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.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import org.apache.helix.HelixDataAccessor;
import org.apache.helix.HelixException;
import org.apache.helix.manager.zk.ZkClient;
import org.apache.helix.model.InstanceConfig;
import org.apache.helix.model.LiveInstance;
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.Request;
import org.restlet.Response;
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 InstancesResource extends ServerResource {
private final static Logger LOG = Logger.getLogger(InstancesResource.class);
public InstancesResource() {
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");
presentation = getInstancesRepresentation(clusterName);
}
catch (Exception e) {
String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e);
presentation = new StringRepresentation(error, MediaType.APPLICATION_JSON);
LOG.error("", e);
}
return presentation;
}
StringRepresentation getInstancesRepresentation(String clusterName)
throws JsonGenerationException, JsonMappingException, IOException {
ZkClient zkClient = (ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
HelixDataAccessor accessor =
ClusterRepresentationUtil.getClusterDataAccessor(zkClient, clusterName);
Map<String, LiveInstance> liveInstancesMap =
accessor.getChildValuesMap(accessor.keyBuilder().liveInstances());
Map<String, InstanceConfig> instanceConfigsMap =
accessor.getChildValuesMap(accessor.keyBuilder().instanceConfigs());
Map<String, List<String>> tagInstanceLists = new TreeMap<String, List<String>>();
for (String instanceName : instanceConfigsMap.keySet()) {
boolean isAlive = liveInstancesMap.containsKey(instanceName);
instanceConfigsMap.get(instanceName).getRecord().setSimpleField("Alive", isAlive + "");
InstanceConfig config = instanceConfigsMap.get(instanceName);
for (String tag : config.getTags()) {
if (!tagInstanceLists.containsKey(tag)) {
tagInstanceLists.put(tag, new LinkedList<String>());
}
if (!tagInstanceLists.get(tag).contains(instanceName)) {
tagInstanceLists.get(tag).add(instanceName);
}
}
}
StringRepresentation representation =
new StringRepresentation(
ClusterRepresentationUtil.ObjectToJson(instanceConfigsMap.values())
+ ClusterRepresentationUtil.ObjectToJson(tagInstanceLists),
MediaType.APPLICATION_JSON);
return representation;
}
@Override
public Representation post(Representation entity) {
try {
String clusterName = (String) getRequest().getAttributes().get("clusterName");
JsonParameters jsonParameters = new JsonParameters(entity);
String command = jsonParameters.getCommand();
ZkClient zkClient =
(ZkClient) getContext().getAttributes().get(RestAdminApplication.ZKCLIENT);
ClusterSetup setupTool = new ClusterSetup(zkClient);
if (command.equalsIgnoreCase(ClusterSetup.addInstance)
|| JsonParameters.CLUSTERSETUP_COMMAND_ALIASES.get(ClusterSetup.addInstance).contains(
command)) {
if (jsonParameters.getParameter(JsonParameters.INSTANCE_NAME) != null) {
setupTool.addInstanceToCluster(clusterName,
jsonParameters.getParameter(JsonParameters.INSTANCE_NAME));
} else if (jsonParameters.getParameter(JsonParameters.INSTANCE_NAMES) != null) {
setupTool.addInstancesToCluster(clusterName,
jsonParameters.getParameter(JsonParameters.INSTANCE_NAMES).split(";"));
} else {
throw new HelixException("Missing Json paramaters: '" + JsonParameters.INSTANCE_NAME
+ "' or '" + JsonParameters.INSTANCE_NAMES + "' ");
}
} else if (command.equalsIgnoreCase(ClusterSetup.swapInstance)) {
if (jsonParameters.getParameter(JsonParameters.NEW_INSTANCE) == null
|| jsonParameters.getParameter(JsonParameters.OLD_INSTANCE) == null) {
throw new HelixException("Missing Json paramaters: '" + JsonParameters.NEW_INSTANCE
+ "' or '" + JsonParameters.OLD_INSTANCE + "' ");
}
setupTool.swapInstance(clusterName,
jsonParameters.getParameter(JsonParameters.OLD_INSTANCE),
jsonParameters.getParameter(JsonParameters.NEW_INSTANCE));
} else {
throw new HelixException("Unsupported command: " + command + ". Should be one of ["
+ ClusterSetup.addInstance + ", " + ClusterSetup.swapInstance + "]");
}
getResponse().setEntity(getInstancesRepresentation(clusterName));
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;
}
}