src/game/java/net/minecraft/server/Main.java

package net.minecraft.server;

import com.mojang.authlib.yggdrasil.YggdrasilAuthenticationService;
import com.mojang.datafixers.DataFixer;
import com.mojang.logging.LogUtils;
import com.mojang.serialization.Dynamic;
import com.mojang.serialization.Lifecycle;
import java.awt.GraphicsEnvironment;
import java.io.File;
import java.io.IOException;
import java.io.UncheckedIOException;
import java.net.Proxy;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Optional;
import java.util.concurrent.Executor;
import java.util.function.BooleanSupplier;
import javax.annotation.Nullable;
import joptsimple.OptionParser;
import joptsimple.OptionSet;
import joptsimple.OptionSpec;
import joptsimple.util.PathConverter;
import net.minecraft.CrashReport;
import net.minecraft.DefaultUncaughtExceptionHandler;
import net.minecraft.SharedConstants;
import net.minecraft.SuppressForbidden;
import net.minecraft.Util;
import net.minecraft.commands.Commands;
import net.minecraft.core.Registry;
import net.minecraft.core.RegistryAccess;
import net.minecraft.core.registries.Registries;
import net.minecraft.nbt.NbtException;
import net.minecraft.nbt.ReportedNbtException;
import net.minecraft.network.chat.Component;
import net.minecraft.obfuscate.DontObfuscate;
import net.minecraft.server.dedicated.DedicatedServer;
import net.minecraft.server.dedicated.DedicatedServerProperties;
import net.minecraft.server.dedicated.DedicatedServerSettings;
import net.minecraft.server.level.progress.LoggerChunkProgressListener;
import net.minecraft.server.packs.repository.PackRepository;
import net.minecraft.server.packs.repository.ServerPacksSource;
import net.minecraft.util.Mth;
import net.minecraft.util.datafix.DataFixers;
import net.minecraft.util.profiling.jfr.Environment;
import net.minecraft.util.profiling.jfr.JvmProfiler;
import net.minecraft.util.worldupdate.WorldUpgrader;
import net.minecraft.world.flag.FeatureFlags;
import net.minecraft.world.level.GameRules;
import net.minecraft.world.level.LevelSettings;
import net.minecraft.world.level.WorldDataConfiguration;
import net.minecraft.world.level.chunk.storage.RegionFileVersion;
import net.minecraft.world.level.dimension.LevelStem;
import net.minecraft.world.level.levelgen.WorldDimensions;
import net.minecraft.world.level.levelgen.WorldOptions;
import net.minecraft.world.level.levelgen.presets.WorldPresets;
import net.minecraft.world.level.storage.LevelDataAndDimensions;
import net.minecraft.world.level.storage.LevelStorageSource;
import net.minecraft.world.level.storage.LevelSummary;
import net.minecraft.world.level.storage.PrimaryLevelData;
import net.minecraft.world.level.storage.WorldData;
import org.slf4j.Logger;

public class Main {
    private static final Logger LOGGER = LogUtils.getLogger();

    @SuppressForbidden(
        reason = "System.out needed before bootstrap"
    )
    @DontObfuscate
    public static void main(String[] p_129699_) {
        SharedConstants.tryDetectVersion();
        OptionParser optionparser = new OptionParser();
        OptionSpec<Void> optionspec = optionparser.accepts("nogui");
        OptionSpec<Void> optionspec1 = optionparser.accepts("initSettings", "Initializes 'server.properties' and 'eula.txt', then quits");
        OptionSpec<Void> optionspec2 = optionparser.accepts("demo");
        OptionSpec<Void> optionspec3 = optionparser.accepts("bonusChest");
        OptionSpec<Void> optionspec4 = optionparser.accepts("forceUpgrade");
        OptionSpec<Void> optionspec5 = optionparser.accepts("eraseCache");
        OptionSpec<Void> optionspec6 = optionparser.accepts("recreateRegionFiles");
        OptionSpec<Void> optionspec7 = optionparser.accepts("safeMode", "Loads level with vanilla datapack only");
        OptionSpec<Void> optionspec8 = optionparser.accepts("help").forHelp();
        OptionSpec<String> optionspec9 = optionparser.accepts("universe").withRequiredArg().defaultsTo(".");
        OptionSpec<String> optionspec10 = optionparser.accepts("world").withRequiredArg();
        OptionSpec<Integer> optionspec11 = optionparser.accepts("port").withRequiredArg().ofType(Integer.class).defaultsTo(-1);
        OptionSpec<String> optionspec12 = optionparser.accepts("serverId").withRequiredArg();
        OptionSpec<Void> optionspec13 = optionparser.accepts("jfrProfile");
        OptionSpec<Path> optionspec14 = optionparser.accepts("pidFile").withRequiredArg().withValuesConvertedBy(new PathConverter());
        OptionSpec<String> optionspec15 = optionparser.nonOptions();

        try {
            OptionSet optionset = optionparser.parse(p_129699_);
            if (optionset.has(optionspec8)) {
                optionparser.printHelpOn(System.err);
                return;
            }

            Path path = optionset.valueOf(optionspec14);
            if (path != null) {
                writePidFile(path);
            }

            CrashReport.preload();
            if (optionset.has(optionspec13)) {
                JvmProfiler.INSTANCE.start(Environment.SERVER);
            }

            Bootstrap.bootStrap();
            Bootstrap.validate();
            Util.startTimerHackThread();
            Path path1 = Paths.get("server.properties");
            DedicatedServerSettings dedicatedserversettings = new DedicatedServerSettings(path1);
            dedicatedserversettings.forceSave();
            RegionFileVersion.configure(dedicatedserversettings.getProperties().regionFileComression);
            Path path2 = Paths.get("eula.txt");
            Eula eula = new Eula(path2);
            if (optionset.has(optionspec1)) {
                LOGGER.info("Initialized '{}' and '{}'", path1.toAbsolutePath(), path2.toAbsolutePath());
                return;
            }

            if (!eula.hasAgreedToEULA()) {
                LOGGER.info("You need to agree to the EULA in order to run the server. Go to eula.txt for more info.");
                return;
            }

            File file1 = new File(optionset.valueOf(optionspec9));
            Services services = Services.create(new YggdrasilAuthenticationService(Proxy.NO_PROXY), file1);
            String s = Optional.ofNullable(optionset.valueOf(optionspec10)).orElse(dedicatedserversettings.getProperties().levelName);
            LevelStorageSource levelstoragesource = LevelStorageSource.createDefault(file1.toPath());
            LevelStorageSource.LevelStorageAccess levelstoragesource$levelstorageaccess = levelstoragesource.validateAndCreateAccess(s);
            Dynamic<?> dynamic;
            if (levelstoragesource$levelstorageaccess.hasWorldData()) {
                LevelSummary levelsummary;
                try {
                    dynamic = levelstoragesource$levelstorageaccess.getDataTag();
                    levelsummary = levelstoragesource$levelstorageaccess.getSummary(dynamic);
                } catch (NbtException | ReportedNbtException | IOException ioexception1) {
                    LevelStorageSource.LevelDirectory levelstoragesource$leveldirectory = levelstoragesource$levelstorageaccess.getLevelDirectory();
                    LOGGER.warn("Failed to load world data from {}", levelstoragesource$leveldirectory.dataFile(), ioexception1);
                    LOGGER.info("Attempting to use fallback");

                    try {
                        dynamic = levelstoragesource$levelstorageaccess.getDataTagFallback();
                        levelsummary = levelstoragesource$levelstorageaccess.getSummary(dynamic);
                    } catch (NbtException | ReportedNbtException | IOException ioexception) {
                        LOGGER.error("Failed to load world data from {}", levelstoragesource$leveldirectory.oldDataFile(), ioexception);
                        LOGGER.error(
                            "Failed to load world data from {} and {}. World files may be corrupted. Shutting down.",
                            levelstoragesource$leveldirectory.dataFile(),
                            levelstoragesource$leveldirectory.oldDataFile()
                        );
                        return;
                    }

                    levelstoragesource$levelstorageaccess.restoreLevelDataFromOld();
                }

                if (levelsummary.requiresManualConversion()) {
                    LOGGER.info("This world must be opened in an older version (like 1.6.4) to be safely converted");
                    return;
                }

                if (!levelsummary.isCompatible()) {
                    LOGGER.info("This world was created by an incompatible version.");
                    return;
                }
            } else {
                dynamic = null;
            }

            Dynamic<?> dynamic1 = dynamic;
            boolean flag = optionset.has(optionspec7);
            if (flag) {
                LOGGER.warn("Safe mode active, only vanilla datapack will be loaded");
            }

            PackRepository packrepository = ServerPacksSource.createPackRepository(levelstoragesource$levelstorageaccess);

            WorldStem worldstem;
            try {
                WorldLoader.InitConfig worldloader$initconfig = loadOrCreateConfig(dedicatedserversettings.getProperties(), dynamic1, flag, packrepository);
                worldstem = Util.<WorldStem>blockUntilDone(
                        p_358505_ -> WorldLoader.load(
                                worldloader$initconfig,
                                p_358511_ -> {
                                    Registry<LevelStem> registry = p_358511_.datapackDimensions().lookupOrThrow(Registries.LEVEL_STEM);
                                    if (dynamic1 != null) {
                                        LevelDataAndDimensions leveldataanddimensions = LevelStorageSource.getLevelDataAndDimensions(
                                            dynamic1, p_358511_.dataConfiguration(), registry, p_358511_.datapackWorldgen()
                                        );
                                        return new WorldLoader.DataLoadOutput<>(
                                            leveldataanddimensions.worldData(), leveldataanddimensions.dimensions().dimensionsRegistryAccess()
                                        );
                                    } else {
                                        LOGGER.info("No existing world data, creating new world");
                                        LevelSettings levelsettings;
                                        WorldOptions worldoptions;
                                        WorldDimensions worlddimensions;
                                        if (optionset.has(optionspec2)) {
                                            levelsettings = MinecraftServer.DEMO_SETTINGS;
                                            worldoptions = WorldOptions.DEMO_OPTIONS;
                                            worlddimensions = WorldPresets.createNormalWorldDimensions(p_358511_.datapackWorldgen());
                                        } else {
                                            DedicatedServerProperties dedicatedserverproperties = dedicatedserversettings.getProperties();
                                            levelsettings = new LevelSettings(
                                                dedicatedserverproperties.levelName,
                                                dedicatedserverproperties.gamemode,
                                                dedicatedserverproperties.hardcore,
                                                dedicatedserverproperties.difficulty,
                                                false,
                                                new GameRules(p_358511_.dataConfiguration().enabledFeatures()),
                                                p_358511_.dataConfiguration()
                                            );
                                            worldoptions = optionset.has(optionspec3)
                                                ? dedicatedserverproperties.worldOptions.withBonusChest(true)
                                                : dedicatedserverproperties.worldOptions;
                                            worlddimensions = dedicatedserverproperties.createDimensions(p_358511_.datapackWorldgen());
                                        }

                                        WorldDimensions.Complete worlddimensions$complete = worlddimensions.bake(registry);
                                        Lifecycle lifecycle = worlddimensions$complete.lifecycle().add(p_358511_.datapackWorldgen().allRegistriesLifecycle());
                                        return new WorldLoader.DataLoadOutput<>(
                                            new PrimaryLevelData(levelsettings, worldoptions, worlddimensions$complete.specialWorldProperty(), lifecycle),
                                            worlddimensions$complete.dimensionsRegistryAccess()
                                        );
                                    }
                                },
                                WorldStem::new,
                                Util.backgroundExecutor(),
                                p_358505_
                            )
                    )
                    .get();
            } catch (Exception exception) {
                LOGGER.warn(
                    "Failed to load datapacks, can't proceed with server load. You can either fix your datapacks or reset to vanilla with --safeMode",
                    (Throwable)exception
                );
                return;
            }

            RegistryAccess.Frozen registryaccess$frozen = worldstem.registries().compositeAccess();
            boolean flag1 = optionset.has(optionspec6);
            if (optionset.has(optionspec4) || flag1) {
                forceUpgrade(levelstoragesource$levelstorageaccess, DataFixers.getDataFixer(), optionset.has(optionspec5), () -> true, registryaccess$frozen, flag1);
            }

            WorldData worlddata = worldstem.worldData();
            levelstoragesource$levelstorageaccess.saveDataTag(registryaccess$frozen, worlddata);
            final DedicatedServer dedicatedserver = MinecraftServer.spin(
                p_296433_ -> {
                    DedicatedServer dedicatedserver1 = new DedicatedServer(
                        p_296433_,
                        levelstoragesource$levelstorageaccess,
                        packrepository,
                        worldstem,
                        dedicatedserversettings,
                        DataFixers.getDataFixer(),
                        services,
                        LoggerChunkProgressListener::createFromGameruleRadius
                    );
                    dedicatedserver1.setPort(optionset.valueOf(optionspec11));
                    dedicatedserver1.setDemo(optionset.has(optionspec2));
                    dedicatedserver1.setId(optionset.valueOf(optionspec12));
                    boolean flag2 = !optionset.has(optionspec) && !optionset.valuesOf(optionspec15).contains("nogui");
                    if (flag2 && !GraphicsEnvironment.isHeadless()) {
                        dedicatedserver1.showGui();
                    }

                    return dedicatedserver1;
                }
            );
            Thread thread = new Thread("Server Shutdown Thread") {
                @Override
                public void run() {
                    dedicatedserver.halt(true);
                }
            };
            thread.setUncaughtExceptionHandler(new DefaultUncaughtExceptionHandler(LOGGER));
            Runtime.getRuntime().addShutdownHook(thread);
        } catch (Exception exception1) {
            LOGGER.error(LogUtils.FATAL_MARKER, "Failed to start the minecraft server", (Throwable)exception1);
        }
    }

    private static void writePidFile(Path p_270192_) {
        try {
            long i = ProcessHandle.current().pid();
            Files.writeString(p_270192_, Long.toString(i));
        } catch (IOException ioexception) {
            throw new UncheckedIOException(ioexception);
        }
    }

    private static WorldLoader.InitConfig loadOrCreateConfig(
        DedicatedServerProperties p_248563_, @Nullable Dynamic<?> p_310940_, boolean p_249093_, PackRepository p_251069_
    ) {
        boolean flag;
        WorldDataConfiguration worlddataconfiguration;
        if (p_310940_ != null) {
            WorldDataConfiguration worlddataconfiguration1 = LevelStorageSource.readDataConfig(p_310940_);
            flag = false;
            worlddataconfiguration = worlddataconfiguration1;
        } else {
            flag = true;
            worlddataconfiguration = new WorldDataConfiguration(p_248563_.initialDataPackConfiguration, FeatureFlags.DEFAULT_FLAGS);
        }

        WorldLoader.PackConfig worldloader$packconfig = new WorldLoader.PackConfig(p_251069_, worlddataconfiguration, p_249093_, flag);
        return new WorldLoader.InitConfig(worldloader$packconfig, Commands.CommandSelection.DEDICATED, p_248563_.functionPermissionLevel);
    }

    private static void forceUpgrade(
        LevelStorageSource.LevelStorageAccess p_195489_,
        DataFixer p_195490_,
        boolean p_195491_,
        BooleanSupplier p_195492_,
        RegistryAccess p_332212_,
        boolean p_331291_
    ) {
        LOGGER.info("Forcing world upgrade!");

        try (WorldUpgrader worldupgrader = new WorldUpgrader(p_195489_, p_195490_, p_332212_, p_195491_, p_331291_)) {
            Component component = null;

            while (!worldupgrader.isFinished()) {
                Component component1 = worldupgrader.getStatus();
                if (component != component1) {
                    component = component1;
                    LOGGER.info(worldupgrader.getStatus().getString());
                }

                int i = worldupgrader.getTotalChunks();
                if (i > 0) {
                    int j = worldupgrader.getConverted() + worldupgrader.getSkipped();
                    LOGGER.info("{}% completed ({} / {} chunks)...", Mth.floor((float)j / (float)i * 100.0F), j, i);
                }

                if (!p_195492_.getAsBoolean()) {
                    worldupgrader.cancel();
                } else {
                    try {
                        Thread.sleep(1000L);
                    } catch (InterruptedException interruptedexception) {
                    }
                }
            }
        }
    }
}