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.HelixException; | |
import org.apache.helix.zookeeper.datamodel.ZNRecord; | |
import org.apache.helix.zookeeper.impl.client.ZkClient; | |
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" | |
* <p> | |
* <li>GET list all Helix clusters | |
* <li>POST add a new cluster | |
*/ | |
public class ClustersResource extends ServerResource { | |
private final static Logger LOG = LoggerFactory.getLogger(ClustersResource.class); | |
public ClustersResource() { | |
getVariants().add(new Variant(MediaType.TEXT_PLAIN)); | |
getVariants().add(new Variant(MediaType.APPLICATION_JSON)); | |
setNegotiated(false); | |
} | |
/** | |
* List all Helix clusters | |
* <p> | |
* Usage: <code> curl http://{host:port}/clusters | |
*/ | |
@Override | |
public Representation get() { | |
StringRepresentation presentation = null; | |
try { | |
presentation = getClustersRepresentation(); | |
} catch (Exception e) { | |
LOG.error("Exception in get all clusters", e); | |
String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e); | |
presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON); | |
} | |
return presentation; | |
} | |
StringRepresentation getClustersRepresentation() throws JsonGenerationException, | |
JsonMappingException, IOException { | |
ZkClient zkClient = | |
ResourceUtil.getAttributeFromCtx(getContext(), ResourceUtil.ContextKey.ZKCLIENT); | |
ClusterSetup setupTool = new ClusterSetup(zkClient); | |
List<String> clusters = setupTool.getClusterManagementTool().getClusters(); | |
ZNRecord clustersRecord = new ZNRecord("Clusters Summary"); | |
clustersRecord.setListField("clusters", clusters); | |
StringRepresentation representation = | |
new StringRepresentation(ClusterRepresentationUtil.ZNRecordToJson(clustersRecord), | |
MediaType.APPLICATION_JSON); | |
return representation; | |
} | |
/** | |
* Add a new Helix cluster | |
* <p> | |
* Usage: <code> curl -d 'jsonParameters={"command":"addCluster","clusterName":"{clusterName}"}' -H | |
* "Content-Type: application/json" http://{host:port}/clusters | |
*/ | |
@Override | |
public Representation post(Representation entity) { | |
try { | |
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.addCluster)) { | |
jsonParameters.verifyCommand(ClusterSetup.addCluster); | |
ZkClient zkClient = | |
ResourceUtil.getAttributeFromCtx(getContext(), ResourceUtil.ContextKey.ZKCLIENT); | |
ClusterSetup setupTool = new ClusterSetup(zkClient); | |
setupTool.addCluster(jsonParameters.getParameter(JsonParameters.CLUSTER_NAME), false); | |
} else { | |
throw new HelixException("Unsupported command: " + command + ". Should be one of [" | |
+ ClusterSetup.addCluster + "]"); | |
} | |
getResponse().setEntity(getClustersRepresentation()); | |
getResponse().setStatus(Status.SUCCESS_OK); | |
} catch (Exception e) { | |
getResponse().setEntity(ClusterRepresentationUtil.getErrorAsJsonStringFromException(e), | |
MediaType.APPLICATION_JSON); | |
getResponse().setStatus(Status.SUCCESS_OK); | |
LOG.error("Error in posting " + entity, e); | |
} | |
return null; | |
} | |
@Override | |
public Representation delete() { | |
return null; | |
} | |
} |