Added stubs for kafka connection but configuration (wsl + windows) needs to be checked.

2024/08/chat_demo1/chat_demo1_web/src/main/java/ch/polgrabia/demos/server/WebsocketServerApp.java

@@ -1,19 +1,29 @@
 package ch.polgrabia.demos.server;
 
 import io.vertx.core.Vertx;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 
 public class WebsocketServerApp {
-    private static final Logger logger = LoggerFactory.getLogger(WebsocketServerApp.class);
-
     public static void main(String[] args) {
+        /**
+        Properties props = new Properties();
+        props.put("bootstrap.servers", "localhost:9092");
+        props.put("linger.ms", 1);
+        props.put("key.serializer", "org.apache.kafka.common.serialization.StringSerializer");
+        props.put("value.serializer", "org.apache.kafka.common.serialization.ByteArraySerializer");
+
+        Producer<String, byte[]> kafkaProducer = new KafkaProducer<>(props);
+        **/
+
         var vertx = Vertx.vertx();
-        WebsocketServerChatVerticle websocketServerChatVerticle = new WebsocketServerChatVerticle(8080, "localhost");
+        WebsocketServerChatVerticle websocketServerChatVerticle = new WebsocketServerChatVerticle(
+                8080,
+                "localhost",
+                null); // kafka producer
         vertx.deployVerticle(websocketServerChatVerticle);
         websocketServerChatVerticle
                 .waitUntilFinished()
                 .join();
         vertx.close();
+        // kafkaProducer.close();
     }
 }

2024/08/chat_demo1/chat_demo1_web/src/main/java/ch/polgrabia/demos/server/WebsocketServerChatVerticle.java

@@ -2,6 +2,7 @@ package ch.polgrabia.demos.server;
 
 import io.vertx.core.AbstractVerticle;
 import io.vertx.core.http.HttpServer;
+import org.apache.kafka.clients.producer.Producer;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -9,6 +10,7 @@ import java.util.concurrent.CompletableFuture;
 
 public class WebsocketServerChatVerticle extends AbstractVerticle {
     private static final Logger logger = LoggerFactory.getLogger(WebsocketServerChatVerticle.class);
+    private final Producer<String, byte[]> kafkaProducer;
     private HttpServer httpServer;
     private final int port;
     private final String hostname;
@@ -16,16 +18,17 @@ public class WebsocketServerChatVerticle extends AbstractVerticle {
     private final Object runningMonitor = new Object();
     private boolean shutdownActivation = false;
 
-    public WebsocketServerChatVerticle(int port, String hostname) {
+    public WebsocketServerChatVerticle(int port, String hostname, Producer<String, byte[]> kafkaProducer) {
         this.port = port;
         this.hostname = hostname;
+        this.kafkaProducer = kafkaProducer;
     }
 
     @Override
     public void start() throws Exception {
         httpServer = getVertx()
                 .createHttpServer();
-        httpServer.webSocketHandler(new WebsocketServerHandler()).listen(port, hostname);
+        httpServer.webSocketHandler(new WebsocketServerHandler(kafkaProducer)).listen(port, hostname);
         shutdownActivation = true;
     }
 

2024/08/chat_demo1/chat_demo1_web/src/main/java/ch/polgrabia/demos/server/WebsocketServerHandler.java

@@ -3,6 +3,8 @@ package ch.polgrabia.demos.server;
 import io.vertx.core.Handler;
 import io.vertx.core.buffer.Buffer;
 import io.vertx.core.http.ServerWebSocket;
+import org.apache.kafka.clients.producer.Producer;
+import org.apache.kafka.clients.producer.ProducerRecord;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -15,11 +17,16 @@ public class WebsocketServerHandler implements Handler<ServerWebSocket> {
 
     private static final ConcurrentHashMap<String, Set<ServerWebSocket>>
             channelSocketMapping = new ConcurrentHashMap<>();
+    private final Producer<String, byte[]> kafkaProducer;
+
+    public WebsocketServerHandler(Producer<String, byte[]> kafkaProducer) {
+        this.kafkaProducer = kafkaProducer;
+    }
 
     @Override
     public void handle(ServerWebSocket serverWebSocket) {
         serverWebSocket.writeBinaryMessage(Buffer.buffer("Hello"));
-        serverWebSocket.handler(new WebsocketMessageHandler(serverWebSocket));
+        serverWebSocket.handler(new WebsocketMessageHandler(kafkaProducer, serverWebSocket));
         String channel = serverWebSocket.path();
         Set<ServerWebSocket> sockets = channelSocketMapping.computeIfAbsent(channel, (k) -> {
             Set<ServerWebSocket> s = new HashSet<>();
@@ -50,8 +57,10 @@ public class WebsocketServerHandler implements Handler<ServerWebSocket> {
     static class WebsocketMessageHandler implements Handler<Buffer> {
 
         private final ServerWebSocket serverWebSocket;
+        private final Producer<String, byte[]> kafkaProducer;
 
-        public WebsocketMessageHandler(ServerWebSocket serverWebSocket) {
+        public WebsocketMessageHandler(Producer<String, byte[]> kafkaProducer, ServerWebSocket serverWebSocket) {
+            this.kafkaProducer = kafkaProducer;
             this.serverWebSocket = serverWebSocket;
             this.serverWebSocket.setWriteQueueMaxSize(0);
         }
@@ -62,6 +71,7 @@ public class WebsocketServerHandler implements Handler<ServerWebSocket> {
             String channel = serverWebSocket.path();
             logger.info("[{}] Got message {}", channel, s);
             serverWebSocket.writeBinaryMessage(Buffer.buffer("Pong: " + s.toString() + "\n")); // TBD send to kafka
+            // kafkaProducer.send(new ProducerRecord<>(channel, channel, s.getBytes())); // kafka setup needs to be checked
         }
     }
 

2024/08/chat_demo1/tools/docker-compose.yaml

@@ -5,13 +5,16 @@ services:
     environment:
       KAFKA_NODE_ID: 1
       KAFKA_PROCESS_ROLES: broker,controller
-      KAFKA_LISTENERS: PLAINTEXT://localhost:9092,CONTROLLER://localhost:9093
+      KAFKA_LISTENERS: PLAINTEXT://0.0.0.0:9092,CONTROLLER://0.0.0.0:9093
-      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://localhost:9092
+      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://0.0.0.0:9092
       KAFKA_CONTROLLER_LISTENER_NAMES: CONTROLLER
       KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: CONTROLLER:PLAINTEXT,PLAINTEXT:PLAINTEXT
-      KAFKA_CONTROLLER_QUORUM_VOTERS: 1@localhost:9093
+      KAFKA_CONTROLLER_QUORUM_VOTERS: 1@0.0.0.0:9093
       KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
       KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR: 1
       KAFKA_TRANSACTION_STATE_LOG_MIN_ISR: 1
       KAFKA_GROUP_INITIAL_REBALANCE_DELAY_MS: 0
       KAFKA_NUM_PARTITIONS: 3
+    ports:
+      - "9092:9092"
+      - "9093:9093"