/*
 * 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.util.io.PathUtils;
import alluxio.worker.WorkerProcess;
import alluxio.worker.block.BlockWorker;

import com.google.common.base.Preconditions;
import org.eclipse.jetty.servlet.ServletHolder;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.servlet.ServletContainer;

import java.net.InetSocketAddress;

import javax.annotation.concurrent.NotThreadSafe;
import javax.servlet.ServletException;

/**
 * The Alluxio worker web server.
 */
@NotThreadSafe
public final class WorkerWebServer extends WebServer {

  public static final String ALLUXIO_WORKER_SERVLET_RESOURCE_KEY = "Alluxio Worker";

  /**
   * Creates a new instance of {@link WorkerWebServer}.
   *
   * @param webAddress the service address
   * @param workerProcess the Alluxio worker process
   * @param blockWorker block worker to manage blocks
   * @param connectHost the connect host for the web server
   * @param startTimeMs start time milliseconds
   */
  public WorkerWebServer(InetSocketAddress webAddress, final WorkerProcess workerProcess,
      BlockWorker blockWorker, String connectHost, long startTimeMs) {
    super("Alluxio worker web service", webAddress);
    Preconditions.checkNotNull(blockWorker, "Block worker cannot be null");

    InetSocketAddress workerAddress = new InetSocketAddress(connectHost, getLocalPort());

    mWebAppContext.addServlet(new ServletHolder(new WebInterfaceWorkerGeneralServlet(
        blockWorker, workerAddress, startTimeMs)), "/home");
    mWebAppContext.addServlet(new ServletHolder(new WebInterfaceWorkerBlockInfoServlet(
        blockWorker)), "/blockInfo");
    mWebAppContext.addServlet(new ServletHolder(new WebInterfaceDownloadLocalServlet()),
        "/downloadLocal");
    mWebAppContext.addServlet(new ServletHolder(new WebInterfaceBrowseLogsServlet(false)),
        "/browseLogs");
    mWebAppContext.addServlet(new ServletHolder(new WebInterfaceHeaderServlet()), "/header");
    mWebAppContext
        .addServlet(new ServletHolder(new WebInterfaceWorkerMetricsServlet()), "/metricsui");

    // REST configuration
    ResourceConfig config = new ResourceConfig().packages("alluxio.worker", "alluxio.worker.block");
    // Override the init method to inject a reference to AlluxioWorker 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 = -7586014404855912954L;

      @Override
      public void init() throws ServletException {
        super.init();
        getServletContext().setAttribute(ALLUXIO_WORKER_SERVLET_RESOURCE_KEY, workerProcess);
      }
    };

    ServletHolder servletHolder = new ServletHolder("Alluxio Worker Web Service", servlet);
    mWebAppContext.addServlet(servletHolder, PathUtils.concatPath(Constants.REST_API_PREFIX, "*"));
  }
}