Multi-server dispatch support and server run modes

src/main/java/emu/grasscutter/Config.java

 package emu.grasscutter;
 
+import java.util.ArrayList;
+
 public final class Config {
 
 	public String DatabaseUrl = "mongodb://localhost:27017";
@@ -11,6 +13,7 @@ public final class Config {
 	public String DUMPS_FOLDER = "./dumps/";
 	public String KEY_FOLDER = "./keys/";
 
+	public String RunMode = "HYBRID"; // HYBRID, DISPATCH_ONLY, GAME_ONLY
 	public GameServerOptions GameServer = new GameServerOptions();
 	public DispatchServerOptions DispatchServer = new DispatchServerOptions();
 
@@ -30,6 +33,19 @@ public final class Config {
 		public Boolean UseSSL = true;
 
 		public boolean AutomaticallyCreateAccounts = false;
+
+		public RegionInfo[] GameServers = {};
+
+		public RegionInfo[] getGameServers() {
+			return GameServers;
+		}
+
+		public static class RegionInfo {
+			public String Name = "os_usa";
+			public String Title = "Test";
+			public String Ip = "127.0.0.1";
+			public int Port = 22102;
+		}
 	}
 	
 	public static class GameServerOptions {
@@ -38,6 +54,9 @@ public final class Config {
 		public String PublicIp = "";
 		public int Port = 22102;
 
+		public String DispatchServerDatabaseUrl = "mongodb://localhost:27017";
+		public String DispatchServerDatabaseCollection = "grasscutter";
+
 		public boolean LOG_PACKETS = false;
 
 		public int InventoryLimitWeapon = 2000;

src/main/java/emu/grasscutter/Grasscutter.java

@@ -73,11 +73,26 @@ public final class Grasscutter {
 		DatabaseManager.initialize();
 		
 		// Start servers.
+		if(getConfig().RunMode.equalsIgnoreCase("HYBRID")) {
 			dispatchServer = new DispatchServer();
 			dispatchServer.start();
 
 			gameServer = new GameServer(new InetSocketAddress(getConfig().getGameServerOptions().Ip, getConfig().getGameServerOptions().Port));
 			gameServer.start();
+		} else if(getConfig().RunMode.equalsIgnoreCase("DISPATCH_ONLY")) {
+			dispatchServer = new DispatchServer();
+			dispatchServer.start();
+		} else if(getConfig().RunMode.equalsIgnoreCase("GAME_ONLY")) {
+			gameServer = new GameServer(new InetSocketAddress(getConfig().getGameServerOptions().Ip, getConfig().getGameServerOptions().Port));
+			gameServer.start();
+		} else {
+			getLogger().error("Invalid server run mode. " + getConfig().RunMode);
+			getLogger().error("Server run mode must be 'HYBRID', 'DISPATCH_ONLY', or 'GAME_ONLY'. Unable to start Grasscutter...");
+			getLogger().error("Shutting down...");
+			System.exit(1);
+		}
+
+
 		
 		// Open console.
 		startConsole();
@@ -104,9 +119,14 @@ public final class Grasscutter {
 		try (BufferedReader br = new BufferedReader(new InputStreamReader(System.in))) {
 			while ((input = br.readLine()) != null) {
 				try {
+					if(getConfig().RunMode.equalsIgnoreCase("DISPATCH_ONLY")) {
+						getLogger().error("Commands are not supported in dispatch only mode");
+						return;
+					}
 					CommandMap.getInstance().invoke(null, input);
 				} catch (Exception e) {
-					Grasscutter.getLogger().error("Command error: " + e.getMessage());
+					Grasscutter.getLogger().error("Command error: ");
+					e.printStackTrace();
 				}
 			}
 		} catch (Exception e) {

src/main/java/emu/grasscutter/database/DatabaseHelper.java

@@ -74,36 +74,36 @@ public class DatabaseHelper {
 	}
 
 	public static void saveAccount(Account account) {
-		DatabaseManager.getDatastore().save(account);
+		DatabaseManager.getAccountDatastore().save(account);
 	}
 	
 	public static Account getAccountByName(String username) {
-		MorphiaCursor<Account> cursor = DatabaseManager.getDatastore().createQuery(Account.class).field("username").equalIgnoreCase(username).find(FIND_ONE);
+		MorphiaCursor<Account> cursor = DatabaseManager.getAccountDatastore().createQuery(Account.class).field("username").equalIgnoreCase(username).find(FIND_ONE);
 		if (!cursor.hasNext()) return null;
 		return cursor.next();
 	}
 	
 	public static Account getAccountByToken(String token) {
 		if (token == null) return null;
-		MorphiaCursor<Account> cursor = DatabaseManager.getDatastore().createQuery(Account.class).field("token").equal(token).find(FIND_ONE);
+		MorphiaCursor<Account> cursor = DatabaseManager.getAccountDatastore().createQuery(Account.class).field("token").equal(token).find(FIND_ONE);
 		if (!cursor.hasNext()) return null;
 		return cursor.next();
 	}
 	
 	public static Account getAccountById(String uid) {
-		MorphiaCursor<Account> cursor = DatabaseManager.getDatastore().createQuery(Account.class).field("_id").equal(uid).find(FIND_ONE);
+		MorphiaCursor<Account> cursor = DatabaseManager.getAccountDatastore().createQuery(Account.class).field("_id").equal(uid).find(FIND_ONE);
 		if (!cursor.hasNext()) return null;
 		return cursor.next();
 	}
 	
 	public static Account getAccountByPlayerId(int playerId) {
-		MorphiaCursor<Account> cursor = DatabaseManager.getDatastore().createQuery(Account.class).field("playerId").equal(playerId).find(FIND_ONE);
+		MorphiaCursor<Account> cursor = DatabaseManager.getAccountDatastore().createQuery(Account.class).field("playerId").equal(playerId).find(FIND_ONE);
 		if (!cursor.hasNext()) return null;
 		return cursor.next();
 	}
 	
 	public static boolean deleteAccount(String username) {
-		Query<Account> q = DatabaseManager.getDatastore().createQuery(Account.class).field("username").equalIgnoreCase(username);
+		Query<Account> q = DatabaseManager.getAccountDatastore().createQuery(Account.class).field("username").equalIgnoreCase(username);
 		return DatabaseManager.getDatastore().findAndDelete(q) != null;
 	}
 	

src/main/java/emu/grasscutter/database/DatabaseManager.java

@@ -17,7 +17,10 @@ import emu.grasscutter.game.inventory.GenshinItem;
 
 public final class DatabaseManager {
 	private static MongoClient mongoClient;
+	private static MongoClient dispatchMongoClient;
+
 	private static Datastore datastore;
+	private static Datastore dispatchDatastore;
 	
 	private static final Class<?>[] mappedClasses = new Class<?>[] {
 		DatabaseCounter.class, Account.class, GenshinPlayer.class, GenshinAvatar.class, GenshinItem.class, Friendship.class
@@ -35,9 +38,19 @@ public final class DatabaseManager {
     	return getDatastore().getDatabase();
     }
 
+	// Yes. I very dislike this method also but I'm lazy. Probably replace it by making the game server connect to the dispatch server instead.
+	public static Datastore getAccountDatastore() {
+		if(Grasscutter.getConfig().RunMode.equalsIgnoreCase("GAME_ONLY")) {
+			return dispatchDatastore;
+		} else {
+			return datastore;
+		}
+	}
+	
 	public static void initialize() {
 		// Initialize
 		mongoClient = new MongoClient(new MongoClientURI(Grasscutter.getConfig().DatabaseUrl));
+		dispatchMongoClient = new MongoClient(new MongoClientURI(Grasscutter.getConfig().getGameServerOptions().DispatchServerDatabaseUrl));
 		Morphia morphia = new Morphia();
 		
 		// TODO Update when migrating to Morphia 2.0
@@ -50,6 +63,7 @@ public final class DatabaseManager {
 		
 		// Build datastore
 		datastore = morphia.createDatastore(mongoClient, Grasscutter.getConfig().DatabaseCollection);
+		dispatchDatastore = morphia.createDatastore(dispatchMongoClient, Grasscutter.getConfig().getGameServerOptions().DispatchServerDatabaseCollection);
 		
 		// Ensure indexes
 		try {
@@ -67,6 +81,23 @@ public final class DatabaseManager {
 				datastore.ensureIndexes();
 			}
 		}
+
+		// Ensure indexes for dispatch server
+		try {
+			dispatchDatastore.ensureIndexes();
+		} catch (MongoCommandException e) {
+			Grasscutter.getLogger().info("Mongo index error: ", e);
+			// Duplicate index error
+			if (e.getCode() == 85) {
+				// Drop all indexes and re add them
+				MongoIterable<String> collections = dispatchDatastore.getDatabase().listCollectionNames();
+				for (String name : collections) {
+					dispatchDatastore.getDatabase().getCollection(name).dropIndexes();
+				}
+				// Add back indexes
+				dispatchDatastore.ensureIndexes();
+			}
+		}
 	}
 	
 	public static synchronized int getNextId(Class<?> c) {

src/main/java/emu/grasscutter/server/dispatch/DispatchServer.java

@@ -9,10 +9,7 @@ import java.net.InetSocketAddress;
 import java.net.URI;
 import java.net.URLDecoder;
 import java.security.KeyStore;
-import java.util.Base64;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
+import java.util.*;
 
 import javax.net.ssl.KeyManagerFactory;
 import javax.net.ssl.SSLContext;
@@ -25,6 +22,7 @@ import com.sun.net.httpserver.HttpHandler;
 import com.sun.net.httpserver.HttpsConfigurator;
 import com.sun.net.httpserver.HttpsServer;
 
+import emu.grasscutter.Config;
 import emu.grasscutter.Grasscutter;
 import emu.grasscutter.database.DatabaseHelper;
 import emu.grasscutter.game.Account;
@@ -46,15 +44,18 @@ import com.sun.net.httpserver.HttpServer;
 public final class DispatchServer {
 	private final InetSocketAddress address;
 	private final Gson gson;
-	private QueryCurrRegionHttpRsp currRegion;
+	//private QueryCurrRegionHttpRsp currRegion;
 	
 	public String regionListBase64;
-	public String regionCurrentBase64;
+	public HashMap<String, RegionData> regions;
+	public HashMap<InetSocketAddress, String> usersIngame;
 
 	public static String query_region_list = "";
 	public static String query_cur_region = "";
 
 	public DispatchServer() {
+		this.regions = new HashMap<String, RegionData>();
+		this.usersIngame = new HashMap<InetSocketAddress, String>();
 		this.address = new InetSocketAddress(Grasscutter.getConfig().getDispatchOptions().Ip, Grasscutter.getConfig().getDispatchOptions().Port);
 		this.gson = new GsonBuilder().create();
 		
@@ -70,8 +71,13 @@ public final class DispatchServer {
 		return gson;
 	}
 
-	public QueryCurrRegionHttpRsp getCurrRegion() {
-		return currRegion;
+	public QueryCurrRegionHttpRsp getCurrRegion(InetSocketAddress address) {
+		if(usersIngame.containsKey(address)) {
+			return regions.get(usersIngame.get(address)).parsedRegionQuery;
+		}
+
+		Grasscutter.getLogger().error("User is not logged in to dispatch server. " + address.getAddress() + ":" + address.getPort());
+		return null;
 	}
 	
 	public void loadQueries() {
@@ -100,39 +106,67 @@ public final class DispatchServer {
 			byte[] decoded2 = Base64.getDecoder().decode(query_cur_region);
 			QueryCurrRegionHttpRsp regionQuery = QueryCurrRegionHttpRsp.parseFrom(decoded2);
 
+			List<RegionSimpleInfo> servers = new ArrayList<RegionSimpleInfo>();
+			List<String> usedNames = new ArrayList<String>(); // List to check for potential naming conflicts
+			if(Grasscutter.getConfig().RunMode.equalsIgnoreCase("HYBRID")) { // Automatically add the game server if in hybrid mode
+				String defaultServerName = "os_usa";
 				RegionSimpleInfo server = RegionSimpleInfo.newBuilder()
 						.setName("os_usa")
 						.setTitle(Grasscutter.getConfig().getGameServerOptions().Name)
 						.setType("DEV_PUBLIC")
-					.setDispatchUrl("https://" + (Grasscutter.getConfig().getDispatchOptions().PublicIp.isEmpty() ? Grasscutter.getConfig().getDispatchOptions().Ip : Grasscutter.getConfig().getDispatchOptions().PublicIp) + ":" + getAddress().getPort() + "/query_cur_region")
+						.setDispatchUrl("https://" + (Grasscutter.getConfig().getDispatchOptions().PublicIp.isEmpty() ? Grasscutter.getConfig().getDispatchOptions().Ip : Grasscutter.getConfig().getDispatchOptions().PublicIp) + ":" + getAddress().getPort() + "/query_cur_region_" + defaultServerName)
 						.build();
+				usedNames.add(defaultServerName);
+				servers.add(server);
+
+				RegionInfo serverRegion = regionQuery.getRegionInfo().toBuilder()
+						.setIp((Grasscutter.getConfig().getGameServerOptions().PublicIp.isEmpty() ? Grasscutter.getConfig().getGameServerOptions().Ip : Grasscutter.getConfig().getGameServerOptions().PublicIp))
+						.setPort(Grasscutter.getConfig().getGameServerOptions().Port)
+						.setSecretKey(ByteString.copyFrom(FileUtils.read(Grasscutter.getConfig().KEY_FOLDER + "dispatchSeed.bin")))
+						.build();
+
+				QueryCurrRegionHttpRsp parsedRegionQuery = regionQuery.toBuilder().setRegionInfo(serverRegion).build();
+				regions.put(defaultServerName, new RegionData(parsedRegionQuery, Base64.getEncoder().encodeToString(parsedRegionQuery.toByteString().toByteArray())));
+
+			} else {
+				if(Grasscutter.getConfig().getDispatchOptions().getGameServers().length == 0) {
+					Grasscutter.getLogger().error("Dispatch server has no game servers available. Exiting due to unplayable state.");
+					System.exit(1);
+				}
+			}
 
-			RegionSimpleInfo serverTest2 = RegionSimpleInfo.newBuilder()
-					.setName("os_euro")
-					.setTitle("Grasscutter")
+			for (Config.DispatchServerOptions.RegionInfo regionInfo : Grasscutter.getConfig().getDispatchOptions().getGameServers()) {
+				if(usedNames.contains(regionInfo.Name)) {
+					Grasscutter.getLogger().error("Region name already in use.");
+					continue;
+				}
+				RegionSimpleInfo server = RegionSimpleInfo.newBuilder()
+						.setName(regionInfo.Name)
+						.setTitle(regionInfo.Title)
 						.setType("DEV_PUBLIC")
-					.setDispatchUrl("https://" + (Grasscutter.getConfig().getDispatchOptions().PublicIp.isEmpty() ? Grasscutter.getConfig().getDispatchOptions().Ip : Grasscutter.getConfig().getDispatchOptions().PublicIp) + ":" + getAddress().getPort() + "/query_cur_region")
+						.setDispatchUrl("https://" + (Grasscutter.getConfig().getDispatchOptions().PublicIp.isEmpty() ? Grasscutter.getConfig().getDispatchOptions().Ip : Grasscutter.getConfig().getDispatchOptions().PublicIp) + ":" + getAddress().getPort() + "/query_cur_region_" + regionInfo.Name)
 						.build();
+				usedNames.add(regionInfo.Name);
+				servers.add(server);
+
+				RegionInfo serverRegion = regionQuery.getRegionInfo().toBuilder()
+						.setIp(regionInfo.Ip)
+						.setPort(regionInfo.Port)
+						.setSecretKey(ByteString.copyFrom(FileUtils.read(Grasscutter.getConfig().KEY_FOLDER + "dispatchSeed.bin")))
+						.build();
+
+				QueryCurrRegionHttpRsp parsedRegionQuery = regionQuery.toBuilder().setRegionInfo(serverRegion).build();
+				regions.put(regionInfo.Name, new RegionData(parsedRegionQuery, Base64.getEncoder().encodeToString(parsedRegionQuery.toByteString().toByteArray())));
+			}
 
 			QueryRegionListHttpRsp regionList = QueryRegionListHttpRsp.newBuilder()
-				.addServers(server)
-				.addServers(serverTest2)
+				.addAllServers(servers)
 				.setClientSecretKey(rl.getClientSecretKey())
 			    .setClientCustomConfigEncrypted(rl.getClientCustomConfigEncrypted())
 			    .setEnableLoginPc(true)
 				.build();
 
-			RegionInfo currentRegion = regionQuery.getRegionInfo().toBuilder()
-					.setIp((Grasscutter.getConfig().getGameServerOptions().PublicIp.isEmpty() ? Grasscutter.getConfig().getGameServerOptions().Ip : Grasscutter.getConfig().getGameServerOptions().PublicIp))
-					.setPort(Grasscutter.getConfig().getGameServerOptions().Port)
-					.setSecretKey(ByteString.copyFrom(FileUtils.read(Grasscutter.getConfig().KEY_FOLDER + "dispatchSeed.bin")))
-					.build();
-			
-			QueryCurrRegionHttpRsp parsedRegionQuery = regionQuery.toBuilder().setRegionInfo(currentRegion).build();
-
 			this.regionListBase64 = Base64.getEncoder().encodeToString(regionList.toByteString().toByteArray());
-			this.regionCurrentBase64 = Base64.getEncoder().encodeToString(parsedRegionQuery.toByteString().toByteArray());
-			this.currRegion = parsedRegionQuery;
 		} catch (Exception e) {
 			Grasscutter.getLogger().error("Error while initializing region info!", e);
 		}
@@ -188,10 +222,18 @@ public final class DispatchServer {
 			OutputStream os = t.getResponseBody();
 			os.write(response.getBytes());
 			os.close();
+
+			if(usersIngame.containsKey(t.getRemoteAddress())) {
+				usersIngame.remove(t.getRemoteAddress());
+			}
 		});
-		server.createContext("/query_cur_region", t -> {
+
+		for (String regionName : regions.keySet()) {
+			server.createContext("/query_cur_region_" + regionName, t -> {
+				String regionCurrentBase64 = regions.get(regionName).Base64;
+
 				// Log
-			Grasscutter.getLogger().info("Client request: query_cur_region");
+				Grasscutter.getLogger().info("Client request: query_cur_region_" + regionName);
 				// Create a response form the request query parameters
 				URI uri = t.getRequestURI();
 				String response = "CAESGE5vdCBGb3VuZCB2ZXJzaW9uIGNvbmZpZw==";
@@ -205,7 +247,11 @@ public final class DispatchServer {
 				OutputStream os = t.getResponseBody();
 				os.write(response.getBytes());
 				os.close();
+				//Save region info to hashmap for user, this for getCurrRegion();
+				usersIngame.put(t.getRemoteAddress(), regionName);
 			});
+		}
+
 		// Login via account
 		server.createContext("/hk4e_global/mdk/shield/api/login", t -> {
 			// Get post data
@@ -464,4 +510,15 @@ public final class DispatchServer {
 	    }
 	    return result;
 	}
+
+	public static class RegionData {
+
+		QueryCurrRegionHttpRsp parsedRegionQuery;
+		String Base64;
+
+		public RegionData(QueryCurrRegionHttpRsp prq, String b64) {
+			this.parsedRegionQuery = prq;
+			this.Base64 = b64;
+		}
+	}
 }

src/main/java/emu/grasscutter/server/packet/send/PacketPlayerLoginRsp.java

@@ -14,7 +14,7 @@ public class PacketPlayerLoginRsp extends GenshinPacket {
 		
 		this.setUseDispatchKey(true);
 		
-		RegionInfo info = Grasscutter.getDispatchServer().getCurrRegion().getRegionInfo();
+		RegionInfo info = Grasscutter.getDispatchServer().getCurrRegion(session.getAddress()).getRegionInfo();
 		
 		PlayerLoginRsp p = PlayerLoginRsp.newBuilder()
 				.setIsUseAbilityHash(true) // true