Java tutorial
/* * * Copyright 2012 Netflix, Inc. * * 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 com.netflix.simianarmy.aws.janitor.crawler; import java.util.Collections; import java.util.EnumSet; import java.util.HashMap; import java.util.LinkedList; import java.util.List; import java.util.Map; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.amazonaws.services.autoscaling.model.AutoScalingInstanceDetails; import com.amazonaws.services.ec2.model.Instance; import com.amazonaws.services.ec2.model.Tag; import com.netflix.simianarmy.Resource; import com.netflix.simianarmy.ResourceType; import com.netflix.simianarmy.aws.AWSResource; import com.netflix.simianarmy.aws.AWSResourceType; import com.netflix.simianarmy.client.aws.AWSClient; /** * The crawler to crawl AWS instances for janitor monkey. */ public class InstanceJanitorCrawler extends AbstractAWSJanitorCrawler { /** The name representing the additional field name of ASG's name. */ public static final String INSTANCE_FIELD_ASG_NAME = "ASG_NAME"; /** The Constant LOGGER. */ private static final Logger LOGGER = LoggerFactory.getLogger(InstanceJanitorCrawler.class); /** * Instantiates a new basic instance crawler. * @param awsClient * the aws client */ public InstanceJanitorCrawler(AWSClient awsClient) { super(awsClient); } @Override public EnumSet<? extends ResourceType> resourceTypes() { return EnumSet.of(AWSResourceType.INSTANCE); } @Override public List<Resource> resources(ResourceType resourceType) { if ("INSTANCE".equals(resourceType.name())) { return getInstanceResources(); } return Collections.emptyList(); } @Override public List<Resource> resources(String... resourceIds) { return getInstanceResources(resourceIds); } private List<Resource> getInstanceResources(String... instanceIds) { List<Resource> resources = new LinkedList<Resource>(); AWSClient awsClient = getAWSClient(); Map<String, AutoScalingInstanceDetails> idToASGInstance = new HashMap<String, AutoScalingInstanceDetails>(); for (AutoScalingInstanceDetails instanceDetails : awsClient.describeAutoScalingInstances(instanceIds)) { idToASGInstance.put(instanceDetails.getInstanceId(), instanceDetails); } for (Instance instance : awsClient.describeInstances(instanceIds)) { Resource instanceResource = new AWSResource().withId(instance.getInstanceId()) .withRegion(getAWSClient().region()).withResourceType(AWSResourceType.INSTANCE) .withLaunchTime(instance.getLaunchTime()); for (Tag tag : instance.getTags()) { instanceResource.setTag(tag.getKey(), tag.getValue()); } String description = String.format("type=%s; host=%s", instance.getInstanceType(), instance.getPublicDnsName() == null ? "" : instance.getPublicDnsName()); instanceResource.setDescription(description); instanceResource.setOwnerEmail(getOwnerEmailForResource(instanceResource)); String asgName = getAsgName(instanceResource, idToASGInstance); if (asgName != null) { instanceResource.setAdditionalField(INSTANCE_FIELD_ASG_NAME, asgName); LOGGER.info(String.format("instance %s has a ASG tag name %s.", instanceResource.getId(), asgName)); } if (instance.getState() != null) { ((AWSResource) instanceResource).setAWSResourceState(instance.getState().getName()); } resources.add(instanceResource); } return resources; } private String getAsgName(Resource instanceResource, Map<String, AutoScalingInstanceDetails> idToASGInstance) { String asgName = instanceResource.getTag("aws:autoscaling:groupName"); if (asgName == null) { // At most times the aws:autoscaling:groupName tag has the ASG name, but there are cases // that the instance is not correctly tagged and we can find the ASG name from AutoScaling // service. AutoScalingInstanceDetails instanceDetails = idToASGInstance.get(instanceResource.getId()); if (instanceDetails != null) { asgName = instanceDetails.getAutoScalingGroupName(); } } return asgName; } }