PaperMC/patches/server/0335-Allow-Saving-of-Oversized-Chunks.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Fri, 15 Feb 2019 01:08:19 -0500
Subject: [PATCH] Allow Saving of Oversized Chunks

Note 1.17 update: With 1.17, Entities are no longer stored in chunk slices, so this needs updating!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

The Minecraft World Region File format has a hard cap of 1MB per chunk.
This is due to the fact that the header of the file format only allocates
a single byte for sector count, meaning a maximum of 256 sectors, at 4k per sector.

This limit can be reached fairly easily with books, resulting in the chunk being unable
to save to the world. Worse off, is that nothing printed when this occured, and silently
performed a chunk rollback on next load.

This leads to security risk with duplication and is being actively exploited.

This patch catches the too large scenario, falls back and moves any large Entity
or Tile Entity into a new compound, and this compound is saved into a different file.

On Chunk Load, we check for oversized status, and if so, we load the extra file and
merge the Entities and Tile Entities from the oversized chunk back into the level to
then be loaded as normal.

Once a chunk is returned back to normal size, the oversized flag will clear, and no
extra data file will exist.

This fix maintains compatability with all existing Anvil Region Format tools as it
does not alter the save format. They will just not know about the extra entities.

This fix also maintains compatability if someone switches server jars to one without
this fix, as the data will remain in the oversized file. Once the server returns
to a jar with this fix, the data will be restored.

diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
index 298b5abbc792dd33be38acbd1c572c9778c4d2d2..46226dd2d16a9f4017661712fe2bfc0c46f63cb2 100644
--- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
+++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
@@ -20,8 +20,12 @@ import java.nio.file.LinkOption;
 import java.nio.file.Path;
 import java.nio.file.StandardCopyOption;
 import java.nio.file.StandardOpenOption;
+import java.util.zip.InflaterInputStream; // Paper
+
 import javax.annotation.Nullable;
 import net.minecraft.Util;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtIo;
 import net.minecraft.world.level.ChunkPos;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -48,6 +52,7 @@ public class RegionFile implements AutoCloseable {
     @VisibleForTesting
     protected final RegionBitmap usedSectors;
     public final java.util.concurrent.locks.ReentrantLock fileLock = new java.util.concurrent.locks.ReentrantLock(true); // Paper
+    public final File regionFile; // Paper
 
     public RegionFile(File file, File directory, boolean dsync) throws IOException {
         this(file.toPath(), directory.toPath(), RegionFileVersion.VERSION_DEFLATE, dsync);
@@ -55,6 +60,8 @@ public class RegionFile implements AutoCloseable {
 
     public RegionFile(Path file, Path directory, RegionFileVersion outputChunkStreamVersion, boolean dsync) throws IOException {
         this.header = ByteBuffer.allocateDirect(8192);
+        this.regionFile = file.toFile(); // Paper
+        initOversizedState(); // Paper
         this.usedSectors = new RegionBitmap();
         this.version = outputChunkStreamVersion;
         if (!Files.isDirectory(directory, new LinkOption[0])) {
@@ -433,6 +440,74 @@ public class RegionFile implements AutoCloseable {
 
     }
 
+    // Paper start
+    private final byte[] oversized = new byte[1024];
+    private int oversizedCount = 0;
+
+    private synchronized void initOversizedState() throws IOException {
+        File metaFile = getOversizedMetaFile();
+        if (metaFile.exists()) {
+            final byte[] read = java.nio.file.Files.readAllBytes(metaFile.toPath());
+            System.arraycopy(read, 0, oversized, 0, oversized.length);
+            for (byte temp : oversized) {
+                oversizedCount += temp;
+            }
+        }
+    }
+
+    private static int getChunkIndex(int x, int z) {
+        return (x & 31) + (z & 31) * 32;
+    }
+    synchronized boolean isOversized(int x, int z) {
+        return this.oversized[getChunkIndex(x, z)] == 1;
+    }
+    synchronized void setOversized(int x, int z, boolean oversized) throws IOException {
+        final int offset = getChunkIndex(x, z);
+        boolean previous = this.oversized[offset] == 1;
+        this.oversized[offset] = (byte) (oversized ? 1 : 0);
+        if (!previous && oversized) {
+            oversizedCount++;
+        } else if (!oversized && previous) {
+            oversizedCount--;
+        }
+        if (previous && !oversized) {
+            File oversizedFile = getOversizedFile(x, z);
+            if (oversizedFile.exists()) {
+                oversizedFile.delete();
+            }
+        }
+        if (oversizedCount > 0) {
+            if (previous != oversized) {
+                writeOversizedMeta();
+            }
+        } else if (previous) {
+            File oversizedMetaFile = getOversizedMetaFile();
+            if (oversizedMetaFile.exists()) {
+                oversizedMetaFile.delete();
+            }
+        }
+    }
+
+    private void writeOversizedMeta() throws IOException {
+        java.nio.file.Files.write(getOversizedMetaFile().toPath(), oversized);
+    }
+
+    private File getOversizedMetaFile() {
+        return new File(this.regionFile.getParentFile(), this.regionFile.getName().replaceAll("\\.mca$", "") + ".oversized.nbt");
+    }
+
+    private File getOversizedFile(int x, int z) {
+        return new File(this.regionFile.getParentFile(), this.regionFile.getName().replaceAll("\\.mca$", "") + "_oversized_" + x + "_" + z + ".nbt");
+    }
+
+    synchronized CompoundTag getOversizedData(int x, int z) throws IOException {
+        File file = getOversizedFile(x, z);
+        try (DataInputStream out = new DataInputStream(new BufferedInputStream(new InflaterInputStream(new java.io.FileInputStream(file))))) {
+            return NbtIo.read((java.io.DataInput) out);
+        }
+
+    }
+    // Paper end
     private class ChunkBuffer extends ByteArrayOutputStream {
 
         private final ChunkPos pos;
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 ebb1a050beab9530942c4498335f084c89faef06..24092d3d3d234b6f1f2b90e22d90f297532358cc 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
@@ -10,7 +10,9 @@ import java.io.File;
 import java.io.IOException;
 import javax.annotation.Nullable;
 import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.ListTag;
 import net.minecraft.nbt.NbtIo;
+import net.minecraft.nbt.Tag;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.util.ExceptionCollector;
 import net.minecraft.world.level.ChunkPos;
@@ -81,6 +83,74 @@ public class RegionFileStorage implements AutoCloseable {
         }
     }
 
+    // Paper start
+    private static void printOversizedLog(String msg, File file, int x, int z) {
+        org.apache.logging.log4j.LogManager.getLogger().fatal(msg + " (" + file.toString().replaceAll(".+[\\\\/]", "") + " - " + x + "," + z + ") Go clean it up to remove this message. /minecraft:tp " + (x<<4)+" 128 "+(z<<4) + " - DO NOT REPORT THIS TO PAPER - You may ask for help on Discord, but do not file an issue. These error messages can not be removed.");
+    }
+
+    private static final int DEFAULT_SIZE_THRESHOLD = 1024 * 8;
+    private static final int OVERZEALOUS_TOTAL_THRESHOLD = 1024 * 64;
+    private static final int OVERZEALOUS_THRESHOLD = 1024;
+    private static int SIZE_THRESHOLD = DEFAULT_SIZE_THRESHOLD;
+    private static void resetFilterThresholds() {
+        SIZE_THRESHOLD = Math.max(1024 * 4, Integer.getInteger("Paper.FilterThreshhold", DEFAULT_SIZE_THRESHOLD));
+    }
+    static {
+        resetFilterThresholds();
+    }
+
+    static boolean isOverzealous() {
+        return SIZE_THRESHOLD == OVERZEALOUS_THRESHOLD;
+    }
+
+
+    private static CompoundTag readOversizedChunk(RegionFile regionfile, ChunkPos chunkCoordinate) throws IOException {
+        synchronized (regionfile) {
+            try (DataInputStream datainputstream = regionfile.getChunkDataInputStream(chunkCoordinate)) {
+                CompoundTag oversizedData = regionfile.getOversizedData(chunkCoordinate.x, chunkCoordinate.z);
+                CompoundTag chunk = NbtIo.read((DataInput) datainputstream);
+                if (oversizedData == null) {
+                    return chunk;
+                }
+                CompoundTag oversizedLevel = oversizedData.getCompound("Level");
+                CompoundTag level = chunk.getCompound("Level");
+
+                mergeChunkList(level, oversizedLevel, "Entities");
+                mergeChunkList(level, oversizedLevel, "TileEntities");
+
+                chunk.put("Level", level);
+
+                return chunk;
+            } catch (Throwable throwable) {
+                throwable.printStackTrace();
+                throw throwable;
+            }
+        }
+    }
+
+    private static void mergeChunkList(CompoundTag level, CompoundTag oversizedLevel, String key) {
+        ListTag levelList = level.getList(key, 10);
+        ListTag oversizedList = oversizedLevel.getList(key, 10);
+
+        if (!oversizedList.isEmpty()) {
+            levelList.addAll(oversizedList);
+            level.put(key, levelList);
+        }
+    }
+
+    private static int getNBTSize(Tag nbtBase) {
+        DataOutputStream test = new DataOutputStream(new org.apache.commons.io.output.NullOutputStream());
+        try {
+            nbtBase.write(test);
+            return test.size();
+        } catch (IOException e) {
+            e.printStackTrace();
+            return 0;
+        }
+    }
+
+    // Paper End
+
     @Nullable
     public CompoundTag read(ChunkPos pos) throws IOException {
         // CraftBukkit start - SPIGOT-5680: There's no good reason to preemptively create files on read, save that for writing
@@ -92,6 +162,12 @@ public class RegionFileStorage implements AutoCloseable {
         try { // Paper
         DataInputStream datainputstream = regionfile.getChunkDataInputStream(pos);
 
+        // Paper start
+        if (regionfile.isOversized(pos.x, pos.z)) {
+            printOversizedLog("Loading Oversized Chunk!", regionfile.regionFile, pos.x, pos.z);
+            return readOversizedChunk(regionfile, pos);
+        }
+        // Paper end
         CompoundTag nbttagcompound;
         label43:
         {
@@ -143,6 +219,7 @@ public class RegionFileStorage implements AutoCloseable {
 
             try {
                 NbtIo.write(nbt, (DataOutput) dataoutputstream);
+                regionfile.setOversized(pos.x, pos.z, false); // Paper - We don't do this anymore, mojang stores differently, but clear old meta flag if it exists to get rid of our own meta file once last oversized is gone
             } catch (Throwable throwable) {
                 if (dataoutputstream != null) {
                     try {