Refactor `PacketOpcodesUtil` to be more... useful

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

@@ -5,7 +5,6 @@ import ch.qos.logback.classic.Logger;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 
-import emu.grasscutter.Grasscutter.ServerDebugMode;
 import emu.grasscutter.auth.AuthenticationSystem;
 import emu.grasscutter.auth.DefaultAuthentication;
 import emu.grasscutter.command.CommandMap;
@@ -14,6 +13,7 @@ import emu.grasscutter.command.PermissionHandler;
 import emu.grasscutter.config.ConfigContainer;
 import emu.grasscutter.data.ResourceLoader;
 import emu.grasscutter.database.DatabaseManager;
+import emu.grasscutter.net.packet.PacketOpcodesUtils;
 import emu.grasscutter.plugin.PluginManager;
 import emu.grasscutter.plugin.api.ServerHook;
 import emu.grasscutter.scripts.ScriptLoader;
@@ -98,6 +98,10 @@ public final class Grasscutter {
                     Tools.createGmHandbook();
                     exitEarly = true;
                 }
+                case "-dumppacketids" -> {
+                    PacketOpcodesUtils.dumpPacketIds();
+                    exitEarly = true;
+                }
                 case "-gachamap" -> {
                     Tools.createGachaMapping(DATA("gacha_mappings.js"));
                     exitEarly = true;

src/main/java/emu/grasscutter/net/packet/PacketOpcodes.java

 package emu.grasscutter.net.packet;
 
-import java.util.HashSet;
-
 public class PacketOpcodes {
   // Empty
     public static final int  NONE = 0;
@@ -1856,12 +1854,4 @@ public class PacketOpcodes {
     public static final int WorldRoutineTypeCloseNotify = 3502;
     public static final int WorldRoutineTypeRefreshNotify = 3525;
 
-  // Unknown
-
-    public static final HashSet<Integer> BANNED_PACKETS = new HashSet<>() {
-        {
-            this.add(PacketOpcodes.WindSeedClientNotify);
-            this.add(PacketOpcodes.PlayerLuaShellNotify);
-        }
-    };
 }
\ No newline at end of file

src/main/java/emu/grasscutter/net/packet/PacketOpcodesUtil.java → src/main/java/emu/grasscutter/net/packet/PacketOpcodesUtils.java

@@ -4,13 +4,33 @@ import java.io.BufferedWriter;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.lang.reflect.Field;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.stream.Collectors;
 
+import emu.grasscutter.GameConstants;
+import emu.grasscutter.Grasscutter;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
 
-public class PacketOpcodesUtil {
+public class PacketOpcodesUtils {
     private static Int2ObjectMap<String> opcodeMap;
 
+    public static final Set<Integer> BANNED_PACKETS = Set.of(
+        PacketOpcodes.WindSeedClientNotify,
+        PacketOpcodes.PlayerLuaShellNotify
+    );
+    
+    public static final Set<Integer> LOOP_PACKETS = Set.of(
+        PacketOpcodes.PingReq,
+        PacketOpcodes.PingRsp,
+        PacketOpcodes.WorldPlayerRTTNotify,
+        PacketOpcodes.UnionCmdNotify,
+        PacketOpcodes.QueryPathReq
+    );
+	
 	static {
 		opcodeMap = new Int2ObjectOpenHashMap<String>();
 
@@ -32,13 +52,15 @@ public class PacketOpcodesUtil {
 		return opcodeMap.getOrDefault(opcode, "UNKNOWN");
 	}
 
-	public static void dumpOpcodes() {
-		try {
-			BufferedWriter out = new BufferedWriter(new FileWriter("opcodes.ini"));
-			for (Int2ObjectMap.Entry<String> entry : opcodeMap.int2ObjectEntrySet()) {
-				out.write(String.format("%04X=%s%s", entry.getIntKey(), entry.getValue(), System.lineSeparator()));
-			}
-			out.close();
+	public static void dumpPacketIds() {
+	    try (FileWriter writer = new FileWriter("./PacketIds_" + GameConstants.VERSION + ".json")) {
+	        // Create sorted tree map
+	        Map<Integer, String> packetIds = opcodeMap.int2ObjectEntrySet().stream()
+	                .filter(e -> e.getIntKey() > 0)
+	                .collect(Collectors.toMap(Int2ObjectMap.Entry::getIntKey, Int2ObjectMap.Entry::getValue, (k, v) -> v, TreeMap::new));
+	        // Write to file
+			writer.write(Grasscutter.getGsonFactory().toJson(packetIds));
+			Grasscutter.getLogger().info("Dumped packet ids.");
 		} catch (IOException e) {
 			e.printStackTrace();
 		}

src/main/java/emu/grasscutter/server/game/GameServerPacketHandler.java

@@ -95,7 +95,7 @@ public class GameServerPacketHandler {
 
 		// Log unhandled packets
 		if (GAME_INFO.logPackets == ServerDebugMode.MISSING) {
-			Grasscutter.getLogger().info("Unhandled packet (" + opcode + "): " + emu.grasscutter.net.packet.PacketOpcodesUtil.getOpcodeName(opcode));
+			Grasscutter.getLogger().info("Unhandled packet (" + opcode + "): " + emu.grasscutter.net.packet.PacketOpcodesUtils.getOpcodeName(opcode));
 		}
 	}
 }

src/main/java/emu/grasscutter/server/game/GameSession.java

@@ -9,7 +9,7 @@ import emu.grasscutter.game.Account;
 import emu.grasscutter.game.player.Player;
 import emu.grasscutter.net.packet.BasePacket;
 import emu.grasscutter.net.packet.PacketOpcodes;
-import emu.grasscutter.net.packet.PacketOpcodesUtil;
+import emu.grasscutter.net.packet.PacketOpcodesUtils;
 import emu.grasscutter.server.event.game.SendPacketEvent;
 import emu.grasscutter.utils.Crypto;
 import emu.grasscutter.utils.FileUtils;
@@ -126,7 +126,7 @@ public class GameSession implements GameSessionManager.KcpChannel {
     }
 
     public void logPacket( String sendOrRecv, int opcode, byte[] payload) {
-        Grasscutter.getLogger().info(sendOrRecv + ": " + PacketOpcodesUtil.getOpcodeName(opcode) + " (" + opcode + ")");
+        Grasscutter.getLogger().info(sendOrRecv + ": " + PacketOpcodesUtils.getOpcodeName(opcode) + " (" + opcode + ")");
         System.out.println(Utils.bytesToHex(payload));
     }
     public void send(BasePacket packet) {
@@ -138,7 +138,7 @@ public class GameSession implements GameSessionManager.KcpChannel {
 
 		// DO NOT REMOVE (unless we find a way to validate code before sending to client which I don't think we can)
 		// Stop WindSeedClientNotify from being sent for security purposes.
-		if(PacketOpcodes.BANNED_PACKETS.contains(packet.getOpcode())) {
+		if(PacketOpcodesUtils.BANNED_PACKETS.contains(packet.getOpcode())) {
 			return;
 		}
 
@@ -150,7 +150,7 @@ public class GameSession implements GameSessionManager.KcpChannel {
     	// Log
     	switch (GAME_INFO.logPackets) {
     	    case ALL -> {
-    	        if (!loopPacket.contains(packet.getOpcode())) {
+    	        if (!PacketOpcodesUtils.LOOP_PACKETS.contains(packet.getOpcode())) {
                     logPacket("SEND", packet.getOpcode(), packet.getData());
                 }
     	    }
@@ -174,14 +174,6 @@ public class GameSession implements GameSessionManager.KcpChannel {
 		}
     }
 
-	private static final Set<Integer> loopPacket = Set.of(
-			PacketOpcodes.PingReq,
-			PacketOpcodes.PingRsp,
-			PacketOpcodes.WorldPlayerRTTNotify,
-			PacketOpcodes.UnionCmdNotify,
-			PacketOpcodes.QueryPathReq
-	);
-
 	@Override
 	public void onConnected(GameSessionManager.KcpTunnel tunnel) {
 		this.tunnel = tunnel;
@@ -234,7 +226,7 @@ public class GameSession implements GameSessionManager.KcpChannel {
 				// Log packet
 				switch (GAME_INFO.logPackets) {
     	            case ALL -> {
-    	                if (!loopPacket.contains(opcode)) {
+    	                if (!PacketOpcodesUtils.LOOP_PACKETS.contains(opcode)) {
                             logPacket("RECV",opcode, payload);
                         }
     	            }