Add disallowed-blocks, log-large-block-buffer-changes and block-buffer-rate-limit config options

build.gradle.kts

@@ -1,7 +1,7 @@
 plugins {
     `java-library`
-    id("io.papermc.paperweight.userdev") version "1.5.8"
-    id("xyz.jpenilla.run-paper") version "2.2.0" // Adds runServer and runMojangMappedServer tasks for testing
+    id("io.papermc.paperweight.userdev") version "1.5.11"
+    id("xyz.jpenilla.run-paper") version "2.2.2" // Adds runServer and runMojangMappedServer tasks for testing
 
     // Shades and relocates dependencies into our plugin jar. See https://imperceptiblethoughts.com/shadow/introduction/
     id("com.github.johnrengelman.shadow") version "8.1.1"
@@ -20,8 +20,8 @@ repositories {
     mavenCentral()
     maven("https://s01.oss.sonatype.org/content/repositories/snapshots/")
     maven("https://jitpack.io")
-    maven("https://maven.enginehub.org/repo/")
     maven("https://repo.papermc.io/repository/maven-public/")
+    maven("https://maven.enginehub.org/repo/")
 }
 
 dependencies {

src/main/java/com/moulberry/axiom/AxiomPaper.java

@@ -1,5 +1,8 @@
 package com.moulberry.axiom;
 
+import com.google.common.util.concurrent.RateLimiter;
+import com.mojang.brigadier.StringReader;
+import com.moulberry.axiom.buffer.BlockBuffer;
 import com.moulberry.axiom.buffer.CompressedBlockEntity;
 import com.moulberry.axiom.event.AxiomCreateWorldPropertiesEvent;
 import com.moulberry.axiom.event.AxiomModifyWorldEvent;
@@ -12,6 +15,11 @@ import io.papermc.paper.event.world.WorldGameRuleChangeEvent;
 import io.papermc.paper.network.ChannelInitializeListener;
 import io.papermc.paper.network.ChannelInitializeListenerHolder;
 import net.kyori.adventure.key.Key;
+import net.minecraft.commands.arguments.blocks.BlockPredicateArgument;
+import net.minecraft.commands.arguments.blocks.BlockStateArgument;
+import net.minecraft.commands.arguments.blocks.BlockStateParser;
+import net.minecraft.core.IdMapper;
+import net.minecraft.core.registries.BuiltInRegistries;
 import net.minecraft.network.Connection;
 import net.minecraft.network.ConnectionProtocol;
 import net.minecraft.network.FriendlyByteBuf;
@@ -19,6 +27,9 @@ import net.minecraft.network.protocol.Packet;
 import net.minecraft.network.protocol.PacketFlow;
 import net.minecraft.network.protocol.common.ServerboundCustomPayloadPacket;
 import net.minecraft.server.MinecraftServer;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.level.block.state.BlockState;
 import org.bukkit.*;
 import org.bukkit.configuration.Configuration;
 import org.bukkit.entity.Player;
@@ -32,14 +43,20 @@ import org.jetbrains.annotations.Nullable;
 
 import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Level;
 
 public class AxiomPaper extends JavaPlugin implements Listener {
 
     public static AxiomPaper PLUGIN; // tsk tsk tsk
 
     public final Set<UUID> activeAxiomPlayers = Collections.newSetFromMap(new ConcurrentHashMap<>());
+    public final Map<UUID, RateLimiter> playerBlockBufferRateLimiters = new ConcurrentHashMap<>();
     public Configuration configuration;
 
+    public IdMapper<BlockState> allowedBlockRegistry = null;
+    private boolean logLargeBlockBufferChanges = false;
+
     @Override
     public void onEnable() {
         PLUGIN = this;
@@ -55,6 +72,11 @@ public class AxiomPaper extends JavaPlugin implements Listener {
             this.getLogger().warning("Invalid value for unsupported-axiom-version, expected 'kick', 'warn' or 'ignore'");
         }
 
+        this.logLargeBlockBufferChanges = this.configuration.getBoolean("log-large-block-buffer-changes");
+
+        List<String> disallowedBlocks = this.configuration.getStringList("disallowed-blocks");
+        this.allowedBlockRegistry = DisallowedBlocks.createAllowedBlockRegistry(disallowedBlocks);
+
         Bukkit.getPluginManager().registerEvents(this, this);
         // Bukkit.getPluginManager().registerEvents(new WorldPropertiesExample(), this);
         CompressedBlockEntity.initialize(this);
@@ -70,7 +92,7 @@ public class AxiomPaper extends JavaPlugin implements Listener {
         msg.registerOutgoingPluginChannel(this, "axiom:ack_world_properties");
 
         if (configuration.getBoolean("packet-handlers.hello")) {
-            msg.registerIncomingPluginChannel(this, "axiom:hello", new HelloPacketListener(this, activeAxiomPlayers));
+            msg.registerIncomingPluginChannel(this, "axiom:hello", new HelloPacketListener(this));
         }
         if (configuration.getBoolean("packet-handlers.set-gamemode")) {
             msg.registerIncomingPluginChannel(this, "axiom:set_gamemode", new SetGamemodePacketListener(this));
@@ -129,7 +151,7 @@ public class AxiomPaper extends JavaPlugin implements Listener {
         }
 
         Bukkit.getScheduler().scheduleSyncRepeatingTask(this, () -> {
-            HashSet<UUID> newActiveAxiomPlayers = new HashSet<>();
+            HashSet<UUID> stillActiveAxiomPlayers = new HashSet<>();
 
             for (Player player : Bukkit.getServer().getOnlinePlayers()) {
                 if (activeAxiomPlayers.contains(player.getUniqueId())) {
@@ -140,13 +162,13 @@ public class AxiomPaper extends JavaPlugin implements Listener {
                         buf.getBytes(0, bytes);
                         player.sendPluginMessage(this, "axiom:enable", bytes);
                     } else {
-                        newActiveAxiomPlayers.add(player.getUniqueId());
+                        stillActiveAxiomPlayers.add(player.getUniqueId());
                     }
                 }
             }
 
-            activeAxiomPlayers.clear();
-            activeAxiomPlayers.addAll(newActiveAxiomPlayers);
+            activeAxiomPlayers.retainAll(stillActiveAxiomPlayers);
+            playerBlockBufferRateLimiters.keySet().retainAll(stillActiveAxiomPlayers);
         }, 20, 20);
 
         int maxChunkRelightsPerTick = configuration.getInt("max-chunk-relights-per-tick");
@@ -157,10 +179,18 @@ public class AxiomPaper extends JavaPlugin implements Listener {
         }, 1, 1);
     }
 
+    public boolean logLargeBlockBufferChanges() {
+        return this.logLargeBlockBufferChanges;
+    }
+
     public boolean canUseAxiom(Player player) {
         return player.hasPermission("axiom.*") && activeAxiomPlayers.contains(player.getUniqueId());
     }
 
+    public @Nullable RateLimiter getBlockBufferRateLimiter(UUID uuid) {
+        return this.playerBlockBufferRateLimiters.get(uuid);
+    }
+
     private final WeakHashMap<World, ServerWorldPropertiesRegistry> worldProperties = new WeakHashMap<>();
 
     public @Nullable ServerWorldPropertiesRegistry getWorldPropertiesIfPresent(World world) {

src/main/java/com/moulberry/axiom/DisallowedBlocks.java

@@ -0,0 +1,92 @@
+package com.moulberry.axiom;
+
+import com.mojang.brigadier.StringReader;
+import com.mojang.datafixers.util.Either;
+import com.moulberry.axiom.buffer.BlockBuffer;
+import net.minecraft.commands.arguments.blocks.BlockPredicateArgument;
+import net.minecraft.commands.arguments.blocks.BlockStateParser;
+import net.minecraft.core.IdMapper;
+import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.nbt.NbtUtils;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.block.state.properties.Property;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Predicate;
+
+public class DisallowedBlocks {
+
+    public static IdMapper<BlockState> createAllowedBlockRegistry(List<String> disallowedBlocks) {
+        List<Predicate<BlockState>> disallowedPredicates = new ArrayList<>();
+
+        for (String disallowedBlock : disallowedBlocks) {
+            try {
+                var parsed = BlockStateParser.parseForTesting(BuiltInRegistries.BLOCK.asLookup(), new StringReader(disallowedBlock), false);
+
+                parsed.left().ifPresent(result -> {
+                    disallowedPredicates.add(blockState -> {
+                        if (!blockState.is(result.blockState().getBlock())) {
+                            return false;
+                        } else {
+                            for (Property<?> property : result.properties().keySet()) {
+                                if (blockState.getValue(property) != result.blockState().getValue(property)) {
+                                    return false;
+                                }
+                            }
+                            return true;
+                        }
+                    });
+                });
+
+                parsed.right().ifPresent(result -> {
+                    disallowedPredicates.add(blockState -> {
+                        if (!blockState.is(result.tag())) {
+                            return false;
+                        } else {
+                            for(Map.Entry<String, String> entry : result.vagueProperties().entrySet()) {
+                                Property<?> property = blockState.getBlock().getStateDefinition().getProperty(entry.getKey());
+                                if (property == null) {
+                                    return false;
+                                }
+
+                                Comparable<?> comparable = property.getValue(entry.getValue()).orElse(null);
+                                if (comparable == null) {
+                                    return false;
+                                }
+
+                                if (blockState.getValue(property) != comparable) {
+                                    return false;
+                                }
+                            }
+
+                            return true;
+                        }
+                    });
+                });
+            } catch (Exception ignored) {}
+        }
+
+        IdMapper<BlockState> allowedBlockRegistry = new IdMapper<>();
+
+        // Create allowedBlockRegistry
+        blocks:
+        for (BlockState blockState : Block.BLOCK_STATE_REGISTRY) {
+            for (Predicate<BlockState> disallowedPredicate : disallowedPredicates) {
+                if (disallowedPredicate.test(blockState)) {
+                    allowedBlockRegistry.add(BlockBuffer.EMPTY_STATE);
+                    continue blocks;
+                }
+            }
+
+            allowedBlockRegistry.add(blockState);
+        }
+        allowedBlockRegistry.addMapping(BlockBuffer.EMPTY_STATE, Block.BLOCK_STATE_REGISTRY.getId(BlockBuffer.EMPTY_STATE));
+        return allowedBlockRegistry;
+    }
+
+}

src/main/java/com/moulberry/axiom/buffer/BiomeBuffer.java

@@ -1,11 +1,15 @@
 package com.moulberry.axiom.buffer;
 
+import com.google.common.util.concurrent.RateLimiter;
 import it.unimi.dsi.fastutil.objects.Object2ByteMap;
 import it.unimi.dsi.fastutil.objects.Object2ByteOpenHashMap;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.world.level.biome.Biome;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.concurrent.atomic.AtomicBoolean;
 
 public class BiomeBuffer {
 
@@ -27,6 +31,10 @@ public class BiomeBuffer {
         this.paletteSize = this.paletteReverse.size();
     }
 
+    public int size() {
+        return this.map.size();
+    }
+
     public void save(FriendlyByteBuf friendlyByteBuf) {
         friendlyByteBuf.writeByte(this.paletteSize);
         for (int i = 0; i < this.paletteSize; i++) {
@@ -35,7 +43,7 @@ public class BiomeBuffer {
         this.map.save(friendlyByteBuf);
     }
 
-    public static BiomeBuffer load(FriendlyByteBuf friendlyByteBuf) {
+    public static BiomeBuffer load(FriendlyByteBuf friendlyByteBuf, @Nullable RateLimiter rateLimiter, AtomicBoolean reachedRateLimit) {
         int paletteSize = friendlyByteBuf.readByte();
         ResourceKey<Biome>[] palette = new ResourceKey[255];
         Object2ByteMap<ResourceKey<Biome>> paletteReverse = new Object2ByteOpenHashMap<>();
@@ -44,7 +52,7 @@ public class BiomeBuffer {
             palette[i] = key;
             paletteReverse.put(key, (byte)(i+1));
         }
-        Position2ByteMap map = Position2ByteMap.load(friendlyByteBuf);
+        Position2ByteMap map = Position2ByteMap.load(friendlyByteBuf, rateLimiter, reachedRateLimit);
         return new BiomeBuffer(map, palette, paletteReverse);
 
     }

src/main/java/com/moulberry/axiom/buffer/BlockBuffer.java

@@ -1,5 +1,6 @@
 package com.moulberry.axiom.buffer;
 
+import com.google.common.util.concurrent.RateLimiter;
 import com.moulberry.axiom.AxiomConstants;
 import com.moulberry.axiom.AxiomPaper;
 import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
@@ -15,6 +16,8 @@ import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.chunk.PalettedContainer;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.concurrent.atomic.AtomicBoolean;
+
 public class BlockBuffer {
 
     public static final BlockState EMPTY_STATE = Blocks.STRUCTURE_VOID.defaultBlockState();
@@ -24,6 +27,8 @@ public class BlockBuffer {
     private PalettedContainer<BlockState> last = null;
     private long lastId = AxiomConstants.MIN_POSITION_LONG;
     private final Long2ObjectMap<Short2ObjectMap<CompressedBlockEntity>> blockEntities = new Long2ObjectOpenHashMap<>();
+    private long totalBlockEntities = 0;
+    private long totalBlockEntityBytes = 0;
 
     public BlockBuffer() {
         this.values = new Long2ObjectOpenHashMap<>();
@@ -53,54 +58,57 @@ public class BlockBuffer {
         friendlyByteBuf.writeLong(AxiomConstants.MIN_POSITION_LONG);
     }
 
-    public static BlockBuffer load(FriendlyByteBuf friendlyByteBuf) {
+    public static BlockBuffer load(FriendlyByteBuf friendlyByteBuf, @Nullable RateLimiter rateLimiter, AtomicBoolean reachedRateLimit) {
         BlockBuffer buffer = new BlockBuffer();
 
+        long totalBlockEntities = 0;
+        long totalBlockEntityBytes = 0;
+
         while (true) {
             long index = friendlyByteBuf.readLong();
             if (index == AxiomConstants.MIN_POSITION_LONG) break;
 
+            if (rateLimiter != null) {
+                if (!rateLimiter.tryAcquire()) {
+                    reachedRateLimit.set(true);
+                    buffer.totalBlockEntities = totalBlockEntities;
+                    buffer.totalBlockEntityBytes = totalBlockEntityBytes;
+                    return buffer;
+                }
+            }
+
             PalettedContainer<BlockState> palettedContainer = buffer.getOrCreateSection(index);
             palettedContainer.read(friendlyByteBuf);
 
             int blockEntitySize = Math.min(4096, friendlyByteBuf.readVarInt());
             if (blockEntitySize > 0) {
                 Short2ObjectMap<CompressedBlockEntity> map = new Short2ObjectOpenHashMap<>(blockEntitySize);
+
+                int startIndex = friendlyByteBuf.readerIndex();
+
                 for (int i = 0; i < blockEntitySize; i++) {
                     short offset = friendlyByteBuf.readShort();
                     CompressedBlockEntity blockEntity = CompressedBlockEntity.read(friendlyByteBuf);
                     map.put(offset, blockEntity);
                 }
+
                 buffer.blockEntities.put(index, map);
+                totalBlockEntities += blockEntitySize;
+                totalBlockEntityBytes += friendlyByteBuf.readerIndex() - startIndex;
             }
         }
 
+        buffer.totalBlockEntities = totalBlockEntities;
+        buffer.totalBlockEntityBytes = totalBlockEntityBytes;
         return buffer;
     }
 
-    public void clear() {
-        this.last = null;
-        this.lastId = AxiomConstants.MIN_POSITION_LONG;
-        this.values.clear();
+    public long getTotalBlockEntities() {
+        return this.totalBlockEntities;
     }
 
-    public void putBlockEntity(int x, int y, int z, CompressedBlockEntity blockEntity) {
-        long cpos = BlockPos.asLong(x >> 4, y >> 4, z >> 4);
-        Short2ObjectMap<CompressedBlockEntity> chunkMap = this.blockEntities.computeIfAbsent(cpos, k -> new Short2ObjectOpenHashMap<>());
-
-        int key = (x & 0xF) | ((y & 0xF) << 4) | ((z & 0xF) << 8);
-        chunkMap.put((short)key, blockEntity);
-    }
-
-    @Nullable
-    public CompressedBlockEntity getBlockEntity(int x, int y, int z) {
-        long cpos = BlockPos.asLong(x >> 4, y >> 4, z >> 4);
-        Short2ObjectMap<CompressedBlockEntity> chunkMap = this.blockEntities.get(cpos);
-
-        if (chunkMap == null) return null;
-
-        int key = (x & 0xF) | ((y & 0xF) << 4) | ((z & 0xF) << 8);
-        return chunkMap.get((short)key);
+    public long getTotalBlockEntityBytes() {
+        return this.totalBlockEntityBytes;
     }
 
     @Nullable
@@ -170,7 +178,7 @@ public class BlockBuffer {
     public PalettedContainer<BlockState> getOrCreateSection(long id) {
         if (this.last == null || id != this.lastId) {
             this.lastId = id;
-            this.last = this.values.computeIfAbsent(id, k -> new PalettedContainer<>(Block.BLOCK_STATE_REGISTRY,
+            this.last = this.values.computeIfAbsent(id, k -> new PalettedContainer<>(AxiomPaper.PLUGIN.allowedBlockRegistry,
                              EMPTY_STATE, PalettedContainer.Strategy.SECTION_STATES));
         }
 

src/main/java/com/moulberry/axiom/buffer/CompressedBlockEntity.java

@@ -5,6 +5,7 @@ import com.github.luben.zstd.ZstdDictCompress;
 import com.github.luben.zstd.ZstdDictDecompress;
 import com.moulberry.axiom.AxiomPaper;
 import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtAccounter;
 import net.minecraft.nbt.NbtIo;
 import net.minecraft.network.FriendlyByteBuf;
 
@@ -44,7 +45,7 @@ public record CompressedBlockEntity(int originalSize, byte compressionDict, byte
 
         try {
             byte[] nbt = Zstd.decompress(this.compressed, zstdDictDecompress, this.originalSize);
-            return NbtIo.read(new DataInputStream(new ByteArrayInputStream(nbt)));
+            return NbtIo.read(new DataInputStream(new ByteArrayInputStream(nbt)), NbtAccounter.create(131072));
         } catch (IOException e) {
             throw new RuntimeException(e);
         }

src/main/java/com/moulberry/axiom/buffer/Position2ByteMap.java

@@ -1,13 +1,16 @@
 package com.moulberry.axiom.buffer;
 
+import com.google.common.util.concurrent.RateLimiter;
 import com.moulberry.axiom.AxiomConstants;
 import com.moulberry.axiom.AxiomPaper;
 import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
 import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
 import net.minecraft.core.BlockPos;
 import net.minecraft.network.FriendlyByteBuf;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.function.LongFunction;
 
 public class Position2ByteMap {
@@ -42,6 +45,10 @@ public class Position2ByteMap {
         }
     }
 
+    public int size() {
+        return this.map.size();
+    }
+
     public void save(FriendlyByteBuf friendlyByteBuf) {
         friendlyByteBuf.writeByte(this.defaultValue);
         for (Long2ObjectMap.Entry<byte[]> entry : this.map.long2ObjectEntrySet()) {
@@ -51,13 +58,20 @@ public class Position2ByteMap {
         friendlyByteBuf.writeLong(AxiomConstants.MIN_POSITION_LONG);
     }
 
-    public static Position2ByteMap load(FriendlyByteBuf friendlyByteBuf) {
+    public static Position2ByteMap load(FriendlyByteBuf friendlyByteBuf, @Nullable RateLimiter rateLimiter, AtomicBoolean reachedRateLimit) {
         Position2ByteMap map = new Position2ByteMap(friendlyByteBuf.readByte());
 
         while (true) {
             long pos = friendlyByteBuf.readLong();
             if (pos == AxiomConstants.MIN_POSITION_LONG) break;
 
+            if (rateLimiter != null) {
+                if (!rateLimiter.tryAcquire()) {
+                    reachedRateLimit.set(true);
+                    return map;
+                }
+            }
+
             byte[] bytes = new byte[16*16*16];
             friendlyByteBuf.readBytes(bytes);
             map.map.put(pos, bytes);

src/main/java/com/moulberry/axiom/packet/AxiomBigPayloadHandler.java

@@ -47,6 +47,7 @@ public class AxiomBigPayloadHandler extends ByteToMessageDecoder {
                         if (player != null && player.getBukkitEntity().hasPermission("axiom.*")) {
                             if (listener.onReceive(player, buf)) {
                                 success = true;
+                                in.skipBytes(in.readableBytes());
                                 return;
                             }
                         }

src/main/java/com/moulberry/axiom/packet/HelloPacketListener.java

@@ -1,5 +1,6 @@
 package com.moulberry.axiom.packet;
 
+import com.google.common.util.concurrent.RateLimiter;
 import com.moulberry.axiom.AxiomConstants;
 import com.moulberry.axiom.AxiomPaper;
 import com.moulberry.axiom.View;
@@ -29,11 +30,9 @@ import java.util.UUID;
 public class HelloPacketListener implements PluginMessageListener {
 
     private final AxiomPaper plugin;
-    private final Set<UUID> activeAxiomPlayers;
 
-    public HelloPacketListener(AxiomPaper plugin, Set<UUID> activeAxiomPlayers) {
+    public HelloPacketListener(AxiomPaper plugin) {
         this.plugin = plugin;
-        this.activeAxiomPlayers = activeAxiomPlayers;
     }
 
     @Override
@@ -86,7 +85,11 @@ public class HelloPacketListener implements PluginMessageListener {
             return;
         }
 
-        activeAxiomPlayers.add(player.getUniqueId());
+        this.plugin.activeAxiomPlayers.add(player.getUniqueId());
+        int rateLimit = this.plugin.configuration.getInt("block-buffer-rate-limit");
+        if (rateLimit > 0) {
+            this.plugin.playerBlockBufferRateLimiters.putIfAbsent(player.getUniqueId(), RateLimiter.create(rateLimit));
+        }
 
         // Enable
         FriendlyByteBuf buf = new FriendlyByteBuf(Unpooled.buffer());

src/main/java/com/moulberry/axiom/packet/SetBlockBufferPacketListener.java

@@ -1,5 +1,6 @@
 package com.moulberry.axiom.packet;
 
+import com.google.common.util.concurrent.RateLimiter;
 import com.moulberry.axiom.AxiomPaper;
 import com.moulberry.axiom.WorldExtension;
 import com.moulberry.axiom.buffer.BiomeBuffer;
@@ -10,12 +11,14 @@ import com.moulberry.axiom.integration.SectionPermissionChecker;
 import com.moulberry.axiom.integration.plotsquared.PlotSquaredIntegration;
 import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
 import it.unimi.dsi.fastutil.shorts.Short2ObjectMap;
+import net.minecraft.ChatFormatting;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Holder;
 import net.minecraft.core.Registry;
 import net.minecraft.core.SectionPos;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.network.chat.Component;
 import net.minecraft.network.protocol.game.ClientboundChunksBiomesPacket;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.server.MinecraftServer;
@@ -36,18 +39,19 @@ import net.minecraft.world.level.chunk.LevelChunkSection;
 import net.minecraft.world.level.chunk.PalettedContainer;
 import net.minecraft.world.level.levelgen.Heightmap;
 import net.minecraft.world.level.lighting.LightEngine;
-import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import xyz.jpenilla.reflectionremapper.ReflectionRemapper;
 
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.*;
+import java.util.concurrent.atomic.AtomicBoolean;
 
 public class SetBlockBufferPacketListener {
 
     private final AxiomPaper plugin;
     private final Method updateBlockEntityTicker;
+    private final WeakHashMap<ServerPlayer, RateLimiter> packetRateLimiter = new WeakHashMap<>();
 
     public SetBlockBufferPacketListener(AxiomPaper plugin) {
         this.plugin = plugin;
@@ -76,12 +80,38 @@ public class SetBlockBufferPacketListener {
             friendlyByteBuf.readNbt(); // Discard sourceInfo
         }
 
+        RateLimiter rateLimiter = this.plugin.getBlockBufferRateLimiter(player.getUUID());
+
         byte type = friendlyByteBuf.readByte();
         if (type == 0) {
-            BlockBuffer buffer = BlockBuffer.load(friendlyByteBuf);
+            AtomicBoolean reachedRateLimit = new AtomicBoolean(false);
+            BlockBuffer buffer = BlockBuffer.load(friendlyByteBuf, rateLimiter, reachedRateLimit);
+            if (reachedRateLimit.get()) {
+                player.sendSystemMessage(Component.literal("[Axiom] Exceeded server rate-limit of " + (int)rateLimiter.getRate() + " sections per second")
+                    .withStyle(ChatFormatting.RED));
+            }
+
+            if (this.plugin.logLargeBlockBufferChanges()) {
+                this.plugin.getLogger().info("Player " + player.getUUID() + " modified " + buffer.entrySet().size() + " chunk sections (blocks)");
+                if (buffer.getTotalBlockEntities() > 0) {
+                    this.plugin.getLogger().info("Player " + player.getUUID() + " modified " + buffer.getTotalBlockEntities() + " block entities, compressed bytes = " +
+                        buffer.getTotalBlockEntityBytes());
+                }
+            }
+
             applyBlockBuffer(player, server, buffer, worldKey);
         } else if (type == 1) {
-            BiomeBuffer buffer = BiomeBuffer.load(friendlyByteBuf);
+            AtomicBoolean reachedRateLimit = new AtomicBoolean(false);
+            BiomeBuffer buffer = BiomeBuffer.load(friendlyByteBuf, rateLimiter, reachedRateLimit);
+            if (reachedRateLimit.get()) {
+                player.sendSystemMessage(Component.literal("[Axiom] Exceeded server rate-limit of " + (int)rateLimiter.getRate() + " sections per second")
+                                                  .withStyle(ChatFormatting.RED));
+            }
+
+            if (this.plugin.logLargeBlockBufferChanges()) {
+                this.plugin.getLogger().info("Player " + player.getUUID() + " modified " + buffer.size() + " chunk sections (biomes)");
+            }
+
             applyBiomeBuffer(player, server, buffer, worldKey);
         } else {
             throw new RuntimeException("Unknown buffer type: " + type);
@@ -92,245 +122,252 @@ public class SetBlockBufferPacketListener {
 
     private void applyBlockBuffer(ServerPlayer player, MinecraftServer server, BlockBuffer buffer, ResourceKey<Level> worldKey) {
         server.execute(() -> {
-            ServerLevel world = player.serverLevel();
-            if (!world.dimension().equals(worldKey)) return;
+            try {
+                ServerLevel world = player.serverLevel();
+                if (!world.dimension().equals(worldKey)) return;
 
-            if (!this.plugin.canUseAxiom(player.getBukkitEntity())) {
-                return;
-            }
-
-            if (!this.plugin.canModifyWorld(player.getBukkitEntity(), world.getWorld())) {
-                return;
-            }
-
-            // Allowed, apply buffer
-            BlockPos.MutableBlockPos blockPos = new BlockPos.MutableBlockPos();
-            WorldExtension extension = WorldExtension.get(world);
-
-            BlockState emptyState = BlockBuffer.EMPTY_STATE;
-
-            for (Long2ObjectMap.Entry<PalettedContainer<BlockState>> entry : buffer.entrySet()) {
-                int cx = BlockPos.getX(entry.getLongKey());
-                int cy = BlockPos.getY(entry.getLongKey());
-                int cz = BlockPos.getZ(entry.getLongKey());
-                PalettedContainer<BlockState> container = entry.getValue();
-
-                if (cy < world.getMinSection() || cy >= world.getMaxSection()) {
-                    continue;
+                if (!this.plugin.canUseAxiom(player.getBukkitEntity())) {
+                    return;
                 }
 
-                SectionPermissionChecker checker = PlotSquaredIntegration.checkSection(player.getBukkitEntity(), world.getWorld(), cx, cy, cz);
-                if (checker != null && checker.noneAllowed()) {
-                    continue;
+                if (!this.plugin.canModifyWorld(player.getBukkitEntity(), world.getWorld())) {
+                    return;
                 }
 
-                LevelChunk chunk = world.getChunk(cx, cz);
+                // Allowed, apply buffer
+                BlockPos.MutableBlockPos blockPos = new BlockPos.MutableBlockPos();
+                WorldExtension extension = WorldExtension.get(world);
 
-                LevelChunkSection section = chunk.getSection(world.getSectionIndexFromSectionY(cy));
-                PalettedContainer<BlockState> sectionStates = section.getStates();
-                boolean hasOnlyAir = section.hasOnlyAir();
+                BlockState emptyState = BlockBuffer.EMPTY_STATE;
 
-                Heightmap worldSurface = null;
-                Heightmap oceanFloor = null;
-                Heightmap motionBlocking = null;
-                Heightmap motionBlockingNoLeaves = null;
-                for (Map.Entry<Heightmap.Types, Heightmap> heightmap : chunk.getHeightmaps()) {
-                    switch (heightmap.getKey()) {
-                        case WORLD_SURFACE -> worldSurface = heightmap.getValue();
-                        case OCEAN_FLOOR -> oceanFloor = heightmap.getValue();
-                        case MOTION_BLOCKING -> motionBlocking = heightmap.getValue();
-                        case MOTION_BLOCKING_NO_LEAVES -> motionBlockingNoLeaves = heightmap.getValue();
-                        default -> {}
+                for (Long2ObjectMap.Entry<PalettedContainer<BlockState>> entry : buffer.entrySet()) {
+                    int cx = BlockPos.getX(entry.getLongKey());
+                    int cy = BlockPos.getY(entry.getLongKey());
+                    int cz = BlockPos.getZ(entry.getLongKey());
+                    PalettedContainer<BlockState> container = entry.getValue();
+
+                    if (cy < world.getMinSection() || cy >= world.getMaxSection()) {
+                        continue;
                     }
-                }
 
-                boolean sectionChanged = false;
-                boolean sectionLightChanged = false;
-
-                boolean containerMaybeHasPoi = container.maybeHas(PoiTypes::hasPoi);
-                boolean sectionMaybeHasPoi = section.maybeHas(PoiTypes::hasPoi);
-
-                Short2ObjectMap<CompressedBlockEntity> blockEntityChunkMap = buffer.getBlockEntityChunkMap(entry.getLongKey());
-
-                int minX = 0;
-                int minY = 0;
-                int minZ = 0;
-                int maxX = 15;
-                int maxY = 15;
-                int maxZ = 15;
-
-                if (checker != null) {
-                    minX = checker.bounds().minX();
-                    minY = checker.bounds().minY();
-                    minZ = checker.bounds().minZ();
-                    maxX = checker.bounds().maxX();
-                    maxY = checker.bounds().maxY();
-                    maxZ = checker.bounds().maxZ();
-                    if (checker.allAllowed()) {
-                        checker = null;
+                    SectionPermissionChecker checker = PlotSquaredIntegration.checkSection(player.getBukkitEntity(), world.getWorld(), cx, cy, cz);
+                    if (checker != null && checker.noneAllowed()) {
+                        continue;
                     }
-                }
 
-                for (int x = minX; x <= maxX; x++) {
-                    for (int y = minY; y <= maxY; y++) {
-                        for (int z = minZ; z <= maxZ; z++) {
-                            BlockState blockState = container.get(x, y, z);
-                            if (blockState == emptyState) continue;
+                    LevelChunk chunk = world.getChunk(cx, cz);
 
-                            int bx = cx*16 + x;
-                            int by = cy*16 + y;
-                            int bz = cz*16 + z;
+                    LevelChunkSection section = chunk.getSection(world.getSectionIndexFromSectionY(cy));
+                    PalettedContainer<BlockState> sectionStates = section.getStates();
+                    boolean hasOnlyAir = section.hasOnlyAir();
 
-                            if (hasOnlyAir && blockState.isAir()) {
-                                continue;
-                            }
+                    Heightmap worldSurface = null;
+                    Heightmap oceanFloor = null;
+                    Heightmap motionBlocking = null;
+                    Heightmap motionBlockingNoLeaves = null;
+                    for (Map.Entry<Heightmap.Types, Heightmap> heightmap : chunk.getHeightmaps()) {
+                        switch (heightmap.getKey()) {
+                            case WORLD_SURFACE -> worldSurface = heightmap.getValue();
+                            case OCEAN_FLOOR -> oceanFloor = heightmap.getValue();
+                            case MOTION_BLOCKING -> motionBlocking = heightmap.getValue();
+                            case MOTION_BLOCKING_NO_LEAVES -> motionBlockingNoLeaves = heightmap.getValue();
+                            default -> {}
+                        }
+                    }
 
-                            if (checker != null && !checker.allowed(x, y, z)) continue;
+                    boolean sectionChanged = false;
+                    boolean sectionLightChanged = false;
 
-                            BlockState old = section.setBlockState(x, y, z, blockState, true);
-                            if (blockState != old) {
-                                sectionChanged = true;
-                                blockPos.set(bx, by, bz);
+                    boolean containerMaybeHasPoi = container.maybeHas(PoiTypes::hasPoi);
+                    boolean sectionMaybeHasPoi = section.maybeHas(PoiTypes::hasPoi);
 
-                                Block block = blockState.getBlock();
-                                motionBlocking.update(x, by, z, blockState);
-                                motionBlockingNoLeaves.update(x, by, z, blockState);
-                                oceanFloor.update(x, by, z, blockState);
-                                worldSurface.update(x, by, z, blockState);
+                    Short2ObjectMap<CompressedBlockEntity> blockEntityChunkMap = buffer.getBlockEntityChunkMap(entry.getLongKey());
 
-                                if (false) { // Full update
-                                    old.onRemove(world, blockPos, blockState, false);
+                    int minX = 0;
+                    int minY = 0;
+                    int minZ = 0;
+                    int maxX = 15;
+                    int maxY = 15;
+                    int maxZ = 15;
 
-                                    if (sectionStates.get(x, y, z).is(block)) {
-                                        blockState.onPlace(world, blockPos, old, false);
-                                    }
+                    if (checker != null) {
+                        minX = checker.bounds().minX();
+                        minY = checker.bounds().minY();
+                        minZ = checker.bounds().minZ();
+                        maxX = checker.bounds().maxX();
+                        maxY = checker.bounds().maxY();
+                        maxZ = checker.bounds().maxZ();
+                        if (checker.allAllowed()) {
+                            checker = null;
+                        }
+                    }
+
+                    for (int x = minX; x <= maxX; x++) {
+                        for (int y = minY; y <= maxY; y++) {
+                            for (int z = minZ; z <= maxZ; z++) {
+                                BlockState blockState = container.get(x, y, z);
+                                if (blockState == emptyState) continue;
+
+                                int bx = cx*16 + x;
+                                int by = cy*16 + y;
+                                int bz = cz*16 + z;
+
+                                if (hasOnlyAir && blockState.isAir()) {
+                                    continue;
                                 }
 
-                                if (blockState.hasBlockEntity()) {
-                                    BlockEntity blockEntity = chunk.getBlockEntity(blockPos, LevelChunk.EntityCreationType.CHECK);
+                                if (checker != null && !checker.allowed(x, y, z)) continue;
 
-                                    if (blockEntity == null) {
-                                        // There isn't a block entity here, create it!
-                                        blockEntity = ((EntityBlock)block).newBlockEntity(blockPos, blockState);
-                                        if (blockEntity != null) {
-                                            chunk.addAndRegisterBlockEntity(blockEntity);
-                                        }
-                                    } else if (blockEntity.getType().isValid(blockState)) {
-                                        // Block entity is here and the type is correct
-                                        blockEntity.setBlockState(blockState);
+                                BlockState old = section.setBlockState(x, y, z, blockState, true);
+                                if (blockState != old) {
+                                    sectionChanged = true;
+                                    blockPos.set(bx, by, bz);
 
-                                        try {
-                                            this.updateBlockEntityTicker.invoke(chunk, blockEntity);
-                                        } catch (IllegalAccessException | InvocationTargetException e) {
-                                            throw new RuntimeException(e);
+                                    Block block = blockState.getBlock();
+                                    motionBlocking.update(x, by, z, blockState);
+                                    motionBlockingNoLeaves.update(x, by, z, blockState);
+                                    oceanFloor.update(x, by, z, blockState);
+                                    worldSurface.update(x, by, z, blockState);
+
+                                    if (false) { // Full update
+                                        old.onRemove(world, blockPos, blockState, false);
+
+                                        if (sectionStates.get(x, y, z).is(block)) {
+                                            blockState.onPlace(world, blockPos, old, false);
                                         }
-                                    } else {
-                                        // Block entity type isn't correct, we need to recreate it
+                                    }
+
+                                    if (blockState.hasBlockEntity()) {
+                                        BlockEntity blockEntity = chunk.getBlockEntity(blockPos, LevelChunk.EntityCreationType.CHECK);
+
+                                        if (blockEntity == null) {
+                                            // There isn't a block entity here, create it!
+                                            blockEntity = ((EntityBlock)block).newBlockEntity(blockPos, blockState);
+                                            if (blockEntity != null) {
+                                                chunk.addAndRegisterBlockEntity(blockEntity);
+                                            }
+                                        } else if (blockEntity.getType().isValid(blockState)) {
+                                            // Block entity is here and the type is correct
+                                            blockEntity.setBlockState(blockState);
+
+                                            try {
+                                                this.updateBlockEntityTicker.invoke(chunk, blockEntity);
+                                            } catch (IllegalAccessException | InvocationTargetException e) {
+                                                throw new RuntimeException(e);
+                                            }
+                                        } else {
+                                            // Block entity type isn't correct, we need to recreate it
+                                            chunk.removeBlockEntity(blockPos);
+
+                                            blockEntity = ((EntityBlock)block).newBlockEntity(blockPos, blockState);
+                                            if (blockEntity != null) {
+                                                chunk.addAndRegisterBlockEntity(blockEntity);
+                                            }
+                                        }
+                                        if (blockEntity != null && blockEntityChunkMap != null) {
+                                            int key = x | (y << 4) | (z << 8);
+                                            CompressedBlockEntity savedBlockEntity = blockEntityChunkMap.get((short) key);
+                                            if (savedBlockEntity != null) {
+                                                blockEntity.load(savedBlockEntity.decompress());
+                                            }
+                                        }
+                                    } else if (old.hasBlockEntity()) {
                                         chunk.removeBlockEntity(blockPos);
-
-                                        blockEntity = ((EntityBlock)block).newBlockEntity(blockPos, blockState);
-                                        if (blockEntity != null) {
-                                            chunk.addAndRegisterBlockEntity(blockEntity);
-                                        }
                                     }
-                                    if (blockEntity != null && blockEntityChunkMap != null) {
-                                        int key = x | (y << 4) | (z << 8);
-                                        CompressedBlockEntity savedBlockEntity = blockEntityChunkMap.get((short) key);
-                                        if (savedBlockEntity != null) {
-                                            blockEntity.load(savedBlockEntity.decompress());
-                                        }
+
+                                    // Update Light
+                                    sectionLightChanged |= LightEngine.hasDifferentLightProperties(chunk, blockPos, old, blockState);
+
+                                    // Update Poi
+                                    Optional<Holder<PoiType>> newPoi = containerMaybeHasPoi ? PoiTypes.forState(blockState) : Optional.empty();
+                                    Optional<Holder<PoiType>> oldPoi = sectionMaybeHasPoi ? PoiTypes.forState(old) : Optional.empty();
+                                    if (!Objects.equals(oldPoi, newPoi)) {
+                                        if (oldPoi.isPresent()) world.getPoiManager().remove(blockPos);
+                                        if (newPoi.isPresent()) world.getPoiManager().add(blockPos, newPoi.get());
                                     }
-                                } else if (old.hasBlockEntity()) {
-                                    chunk.removeBlockEntity(blockPos);
-                                }
-
-                                // Update Light
-                                sectionLightChanged |= LightEngine.hasDifferentLightProperties(chunk, blockPos, old, blockState);
-
-                                // Update Poi
-                                Optional<Holder<PoiType>> newPoi = containerMaybeHasPoi ? PoiTypes.forState(blockState) : Optional.empty();
-                                Optional<Holder<PoiType>> oldPoi = sectionMaybeHasPoi ? PoiTypes.forState(old) : Optional.empty();
-                                if (!Objects.equals(oldPoi, newPoi)) {
-                                    if (oldPoi.isPresent()) world.getPoiManager().remove(blockPos);
-                                    if (newPoi.isPresent()) world.getPoiManager().add(blockPos, newPoi.get());
                                 }
                             }
                         }
                     }
-                }
 
-                boolean nowHasOnlyAir = section.hasOnlyAir();
-                if (hasOnlyAir != nowHasOnlyAir) {
-                    world.getChunkSource().getLightEngine().updateSectionStatus(SectionPos.of(cx, cy, cz), nowHasOnlyAir);
-                }
+                    boolean nowHasOnlyAir = section.hasOnlyAir();
+                    if (hasOnlyAir != nowHasOnlyAir) {
+                        world.getChunkSource().getLightEngine().updateSectionStatus(SectionPos.of(cx, cy, cz), nowHasOnlyAir);
+                    }
 
-                if (sectionChanged) {
-                    extension.sendChunk(cx, cz);
-                    chunk.setUnsaved(true);
-                }
-                if (sectionLightChanged) {
-                    extension.lightChunk(cx, cz);
+                    if (sectionChanged) {
+                        extension.sendChunk(cx, cz);
+                        chunk.setUnsaved(true);
+                    }
+                    if (sectionLightChanged) {
+                        extension.lightChunk(cx, cz);
+                    }
                 }
+            } catch (Throwable t) {
+                player.getBukkitEntity().kick(net.kyori.adventure.text.Component.text("An error occured while processing block change: " + t.getMessage()));
             }
         });
     }
 
-
     private void applyBiomeBuffer(ServerPlayer player, MinecraftServer server, BiomeBuffer biomeBuffer, ResourceKey<Level> worldKey) {
         server.execute(() -> {
-            ServerLevel world = player.serverLevel();
-            if (!world.dimension().equals(worldKey)) return;
+            try {
+                ServerLevel world = player.serverLevel();
+                if (!world.dimension().equals(worldKey)) return;
 
-            if (!this.plugin.canUseAxiom(player.getBukkitEntity())) {
-                return;
-            }
-
-            if (!this.plugin.canModifyWorld(player.getBukkitEntity(), world.getWorld())) {
-                return;
-            }
-
-            Set<LevelChunk> changedChunks = new HashSet<>();
-
-            int minSection = world.getMinSection();
-            int maxSection = world.getMaxSection();
-
-            Optional<Registry<Biome>> registryOptional = world.registryAccess().registry(Registries.BIOME);
-            if (registryOptional.isEmpty()) return;
-
-            Registry<Biome> registry = registryOptional.get();
-
-            biomeBuffer.forEachEntry((x, y, z, biome) -> {
-                int cy = y >> 2;
-                if (cy < minSection || cy >= maxSection) {
+                if (!this.plugin.canUseAxiom(player.getBukkitEntity())) {
                     return;
                 }
 
-                var chunk = (LevelChunk) world.getChunk(x >> 2, z >> 2, ChunkStatus.FULL, false);
-                if (chunk == null) return;
+                if (!this.plugin.canModifyWorld(player.getBukkitEntity(), world.getWorld())) {
+                    return;
+                }
 
-                var section = chunk.getSection(cy - minSection);
-                PalettedContainer<Holder<Biome>> container = (PalettedContainer<Holder<Biome>>) section.getBiomes();
+                Set<LevelChunk> changedChunks = new HashSet<>();
 
-                var holder = registry.getHolder(biome);
-                if (holder.isPresent()) {
-                    if (!PlotSquaredIntegration.canPlaceBlock(player.getBukkitEntity(),
+                int minSection = world.getMinSection();
+                int maxSection = world.getMaxSection();
+
+                Optional<Registry<Biome>> registryOptional = world.registryAccess().registry(Registries.BIOME);
+                if (registryOptional.isEmpty()) return;
+
+                Registry<Biome> registry = registryOptional.get();
+
+                biomeBuffer.forEachEntry((x, y, z, biome) -> {
+                    int cy = y >> 2;
+                    if (cy < minSection || cy >= maxSection) {
+                        return;
+                    }
+
+                    var chunk = (LevelChunk) world.getChunk(x >> 2, z >> 2, ChunkStatus.FULL, false);
+                    if (chunk == null) return;
+
+                    var section = chunk.getSection(cy - minSection);
+                    PalettedContainer<Holder<Biome>> container = (PalettedContainer<Holder<Biome>>) section.getBiomes();
+
+                    var holder = registry.getHolder(biome);
+                    if (holder.isPresent()) {
+                        if (!PlotSquaredIntegration.canPlaceBlock(player.getBukkitEntity(),
                             new Location(player.getBukkitEntity().getWorld(), x+1, y+1, z+1))) return;
 
-                    container.set(x & 3, y & 3, z & 3, holder.get());
-                    changedChunks.add(chunk);
-                }
-            });
+                        container.set(x & 3, y & 3, z & 3, holder.get());
+                        changedChunks.add(chunk);
+                    }
+                });
 
-            var chunkMap = world.getChunkSource().chunkMap;
-            HashMap<ServerPlayer, List<LevelChunk>> map = new HashMap<>();
-            for (LevelChunk chunk : changedChunks) {
-                chunk.setUnsaved(true);
-                ChunkPos chunkPos = chunk.getPos();
-                for (ServerPlayer serverPlayer2 : chunkMap.getPlayers(chunkPos, false)) {
-                    map.computeIfAbsent(serverPlayer2, serverPlayer -> new ArrayList<>()).add(chunk);
+                var chunkMap = world.getChunkSource().chunkMap;
+                HashMap<ServerPlayer, List<LevelChunk>> map = new HashMap<>();
+                for (LevelChunk chunk : changedChunks) {
+                    chunk.setUnsaved(true);
+                    ChunkPos chunkPos = chunk.getPos();
+                    for (ServerPlayer serverPlayer2 : chunkMap.getPlayers(chunkPos, false)) {
+                        map.computeIfAbsent(serverPlayer2, serverPlayer -> new ArrayList<>()).add(chunk);
+                    }
                 }
+                map.forEach((serverPlayer, list) -> serverPlayer.connection.send(ClientboundChunksBiomesPacket.forChunks(list)));
+            } catch (Throwable t) {
+                player.getBukkitEntity().kick(net.kyori.adventure.text.Component.text("An error occured while processing biome change: " + t.getMessage()));
             }
-            map.forEach((serverPlayer, list) -> serverPlayer.connection.send(ClientboundChunksBiomesPacket.forChunks(list)));
         });
     }
 

src/main/java/com/moulberry/axiom/packet/SetBlockPacketListener.java

@@ -80,7 +80,7 @@ public class SetBlockPacketListener implements PluginMessageListener {
         FriendlyByteBuf friendlyByteBuf = new FriendlyByteBuf(Unpooled.wrappedBuffer(message));
         IntFunction<Map<BlockPos, BlockState>> mapFunction = FriendlyByteBuf.limitValue(Maps::newLinkedHashMapWithExpectedSize, 512);
         Map<BlockPos, BlockState> blocks = friendlyByteBuf.readMap(mapFunction,
-                FriendlyByteBuf::readBlockPos, buf -> buf.readById(Block.BLOCK_STATE_REGISTRY));
+                FriendlyByteBuf::readBlockPos, buf -> buf.readById(this.plugin.allowedBlockRegistry));
         boolean updateNeighbors = friendlyByteBuf.readBoolean();
 
         int reason = friendlyByteBuf.readVarInt();

src/main/resources/config.yml

@@ -28,6 +28,17 @@ whitelist-world-regex: null
 # If the regex matches the world's name, the world can't be modified
 blacklist-world-regex: null
 
+# Block buffer rate-limit (in chunk sections per second), 0 = no limit
+block-buffer-rate-limit: 0
+
+# Log large block buffer changes
+log-large-block-buffer-changes: false
+
+# Disallowed blocks
+disallowed-blocks:
+#  - "minecraft:wheat"
+#  - "minecraft:oak_stairs[waterlogged=true]"
+
 # Toggles for individual packet handlers. May break certain features
 packet-handlers:
   hello: true