From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar 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/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java index 43e5e148f1289ff5e42311981c597c66d98447aa..f4b14d77d5c256852677bd9bc6dbda2bbe5367e3 100644 --- a/src/main/java/net/minecraft/server/level/ChunkMap.java +++ b/src/main/java/net/minecraft/server/level/ChunkMap.java @@ -1608,6 +1608,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider .printStackTrace(); return; } + if (entity instanceof ServerPlayer && ((ServerPlayer) entity).supressTrackerForLogin) return; // Delay adding to tracker until after list packets // Paper end if (!(entity instanceof EnderDragonPart)) { EntityType entitytypes = entity.getType(); diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java index 96932bc40d8a0fd865764ba0b77655ffb55c04f5..95ed3dba34539d07800bd7e34571471d6818e58e 100644 --- a/src/main/java/net/minecraft/server/level/ServerPlayer.java +++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java @@ -245,6 +245,7 @@ public class ServerPlayer extends Player { public double maxHealthCache; public boolean joining = true; public boolean sentListPacket = false; + public boolean supressTrackerForLogin = false; // Paper public Integer clientViewDistance; public String kickLeaveMessage = null; // SPIGOT-3034: Forward leave message to PlayerQuitEvent // CraftBukkit end diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java index bb7260a179de2652accb79b5bd0f0e6624163ab4..e7904870da5134b397f93c4de29d804775830947 100644 --- a/src/main/java/net/minecraft/server/players/PlayerList.java +++ b/src/main/java/net/minecraft/server/players/PlayerList.java @@ -276,6 +276,12 @@ public abstract class PlayerList { this.playersByUUID.put(player.getUUID(), player); // this.broadcastAll(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 + player.supressTrackerForLogin = true; + worldserver1.addNewPlayer(player); + this.server.getCustomBossEvents().onPlayerConnect(player); // see commented out section below worldserver.addPlayerJoin(entityplayer); + mountSavedVehicle(player, worldserver1, nbttagcompound); + // Paper end // CraftBukkit start CraftPlayer bukkitPlayer = player.getBukkitEntity(); @@ -316,6 +322,8 @@ public abstract class PlayerList { player.connection.send(new ClientboundPlayerInfoPacket(ClientboundPlayerInfoPacket.Action.ADD_PLAYER, new ServerPlayer[]{entityplayer1})); } player.sentListPacket = true; + player.supressTrackerForLogin = false; // Paper + ((ServerLevel)player.level).getChunkSource().chunkMap.addEntity(player); // Paper - track entity now // CraftBukkit end player.connection.send(new ClientboundSetEntityDataPacket(player.getId(), player.getEntityData(), true)); // CraftBukkit - BungeeCord#2321, send complete data to self on spawn @@ -341,6 +349,11 @@ public abstract class PlayerList { playerconnection.send(new ClientboundUpdateMobEffectPacket(player.getId(), mobeffect)); } + // Paper start - move vehicle into method so it can be called above - short circuit around that code + onPlayerJoinFinish(player, worldserver1, s1); + } + private void mountSavedVehicle(ServerPlayer player, ServerLevel worldserver1, CompoundTag nbttagcompound) { + // Paper end if (nbttagcompound != null && nbttagcompound.contains("RootVehicle", 10)) { CompoundTag nbttagcompound1 = nbttagcompound.getCompound("RootVehicle"); // CraftBukkit start @@ -389,6 +402,10 @@ public abstract class PlayerList { } } + // Paper start + } + public void onPlayerJoinFinish(ServerPlayer player, ServerLevel worldserver1, String s1) { + // Paper end player.initInventoryMenu(); // CraftBukkit - Moved from above, added world // Paper start - Add to collideRule team if needed @@ -398,6 +415,7 @@ public abstract class PlayerList { scoreboard.addPlayerToTeam(player.getScoreboardName(), collideRuleTeam); } // Paper end + // CraftBukkit - Moved from above, added world PlayerList.LOGGER.info("{}[{}] logged in with entity id {} at ([{}]{}, {}, {})", player.getName().getString(), s1, player.getId(), worldserver1.serverLevelData.getLevelName(), player.getX(), player.getY(), player.getZ()); }