CrawlDBTestUtil.java

/*
 * 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.nutch.crawl;

import java.io.File;
import java.io.IOException;
import java.net.UnknownHostException;
import java.util.Iterator;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.MapFile;
import org.apache.hadoop.io.Text;
import org.mortbay.http.HttpContext;
import org.mortbay.http.SocketListener;
import org.mortbay.http.handler.ResourceHandler;
import org.mortbay.jetty.Server;

public class CrawlDBTestUtil {

  private static final Log LOG = LogFactory.getLog(CrawlDBTestUtil.class);

  /**
   * Creates synthetic crawldb
   * 
   * @param fs
   *          filesystem where db will be created
   * @param crawldb
   *          path were db will be created
   * @param init
   *          urls to be inserted, objects are of type URLCrawlDatum
   * @throws Exception
   */
  public static void createCrawlDb(Configuration conf, FileSystem fs, Path crawldb, List<URLCrawlDatum> init)
      throws Exception {
    LOG.trace("* creating crawldb: " + crawldb);
    Path dir = new Path(crawldb, CrawlDb.CURRENT_NAME);
    MapFile.Writer writer = new MapFile.Writer(conf, fs, new Path(dir, "part-00000")
        .toString(), Text.class, CrawlDatum.class);
    Iterator<URLCrawlDatum> it = init.iterator();
    while (it.hasNext()) {
      URLCrawlDatum row = it.next();
      LOG.info("adding:" + row.url.toString());
      writer.append(new Text(row.url), row.datum);
    }
    writer.close();
  }

  /**
   * For now we need to manually construct our Configuration, because we need to
   * override the default one and it is currently not possible to use dynamically
   * set values.
   * 
   * @return
   * @deprecated Use {@link #createConfiguration()} instead
   */
  public static Configuration create(){
    return createConfiguration();
  }

  /**
   * For now we need to manually construct our Configuration, because we need to
   * override the default one and it is currently not possible to use dynamically
   * set values.
   * 
   * @return
   */
  public static Configuration createConfiguration(){
    Configuration conf = new Configuration();
    conf.addResource("nutch-default.xml");
    conf.addResource("crawl-tests.xml");
    return conf;
  }

  public static class URLCrawlDatum {

    Text url;

    CrawlDatum datum;

    public URLCrawlDatum(Text url, CrawlDatum datum) {
      this.url = url;
      this.datum = datum;
    }
  }
  
  /**
   * Generate seedlist
   * @throws IOException 
   */
  public static void generateSeedList(FileSystem fs, Path urlPath, List<String> contents) throws IOException{
    FSDataOutputStream out;
    Path file=new Path(urlPath,"urls.txt");
    fs.mkdirs(urlPath);
    out=fs.create(file);
    Iterator<String> iterator=contents.iterator();
    while(iterator.hasNext()){
      String url=iterator.next();
      out.writeBytes(url);
      out.writeBytes("\n");
    }
    out.flush();
    out.close();
  }
  
  /**
   * Creates a new JettyServer with one static root context
   * 
   * @param port port to listen to
   * @param staticContent folder where static content lives
   * @throws UnknownHostException 
   */
  public static Server getServer(int port, String staticContent) throws UnknownHostException{
    Server webServer = new org.mortbay.jetty.Server();
    SocketListener listener = new SocketListener();
    listener.setPort(port);
    listener.setHost("127.0.0.1");
    webServer.addListener(listener);
    HttpContext staticContext = new HttpContext();
    staticContext.setContextPath("/");
    staticContext.setResourceBase(staticContent);
    staticContext.addHandler(new ResourceHandler());
    webServer.addContext(staticContext);
    return webServer;
  }
}