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Tighten logic for handling target tick times in tick scheduler (#4010)

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No longer rely on world time as plugins like to screw it up.

Add a new flag -Dpaper.ticklist-max-tick-delay= that
will automatically drop any tick entries that have a delay
exceeding the specified amount. This is only useful
for cleaning up a world that has been corrupted by
certain blocks having a huge tick delay.

Aimed at resolving #3251

Also fix an issue with some rails connecting incorrectly
that I found when testing.

Co-authored-by: Spottedleaf <Spottedleaf@users.noreply.github.com>
This commit is contained in:
Spottedleaf 2020-07-27 20:05:27 -07:00
parent 529c4f9f90
commit b6aced22de
2 changed files with 137 additions and 6 deletions
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95
Spigot-Server-Patches/Fix-some-rails-connecting-improperly.patch Normal file
View file

@ -0,0 +1,95 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <spottedleaf@spottedleaf.dev>
Date: Fri, 24 Jul 2020 15:56:05 -0700
Subject: [PATCH] Fix some rails connecting improperly
diff --git a/src/main/java/net/minecraft/server/BlockMinecartDetector.java b/src/main/java/net/minecraft/server/BlockMinecartDetector.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/BlockMinecartDetector.java
+++ b/src/main/java/net/minecraft/server/BlockMinecartDetector.java
@@ -0,0 +0,0 @@ public class BlockMinecartDetector extends BlockMinecartTrackAbstract {
}
private void a(World world, BlockPosition blockposition, IBlockData iblockdata) {
+ if (iblockdata.getBlock() != this) { return; } // Paper - not our block, don't do anything
boolean flag = (Boolean) iblockdata.get(BlockMinecartDetector.POWERED);
boolean flag1 = false;
List<EntityMinecartAbstract> list = this.a(world, blockposition, EntityMinecartAbstract.class, (Predicate) null);
diff --git a/src/main/java/net/minecraft/server/BlockMinecartTrackAbstract.java b/src/main/java/net/minecraft/server/BlockMinecartTrackAbstract.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/BlockMinecartTrackAbstract.java
+++ b/src/main/java/net/minecraft/server/BlockMinecartTrackAbstract.java
@@ -0,0 +0,0 @@ public abstract class BlockMinecartTrackAbstract extends Block {
iblockdata = this.a(world, blockposition, iblockdata, true);
if (this.c) {
iblockdata.doPhysics(world, blockposition, this, blockposition, flag);
+ iblockdata = world.getType(blockposition); // Paper - don't desync, update again
}
return iblockdata;
diff --git a/src/main/java/net/minecraft/server/MinecartTrackLogic.java b/src/main/java/net/minecraft/server/MinecartTrackLogic.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/MinecartTrackLogic.java
+++ b/src/main/java/net/minecraft/server/MinecartTrackLogic.java
@@ -0,0 +0,0 @@ import javax.annotation.Nullable;
public class MinecartTrackLogic {
- private final World a;
- private final BlockPosition b;
+ private final World a; public final World getWorld() { return this.a; } // Paper - OBFHELPER
+ private final BlockPosition b; public final BlockPosition getPos() { return this.b; } // Paper - OBFHELPER
private final BlockMinecartTrackAbstract c;
- private IBlockData d;
+ private IBlockData d; public final IBlockData getRailState() { return this.d; } // Paper - OBFHELPER
private final boolean e;
private final List<BlockPosition> f = Lists.newArrayList();
+ // Paper start - prevent desync
+ public boolean isValid() {
+ return this.getWorld().getType(this.getPos()).getBlock() == this.getRailState().getBlock();
+ }
+ // Paper end - prevent desync
+
public MinecartTrackLogic(World world, BlockPosition blockposition, IBlockData iblockdata) {
this.a = world;
this.b = blockposition;
@@ -0,0 +0,0 @@ public class MinecartTrackLogic {
}
private void c(MinecartTrackLogic minecarttracklogic) {
+ // Paper start - prevent desync
+ if (!this.isValid() || !minecarttracklogic.isValid()) {
+ return;
+ }
+ // Paper end - prevent desync
this.f.add(minecarttracklogic.b);
BlockPosition blockposition = this.b.north();
BlockPosition blockposition1 = this.b.south();
@@ -0,0 +0,0 @@ public class MinecartTrackLogic {
this.d = (IBlockData) this.d.set(this.c.d(), blockpropertytrackposition1);
if (flag1 || this.a.getType(this.b) != this.d) {
this.a.setTypeAndData(this.b, this.d, 3);
+ // Paper start - prevent desync
+ if (!this.isValid()) {
+ return this;
+ }
+ // Paper end - prevent desync
for (int i = 0; i < this.f.size(); ++i) {
MinecartTrackLogic minecarttracklogic = this.b((BlockPosition) this.f.get(i));
- if (minecarttracklogic != null) {
+ if (minecarttracklogic != null && minecarttracklogic.isValid()) { // Paper - prevent desync
minecarttracklogic.d();
if (minecarttracklogic.b(this)) {
minecarttracklogic.c(this);
@@ -0,0 +0,0 @@ public class MinecartTrackLogic {
}
public IBlockData c() {
- return this.d;
+ return this.getWorld().getType(this.getPos()); // Paper - prevent desync
}
}

48
Spigot-Server-Patches/Optimise-TickListServer-by-rewriting-it.patch
View file

@ -72,7 +72,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
+import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.objects.ObjectRBTreeSet;
+import net.minecraft.server.BaseBlockPosition;
+import net.minecraft.server.BlockPosition;
+import net.minecraft.server.ChunkCoordIntPair;
+import net.minecraft.server.ChunkProviderServer;
@ -96,7 +95,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import java.util.stream.Stream;
+
+public final class PaperTickList<T> extends TickListServer<T> { // extend to avoid breaking ABI
+
@ -268,7 +266,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ }
+
+ private void prepare() {
+ final long currentTick = this.world.getTime();
+ final long currentTick = this.nextTick;
+
+ final ChunkProviderServer chunkProvider = this.world.getChunkProvider();
+
@ -333,8 +331,18 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ }
+ }
+
+ private boolean warnedAboutDesync;
+
+ @Override
+ public void tick() {
+ ++this.nextTick;
+ if (this.nextTick != this.world.getTime()) {
+ if (!this.warnedAboutDesync) {
+ this.warnedAboutDesync = true;
+ MinecraftServer.LOGGER.error("World tick desync detected! Expected " + this.nextTick + " ticks, but got " + this.world.getTime() + " ticks for world '" + this.world.getWorld().getName() + "'", new Throwable());
+ MinecraftServer.LOGGER.error("Preventing redstone from breaking by refusing to accept new tick time");
+ }
+ }
+ final ChunkProviderServer chunkProvider = this.world.getChunkProvider();
+
+ this.world.getMethodProfiler().enter("cleaning");
@ -345,7 +353,6 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ // this must be done here in case something schedules in the tick code
+ this.shortScheduled[this.shortScheduledIndex].clear();
+ this.shortScheduledIndex = getNextIndex(this.shortScheduledIndex, SHORT_SCHEDULE_TICK_THRESHOLD);
+ this.nextTick = this.world.getTime() + 1;
+
+ this.timingCleanup.stopTiming();
+ this.world.getMethodProfiler().exitEnter("ticking");
@ -472,7 +479,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+
+ @Override
+ public void schedule(BlockPosition blockPosition, T t, int i, TickListPriority tickListPriority) {
+ this.schedule(blockPosition, t, i + this.world.getTime(), tickListPriority);
+ this.schedule(blockPosition, t, i + this.nextTick, tickListPriority);
+ }
+
+ public void schedule(final NextTickListEntry<T> entry) {
@ -644,7 +651,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
+ // start copy from TickListServer // TODO check on update
+ List<NextTickListEntry<T>> list = this.getEntriesInChunk(chunkcoordintpair, false, true);
+
+ return TickListServer.serialize(this.getMinecraftKeyFrom, list, this.world.getTime());
+ return TickListServer.serialize(this.getMinecraftKeyFrom, list, this.nextTick);
+ // end copy from TickListServer
+ }
+
@ -1032,6 +1039,35 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
public boolean b(BaseBlockPosition baseblockposition) {
return baseblockposition.getX() >= this.a && baseblockposition.getX() <= this.d && baseblockposition.getZ() >= this.c && baseblockposition.getZ() <= this.f && baseblockposition.getY() >= this.b && baseblockposition.getY() <= this.e;
}
diff --git a/src/main/java/net/minecraft/server/TickListChunk.java b/src/main/java/net/minecraft/server/TickListChunk.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/TickListChunk.java
+++ b/src/main/java/net/minecraft/server/TickListChunk.java
@@ -0,0 +0,0 @@ public class TickListChunk<T> implements TickList<T> {
return nbttaglist;
}
+ private static final int MAX_TICK_DELAY = Integer.getInteger("paper.ticklist-max-tick-delay", -1).intValue(); // Paper - clean up broken entries
+
public static <T> TickListChunk<T> a(NBTTagList nbttaglist, Function<T, MinecraftKey> function, Function<MinecraftKey, T> function1) {
List<TickListChunk.a<T>> list = Lists.newArrayList();
@@ -0,0 +0,0 @@ public class TickListChunk<T> implements TickList<T> {
if (t0 != null) {
BlockPosition blockposition = new BlockPosition(nbttagcompound.getInt("x"), nbttagcompound.getInt("y"), nbttagcompound.getInt("z"));
- list.add(new TickListChunk.a<>(t0, blockposition, nbttagcompound.getInt("t"), TickListPriority.a(nbttagcompound.getInt("p"))));
+ // Paper start - clean up broken entries
+ int delay = nbttagcompound.getInt("t");
+ if (MAX_TICK_DELAY > 0 && delay > MAX_TICK_DELAY) {
+ MinecraftServer.LOGGER.warn("Dropping tick for pos " + blockposition + ", tick delay " + delay);
+ continue;
+ }
+ list.add(new TickListChunk.a<>(t0, blockposition, delay, TickListPriority.a(nbttagcompound.getInt("p"))));
+ // Paper end - clean up broken entries
}
}
diff --git a/src/main/java/net/minecraft/server/TickListServer.java b/src/main/java/net/minecraft/server/TickListServer.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/TickListServer.java