplayer);
+ mountSavedVehicle(entityplayer, worldserver, nbttagcompound);
+ // Paper end
// CraftBukkit start
PlayerJoinEvent playerJoinEvent = new PlayerJoinEvent(cserver.getPlayer(entityplayer), joinMessage);
cserver.getPluginManager().callEvent(playerJoinEvent);
@@ -209,6 +215,8 @@ public abstract class PlayerList {
entityplayer.playerConnection.sendPacket(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, new EntityPlayer[] { entityplayer1}));
}
entityplayer.sentListPacket = true;
+ entityplayer.supressTrackerForLogin = false; // Paper
+ ((WorldServer)entityplayer.world).getChunkProvider().playerChunkMap.addEntity(entityplayer); // Paper - track entity now
// CraftBukkit end
entityplayer.playerConnection.sendPacket(new PacketPlayOutEntityMetadata(entityplayer.getId(), entityplayer.datawatcher, true)); // CraftBukkit - BungeeCord#2321, send complete data to self on spawn
@@ -234,6 +242,11 @@ public abstract class PlayerList {
playerconnection.sendPacket(new PacketPlayOutEntityEffect(entityplayer.getId(), mobeffect));
}
+ // Paper start - move vehicle into method so it can be called above - short circuit around that code
+ onPlayerJoinFinish(entityplayer, worldserver, s1);
+ }
+ private void mountSavedVehicle(EntityPlayer entityplayer, WorldServer worldserver, NBTTagCompound nbttagcompound) {
+ // Paper end
if (nbttagcompound != null && nbttagcompound.hasKeyOfType("RootVehicle", 10)) {
NBTTagCompound nbttagcompound1 = nbttagcompound.getCompound("RootVehicle");
// CraftBukkit start
@@ -275,6 +288,10 @@ public abstract class PlayerList {
}
}
+ // Paper start
+ }
+ public void onPlayerJoinFinish(EntityPlayer entityplayer, WorldServer worldserver, String s1) {
+ // Paper end
entityplayer.syncInventory();
// Paper start - Add to collideRule team if needed
final Scoreboard scoreboard = this.getServer().getWorldServer(DimensionManager.OVERWORLD).getScoreboard();
--
2.26.2