Paper/Spigot-Server-Patches/0470-Fix-Light-Command.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 7 May 2020 19:17:36 -0400
Subject: [PATCH] Fix Light Command

This lets you run /paper fixlight <chunkRadius> (max 5) to automatically
fix all light data in the chunks.

diff --git a/src/main/java/com/destroystokyo/paper/PaperCommand.java b/src/main/java/com/destroystokyo/paper/PaperCommand.java
index eb1e86e8bb0f421e3686ffa02a4015a588107863..d165e8c232c38ba2e2faf93c60c8a127bb74c9b6 100644
--- a/src/main/java/com/destroystokyo/paper/PaperCommand.java
+++ b/src/main/java/com/destroystokyo/paper/PaperCommand.java
@@ -8,6 +8,8 @@ import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
+import net.minecraft.core.BlockPosition;
+import net.minecraft.network.protocol.game.PacketPlayOutLightUpdate;
 import net.minecraft.resources.MinecraftKey;
 import com.google.gson.JsonObject;
 import com.google.gson.internal.Streams;
@@ -15,12 +17,14 @@ import com.google.gson.stream.JsonWriter;
 import net.minecraft.server.MCUtil;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.level.ChunkProviderServer;
+import net.minecraft.server.level.EntityPlayer;
+import net.minecraft.server.level.LightEngineThreaded;
 import net.minecraft.server.level.PlayerChunk;
 import net.minecraft.server.level.WorldServer;
 import net.minecraft.world.entity.Entity;
 import net.minecraft.world.entity.EntityTypes;
 import net.minecraft.world.level.ChunkCoordIntPair;
-import net.minecraft.server.MCUtil;
+import net.minecraft.world.level.chunk.Chunk;
 import org.apache.commons.lang3.tuple.MutablePair;
 import org.apache.commons.lang3.tuple.Pair;
 import org.bukkit.Bukkit;
@@ -31,6 +35,7 @@ import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
 import org.bukkit.entity.Player;
 
 import java.io.File;
@@ -39,10 +44,12 @@ import java.io.PrintStream;
 import java.io.StringWriter;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
+import java.util.ArrayDeque;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.Deque;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Locale;
@@ -52,7 +59,7 @@ import java.util.stream.Collectors;
 
 public class PaperCommand extends Command {
     private static final String BASE_PERM = "bukkit.command.paper.";
-    private static final ImmutableSet<String> SUBCOMMANDS = ImmutableSet.<String>builder().add("heap", "entity", "reload", "version", "debug", "chunkinfo", "dumpwaiting", "syncloadinfo").build();
+    private static final ImmutableSet<String> SUBCOMMANDS = ImmutableSet.<String>builder().add("heap", "entity", "reload", "version", "debug", "chunkinfo", "dumpwaiting", "syncloadinfo", "fixlight").build();
 
     public PaperCommand(String name) {
         super(name);
@@ -173,6 +180,9 @@ public class PaperCommand extends Command {
             case "syncloadinfo":
                 this.doSyncLoadInfo(sender, args);
                 break;
+            case "fixlight":
+                this.doFixLight(sender, args);
+                break;
             case "ver":
                 if (!testPermission(sender, "version")) break; // "ver" needs a special check because it's an alias. All other commands are checked up before the switch statement (because they are present in the SUBCOMMANDS set)
             case "version":
@@ -190,6 +200,77 @@ public class PaperCommand extends Command {
         return true;
     }
 
+    private void doFixLight(CommandSender sender, String[] args) {
+        if (!(sender instanceof Player)) {
+            sender.sendMessage("Only players can use this command");
+            return;
+        }
+        int radius = 2;
+        if (args.length > 1) {
+            try {
+                radius = Math.min(5, Integer.parseInt(args[1]));
+            } catch (Exception e) {
+                sender.sendMessage("Not a number");
+                return;
+            }
+
+        }
+
+        CraftPlayer player = (CraftPlayer) sender;
+        EntityPlayer handle = player.getHandle();
+        WorldServer world = (WorldServer) handle.world;
+        LightEngineThreaded lightengine = world.getChunkProvider().getLightEngine();
+
+        BlockPosition center = MCUtil.toBlockPosition(player.getLocation());
+        Deque<ChunkCoordIntPair> queue = new ArrayDeque<>(MCUtil.getSpiralOutChunks(center, radius));
+        updateLight(sender, world, lightengine, queue);
+    }
+
+    private void updateLight(CommandSender sender, WorldServer world, LightEngineThreaded lightengine, Deque<ChunkCoordIntPair> queue) {
+        ChunkCoordIntPair coord = queue.poll();
+        if (coord == null) {
+            sender.sendMessage("All Chunks Light updated");
+            return;
+        }
+        world.getChunkProvider().getChunkAtAsynchronously(coord.x, coord.z, false, false).whenCompleteAsync((either, ex) -> {
+            if (ex != null) {
+                sender.sendMessage("Error loading chunk " + coord);
+                updateLight(sender, world, lightengine, queue);
+                return;
+            }
+            Chunk chunk = (Chunk) either.left().orElse(null);
+            if (chunk == null) {
+                updateLight(sender, world, lightengine, queue);
+                return;
+            }
+            lightengine.a(world.paperConfig.lightQueueSize + 16 * 256); // ensure full chunk can fit into queue
+            sender.sendMessage("Updating Light " + coord);
+            int cx = chunk.getPos().x << 4;
+            int cz = chunk.getPos().z << 4;
+            for (int y = 0; y < world.getHeight(); y++) {
+                for (int x = 0; x < 16; x++) {
+                    for (int z = 0; z < 16; z++) {
+                        BlockPosition pos = new BlockPosition(cx + x, y, cz + z);
+                        lightengine.a(pos);
+                    }
+                }
+            }
+            lightengine.queueUpdate();
+            PlayerChunk visibleChunk = world.getChunkProvider().playerChunkMap.getVisibleChunk(chunk.coordinateKey);
+            if (visibleChunk != null) {
+                world.getChunkProvider().playerChunkMap.addLightTask(visibleChunk, () -> {
+                    MinecraftServer.getServer().processQueue.add(() -> {
+                        visibleChunk.sendPacketToTrackedPlayers(new PacketPlayOutLightUpdate(chunk.getPos(), lightengine, true), false);
+                        updateLight(sender, world, lightengine, queue);
+                    });
+                });
+            } else {
+                updateLight(sender, world, lightengine, queue);
+            }
+            lightengine.a(world.paperConfig.lightQueueSize);
+        }, MinecraftServer.getServer());
+    }
+
     private void doSyncLoadInfo(CommandSender sender, String[] args) {
         if (!SyncLoadFinder.ENABLED) {
             sender.sendMessage(ChatColor.RED + "This command requires the server startup flag '-Dpaper.debug-sync-loads=true' to be set.");
diff --git a/src/main/java/net/minecraft/server/level/PlayerChunk.java b/src/main/java/net/minecraft/server/level/PlayerChunk.java
index 1f6333c2c26ad04e23d2881235ed1dcf707be038..e53054fc46e528f9c713eb4c03add61316e19396 100644
--- a/src/main/java/net/minecraft/server/level/PlayerChunk.java
+++ b/src/main/java/net/minecraft/server/level/PlayerChunk.java
@@ -350,6 +350,7 @@ public class PlayerChunk {
 
     }
 
+    public void sendPacketToTrackedPlayers(Packet<?> packet, boolean flag) { a(packet, flag); } // Paper - OBFHELPER
     private void a(Packet<?> packet, boolean flag) {
         // Paper start - per player view distance
         // there can be potential desync with player's last mapped section and the view distance map, so use the
diff --git a/src/main/java/net/minecraft/server/level/PlayerChunkMap.java b/src/main/java/net/minecraft/server/level/PlayerChunkMap.java
index e4b5649fbc8cb9662e818581fe2891641de419b6..a7e3a979dca4dd7705a8f80366677378f0643f27 100644
--- a/src/main/java/net/minecraft/server/level/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/PlayerChunkMap.java
@@ -346,11 +346,12 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
         Mailbox<Runnable> mailbox = Mailbox.a("main", iasynctaskhandler::a);
 
         this.worldLoadListener = worldloadlistener;
-        ThreadedMailbox<Runnable> threadedmailbox1 = ThreadedMailbox.a(executor, "light");
+        ThreadedMailbox<Runnable> lightthreaded; ThreadedMailbox<Runnable> threadedmailbox1 = lightthreaded = ThreadedMailbox.a(executor, "light"); // Paper
 
         this.p = new ChunkTaskQueueSorter(ImmutableList.of(threadedmailbox, mailbox, threadedmailbox1), executor, Integer.MAX_VALUE);
         this.mailboxWorldGen = this.p.a(threadedmailbox, false);
         this.mailboxMain = this.p.a(mailbox, false);
+        this.mailboxLight = this.p.a(lightthreaded, false);// Paper
         this.lightEngine = new LightEngineThreaded(ilightaccess, this, this.world.getDimensionManager().hasSkyLight(), threadedmailbox1, this.p.a(threadedmailbox1, false));
         this.chunkDistanceManager = new PlayerChunkMap.a(executor, iasynctaskhandler); this.chunkDistanceManager.chunkMap = this; // Paper
         this.l = supplier;