align InstanceRegisteredEvent for all 3 blocking discovery clients (#1518)

spring-cloud-kubernetes-discovery/src/main/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClientBlockingAutoConfiguration.java

@@ -16,15 +16,14 @@
 
 package org.springframework.cloud.kubernetes.discovery;
 
-import org.springframework.beans.factory.InitializingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.boot.web.client.RestTemplateBuilder;
-import org.springframework.cloud.client.discovery.event.InstanceRegisteredEvent;
 import org.springframework.cloud.client.discovery.health.DiscoveryClientHealthIndicatorProperties;
+import org.springframework.cloud.kubernetes.commons.PodUtils;
 import org.springframework.cloud.kubernetes.commons.discovery.ConditionalOnSpringCloudKubernetesBlockingDiscovery;
 import org.springframework.cloud.kubernetes.commons.discovery.ConditionalOnSpringCloudKubernetesBlockingDiscoveryHealthInitializer;
-import org.springframework.context.ApplicationContext;
+import org.springframework.cloud.kubernetes.commons.discovery.KubernetesDiscoveryClientHealthIndicatorInitializer;
 import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -54,13 +53,16 @@ class KubernetesDiscoveryClientBlockingAutoConfiguration {
 	}
 
 	@Bean
-	@ConditionalOnSpringCloudKubernetesBlockingDiscoveryHealthInitializer
-	InitializingBean indicatorInitializer(ApplicationEventPublisher applicationEventPublisher,
-			ApplicationContext applicationContext) {
-		InitializingBean bean = () -> applicationEventPublisher
-				.publishEvent(new InstanceRegisteredEvent<>(applicationContext.getId(), null));
-		return bean;
+	@ConditionalOnMissingBean
+	PodUtils<?> kubernetesDiscoveryPodUtils() {
+		return new KubernetesDiscoveryPodUtils();
+	}
 
+	@Bean
+	@ConditionalOnSpringCloudKubernetesBlockingDiscoveryHealthInitializer
+	KubernetesDiscoveryClientHealthIndicatorInitializer indicatorInitializer(PodUtils<?> podUtils,
+			ApplicationEventPublisher applicationEventPublisher) {
+		return new KubernetesDiscoveryClientHealthIndicatorInitializer(podUtils, applicationEventPublisher);
 	}
 
 }

spring-cloud-kubernetes-discovery/src/main/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryPodUtils.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2013-2023 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 org.springframework.cloud.kubernetes.discovery;
+
+import java.util.function.Supplier;
+
+import org.springframework.cloud.kubernetes.commons.PodUtils;
+
+/**
+ * @author wind57
+ */
+final class KubernetesDiscoveryPodUtils implements PodUtils<Object> {
+
+	@Override
+	public Supplier<Object> currentPod() {
+		// we don't really have a way to get the pod here
+		return () -> null;
+	}
+
+	@Override
+	public boolean isInsideKubernetes() {
+		// this bean is used in a config that is annotated
+		// with @ConditionalOnCloudPlatform(CloudPlatform.KUBERNETES),
+		// so safe to return true here.
+		return true;
+	}
+
+}

spring-cloud-kubernetes-discovery/src/test/java/org/springframework/cloud/kubernetes/discovery/BlockingDiscoveryHealthPublishedEventTest.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2013-2023 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 org.springframework.cloud.kubernetes.discovery;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.cloud.client.discovery.event.InstanceRegisteredEvent;
+import org.springframework.context.ApplicationListener;
+import org.springframework.context.annotation.Bean;
+
+import static org.springframework.cloud.kubernetes.commons.discovery.KubernetesDiscoveryClientHealthIndicatorInitializer.RegisteredEventSource;
+
+/**
+ * test that asserts the type of published event for blocking discovery.
+ *
+ * @author wind57
+ */
+@SpringBootTest(
+		properties = { "spring.main.cloud-platform=kubernetes", "spring.cloud.config.enabled=false",
+				"spring.cloud.kubernetes.discovery.discovery-server-url=http://example" },
+		classes = BlockingDiscoveryHealthPublishedEventTest.HealthEventListenerConfiguration.class)
+class BlockingDiscoveryHealthPublishedEventTest {
+
+	private static boolean caught;
+
+	@Test
+	void test() {
+		Assertions.assertTrue(caught);
+	}
+
+	@TestConfiguration
+	static class HealthEventListenerConfiguration {
+
+		@Bean
+		HealthEventListener healthEventListener() {
+			return new HealthEventListener();
+		}
+
+	}
+
+	private static class HealthEventListener implements ApplicationListener<InstanceRegisteredEvent<?>> {
+
+		@Override
+		public void onApplicationEvent(InstanceRegisteredEvent<?> event) {
+			caught = true;
+			Assertions.assertTrue(event.getSource() instanceof RegisteredEventSource);
+			RegisteredEventSource registeredEventSource = (RegisteredEventSource) event.getSource();
+			Assertions.assertTrue(registeredEventSource.inside());
+			Assertions.assertNull(registeredEventSource.pod());
+			Assertions.assertEquals(registeredEventSource.cloudPlatform(), "kubernetes");
+		}
+
+	}
+
+}