From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: violetc <58360096+s-yh-china@users.noreply.github.com>
Date: Wed, 13 Sep 2023 19:31:20 +0800
Subject: [PATCH] Servux Protocol


diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index fba016014ffc628887dc873cfa54f8c76a72c7ef..3201913bd2fba0038ab4853931a641e361a883b1 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1610,6 +1610,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
         top.leavesmc.leaves.protocol.AppleSkinProtocol.tick(); // Leaves - appleskin
         top.leavesmc.leaves.util.BreakBedrockList.endTick(); // Leaves - break bedrock list
         top.leavesmc.leaves.protocol.bladeren.MsptSyncProtocol.tick(this); // Leaves - mspt sync
+        top.leavesmc.leaves.protocol.ServuxProtocol.tick(); // Leaves - servux
 
         for (int i = 0; i < this.tickables.size(); ++i) {
             ((Runnable) this.tickables.get(i)).run();
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 9b4bdbd98ed4d2a39d5908b0ba29f85ec6d45799..52d400b81ed45fc40983b7a238b5f8f679380471 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -3605,6 +3605,11 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
             try {
                 String channels = packet.data.toString(com.google.common.base.Charsets.UTF_8);
                 for (String channel : channels.split("\0")) {
+                    // Leaves start - leaves extra protocol
+                    if (top.leavesmc.leaves.LeavesConfig.servuxProtocol && channel.equals(top.leavesmc.leaves.protocol.ServuxProtocol.CHANNEL.toString())) {
+                        top.leavesmc.leaves.protocol.ServuxProtocol.onPlayerSubscribed(player);
+                    }
+                    // Leaves end - leaves extra protocol
                     this.getCraftPlayer().addChannel(channel);
                 }
             } catch (Exception ex) {
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index cf4ea675119d3c1a12435a6f00309ea2023e0a71..34cb5a6bd8ea93b4cdab6c9ce289c8cb68edf5f8 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -769,6 +769,7 @@ public abstract class PlayerList {
         top.leavesmc.leaves.protocol.BBORProtocol.onPlayerLoggedOut(entityplayer); // Leaves - bbor
         top.leavesmc.leaves.protocol.AppleSkinProtocol.onPlayerLoggedOut(entityplayer); // Leaves - appleskin
         top.leavesmc.leaves.protocol.bladeren.MsptSyncProtocol.onPlayerLoggedOut(entityplayer); // Leaves - mspt sync
+        top.leavesmc.leaves.protocol.ServuxProtocol.onPlayerLoggedOut(entityplayer); // Leaves - servux
         // Paper end
         ServerLevel worldserver = entityplayer.serverLevel();
 
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
index e34e6fa60cedb925e2cb6f3a031d4157a9633eb5..f08c9be4a3fbab9f95167226b489d5d7bf0bdfac 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -1030,6 +1030,7 @@ public class LevelChunk extends ChunkAccess {
         // Leaves start - bbor
         if (loaded) {
             top.leavesmc.leaves.protocol.BBORProtocol.onChunkLoaded(this);
+            top.leavesmc.leaves.protocol.ServuxProtocol.onChunkLoaded(this); // and servux
         }
         // Leaves end - bbor
     }
diff --git a/src/main/java/top/leavesmc/leaves/protocol/ServuxProtocol.java b/src/main/java/top/leavesmc/leaves/protocol/ServuxProtocol.java
new file mode 100644
index 0000000000000000000000000000000000000000..3102c81528595d82c5ef9b8ceee15d2d595fc434
--- /dev/null
+++ b/src/main/java/top/leavesmc/leaves/protocol/ServuxProtocol.java
@@ -0,0 +1,159 @@
+package top.leavesmc.leaves.protocol;
+
+import io.netty.buffer.Unpooled;
+import net.minecraft.core.Registry;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.ListTag;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.level.chunk.LevelChunk;
+import net.minecraft.world.level.levelgen.structure.BoundingBox;
+import net.minecraft.world.level.levelgen.structure.Structure;
+import net.minecraft.world.level.levelgen.structure.StructureStart;
+import net.minecraft.world.level.levelgen.structure.pieces.StructurePieceSerializationContext;
+import org.jetbrains.annotations.Contract;
+import org.jetbrains.annotations.NotNull;
+import top.leavesmc.leaves.LeavesConfig;
+import top.leavesmc.leaves.util.ProtocolUtils;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class ServuxProtocol {
+
+    public static final String PROTOCOL_ID = "servux";
+
+    public static final int PROTOCOL_VERSION = 1;
+    public static final int PACKET_METADATA = 1;
+    public static final int PACKET_STRUCTURE_DATA = 2;
+
+    public static final ResourceLocation CHANNEL = id("structures");
+
+    private static final Map<Integer, ServerPlayer> players = new ConcurrentHashMap<>();
+    private static final Map<Integer, Set<BoundingBox>> playerBoundingBoxesCache = new HashMap<>();
+    private static final Map<ResourceLocation, Map<BoundingBox, CompoundTag>> dimensionCache = new ConcurrentHashMap<>();
+
+    @Contract("_ -> new")
+    public static @NotNull ResourceLocation id(String path) {
+        return new ResourceLocation(PROTOCOL_ID, path);
+    }
+
+    public static void onPlayerSubscribed(@NotNull ServerPlayer player) {
+        if (LeavesConfig.servuxProtocol) {
+            players.put(player.getId(), player);
+
+            CompoundTag tag = new CompoundTag();
+            tag.putInt("version", PROTOCOL_VERSION);
+            tag.putString("id", CHANNEL.toString());
+            tag.putInt("timeout", Integer.MAX_VALUE - 200);
+            sendNBTPacket(player, PACKET_METADATA, tag);
+        }
+    }
+
+    public static void onPlayerLoggedOut(@NotNull ServerPlayer player) {
+        if (LeavesConfig.servuxProtocol) {
+            players.remove(player.getId());
+            playerBoundingBoxesCache.remove(player.getId());
+        }
+    }
+
+    public static void onChunkLoaded(@NotNull LevelChunk chunk) {
+        if (LeavesConfig.servuxProtocol) {
+            List<StructureStart> structures = new ArrayList<>();
+            final Registry<Structure> structureFeatureRegistry = chunk.getLevel().registryAccess().registryOrThrow(Registries.STRUCTURE);
+            for (var es : chunk.getAllStarts().entrySet()) {
+                final var optional = structureFeatureRegistry.getResourceKey(es.getKey());
+                optional.ifPresent(key -> structures.add(es.getValue()));
+            }
+
+            if (!structures.isEmpty()) {
+                onStructuresLoaded((ServerLevel) chunk.getLevel(), structures);
+            }
+        }
+    }
+
+    public static void onStructuresLoaded(@NotNull ServerLevel level, @NotNull List<StructureStart> structures) {
+        Map<BoundingBox, CompoundTag> cache = getOrCreateCache(level.dimension().location());
+        for (StructureStart structureStart : structures) {
+            if (structureStart == null) {
+                return;
+            }
+
+            StructurePieceSerializationContext ctx = StructurePieceSerializationContext.fromLevel(level);
+
+            BoundingBox boundingBox = structureStart.getBoundingBox();
+            if (cache.containsKey(boundingBox)) {
+                return;
+            }
+
+            cache.put(boundingBox, structureStart.createTag(ctx, structureStart.getChunkPos()));
+        }
+    }
+
+    private static void sendBoundingToPlayer(int id, ServerPlayer player) {
+        Map<BoundingBox, CompoundTag> boundingBoxMap = dimensionCache.get(player.level().dimension().location());
+        if (boundingBoxMap == null) {
+            return;
+        }
+
+        Set<BoundingBox> playerBoundingBoxes = playerBoundingBoxesCache.computeIfAbsent(id, k -> new HashSet<>());
+
+        ListTag listTag = new ListTag();
+        for (BoundingBox key : boundingBoxMap.keySet()) {
+            if (listTag.size() >= 50) {
+                break;
+            }
+            if (playerBoundingBoxes.contains(key)) {
+                continue;
+            }
+
+            CompoundTag boundingBoxes = boundingBoxMap.get(key);
+            if (boundingBoxes != null) {
+                listTag.add(boundingBoxes);
+            }
+            playerBoundingBoxes.add(key);
+        }
+
+        if (!listTag.isEmpty()) {
+            CompoundTag tag = new CompoundTag();
+            tag.put("Structures", listTag);
+            sendNBTPacket(player, PACKET_STRUCTURE_DATA, tag);
+        }
+    }
+
+    public static void tick() {
+        if (LeavesConfig.servuxProtocol) {
+            for (var playerEntry : players.entrySet()) {
+                sendBoundingToPlayer(playerEntry.getKey(), playerEntry.getValue());
+            }
+        }
+    }
+
+    private static Map<BoundingBox, CompoundTag> getOrCreateCache(ResourceLocation dimensionId) {
+        return dimensionCache.computeIfAbsent(dimensionId, dt -> new ConcurrentHashMap<>());
+    }
+
+    public static void sendNBTPacket(ServerPlayer player, int packetType, CompoundTag data) {
+        FriendlyByteBuf buf = new FriendlyByteBuf(Unpooled.buffer());
+        buf.writeVarInt(packetType);
+        buf.writeNbt(data);
+
+        int len = buf.writerIndex();
+        buf.readerIndex(0);
+
+        FriendlyByteBuf buf1 = new FriendlyByteBuf(Unpooled.buffer(len));
+        buf1.writeVarInt(len);
+        buf1.writeBytes(buf, len);
+        ProtocolUtils.sendPayloadPacket(player, CHANNEL, buf1);
+
+        buf.release();
+    }
+}