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 0fdf33bfab3191dbb582bc401f6f0b62aadacb4e..5187988a22b55ac783147afe455a139662b67f7d 100644 --- a/src/main/java/net/minecraft/server/level/ChunkMap.java +++ b/src/main/java/net/minecraft/server/level/ChunkMap.java @@ -1653,6 +1653,7 @@ 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 db8400c7ca9aad9aeee192427661c76778bf9e47..3a40d6fe9edbd997dc9a6b8ac009c3f621ecfe51 100644 --- a/src/main/java/net/minecraft/server/level/ServerPlayer.java +++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java @@ -254,6 +254,7 @@ 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 73d22c0f5f2998050de8a231677639c60f535229..b33a7cf936fec6c1c4d39f6c156d3e6fefa3e795 100644 --- a/src/main/java/net/minecraft/server/players/PlayerList.java +++ b/src/main/java/net/minecraft/server/players/PlayerList.java @@ -281,6 +281,12 @@ 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(); @@ -322,6 +328,8 @@ 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 @@ -347,6 +355,11 @@ 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 @@ -395,6 +408,10 @@ 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 @@ -404,6 +421,7 @@ 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()); }