Paper/patches/server/0004-Paper-config-files.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 config files

Loads each yml file for early init too so it can be used for early options

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..bee2fa2bfbb61209381f24ed6508d3d1c73a344a
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/PaperCommand.java
@@ -0,0 +1,285 @@
+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.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.ChatColor;
+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;
+
+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(ChatColor.RED + "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."); // Sorry, kashike
+        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, EntityType.getEntityNameList().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(ChatColor.RED + "Usage: " + usageMessage);
+            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(ChatColor.RED + "Usage: " + usageMessage);
+                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(ChatColor.RED + "Use /paper entity [list] help for more information on a specific command.");
+            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(ChatColor.RED + "Use /paper entity list [filter] [worldName] to get entity info that matches the optional filter.");
+                        return;
+                    }
+                    filter = args[2];
+                }
+                final String cleanfilter = filter.replace("?", ".?").replace("*", ".*?");
+                Set<ResourceLocation> names = EntityType.getEntityNameList().stream()
+                        .filter(n -> n.toString().matches(cleanfilter))
+                        .collect(Collectors.toSet());
+
+                if (names.isEmpty()) {
+                    sender.sendMessage(ChatColor.RED + "Invalid filter, does not match any entities. Use /paper entity list for a proper list");
+                    sender.sendMessage(ChatColor.RED + "Usage: /paper entity list [filter] [worldName]");
+                    return;
+                }
+
+                String worldName;
+                if (args.length > 3) {
+                    worldName = args[3];
+                } else if (sender instanceof Player) {
+                    worldName = ((Player) sender).getWorld().getName();
+                } else {
+                    sender.sendMessage(ChatColor.RED + "Please specify the name of a world");
+                    sender.sendMessage(ChatColor.RED + "To do so without a filter, specify '*' as the filter");
+                    sender.sendMessage(ChatColor.RED + "Usage: /paper entity list [filter] [worldName]");
+                    return;
+                }
+
+                Map<ResourceLocation, MutablePair<Integer, Map<ChunkPos, Integer>>> list = Maps.newHashMap();
+                World bukkitWorld = Bukkit.getWorld(worldName);
+                if (bukkitWorld == null) {
+                    sender.sendMessage(ChatColor.RED + "Could not load world for " + worldName + ". Please select a valid world.");
+                    sender.sendMessage(ChatColor.RED + "Usage: /paper entity list [filter] [worldName]");
+                    return;
+                }
+                ServerLevel world = ((CraftWorld) Bukkit.getWorld(worldName)).getHandle();
+
+                Map<ResourceLocation, Integer> nonEntityTicking = Maps.newHashMap();
+                ServerChunkCache chunkProviderServer = world.getChunkSource();
+
+                world.getAllEntities().forEach(e -> {
+                    ResourceLocation key = new ResourceLocation(""); // TODO: update in next patch
+
+                    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(ChatColor.RED + "No entities found.");
+                        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(ChatColor.RED + "No entities found.");
+                        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, ChatColor.YELLOW + "Writing JVM heap data...");
+
+        java.nio.file.Path file = CraftServer.dumpHeap(dir, name);
+        if (file != null) {
+            Command.broadcastCommandMessage(sender, ChatColor.GREEN + "Heap dump saved to " + file);
+        } else {
+            Command.broadcastCommandMessage(sender, ChatColor.RED + "Failed to write heap dump, see sever log for details");
+        }
+    }
+
+    private void doReload(CommandSender sender) {
+        Command.broadcastCommandMessage(sender, ChatColor.RED + "Please note that this command is not supported and may cause issues.");
+        Command.broadcastCommandMessage(sender, ChatColor.RED + "If you encounter any issues please use the /stop command to restart your server.");
+
+        MinecraftServer console = MinecraftServer.getServer();
+        com.destroystokyo.paper.PaperConfig.init((File) console.options.valueOf("paper-settings"));
+        for (ServerLevel world : console.getAllLevels()) {
+            world.paperConfig.init();
+        }
+        console.server.reloadCount++;
+
+        Command.broadcastCommandMessage(sender, ChatColor.GREEN + "Paper config reload complete.");
+    }
+}
diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
new file mode 100644
index 0000000000000000000000000000000000000000..e4368db074da7b5e48b47d41875c1e63b9745c2a
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -0,0 +1,188 @@
+package com.destroystokyo.paper;
+
+import com.google.common.base.Throwables;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Level;
+import java.util.regex.Pattern;
+
+import net.minecraft.server.MinecraftServer;
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.configuration.InvalidConfigurationException;
+import org.bukkit.configuration.file.YamlConfiguration;
+
+public class PaperConfig {
+
+    private static File CONFIG_FILE;
+    private static final String HEADER = "This is the main configuration file for Paper.\n"
+            + "As you can see, there's tons to configure. Some options may impact gameplay, so use\n"
+            + "with caution, and make sure you know what each option does before configuring.\n"
+            + "\n"
+            + "If you need help with the configuration or have any questions related to Paper,\n"
+            + "join us in our Discord or IRC channel.\n"
+            + "\n"
+            + "Discord: https://discord.gg/papermc\n"
+            + "IRC: #paper @ irc.esper.net ( https://webchat.esper.net/?channels=paper ) \n"
+            + "Website: https://papermc.io/ \n"
+            + "Docs: https://paper.readthedocs.org/ \n";
+    /*========================================================================*/
+    public static YamlConfiguration config;
+    static int version;
+    static Map<String, Command> commands;
+    private static boolean verbose;
+    private static boolean fatalError;
+    /*========================================================================*/
+
+    public static void init(File configFile) {
+        CONFIG_FILE = configFile;
+        config = new YamlConfiguration();
+        try {
+            config.load(CONFIG_FILE);
+        } catch (IOException ex) {
+        } catch (InvalidConfigurationException ex) {
+            Bukkit.getLogger().log(Level.SEVERE, "Could not load paper.yml, please correct your syntax errors", ex);
+            throw Throwables.propagate(ex);
+        }
+        config.options().header(HEADER);
+        config.options().copyDefaults(true);
+        verbose = getBoolean("verbose", false);
+
+        commands = new HashMap<String, Command>();
+        commands.put("paper", new PaperCommand("paper"));
+
+        version = getInt("config-version", 24);
+        set("config-version", 24);
+        readConfig(PaperConfig.class, null);
+    }
+
+    protected static void logError(String s) {
+        Bukkit.getLogger().severe(s);
+    }
+
+    protected static void fatal(String s) {
+        fatalError = true;
+        throw new RuntimeException("Fatal paper.yml config error: " + s);
+    }
+
+    protected static void log(String s) {
+        if (verbose) {
+            Bukkit.getLogger().info(s);
+        }
+    }
+
+    public static void registerCommands() {
+        for (Map.Entry<String, Command> entry : commands.entrySet()) {
+            MinecraftServer.getServer().server.getCommandMap().register(entry.getKey(), "Paper", entry.getValue());
+        }
+    }
+
+    static void readConfig(Class<?> clazz, Object instance) {
+        for (Method method : clazz.getDeclaredMethods()) {
+            if (Modifier.isPrivate(method.getModifiers())) {
+                if (method.getParameterTypes().length == 0 && method.getReturnType() == Void.TYPE) {
+                    try {
+                        method.setAccessible(true);
+                        method.invoke(instance);
+                    } catch (InvocationTargetException ex) {
+                        throw Throwables.propagate(ex.getCause());
+                    } catch (Exception ex) {
+                        Bukkit.getLogger().log(Level.SEVERE, "Error invoking " + method, ex);
+                    }
+                }
+            }
+        }
+        saveConfig();
+    }
+
+    static void saveConfig() {
+        try {
+            config.save(CONFIG_FILE);
+        } catch (IOException ex) {
+            Bukkit.getLogger().log(Level.SEVERE, "Could not save " + CONFIG_FILE, ex);
+        }
+    }
+
+    private static final Pattern SPACE = Pattern.compile(" ");
+    private static final Pattern NOT_NUMERIC = Pattern.compile("[^-\\d.]");
+    public static int getSeconds(String str) {
+        str = SPACE.matcher(str).replaceAll("");
+        final char unit = str.charAt(str.length() - 1);
+        str = NOT_NUMERIC.matcher(str).replaceAll("");
+        double num;
+        try {
+            num = Double.parseDouble(str);
+        } catch (Exception e) {
+            num = 0D;
+        }
+        switch (unit) {
+            case 'd': num *= (double) 60*60*24; break;
+            case 'h': num *= (double) 60*60; break;
+            case 'm': num *= (double) 60; break;
+            default: case 's': break;
+        }
+        return (int) num;
+    }
+
+    protected static String timeSummary(int seconds) {
+        String time = "";
+
+        if (seconds > 60 * 60 * 24) {
+            time += TimeUnit.SECONDS.toDays(seconds) + "d";
+            seconds %= 60 * 60 * 24;
+        }
+
+        if (seconds > 60 * 60) {
+            time += TimeUnit.SECONDS.toHours(seconds) + "h";
+            seconds %= 60 * 60;
+        }
+
+        if (seconds > 0) {
+            time += TimeUnit.SECONDS.toMinutes(seconds) + "m";
+        }
+        return time;
+    }
+
+    private static void set(String path, Object val) {
+        config.set(path, val);
+    }
+
+    private static boolean getBoolean(String path, boolean def) {
+        config.addDefault(path, def);
+        return config.getBoolean(path, config.getBoolean(path));
+    }
+
+    private static double getDouble(String path, double def) {
+        config.addDefault(path, def);
+        return config.getDouble(path, config.getDouble(path));
+    }
+
+    private static float getFloat(String path, float def) {
+        // TODO: Figure out why getFloat() always returns the default value.
+        return (float) getDouble(path, (double) def);
+    }
+
+    private static int getInt(String path, int def) {
+        config.addDefault(path, def);
+        return config.getInt(path, config.getInt(path));
+    }
+
+    private static <T> List getList(String path, T def) {
+        config.addDefault(path, def);
+        return (List<T>) config.getList(path, config.getList(path));
+    }
+
+    private static String getString(String path, String def) {
+        config.addDefault(path, def);
+        return config.getString(path, config.getString(path));
+    }
+}
diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
new file mode 100644
index 0000000000000000000000000000000000000000..4adf44026fc6269934dfa4513f06a7f8a3b41f90
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -0,0 +1,94 @@
+package com.destroystokyo.paper;
+
+import java.util.List;
+
+import java.util.stream.Collectors;
+import org.bukkit.Bukkit;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.spigotmc.SpigotWorldConfig;
+
+import static com.destroystokyo.paper.PaperConfig.log;
+import static com.destroystokyo.paper.PaperConfig.logError;
+import static com.destroystokyo.paper.PaperConfig.saveConfig;
+
+public class PaperWorldConfig {
+
+    private final String worldName;
+    private final SpigotWorldConfig spigotConfig;
+    private YamlConfiguration config;
+    private boolean verbose;
+
+    public PaperWorldConfig(String worldName, SpigotWorldConfig spigotConfig) {
+        this.worldName = worldName;
+        this.spigotConfig = spigotConfig;
+        this.config = PaperConfig.config;
+        init();
+    }
+
+    public void init() {
+        this.config = PaperConfig.config; // grab updated reference
+        log("-------- World Settings For [" + worldName + "] --------");
+        PaperConfig.readConfig(PaperWorldConfig.class, this);
+    }
+
+    private void set(String path, Object val) {
+        config.set("world-settings.default." + path, val);
+        if (config.get("world-settings." + worldName + "." + path) != null) {
+            config.set("world-settings." + worldName + "." + path, val);
+        }
+    }
+
+    public void removeOldValues() {
+        boolean needsSave = false;
+
+        if (needsSave) {
+            saveConfig();
+        }
+    }
+
+    private boolean getBoolean(String path, boolean def) {
+        config.addDefault("world-settings.default." + path, def);
+        return config.getBoolean("world-settings." + worldName + "." + path, config.getBoolean("world-settings.default." + path));
+    }
+
+    private double getDouble(String path, double def) {
+        config.addDefault("world-settings.default." + path, def);
+        return config.getDouble("world-settings." + worldName + "." + path, config.getDouble("world-settings.default." + path));
+    }
+
+    private int getInt(String path, int def) {
+        return getInt(path, def, true);
+    }
+
+    private int getInt(String path, int def, boolean setDefault) {
+        if (setDefault) {
+            config.addDefault("world-settings.default." + path, def);
+        }
+        return config.getInt("world-settings." + worldName + "." + path, config.getInt("world-settings.default." + path, def));
+    }
+
+    private long getLong(String path, long def) {
+        config.addDefault("world-settings.default." + path, def);
+        return config.getLong("world-settings." + worldName + "." + path, config.getLong("world-settings.default." + path));
+    }
+
+    private float getFloat(String path, float def) {
+        // TODO: Figure out why getFloat() always returns the default value.
+        return (float) getDouble(path, (double) def);
+    }
+
+    private <T> List<T> getList(String path, List<T> def) {
+        config.addDefault("world-settings.default." + path, def);
+        return (List<T>) config.getList("world-settings." + worldName + "." + path, config.getList("world-settings.default." + path));
+    }
+
+    private String getString(String path, String def) {
+        config.addDefault("world-settings.default." + path, def);
+        return config.getString("world-settings." + worldName + "." + path, config.getString("world-settings.default." + path));
+    }
+
+    private <T extends Enum<T>> List<T> getEnumList(String path, List<T> def, Class<T> type) {
+        config.addDefault("world-settings.default." + path, def.stream().map(Enum::name).collect(Collectors.toList()));
+        return ((List<String>) (config.getList("world-settings." + worldName + "." + path, config.getList("world-settings.default." + path)))).stream().map(s -> Enum.valueOf(type, s)).collect(Collectors.toList());
+    }
+}
diff --git a/src/main/java/net/minecraft/server/Main.java b/src/main/java/net/minecraft/server/Main.java
index 82d04f803201e39b48cd514cd8d9e2b90b28c1d4..156fa293626119caf0cf414505fdf0e96eaa08b7 100644
--- a/src/main/java/net/minecraft/server/Main.java
+++ b/src/main/java/net/minecraft/server/Main.java
@@ -106,6 +106,12 @@ public class Main {
             DedicatedServerSettings dedicatedserversettings = new DedicatedServerSettings(optionset); // CraftBukkit - CLI argument support
 
             dedicatedserversettings.forceSave();
+            // Paper start - load config files for access below if needed
+            org.bukkit.configuration.file.YamlConfiguration bukkitConfiguration = loadConfigFile((File) optionset.valueOf("bukkit-settings"));
+            org.bukkit.configuration.file.YamlConfiguration spigotConfiguration = loadConfigFile((File) optionset.valueOf("spigot-settings"));
+            org.bukkit.configuration.file.YamlConfiguration paperConfiguration = loadConfigFile((File) optionset.valueOf("paper-settings"));
+            // Paper end
+
             Path path1 = Paths.get("eula.txt");
             Eula eula = new Eula(path1);
 
@@ -261,6 +267,20 @@ public class Main {
 
     }
 
+    // Paper start - load config files
+    private static org.bukkit.configuration.file.YamlConfiguration loadConfigFile(File configFile) throws Exception {
+        org.bukkit.configuration.file.YamlConfiguration config = new org.bukkit.configuration.file.YamlConfiguration();
+        if (configFile.exists()) {
+            try {
+                config.load(configFile);
+            } catch (Exception ex) {
+                throw new Exception("Failed to load configuration file: " + configFile.getName(), ex);
+            }
+        }
+        return config;
+    }
+    // Paper end
+
     public static void forceUpgrade(LevelStorageSource.LevelStorageAccess session, DataFixer dataFixer, boolean eraseCache, BooleanSupplier continueCheck, WorldGenSettings generatorOptions) {
         Main.LOGGER.info("Forcing world upgrade! {}", session.getLevelId()); // CraftBukkit
         WorldUpgrader worldupgrader = new WorldUpgrader(session, dataFixer, generatorOptions, eraseCache);
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index d75a598576d87644a4226216dcfd685c25b29f12..b3c1373f281adfdd9fa513b597941b60b71bb06c 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -602,6 +602,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
         }
         this.forceDifficulty();
         for (ServerLevel worldserver : this.getAllLevels()) {
+            worldserver.paperConfig.removeOldValues(); // Paper - callback for clearing old config options, after any migrations have taken place
             this.prepareLevels(worldserver.getChunkSource().chunkMap.progressListener, worldserver);
             worldserver.entityManager.tick(); // SPIGOT-6526: Load pending entities so they are available to the API
             this.server.getPluginManager().callEvent(new org.bukkit.event.world.WorldLoadEvent(worldserver.getWorld()));
diff --git a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
index 2599fbabd5e5c0d10d0c915016f7cc982bda0e20..4dd57007af218ba1c0e666117a49939c5884f2c6 100644
--- a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
+++ b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
@@ -192,6 +192,15 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface
         org.spigotmc.SpigotConfig.init((java.io.File) options.valueOf("spigot-settings"));
         org.spigotmc.SpigotConfig.registerCommands();
         // Spigot end
+        // Paper start
+        try {
+            com.destroystokyo.paper.PaperConfig.init((java.io.File) options.valueOf("paper-settings"));
+        } catch (Exception e) {
+            DedicatedServer.LOGGER.error("Unable to load server configuration", e);
+            return false;
+        }
+        com.destroystokyo.paper.PaperConfig.registerCommands();
+        // Paper end
 
         this.setPvpAllowed(dedicatedserverproperties.pvp);
         this.setFlightAllowed(dedicatedserverproperties.allowFlight);
diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
index 183cb57fa8d31bd5d96b0ccef6e79b3d7b9e6c73..0d23c92af7aa381976c45d36e07d965819f19707 100644
--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
@@ -337,6 +337,12 @@ public class ServerChunkCache extends ChunkSource {
         }
     }
 
+    // Paper start - helper
+    public boolean isPositionTicking(Entity entity) {
+        return this.isPositionTicking(ChunkPos.asLong(net.minecraft.util.Mth.floor(entity.getX()) >> 4, net.minecraft.util.Mth.floor(entity.getZ()) >> 4));
+    }
+    // Paper end
+
     public boolean isPositionTicking(long pos) {
         ChunkHolder playerchunk = this.getVisibleChunkIfPresent(pos);
 
diff --git a/src/main/java/net/minecraft/world/entity/EntityType.java b/src/main/java/net/minecraft/world/entity/EntityType.java
index 1bee6fc5b9fa70adf2f7cac792778f5ed203d291..e688949fc2f3031dc9c9817bc59554e9f5a436af 100644
--- a/src/main/java/net/minecraft/world/entity/EntityType.java
+++ b/src/main/java/net/minecraft/world/entity/EntityType.java
@@ -664,4 +664,10 @@ public class EntityType<T extends Entity> implements EntityTypeTest<Entity, T> {
 
         T create(EntityType<T> type, Level world);
     }
+
+    // Paper start
+    public static java.util.Set<ResourceLocation> getEntityNameList() {
+        return Registry.ENTITY_TYPE.keySet();
+    }
+    // Paper end
 }
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index c3afe1e60535241bf5f643034d1858de53e3a422..8de437c79e105331165efaf1b154287e16e1b8ef 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -146,6 +146,8 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
     public boolean populating;
     public final org.spigotmc.SpigotWorldConfig spigotConfig; // Spigot
 
+    public final com.destroystokyo.paper.PaperWorldConfig paperConfig; // Paper
+
     public final SpigotTimings.WorldTimingsHandler timings; // Spigot
     public static BlockPos lastPhysicsProblem; // Spigot
     private org.spigotmc.TickLimiter entityLimiter;
@@ -164,6 +166,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
 
     protected Level(WritableLevelData worlddatamutable, ResourceKey<Level> resourcekey, final DimensionType dimensionmanager, Supplier<ProfilerFiller> supplier, boolean flag, boolean flag1, long i, org.bukkit.generator.ChunkGenerator gen, org.bukkit.generator.BiomeProvider biomeProvider, org.bukkit.World.Environment env) {
         this.spigotConfig = new org.spigotmc.SpigotWorldConfig(((net.minecraft.world.level.storage.PrimaryLevelData) worlddatamutable).getLevelName()); // Spigot
+        this.paperConfig = new com.destroystokyo.paper.PaperWorldConfig(((net.minecraft.world.level.storage.PrimaryLevelData) worlddatamutable).getLevelName(), this.spigotConfig); // Paper
         this.generator = gen;
         this.world = new CraftWorld((ServerLevel) this, gen, biomeProvider, env);
 
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 269f5dd75cc51549af1b50e6ec2dd066ca0dbdf6..355a6af98163079bc60c77d6fb88cd7023264a1b 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -869,6 +869,7 @@ public final class CraftServer implements Server {
         }
 
         org.spigotmc.SpigotConfig.init((File) console.options.valueOf("spigot-settings")); // Spigot
+        com.destroystokyo.paper.PaperConfig.init((File) console.options.valueOf("paper-settings")); // Paper
         for (ServerLevel world : this.console.getAllLevels()) {
             world.serverLevelData.setDifficulty(config.difficulty);
             world.setSpawnSettings(config.spawnMonsters, config.spawnAnimals);
@@ -884,12 +885,14 @@ public final class CraftServer implements Server {
                 }
             }
             world.spigotConfig.init(); // Spigot
+            world.paperConfig.init(); // Paper
         }
 
         this.pluginManager.clearPlugins();
         this.commandMap.clearCommands();
         this.reloadData();
         org.spigotmc.SpigotConfig.registerCommands(); // Spigot
+        com.destroystokyo.paper.PaperConfig.registerCommands(); // Paper
         this.overrideAllCommandBlockCommands = this.commandsConfiguration.getStringList("command-block-overrides").contains("*");
         this.ignoreVanillaPermissions = this.commandsConfiguration.getBoolean("ignore-vanilla-permissions");
 
@@ -2316,4 +2319,35 @@ public final class CraftServer implements Server {
         return this.spigot;
     }
     // 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;
+        }
+    }
+    // Paper end
 }
diff --git a/src/main/java/org/bukkit/craftbukkit/Main.java b/src/main/java/org/bukkit/craftbukkit/Main.java
index 0607f13dd2a568e368f96768259e8cba9c25e9c1..399e878210606e9addb535e4efed0ddb424160e8 100644
--- a/src/main/java/org/bukkit/craftbukkit/Main.java
+++ b/src/main/java/org/bukkit/craftbukkit/Main.java
@@ -129,6 +129,14 @@ public class Main {
                         .defaultsTo(new File("spigot.yml"))
                         .describedAs("Yml file");
                 // Spigot End
+
+                // Paper Start
+                acceptsAll(asList("paper", "paper-settings"), "File for paper settings")
+                        .withRequiredArg()
+                        .ofType(File.class)
+                        .defaultsTo(new File("paper.yml"))
+                        .describedAs("Yml file");
+                // Paper end
             }
         };
 
diff --git a/src/main/java/org/spigotmc/SpigotWorldConfig.java b/src/main/java/org/spigotmc/SpigotWorldConfig.java
index 4520eda5308575aa02ef059bb2efd776f56e352b..1d802f0e81b3880e9bb7799ecd46826f4bdcee03 100644
--- a/src/main/java/org/spigotmc/SpigotWorldConfig.java
+++ b/src/main/java/org/spigotmc/SpigotWorldConfig.java
@@ -58,8 +58,14 @@ public class SpigotWorldConfig
 
     public int getInt(String path, int def)
     {
-        this.config.addDefault( "world-settings.default." + path, def );
-        return this.config.getInt( "world-settings." + this.worldName + "." + path, this.config.getInt( "world-settings.default." + path ) );
+        // Paper start - get int without setting default
+        return this.getInt(path, def, true);
+    }
+    public int getInt(String path, int def, boolean setDef)
+    {
+        if (setDef) this.config.addDefault( "world-settings.default." + path, def );
+        return this.config.getInt( "world-settings." + this.worldName + "." + path, this.config.getInt( "world-settings.default." + path, def ) );
+        // Paper end
     }
 
     public <T> List getList(String path, T def)