org.apache.ambari.view.slider.rest.client.AmbariHttpClient.java Source code

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/**
 * 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.
 */

package org.apache.ambari.view.slider.rest.client;

import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.ambari.view.slider.clients.AmbariClient;
import org.apache.ambari.view.slider.clients.AmbariCluster;
import org.apache.ambari.view.slider.clients.AmbariClusterInfo;
import org.apache.ambari.view.slider.clients.AmbariHostComponent;
import org.apache.ambari.view.slider.clients.AmbariHostInfo;
import org.apache.ambari.view.slider.clients.AmbariService;
import org.apache.ambari.view.slider.clients.AmbariServiceInfo;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.log4j.Logger;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.stream.JsonReader;

public class AmbariHttpClient extends BaseHttpClient implements AmbariClient {

    private static final Logger logger = Logger.getLogger(AmbariHttpClient.class);

    public AmbariHttpClient(String url, String userId, String password) {
        super(url, userId, password);
    }

    @SuppressWarnings("deprecation")
    private RuntimeException createRuntimeException(HttpException httpException) {
        String message = httpException.getMessage();
        try {
            JsonElement jsonElement = new JsonParser()
                    .parse(new JsonReader(new StringReader(httpException.getMessage())));
            if (jsonElement != null && jsonElement.getAsJsonObject().has("message")) {
                message = jsonElement.getAsJsonObject().get("message").getAsString();
            }
        } catch (Throwable t) {
        }
        if (httpException.getReasonCode() != HttpStatus.SC_OK) {
            message = httpException.getReasonCode() + " " + httpException.getReason() + ": " + message;
        }
        return new RuntimeException(message, httpException);
    }

    /**
     * Provides the first cluster defined on this Ambari server.
     * 
     * @return
     */
    public AmbariClusterInfo getClusterInfo() {
        try {
            JsonElement jsonElement = doGetJson("/api/v1/clusters");
            if (jsonElement == null) {
                return null;
            }
            JsonObject jsonObject = jsonElement.getAsJsonObject();
            JsonArray clustersArray = jsonObject.get("items").getAsJsonArray();
            if (clustersArray.size() > 0) {
                AmbariClusterInfo cluster = new AmbariClusterInfo();
                JsonObject clusterObj = clustersArray.get(0).getAsJsonObject().get("Clusters").getAsJsonObject();
                cluster.setName(clusterObj.get("cluster_name").getAsString());
                cluster.setVersion(clusterObj.get("version").getAsString());
                return cluster;
            }
        } catch (HttpException e) {
            logger.warn("Unable to determine Ambari clusters", e);
            throw createRuntimeException(e);
        } catch (IOException e) {
            logger.warn("Unable to determine Ambari clusters", e);
            throw new RuntimeException(e.getMessage(), e);
        }
        return null;
    }

    /**
     * Provides the first cluster defined on this Ambari server.
     * 
     * @return
     */
    public Map<String, String> getAmbariServerConfigs() {
        Map<String, String> configs = new HashMap<String, String>();
        try {
            JsonElement jsonElement = doGetJson("/api/v1/services/AMBARI/components/AMBARI_SERVER");
            if (jsonElement != null && jsonElement.getAsJsonObject().has("RootServiceComponents") && jsonElement
                    .getAsJsonObject().get("RootServiceComponents").getAsJsonObject().has("properties")) {
                JsonObject ambariProperties = jsonElement.getAsJsonObject().get("RootServiceComponents")
                        .getAsJsonObject().get("properties").getAsJsonObject();
                for (Entry<String, JsonElement> entry : ambariProperties.entrySet()) {
                    if (entry.getValue().isJsonPrimitive()) {
                        configs.put(entry.getKey(), entry.getValue().getAsString());
                    }
                }
            }
        } catch (HttpException e) {
            logger.warn("Unable to determine Ambari clusters", e);
        } catch (IOException e) {
            logger.warn("Unable to determine Ambari clusters", e);
        }
        return configs;
    }

    public AmbariCluster getCluster(AmbariClusterInfo clusterInfo) {
        if (clusterInfo != null) {
            try {
                JsonElement jsonElement = doGetJson("/api/v1/clusters/" + clusterInfo.getName()
                        + "?fields=services/ServiceInfo,hosts,Clusters");
                if (jsonElement != null) {
                    AmbariCluster cluster = new AmbariCluster();
                    // desired configs
                    Map<String, String> desiredConfigs = new HashMap<String, String>();
                    JsonObject jsonObject = jsonElement.getAsJsonObject();
                    JsonObject clustersJsonObject = jsonObject.get("Clusters").getAsJsonObject();
                    JsonObject desiredConfigsObj = clustersJsonObject.get("desired_configs").getAsJsonObject();
                    for (Map.Entry<String, JsonElement> entry : desiredConfigsObj.entrySet()) {
                        desiredConfigs.put(entry.getKey(),
                                entry.getValue().getAsJsonObject().get("tag").getAsString());
                    }
                    cluster.setDesiredConfigs(desiredConfigs);
                    cluster.setName(clustersJsonObject.get("cluster_name").getAsString());
                    cluster.setVersion(clustersJsonObject.get("version").getAsString());
                    // services
                    List<AmbariServiceInfo> services = new ArrayList<AmbariServiceInfo>();
                    for (JsonElement svcJson : jsonObject.get("services").getAsJsonArray()) {
                        AmbariServiceInfo si = new AmbariServiceInfo();
                        si.setId(svcJson.getAsJsonObject().get("ServiceInfo").getAsJsonObject().get("service_name")
                                .getAsString());
                        si.setStarted("STARTED".equals(svcJson.getAsJsonObject().get("ServiceInfo")
                                .getAsJsonObject().get("state").getAsString()));
                        services.add(si);
                    }
                    cluster.setServices(services);
                    // hosts
                    List<AmbariHostInfo> hosts = new ArrayList<AmbariHostInfo>();
                    for (JsonElement hostJson : jsonObject.get("hosts").getAsJsonArray()) {
                        AmbariHostInfo hi = new AmbariHostInfo();
                        hi.setHostName(hostJson.getAsJsonObject().get("Hosts").getAsJsonObject().get("host_name")
                                .getAsString());
                        hosts.add(hi);
                    }
                    cluster.setHosts(hosts);
                    return cluster;
                }
            } catch (IllegalStateException e) {
                logger.warn("Unable to determine Ambari cluster details - " + clusterInfo.getName(), e);
                throw new RuntimeException(e.getMessage(), e);
            } catch (HttpException e) {
                logger.warn("Unable to determine Ambari cluster details - " + clusterInfo.getName(), e);
                throw createRuntimeException(e);
            } catch (IOException e) {
                logger.warn("Unable to determine Ambari cluster details - " + clusterInfo.getName(), e);
                throw new RuntimeException(e.getMessage(), e);
            }
        }
        return null;
    }

    public Map<String, String> getConfiguration(AmbariClusterInfo cluster, String configType, String configTag) {
        if (cluster != null && configType != null && configTag != null) {
            try {
                JsonElement jsonElement = doGetJson("/api/v1/clusters/" + cluster.getName()
                        + "/configurations?type=" + configType + "&tag=" + configTag);
                if (jsonElement != null) {
                    JsonObject jsonObject = jsonElement.getAsJsonObject();
                    JsonArray configsArray = jsonObject.get("items").getAsJsonArray();
                    if (configsArray.size() > 0) {
                        JsonObject propertiesObj = configsArray.get(0).getAsJsonObject().get("properties")
                                .getAsJsonObject();
                        Map<String, String> properties = new HashMap<String, String>();
                        for (Map.Entry<String, JsonElement> entry : propertiesObj.entrySet()) {
                            if (entry.getValue().isJsonPrimitive()) {
                                properties.put(entry.getKey(), entry.getValue().getAsString());
                            }
                        }
                        return properties;
                    }
                }
            } catch (HttpException e) {
                logger.warn("Unable to determine Ambari clusters", e);
                throw createRuntimeException(e);
            } catch (IOException e) {
                logger.warn("Unable to determine Ambari clusters", e);
                throw new RuntimeException(e.getMessage(), e);
            }
        }
        return null;
    }

    @Override
    public AmbariService getService(AmbariClusterInfo cluster, String serviceId) {
        if (cluster != null && serviceId != null) {
            try {
                JsonElement jsonElement = doGetJson("/api/v1/clusters/" + cluster.getName() + "/services/"
                        + serviceId + "?fields=ServiceInfo,components/host_components/HostRoles");
                if (jsonElement == null) {
                    return null;
                }
                JsonObject jsonObject = jsonElement.getAsJsonObject();
                AmbariService svc = new AmbariService();
                JsonObject serviceInfoJsonObject = jsonObject.get("ServiceInfo").getAsJsonObject();
                svc.setId(serviceInfoJsonObject.get("service_name").getAsString());
                svc.setStarted("STARTED".equals(serviceInfoJsonObject.get("state").getAsString()));
                svc.setMaintenanceMode(!"OFF".equals(serviceInfoJsonObject.get("maintenance_state").getAsString()));
                Map<String, List<AmbariHostComponent>> componentsToHostComponentsMap = new HashMap<String, List<AmbariHostComponent>>();
                for (JsonElement ce : jsonObject.get("components").getAsJsonArray()) {
                    String componentName = ce.getAsJsonObject().get("ServiceComponentInfo").getAsJsonObject()
                            .get("component_name").getAsString();
                    List<AmbariHostComponent> hcList = new ArrayList<AmbariHostComponent>();
                    componentsToHostComponentsMap.put(componentName, hcList);
                    JsonArray hcJsonArray = ce.getAsJsonObject().get("host_components").getAsJsonArray();
                    for (JsonElement hce : hcJsonArray) {
                        AmbariHostComponent hc = new AmbariHostComponent();
                        JsonObject hcJsonObject = hce.getAsJsonObject().get("HostRoles").getAsJsonObject();
                        hc.setHostName(hcJsonObject.get("host_name").getAsString());
                        hc.setStarted("STARTED".equals(hcJsonObject.get("state").getAsString()));
                        hc.setName(hcJsonObject.get("component_name").getAsString());
                        hcList.add(hc);
                    }
                }
                svc.setComponentsToHostComponentsMap(componentsToHostComponentsMap);
                return svc;
            } catch (HttpException e) {
                logger.warn("Unable to determine Ambari clusters", e);
                throw createRuntimeException(e);
            } catch (IOException e) {
                logger.warn("Unable to determine Ambari clusters", e);
                throw new RuntimeException(e.getMessage(), e);
            }
        }
        return null;
    }

}