Use default instanceid for sidecar

fixes gh-847

spring-cloud-netflix-eureka-client/pom.xml

@@ -13,6 +13,8 @@
 	<name>Spring Cloud Netflix Eureka Client</name>
 	<description>Spring Cloud Netflix Eureka Client</description>
 	<properties>
+		<!-- Why do I need this now? -->
+		<maven.javadoc.failOnError>false</maven.javadoc.failOnError>
 		<main.basedir>${basedir}/..</main.basedir>
 	</properties>
 	<dependencies>

spring-cloud-netflix-sidecar/src/main/java/org/springframework/cloud/netflix/sidecar/SidecarConfiguration.java

@@ -26,10 +26,14 @@ import org.springframework.cloud.netflix.eureka.EurekaInstanceConfigBean;
 import org.springframework.cloud.util.InetUtils;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.util.StringUtils;
 
 import com.netflix.appinfo.HealthCheckHandler;
 import com.netflix.discovery.EurekaClientConfig;
 
+import static org.springframework.cloud.util.IdUtils.getDefaultInstanceId;
+
 /**
  * @author Spencer Gibb
  */
@@ -57,17 +61,24 @@ public class SidecarConfiguration {
 		@Autowired
 		private InetUtils inetUtils;
 
-		@Value("${server.port:${SERVER_PORT:${PORT:8080}}}")
-		private int serverPort = 8080;
-
 		@Value("${management.port:${MANAGEMENT_PORT:${PORT:8080}}}")
 		private int managementPort = 8080;
 
+		@Value("${eureka.instance.hostname:${EUREKA_INSTANCE_HOSTNAME:}}")
+		String hostname;
+
+		@Autowired
+		ConfigurableEnvironment env;
+
 		@Bean
 		public EurekaInstanceConfigBean eurekaInstanceConfigBean() {
 			EurekaInstanceConfigBean config = new EurekaInstanceConfigBean(inetUtils);
 			int port = this.sidecarProperties.getPort();
 			config.setNonSecurePort(port);
+			config.setInstanceId(getDefaultInstanceId(this.env));
+			if (StringUtils.hasText(this.hostname)) {
+				config.setHostname(this.hostname);
+			}
 			String scheme = config.getSecurePortEnabled() ? "https" : "http";
 			config.setStatusPageUrl(scheme + "://" + config.getHostname() + ":"
 					+ this.managementPort + config.getStatusPageUrlPath());

spring-cloud-netflix-sidecar/src/test/java/org/springframework/cloud/netflix/sidecar/SidecarApplicationTests.java

@@ -18,19 +18,30 @@ package org.springframework.cloud.netflix.sidecar;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
-import org.springframework.boot.test.IntegrationTest;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.SpringApplicationConfiguration;
+import org.springframework.boot.test.WebIntegrationTest;
+import org.springframework.cloud.netflix.eureka.EurekaInstanceConfigBean;
 import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
-import org.springframework.test.context.web.WebAppConfiguration;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
 
 @RunWith(SpringJUnit4ClassRunner.class)
 @SpringApplicationConfiguration(classes = SidecarApplication.class)
-@IntegrationTest("server.port=0")
-@WebAppConfiguration
+@WebIntegrationTest(randomPort = true, value = {"spring.application.name=mytest", "spring.cloud.client.hostname=mhhost", "spring.application.instance_id=1", "eureka.instance.hostname=mhhost", "sidecar.port=7000"})
 public class SidecarApplicationTests {
 
+	@Autowired
+	EurekaInstanceConfigBean config;
+
 	@Test
-	public void contextLoads() {
+	public void testEurekaConfigBean() {
+		assertThat(this.config.getAppname(), equalTo("mytest"));
+		assertThat(this.config.getHostname(), equalTo("mhhost"));
+		assertThat(this.config.getInstanceId(), equalTo("mhhost:mytest:1"));
+		assertThat(this.config.getNonSecurePort(), equalTo(7000));
+		System.out.println();
 	}
 
 }

spring-cloud-netflix-sidecar/src/test/resources/application.yml

@@ -11,6 +11,7 @@ sidecar:
 eureka:
   instance:
     app-group-name: mysidecargroup
+    hostname: mysidecarhost
   client:
     serviceUrl:
       defaultZone: http://user:password@localhost:8761/eureka/