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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.
96 lines
5.2 KiB
Diff
96 lines
5.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
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Date: Fri, 29 Jul 2022 12:35:19 -0400
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Subject: [PATCH] Warn on plugins accessing faraway chunks
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diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
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index b4111bcc6a676dc42b233761aa667708669c2ab8..cc92d2e8b77c75da1d8b850c3bc251e8ac221c24 100644
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--- a/src/main/java/net/minecraft/world/level/Level.java
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+++ b/src/main/java/net/minecraft/world/level/Level.java
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@@ -339,7 +339,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
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}
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private static boolean isInWorldBoundsHorizontal(BlockPos pos) {
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- return pos.getX() >= -30000000 && pos.getZ() >= -30000000 && pos.getX() < 30000000 && pos.getZ() < 30000000;
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+ return pos.getX() >= -30000000 && pos.getZ() >= -30000000 && pos.getX() < 30000000 && pos.getZ() < 30000000; // Diff on change warnUnsafeChunk()
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}
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private static boolean isOutsideSpawnableHeight(int y) {
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
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index a1912eb5fd26898d7e9848ffb2052fce2fa10868..cb28a7504e809a8b1e8ab6e34e14e414c542055f 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
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@@ -305,9 +305,24 @@ public class CraftWorld extends CraftRegionAccessor implements World {
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public boolean setSpawnLocation(int x, int y, int z) {
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return this.setSpawnLocation(x, y, z, 0.0F);
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}
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+ // Paper start
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+ private static void warnUnsafeChunk(String reason, int x, int z) {
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+ // if any chunk coord is outside of 30 million blocks
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+ if (x > 1875000 || z > 1875000 || x < -1875000 || z < -1875000) {
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+ Plugin plugin = io.papermc.paper.util.StackWalkerUtil.getFirstPluginCaller();
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+ if (plugin != null) {
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+ plugin.getLogger().warning("Plugin is %s at (%s, %s), this might cause issues.".formatted(reason, x, z));
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+ }
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+ if (net.minecraft.server.MinecraftServer.getServer().isDebugging()) {
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+ io.papermc.paper.util.TraceUtil.dumpTraceForThread("Dangerous chunk retrieval");
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+ }
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+ }
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+ }
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+ // Paper end
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@Override
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public Chunk getChunkAt(int x, int z) {
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+ warnUnsafeChunk("getting a faraway chunk", x, z); // Paper
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// Paper start - add ticket to hold chunk for a little while longer if plugin accesses it
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net.minecraft.world.level.chunk.LevelChunk chunk = this.world.getChunkSource().getChunkAtIfLoadedImmediately(x, z);
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if (chunk == null) {
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@@ -413,6 +428,7 @@ public class CraftWorld extends CraftRegionAccessor implements World {
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if (!unloadChunk0(x, z, false)) {
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return false;
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}
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+ warnUnsafeChunk("regenerating a faraway chunk", x, z); // Paper
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final long chunkKey = ChunkCoordIntPair.pair(x, z);
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world.getChunkProvider().unloadQueue.remove(chunkKey);
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@@ -486,6 +502,7 @@ public class CraftWorld extends CraftRegionAccessor implements World {
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@Override
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public boolean loadChunk(int x, int z, boolean generate) {
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org.spigotmc.AsyncCatcher.catchOp("chunk load"); // Spigot
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+ warnUnsafeChunk("loading a faraway chunk", x, z); // Paper
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ChunkAccess chunk = this.world.getChunkSource().getChunk(x, z, generate || isChunkGenerated(x, z) ? ChunkStatus.FULL : ChunkStatus.EMPTY, true); // Paper
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// If generate = false, but the chunk already exists, we will get this back.
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@@ -518,6 +535,7 @@ public class CraftWorld extends CraftRegionAccessor implements World {
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@Override
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public boolean addPluginChunkTicket(int x, int z, Plugin plugin) {
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+ warnUnsafeChunk("adding a faraway chunk ticket", x, z); // Paper
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Preconditions.checkArgument(plugin != null, "null plugin");
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Preconditions.checkArgument(plugin.isEnabled(), "plugin is not enabled");
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@@ -618,6 +636,7 @@ public class CraftWorld extends CraftRegionAccessor implements World {
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@Override
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public void setChunkForceLoaded(int x, int z, boolean forced) {
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+ warnUnsafeChunk("forceloading a faraway chunk", x, z); // Paper
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this.getHandle().setChunkForced(x, z, forced);
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}
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@@ -946,6 +965,7 @@ public class CraftWorld extends CraftRegionAccessor implements World {
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@Override
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public int getHighestBlockYAt(int x, int z, org.bukkit.HeightMap heightMap) {
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+ warnUnsafeChunk("getting a faraway chunk", x >> 4, z >> 4); // Paper
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// Transient load for this tick
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return this.world.getChunk(x >> 4, z >> 4).getHeight(CraftHeightMap.toNMS(heightMap), x, z);
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}
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@@ -2343,6 +2363,7 @@ public class CraftWorld extends CraftRegionAccessor implements World {
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// Spigot end
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// Paper start
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public java.util.concurrent.CompletableFuture<Chunk> getChunkAtAsync(int x, int z, boolean gen, boolean urgent) {
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+ warnUnsafeChunk("getting a faraway chunk async", x, z); // Paper
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if (Bukkit.isPrimaryThread()) {
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net.minecraft.world.level.chunk.LevelChunk immediate = this.world.getChunkSource().getChunkAtIfLoadedImmediately(x, z);
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if (immediate != null) {
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