GH-2948: Adding configuration for ReactorKafkaBinderHealthIndicator

Resolves https://github.com/spring-cloud/spring-cloud-stream/issues/2948

binders/kafka-binder/spring-cloud-stream-binder-kafka-reactive/src/main/java/org/springframework/cloud/stream/binder/reactorkafka/ReactorKafkaBinderConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2023 the original author or authors.
+ * Copyright 2022-2024 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.
@@ -30,6 +30,7 @@ import org.springframework.cloud.stream.binder.kafka.support.ConsumerConfigCusto
 import org.springframework.cloud.stream.binder.kafka.support.ProducerConfigCustomizer;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
 
 /**
  * Binder configuration for ReactorKafka.
@@ -40,6 +41,7 @@ import org.springframework.context.annotation.Configuration;
 @Configuration(proxyBeanMethods = false)
 @ConditionalOnMissingBean(Binder.class)
 @EnableConfigurationProperties({ KafkaProperties.class, KafkaExtendedBindingProperties.class })
+@Import({ ReactorKafkaBinderHealthIndicatorConfiguration.class })
 public class ReactorKafkaBinderConfiguration {
 
 	/**
@@ -77,7 +79,6 @@ public class ReactorKafkaBinderConfiguration {
 			ObjectProvider<ProducerConfigCustomizer> producerConfigCustomizer,
 			ObjectProvider<ReceiverOptionsCustomizer> receiverOptionsCustomizers,
 			ObjectProvider<SenderOptionsCustomizer> senderOptionsptionsCustomizers) {
-
 		ReactorKafkaBinder reactorKafkaBinder = new ReactorKafkaBinder(configurationProperties, provisioningProvider);
 		reactorKafkaBinder.setExtendedBindingProperties(extendedBindingProperties);
 		reactorKafkaBinder.setConsumerConfigCustomizer(consumerConfigCustomizer.getIfUnique());

binders/kafka-binder/spring-cloud-stream-binder-kafka-reactive/src/main/java/org/springframework/cloud/stream/binder/reactorkafka/ReactorKafkaBinderHealthIndicatorConfiguration.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2024-2024 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 org.springframework.cloud.stream.binder.reactorkafka;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.common.serialization.ByteArrayDeserializer;
+
+import org.springframework.boot.actuate.autoconfigure.health.ConditionalOnEnabledHealthIndicator;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.cloud.stream.binder.kafka.properties.KafkaBinderConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.kafka.core.ConsumerFactory;
+import org.springframework.kafka.core.DefaultKafkaConsumerFactory;
+import org.springframework.util.ObjectUtils;
+
+/**
+ * @author Soby Chacko
+ * @since 4.1.2
+ */
+@Configuration(proxyBeanMethods = false)
+@ConditionalOnClass(name = "org.springframework.boot.actuate.health.HealthIndicator")
+@ConditionalOnEnabledHealthIndicator("binders")
+public class ReactorKafkaBinderHealthIndicatorConfiguration {
+
+	@Bean
+	public ReactorKafkaBinderHealthIndicator reactorKafkaBinderHealthIndicator(
+		ReactorKafkaBinder reactorKafkaBinder,
+		KafkaBinderConfigurationProperties configurationProperties) {
+		Map<String, Object> props = new HashMap<>();
+		props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,
+			ByteArrayDeserializer.class);
+		props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,
+			ByteArrayDeserializer.class);
+		Map<String, Object> mergedConfig = configurationProperties
+			.mergedConsumerConfiguration();
+		if (!ObjectUtils.isEmpty(mergedConfig)) {
+			props.putAll(mergedConfig);
+		}
+		if (!props.containsKey(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG)) {
+			props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,
+				configurationProperties.getKafkaConnectionString());
+		}
+		ConsumerFactory<?, ?> consumerFactory = new DefaultKafkaConsumerFactory<>(props);
+		ReactorKafkaBinderHealthIndicator indicator = new ReactorKafkaBinderHealthIndicator(
+			reactorKafkaBinder, consumerFactory);
+		indicator.setTimeout(configurationProperties.getHealthTimeout());
+		indicator.setConsiderDownWhenAnyPartitionHasNoLeader(configurationProperties.isConsiderDownWhenAnyPartitionHasNoLeader());
+		return indicator;
+	}
+
+}

binders/kafka-binder/spring-cloud-stream-binder-kafka-reactive/src/test/java/org/springframework/cloud/stream/binder/reactorkafka/ReactorKafkaBinderIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022-2023 the original author or authors.
+ * Copyright 2022-2024 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.
@@ -37,6 +37,9 @@ import reactor.kafka.sender.SenderResult;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.WebApplicationType;
+import org.springframework.boot.actuate.health.CompositeHealthContributor;
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.Status;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.builder.SpringApplicationBuilder;
 import org.springframework.boot.test.context.SpringBootTest;
@@ -81,7 +84,7 @@ class ReactorKafkaBinderIntegrationTests {
 
 	@ParameterizedTest
 	@ValueSource(booleans = { false, true })
-	void endToEndReactorKafkaBinder(boolean excludeKafkaAutoConfig) {
+	void endToEndReactorKafkaBinder(boolean excludeKafkaAutoConfig) throws InterruptedException {
 
 		recOptsCustOrder.clear();
 		patternedDeliveries.clear();
@@ -137,9 +140,20 @@ class ReactorKafkaBinderIntegrationTests {
 			assertThat(recOptsCustOrder).containsExactly("two", "one", "two", "one", "two", "one");
 			await().untilAsserted(() -> assertThat(patternedDeliveries).contains("bazqux", "FOOBAR"));
 			assertThat(context.getBean(ReactiveKafkaApplication.class).correlation).contains(42, 43);
+
+			checkHealth(context, Status.UP);
 		}
 	}
 
+	private static void checkHealth(ConfigurableApplicationContext context,
+									Status expected) throws InterruptedException {
+		CompositeHealthContributor healthIndicator = context
+			.getBean("bindersHealthContributor", CompositeHealthContributor.class);
+		ReactorKafkaBinderHealthIndicator rkbhi = (ReactorKafkaBinderHealthIndicator) healthIndicator.getContributor("reactorKafka");
+		Health health = rkbhi.health();
+		assertThat(health.getStatus()).isEqualTo(expected);
+	}
+
 	private String excludeKafkaAutoConfigParam(boolean excludeKafkaAutoConfig) {
 		return excludeKafkaAutoConfig ?
 			"--spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration" : "foo=bar";