| package org.apache.helix.webapp.resources; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| import java.io.IOException; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.TreeMap; |
| |
| import com.google.common.collect.Lists; |
| import org.apache.helix.HelixDataAccessor; |
| import org.apache.helix.HelixException; |
| import org.apache.helix.zookeeper.datamodel.ZNRecord; |
| import org.apache.helix.zookeeper.impl.client.ZkClient; |
| import org.apache.helix.model.InstanceConfig; |
| import org.apache.helix.model.LiveInstance; |
| import org.apache.helix.tools.ClusterSetup; |
| import org.apache.helix.webapp.RestAdminApplication; |
| import org.codehaus.jackson.JsonGenerationException; |
| import org.codehaus.jackson.map.JsonMappingException; |
| import org.restlet.data.MediaType; |
| import org.restlet.data.Status; |
| import org.restlet.representation.Representation; |
| import org.restlet.representation.StringRepresentation; |
| import org.restlet.representation.Variant; |
| import org.restlet.resource.ServerResource; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class InstancesResource extends ServerResource { |
| private final static Logger LOG = LoggerFactory.getLogger(InstancesResource.class); |
| |
| public InstancesResource() { |
| getVariants().add(new Variant(MediaType.TEXT_PLAIN)); |
| getVariants().add(new Variant(MediaType.APPLICATION_JSON)); |
| setNegotiated(false); |
| } |
| |
| @Override |
| public Representation get() { |
| StringRepresentation presentation = null; |
| try { |
| String clusterName = (String) getRequest().getAttributes().get("clusterName"); |
| presentation = getInstancesRepresentation(clusterName); |
| } |
| |
| catch (Exception e) { |
| String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e); |
| presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON); |
| |
| LOG.error("", e); |
| } |
| return presentation; |
| } |
| |
| StringRepresentation getInstancesRepresentation(String clusterName) |
| throws JsonGenerationException, JsonMappingException, IOException { |
| ZkClient zkClient = (ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT); |
| |
| HelixDataAccessor accessor = |
| ClusterRepresentationUtil.getClusterDataAccessor(zkClient, clusterName); |
| Map<String, LiveInstance> liveInstancesMap = |
| accessor.getChildValuesMap(accessor.keyBuilder().liveInstances()); |
| Map<String, InstanceConfig> instanceConfigsMap = |
| accessor.getChildValuesMap(accessor.keyBuilder().instanceConfigs()); |
| |
| Map<String, List<String>> tagInstanceLists = new TreeMap<String, List<String>>(); |
| |
| for (String instanceName : instanceConfigsMap.keySet()) { |
| boolean isAlive = liveInstancesMap.containsKey(instanceName); |
| instanceConfigsMap.get(instanceName).getRecord().setSimpleField("Alive", isAlive + ""); |
| InstanceConfig config = instanceConfigsMap.get(instanceName); |
| for (String tag : config.getTags()) { |
| if (!tagInstanceLists.containsKey(tag)) { |
| tagInstanceLists.put(tag, new LinkedList<String>()); |
| } |
| if (!tagInstanceLists.get(tag).contains(instanceName)) { |
| tagInstanceLists.get(tag).add(instanceName); |
| } |
| } |
| } |
| |
| // Wrap raw data into an object, then serialize it |
| List<ZNRecord> recordList = Lists.newArrayList(); |
| for (InstanceConfig instanceConfig : instanceConfigsMap.values()) { |
| recordList.add(instanceConfig.getRecord()); |
| } |
| ListInstancesWrapper wrapper = new ListInstancesWrapper(); |
| wrapper.instanceInfo = recordList; |
| wrapper.tagInfo = tagInstanceLists; |
| StringRepresentation representation = |
| new StringRepresentation(ClusterRepresentationUtil.ObjectToJson(wrapper), |
| MediaType.APPLICATION_JSON); |
| |
| return representation; |
| } |
| |
| @Override |
| public Representation post(Representation entity) { |
| try { |
| String clusterName = (String) getRequest().getAttributes().get("clusterName"); |
| JsonParameters jsonParameters = new JsonParameters(entity); |
| String command = jsonParameters.getCommand(); |
| |
| ZkClient zkClient = |
| (ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT); |
| ClusterSetup setupTool = new ClusterSetup(zkClient); |
| |
| if (command.equalsIgnoreCase(ClusterSetup.addInstance) |
| || JsonParameters.CLUSTERSETUP_COMMAND_ALIASES.get(ClusterSetup.addInstance).contains( |
| command)) { |
| if (jsonParameters.getParameter(JsonParameters.INSTANCE_NAME) != null) { |
| setupTool.addInstanceToCluster(clusterName, |
| jsonParameters.getParameter(JsonParameters.INSTANCE_NAME)); |
| } else if (jsonParameters.getParameter(JsonParameters.INSTANCE_NAMES) != null) { |
| setupTool.addInstancesToCluster(clusterName, |
| jsonParameters.getParameter(JsonParameters.INSTANCE_NAMES).split(";")); |
| } else { |
| throw new HelixException("Missing Json paramaters: '" + JsonParameters.INSTANCE_NAME |
| + "' or '" + JsonParameters.INSTANCE_NAMES + "' "); |
| } |
| } else if (command.equalsIgnoreCase(ClusterSetup.swapInstance)) { |
| if (jsonParameters.getParameter(JsonParameters.NEW_INSTANCE) == null |
| || jsonParameters.getParameter(JsonParameters.OLD_INSTANCE) == null) { |
| throw new HelixException("Missing Json paramaters: '" + JsonParameters.NEW_INSTANCE |
| + "' or '" + JsonParameters.OLD_INSTANCE + "' "); |
| } |
| setupTool.swapInstance(clusterName, |
| jsonParameters.getParameter(JsonParameters.OLD_INSTANCE), |
| jsonParameters.getParameter(JsonParameters.NEW_INSTANCE)); |
| } else { |
| throw new HelixException("Unsupported command: " + command + ". Should be one of [" |
| + ClusterSetup.addInstance + ", " + ClusterSetup.swapInstance + "]"); |
| } |
| |
| getResponse().setEntity(getInstancesRepresentation(clusterName)); |
| getResponse().setStatus(Status.SUCCESS_OK); |
| } catch (Exception e) { |
| getResponse().setEntity(ClusterRepresentationUtil.getErrorAsJsonStringFromException(e), |
| MediaType.APPLICATION_JSON); |
| getResponse().setStatus(Status.SUCCESS_OK); |
| LOG.error("", e); |
| } |
| return null; |
| } |
| |
| /** |
| * A wrapper class for quick serialization of the data presented by this call |
| */ |
| public static class ListInstancesWrapper { |
| public List<ZNRecord> instanceInfo; |
| public Map<String, List<String>> tagInfo; |
| } |
| } |