Paper/patches/server/0009-Paper-command.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Mon, 29 Feb 2016 21:02:09 -0600
Subject: [PATCH] Paper command


diff --git a/src/main/java/com/destroystokyo/paper/PaperCommand.java b/src/main/java/com/destroystokyo/paper/PaperCommand.java
new file mode 100644
index 0000000000000000000000000000000000000000..b506cd11b76901827cbe66f46db8df400f7015de
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/PaperCommand.java
@@ -0,0 +1,287 @@
+package com.destroystokyo.paper;
+
+import com.google.common.base.Functions;
+import com.google.common.base.Joiner;
+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.Registry;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerChunkCache;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.level.ChunkPos;
+import org.apache.commons.lang3.tuple.MutablePair;
+import org.apache.commons.lang3.tuple.Pair;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.craftbukkit.CraftServer;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.entity.Player;
+
+import java.io.File;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import static net.kyori.adventure.text.Component.text;
+import static net.kyori.adventure.text.format.NamedTextColor.GREEN;
+import static net.kyori.adventure.text.format.NamedTextColor.RED;
+import static net.kyori.adventure.text.format.NamedTextColor.YELLOW;
+
+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").build();
+
+    public PaperCommand(String name) {
+        super(name);
+        this.description = "Paper related commands";
+        this.usageMessage = "/paper [" + Joiner.on(" | ").join(SUBCOMMANDS) + "]";
+        this.setPermission("bukkit.command.paper;" + Joiner.on(';').join(SUBCOMMANDS.stream().map(s -> BASE_PERM + s).collect(Collectors.toSet())));
+    }
+
+    private static boolean testPermission(CommandSender commandSender, String permission) {
+        if (commandSender.hasPermission(BASE_PERM + permission) || commandSender.hasPermission("bukkit.command.paper")) return true;
+        commandSender.sendMessage(text("I'm sorry, but you do not have permission to perform this command. Please contact the server administrators if you believe that this is in error.", RED));
+        return false;
+    }
+
+    @Override
+    public List<String> tabComplete(CommandSender sender, String alias, String[] args, Location location) throws IllegalArgumentException {
+        if (args.length <= 1)
+            return getListMatchingLast(sender, args, SUBCOMMANDS);
+
+        switch (args[0].toLowerCase(Locale.ENGLISH))
+        {
+            case "entity":
+                if (args.length == 2)
+                    return getListMatchingLast(sender, args, "help", "list");
+                if (args.length == 3)
+                    return getListMatchingLast(sender, args, Registry.ENTITY_TYPE.keySet().stream().map(ResourceLocation::toString).sorted().toArray(String[]::new));
+                break;
+        }
+        return Collections.emptyList();
+    }
+
+    // Code from Mojang - copyright them
+    public static List<String> getListMatchingLast(CommandSender sender, String[] args, String... matches) {
+        return getListMatchingLast(sender, args, (Collection) Arrays.asList(matches));
+    }
+
+    public static boolean matches(String s, String s1) {
+        return s1.regionMatches(true, 0, s, 0, s.length());
+    }
+
+    public static List<String> getListMatchingLast(CommandSender sender, String[] strings, Collection<?> collection) {
+        String last = strings[strings.length - 1];
+        ArrayList<String> results = Lists.newArrayList();
+
+        if (!collection.isEmpty()) {
+            Iterator iterator = Iterables.transform(collection, Functions.toStringFunction()).iterator();
+
+            while (iterator.hasNext()) {
+                String s1 = (String) iterator.next();
+
+                if (matches(last, s1) && (sender.hasPermission(BASE_PERM + s1) || sender.hasPermission("bukkit.command.paper"))) {
+                    results.add(s1);
+                }
+            }
+
+            if (results.isEmpty()) {
+                iterator = collection.iterator();
+
+                while (iterator.hasNext()) {
+                    Object object = iterator.next();
+
+                    if (object instanceof ResourceLocation && matches(last, ((ResourceLocation) object).getPath())) {
+                        results.add(String.valueOf(object));
+                    }
+                }
+            }
+        }
+
+        return results;
+    }
+    // end copy stuff
+
+    @Override
+    public boolean execute(CommandSender sender, String commandLabel, String[] args) {
+        if (!testPermission(sender)) return true;
+
+        if (args.length == 0) {
+            sender.sendMessage(text("Usage: " + this.usageMessage, RED));
+            return false;
+        }
+        if (SUBCOMMANDS.contains(args[0].toLowerCase(Locale.ENGLISH))) {
+            if (!testPermission(sender, args[0].toLowerCase(Locale.ENGLISH))) return true;
+        }
+        switch (args[0].toLowerCase(Locale.ENGLISH))  {
+            case "heap":
+                dumpHeap(sender);
+                break;
+            case "entity":
+                listEntities(sender, args);
+                break;
+            case "reload":
+                doReload(sender);
+                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":
+                Command ver = MinecraftServer.getServer().server.getCommandMap().getCommand("version");
+                if (ver != null) {
+                    ver.execute(sender, commandLabel, new String[0]);
+                    break;
+                }
+                // else - fall through to default
+            default:
+                sender.sendMessage(text("Usage: " + this.usageMessage, RED));
+                return false;
+        }
+
+        return true;
+    }
+
+    /*
+     * Ported from MinecraftForge - author: LexManos <LexManos@gmail.com> - License: LGPLv2.1
+     */
+    private void listEntities(CommandSender sender, String[] args) {
+        if (args.length < 2 || args[1].toLowerCase(Locale.ENGLISH).equals("help")) {
+            sender.sendMessage(text("Use /paper entity [list] help for more information on a specific command", RED));
+            return;
+        }
+
+        switch (args[1].toLowerCase(Locale.ENGLISH)) {
+            case "list":
+                String filter = "*";
+                if (args.length > 2) {
+                    if (args[2].toLowerCase(Locale.ENGLISH).equals("help")) {
+                        sender.sendMessage(text("Use /paper entity list [filter] [worldName] to get entity info that matches the optional filter.", RED));
+                        return;
+                    }
+                    filter = args[2];
+                }
+                final String cleanfilter = filter.replace("?", ".?").replace("*", ".*?");
+                Set<ResourceLocation> names = Registry.ENTITY_TYPE.keySet().stream()
+                        .filter(n -> n.toString().matches(cleanfilter))
+                        .collect(Collectors.toSet());
+
+                if (names.isEmpty()) {
+                    sender.sendMessage(text("Invalid filter, does not match any entities. Use /paper entity list for a proper list", RED));
+                    sender.sendMessage(text("Usage: /paper entity list [filter] [worldName]", RED));
+                    return;
+                }
+
+                String worldName;
+                if (args.length > 3) {
+                    worldName = args[3];
+                } else if (sender instanceof Player) {
+                    worldName = ((Player) sender).getWorld().getName();
+                } else {
+                    sender.sendMessage(text("Please specify the name of a world", RED));
+                    sender.sendMessage(text("To do so without a filter, specify '*' as the filter", RED));
+                    sender.sendMessage(text("Usage: /paper entity list [filter] [worldName]", RED));
+                    return;
+                }
+
+                Map<ResourceLocation, MutablePair<Integer, Map<ChunkPos, Integer>>> list = Maps.newHashMap();
+                World bukkitWorld = Bukkit.getWorld(worldName);
+                if (bukkitWorld == null) {
+                    sender.sendMessage(text("Could not load world for " + worldName + ". Please select a valid world.", RED));
+                    sender.sendMessage(text("Usage: /paper entity list [filter] [worldName]", RED));
+                    return;
+                }
+                ServerLevel world = ((CraftWorld) Bukkit.getWorld(worldName)).getHandle();
+
+                Map<ResourceLocation, Integer> nonEntityTicking = Maps.newHashMap();
+                ServerChunkCache chunkProviderServer = world.getChunkSource();
+
+                world.getAllEntities().forEach(e -> {
+                    ResourceLocation key = EntityType.getKey(e.getType());
+
+                    MutablePair<Integer, Map<ChunkPos, Integer>> info = list.computeIfAbsent(key, k -> MutablePair.of(0, Maps.newHashMap()));
+                    ChunkPos chunk = e.chunkPosition();
+                    info.left++;
+                    info.right.put(chunk, info.right.getOrDefault(chunk, 0) + 1);
+                    if (!chunkProviderServer.isPositionTicking(e)) {
+                        nonEntityTicking.merge(key, Integer.valueOf(1), Integer::sum);
+                    }
+                });
+
+                if (names.size() == 1) {
+                    ResourceLocation name = names.iterator().next();
+                    Pair<Integer, Map<ChunkPos, Integer>> info = list.get(name);
+                    int nonTicking = nonEntityTicking.getOrDefault(name, Integer.valueOf(0)).intValue();
+                    if (info == null) {
+                        sender.sendMessage(text("No entities found.", RED));
+                        return;
+                    }
+                    sender.sendMessage("Entity: " + name + " Total Ticking: " + (info.getLeft() - nonTicking) + ", Total Non-Ticking: " + nonTicking);
+                    info.getRight().entrySet().stream()
+                            .sorted((a, b) -> !a.getValue().equals(b.getValue()) ? b.getValue() - a.getValue() : a.getKey().toString().compareTo(b.getKey().toString()))
+                            .limit(10).forEach(e -> sender.sendMessage("  " + e.getValue() + ": " + e.getKey().x + ", " + e.getKey().z + (chunkProviderServer.isPositionTicking(e.getKey().toLong()) ? " (Ticking)" : " (Non-Ticking)")));
+                } else {
+                    List<Pair<ResourceLocation, Integer>> info = list.entrySet().stream()
+                            .filter(e -> names.contains(e.getKey()))
+                            .map(e -> Pair.of(e.getKey(), e.getValue().left))
+                            .sorted((a, b) -> !a.getRight().equals(b.getRight()) ? b.getRight() - a.getRight() : a.getKey().toString().compareTo(b.getKey().toString()))
+                            .collect(Collectors.toList());
+
+                    if (info == null || info.size() == 0) {
+                        sender.sendMessage(text("No entities found.", RED));
+                        return;
+                    }
+
+                    int count = info.stream().mapToInt(Pair::getRight).sum();
+                    int nonTickingCount = nonEntityTicking.values().stream().mapToInt(Integer::intValue).sum();
+                    sender.sendMessage("Total Ticking: " + (count - nonTickingCount) + ", Total Non-Ticking: " + nonTickingCount);
+                    info.forEach(e -> {
+                        int nonTicking = nonEntityTicking.getOrDefault(e.getKey(), Integer.valueOf(0)).intValue();
+                        sender.sendMessage("  " + (e.getValue() - nonTicking) + " (" + nonTicking + ") " + ": " + e.getKey());
+                    });
+                    sender.sendMessage("* First number is ticking entities, second number is non-ticking entities");
+                }
+                break;
+        }
+    }
+
+    private void dumpHeap(CommandSender sender) {
+        java.nio.file.Path dir = java.nio.file.Paths.get("./dumps");
+        String name = "heap-dump-" + DateTimeFormatter.ofPattern("yyyy-MM-dd_HH.mm.ss").format(LocalDateTime.now());
+
+        Command.broadcastCommandMessage(sender, text("Writing JVM heap data...", YELLOW));
+
+        java.nio.file.Path file = CraftServer.dumpHeap(dir, name);
+        if (file != null) {
+            Command.broadcastCommandMessage(sender, text("Heap dump saved to " + file, GREEN));
+        } else {
+            Command.broadcastCommandMessage(sender, text("Failed to write heap dump, see server log for details", RED));
+        }
+    }
+
+    private void doReload(CommandSender sender) {
+        Command.broadcastCommandMessage(sender, text("Please note that this command is not supported and may cause issues.", RED));
+        Command.broadcastCommandMessage(sender, text("If you encounter any issues please use the /stop command to restart your server.", RED));
+
+        MinecraftServer server = ((CraftServer) sender.getServer()).getServer();
+        server.paperConfigurations.reloadConfigs(server);
+        server.server.reloadCount++;
+
+        Command.broadcastCommandMessage(sender, text("Paper config reload complete.", GREEN));
+    }
+}
diff --git a/src/main/java/io/papermc/paper/command/PaperCommands.java b/src/main/java/io/papermc/paper/command/PaperCommands.java
new file mode 100644
index 0000000000000000000000000000000000000000..82bce89dc174c8c4a4ab8efeffaaf22ddeb377fb
--- /dev/null
+++ b/src/main/java/io/papermc/paper/command/PaperCommands.java
@@ -0,0 +1,25 @@
+package io.papermc.paper.command;
+
+import com.destroystokyo.paper.PaperCommand;
+import net.minecraft.server.MinecraftServer;
+import org.bukkit.command.Command;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public final class PaperCommands {
+
+    private PaperCommands() {
+    }
+
+    private static final Map<String, Command> COMMANDS = new HashMap<>();
+    static {
+        COMMANDS.put("paper", new PaperCommand("paper"));
+    }
+
+    public static void registerCommands(final MinecraftServer server) {
+        COMMANDS.forEach((s, command) -> {
+            server.server.getCommandMap().register(s, "Paper", command);
+        });
+    }
+}
diff --git a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
index e476f93547f386ded0174693a6218d793ccc450b..393e465b0bac55d407f2ec66d7b11ed0537c9641 100644
--- a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
+++ b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
@@ -191,6 +191,7 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface
         // Paper start
         paperConfigurations.initializeGlobalConfiguration();
         paperConfigurations.initializeWorldDefaultsConfiguration();
+        io.papermc.paper.command.PaperCommands.registerCommands(this);
         // Paper end
 
         this.setPvpAllowed(dedicatedserverproperties.pvp);
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 33e1a2c12a82f04d2a1da02b915402bbee76e1dd..c8c205db57a8a88b76589998819166e43f9d8c1d 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -885,6 +885,7 @@ public final class CraftServer implements Server {
         this.commandMap.clearCommands();
         this.reloadData();
         org.spigotmc.SpigotConfig.registerCommands(); // Spigot
+        io.papermc.paper.command.PaperCommands.registerCommands(this.console); // Paper
         this.overrideAllCommandBlockCommands = this.commandsConfiguration.getStringList("command-block-overrides").contains("*");
         this.ignoreVanillaPermissions = this.commandsConfiguration.getBoolean("ignore-vanilla-permissions");
 
@@ -2375,6 +2376,34 @@ public final class CraftServer implements Server {
     // Spigot end
 
     // Paper start
+    @SuppressWarnings({"rawtypes", "unchecked"})
+    public static java.nio.file.Path dumpHeap(java.nio.file.Path dir, String name) {
+        try {
+            java.nio.file.Files.createDirectories(dir);
+
+            javax.management.MBeanServer server = java.lang.management.ManagementFactory.getPlatformMBeanServer();
+            java.nio.file.Path file;
+
+            try {
+                Class clazz = Class.forName("openj9.lang.management.OpenJ9DiagnosticsMXBean");
+                Object openj9Mbean = java.lang.management.ManagementFactory.newPlatformMXBeanProxy(server, "openj9.lang.management:type=OpenJ9Diagnostics", clazz);
+                java.lang.reflect.Method m = clazz.getMethod("triggerDumpToFile", String.class, String.class);
+                file = dir.resolve(name + ".phd");
+                m.invoke(openj9Mbean, "heap", file.toString());
+            } catch (ClassNotFoundException e) {
+                Class clazz = Class.forName("com.sun.management.HotSpotDiagnosticMXBean");
+                Object hotspotMBean = java.lang.management.ManagementFactory.newPlatformMXBeanProxy(server, "com.sun.management:type=HotSpotDiagnostic", clazz);
+                java.lang.reflect.Method m = clazz.getMethod("dumpHeap", String.class, boolean.class);
+                file = dir.resolve(name + ".hprof");
+                m.invoke(hotspotMBean, file.toString(), true);
+            }
+
+            return file;
+        } catch (Throwable t) {
+            Bukkit.getLogger().log(Level.SEVERE, "Could not write heap", t);
+            return null;
+        }
+    }
     private Iterable<? extends net.kyori.adventure.audience.Audience> adventure$audiences;
     @Override
     public Iterable<? extends net.kyori.adventure.audience.Audience> audiences() {