/*
* Copyright 2013-2016 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.turbine;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import com.netflix.appinfo.AmazonInfo;
import com.netflix.appinfo.DataCenterInfo;
import com.netflix.appinfo.InstanceInfo;
import com.netflix.appinfo.InstanceInfo.InstanceStatus;
import com.netflix.discovery.EurekaClient;
import com.netflix.discovery.shared.Application;
import com.netflix.turbine.discovery.Instance;
import lombok.extern.apachecommons.CommonsLog;
/**
* Class that encapsulates an {@link com.netflix.turbine.discovery.InstanceDiscovery}
* implementation that uses Eureka (see https://github.com/Netflix/eureka) The plugin
* requires a list of applications configured. It then queries the set of instances for
* each application. Instance information retrieved from Eureka must be translated to
* something that Turbine can understand i.e the
* {@link com.netflix.turbine.discovery.Instance} class.
* <p>
* All the logic to perform this translation can be overriden here, so that you can
* provide your own implementation if needed.
*
* @author Spencer Gibb
*/
@CommonsLog
public class EurekaInstanceDiscovery extends CommonsInstanceDiscovery {
private static final String EUREKA_DEFAULT_CLUSTER_NAME_EXPRESSION = "appName";
private static final String ASG_KEY = "asg";
private final EurekaClient eurekaClient;
public EurekaInstanceDiscovery(TurbineProperties turbineProperties, EurekaClient eurekaClient) {
super(turbineProperties, EUREKA_DEFAULT_CLUSTER_NAME_EXPRESSION);
this.eurekaClient = eurekaClient;
}
/**
* Private helper that fetches the Instances for each application.
* @param serviceId
* @return List<Instance>
* @throws Exception
*/
@Override
protected List<Instance> getInstancesForApp(String serviceId) throws Exception {
List<Instance> instances = new ArrayList<>();
log.info("Fetching instances for app: " + serviceId);
Application app = eurekaClient.getApplication(serviceId);
if (app == null) {
log.warn("Eureka returned null for app: " + serviceId);
return instances;
}
try {
List<InstanceInfo> instancesForApp = app.getInstances();
if (instancesForApp != null) {
log.info("Received instance list for app: " + serviceId + ", size="
+ instancesForApp.size());
for (InstanceInfo iInfo : instancesForApp) {
Instance instance = marshall(iInfo);
if (instance != null) {
instances.add(instance);
}
}
}
}
catch (Exception e) {
log.warn("Failed to retrieve instances from Eureka", e);
}
return instances;
}
/**
* Private helper that marshals the information from each instance into something that
* Turbine can understand. Override this method for your own implementation for
* parsing Eureka info.
* @param instanceInfo
* @return Instance
*/
Instance marshall(InstanceInfo instanceInfo) {
String hostname = instanceInfo.getHostName();
final String managementPort = instanceInfo.getMetadata().get("management.port");
String port = managementPort == null ? String.valueOf(instanceInfo.getPort()) : managementPort;
String cluster = getClusterName(instanceInfo);
Boolean status = parseInstanceStatus(instanceInfo.getStatus());
if (hostname != null && cluster != null && status != null) {
Instance instance = getInstance(hostname, port, cluster, status);
Map<String, String> metadata = instanceInfo.getMetadata();
boolean securePortEnabled = instanceInfo.isPortEnabled(InstanceInfo.PortType.SECURE);
String securePort = String.valueOf(instanceInfo.getSecurePort());
addMetadata(instance, hostname, port, securePortEnabled, securePort, metadata);
// add amazon metadata
String asgName = instanceInfo.getASGName();
if (asgName != null) {
instance.getAttributes().put(ASG_KEY, asgName);
}
DataCenterInfo dcInfo = instanceInfo.getDataCenterInfo();
if (dcInfo != null && dcInfo.getName().equals(DataCenterInfo.Name.Amazon)) {
AmazonInfo amznInfo = (AmazonInfo) dcInfo;
instance.getAttributes().putAll(amznInfo.getMetadata());
}
return instance;
}
else {
return null;
}
}
/**
* Helper that returns whether the instance is Up of Down
*/
protected Boolean parseInstanceStatus(InstanceStatus status) {
if (status == null) {
return null;
}
return status == InstanceStatus.UP;
}
}