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.net.InetAddress;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import org.apache.helix.HelixDataAccessor;
import org.apache.helix.HelixException;
import org.apache.helix.InstanceType;
import org.apache.helix.PropertyPathConfig;
import org.apache.helix.PropertyType;
import org.apache.helix.api.id.MessageId;
import org.apache.helix.api.id.SessionId;
import org.apache.helix.manager.zk.DefaultSchedulerMessageHandlerFactory;
import org.apache.helix.manager.zk.ZkClient;
import org.apache.helix.model.LiveInstance;
import org.apache.helix.model.Message;
import org.apache.helix.model.Message.MessageType;
import org.apache.helix.tools.ClusterSetup;
import org.apache.helix.webapp.RestAdminApplication;
import org.apache.log4j.Logger;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.restlet.data.Form;
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;
/**
* This resource can be used to send scheduler tasks to the controller.
*/
public class SchedulerTasksResource extends ServerResource {
private final static Logger LOG = Logger.getLogger(SchedulerTasksResource.class);
public static String CRITERIA = "Criteria";
public static String MESSAGETEMPLATE = "MessageTemplate";
public static String TASKQUEUENAME = "TaskQueueName";
public SchedulerTasksResource() {
getVariants().add(new Variant(MediaType.TEXT_PLAIN));
getVariants().add(new Variant(MediaType.APPLICATION_JSON));
setNegotiated(false);
}
@Override
public Representation get() {
StringRepresentation presentation = null;
try {
presentation = getSchedulerTasksRepresentation();
}
catch (Exception e) {
String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e);
presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON);
LOG.error("", e);
}
return presentation;
}
StringRepresentation getSchedulerTasksRepresentation() throws JsonGenerationException,
JsonMappingException, IOException {
String clusterName = (String) getRequest().getAttributes().get("clusterName");
String instanceName = (String) getRequest().getAttributes().get("instanceName");
ZkClient zkClient = (ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
ClusterSetup setupTool = new ClusterSetup(zkClient);
List<String> instances =
setupTool.getClusterManagementTool().getInstancesInCluster(clusterName);
HelixDataAccessor accessor =
ClusterRepresentationUtil.getClusterDataAccessor(zkClient, clusterName);
LiveInstance liveInstance =
accessor.getProperty(accessor.keyBuilder().liveInstance(instanceName));
StringRepresentation representation = new StringRepresentation("");// (ClusterRepresentationUtil.ObjectToJson(instanceConfigs),
// MediaType.APPLICATION_JSON);
return representation;
}
@Override
public Representation post(Representation entity) {
try {
String clusterName = (String) getRequest().getAttributes().get("clusterName");
Form form = new Form(entity);
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
String msgTemplateString =
ClusterRepresentationUtil.getFormJsonParameterString(form, MESSAGETEMPLATE);
if (msgTemplateString == null) {
throw new HelixException("SchedulerTasksResource need to have MessageTemplate specified.");
}
Map<String, String> messageTemplate =
ClusterRepresentationUtil.getFormJsonParameters(form, MESSAGETEMPLATE);
String criteriaString = ClusterRepresentationUtil.getFormJsonParameterString(form, CRITERIA);
if (criteriaString == null) {
throw new HelixException("SchedulerTasksResource need to have Criteria specified.");
}
HelixDataAccessor accessor =
ClusterRepresentationUtil.getClusterDataAccessor(zkClient, clusterName);
LiveInstance leader = accessor.getProperty(accessor.keyBuilder().controllerLeader());
if (leader == null) {
throw new HelixException("There is no leader for the cluster " + clusterName);
}
Message schedulerMessage =
new Message(MessageType.SCHEDULER_MSG, MessageId.from(UUID.randomUUID().toString()));
schedulerMessage.getRecord().getSimpleFields().put(CRITERIA, criteriaString);
schedulerMessage.getRecord().getMapFields().put(MESSAGETEMPLATE, messageTemplate);
schedulerMessage.setTgtSessionId(SessionId.from(leader.getTypedSessionId().stringify()));
schedulerMessage.setTgtName("CONTROLLER");
schedulerMessage.setSrcInstanceType(InstanceType.CONTROLLER);
String taskQueueName =
ClusterRepresentationUtil.getFormJsonParameterString(form, TASKQUEUENAME);
if (taskQueueName != null && taskQueueName.length() > 0) {
schedulerMessage.getRecord().setSimpleField(
DefaultSchedulerMessageHandlerFactory.SCHEDULER_TASK_QUEUE, taskQueueName);
}
accessor.setProperty(
accessor.keyBuilder().controllerMessage(schedulerMessage.getMessageId().stringify()),
schedulerMessage);
Map<String, String> resultMap = new HashMap<String, String>();
resultMap.put("StatusUpdatePath", PropertyPathConfig.getPath(
PropertyType.STATUSUPDATES_CONTROLLER, clusterName, MessageType.SCHEDULER_MSG.toString(),
schedulerMessage.getMessageId().stringify()));
resultMap.put("MessageType", Message.MessageType.SCHEDULER_MSG.toString());
resultMap.put("MsgId", schedulerMessage.getMessageId().stringify());
// Assemble the rest URL for task status update
String ipAddress = InetAddress.getLocalHost().getCanonicalHostName();
String url =
"http://" + ipAddress + ":" + getContext().getAttributes().get(RestAdminApplication.PORT)
+ "/clusters/" + clusterName + "/Controller/statusUpdates/SCHEDULER_MSG/"
+ schedulerMessage.getMessageId();
resultMap.put("statusUpdateUrl", url);
getResponse().setEntity(ClusterRepresentationUtil.ObjectToJson(resultMap),
MediaType.APPLICATION_JSON);
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;
}
}