From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar Date: Thu, 26 Jul 2018 00:11:12 -0400 Subject: [PATCH] Prevent Saving Bad entities to chunks See https://github.com/PaperMC/Paper/issues/1223 Minecraft is saving invalid entities to the chunk files. Avoid saving bad data, and also make improvements to handle loading these chunks. Any invalid entity will be instant killed, so lets avoid adding it to the world... This lets us be safer about the dupe UUID resolver too, as now we can ignore instant killed entities and avoid risk of duplicating an invalid entity. This should reduce log occurrences of dupe uuid messages. diff --git a/src/main/java/net/minecraft/server/ChunkRegionLoader.java b/src/main/java/net/minecraft/server/ChunkRegionLoader.java index f30071fe5c1f33386829cc61d8c6976a39eff24f..1e28061dd83a4bf2daab38aee84ddba3329b28dc 100644 --- a/src/main/java/net/minecraft/server/ChunkRegionLoader.java +++ b/src/main/java/net/minecraft/server/ChunkRegionLoader.java @@ -301,6 +301,7 @@ public class ChunkRegionLoader { nbttagcompound1.set("TileEntities", nbttaglist1); NBTTagList nbttaglist2 = new NBTTagList(); + java.util.List toUpdate = new java.util.ArrayList<>(); // Paper if (ichunkaccess.getChunkStatus().getType() == ChunkStatus.Type.LEVELCHUNK) { Chunk chunk = (Chunk) ichunkaccess; @@ -312,13 +313,28 @@ public class ChunkRegionLoader { while (iterator1.hasNext()) { Entity entity = (Entity) iterator1.next(); NBTTagCompound nbttagcompound4 = new NBTTagCompound(); - + // Paper start + if ((int) Math.floor(entity.locX()) >> 4 != chunk.getPos().x || (int) Math.floor(entity.locZ()) >> 4 != chunk.getPos().z) { + toUpdate.add(entity); + continue; + } + if (entity.dead || hasPlayerPassenger(entity)) { + continue; + } + // Paper end if (entity.d(nbttagcompound4)) { chunk.d(true); nbttaglist2.add(nbttagcompound4); } } } + + // Paper start - move entities to the correct chunk + for (Entity entity : toUpdate) { + worldserver.chunkCheck(entity); + } + // Paper end + } else { ProtoChunk protochunk = (ProtoChunk) ichunkaccess; @@ -377,6 +393,19 @@ public class ChunkRegionLoader { nbttagcompound1.set("Structures", a(chunkcoordintpair, ichunkaccess.h(), ichunkaccess.v())); return nbttagcompound; } + // Paper start - this is saved with the player + private static boolean hasPlayerPassenger(Entity entity) { + for (Entity passenger : entity.passengers) { + if (passenger instanceof EntityPlayer) { + return true; + } + if (hasPlayerPassenger(passenger)) { + return true; + } + } + return false; + } + // Paper end public static ChunkStatus.Type a(@Nullable NBTTagCompound nbttagcompound) { if (nbttagcompound != null) { diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java index 04e57c81d0e58a801ad8e842c48fc6a143de70f2..186a7b1435132f0795b74ee843f8a4c830aa9f43 100644 --- a/src/main/java/net/minecraft/server/WorldServer.java +++ b/src/main/java/net/minecraft/server/WorldServer.java @@ -1040,6 +1040,7 @@ public class WorldServer extends World implements GeneratorAccessSeed { List[] aentityslice = chunk.getEntitySlices(); // Spigot int i = aentityslice.length; + java.util.List toMoveChunks = new java.util.ArrayList<>(); // Paper for (int j = 0; j < i; ++j) { List entityslice = aentityslice[j]; // Spigot Iterator iterator = entityslice.iterator(); @@ -1052,11 +1053,25 @@ public class WorldServer extends World implements GeneratorAccessSeed { throw (IllegalStateException) SystemUtils.c((Throwable) (new IllegalStateException("Removing entity while ticking!"))); } + // Paper start - move out entities that shouldn't be in this chunk before it unloads + if (!entity.dead && (int) Math.floor(entity.locX()) >> 4 != chunk.getPos().x || (int) Math.floor(entity.locZ()) >> 4 != chunk.getPos().z) { + toMoveChunks.add(entity); + continue; + } + // Paper end + this.entitiesById.remove(entity.getId()); this.unregisterEntity(entity); + + if (entity.dead) iterator.remove(); // Paper - don't save dead entities during unload } } } + // Paper start - move out entities that shouldn't be in this chunk before it unloads + for (Entity entity : toMoveChunks) { + this.chunkCheck(entity); + } + // Paper end }