Paper/patches/server/0631-Fix-and-optimise-world-force-upgrading.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Thu, 20 May 2021 07:02:22 -0700
Subject: [PATCH] Fix and optimise world force upgrading

The WorldUpgrader class was incorrectly modified by
CB. It will store an IChunkLoader instance for all
dimension types in the world, but obviously with how
CB shifts around worlds only one dimension type exists
per world. But this would be OK if CB did this
change correctly. All IChunkLoader instances
will point to the same regionfiles. And all
IChunkLoader instances are going to be read from.

This problem hasn't really been reported because
it relies on the persistent legacy data to be converted
as well to cause corruption. Why? Because the legacy
data is also shared, it will result in different
outputs from conversion (as once conversion for legacy
persistent data takes place, it is REMOVED - so the next
convert will _not_ have the data). Which means different
sizes on disk. Which means different regionfile sector
allocations. Which means there are 3 different possible
regionfile sector allocations in memory, and none of them
are going to be correct.

I've fixed this by writing a world upgrader suited to
CB's changes to world folder format. It was brain dead
easy to add threading, so I did.

== AT ==
public net.minecraft.util.worldupdate.WorldUpgrader REGEX

diff --git a/src/main/java/io/papermc/paper/world/ThreadedWorldUpgrader.java b/src/main/java/io/papermc/paper/world/ThreadedWorldUpgrader.java
new file mode 100644
index 0000000000000000000000000000000000000000..95cac7edae8ac64811fc6a2f6b97dd4a0fceb0b0
--- /dev/null
+++ b/src/main/java/io/papermc/paper/world/ThreadedWorldUpgrader.java
@@ -0,0 +1,209 @@
+package io.papermc.paper.world;
+
+import com.mojang.datafixers.DataFixer;
+import com.mojang.serialization.Codec;
+import net.minecraft.SharedConstants;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.util.worldupdate.WorldUpgrader;
+import net.minecraft.world.level.ChunkPos;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.chunk.ChunkGenerator;
+import net.minecraft.world.level.chunk.storage.ChunkStorage;
+import net.minecraft.world.level.chunk.storage.RegionFileStorage;
+import net.minecraft.world.level.dimension.DimensionType;
+import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.levelgen.WorldGenSettings;
+import net.minecraft.world.level.storage.DimensionDataStorage;
+import net.minecraft.world.level.storage.LevelStorageSource;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import java.io.File;
+import java.io.IOException;
+import java.text.DecimalFormat;
+import java.util.Optional;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadFactory;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicLong;
+import java.util.function.Supplier;
+
+public class ThreadedWorldUpgrader {
+
+    private static final Logger LOGGER = LogManager.getLogger();
+
+    private final ResourceKey<LevelStem> dimensionType;
+    private final String worldName;
+    private final File worldDir;
+    private final ExecutorService threadPool;
+    private final DataFixer dataFixer;
+    private final Optional<ResourceKey<Codec<? extends ChunkGenerator>>> generatorKey;
+    private final boolean removeCaches;
+
+    public ThreadedWorldUpgrader(final ResourceKey<LevelStem> dimensionType, final String worldName, final File worldDir, final int threads,
+                                 final DataFixer dataFixer, final Optional<ResourceKey<Codec<? extends ChunkGenerator>>> generatorKey, final boolean removeCaches) {
+        this.dimensionType = dimensionType;
+        this.worldName = worldName;
+        this.worldDir = worldDir;
+        this.threadPool = Executors.newFixedThreadPool(Math.max(1, threads), new ThreadFactory() {
+            private final AtomicInteger threadCounter = new AtomicInteger();
+
+            @Override
+            public Thread newThread(final Runnable run) {
+                final Thread ret = new Thread(run);
+
+                ret.setName("World upgrader thread for world " + ThreadedWorldUpgrader.this.worldName + " #" + this.threadCounter.getAndIncrement());
+                ret.setUncaughtExceptionHandler((thread, throwable) -> {
+                    LOGGER.fatal("Error upgrading world", throwable);
+                });
+
+                return ret;
+            }
+        });
+        this.dataFixer = dataFixer;
+        this.generatorKey = generatorKey;
+        this.removeCaches = removeCaches;
+    }
+
+    public void convert() {
+        final File worldFolder = LevelStorageSource.getStorageFolder(this.worldDir.toPath(), this.dimensionType).toFile();
+        final DimensionDataStorage worldPersistentData = new DimensionDataStorage(new File(worldFolder, "data"), this.dataFixer);
+
+        final File regionFolder = new File(worldFolder, "region");
+
+        LOGGER.info("Force upgrading " + this.worldName);
+        LOGGER.info("Counting regionfiles for " + this.worldName);
+        final File[] regionFiles = regionFolder.listFiles((final File dir, final String name) -> {
+            return WorldUpgrader.REGEX.matcher(name).matches();
+        });
+        if (regionFiles == null) {
+            LOGGER.info("Found no regionfiles to convert for world " + this.worldName);
+            return;
+        }
+        LOGGER.info("Found " + regionFiles.length + " regionfiles to convert");
+        LOGGER.info("Starting conversion now for world " + this.worldName);
+
+        final WorldInfo info = new WorldInfo(() -> worldPersistentData,
+                new ChunkStorage(regionFolder.toPath(), this.dataFixer, false), this.removeCaches, this.dimensionType, this.generatorKey);
+
+        long expectedChunks = (long)regionFiles.length * (32L * 32L);
+
+        for (final File regionFile : regionFiles) {
+            final ChunkPos regionPos = RegionFileStorage.getRegionFileCoordinates(regionFile.toPath());
+            if (regionPos == null) {
+                expectedChunks -= (32L * 32L);
+                continue;
+            }
+
+            this.threadPool.execute(new ConvertTask(info, regionPos.x >> 5, regionPos.z >> 5));
+        }
+        this.threadPool.shutdown();
+
+        final DecimalFormat format = new DecimalFormat("#0.00");
+
+        final long start = System.nanoTime();
+
+        while (!this.threadPool.isTerminated()) {
+            final long current = info.convertedChunks.get();
+
+            LOGGER.info("{}% completed ({} / {} chunks)...", format.format((double)current / (double)expectedChunks * 100.0), current, expectedChunks);
+
+            try {
+                Thread.sleep(1000L);
+            } catch (final InterruptedException ignore) {}
+        }
+
+        final long end = System.nanoTime();
+
+        try {
+            info.loader.close();
+        } catch (final IOException ex) {
+            LOGGER.fatal("Failed to close chunk loader", ex);
+        }
+        LOGGER.info("Completed conversion. Took {}s, {} out of {} chunks needed to be converted/modified ({}%)",
+                (int)Math.ceil((end - start) * 1.0e-9), info.modifiedChunks.get(), expectedChunks, format.format((double)info.modifiedChunks.get() / (double)expectedChunks * 100.0));
+    }
+
+    private static final class WorldInfo {
+
+        public final Supplier<DimensionDataStorage> persistentDataSupplier;
+        public final ChunkStorage loader;
+        public final boolean removeCaches;
+        public final ResourceKey<LevelStem> worldKey;
+        public final Optional<ResourceKey<Codec<? extends ChunkGenerator>>> generatorKey;
+        public final AtomicLong convertedChunks = new AtomicLong();
+        public final AtomicLong modifiedChunks = new AtomicLong();
+
+        private WorldInfo(final Supplier<DimensionDataStorage> persistentDataSupplier, final ChunkStorage loader, final boolean removeCaches,
+                          final ResourceKey<LevelStem> worldKey, Optional<ResourceKey<Codec<? extends ChunkGenerator>>> generatorKey) {
+            this.persistentDataSupplier = persistentDataSupplier;
+            this.loader = loader;
+            this.removeCaches = removeCaches;
+            this.worldKey = worldKey;
+            this.generatorKey = generatorKey;
+        }
+    }
+
+    private static final class ConvertTask implements Runnable {
+
+        private final WorldInfo worldInfo;
+        private final int regionX;
+        private final int regionZ;
+
+        public ConvertTask(final WorldInfo worldInfo, final int regionX, final int regionZ) {
+            this.worldInfo = worldInfo;
+            this.regionX = regionX;
+            this.regionZ = regionZ;
+        }
+
+        @Override
+        public void run() {
+            final int regionCX = this.regionX << 5;
+            final int regionCZ = this.regionZ << 5;
+
+            final Supplier<DimensionDataStorage> persistentDataSupplier = this.worldInfo.persistentDataSupplier;
+            final ChunkStorage loader = this.worldInfo.loader;
+            final boolean removeCaches = this.worldInfo.removeCaches;
+            final ResourceKey<LevelStem> worldKey = this.worldInfo.worldKey;
+
+            for (int cz = regionCZ; cz < (regionCZ + 32); ++cz) {
+                for (int cx = regionCX; cx < (regionCX + 32); ++cx) {
+                    final ChunkPos chunkPos = new ChunkPos(cx, cz);
+                    try {
+                        // no need to check the coordinate of the chunk, the regionfilecache does that for us
+
+                        CompoundTag chunkNBT = (loader.read(chunkPos).join()).orElse(null);
+
+                        if (chunkNBT == null) {
+                            continue;
+                        }
+
+                        final int versionBefore = ChunkStorage.getVersion(chunkNBT);
+
+                        chunkNBT = loader.upgradeChunkTag(worldKey, persistentDataSupplier, chunkNBT, this.worldInfo.generatorKey, chunkPos, null);
+
+                        boolean modified = versionBefore < SharedConstants.getCurrentVersion().getWorldVersion();
+
+                        if (removeCaches) {
+                            final CompoundTag level = chunkNBT.getCompound("Level");
+                            modified |= level.contains("Heightmaps");
+                            level.remove("Heightmaps");
+                            modified |= level.contains("isLightOn");
+                            level.remove("isLightOn");
+                        }
+
+                        if (modified) {
+                            this.worldInfo.modifiedChunks.getAndIncrement();
+                            loader.write(chunkPos, chunkNBT);
+                        }
+                    } catch (final Exception ex) {
+                        LOGGER.error("Error upgrading chunk {}", chunkPos, ex);
+                    } finally {
+                        this.worldInfo.convertedChunks.getAndIncrement();
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/src/main/java/net/minecraft/server/Main.java b/src/main/java/net/minecraft/server/Main.java
index 2f82002c52af7304ff6b2d6fe8f094314daf0bba..5962f7a2b185d7d54a0f9e341a4fdf6e6f1c1ec5 100644
--- a/src/main/java/net/minecraft/server/Main.java
+++ b/src/main/java/net/minecraft/server/Main.java
@@ -16,6 +16,7 @@ import java.util.Objects;
 import java.util.Optional;
 import java.util.UUID;
 import java.util.function.BooleanSupplier;
+import io.papermc.paper.world.ThreadedWorldUpgrader;
 import joptsimple.NonOptionArgumentSpec;
 import joptsimple.OptionParser;
 import joptsimple.OptionSet;
@@ -314,6 +315,15 @@ public class Main {
 
     }
 
+    // Paper start - fix and optimise world upgrading
+    public static void convertWorldButItWorks(net.minecraft.resources.ResourceKey<net.minecraft.world.level.dimension.LevelStem> dimensionType, net.minecraft.world.level.storage.LevelStorageSource.LevelStorageAccess worldSession,
+                                              DataFixer dataFixer, Optional<net.minecraft.resources.ResourceKey<com.mojang.serialization.Codec<? extends net.minecraft.world.level.chunk.ChunkGenerator>>> generatorKey, boolean removeCaches) {
+        int threads = Runtime.getRuntime().availableProcessors() * 3 / 8;
+        final ThreadedWorldUpgrader worldUpgrader = new ThreadedWorldUpgrader(dimensionType, worldSession.getLevelId(), worldSession.levelDirectory.path().toFile(), threads, dataFixer, generatorKey, removeCaches);
+        worldUpgrader.convert();
+    }
+    // Paper end - fix and optimise world upgrading
+
     public static void forceUpgrade(LevelStorageSource.LevelStorageAccess session, DataFixer dataFixer, boolean eraseCache, BooleanSupplier continueCheck, WorldGenSettings generatorOptions) {
         Main.LOGGER.info("Forcing world upgrade! {}", session.getLevelId()); // CraftBukkit
         WorldUpgrader worldupgrader = new WorldUpgrader(session, dataFixer, generatorOptions, eraseCache);
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 4c405e699fc77766d6731e51a2fc03997232c9be..adacd9a7234b98124cbd8cf9af2efd4b9db6b5b4 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -545,11 +545,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
                 worlddata = new PrimaryLevelData(worldsettings, generatorsettings, Lifecycle.stable());
             }
             worlddata.checkName(name); // CraftBukkit - Migration did not rewrite the level.dat; This forces 1.8 to take the last loaded world as respawn (in this case the end)
-            if (this.options.has("forceUpgrade")) {
-                net.minecraft.server.Main.forceUpgrade(worldSession, DataFixers.getDataFixer(), this.options.has("eraseCache"), () -> {
-                    return true;
-                }, worlddata.worldGenSettings());
-            }
+            // Paper - move down
 
             PrimaryLevelData iworlddataserver = worlddata;
             WorldGenSettings generatorsettings = worlddata.worldGenSettings();
@@ -564,6 +560,13 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
                 biomeProvider = gen.getDefaultBiomeProvider(worldInfo);
             }
 
+            // Paper start - fix and optimise world upgrading
+            if (options.has("forceUpgrade")) {
+                net.minecraft.server.Main.convertWorldButItWorks(
+                    dimensionKey, worldSession, DataFixers.getDataFixer(), worlddimension.generator().getTypeNameForDataFixer(), options.has("eraseCache")
+                );
+            }
+            // Paper end - fix and optimise world upgrading
             ResourceKey<Level> worldKey = ResourceKey.create(Registry.DIMENSION_REGISTRY, dimensionKey.location());
 
             if (dimensionKey == LevelStem.OVERWORLD) {
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index c00a7913274ff246c33a9894b680955427948f45..74d9ed2606c2fd10e9b633cdb584654cfa8f0ab8 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -182,6 +182,15 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
     public final Map<Explosion.CacheKey, Float> explosionDensityCache = new HashMap<>(); // Paper - Optimize explosions
     public java.util.ArrayDeque<net.minecraft.world.level.block.RedstoneTorchBlock.Toggle> redstoneUpdateInfos; // Paper - Move from Map in BlockRedstoneTorch to here
 
+    // Paper start - fix and optimise world upgrading
+    // copied from below
+    public static ResourceKey<DimensionType> getDimensionKey(DimensionType manager) {
+        return ((org.bukkit.craftbukkit.CraftServer)org.bukkit.Bukkit.getServer()).getHandle().getServer().registryHolder.ownedRegistryOrThrow(net.minecraft.core.Registry.DIMENSION_TYPE_REGISTRY).getResourceKey(manager).orElseThrow(() -> {
+            return new IllegalStateException("Unregistered dimension type: " + manager);
+        });
+    }
+    // Paper end - fix and optimise world upgrading
+
     public CraftWorld getWorld() {
         return this.world;
     }
diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
index 7bfb0716964af5ee300150d500c97e8f90c849d4..c881d15efa94fc379ed2817a534fef3a4dd3d90d 100644
--- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
+++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
@@ -32,6 +32,28 @@ public class RegionFileStorage implements AutoCloseable {
     }
 
     // Paper start
+    public static @Nullable ChunkPos getRegionFileCoordinates(Path file) {
+        String fileName = file.getFileName().toString();
+        if (!fileName.startsWith("r.") || !fileName.endsWith(".mca")) {
+            return null;
+        }
+
+        String[] split = fileName.split("\\.");
+
+        if (split.length != 4) {
+            return null;
+        }
+
+        try {
+            int x = Integer.parseInt(split[1]);
+            int z = Integer.parseInt(split[2]);
+
+            return new ChunkPos(x << 5, z << 5);
+        } catch (NumberFormatException ex) {
+            return null;
+        }
+    }
+
     public synchronized RegionFile getRegionFileIfLoaded(ChunkPos chunkcoordintpair) {
         return this.regionCache.getAndMoveToFirst(ChunkPos.asLong(chunkcoordintpair.getRegionX(), chunkcoordintpair.getRegionZ()));
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index c330d63cc8d40092fdf70e5aea6f6ee9e8521e88..acc385d4b6852a55e93a5c19755a3d7f59a16eea 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -1204,12 +1204,7 @@ public final class CraftServer implements Server {
         }
         worlddata.checkName(name);
         worlddata.setModdedInfo(this.console.getServerModName(), this.console.getModdedStatus().shouldReportAsModified());
-
-        if (console.options.has("forceUpgrade")) {
-            net.minecraft.server.Main.forceUpgrade(worldSession, DataFixers.getDataFixer(), console.options.has("eraseCache"), () -> {
-                return true;
-            }, worlddata.worldGenSettings());
-        }
+        // Paper - move down
 
         long j = BiomeManager.obfuscateSeed(creator.seed());
         List<CustomSpawner> list = ImmutableList.of(new PhantomSpawner(), new PatrolSpawner(), new CatSpawner(), new VillageSiege(), new WanderingTraderSpawner(worlddata));
@@ -1221,6 +1216,13 @@ public final class CraftServer implements Server {
             biomeProvider = generator.getDefaultBiomeProvider(worldInfo);
         }
 
+        // Paper start - fix and optimise world upgrading
+        if (console.options.has("forceUpgrade")) {
+            net.minecraft.server.Main.convertWorldButItWorks(
+                actualDimension,  worldSession, DataFixers.getDataFixer(), worlddimension.generator().getTypeNameForDataFixer(), console.options.has("eraseCache")
+            );
+        }
+        // Paper end - fix and optimise world upgrading
         ResourceKey<net.minecraft.world.level.Level> worldKey;
         String levelName = this.getServer().getProperties().levelName;
         if (name.equals(levelName + "_nether")) {