| 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.List; |
| |
| import org.apache.helix.HelixDataAccessor; |
| import org.apache.helix.HelixException; |
| import org.apache.helix.PropertyKey.Builder; |
| import org.apache.helix.zookeeper.datamodel.ZNRecord; |
| import org.apache.helix.zookeeper.impl.client.ZkClient; |
| import org.apache.helix.model.LiveInstance; |
| import org.apache.helix.tools.ClusterSetup; |
| 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; |
| |
| /** |
| * Class for server-side resource at <code> "/clusters/{clusterName}" |
| * <p> |
| * <li>GET list cluster information |
| * <li>POST activate/deactivate a cluster in distributed controller mode |
| * <li>DELETE remove a cluster |
| */ |
| public class ClusterResource extends ServerResource { |
| private final static Logger LOG = LoggerFactory.getLogger(ClusterResource.class); |
| |
| public ClusterResource() { |
| getVariants().add(new Variant(MediaType.TEXT_PLAIN)); |
| getVariants().add(new Variant(MediaType.APPLICATION_JSON)); |
| setNegotiated(false); |
| } |
| |
| /** |
| * List cluster information |
| * <p> |
| * Usage: <code> curl http://{host:port}/clusters/{clusterName} |
| */ |
| @Override |
| public Representation get() { |
| StringRepresentation presentation = null; |
| try { |
| String clusterName = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CLUSTER_NAME); |
| presentation = getClusterRepresentation(clusterName); |
| } catch (Exception e) { |
| String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e); |
| presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON); |
| LOG.error("Exception in get cluster", e); |
| } |
| return presentation; |
| } |
| |
| StringRepresentation getClusterRepresentation(String clusterName) throws JsonGenerationException, |
| JsonMappingException, IOException { |
| ZkClient zkClient = |
| ResourceUtil.getAttributeFromCtx(getContext(), ResourceUtil.ContextKey.ZKCLIENT); |
| ClusterSetup setupTool = new ClusterSetup(zkClient); |
| List<String> instances = |
| setupTool.getClusterManagementTool().getInstancesInCluster(clusterName); |
| |
| ZNRecord clusterSummayRecord = new ZNRecord("Cluster Summary"); |
| clusterSummayRecord.setListField("participants", instances); |
| |
| List<String> resources = |
| setupTool.getClusterManagementTool().getResourcesInCluster(clusterName); |
| clusterSummayRecord.setListField("resources", resources); |
| |
| List<String> models = setupTool.getClusterManagementTool().getStateModelDefs(clusterName); |
| clusterSummayRecord.setListField("stateModelDefs", models); |
| |
| HelixDataAccessor accessor = |
| ClusterRepresentationUtil.getClusterDataAccessor(zkClient, clusterName); |
| Builder keyBuilder = accessor.keyBuilder(); |
| |
| LiveInstance leader = accessor.getProperty(keyBuilder.controllerLeader()); |
| if (leader != null) { |
| clusterSummayRecord.setSimpleField("LEADER", leader.getInstanceName()); |
| } else { |
| clusterSummayRecord.setSimpleField("LEADER", ""); |
| } |
| StringRepresentation representation = |
| new StringRepresentation(ClusterRepresentationUtil.ZNRecordToJson(clusterSummayRecord), |
| MediaType.APPLICATION_JSON); |
| |
| return representation; |
| } |
| |
| /** |
| * Activate/deactivate a cluster in distributed controller mode |
| * <p> |
| * Usage: <code> curl -d 'jsonParameters= |
| * {"command":"activateCluster","grandCluster":"{controllerCluster}","enabled":"{true/false}"}' -H |
| * "Content-Type: application/json" http://{host:port}/clusters/{clusterName}} |
| */ |
| @Override |
| public Representation post(Representation entity) { |
| try { |
| String clusterName = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CLUSTER_NAME); |
| ZkClient zkClient = |
| ResourceUtil.getAttributeFromCtx(getContext(), ResourceUtil.ContextKey.ZKCLIENT); |
| ClusterSetup setupTool = new ClusterSetup(zkClient); |
| |
| JsonParameters jsonParameters = new JsonParameters(entity); |
| String command = jsonParameters.getCommand(); |
| |
| if (command == null) { |
| throw new HelixException("Could NOT find 'command' in parameterMap: " |
| + jsonParameters._parameterMap); |
| } else if (command.equalsIgnoreCase(ClusterSetup.activateCluster) |
| || JsonParameters.CLUSTERSETUP_COMMAND_ALIASES.get(ClusterSetup.activateCluster) |
| .contains(command)) { |
| jsonParameters.verifyCommand(ClusterSetup.activateCluster); |
| |
| boolean enabled = true; |
| if (jsonParameters.getParameter(JsonParameters.ENABLED) != null) { |
| enabled = Boolean.parseBoolean(jsonParameters.getParameter(JsonParameters.ENABLED)); |
| } |
| |
| String grandCluster = jsonParameters.getParameter(JsonParameters.GRAND_CLUSTER); |
| |
| setupTool.activateCluster(clusterName, grandCluster, enabled); |
| } else if (command.equalsIgnoreCase(ClusterSetup.expandCluster)) { |
| setupTool.expandCluster(clusterName); |
| } else { |
| throw new HelixException("Unsupported command: " + command + ". Should be one of [" |
| + ClusterSetup.activateCluster + ", " + ClusterSetup.expandCluster + "]"); |
| } |
| getResponse().setEntity(getClusterRepresentation(clusterName)); |
| getResponse().setStatus(Status.SUCCESS_OK); |
| } catch (Exception e) { |
| getResponse().setEntity(ClusterRepresentationUtil.getErrorAsJsonStringFromException(e), |
| MediaType.APPLICATION_JSON); |
| getResponse().setStatus(Status.SUCCESS_OK); |
| } |
| return getResponseEntity(); |
| } |
| |
| /** |
| * Remove a cluster |
| * <p> |
| * Usage: <code> curl -X DELETE http://{host:port}/clusters/{clusterName} |
| */ |
| @Override |
| public Representation delete() { |
| try { |
| String clusterName = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CLUSTER_NAME); |
| ZkClient zkClient = |
| ResourceUtil.getAttributeFromCtx(getContext(), ResourceUtil.ContextKey.ZKCLIENT); |
| ClusterSetup setupTool = new ClusterSetup(zkClient); |
| setupTool.deleteCluster(clusterName); |
| getResponse().setStatus(Status.SUCCESS_OK); |
| } catch (Exception e) { |
| getResponse().setEntity(ClusterRepresentationUtil.getErrorAsJsonStringFromException(e), |
| MediaType.APPLICATION_JSON); |
| getResponse().setStatus(Status.SUCCESS_OK); |
| } |
| return null; |
| } |
| } |