ql/src/java/org/apache/hadoop/hive/ql/exec/repl/RangerDumpTask.java

/*
 * 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.hadoop.hive.ql.exec.repl;

import com.google.common.annotations.VisibleForTesting;
import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.utils.SecurityUtils;
import org.apache.hadoop.hive.ql.ErrorMsg;
import org.apache.hadoop.hive.ql.exec.Task;
import org.apache.hadoop.hive.ql.exec.repl.ranger.RangerRestClient;
import org.apache.hadoop.hive.ql.exec.repl.ranger.RangerExportPolicyList;
import org.apache.hadoop.hive.ql.exec.repl.ranger.RangerPolicy;
import org.apache.hadoop.hive.ql.exec.repl.ranger.NoOpRangerRestClient;
import org.apache.hadoop.hive.ql.exec.repl.ranger.RangerRestClientImpl;
import org.apache.hadoop.hive.ql.exec.repl.util.ReplUtils;
import org.apache.hadoop.hive.ql.parse.SemanticException;
import org.apache.hadoop.hive.ql.parse.repl.ReplLogger;
import org.apache.hadoop.hive.ql.parse.repl.dump.Utils;
import org.apache.hadoop.hive.ql.parse.repl.dump.log.RangerDumpLogger;
import org.apache.hadoop.hive.ql.parse.repl.metric.event.Status;
import org.apache.hadoop.hive.ql.plan.api.StageType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.Serializable;
import java.net.URL;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * RangerDumpTask.
 *
 * Exports the Ranger security policies to staging directory.
 **/
public class RangerDumpTask extends Task<RangerDumpWork> implements Serializable {
  private static final long serialVersionUID = 1L;

  private static final Logger LOG = LoggerFactory.getLogger(RangerDumpTask.class);

  private transient RangerRestClient rangerRestClient;

  private transient ReplLogger replLogger;

  public RangerDumpTask() {
    super();
  }

  @VisibleForTesting
  RangerDumpTask(final RangerRestClient rangerRestClient, final HiveConf conf, final RangerDumpWork work) {
    this.conf = conf;
    this.work = work;
    this.rangerRestClient = rangerRestClient;
  }

  @Override
  public String getName() {
    return "RANGER_DUMP";
  }

  @Override
  public int execute() {
    try {
      long exportCount = 0;
      Path filePath = null;
      LOG.info("Exporting Ranger Metadata");
      SecurityUtils.reloginExpiringKeytabUser();
      Map<String, Long> metricMap = new HashMap<>();
      metricMap.put(ReplUtils.MetricName.POLICIES.name(), 0L);
      work.getMetricCollector().reportStageStart(getName(), metricMap);
      replLogger = new RangerDumpLogger(work.getDbName(), work.getCurrentDumpPath().toString());
      replLogger.startLog();
      if (rangerRestClient == null) {
        rangerRestClient = getRangerRestClient();
      }
      URL url = work.getRangerConfigResource();
      if (url == null) {
        throw new SemanticException(ErrorMsg.REPL_INVALID_CONFIG_FOR_SERVICE
          .format("Ranger configuration is not valid "
          + ReplUtils.RANGER_CONFIGURATION_RESOURCE_NAME, ReplUtils.REPL_RANGER_SERVICE));
      }
      conf.addResource(url);
      String rangerHiveServiceName = conf.get(ReplUtils.RANGER_HIVE_SERVICE_NAME);
      String rangerEndpoint = conf.get(ReplUtils.RANGER_REST_URL);
      if (StringUtils.isEmpty(rangerEndpoint)) {
        throw new SemanticException(ErrorMsg.REPL_INVALID_CONFIG_FOR_SERVICE
          .format("Ranger endpoint is not valid "
            + rangerEndpoint, ReplUtils.REPL_RANGER_SERVICE));
      }
      if (!rangerRestClient.checkConnection(rangerEndpoint, conf)) {
        throw new SemanticException(ErrorMsg.REPL_EXTERNAL_SERVICE_CONNECTION_ERROR.format(ReplUtils
            .REPL_RANGER_SERVICE,
          "Ranger endpoint is not reachable " + rangerEndpoint));
      }
      RangerExportPolicyList rangerExportPolicyList = rangerRestClient.exportRangerPolicies(rangerEndpoint,
              work.getDbName(), rangerHiveServiceName, conf);
      List<RangerPolicy> rangerPolicies = rangerExportPolicyList.getPolicies();
      if (rangerPolicies.isEmpty()) {
        LOG.info("Ranger policy export request returned empty list or failed, Please refer Ranger admin logs.");
        rangerExportPolicyList = new RangerExportPolicyList();
      } else {
        rangerPolicies = rangerRestClient.removeMultiResourcePolicies(rangerPolicies);
      }
      if (!CollectionUtils.isEmpty(rangerPolicies)) {
        rangerExportPolicyList.setPolicies(rangerPolicies);
        filePath = rangerRestClient.saveRangerPoliciesToFile(rangerExportPolicyList,
                work.getCurrentDumpPath(), ReplUtils.HIVE_RANGER_POLICIES_FILE_NAME, conf);
        if (filePath != null) {
          LOG.info("Ranger policy export finished successfully");
          exportCount = rangerExportPolicyList.getListSize();
          work.getMetricCollector().reportStageProgress(getName(), ReplUtils.MetricName.POLICIES.name(), exportCount);
        }
      }
      replLogger.endLog(exportCount);
      work.getMetricCollector().reportStageEnd(getName(), Status.SUCCESS);
      LOG.debug("Ranger policy export filePath:" + filePath);
      LOG.info("Number of ranger policies exported {}", exportCount);
      return 0;
    } catch (Exception e) {
      LOG.error("failed", e);
      setException(e);
      int errorCode = ErrorMsg.getErrorMsg(e.getMessage()).getErrorCode();
      try {
        if (errorCode > 40000) {
          //Create non recoverable marker at top level
          Path nonRecoverableMarker = new Path(work.getCurrentDumpPath().getParent(),
            ReplAck.NON_RECOVERABLE_MARKER.toString());
          Utils.writeStackTrace(e, nonRecoverableMarker, conf);
          work.getMetricCollector().reportStageEnd(getName(), Status.FAILED_ADMIN, nonRecoverableMarker.toString());
        } else {
          work.getMetricCollector().reportStageEnd(getName(), Status.FAILED);
        }
      } catch (Exception ex) {
        LOG.error("Failed to collect Metrics ", ex);
      }
      return errorCode;
    }
  }

  private RangerRestClient getRangerRestClient() {
    if (conf.getBoolVar(HiveConf.ConfVars.HIVE_IN_TEST_REPL) || conf.getBoolVar(HiveConf.ConfVars.HIVE_IN_TEST)) {
      return new NoOpRangerRestClient();
    }
    return new RangerRestClientImpl();
  }

  @Override
  public StageType getType() {
    return StageType.RANGER_DUMP;
  }

  @Override
  public boolean canExecuteInParallel() {
    return false;
  }
}