Paper/Spigot-Server-Patches/0484-Fix-Longstanding-Broken-behavior-of-PlayerJoinEvent.patch
Aikar edd6b6a2ba
Protect the visible chunk map from plugins touching it, trim Timing Errors
Blow up if a plugin tries to mutate visibleChunks directly and prevent them
from doing so.

Also provide a safe get call if any plugins directly call get on it so
that it uses the special logic to check pending.

Also restores ABI for the visibleChunks field back to what it was too.

Additionally, remove the stack trace from Timings Stack Corruption for any
error thrown on Minecraft Timings, and tell them to get the error ABOVE this
instead, so people stop giving us useless error reports.

Also fixes a memory leak when the source map down sizes but dest map didn't,
which resulted in lingering references to old chunk holders.

Fixes #3414
2020-05-22 00:39:16 -04:00

103 lines
5.8 KiB
Diff

From 0000000000000000000000000000000000000000 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 64e00275edf38739fe6e2d79dbcb93243e765678..a87aa07b17205b52e85f7d082fa4d5169771cbb4 100644
--- a/src/main/java/net/minecraft/server/EntityPlayer.java
+++ b/src/main/java/net/minecraft/server/EntityPlayer.java
@@ -100,6 +100,7 @@ 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 9adb858f0f86dbe9defb2247dc9e6a4795fe640f..030c980b522c4cada800e5d8ca47f0b8733bf5b6 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -1537,6 +1537,7 @@ 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 c491612267977fb331368825e0d87b2fc297e9c5..40f5d9fa9069a330b6999eefa50015daa4c19217 100644
--- a/src/main/java/net/minecraft/server/PlayerList.java
+++ b/src/main/java/net/minecraft/server/PlayerList.java
@@ -177,6 +177,12 @@ 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);
@@ -211,6 +217,8 @@ 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
@@ -236,6 +244,11 @@ 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
@@ -277,6 +290,10 @@ 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();