| 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.util.Map; |
| |
| import org.apache.helix.HelixAdmin; |
| import org.apache.helix.zookeeper.datamodel.ZNRecord; |
| import org.apache.helix.manager.zk.ZKHelixAdmin; |
| import org.apache.helix.zookeeper.impl.client.ZkClient; |
| import org.apache.helix.model.ClusterConstraints.ConstraintType; |
| import org.apache.helix.tools.ClusterSetup; |
| 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/{clusterName}/constraints/{constraintType}" |
| * <p> |
| * <li>GET list all constraints |
| * <li>POST set constraints |
| * <li>DELETE remove constraints |
| */ |
| public class ConstraintResource extends ServerResource { |
| private final static Logger LOG = LoggerFactory.getLogger(ConstraintResource.class); |
| |
| public ConstraintResource() { |
| getVariants().add(new Variant(MediaType.TEXT_PLAIN)); |
| getVariants().add(new Variant(MediaType.APPLICATION_JSON)); |
| setNegotiated(false); |
| } |
| |
| /** |
| * List all constraints |
| * <p> |
| * Usage: <code>curl http://{host:port}/clusters/{clusterName}/constraints/MESSAGE_CONSTRAINT |
| */ |
| @Override |
| public Representation get() { |
| StringRepresentation representation = null; |
| String clusterName = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CLUSTER_NAME); |
| String constraintTypeStr = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CONSTRAINT_TYPE); |
| String constraintId = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CONSTRAINT_ID); |
| |
| try { |
| ConstraintType constraintType = ConstraintType.valueOf(constraintTypeStr); |
| ZkClient zkClient = |
| ResourceUtil.getAttributeFromCtx(getContext(), ResourceUtil.ContextKey.ZKCLIENT); |
| HelixAdmin admin = new ZKHelixAdmin(zkClient); |
| |
| ZNRecord record = admin.getConstraints(clusterName, constraintType).getRecord(); |
| if (constraintId == null) { |
| // get all message constraints |
| representation = |
| new StringRepresentation(ClusterRepresentationUtil.ZNRecordToJson(record), |
| MediaType.APPLICATION_JSON); |
| } else { |
| // get a specific constraint |
| Map<String, String> constraint = record.getMapField(constraintId); |
| if (constraint == null) { |
| representation = |
| new StringRepresentation("No constraint of type: " + constraintType |
| + " associated with id: " + constraintId, MediaType.APPLICATION_JSON); |
| } else { |
| ZNRecord subRecord = new ZNRecord(record.getId()); |
| subRecord.setMapField(constraintId, constraint); |
| representation = |
| new StringRepresentation(ClusterRepresentationUtil.ZNRecordToJson(subRecord), |
| MediaType.APPLICATION_JSON); |
| } |
| } |
| } catch (IllegalArgumentException e) { |
| representation = |
| new StringRepresentation("constraint-type: " + constraintTypeStr + " not recognized.", |
| MediaType.APPLICATION_JSON); |
| } catch (Exception e) { |
| String error = ClusterRepresentationUtil.getErrorAsJsonStringFromException(e); |
| representation = new StringRepresentation(error, MediaType.APPLICATION_JSON); |
| LOG.error("Exception get constraints", e); |
| } |
| |
| return representation; |
| } |
| |
| /** |
| * Set constraints |
| * <p> |
| * Usage: |
| * <code>curl -d 'jsonParameters={"constraintAttributes":"RESOURCE={resource},CONSTRAINT_VALUE={1}"}' |
| * -H "Content-Type: application/json" http://{host:port}/clusters/{cluster}/constraints/MESSAGE_CONSTRAINT/{constraintId} |
| */ |
| @Override |
| public Representation post(Representation entity) { |
| String clusterName = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CLUSTER_NAME); |
| String constraintTypeStr = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CONSTRAINT_TYPE); |
| String constraintId = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CONSTRAINT_ID); |
| |
| try { |
| ZkClient zkClient = |
| ResourceUtil.getAttributeFromCtx(getContext(), ResourceUtil.ContextKey.ZKCLIENT); |
| ClusterSetup setupTool = new ClusterSetup(zkClient); |
| JsonParameters jsonParameters = new JsonParameters(entity); |
| |
| String constraintAttrStr = jsonParameters.getParameter(JsonParameters.CONSTRAINT_ATTRIBUTES); |
| setupTool.setConstraint(clusterName, constraintTypeStr, constraintId, constraintAttrStr); |
| |
| } catch (Exception e) { |
| LOG.error("Error in posting " + entity, e); |
| getResponse().setEntity(ClusterRepresentationUtil.getErrorAsJsonStringFromException(e), |
| MediaType.APPLICATION_JSON); |
| getResponse().setStatus(Status.SUCCESS_OK); |
| } |
| return null; |
| } |
| |
| /** |
| * Remove constraints |
| * <p> |
| * Usage: |
| * <code>curl -X DELETE http://{host:port}/clusters/{cluster}/constraints/MESSAGE_CONSTRAINT/{constraintId} |
| */ |
| @Override |
| public Representation delete() { |
| String clusterName = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CLUSTER_NAME); |
| String constraintTypeStr = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CONSTRAINT_TYPE); |
| String constraintId = |
| ResourceUtil.getAttributeFromRequest(getRequest(), ResourceUtil.RequestKey.CONSTRAINT_ID); |
| |
| try { |
| ZkClient zkClient = |
| ResourceUtil.getAttributeFromCtx(getContext(), ResourceUtil.ContextKey.ZKCLIENT); |
| ClusterSetup setupTool = new ClusterSetup(zkClient); |
| |
| setupTool.removeConstraint(clusterName, constraintTypeStr, constraintId); |
| } catch (Exception e) { |
| LOG.error("Error in delete constraint", e); |
| getResponse().setEntity(ClusterRepresentationUtil.getErrorAsJsonStringFromException(e), |
| MediaType.APPLICATION_JSON); |
| getResponse().setStatus(Status.SUCCESS_OK); |
| } |
| return null; |
| } |
| } |