Improve handling of contraption data for syncing and minecart pickup

- filter out null contraptions in ContraptionRenderingWorld
- fix and unify contraption data size estimates
- add config for max contraption size for syncing
- Minecart pickup max is increased if XL Packets is loaded

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/AbstractContraptionEntity.java

@@ -1,6 +1,5 @@
 package com.simibubi.create.content.contraptions.components.structureMovement;
 
-import java.io.IOException;
 import java.util.Collection;
 import java.util.IdentityHashMap;
 import java.util.List;
@@ -11,11 +10,11 @@ import java.util.UUID;
 
 import javax.annotation.Nullable;
 
+import com.simibubi.create.foundation.utility.ContraptionData;
+
 import org.apache.commons.lang3.mutable.MutableInt;
 import org.apache.commons.lang3.tuple.MutablePair;
 
-import com.google.common.io.ByteArrayDataOutput;
-import com.google.common.io.ByteStreams;
 import com.mojang.blaze3d.vertex.PoseStack;
 import com.simibubi.create.AllItems;
 import com.simibubi.create.AllMovementBehaviours;
@@ -44,7 +43,6 @@ import net.minecraft.client.Minecraft;
 import net.minecraft.core.BlockPos;
 import net.minecraft.core.Direction;
 import net.minecraft.nbt.CompoundTag;
-import net.minecraft.nbt.NbtIo;
 import net.minecraft.nbt.Tag;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.network.chat.Component;
@@ -598,22 +596,10 @@ public abstract class AbstractContraptionEntity extends Entity implements IEntit
 		CompoundTag compound = new CompoundTag();
 		writeAdditional(compound, true);
 
-		try {
+		if (ContraptionData.isTooLargeForSync(compound)) {
-			ByteArrayDataOutput dataOutput = ByteStreams.newDataOutput();
+			String info = getContraption().getType().id + " @" + position() + " (" + getStringUUID() + ")";
-			NbtIo.write(compound, dataOutput);
+			Create.LOGGER.warn("Could not send Contraption Spawn Data (Packet too big): " + info);
-			byte[] byteArray = dataOutput.toByteArray();
+			compound = null;
-			int estimatedPacketSize = byteArray.length;
-			if (estimatedPacketSize > 2_000_000) {
-				Create.LOGGER.warn("Could not send Contraption Spawn Data (Packet too big): "
-					+ getContraption().getType().id + " @" + position() + " (" + getUUID().toString() + ")");
-				buffer.writeNbt(new CompoundTag());
-				return;
-			}
-
-		} catch (IOException e) {
-			e.printStackTrace();
-			buffer.writeNbt(new CompoundTag());
-			return;
 		}
 
 		buffer.writeNbt(compound);
@@ -633,7 +619,10 @@ public abstract class AbstractContraptionEntity extends Entity implements IEntit
 
 	@Override
 	public void readSpawnData(FriendlyByteBuf additionalData) {
-		readAdditional(additionalData.readNbt(), true);
+		CompoundTag nbt = additionalData.readAnySizeNbt();
+		if (nbt != null) {
+			readAdditional(nbt, true);
+		}
 	}
 
 	@Override

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/mounted/MinecartContraptionItem.java

@@ -1,14 +1,15 @@
 package com.simibubi.create.content.contraptions.components.structureMovement.mounted;
 
-import java.io.IOException;
 import java.util.List;
 
 import javax.annotation.Nullable;
 
+import com.simibubi.create.foundation.utility.ContraptionData;
+
+import net.minecraft.network.chat.MutableComponent;
+
 import org.apache.commons.lang3.tuple.MutablePair;
 
-import com.google.common.io.ByteArrayDataOutput;
-import com.google.common.io.ByteStreams;
 import com.simibubi.create.AllItems;
 import com.simibubi.create.AllMovementBehaviours;
 import com.simibubi.create.content.contraptions.components.actors.PortableStorageInterfaceMovement;
@@ -31,7 +32,6 @@ import net.minecraft.core.NonNullList;
 import net.minecraft.core.dispenser.DefaultDispenseItemBehavior;
 import net.minecraft.core.dispenser.DispenseItemBehavior;
 import net.minecraft.nbt.CompoundTag;
-import net.minecraft.nbt.NbtIo;
 import net.minecraft.tags.BlockTags;
 import net.minecraft.world.InteractionResult;
 import net.minecraft.world.entity.Entity;
@@ -251,18 +251,10 @@ public class MinecartContraptionItem extends Item {
 
 		ItemStack generatedStack = create(type, oce).setHoverName(entity.getCustomName());
 
-		try {
+		if (ContraptionData.isTooLargeForPickup(generatedStack.serializeNBT())) {
-			ByteArrayDataOutput dataOutput = ByteStreams.newDataOutput();
+			MutableComponent message = Lang.translateDirect("contraption.minecart_contraption_too_big")
-			NbtIo.write(generatedStack.serializeNBT(), dataOutput);
+					.withStyle(ChatFormatting.RED);
-			int estimatedPacketSize = dataOutput.toByteArray().length;
+			player.displayClientMessage(message, true);
-			if (estimatedPacketSize > 2_000_000) {
-				player.displayClientMessage(Lang.translateDirect("contraption.minecart_contraption_too_big")
-					.withStyle(ChatFormatting.RED), true);
-				return;
-			}
-
-		} catch (IOException e) {
-			e.printStackTrace();
 			return;
 		}
 

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/render/ContraptionRenderingWorld.java

@@ -64,6 +64,7 @@ public abstract class ContraptionRenderingWorld<C extends ContraptionRenderInfo>
 				.map(Reference::get)
 				.filter(Objects::nonNull)
 				.map(AbstractContraptionEntity::getContraption)
+				.filter(Objects::nonNull) // contraptions that are too large will not be synced, and un-synced contraptions will be null
 				.forEach(this::getRenderInfo);
 	}
 

src/main/java/com/simibubi/create/foundation/config/CKinetics.java

@@ -1,6 +1,7 @@
 package com.simibubi.create.foundation.config;
 
 import com.simibubi.create.foundation.config.ui.ConfigAnnotations;
+import com.simibubi.create.foundation.utility.ContraptionData;
 
 public class CKinetics extends ConfigBase {
 
@@ -30,6 +31,8 @@ public class CKinetics extends ConfigBase {
 
 	public final ConfigGroup contraptions = group(1, "contraptions", "Moving Contraptions");
 	public final ConfigInt maxBlocksMoved = i(2048, 1, "maxBlocksMoved", Comments.maxBlocksMoved);
+	public final ConfigInt maxDataSize =
+		i(ContraptionData.DEFAULT_MAX, 0, "maxDataSize", Comments.bytes, Comments.maxDataDisable, Comments.maxDataSize, Comments.maxDataSize2);
 	public final ConfigInt maxChassisRange = i(16, 1, "maxChassisRange", Comments.maxChassisRange);
 	public final ConfigInt maxPistonPoles = i(64, 1, "maxPistonPoles", Comments.maxPistonPoles);
 	public final ConfigInt maxRopeLength = i(256, 1, "maxRopeLength", Comments.maxRopeLength);
@@ -75,6 +78,9 @@ public class CKinetics extends ConfigBase {
 			"multiplier used for calculating exhaustion from speed when a crank is turned.";
 		static String maxBlocksMoved =
 			"Maximum amount of blocks in a structure movable by Pistons, Bearings or other means.";
+		static String maxDataSize = "Maximum amount of data a contraption can have before it can't be synced with players.";
+		static String maxDataSize2 = "Un-synced contraptions will not be visible and will not have collision.";
+		static String maxDataDisable = "[0 to disable this limit]";
 		static String maxChassisRange = "Maximum value of a chassis attachment range.";
 		static String maxPistonPoles = "Maximum amount of extension poles behind a Mechanical Piston.";
 		static String maxRopeLength = "Max length of rope available off a Rope Pulley.";
@@ -86,6 +92,7 @@ public class CKinetics extends ConfigBase {
 		static String stats = "Configure speed/capacity levels for requirements and indicators.";
 		static String rpm = "[in Revolutions per Minute]";
 		static String su = "[in Stress Units]";
+		static String bytes = "[in Bytes]";
 		static String mediumSpeed = "Minimum speed of rotation to be considered 'medium'";
 		static String fastSpeed = "Minimum speed of rotation to be considered 'fast'";
 		static String mediumStressImpact = "Minimum stress impact to be considered 'medium'";

src/main/java/com/simibubi/create/foundation/mixin/accessor/NbtAccounterAccessor.java

@@ -0,0 +1,12 @@
+package com.simibubi.create.foundation.mixin.accessor;
+
+import net.minecraft.nbt.NbtAccounter;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+@Mixin(NbtAccounter.class)
+public interface NbtAccounterAccessor {
+	@Accessor("usage")
+	long create$getUsage();
+}

src/main/java/com/simibubi/create/foundation/utility/ContraptionData.java

@@ -0,0 +1,56 @@
+package com.simibubi.create.foundation.utility;
+
+import com.simibubi.create.foundation.config.AllConfigs;
+import com.simibubi.create.foundation.mixin.accessor.NbtAccounterAccessor;
+
+import io.netty.buffer.Unpooled;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.NbtAccounter;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.network.protocol.game.ClientboundContainerSetSlotPacket;
+import net.minecraftforge.fml.ModList;
+
+public class ContraptionData {
+	/**
+	 * A sane, default maximum for contraption data size.
+	 */
+	public static final int DEFAULT_MAX = 2_000_000;
+	/**
+	 * XL Packets expands the NBT packet limit to 2 GB.
+	 */
+	public static final int EXPANDED_MAX = 2_000_000_000;
+	/**
+	 * Minecart item sizes are limited by the vanilla slot change packet ({@link ClientboundContainerSetSlotPacket}).
+	 * {@link ContraptionData#DEFAULT_MAX} is used as the default.
+	 * XL Packets expands the size limit to ~2 GB. If the mod is loaded, we take advantage of it and use the higher limit.
+	 */
+	public static final int PICKUP_MAX = ModList.get().isLoaded("xlpackets") ? EXPANDED_MAX : DEFAULT_MAX;
+
+	/**
+	 * @return true if the given NBT is too large for a contraption to be synced to clients.
+	 */
+	public static boolean isTooLargeForSync(CompoundTag data) {
+		int max = AllConfigs.SERVER.kinetics.maxDataSize.get();
+		return max != 0 && packetSize(data) > max;
+	}
+
+	/**
+	 * @return true if the given NBT is too large for a contraption to be picked up with a wrench.
+	 */
+	public static boolean isTooLargeForPickup(CompoundTag data) {
+		return packetSize(data) > PICKUP_MAX;
+	}
+
+	/**
+	 * @return the size of the given NBT when put through a packet, in bytes.
+	 */
+	public static long packetSize(CompoundTag data) {
+		FriendlyByteBuf test = new FriendlyByteBuf(Unpooled.buffer());
+		test.writeNbt(data);
+		NbtAccounter sizeTracker = new NbtAccounter(Long.MAX_VALUE);
+		test.readNbt(sizeTracker);
+		long size = ((NbtAccounterAccessor) sizeTracker).create$getUsage();
+		test.release();
+		return size;
+	}
+}

src/main/resources/create.mixins.json

@@ -13,6 +13,7 @@
     "accessor.DispenserBlockAccessor",
     "accessor.FallingBlockEntityAccessor",
     "accessor.LivingEntityAccessor",
+    "accessor.NbtAccounterAccessor",
     "accessor.ServerLevelAccessor"
   ],
   "client": [