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.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 InstanceResource extends Resource
{
private final static Logger LOG = Logger.getLogger(InstanceResource.class);
public InstanceResource(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
{
presentation = getInstanceRepresentation();
}
catch (Exception e)
{
String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e);
presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON);
LOG.error("", e);
}
return presentation;
}
StringRepresentation getInstanceRepresentation() throws JsonGenerationException,
JsonMappingException,
IOException
{
String clusterName = (String) getRequest().getAttributes().get("clusterName");
String instanceName = (String) getRequest().getAttributes().get("instanceName");
Builder keyBuilder = new PropertyKey.Builder(clusterName);
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
String message =
ClusterRepresentationUtil.getClusterPropertyAsString(zkClient,
clusterName,
MediaType.APPLICATION_JSON,
keyBuilder.instanceConfig(instanceName));
StringRepresentation representation =
new StringRepresentation(message, MediaType.APPLICATION_JSON);
return representation;
}
@Override
public void acceptRepresentation(Representation entity)
{
try
{
String clusterName = (String) getRequest().getAttributes().get("clusterName");
String instanceName = (String) getRequest().getAttributes().get("instanceName");
JsonParameters jsonParameters = new JsonParameters(entity);
String command = jsonParameters.getCommand();
if (command.equalsIgnoreCase(ClusterSetup.enableInstance))
{
jsonParameters.verifyCommand(ClusterSetup.enableInstance);
boolean enabled =
Boolean.parseBoolean(jsonParameters.getParameter(JsonParameters.ENABLED));
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
ClusterSetup setupTool = new ClusterSetup(zkClient);
setupTool.getClusterManagementTool().enableInstance(clusterName,
instanceName,
enabled);
}
else if (command.equalsIgnoreCase(ClusterSetup.enablePartition))
{
jsonParameters.verifyCommand(ClusterSetup.enablePartition);
boolean enabled =
Boolean.parseBoolean(jsonParameters.getParameter(JsonParameters.ENABLED));
String[] partitions =
jsonParameters.getParameter(JsonParameters.PARTITION).split(";");
String resource =
jsonParameters.getParameter(JsonParameters.RESOURCE);
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
ClusterSetup setupTool = new ClusterSetup(zkClient);
setupTool.getClusterManagementTool().enablePartition(enabled,
clusterName,
instanceName,
resource,
Arrays.asList(partitions));
}
else if (command.equalsIgnoreCase(ClusterSetup.resetPartition))
{
jsonParameters.verifyCommand(ClusterSetup.resetPartition);
String resource =
jsonParameters.getParameter(JsonParameters.RESOURCE);
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
ClusterSetup setupTool = new ClusterSetup(zkClient);
String[] partitionNames =
jsonParameters.getParameter(JsonParameters.PARTITION).split("\\s+");
setupTool.getClusterManagementTool()
.resetPartition(clusterName,
instanceName,
resource,
Arrays.asList(partitionNames));
}
else if (command.equalsIgnoreCase(ClusterSetup.resetInstance))
{
jsonParameters.verifyCommand(ClusterSetup.resetInstance);
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
ClusterSetup setupTool = new ClusterSetup(zkClient);
setupTool.getClusterManagementTool().resetInstance(clusterName,
Arrays.asList(instanceName));
}
else
{
throw new HelixException("Unsupported command: " + command
+ ". Should be one of [" + ClusterSetup.enableInstance + ", "
+ ClusterSetup.enablePartition + ", " + ClusterSetup.resetInstance + "]");
}
getResponse().setEntity(getInstanceRepresentation());
getResponse().setStatus(Status.SUCCESS_OK);
}
catch (Exception e)
{
getResponse().setEntity(ClusterRepresentationUtil.getErrorAsJsonStringFromException(e),
MediaType.APPLICATION_JSON);
getResponse().setStatus(Status.SUCCESS_OK);
LOG.error("", e);
}
}
@Override
public void removeRepresentations()
{
try
{
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);
setupTool.dropInstanceFromCluster(clusterName, instanceName);
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 remove", e);
}
}
}