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.Arrays;
import org.apache.helix.HelixException;
import org.apache.helix.PropertyKey;
import org.apache.helix.PropertyKey.Builder;
import org.apache.helix.manager.zk.ZkClient;
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.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;
public class ResourceGroupResource extends ServerResource {
private final static Logger LOG = Logger.getLogger(ResourceGroupResource.class);
public ResourceGroupResource() {
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");
String resourceName = (String) getRequest().getAttributes().get("resourceName");
presentation = getIdealStateRepresentation(clusterName, resourceName);
}
catch (Exception e) {
String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e);
presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON);
LOG.error("", e);
}
return presentation;
}
StringRepresentation getIdealStateRepresentation(String clusterName, String resourceName)
throws JsonGenerationException, JsonMappingException, IOException {
Builder keyBuilder = new PropertyKey.Builder(clusterName);
ZkClient zkClient = (ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
String message =
ClusterRepresentationUtil.getClusterPropertyAsString(zkClient, clusterName,
keyBuilder.idealStates(resourceName), MediaType.APPLICATION_JSON);
StringRepresentation representation =
new StringRepresentation(message, MediaType.APPLICATION_JSON);
return representation;
}
@Override
public Representation delete() {
try {
String clusterName = (String) getRequest().getAttributes().get("clusterName");
String resourceGroupName = (String) getRequest().getAttributes().get("resourceName");
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
ClusterSetup setupTool = new ClusterSetup(zkClient);
setupTool.dropResourceFromCluster(clusterName, resourceGroupName);
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;
}
@Override
public Representation post(Representation entity) {
try {
String clusterName = (String) getRequest().getAttributes().get("clusterName");
String resourceName = (String) getRequest().getAttributes().get("resourceName");
JsonParameters jsonParameters = new JsonParameters(entity);
String command = jsonParameters.getCommand();
if (command.equalsIgnoreCase(ClusterSetup.resetResource)) {
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
ClusterSetup setupTool = new ClusterSetup(zkClient);
setupTool.getClusterManagementTool()
.resetResource(clusterName, Arrays.asList(resourceName));
} else if (command.equalsIgnoreCase(ClusterSetup.enableResource)) {
jsonParameters.verifyCommand(ClusterSetup.enableResource);
boolean enabled = Boolean.parseBoolean(jsonParameters.getParameter(JsonParameters.ENABLED));
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
ClusterSetup setupTool = new ClusterSetup(zkClient);
setupTool.getClusterManagementTool().enableResource(clusterName, resourceName, enabled);
} else {
throw new HelixException("Unsupported command: " + command + ". Should be one of ["
+ ClusterSetup.resetResource + "]");
}
} catch (Exception e) {
getResponse().setEntity(ClusterRepresentationUtil.getErrorAsJsonStringFromException(e),
MediaType.APPLICATION_JSON);
getResponse().setStatus(Status.SUCCESS_OK);
LOG.error("", e);
}
return null;
}
}