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c5a10665b8
Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
53 lines
3.5 KiB
Diff
53 lines
3.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Fri, 27 Dec 2019 09:42:26 -0800
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Subject: [PATCH] Guard against serializing mismatching chunk coordinate
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Should help if something dumb happens
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diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
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index 47f5f3d58bb3bf85cf35f9baae77df7fab5c844f..0dd6f1bce4913cb84ba21a20df5573bab3a64645 100644
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--- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
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+++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkSerializer.java
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@@ -88,8 +88,21 @@ public class ChunkSerializer {
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public ChunkSerializer() {}
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+ // Paper start - guard against serializing mismatching coordinates
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+ // TODO Note: This needs to be re-checked each update
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+ public static ChunkPos getChunkCoordinate(final CompoundTag chunkData) {
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+ final int dataVersion = ChunkStorage.getVersion(chunkData);
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+ if (dataVersion < 2842) { // Level tag is removed after this version
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+ final CompoundTag levelData = chunkData.getCompound("Level");
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+ return new ChunkPos(levelData.getInt("xPos"), levelData.getInt("zPos"));
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+ } else {
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+ return new ChunkPos(chunkData.getInt("xPos"), chunkData.getInt("zPos"));
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+ }
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+ }
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+ // Paper end - guard against serializing mismatching coordinates
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+
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public static ProtoChunk read(ServerLevel world, PoiManager poiStorage, RegionStorageInfo key, ChunkPos chunkPos, CompoundTag nbt) {
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- ChunkPos chunkcoordintpair1 = new ChunkPos(nbt.getInt("xPos"), nbt.getInt("zPos"));
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+ ChunkPos chunkcoordintpair1 = new ChunkPos(nbt.getInt("xPos"), nbt.getInt("zPos")); // Paper - guard against serializing mismatching coordinates; diff on change, see ChunkSerializer#getChunkCoordinate
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if (!Objects.equals(chunkPos, chunkcoordintpair1)) {
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ChunkSerializer.LOGGER.error("Chunk file at {} is in the wrong location; relocating. (Expected {}, got {})", new Object[]{chunkPos, chunkPos, chunkcoordintpair1});
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diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkStorage.java b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkStorage.java
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index 3e194944e50f8395074d68d4abe4c084c3fadcc1..9aa9ab894080a5819fc45698771afd034906d36a 100644
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--- a/src/main/java/net/minecraft/world/level/chunk/storage/ChunkStorage.java
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+++ b/src/main/java/net/minecraft/world/level/chunk/storage/ChunkStorage.java
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@@ -172,6 +172,13 @@ public class ChunkStorage implements AutoCloseable {
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}
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public CompletableFuture<Void> write(ChunkPos chunkPos, CompoundTag nbt) {
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+ // Paper start - guard against serializing mismatching coordinates
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+ if (nbt != null && !chunkPos.equals(ChunkSerializer.getChunkCoordinate(nbt))) {
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+ final String world = (this instanceof net.minecraft.server.level.ChunkMap) ? ((net.minecraft.server.level.ChunkMap) this).level.getWorld().getName() : null;
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+ throw new IllegalArgumentException("Chunk coordinate and serialized data do not have matching coordinates, trying to serialize coordinate " + chunkPos
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+ + " but compound says coordinate is " + ChunkSerializer.getChunkCoordinate(nbt) + (world == null ? " for an unknown world" : (" for world: " + world)));
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+ }
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+ // Paper end - guard against serializing mismatching coordinates
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this.handleLegacyStructureIndex(chunkPos);
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return this.worker.store(chunkPos, nbt);
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}
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