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28d5703f8a
- patch in BLOBHeap to prevent OOM during startup git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4987 6c8d7289-2bf4-0310-a012-ef5d649a1542
574 lines
24 KiB
Java
574 lines
24 KiB
Java
//plasmaCrawlRobotsTxt.java
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//-------------------------------------
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//part of YACY
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//(C) by Michael Peter Christen; mc@anomic.de
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2004
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//
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//This file is contributed by Martin Thelian
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// [MC] moved some methods from robotsParser file that had been created by Alexander Schier to this class
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//last major change: $LastChangedDate$ by $LastChangedBy$
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//Revision: $LastChangedRevision$
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//
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//This program is free software; you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or
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//(at your option) any later version.
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//
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//This program is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//
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//You should have received a copy of the GNU General Public License
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//along with this program; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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//Using this software in any meaning (reading, learning, copying, compiling,
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//running) means that you agree that the Author(s) is (are) not responsible
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//for cost, loss of data or any harm that may be caused directly or indirectly
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//by usage of this softare or this documentation. The usage of this software
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//is on your own risk. The installation and usage (starting/running) of this
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//software may allow other people or application to access your computer and
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//any attached devices and is highly dependent on the configuration of the
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//software which must be done by the user of the software; the author(s) is
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//(are) also not responsible for proper configuration and usage of the
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//software, even if provoked by documentation provided together with
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//the software.
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//
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//Any changes to this file according to the GPL as documented in the file
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//gpl.txt aside this file in the shipment you received can be done to the
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//lines that follows this copyright notice here, but changes must not be
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//done inside the copyright notive above. A re-distribution must contain
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//the intact and unchanged copyright notice.
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//Contributions and changes to the program code must be marked as such.
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package de.anomic.crawler;
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import java.io.BufferedInputStream;
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import java.io.BufferedOutputStream;
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import java.io.File;
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import java.io.IOException;
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import java.net.MalformedURLException;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.LinkedList;
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import de.anomic.http.HttpClient;
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import de.anomic.http.JakartaCommonsHttpClient;
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import de.anomic.http.JakartaCommonsHttpResponse;
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import de.anomic.http.httpHeader;
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import de.anomic.kelondro.kelondroBLOB;
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import de.anomic.kelondro.kelondroBLOBHeap;
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import de.anomic.kelondro.kelondroBLOBTree;
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import de.anomic.kelondro.kelondroException;
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import de.anomic.kelondro.kelondroMap;
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import de.anomic.kelondro.kelondroNaturalOrder;
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import de.anomic.server.serverByteBuffer;
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import de.anomic.server.serverFileUtils;
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import de.anomic.server.logging.serverLog;
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import de.anomic.yacy.yacyURL;
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public class RobotsTxt {
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public static final String ROBOTS_DB_PATH_SEPARATOR = ";";
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kelondroMap robotsTable;
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private final File robotsTableFile;
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//private static final HashSet<String> loadedRobots = new HashSet<String>(); // only for debugging
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public RobotsTxt(File robotsTableFile) {
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this.robotsTableFile = robotsTableFile;
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robotsTableFile.getParentFile().mkdirs();
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kelondroBLOB blob = null;
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if (robotsTableFile.getName().endsWith(".heap")) {
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try {
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blob = new kelondroBLOBHeap(robotsTableFile, 64, kelondroNaturalOrder.naturalOrder);
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} catch (IOException e) {
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e.printStackTrace();
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}
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} else {
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blob = new kelondroBLOBTree(robotsTableFile, true, true, 256, 512, '_', kelondroNaturalOrder.naturalOrder, false, false, true);
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}
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robotsTable = new kelondroMap(blob, 100);
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}
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private void resetDatabase() {
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// deletes the robots.txt database and creates a new one
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if (robotsTable != null) robotsTable.close();
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if (!(robotsTableFile.delete())) throw new RuntimeException("cannot delete robots.txt database");
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robotsTableFile.getParentFile().mkdirs();
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robotsTable = new kelondroMap(new kelondroBLOBTree(robotsTableFile, true, true, 256, 512, '_', kelondroNaturalOrder.naturalOrder, false, false, true), 100);
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}
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public void clear() throws IOException {
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this.robotsTable.clear();
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}
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public void close() {
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this.robotsTable.close();
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}
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public int size() {
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return this.robotsTable.size();
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}
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@SuppressWarnings("unchecked")
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private Entry getEntry(String urlHostPort, boolean fetchOnlineIfNotAvailableOrNotFresh) {
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// this method will always return a non-null value
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Entry robotsTxt4Host = null;
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try {
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HashMap<String, String> record = this.robotsTable.get(urlHostPort);
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if (record != null) robotsTxt4Host = new Entry(urlHostPort, record);
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} catch (kelondroException e) {
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resetDatabase();
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} catch (IOException e) {
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resetDatabase();
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}
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if (fetchOnlineIfNotAvailableOrNotFresh && (
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robotsTxt4Host == null ||
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robotsTxt4Host.getLoadedDate() == null ||
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System.currentTimeMillis() - robotsTxt4Host.getLoadedDate().getTime() > 7*24*60*60*1000
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)) synchronized(this) {
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// if we have not found any data or the data is older than 7 days, we need to load it from the remote server
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// check the robots table again for all threads that come here because they waited for another one
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// to complete a download
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try {
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HashMap<String, String> record = this.robotsTable.get(urlHostPort);
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if (record != null) robotsTxt4Host = new Entry(urlHostPort, record);
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} catch (kelondroException e) {
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resetDatabase();
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} catch (IOException e) {
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resetDatabase();
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}
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if (robotsTxt4Host != null &&
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robotsTxt4Host.getLoadedDate() != null &&
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System.currentTimeMillis() - robotsTxt4Host.getLoadedDate().getTime() <= 7*24*60*60*1000) {
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return robotsTxt4Host;
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}
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// generating the proper url to download the robots txt
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yacyURL robotsURL = null;
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try {
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robotsURL = new yacyURL("http://" + urlHostPort + "/robots.txt", null);
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} catch (MalformedURLException e) {
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serverLog.logSevere("ROBOTS","Unable to generate robots.txt URL for host:port '" + urlHostPort + "'.");
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robotsURL = null;
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}
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Object[] result = null;
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if (robotsURL != null) {
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serverLog.logFine("ROBOTS","Trying to download the robots.txt file from URL '" + robotsURL + "'.");
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try {
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result = downloadRobotsTxt(robotsURL, 5, robotsTxt4Host);
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} catch (Exception e) {
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result = null;
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}
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}
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/*
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assert !loadedRobots.contains(robotsURL.toNormalform(false, false)) :
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"robots-url=" + robotsURL.toString() +
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", robots=" + ((result == null || result[DOWNLOAD_ROBOTS_TXT] == null) ? "NULL" : new String((byte[]) result[DOWNLOAD_ROBOTS_TXT])) +
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", robotsTxt4Host=" + ((robotsTxt4Host == null) ? "NULL" : robotsTxt4Host.getLoadedDate().toString());
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loadedRobots.add(robotsURL.toNormalform(false, false));
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*/
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if (result == null) {
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// no robots.txt available, make an entry to prevent that the robots loading is done twice
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if (robotsTxt4Host == null) {
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// generate artificial entry
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robotsTxt4Host = new Entry(
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urlHostPort,
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new ArrayList<String>(),
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new Date(),
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new Date(),
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null,
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null,
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new Integer(0));
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} else {
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robotsTxt4Host.setLoadedDate(new Date());
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}
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// store the data into the robots DB
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addEntry(robotsTxt4Host);
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} else {
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Object[] parserResult = robotsParser.parse((byte[]) result[DOWNLOAD_ROBOTS_TXT]);
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ArrayList<String> denyPath = (ArrayList<String>) parserResult[0];
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if (((Boolean) result[DOWNLOAD_ACCESS_RESTRICTED]).booleanValue()) {
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denyPath = new ArrayList<String>();
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denyPath.add("/");
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}
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// store the data into the robots DB
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robotsTxt4Host = addEntry(
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urlHostPort,
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denyPath,
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new Date(),
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(Date) result[DOWNLOAD_MODDATE],
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(String) result[DOWNLOAD_ETAG],
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(String) parserResult[1],
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(Integer) parserResult[2]);
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}
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}
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return robotsTxt4Host;
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}
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public int crawlDelay(yacyURL theURL) {
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String urlHostPort = getHostPort(theURL);
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RobotsTxt.Entry robotsEntry = getEntry(urlHostPort, true);
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return robotsEntry.getCrawlDelay();
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}
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private Entry addEntry(
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String hostName,
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ArrayList<String> disallowPathList,
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Date loadedDate,
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Date modDate,
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String eTag,
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String sitemap,
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Integer crawlDelay
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) {
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Entry entry = new Entry(
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hostName, disallowPathList, loadedDate, modDate,
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eTag, sitemap, crawlDelay);
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addEntry(entry);
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return entry;
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}
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private String addEntry(Entry entry) {
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// writes a new page and returns key
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try {
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this.robotsTable.put(entry.hostName, entry.mem);
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return entry.hostName;
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} catch (IOException e) {
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return null;
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}
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}
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public class Entry {
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public static final String DISALLOW_PATH_LIST = "disallow";
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public static final String LOADED_DATE = "date";
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public static final String MOD_DATE = "modDate";
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public static final String ETAG = "etag";
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public static final String SITEMAP = "sitemap";
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public static final String CRAWL_DELAY = "crawlDelay";
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// this is a simple record structure that hold all properties of a single crawl start
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HashMap<String, String> mem;
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private LinkedList<String> disallowPathList;
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String hostName;
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public Entry(String hostName, HashMap<String, String> mem) {
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this.hostName = hostName.toLowerCase();
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this.mem = mem;
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if (this.mem.containsKey(DISALLOW_PATH_LIST)) {
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this.disallowPathList = new LinkedList<String>();
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String csPl = this.mem.get(DISALLOW_PATH_LIST);
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if (csPl.length() > 0){
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String[] pathArray = csPl.split(ROBOTS_DB_PATH_SEPARATOR);
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if ((pathArray != null)&&(pathArray.length > 0)) {
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this.disallowPathList.addAll(Arrays.asList(pathArray));
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}
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}
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} else {
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this.disallowPathList = new LinkedList<String>();
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}
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}
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public Entry(
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String hostName,
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ArrayList<String> disallowPathList,
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Date loadedDate,
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Date modDate,
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String eTag,
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String sitemap,
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Integer crawlDelay
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) {
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if ((hostName == null) || (hostName.length() == 0)) throw new IllegalArgumentException("The hostname is missing");
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this.hostName = hostName.trim().toLowerCase();
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this.disallowPathList = new LinkedList<String>();
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this.mem = new HashMap<String, String>(5);
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if (loadedDate != null) this.mem.put(LOADED_DATE,Long.toString(loadedDate.getTime()));
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if (modDate != null) this.mem.put(MOD_DATE,Long.toString(modDate.getTime()));
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if (eTag != null) this.mem.put(ETAG,eTag);
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if (sitemap != null) this.mem.put(SITEMAP,sitemap);
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if (crawlDelay != null) this.mem.put(CRAWL_DELAY,crawlDelay.toString());
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if ((disallowPathList != null)&&(disallowPathList.size()>0)) {
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this.disallowPathList.addAll(disallowPathList);
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StringBuffer pathListStr = new StringBuffer();
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for (int i=0; i<disallowPathList.size();i++) {
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pathListStr.append(disallowPathList.get(i))
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.append(ROBOTS_DB_PATH_SEPARATOR);
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}
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this.mem.put(DISALLOW_PATH_LIST,pathListStr.substring(0,pathListStr.length()-1));
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}
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}
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public String toString() {
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StringBuffer str = new StringBuffer();
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str.append((this.hostName==null)?"null":this.hostName)
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.append(": ");
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if (this.mem != null) {
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str.append(this.mem.toString());
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}
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return str.toString();
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}
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public String getSitemap() {
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return this.mem.containsKey(SITEMAP)? (String)this.mem.get(SITEMAP): null;
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}
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public Date getLoadedDate() {
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if (this.mem.containsKey(LOADED_DATE)) {
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return new Date(Long.valueOf(this.mem.get(LOADED_DATE)).longValue());
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}
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return null;
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}
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public void setLoadedDate(Date newLoadedDate) {
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if (newLoadedDate != null) {
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this.mem.put(LOADED_DATE,Long.toString(newLoadedDate.getTime()));
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}
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}
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public Date getModDate() {
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if (this.mem.containsKey(MOD_DATE)) {
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return new Date(Long.valueOf(this.mem.get(MOD_DATE)).longValue());
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}
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return null;
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}
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public String getETag() {
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if (this.mem.containsKey(ETAG)) {
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return this.mem.get(ETAG);
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}
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return null;
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}
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public int getCrawlDelay() {
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if (this.mem.containsKey(CRAWL_DELAY)) try {
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return Integer.parseInt(this.mem.get(CRAWL_DELAY));
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} catch (NumberFormatException e) {
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return 0;
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}
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return 0;
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}
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public boolean isDisallowed(String path) {
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if ((this.mem == null) || (this.disallowPathList.size() == 0)) return false;
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// if the path is null or empty we set it to /
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if ((path == null) || (path.length() == 0)) path = "/";
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// escaping all occurences of ; because this char is used as special char in the Robots DB
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else path = path.replaceAll(ROBOTS_DB_PATH_SEPARATOR,"%3B");
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Iterator<String> pathIter = this.disallowPathList.iterator();
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while (pathIter.hasNext()) {
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String nextPath = pathIter.next();
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// allow rule
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if (nextPath.startsWith("!") && nextPath.length() > 1 && path.startsWith(nextPath.substring(1))) {
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return false;
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}
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// disallow rule
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if (path.startsWith(nextPath)) {
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return true;
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}
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}
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return false;
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}
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}
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// methods that had been in robotsParser.java:
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public static final int DOWNLOAD_ACCESS_RESTRICTED = 0;
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public static final int DOWNLOAD_ROBOTS_TXT = 1;
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public static final int DOWNLOAD_ETAG = 2;
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public static final int DOWNLOAD_MODDATE = 3;
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private static final String getHostPort(yacyURL theURL) {
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String urlHostPort = null;
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int port = getPort(theURL);
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urlHostPort = theURL.getHost() + ":" + port;
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urlHostPort = urlHostPort.toLowerCase().intern();
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return urlHostPort;
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}
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private static final int getPort(yacyURL theURL) {
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int port = theURL.getPort();
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if (port == -1) {
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if (theURL.getProtocol().equalsIgnoreCase("http")) {
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port = 80;
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} else if (theURL.getProtocol().equalsIgnoreCase("https")) {
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port = 443;
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}
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}
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return port;
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}
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public yacyURL getSitemapURL(yacyURL theURL) {
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if (theURL == null) throw new IllegalArgumentException();
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yacyURL sitemapURL = null;
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// generating the hostname:poart string needed to do a DB lookup
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String urlHostPort = getHostPort(theURL);
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RobotsTxt.Entry robotsTxt4Host = this.getEntry(urlHostPort, true);
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try {
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String sitemapUrlStr = robotsTxt4Host.getSitemap();
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if (sitemapUrlStr != null) sitemapURL = new yacyURL(sitemapUrlStr, null);
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} catch (MalformedURLException e) {/* ignore this */}
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return sitemapURL;
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}
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public Integer getCrawlDelay(yacyURL theURL) {
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if (theURL == null) throw new IllegalArgumentException();
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Integer crawlDelay = null;
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// generating the hostname:poart string needed to do a DB lookup
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String urlHostPort = getHostPort(theURL);
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RobotsTxt.Entry robotsTxt4Host = getEntry(urlHostPort, true);
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try {
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crawlDelay = robotsTxt4Host.getCrawlDelay();
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} catch (NumberFormatException e) {/* ignore this */}
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return crawlDelay;
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}
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public boolean isDisallowed(yacyURL nexturl) {
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if (nexturl == null) throw new IllegalArgumentException();
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// generating the hostname:port string needed to do a DB lookup
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String urlHostPort = getHostPort(nexturl);
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RobotsTxt.Entry robotsTxt4Host = null;
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robotsTxt4Host = getEntry(urlHostPort, true);
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return robotsTxt4Host.isDisallowed(nexturl.getFile());
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}
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private static Object[] downloadRobotsTxt(yacyURL robotsURL, int redirectionCount, RobotsTxt.Entry entry) throws Exception {
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if (redirectionCount < 0) return new Object[]{Boolean.FALSE,null,null};
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redirectionCount--;
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boolean accessCompletelyRestricted = false;
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byte[] robotsTxt = null;
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long downloadStart, downloadEnd;
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String eTag=null, oldEtag = null;
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Date lastMod=null;
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downloadStart = System.currentTimeMillis();
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// if we previously have downloaded this robots.txt then we can set the if-modified-since header
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httpHeader reqHeaders = new httpHeader();
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// add yacybot user agent
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reqHeaders.put(httpHeader.USER_AGENT, HTTPLoader.crawlerUserAgent);
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// adding referer
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|
reqHeaders.put(httpHeader.REFERER, (yacyURL.newURL(robotsURL,"/")).toNormalform(true, true));
|
|
|
|
if (entry != null) {
|
|
oldEtag = entry.getETag();
|
|
reqHeaders = new httpHeader();
|
|
Date modDate = entry.getModDate();
|
|
if (modDate != null) reqHeaders.put(httpHeader.IF_MODIFIED_SINCE,HttpClient.dateString(entry.getModDate()));
|
|
|
|
}
|
|
|
|
// setup http-client
|
|
//TODO: adding Traffic statistic for robots download?
|
|
JakartaCommonsHttpClient client = new JakartaCommonsHttpClient(10000, reqHeaders, null);
|
|
JakartaCommonsHttpResponse res = null;
|
|
try {
|
|
// sending the get request
|
|
res = client.GET(robotsURL.toString());
|
|
|
|
// check for interruption
|
|
if (Thread.currentThread().isInterrupted()) throw new InterruptedException("Shutdown in progress.");
|
|
|
|
// check the response status
|
|
if (res.getStatusLine().startsWith("2")) {
|
|
if (!res.getResponseHeader().mime().startsWith("text/plain")) {
|
|
robotsTxt = null;
|
|
serverLog.logFinest("ROBOTS","Robots.txt from URL '" + robotsURL + "' has wrong mimetype '" + res.getResponseHeader().mime() + "'.");
|
|
} else {
|
|
|
|
// getting some metadata
|
|
eTag = res.getResponseHeader().containsKey(httpHeader.ETAG)?(res.getResponseHeader().get(httpHeader.ETAG)).trim():null;
|
|
lastMod = res.getResponseHeader().lastModified();
|
|
|
|
// if the robots.txt file was not changed we break here
|
|
if ((eTag != null) && (oldEtag != null) && (eTag.equals(oldEtag))) {
|
|
serverLog.logFinest("ROBOTS","Robots.txt from URL '" + robotsURL + "' was not modified. Abort downloading of new version.");
|
|
return null;
|
|
}
|
|
|
|
// downloading the content
|
|
serverByteBuffer sbb = new serverByteBuffer();
|
|
try {
|
|
serverFileUtils.copyToStream(new BufferedInputStream(res.getDataAsStream()), new BufferedOutputStream(sbb));
|
|
} finally {
|
|
res.closeStream();
|
|
}
|
|
robotsTxt = sbb.getBytes();
|
|
|
|
downloadEnd = System.currentTimeMillis();
|
|
serverLog.logFinest("ROBOTS","Robots.txt successfully loaded from URL '" + robotsURL + "' in " + (downloadEnd-downloadStart) + " ms.");
|
|
}
|
|
} else if (res.getStatusCode() == 304) {
|
|
return null;
|
|
} else if (res.getStatusLine().startsWith("3")) {
|
|
// getting redirection URL
|
|
String redirectionUrlString = res.getResponseHeader().get(httpHeader.LOCATION);
|
|
if (redirectionUrlString==null) {
|
|
serverLog.logFinest("ROBOTS","robots.txt could not be downloaded from URL '" + robotsURL + "' because of missing redirecton header. [" + res.getStatusLine() + "].");
|
|
robotsTxt = null;
|
|
} else {
|
|
|
|
redirectionUrlString = redirectionUrlString.trim();
|
|
|
|
// generating the new URL object
|
|
yacyURL redirectionUrl = yacyURL.newURL(robotsURL, redirectionUrlString);
|
|
|
|
// following the redirection
|
|
serverLog.logFinest("ROBOTS","Redirection detected for robots.txt with URL '" + robotsURL + "'." +
|
|
"\nRedirecting request to: " + redirectionUrl);
|
|
return downloadRobotsTxt(redirectionUrl,redirectionCount,entry);
|
|
}
|
|
} else if (res.getStatusCode() == 401 || res.getStatusCode() == 403) {
|
|
accessCompletelyRestricted = true;
|
|
serverLog.logFinest("ROBOTS","Access to Robots.txt not allowed on URL '" + robotsURL + "'.");
|
|
} else {
|
|
serverLog.logFinest("ROBOTS","robots.txt could not be downloaded from URL '" + robotsURL + "'. [" + res.getStatusLine() + "].");
|
|
robotsTxt = null;
|
|
}
|
|
} catch (Exception e) {
|
|
throw e;
|
|
} finally {
|
|
if(res != null) {
|
|
// release connection
|
|
res.closeStream();
|
|
}
|
|
}
|
|
return new Object[]{new Boolean(accessCompletelyRestricted),robotsTxt,eTag,lastMod};
|
|
}
|
|
}
|