Ensure changes to eureka metadata are relected on refresh

And also when using eureka-first for discovering config server.
The EurekaClient is very rigid and initializes itself, registering
with the remote service on instantiation. Hance it needs to be
in @RefreshScope for it to be properly refreshable. Doing that
leads to a sequence of other changes (e.g. to account for the
fact that there is no @RefreshScope in bootstrap context).

Fixes gh-551

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/config/DiscoveryClientConfigServiceAutoConfiguration.java

@@ -21,12 +21,11 @@
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
-import org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor;
 import org.springframework.cloud.netflix.eureka.EurekaDiscoveryClientConfiguration;
+import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Configuration;
 
-import com.netflix.appinfo.EurekaInstanceConfig;
-import com.netflix.discovery.EurekaClientConfig;
+import com.netflix.discovery.EurekaClient;
 
 /**
  * Bootstrap configuration for a config client that wants to lookup the config server via
@@ -36,36 +35,23 @@
  */
 @ConditionalOnBean({ EurekaDiscoveryClientConfiguration.class })
 @ConditionalOnProperty(value = "spring.cloud.config.discovery.enabled", matchIfMissing = false)
-@Configuration
+@Configuration(value = "DiscoveryClientConfigServiceAutoConfiguration")
 public class DiscoveryClientConfigServiceAutoConfiguration {
 
 	@Autowired
-	private EurekaClientConfig clientConfig;
-
-	@Autowired
-	private EurekaInstanceConfig instanceConfig;
-
-	@Autowired
-	private ConfigurationPropertiesBindingPostProcessor binder;
-
-	@Autowired
-	private EurekaDiscoveryClientConfiguration clientConfiguration;
+	private ConfigurableApplicationContext context;
 
 	@PostConstruct
 	public void init() {
-		this.clientConfiguration.stop();
-		rebind(this.clientConfig, "eurekaClientConfig");
-		rebind(this.instanceConfig, "eurekaInstanceConfig");
-		// Danger, here be dragons (once it shuts down it's hard to resurrect it)
-		// eurekaClient.shutdown();
-		// FIXME: reinit EurekaClient and ApplicationInfoManager
-		// applicationInfoManager.initComponent(this.instanceConfig);
-		// discoveryManager.initComponent(this.instanceConfig, this.clientConfig);
-		this.clientConfiguration.start();
-	}
-
-	private void rebind(Object bean, String name) {
-		this.binder.postProcessBeforeInitialization(bean, name);
+		if (this.context.getParent() != null) {
+			if (this.context.getBeanNamesForType(EurekaClient.class).length > 0
+					&& this.context.getParent()
+							.getBeanNamesForType(EurekaClient.class).length > 0) {
+				// If the parent has a EurekaClient as well it should be shutdown, so the
+				// local one can register accurate instance info
+				this.context.getParent().getBean(EurekaClient.class).shutdown();
+			}
+		}
 	}
 
 }

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration.java

@@ -16,20 +16,35 @@
 
 package org.springframework.cloud.netflix.eureka;
 
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
 import javax.annotation.PostConstruct;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
+import org.springframework.boot.autoconfigure.condition.AllNestedConditions;
+import org.springframework.boot.autoconfigure.condition.AnyNestedCondition;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.autoconfigure.condition.SearchStrategy;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.cloud.autoconfigure.RefreshAutoConfiguration;
 import org.springframework.cloud.client.CommonsClientAutoConfiguration;
 import org.springframework.cloud.client.discovery.DiscoveryClient;
 import org.springframework.cloud.client.discovery.noop.NoopDiscoveryClientAutoConfiguration;
+import org.springframework.cloud.context.scope.refresh.RefreshScope;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Conditional;
 import org.springframework.context.annotation.Configuration;
 
 import com.netflix.appinfo.ApplicationInfoManager;
@@ -51,11 +66,9 @@
 @ConditionalOnProperty(value = "eureka.client.enabled", matchIfMissing = true)
 @AutoConfigureBefore({ NoopDiscoveryClientAutoConfiguration.class,
 		CommonsClientAutoConfiguration.class })
+@AutoConfigureAfter(RefreshAutoConfiguration.class)
 public class EurekaClientAutoConfiguration {
 
-	@Autowired
-	private ApplicationContext context;
-
 	@Value("${server.port:${SERVER_PORT:${PORT:8080}}}")
 	int nonSecurePort;
 
@@ -69,27 +82,19 @@ public void init() {
 	}
 
 	@Bean
-	@ConditionalOnMissingBean(EurekaClientConfig.class)
+	@ConditionalOnMissingBean(value = EurekaClientConfig.class, search = SearchStrategy.CURRENT)
 	public EurekaClientConfigBean eurekaClientConfigBean() {
 		return new EurekaClientConfigBean();
 	}
 
 	@Bean
-	@ConditionalOnMissingBean(EurekaInstanceConfig.class)
+	@ConditionalOnMissingBean(value = EurekaInstanceConfig.class, search = SearchStrategy.CURRENT)
 	public EurekaInstanceConfigBean eurekaInstanceConfigBean() {
 		EurekaInstanceConfigBean instance = new EurekaInstanceConfigBean();
 		instance.setNonSecurePort(this.nonSecurePort);
 		return instance;
 	}
 
-	@Bean
-	@ConditionalOnMissingBean(EurekaClient.class)
-	@SneakyThrows
-	public EurekaClient eurekaClient(ApplicationInfoManager applicationInfoManager,
-			EurekaClientConfig config) {
-		return new CloudEurekaClient(applicationInfoManager, config, this.context);
-	}
-
 	@Bean
 	@ConditionalOnMissingBean(ApplicationInfoManager.class)
 	public ApplicationInfoManager applicationInfoManager(EurekaInstanceConfig config,
@@ -109,4 +114,84 @@ public DiscoveryClient discoveryClient(EurekaInstanceConfig config,
 		return new EurekaDiscoveryClient(config, client);
 	}
 
+	@Configuration
+	@ConditionalOnMissingRefreshScope
+	protected static class EurekaClientConfiguration {
+
+		@Autowired
+		private ApplicationContext context;
+
+		@Bean(destroyMethod = "shutdown")
+		@ConditionalOnMissingBean(value = EurekaClient.class, search = SearchStrategy.CURRENT)
+		@SneakyThrows
+		public EurekaClient eurekaClient(ApplicationInfoManager applicationInfoManager,
+				EurekaClientConfig config, EurekaInstanceConfig instance) {
+			applicationInfoManager.initComponent(instance);
+			return new CloudEurekaClient(applicationInfoManager, config, this.context);
+		}
+	}
+
+	@Configuration
+	@ConditionalOnRefreshScope
+	protected static class RefreshableEurekaClientConfiguration {
+
+		@Autowired
+		private ApplicationContext context;
+
+		@Bean(destroyMethod = "shutdown")
+		@ConditionalOnMissingBean(value = EurekaClient.class, search = SearchStrategy.CURRENT)
+		@SneakyThrows
+		@org.springframework.cloud.context.config.annotation.RefreshScope
+		public EurekaClient eurekaClient(ApplicationInfoManager applicationInfoManager,
+				EurekaClientConfig config, EurekaInstanceConfig instance) {
+			applicationInfoManager.initComponent(instance);
+			return new CloudEurekaClient(applicationInfoManager, config, this.context);
+		}
+
+	}
+
+	@Target({ElementType.TYPE, ElementType.METHOD})
+	@Retention(RetentionPolicy.RUNTIME)
+	@Documented
+	@Conditional(OnMissingRefreshScopeCondition.class)
+	@interface ConditionalOnMissingRefreshScope {
+
+	}
+
+	@Target({ElementType.TYPE, ElementType.METHOD})
+	@Retention(RetentionPolicy.RUNTIME)
+	@Documented
+	@Conditional(OnRefreshScopeCondition.class)
+	@interface ConditionalOnRefreshScope {
+
+	}
+
+	private static class OnMissingRefreshScopeCondition extends AnyNestedCondition {
+
+		public OnMissingRefreshScopeCondition() {
+			super(ConfigurationPhase.REGISTER_BEAN);
+		}
+
+		@ConditionalOnMissingClass("org.springframework.cloud.context.scope.refresh.RefreshScope")
+		static class MissingClass {
+		}
+
+		@ConditionalOnMissingBean(RefreshScope.class)
+		static class MissingScope {
+		}
+
+	}
+
+	private static class OnRefreshScopeCondition extends AllNestedConditions {
+
+		public OnRefreshScopeCondition() {
+			super(ConfigurationPhase.REGISTER_BEAN);
+		}
+
+		@ConditionalOnClass(RefreshScope.class)
+		@ConditionalOnBean(RefreshScope.class)
+		static class FoundScope {
+		}
+
+	}
 }

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/eureka/EurekaDiscoveryClientConfiguration.java

@@ -35,7 +35,7 @@
 import org.springframework.boot.context.embedded.EmbeddedServletContainerInitializedEvent;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.cloud.client.discovery.event.InstanceRegisteredEvent;
-import org.springframework.cloud.context.environment.EnvironmentChangeEvent;
+import org.springframework.cloud.context.scope.refresh.RefreshScopeRefreshedEvent;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.SmartLifecycle;
 import org.springframework.context.annotation.Bean;
@@ -98,6 +98,7 @@ public void start() {
 		// because of containerPortInitializer below
 		if (!this.running.get() && this.instanceConfig.getNonSecurePort() > 0) {
 
+			this.eurekaClient.getApplications(); // force initialization
 			log.info("Registering application " + this.instanceConfig.getAppname()
 					+ " with eureka with status "
 					+ this.instanceConfig.getInitialStatus());
@@ -159,13 +160,13 @@ public void onApplicationEvent(EmbeddedServletContainerInitializedEvent event) {
 	}
 
 	@Configuration
-	@ConditionalOnClass(EnvironmentChangeEvent.class)
+	@ConditionalOnClass(RefreshScopeRefreshedEvent.class)
 	protected static class EurekaClientConfigurationRefresher {
 		@Autowired
 		private EurekaDiscoveryClientConfiguration clientConfig;
 
-		@EventListener(EnvironmentChangeEvent.class)
-		public void onApplicationEvent(EnvironmentChangeEvent event) {
+		@EventListener(RefreshScopeRefreshedEvent.class)
+		public void onApplicationEvent(RefreshScopeRefreshedEvent event) {
 			// register in case meta data changed
 			this.clientConfig.stop();
 			this.clientConfig.start();

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/eureka/ConditionalOnRefreshScopeTests.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2015 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
+ *
+ *      http://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.netflix.eureka;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.After;
+import org.junit.Test;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.cloud.autoconfigure.RefreshAutoConfiguration;
+import org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration.ConditionalOnRefreshScope;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * @author Dave Syer
+ *
+ */
+public class ConditionalOnRefreshScopeTests {
+
+	private ConfigurableApplicationContext context;
+
+	@After
+	public void close() {
+		if (this.context != null) {
+			this.context.close();
+		}
+	}
+
+	@Test
+	public void refreshScopeIncluded() {
+		this.context = new SpringApplicationBuilder(RefreshAutoConfiguration.class,
+				Beans.class).web(false).showBanner(false).run();
+		assertNotNull(this.context.getBean(
+				org.springframework.cloud.context.scope.refresh.RefreshScope.class));
+		assertEquals("foo", this.context.getBean("foo"));
+	}
+
+	@Test
+	public void refreshScopeNotIncluded() {
+		this.context = new SpringApplicationBuilder(Beans.class).web(false)
+				.showBanner(false).run();
+		assertFalse(this.context.containsBean("foo"));
+	}
+
+	@Configuration
+	protected static class Beans {
+		@Bean
+		@ConditionalOnRefreshScope
+		public String foo() {
+			return "foo";
+		}
+	}
+
+}

spring-cloud-netflix-core/src/test/java/org/springframework/cloud/netflix/eureka/healthcheck/EurekaHealthCheckTests.java

@@ -35,7 +35,7 @@
 import org.springframework.test.context.web.WebAppConfiguration;
 
 import com.netflix.appinfo.InstanceInfo;
-import com.netflix.discovery.DiscoveryClient;
+import com.netflix.discovery.EurekaClient;
 
 
 /**
@@ -46,17 +46,17 @@
 @RunWith(SpringJUnit4ClassRunner.class)
 @SpringApplicationConfiguration(classes = EurekaHealthCheckTests.EurekaHealthCheckApplication.class)
 @WebAppConfiguration
-@IntegrationTest({"server.port=0", "eureka.client.healthcheck.enabled=true"})
+@IntegrationTest({"server.port=0", "eureka.client.healthcheck.enabled=true", "debug=true"})
 @DirtiesContext
 public class EurekaHealthCheckTests {
 
     @Autowired
-    private DiscoveryClient discoveryClient;
+    private EurekaClient discoveryClient;
 
     @Test
     public void shouldRegisterService() {
 
-        InstanceInfo.InstanceStatus status = discoveryClient.getHealthCheckHandler()
+        InstanceInfo.InstanceStatus status = this.discoveryClient.getHealthCheckHandler()
                         .getStatus(InstanceInfo.InstanceStatus.UNKNOWN);
 
         assertNotNull(status);