content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.web;
  
  import alluxio.Constants;
  import alluxio.client.file.FileSystem;
  import alluxio.conf.Configuration;
  import alluxio.conf.PropertyKey;
  import alluxio.master.AlluxioMasterProcess;
  import alluxio.util.io.PathUtils;
  
  import com.google.common.base.Preconditions;
  import org.eclipse.jetty.servlet.DefaultServlet;
  import org.eclipse.jetty.servlet.ErrorPageErrorHandler;
  import org.eclipse.jetty.servlet.ServletHolder;
  import org.eclipse.jetty.util.resource.Resource;
  import org.glassfish.jersey.server.ResourceConfig;
  import org.glassfish.jersey.servlet.ServletContainer;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.File;
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import javax.annotation.concurrent.NotThreadSafe;
  import javax.servlet.ServletException;
  
  /**
   * The Alluxio master web server.
   */
  @NotThreadSafe
  public final class MasterWebServer extends WebServer {
    private static final Logger LOG = LoggerFactory.getLogger(MasterWebServer.class);
  
    public static final String ALLUXIO_MASTER_SERVLET_RESOURCE_KEY = "Alluxio Master";
    public static final String ALLUXIO_FILESYSTEM_CLIENT_RESOURCE_KEY =
        "Alluxio Master FileSystem client";
  
    private final FileSystem mFileSystem;
  
    /**
     * Creates a new instance of {@link MasterWebServer}.
     *
     * @param serviceName the service name
     * @param address the service address
     * @param masterProcess the Alluxio master process
     */
    public MasterWebServer(String serviceName, InetSocketAddress address,
        final AlluxioMasterProcess masterProcess) {
      super(serviceName, address);
      Preconditions.checkNotNull(masterProcess, "Alluxio master cannot be null");
      // REST configuration
      ResourceConfig config = new ResourceConfig()
          .packages("alluxio.master", "alluxio.master.block", "alluxio.master.file")
          .register(JacksonProtobufObjectMapperProvider.class);
      mFileSystem = FileSystem.Factory.create();
      // Override the init method to inject a reference to AlluxioMaster into the servlet context.
      // ServletContext may not be modified until after super.init() is called.
      ServletContainer servlet = new ServletContainer(config) {
        private static final long serialVersionUID = 7756010860672831556L;
  
        @Override
        public void init() throws ServletException {
          super.init();
          getServletContext().setAttribute(ALLUXIO_MASTER_SERVLET_RESOURCE_KEY, masterProcess);
          getServletContext().setAttribute(ALLUXIO_FILESYSTEM_CLIENT_RESOURCE_KEY, mFileSystem);
        }
      };
  
      ServletHolder servletHolder = new ServletHolder("Alluxio Master Web Service", servlet);
      mServletContextHandler
          .addServlet(servletHolder, PathUtils.concatPath(Constants.REST_API_PREFIX, "*"));
  
      // STATIC assets
      try {
        // If the Web UI is disabled, disable the resources and servlet together.
        if (Configuration.getBoolean(PropertyKey.WEB_UI_ENABLED)) {
          String resourceDirPathString =
                  Configuration.getString(PropertyKey.WEB_RESOURCES) + "/master/build/";
          File resourceDir = new File(resourceDirPathString);
          mServletContextHandler.setBaseResource(Resource.newResource(resourceDir.getAbsolutePath()));
          mServletContextHandler.setWelcomeFiles(new String[]{"index.html"});
          mServletContextHandler.setResourceBase(resourceDir.getAbsolutePath());
          mServletContextHandler.addServlet(DefaultServlet.class, "/");
          ErrorPageErrorHandler errorHandler = new ErrorPageErrorHandler();
          // TODO(william): consider a rewrite rule instead of an error handler
          errorHandler.addErrorPage(404, "/");
          mServletContextHandler.setErrorHandler(errorHandler);
        }
      } catch (IOException e) {
        LOG.error("ERROR: resource path is malformed", e);
      }
    }
  
    @Override
    public void stop() throws Exception {
      mFileSystem.close();
      super.stop();
    }
  }
  