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.ZNRecord;
import org.apache.helix.PropertyKey.Builder;
import org.apache.helix.manager.zk.ZkClient;
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.Context;
import org.restlet.data.MediaType;
import org.restlet.data.Request;
import org.restlet.data.Response;
import org.restlet.data.Status;
import org.restlet.resource.Representation;
import org.restlet.resource.Resource;
import org.restlet.resource.StringRepresentation;
import org.restlet.resource.Variant;
public class ClusterResource extends Resource
{
public ClusterResource(Context context, Request request, Response response)
{
super(context, request, response);
getVariants().add(new Variant(MediaType.TEXT_PLAIN));
getVariants().add(new Variant(MediaType.APPLICATION_JSON));
}
@Override
public boolean allowGet()
{
return true;
}
@Override
public boolean allowPost()
{
return true;
}
@Override
public boolean allowPut()
{
return false;
}
@Override
public boolean allowDelete()
{
return true;
}
@Override
public Representation represent(Variant variant)
{
StringRepresentation presentation = null;
try
{
String clusterName = (String) getRequest().getAttributes().get("clusterName");
presentation = getClusterRepresentation(clusterName);
}
catch (Exception e)
{
String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e);
presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON);
e.printStackTrace();
}
return presentation;
}
StringRepresentation getClusterRepresentation(String clusterName) throws JsonGenerationException,
JsonMappingException,
IOException
{
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.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;
}
@Override
public void acceptRepresentation(Representation entity)
{
try
{
String clusterName = (String) getRequest().getAttributes().get("clusterName");
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.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);
}
}
@Override
public void removeRepresentations()
{
try
{
String clusterName = (String) getRequest().getAttributes().get("clusterName");
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.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);
}
}
}