Support Kraft post Confluent Platform 7.4.0 (#7014)

Fixes #7010


Co-authored-by: Eddú Meléndez <eddu.melendez@gmail.com>

docs/modules/kafka.md

@@ -34,8 +34,7 @@ If for some reason you want to use an externally running Zookeeper, then just pa
 
 ### Using Kraft mode
 
-The self-managed (Kraft) mode is available as a preview feature since version 3.0 (confluentinc/cp-kafka:7.0.x) and 
-declared as a production ready in 3.3.1 (confluentinc/cp-kafka:7.3.x).
+KRaft mode was declared production ready in 3.3.1 (confluentinc/cp-kafka:7.3.x)" 
 
 <!--codeinclude-->
 [Kraft mode](../../modules/kafka/src/test/java/org/testcontainers/containers/KafkaContainerTest.java) inside_block:withKraftMode

examples/kafka-cluster/src/test/java/com/example/kafkacluster/KafkaContainerClusterTest.java

@@ -51,6 +51,18 @@ public void testKafkaContainerKraftCluster() throws Exception {
         }
     }
 
+    @Test
+    public void testKafkaContainerKraftClusterAfterConfluentPlatform740() throws Exception {
+        try (KafkaContainerKraftCluster cluster = new KafkaContainerKraftCluster("7.4.0", 3, 2)) {
+            cluster.start();
+            String bootstrapServers = cluster.getBootstrapServers();
+
+            assertThat(cluster.getBrokers()).hasSize(3);
+
+            testKafkaFunctionality(bootstrapServers, 3, 2);
+        }
+    }
+
     protected void testKafkaFunctionality(String bootstrapServers, int partitions, int rf) throws Exception {
         try (
             AdminClient adminClient = AdminClient.create(

modules/kafka/src/main/java/org/testcontainers/containers/KafkaContainer.java

@@ -6,11 +6,10 @@
 import org.testcontainers.utility.ComparableVersion;
 import org.testcontainers.utility.DockerImageName;
 
-import java.io.IOException;
+import java.util.Objects;
 
 /**
  * This container wraps Confluent Kafka and Zookeeper (optionally)
- *
  */
 public class KafkaContainer extends GenericContainer<KafkaContainer> {
 
@@ -29,11 +28,13 @@ public class KafkaContainer extends GenericContainer<KafkaContainer> {
     // https://docs.confluent.io/platform/7.0.0/release-notes/index.html#ak-raft-kraft
     private static final String MIN_KRAFT_TAG = "7.0.0";
 
+    public static final String DEFAULT_CLUSTER_ID = "4L6g3nShT-eMCtK--X86sw";
+
     protected String externalZookeeperConnect = null;
 
     private boolean kraftEnabled = false;
 
-    private String clusterId;
+    private String clusterId = DEFAULT_CLUSTER_ID;
 
     /**
      * @deprecated use {@link KafkaContainer(DockerImageName)} instead
@@ -98,7 +99,7 @@ public KafkaContainer withKraft() {
             throw new IllegalStateException("Cannot configure Kraft mode when Zookeeper configured");
         }
         verifyMinKraftVersion();
-        kraftEnabled = true;
+        this.kraftEnabled = true;
         return self();
     }
 
@@ -115,7 +116,13 @@ private void verifyMinKraftVersion() {
         }
     }
 
+    private boolean isLessThanCP740() {
+        String actualVersion = DockerImageName.parse(getDockerImageName()).getVersionPart();
+        return new ComparableVersion(actualVersion).isLessThan("7.4.0");
+    }
+
     public KafkaContainer withClusterId(String clusterId) {
+        Objects.requireNonNull(clusterId, "clusterId cannot be null");
         this.clusterId = clusterId;
         return self();
     }
@@ -126,7 +133,7 @@ public String getBootstrapServers() {
 
     @Override
     protected void configure() {
-        if (kraftEnabled) {
+        if (this.kraftEnabled) {
             waitingFor(Wait.forLogMessage(".*Transitioning from RECOVERY to RUNNING.*", 1));
             configureKraft();
         } else {
@@ -136,31 +143,27 @@ protected void configure() {
     }
 
     protected void configureKraft() {
-        withEnv(
-            "KAFKA_NODE_ID",
-            getEnvMap().computeIfAbsent("KAFKA_NODE_ID", key -> getEnvMap().get("KAFKA_BROKER_ID"))
-        );
+        //CP 7.4.0
+        getEnvMap().computeIfAbsent("CLUSTER_ID", key -> clusterId);
+        getEnvMap().computeIfAbsent("KAFKA_NODE_ID", key -> getEnvMap().get("KAFKA_BROKER_ID"));
         withEnv(
             "KAFKA_LISTENER_SECURITY_PROTOCOL_MAP",
             String.format("%s,CONTROLLER:PLAINTEXT", getEnvMap().get("KAFKA_LISTENER_SECURITY_PROTOCOL_MAP"))
         );
         withEnv("KAFKA_LISTENERS", String.format("%s,CONTROLLER://0.0.0.0:9094", getEnvMap().get("KAFKA_LISTENERS")));
 
         withEnv("KAFKA_PROCESS_ROLES", "broker,controller");
-        withEnv(
-            "KAFKA_CONTROLLER_QUORUM_VOTERS",
-            getEnvMap()
-                .computeIfAbsent(
-                    "KAFKA_CONTROLLER_QUORUM_VOTERS",
-                    key -> {
-                        return String.format(
-                            "%s@%s:9094",
-                            getEnvMap().get("KAFKA_NODE_ID"),
-                            getNetwork() != null ? getNetworkAliases().get(0) : "localhost"
-                        );
-                    }
-                )
-        );
+        getEnvMap()
+            .computeIfAbsent(
+                "KAFKA_CONTROLLER_QUORUM_VOTERS",
+                key -> {
+                    return String.format(
+                        "%s@%s:9094",
+                        getEnvMap().get("KAFKA_NODE_ID"),
+                        getNetwork() != null ? getNetworkAliases().get(0) : "localhost"
+                    );
+                }
+            );
         withEnv("KAFKA_CONTROLLER_LISTENER_NAMES", "CONTROLLER");
     }
 
@@ -186,27 +189,28 @@ protected void containerIsStarting(InspectContainerResponse containerInfo) {
                 brokerAdvertisedListener(containerInfo)
             );
 
-        command += (kraftEnabled) ? commandKraft() : commandZookeeper();
+        if (this.kraftEnabled && isLessThanCP740()) {
+            // Optimization: skip the checks
+            command += "echo '' > /etc/confluent/docker/ensure \n";
+            command += commandKraft();
+        }
+
+        if (!this.kraftEnabled) {
+            // Optimization: skip the checks
+            command += "echo '' > /etc/confluent/docker/ensure \n";
+            command += commandZookeeper();
+        }
 
-        // Optimization: skip the checks
-        command += "echo '' > /etc/confluent/docker/ensure \n";
         // Run the original command
         command += "/etc/confluent/docker/run \n";
         copyFileToContainer(Transferable.of(command, 0777), STARTER_SCRIPT);
     }
 
     protected String commandKraft() {
         String command = "sed -i '/KAFKA_ZOOKEEPER_CONNECT/d' /etc/confluent/docker/configure\n";
-        try {
-            if (clusterId == null) {
-                clusterId = execInContainer("kafka-storage", "random-uuid").getStdout().trim();
-            }
-        } catch (IOException | InterruptedException e) {
-            logger().error("Failed to execute `kafka-storage random-uuid`. Exception message: {}", e.getMessage());
-        }
         command +=
             "echo 'kafka-storage format --ignore-formatted -t \"" +
-            clusterId +
+            this.clusterId +
             "\" -c /etc/kafka/kafka.properties' >> /etc/confluent/docker/configure\n";
         return command;
     }

modules/kafka/src/test/java/org/testcontainers/containers/KafkaContainerTest.java

@@ -133,10 +133,20 @@ public void testWithHostExposedPortAndExternalNetwork() throws Exception {
     }
 
     @Test
-    public void testUsageKraft() throws Exception {
+    public void testUsageKraftBeforeConfluentPlatformVersion74() throws Exception {
         try (
-            // withKraftMode {
             KafkaContainer kafka = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:7.0.1")).withKraft()
+        ) {
+            kafka.start();
+            testKafkaFunctionality(kafka.getBootstrapServers());
+        }
+    }
+
+    @Test
+    public void testUsageKraftAfterConfluentPlatformVersion74() throws Exception {
+        try (
+            // withKraftMode {
+            KafkaContainer kafka = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:7.4.0")).withKraft()
             // }
         ) {
             kafka.start();