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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.atlas.web.service;
  
  import org.apache.atlas.AtlasConfiguration;
  import org.apache.atlas.AtlasErrorCode;
  import org.apache.atlas.RequestContext;
  import org.apache.atlas.exception.AtlasBaseException;
  import org.apache.atlas.model.audit.AtlasAuditEntry;
  import org.apache.atlas.repository.audit.AtlasAuditService;
  import org.apache.atlas.util.BeanUtil;
  import org.eclipse.jetty.server.Connector;
  import org.eclipse.jetty.server.HttpConfiguration;
  import org.eclipse.jetty.server.HttpConnectionFactory;
  import org.eclipse.jetty.server.Server;
  import org.eclipse.jetty.server.ServerConnector;
  import org.eclipse.jetty.util.thread.ExecutorThreadPool;
  import org.eclipse.jetty.webapp.WebAppContext;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.Date;
  import java.util.concurrent.LinkedBlockingQueue;
  import java.util.concurrent.ThreadPoolExecutor;
  import java.util.concurrent.TimeUnit;
  
  /**
   * This class embeds a Jetty server and a connector.
   */
  public class EmbeddedServer {
      public static final Logger LOG = LoggerFactory.getLogger(EmbeddedServer.class);
  
      public static final String ATLAS_DEFAULT_BIND_ADDRESS = "0.0.0.0";
      public static final Date   SERVER_START_TIME          = new Date();
  
      protected final Server server;
  
      private AtlasAuditService auditService;
      private ServiceState      serviceState;
  
      public EmbeddedServer(String host, int port, String path) throws IOException {
          int                           queueSize     = AtlasConfiguration.WEBSERVER_QUEUE_SIZE.getInt();
          LinkedBlockingQueue<Runnable> queue         = new LinkedBlockingQueue<>(queueSize);
          int                           minThreads    = AtlasConfiguration.WEBSERVER_MIN_THREADS.getInt();
          int                           maxThreads    = AtlasConfiguration.WEBSERVER_MAX_THREADS.getInt();
          long                          keepAliveTime = AtlasConfiguration.WEBSERVER_KEEPALIVE_SECONDS.getLong();
          ThreadPoolExecutor            executor      = new ThreadPoolExecutor(maxThreads, maxThreads, keepAliveTime, TimeUnit.SECONDS, queue);
          ExecutorThreadPool            pool          = new ExecutorThreadPool(executor, minThreads);
  
          server = new Server(pool);
  
          Connector connector = getConnector(host, port);
  
          server.addConnector(connector);
  
          WebAppContext application = getWebAppContext(path);
  
          server.setHandler(application);
      }
  
      public static EmbeddedServer newServer(String host, int port, String path, boolean secure) throws IOException {
          if (secure) {
              return new SecureEmbeddedServer(host, port, path);
          } else {
              return new EmbeddedServer(host, port, path);
          }
      }
  
      public void start() throws AtlasBaseException {
          try {
              server.start();
  
              auditServerStatus();
  
              server.join();
          } catch (Exception e) {
              throw new AtlasBaseException(AtlasErrorCode.EMBEDDED_SERVER_START, e);
          }
      }
  
      public void stop() {
          try {
              server.stop();
          } catch (Exception e) {
              LOG.warn("Error during shutdown", e);
          }
      }
  
      protected WebAppContext getWebAppContext(String path) {
          WebAppContext application = new WebAppContext(path, "/");
  
          application.setClassLoader(Thread.currentThread().getContextClassLoader());
          // Disable directory listing
          application.setInitParameter("org.eclipse.jetty.servlet.Default.dirAllowed", "false");
  
          return application;
      }
  
      protected Connector getConnector(String host, int port) throws IOException {
          HttpConfiguration httpConfig = new HttpConfiguration();
  
          // this is to enable large header sizes when Kerberos is enabled with AD
          final int bufferSize = AtlasConfiguration.WEBSERVER_REQUEST_BUFFER_SIZE.getInt();
  
          httpConfig.setResponseHeaderSize(bufferSize);
          httpConfig.setRequestHeaderSize(bufferSize);
          httpConfig.setSendServerVersion(false);
  
          ServerConnector connector = new ServerConnector(server, new HttpConnectionFactory(httpConfig));
  
          connector.setPort(port);
          connector.setHost(host);
  
          return connector;
      }
  
      private void auditServerStatus() {
          auditService = BeanUtil.getBean(AtlasAuditService.class);
          serviceState = BeanUtil.getBean(ServiceState.class);
  
          ServiceState.ServiceStateValue serviceStateValue = serviceState.getState();
  
          if (serviceStateValue == ServiceState.ServiceStateValue.ACTIVE) {
              Date date = new Date();
  
              try {
                  auditService.add(AtlasAuditEntry.AuditOperation.SERVER_START, SERVER_START_TIME, date, null, null, 0);
                  auditService.add(AtlasAuditEntry.AuditOperation.SERVER_STATE_ACTIVE, date, date, null, null, 0);
              } catch (AtlasBaseException e) {
                  LOG.error("Exception occurred during audit", e);
              } finally {
                  // After server related audits are added, the request created and now cleared here.
                  RequestContext.clear();
              }
          }
      }
  }
  