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 backtype.storm.command;
  
  import backtype.storm.utils.ShellUtils;
  import backtype.storm.utils.Utils;
  import com.alibaba.jstorm.client.ConfigExtension;
  import com.alibaba.jstorm.daemon.supervisor.HealthStatus;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.File;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  public class HealthCheck {
      private static final Logger LOG = LoggerFactory.getLogger(HealthCheck.class);
  
      private static final String NO_RESOURCES = "no_resource";
  
      public static HealthStatus check() {
          Map conf = Utils.readStormConfig();
  
          long timeout = ConfigExtension.getStormHealthTimeoutMs(conf);
          // 1. check panic dir
          String panicPath = ConfigExtension.getStormMachineResourcePanicCheckDir(conf);
          if (!isHealthyUnderPath(panicPath, timeout)) {
              return HealthStatus.PANIC;
          }
  
          // 2. check error dir
          String errorPath = ConfigExtension.getStormMachineResourceErrorCheckDir(conf);
          if (!isHealthyUnderPath(errorPath, timeout)) {
              return HealthStatus.ERROR;
          }
  
          // 3. check warn dir
          String warnPath = ConfigExtension.getStormMachineResourceWarningCheckDir(conf);
          if (!isHealthyUnderPath(warnPath, timeout)) {
              return HealthStatus.WARN;
          }
  
          return HealthStatus.INFO;
      }
  
      /**
       * return false if the health check failed when running the scripts under the path
       **/
      private static boolean isHealthyUnderPath(String path, long timeout) {
          if (path == null) {
              return true;
          }
          List<String> commands = generateCommands(path);
          if (commands != null && commands.size() > 0) {
              for (String command : commands) {
                  ScriptProcessLauncher scriptProcessLauncher = new ScriptProcessLauncher(command, timeout);
                  ExitStatus exit = scriptProcessLauncher.launch();
                  if (exit.equals(ExitStatus.FAILED)) {
                      return false;
                  }
              }
              return true;
          } else {
              return true;
          }
      }
  
      private static List<String> generateCommands(String filePath) {
          File path = new File(filePath);
          List<String> commands = new ArrayList<>();
          if (path.exists()) {
              File[] files = path.listFiles();
              if (files == null) {
                  return commands;
              }
              for (File file : files) {
                  if (!file.isDirectory() && file.canExecute()) {
                      commands.add(file.getAbsolutePath());
                  }
              }
          }
          LOG.debug("The generated check commands are {}", commands);
          return commands;
      }
  
      static class ScriptProcessLauncher {
          ShellUtils.ShellCommandExecutor executor = null;
  
          String command;
  
          public ScriptProcessLauncher(String command, long timeOut) {
              this.command = command;
              this.executor = new ShellUtils.ShellCommandExecutor(new String[]{command}, null, null, timeOut);
          }
  
          public ExitStatus launch() {
              ExitStatus exitStatus = ExitStatus.SUCCESS;
              try {
                  executor.execute();
              } catch (Exception e) {
                  if (executor.isTimedOut()) {
                      exitStatus = ExitStatus.TIMED_OUT;
                  } else {
                      exitStatus = ExitStatus.EXCEPTION;
                  }
                  LOG.warn(command + " exception, the exit status is: " + exitStatus, e);
              } finally {
                  if (exitStatus == ExitStatus.SUCCESS && hasNoResource(executor.getOutput())) {
                      exitStatus = ExitStatus.FAILED;
                      LOG.info("Script execute output: " + executor.getOutput());
                  }
              }
              return exitStatus;
          }
  
          private boolean hasNoResource(String output) {
              String[] splits = output.split("\n");
              for (String split : splits) {
                  if (split.startsWith(NO_RESOURCES)) {
                      return true;
                  }
              }
              return false;
          }
      }
  
      private enum ExitStatus {
          SUCCESS, TIMED_OUT, EXCEPTION, FAILED
      }
  }
  