Add smoke test for Spring Kafka

- Use a CRaC compatible spring-kafka version ( >=3.0.10-SNAPSHOT)

Closes gh-9

integration/spring-kafka/build.gradle

@@ -0,0 +1,24 @@
+plugins {
+	id "java"
+	id "org.springframework.boot"
+	id "org.springframework.cr.smoke-test"
+}
+
+dependencies {
+	implementation(platform(org.springframework.boot.gradle.plugin.SpringBootPlugin.BOM_COORDINATES))
+	implementation("org.springframework.boot:spring-boot-starter")
+
+	// TODO: update to non snapshot spring-kafka version when available.
+	// The spring-kafka 3.0.10+ is required due to https://github.com/spring-projects/spring-kafka/issues/2760
+	implementation("org.springframework.kafka:spring-kafka:3.0.10-SNAPSHOT")
+
+	implementation("com.fasterxml.jackson.core:jackson-databind")
+
+	implementation("org.crac:crac:$cracVersion")
+	implementation(project(":cr-listener"))
+
+	testImplementation("org.springframework.boot:spring-boot-starter-test")
+
+	appTestImplementation(project(":cr-smoke-test-support"))
+	appTestImplementation("org.awaitility:awaitility:4.2.0")
+}

integration/spring-kafka/docker-compose.yml

@@ -0,0 +1,25 @@
+version: '3'
+services:
+  kafka:
+    image: wurstmeister/kafka
+    hostname: kafka
+    ports:
+      - '9092'
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    environment:
+      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
+      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
+      KAFKA_LISTENERS: PLAINTEXT://:29092,PLAINTEXT_HOST://:9092
+      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:29092,PLAINTEXT_HOST://localhost:_{PORT_COMMAND}
+      KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
+      PORT_COMMAND: "docker ps | egrep 'kafka(-|_)1' | cut -d: -f 2 | cut -d- -f 1"
+    depends_on:
+      - zookeeper
+
+  zookeeper:
+    image: wurstmeister/zookeeper
+    ports:
+      - '2181'
+    environment:
+      - KAFKA_ADVERTISED_HOST_NAME=zookeeper

integration/spring-kafka/src/appTest/java/com/example/kafka/KafkaApplicationTests.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2022-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.kafka;
+
+import java.time.Duration;
+
+import org.awaitility.Awaitility;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.cr.smoketest.support.assertj.AssertableOutput;
+import org.springframework.cr.smoketest.support.junit.ApplicationTest;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@ApplicationTest
+class KafkaApplicationTests {
+
+	@Test
+	void kafkaListenerMethodReceivesMessageAndSendsResponse(AssertableOutput output) {
+		Awaitility.await()
+			.atMost(Duration.ofSeconds(30))
+			.untilAsserted(() -> assertThat(output).hasSingleLineContaining(
+					"++++++Received: Greeting{message='Hello from Coordinated Restore at Checkpoint!'}"));
+	}
+
+}

integration/spring-kafka/src/main/java/com/example/kafka/KafkaApplication.java

@@ -0,0 +1,66 @@
+package com.example.kafka;
+
+import org.apache.kafka.clients.admin.NewTopic;
+
+import org.springframework.boot.ApplicationRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.kafka.config.TopicBuilder;
+import org.springframework.kafka.core.ConsumerFactory;
+import org.springframework.kafka.core.KafkaTemplate;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+@SpringBootApplication
+public class KafkaApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(KafkaApplication.class, args);
+	}
+
+	@KafkaListener(id = "crac", topics = "crac")
+	public void listen(Greeting in) {
+		System.out.println("++++++Received: " + in);
+	}
+
+	@Bean
+	public NewTopic topic() {
+		return TopicBuilder.name("crac").partitions(1).replicas(1).build();
+	}
+
+	@Bean
+	public ApplicationRunner runner(KafkaTemplate<Object, Object> template, ConsumerFactory<Object, Object> cf) {
+
+		cf.addListener(new ConsumerFactory.Listener<>() {
+		});
+		return args -> {
+			Greeting data = new Greeting("Hello from Coordinated Restore at Checkpoint!");
+			template.send("crac", data);
+			System.out.println("++++++Sent: " + data);
+		};
+	}
+
+	public static class Greeting {
+
+		private final String message;
+
+		@JsonCreator
+		public Greeting(@JsonProperty("message") String message) {
+			this.message = message;
+		}
+
+		public String getMessage() {
+			return this.message;
+		}
+
+		@Override
+		public String toString() {
+			return "Greeting{" + "message='" + this.message + '\'' + '}';
+		}
+
+	}
+
+}

integration/spring-kafka/src/main/resources/application.properties

@@ -0,0 +1,5 @@
+spring.kafka.bootstrap-servers=localhost:${KAFKA_PORT_9092:9092}
+spring.kafka.consumer.auto-offset-reset=earliest
+spring.kafka.consumer.value-deserializer=org.springframework.kafka.support.serializer.JsonDeserializer
+spring.kafka.consumer.properties[spring.json.trusted.packages]=com.example.kafka
+spring.kafka.producer.value-serializer=org.springframework.kafka.support.serializer.JsonSerializer