Update player login message from server to be sent in chunks for 32000…

Update player login message from server to be sent in chunks for 32000 characters, to avoid the max String length errors. The client will reassemble all chunks and then load the JSON.

src/client/java/com/owlmaddie/ui/ClickHandler.java

@@ -32,6 +32,7 @@ import java.util.stream.Collectors;
  */
 public class ClickHandler {
     private static boolean wasClicked = false;
+    static HashMap<Integer, String> receivedChunks = new HashMap<>();
 
     public static void register() {
         ClientTickEvents.END_CLIENT_TICK.register(client -> {
@@ -76,16 +77,31 @@ public class ClickHandler {
 
         // Client-side player login: get all chat data
         ClientPlayNetworking.registerGlobalReceiver(ModInit.PACKET_S2C_LOGIN, (client, handler, buffer, responseSender) -> {
-            // Read the data from the server packet
-            int length = buffer.readInt();
-            String chatDataJSON = buffer.readString(length);
+            int sequenceNumber = buffer.readInt(); // Sequence number of the current packet
+            int totalPackets = buffer.readInt(); // Total number of packets for this data
+            String chunk = buffer.readString(); // Read the chunk from the current packet
 
-            // Update the chat data manager on the client-side
-            Gson GSON = new Gson();
             client.execute(() -> { // Make sure to run on the client thread
-                // Parse JSON and override client chat data
+                // Store the received chunk
+                receivedChunks.put(sequenceNumber, chunk);
+
+                // Check if all chunks have been received
+                if (receivedChunks.size() == totalPackets) {
+                    // Reconstruct the original chatDataJSON from chunks
+                    StringBuilder chatDataJSONBuilder = new StringBuilder();
+                    for (int i = 0; i < totalPackets; i++) {
+                        chatDataJSONBuilder.append(receivedChunks.get(i));
+                    }
+                    String chatDataJSON = chatDataJSONBuilder.toString();
+
+                    // Parse JSON and update client chat data
+                    Gson GSON = new Gson();
                     Type type = new TypeToken<HashMap<String, ChatDataManager.EntityChatData>>(){}.getType();
                     ChatDataManager.getClientInstance().entityChatDataMap = GSON.fromJson(chatDataJSON, type);
+
+                    // Clear receivedChunks for future use
+                    receivedChunks.clear();
+                }
             });
         });
     }

src/main/java/com/owlmaddie/ModInit.java

@@ -142,19 +142,30 @@ public class ModInit implements ModInitializer {
 			});
 		});
 
+		// Send lite chat data JSON to new player (to populate client data)
+		// Data is sent in chunks, to prevent exceeding the 32767 limit per String.
 		ServerPlayConnectionEvents.JOIN.register((handler, sender, server) -> {
 			ServerPlayerEntity player = handler.player;
 			LOGGER.info("Server send login message packet to player: " + player.getName().getString());
 
-			// Get chat data for logged in player (light version)
 			String chatDataJSON = ChatDataManager.getServerInstance().GetLightChatData();
+			int chunkSize = 32000; // Slightly below the limit to account for any additional data
+
+			// Calculate the number of required packets to send the entire JSON string
+			int totalPackets = (int) Math.ceil(chatDataJSON.length() / (double) chunkSize);
+
+			for (int i = 0; i < totalPackets; i++) {
+				int start = i * chunkSize;
+				int end = Math.min(start + chunkSize, chatDataJSON.length());
+				String chunk = chatDataJSON.substring(start, end);
 
-			// Write the light chat data
 				PacketByteBuf buffer = new PacketByteBuf(Unpooled.buffer());
-			buffer.writeInt(chatDataJSON.length());
-			buffer.writeString(chatDataJSON);
+				buffer.writeInt(i); // Packet sequence number
+				buffer.writeInt(totalPackets); // Total number of packets
+				buffer.writeString(chunk);
 
 				ServerPlayNetworking.send(player, PACKET_S2C_LOGIN, buffer);
+			}
 		});
 
 		ServerWorldEvents.LOAD.register((server, world) -> {