src/game/java/net/minecraft/client/DebugQueryHandler.java

package net.minecraft.client;

import java.util.function.Consumer;
import javax.annotation.Nullable;
import net.minecraft.client.multiplayer.ClientPacketListener;
import net.minecraft.core.BlockPos;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.network.protocol.game.ServerboundBlockEntityTagQueryPacket;
import net.minecraft.network.protocol.game.ServerboundEntityTagQueryPacket;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.api.distmarker.OnlyIn;

@OnlyIn(Dist.CLIENT)
public class DebugQueryHandler {
    private final ClientPacketListener connection;
    private int transactionId = -1;
    @Nullable
    private Consumer<CompoundTag> callback;

    public DebugQueryHandler(ClientPacketListener p_90701_) {
        this.connection = p_90701_;
    }

    public boolean handleResponse(int p_90706_, @Nullable CompoundTag p_90707_) {
        if (this.transactionId == p_90706_ && this.callback != null) {
            this.callback.accept(p_90707_);
            this.callback = null;
            return true;
        } else {
            return false;
        }
    }

    private int startTransaction(Consumer<CompoundTag> p_90712_) {
        this.callback = p_90712_;
        return ++this.transactionId;
    }

    public void queryEntityTag(int p_90703_, Consumer<CompoundTag> p_90704_) {
        int i = this.startTransaction(p_90704_);
        this.connection.send(new ServerboundEntityTagQueryPacket(i, p_90703_));
    }

    public void queryBlockEntityTag(BlockPos p_90709_, Consumer<CompoundTag> p_90710_) {
        int i = this.startTransaction(p_90710_);
        this.connection.send(new ServerboundBlockEntityTagQueryPacket(i, p_90709_));
    }
}