diff options
Diffstat (limited to 'patches/unapplied/server/0296-Duplicate-UUID-Resolve-Option.patch')
-rw-r--r-- | patches/unapplied/server/0296-Duplicate-UUID-Resolve-Option.patch | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/patches/unapplied/server/0296-Duplicate-UUID-Resolve-Option.patch b/patches/unapplied/server/0296-Duplicate-UUID-Resolve-Option.patch new file mode 100644 index 0000000000..b42bece1fc --- /dev/null +++ b/patches/unapplied/server/0296-Duplicate-UUID-Resolve-Option.patch @@ -0,0 +1,90 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Aikar <[email protected]> +Date: Sat, 21 Jul 2018 14:27:34 -0400 +Subject: [PATCH] Duplicate UUID Resolve Option + +Due to a bug in https://github.com/PaperMC/Paper/commit/2e29af3df05ec0a383f48be549d1c03200756d24 +which was added all the way back in March of 2016, it was unknown (potentially not at the time) +that an entity might actually change the seed of the random object. + +At some point, EntitySquid did start setting the seed. Due to this shared random, this caused +every entity to use a Random object with a predictable seed. + +This has caused entities to potentially generate with the same UUID.... + +Over the years, servers have had entities disappear, but no sign of trouble +because CraftBukkit removed the log lines indicating that something was wrong. + +We have fixed the root issue causing duplicate UUID's, however we now have chunk +files full of entities that have the same UUID as another entity! + +When these chunks load, the 2nd entity will not be added to the world correctly. + +If that chunk loads in a different order in the future, then it will reverse and the +missing one is now the one added to the world and not the other. This results in very +inconsistent entity behavior. + +This change allows you to recover any duplicate entity by generating a new UUID for it. +This also lets you delete them instead if you don't want to risk having new entities added to +the world that you previously did not see. + +But for those who are ok with leaving this inconsistent behavior, you may use WARN or NOTHING options. + +It is recommended you regenerate the entities, as these were legit entities, and deserve your love. + +diff --git a/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatusTasks.java b/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatusTasks.java +index 412caefe776df6c8e931f6a1a48ea2525ec6610e..aff4c3d63a97d5bbde004a616f7e14fca59b5ab9 100644 +--- a/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatusTasks.java ++++ b/src/main/java/net/minecraft/world/level/chunk/status/ChunkStatusTasks.java +@@ -178,10 +178,51 @@ public class ChunkStatusTasks { + entity.discard(null); // CraftBukkit - add Bukkit remove cause + needsRemoval = true; + } ++ checkDupeUUID(world, entity); // Paper - duplicate uuid resolving + return !needsRemoval; + })); + // CraftBukkit end + } + + } ++ ++ // Paper start - duplicate uuid resolving ++ // rets true if to prevent the entity from being added ++ public static boolean checkDupeUUID(ServerLevel level, net.minecraft.world.entity.Entity entity) { ++ io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DuplicateUUID.DuplicateUUIDMode mode = level.paperConfig().entities.spawning.duplicateUuid.mode; ++ if (mode != io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DuplicateUUID.DuplicateUUIDMode.WARN ++ && mode != io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DuplicateUUID.DuplicateUUIDMode.DELETE ++ && mode != io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DuplicateUUID.DuplicateUUIDMode.SAFE_REGEN) { ++ return false; ++ } ++ net.minecraft.world.entity.Entity other = level.getEntity(entity.getUUID()); ++ ++ if (other == null || other == entity) { ++ return false; ++ } ++ ++ if (mode == io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DuplicateUUID.DuplicateUUIDMode.SAFE_REGEN && other != null && !other.isRemoved() ++ && Objects.equals(other.getEncodeId(), entity.getEncodeId()) ++ && entity.getBukkitEntity().getLocation().distance(other.getBukkitEntity().getLocation()) < level.paperConfig().entities.spawning.duplicateUuid.safeRegenDeleteRange ++ ) { ++ entity.discard(null); ++ return true; ++ } ++ if (!other.isRemoved()) { ++ switch (mode) { ++ case SAFE_REGEN: { ++ entity.setUUID(java.util.UUID.randomUUID()); ++ break; ++ } ++ case DELETE: { ++ entity.discard(org.bukkit.event.entity.EntityRemoveEvent.Cause.DISCARD); ++ return true; ++ } ++ default: ++ break; ++ } ++ } ++ return false; ++ } ++ // Paper end - duplicate uuid resolving + } |