content: /*
   * 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.server.checks;
  
  import java.sql.Connection;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.sql.Statement;
  import java.util.Arrays;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  
  import org.apache.ambari.server.audit.AuditLoggerModule;
  import org.apache.ambari.server.controller.ControllerModule;
  import org.apache.ambari.server.ldap.LdapModule;
  import org.apache.ambari.server.orm.DBAccessor;
  import org.apache.commons.cli.CommandLine;
  import org.apache.commons.cli.CommandLineParser;
  import org.apache.commons.cli.DefaultParser;
  import org.apache.commons.cli.Option;
  import org.apache.commons.cli.Options;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.inject.Guice;
  import com.google.inject.Inject;
  import com.google.inject.Injector;
  import com.google.inject.persist.PersistService;
  
  
  /**
   * Mpack Install Checker
   */
  public class MpackInstallChecker {
  
    private static final String MPACK_STACKS_ARG = "mpack-stacks";
  
    private static final Logger LOG = LoggerFactory.getLogger
        (MpackInstallChecker.class);
  
    private PersistService persistService;
    private DBAccessor dbAccessor;
    private Injector injector;
    private Connection connection;
  
    private boolean errorsFound = false;
  
    private static Options getOptions() {
      Options options = new Options();
      options.addOption(Option.builder().longOpt(MPACK_STACKS_ARG).desc(
          "List of stacks defined in the management pack").required().type(String.class).hasArg().valueSeparator(' ').build());
      return options;
    }
  
    private static MpackContext processArguments(String... args) {
      CommandLineParser cmdLineParser = new DefaultParser();
      MpackContext ctx = null;
  
      try {
        CommandLine line = cmdLineParser.parse(getOptions(), args);
        String mpackStacksStr = (String) line.getParsedOptionValue(MPACK_STACKS_ARG);
        HashSet<String> stacksInMpack = new HashSet<>(Arrays.asList(mpackStacksStr.split(",")));
        ctx = new MpackContext(stacksInMpack);
      } catch (Exception exp) {
        System.err.println("Parsing failed. Reason: " + exp.getMessage());
        LOG.error("Parsing failed. Reason: ", exp);
        System.exit(1);
      }
      return ctx;
    }
  
    public boolean isErrorsFound() {
      return errorsFound;
    }
  
    @Inject
    public MpackInstallChecker(DBAccessor dbAccessor,
        Injector injector,
        PersistService persistService) {
      this.dbAccessor = dbAccessor;
      this.injector = injector;
      this.persistService = persistService;
    }
  
    /**
     * Extension of audit logger module
     */
    public static class MpackCheckerAuditModule extends AuditLoggerModule {
  
      public MpackCheckerAuditModule() throws Exception {
      }
  
      @Override
      protected void configure() {
        super.configure();
      }
    }
  
    public void startPersistenceService() {
      persistService.start();
    }
  
    public void stopPersistenceService() {
      persistService.stop();
    }
  
    public Connection getConnection() {
      if (connection == null) {
        if (dbAccessor == null) {
          dbAccessor = injector.getInstance(DBAccessor.class);
        }
        connection = dbAccessor.getConnection();
      }
      return connection;
    }
  
    /**
     * Check if any clusters are deployed with a stack that is not included in the management pack
     * @param stacksInMpack List of stacks included in the management pack
     */
    public void checkClusters(HashSet<String> stacksInMpack) {
  
      ResultSet rs = null;
      Statement statement = null;
      Map<String, Map<String, String>>  clusterStackInfo = new HashMap<>();
      String GET_STACK_NAME_VERSION_QUERY = "select c.cluster_name, s.stack_name, s.stack_version from clusters c " +
          "join stack s on c.desired_stack_id = s.stack_id";
  
      Connection conn = getConnection();
      try {
        statement = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
        rs = statement.executeQuery(GET_STACK_NAME_VERSION_QUERY);
        if (rs != null) {
          while (rs.next()) {
            Map<String, String> stackInfoMap = new HashMap<>();
            stackInfoMap.put(rs.getString("stack_name"), rs.getString("stack_version"));
            clusterStackInfo.put(rs.getString("cluster_name"), stackInfoMap);
          }
        }
  
        for (Map.Entry<String, Map<String, String>> clusterStackInfoEntry : clusterStackInfo.entrySet()) {
          String clusterName = clusterStackInfoEntry.getKey();
          Map<String, String> stackInfo = clusterStackInfoEntry.getValue();
          String stackName = stackInfo.keySet().iterator().next();
          String stackVersion = stackInfo.get(stackName);
          if(!stacksInMpack.contains(stackName)) {
            String errorMsg = String.format("This Ambari instance is already managing the cluster %s that has the " +
                "%s-%s stack installed on it. The management pack you are attempting to install only contains stack " +
                "definitions for %s. Since this management pack does not contain a stack that has already being " +
                "deployed by Ambari, the --purge option would cause your existing Ambari installation to be unusable. " +
                "Due to that we cannot install this management pack.",
                clusterName, stackName, stackVersion, stacksInMpack.toString());
            LOG.error(errorMsg);
            System.err.println(errorMsg);
            errorsFound = true;
          }
        }
      } catch (SQLException e) {
        System.err.println("SQL Exception occured during check for validating installed clusters. Reason: " + e.getMessage());
        LOG.error("SQL Exception occured during check for validating installed clusters. Reason: ", e);
        errorsFound = true;
      } finally {
        if (rs != null) {
          try {
            rs.close();
          } catch (SQLException e) {
            System.err.println("SQL Exception occurred during result set closing procedure. Reason: " +  e.getMessage());
            LOG.error("SQL Exception occurred during result set closing procedure. Reason: " , e);
            errorsFound = true;
          }
        }
        if (statement != null) {
          try {
            statement.close();
          } catch (SQLException e) {
            System.err.println("SQL Exception occurred during statement closing procedure. Reason: " + e.getMessage());
            LOG.error("SQL Exception occurred during statement closing procedure. Reason: ", e);
            errorsFound = true;
          }
        }
      }
    }
  
    /**
     * Main method for management pack installation checker
     */
    public static void main(String[] args) throws Exception {
  
      Injector injector = Guice.createInjector(new ControllerModule(), new MpackCheckerAuditModule(), new LdapModule());
      MpackInstallChecker mpackInstallChecker = injector.getInstance(MpackInstallChecker.class);
      MpackContext mpackContext = processArguments(args);
  
      mpackInstallChecker.startPersistenceService();
  
      mpackInstallChecker.checkClusters(mpackContext.getStacksInMpack());
  
      mpackInstallChecker.stopPersistenceService();
  
      if(mpackInstallChecker.isErrorsFound()) {
        LOG.error("Mpack installation checker failed!");
        System.err.println("Mpack installation checker failed!");
        System.exit(1);
      } else {
        LOG.info("No errors found");
        System.out.println("No errors found");
      }
    }
  
    /**
     * Context object that encapsulates values passed in as arguments to the {@link MpackInstallChecker} class.
     */
    private static class MpackContext {
      private HashSet<String> stacksInMpack;
  
      public MpackContext(HashSet<String> stacksInMpack) {
        this.stacksInMpack = stacksInMpack;
      }
  
      public HashSet<String> getStacksInMpack() {
        return stacksInMpack;
      }
    }
  }
  