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d8d0ac29c3
- each image that is requested is stored in the cache - the image is taken from the cache if exists there - the image can be scaled The purpose of creation a scaled image is because of copyright problems In a further stept the retrieval of not-shrinked images is restricted to either access from localhost or with given authentication This servlet can be used for image-preview purpose after an image search git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@1989 6c8d7289-2bf4-0310-a012-ef5d649a1542
592 lines
26 KiB
Java
592 lines
26 KiB
Java
//plasmaCrawlWorker.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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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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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.plasma;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.net.MalformedURLException;
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import java.net.NoRouteToHostException;
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import java.net.SocketException;
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import java.net.URL;
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import java.net.UnknownHostException;
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import java.util.Date;
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import de.anomic.htmlFilter.htmlFilterContentScraper;
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import de.anomic.http.httpHeader;
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import de.anomic.http.httpRemoteProxyConfig;
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import de.anomic.http.httpc;
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import de.anomic.http.httpdProxyHandler;
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import de.anomic.server.serverSystem;
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import de.anomic.server.logging.serverLog;
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import de.anomic.tools.bitfield;
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import de.anomic.yacy.yacyCore;
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public final class plasmaCrawlWorker extends Thread {
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private static final int DEFAULT_CRAWLING_RETRY_COUNT = 5;
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static final String threadBaseName = "CrawlerWorker";
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private final CrawlerPool myPool;
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private final plasmaSwitchboard sb;
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private final plasmaHTCache cacheManager;
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private final serverLog log;
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private int socketTimeout;
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public plasmaCrawlLoaderMessage theMsg;
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private URL url;
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private String name;
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private String referer;
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private String initiator;
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private int depth;
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private long startdate;
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private plasmaCrawlProfile.entry profile;
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// private String error;
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boolean destroyed = false;
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private boolean running = false;
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private boolean stopped = false;
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private boolean done = false;
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//private static boolean doCrawlerLogging = false;
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/**
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* Do logging configuration for special proxy access log file
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*/
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// static {
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// try {
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// Logger crawlerLogger = Logger.getLogger("CRAWLER.access");
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// crawlerLogger.setUseParentHandlers(false);
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// FileHandler txtLog = new FileHandler("log/crawlerAccess%u%g.log",1024*1024, 20, true);
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// txtLog.setFormatter(new serverMiniLogFormatter());
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// txtLog.setLevel(Level.FINEST);
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// crawlerLogger.addHandler(txtLog);
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//
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// doAccessLogging = true;
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// } catch (Exception e) {
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// System.err.println("PROXY: Unable to configure proxy access logging.");
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// }
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// }
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public plasmaCrawlWorker(
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ThreadGroup theTG,
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CrawlerPool thePool,
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plasmaSwitchboard theSb,
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plasmaHTCache theCacheManager,
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serverLog theLog) {
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super(theTG,threadBaseName + "_created");
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this.myPool = thePool;
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this.sb = theSb;
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this.cacheManager = theCacheManager;
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this.log = theLog;
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// setting the crawler timeout properly
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this.socketTimeout = (int) this.sb.getConfigLong("crawler.clientTimeout", 10000);
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}
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public long getDuration() {
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final long startDate = this.startdate;
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return (startDate != 0) ? System.currentTimeMillis() - startDate : 0;
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}
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public synchronized void execute(plasmaCrawlLoaderMessage theNewMsg) {
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this.theMsg = theNewMsg;
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this.url = theNewMsg.url;
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this.name = theNewMsg.name;
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this.referer = theNewMsg.referer;
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this.initiator = theNewMsg.initiator;
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this.depth = theNewMsg.depth;
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this.profile = theNewMsg.profile;
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this.startdate = System.currentTimeMillis();
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// this.error = null;
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this.done = false;
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if (!this.running) {
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// this.setDaemon(true);
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this.start();
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} else {
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this.notifyAll();
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}
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}
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public void reset() {
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this.theMsg = null;
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this.url = null;
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this.referer = null;
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this.initiator = null;
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this.depth = 0;
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this.startdate = 0;
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this.profile = null;
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// this.error = null;
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}
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public void run() {
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this.running = true;
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try {
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// The thread keeps running.
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while (!this.stopped && !this.isInterrupted() && !this.myPool.isClosed) {
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if (this.done) {
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synchronized (this) {
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// return thread back into pool
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this.myPool.returnObject(this);
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// We are waiting for a new task now.
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if (!this.stopped && !this.destroyed && !this.isInterrupted()) {
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this.wait();
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}
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}
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} else {
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try {
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// executing the new task
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execute();
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} finally {
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reset();
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}
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}
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}
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} catch (InterruptedException ex) {
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serverLog.logFiner("CRAWLER-POOL","Interruption of thread '" + this.getName() + "' detected.");
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} finally {
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if (this.myPool != null && !this.destroyed)
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this.myPool.invalidateObject(this);
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}
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}
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public void execute() {
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try {
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// setting threadname
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this.setName(plasmaCrawlWorker.threadBaseName + "_" + this.url);
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// refreshing timeout value
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this.socketTimeout = (int) this.sb.getConfigLong("crawler.clientTimeout", 10000);
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// loading resource
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load(this.url,
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this.name,
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this.referer,
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this.initiator,
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this.depth,
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this.profile,
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this.socketTimeout,
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this.sb.remoteProxyConfig,
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this.cacheManager,
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false,
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this.log
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);
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} catch (IOException e) {
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//throw e;
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}
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finally {
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this.done = true;
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}
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}
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public void setStopped(boolean isStopped) {
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this.stopped = isStopped;
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}
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public boolean isRunning() {
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return this.running;
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}
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public void close() {
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if (this.isAlive()) {
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try {
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// trying to close all still open httpc-Sockets first
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int closedSockets = httpc.closeOpenSockets(this);
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if (closedSockets > 0) {
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this.log.logInfo(closedSockets + " HTTP-client sockets of thread '" + this.getName() + "' closed.");
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}
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} catch (Exception e) {}
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}
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}
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public static plasmaHTCache.Entry load(
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URL url,
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String name,
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String referer,
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String initiator,
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int depth,
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plasmaCrawlProfile.entry profile,
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int socketTimeout,
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httpRemoteProxyConfig theRemoteProxyConfig,
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plasmaHTCache cacheManager,
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boolean acceptAllContent,
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serverLog log
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) throws IOException {
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return load(url,
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name,
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referer,
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initiator,
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depth,
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profile,
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socketTimeout,
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theRemoteProxyConfig,
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cacheManager,
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log,
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DEFAULT_CRAWLING_RETRY_COUNT,
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true,
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acceptAllContent
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);
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}
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private static plasmaHTCache.Entry load(
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URL url,
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String name,
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String referer,
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String initiator,
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int depth,
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plasmaCrawlProfile.entry profile,
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int socketTimeout,
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httpRemoteProxyConfig theRemoteProxyConfig,
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plasmaHTCache cacheManager,
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serverLog log,
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int crawlingRetryCount,
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boolean useContentEncodingGzip,
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boolean acceptAllContent
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) throws IOException {
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if (url == null) return null;
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// if the recrawling limit was exceeded we stop crawling now
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if (crawlingRetryCount <= 0) return null;
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// getting a reference to the plasmaSwitchboard
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plasmaSwitchboard sb = plasmaCrawlLoader.switchboard;
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Date requestDate = new Date(); // remember the time...
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String host = url.getHost();
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String path = url.getFile();
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int port = url.getPort();
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boolean ssl = url.getProtocol().equals("https");
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if (port < 0) port = (ssl) ? 443 : 80;
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// check if url is in blacklist
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String hostlow = host.toLowerCase();
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if (plasmaSwitchboard.urlBlacklist.isListed(hostlow, path)) {
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log.logInfo("CRAWLER Rejecting URL '" + url.toString() + "'. URL is in blacklist.");
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sb.urlPool.errorURL.newEntry(
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url,
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referer,
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initiator,
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yacyCore.seedDB.mySeed.hash,
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name,
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"denied_(url_in_blacklist)",
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new bitfield(plasmaURL.urlFlagLength),
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true
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);
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return null;
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}
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// TODO: resolve yacy and yacyh domains
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//String yAddress = yacyCore.seedDB.resolveYacyAddress(host);
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// set referrer; in some case advertise a little bit:
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referer = (referer == null) ? "" : referer.trim();
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if (referer.length() == 0) referer = "http://www.yacy.net/yacy/";
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// take a file from the net
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httpc remote = null;
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plasmaHTCache.Entry htCache = null;
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try {
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// create a request header
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httpHeader requestHeader = new httpHeader();
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requestHeader.put(httpHeader.USER_AGENT, httpdProxyHandler.crawlerUserAgent);
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requestHeader.put(httpHeader.REFERER, referer);
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requestHeader.put(httpHeader.ACCEPT_LANGUAGE, sb.getConfig("crawler.acceptLanguage","en-us,en;q=0.5"));
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requestHeader.put(httpHeader.ACCEPT_CHARSET, sb.getConfig("crawler.acceptCharset","ISO-8859-1,utf-8;q=0.7,*;q=0.7"));
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if (useContentEncodingGzip) requestHeader.put(httpHeader.ACCEPT_ENCODING, "gzip,deflate");
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// System.out.println("CRAWLER_REQUEST_HEADER=" + requestHeader.toString()); // DEBUG
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// open the connection
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remote = ((theRemoteProxyConfig != null) && (theRemoteProxyConfig.useProxy()))
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? httpc.getInstance(host, port, socketTimeout, ssl, theRemoteProxyConfig,"CRAWLER",null)
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: httpc.getInstance(host, port, socketTimeout, ssl, "CRAWLER",null);
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// specifying if content encoding is allowed
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remote.setAllowContentEncoding(useContentEncodingGzip);
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// send request
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httpc.response res = remote.GET(path, requestHeader);
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if (res.status.startsWith("200") || res.status.startsWith("203")) {
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// the transfer is ok
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// TODO: aborting download if content is to long ...
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//long contentLength = res.responseHeader.contentLength();
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htCache = cacheManager.newEntry(requestDate, depth, url, name, requestHeader, res.status, res.responseHeader, initiator, profile);
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if (htCache.cacheFile.getAbsolutePath().length() > serverSystem.maxPathLength) {
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remote.close();
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log.logInfo("REJECTED URL " + url.toString() + " because path too long '" +
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cacheManager.cachePath.getAbsolutePath() + "'");
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return (htCache = null);
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}
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// reserve cache entry
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if (!htCache.cacheFile.getCanonicalPath().startsWith(cacheManager.cachePath.getCanonicalPath())) {
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// if the response has not the right file type then reject file
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remote.close();
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log.logInfo("REJECTED URL " + url.toString() + " because of an invalid file path ('" +
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htCache.cacheFile.getCanonicalPath() + "' does not start with '" +
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cacheManager.cachePath.getAbsolutePath() + "').");
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return (htCache = null);
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}
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// request has been placed and result has been returned. work off response
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File cacheFile = cacheManager.getCachePath(url);
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try {
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if ((acceptAllContent) || (plasmaParser.supportedContent(plasmaParser.PARSER_MODE_CRAWLER,url,res.responseHeader.mime()))) {
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if (cacheFile.isFile()) {
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cacheManager.deleteFile(url);
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}
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// we write the new cache entry to file system directly
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cacheFile.getParentFile().mkdirs();
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FileOutputStream fos = null;
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try {
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fos = new FileOutputStream(cacheFile);
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res.writeContent(fos); // superfluous write to array
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htCache.cacheArray = null;
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cacheManager.writeFileAnnouncement(cacheFile);
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//htCache.cacheArray = res.writeContent(fos); // writes in cacheArray and cache file
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} finally {
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if (fos!=null)try{fos.close();}catch(Exception e){}
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}
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// enQueue new entry with response header
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if (profile != null) {
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cacheManager.push(htCache);
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}
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} else {
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// if the response has not the right file type then reject file
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remote.close();
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log.logInfo("REJECTED WRONG MIME/EXT TYPE " + res.responseHeader.mime() + " for URL " + url.toString());
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htCache = null;
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}
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} catch (SocketException e) {
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// this may happen if the client suddenly closes its connection
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// maybe the user has stopped loading
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// in that case, we are not responsible and just forget it
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// but we clean the cache also, since it may be only partial
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// and most possible corrupted
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if (cacheFile.exists()) cacheFile.delete();
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log.logSevere("CRAWLER LOADER ERROR1: with URL=" + url.toString() + ": " + e.toString());
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htCache = null;
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}
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} else if (res.status.startsWith("30")) {
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if (crawlingRetryCount > 0) {
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if (res.responseHeader.containsKey(httpHeader.LOCATION)) {
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// getting redirection URL
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String redirectionUrlString = (String) res.responseHeader.get(httpHeader.LOCATION);
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redirectionUrlString = redirectionUrlString.trim();
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if (redirectionUrlString.length() == 0) {
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log.logWarning("CRAWLER Redirection of URL=" + url.toString() + " aborted. Location header is empty.");
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return null;
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}
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// normalizing URL
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redirectionUrlString = htmlFilterContentScraper.urlNormalform(url, redirectionUrlString);
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// generating the new URL object
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URL redirectionUrl = new URL(redirectionUrlString);
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// returning the used httpc
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httpc.returnInstance(remote);
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remote = null;
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// restart crawling with new url
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log.logInfo("CRAWLER Redirection detected ('" + res.status + "') for URL " + url.toString());
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log.logInfo("CRAWLER ..Redirecting request to: " + redirectionUrl);
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// if we are already doing a shutdown we don't need to retry crawling
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if (Thread.currentThread().isInterrupted()) {
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log.logSevere("CRAWLER Retry of URL=" + url.toString() + " aborted because of server shutdown.");
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return null;
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}
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// generating url hash
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String urlhash = plasmaURL.urlHash(redirectionUrl);
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// removing url from loader queue
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plasmaCrawlLoader.switchboard.urlPool.noticeURL.remove(urlhash);
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// retry crawling with new url
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plasmaHTCache.Entry redirectedEntry = load(redirectionUrl,
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name,
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referer,
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initiator,
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depth,
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profile,
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socketTimeout,
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theRemoteProxyConfig,
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cacheManager,
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log,
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--crawlingRetryCount,
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useContentEncodingGzip,
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acceptAllContent
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);
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if (redirectedEntry != null) {
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// TODO: Here we can store the content of the redirection
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// as content of the original URL if some criterias are met
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// See: http://www.yacy-forum.de/viewtopic.php?t=1719
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//
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// plasmaHTCache.Entry newEntry = (plasmaHTCache.Entry) redirectedEntry.clone();
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// newEntry.url = url;
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// TODO: which http header should we store here?
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//
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// // enQueue new entry with response header
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// if (profile != null) {
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// cacheManager.push(newEntry);
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// }
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// htCache = newEntry;
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}
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}
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} else {
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log.logInfo("Redirection counter exceeded for URL " + url.toString() + ". Processing aborted.");
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}
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}else {
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// if the response has not the right response type then reject file
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log.logInfo("REJECTED WRONG STATUS TYPE '" + res.status + "' for URL " + url.toString());
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// not processed any further
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}
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if (remote != null) remote.close();
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return htCache;
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} catch (Exception e) {
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boolean retryCrawling = false;
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String errorMsg = e.getMessage();
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if ((e instanceof IOException) &&
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(errorMsg != null) &&
|
|
(errorMsg.indexOf("socket closed") >= 0) &&
|
|
(Thread.currentThread().isInterrupted())
|
|
) {
|
|
log.logInfo("CRAWLER Interruption detected because of server shutdown.");
|
|
} else if (e instanceof MalformedURLException) {
|
|
log.logWarning("CRAWLER Malformed URL '" + url.toString() + "' detected. ");
|
|
} else if (e instanceof NoRouteToHostException) {
|
|
log.logWarning("CRAWLER No route to host found while trying to crawl URL '" + url.toString() + "'.");
|
|
} else if ((e instanceof UnknownHostException) ||
|
|
((errorMsg != null) && (errorMsg.indexOf("unknown host") >= 0))) {
|
|
log.logWarning("CRAWLER Unknown host in URL '" + url.toString() + "'. " +
|
|
"Referer URL: " + ((referer == null) ?"Unknown":referer));
|
|
} else if (e instanceof java.net.BindException) {
|
|
log.logWarning("CRAWLER BindException detected while trying to download content from '" + url.toString() +
|
|
"'. Retrying request.");
|
|
retryCrawling = true;
|
|
} else if ((errorMsg != null) && (errorMsg.indexOf("Corrupt GZIP trailer") >= 0)) {
|
|
log.logWarning("CRAWLER Problems detected while receiving gzip encoded content from '" + url.toString() +
|
|
"'. Retrying request without using gzip content encoding.");
|
|
retryCrawling = true;
|
|
} else if ((errorMsg != null) && (errorMsg.indexOf("Read timed out") >= 0)) {
|
|
log.logWarning("CRAWLER Read timeout while receiving content from '" + url.toString() +
|
|
"'. Retrying request.");
|
|
retryCrawling = true;
|
|
} else if ((errorMsg != null) && (errorMsg.indexOf("connect timed out") >= 0)) {
|
|
log.logWarning("CRAWLER Timeout while trying to connect to '" + url.toString() +
|
|
"'. Retrying request.");
|
|
retryCrawling = true;
|
|
} else if ((errorMsg != null) && (errorMsg.indexOf("Connection timed out") >= 0)) {
|
|
log.logWarning("CRAWLER Connection timeout while receiving content from '" + url.toString() +
|
|
"'. Retrying request.");
|
|
retryCrawling = true;
|
|
} else if ((errorMsg != null) && (errorMsg.indexOf("Connection refused") >= 0)) {
|
|
log.logWarning("CRAWLER Connection refused while trying to connect to '" + url.toString() + "'.");
|
|
} else if ((errorMsg != null) && (errorMsg.indexOf("There is not enough space on the disk") >= 0)) {
|
|
log.logSevere("CRAWLER Not enough space on the disk detected while crawling '" + url.toString() + "'. " +
|
|
"Pausing crawlers. ");
|
|
plasmaCrawlLoader.switchboard.pauseCrawlJob(plasmaSwitchboard.CRAWLJOB_LOCAL_CRAWL);
|
|
plasmaCrawlLoader.switchboard.pauseCrawlJob(plasmaSwitchboard.CRAWLJOB_REMOTE_TRIGGERED_CRAWL);
|
|
} else if ((errorMsg != null) && (errorMsg.indexOf("Network is unreachable") >=0)) {
|
|
log.logSevere("CRAWLER Network is unreachable while trying to crawl URL '" + url.toString() + "'. ");
|
|
} else if ((errorMsg != null) && (errorMsg.indexOf("No trusted certificate found")>= 0)) {
|
|
log.logSevere("CRAWLER No trusted certificate found for URL '" + url.toString() + "'. ");
|
|
} else {
|
|
log.logSevere("CRAWLER Unexpected Error with URL '" + url.toString() + "': " + e.toString(),e);
|
|
}
|
|
|
|
if (retryCrawling) {
|
|
// if we are already doing a shutdown we don't need to retry crawling
|
|
if (Thread.currentThread().isInterrupted()) {
|
|
log.logSevere("CRAWLER Retry of URL=" + url.toString() + " aborted because of server shutdown.");
|
|
return null;
|
|
}
|
|
|
|
// returning the used httpc
|
|
if (remote != null) httpc.returnInstance(remote);
|
|
remote = null;
|
|
|
|
// setting the retry counter to 1
|
|
if (crawlingRetryCount > 2) crawlingRetryCount = 2;
|
|
|
|
// retry crawling
|
|
return load(url,
|
|
name,
|
|
referer,
|
|
initiator,
|
|
depth,
|
|
profile,
|
|
socketTimeout,
|
|
theRemoteProxyConfig,
|
|
cacheManager,
|
|
log,
|
|
--crawlingRetryCount,
|
|
false,
|
|
false
|
|
);
|
|
}
|
|
return null;
|
|
} finally {
|
|
if (remote != null) httpc.returnInstance(remote);
|
|
}
|
|
}
|
|
|
|
} |