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457 lines
19 KiB
457 lines
19 KiB
//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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//last major change: 21.04.2005 by Martin Thelian
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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.SocketException;
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import java.net.URL;
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import java.util.Date;
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import java.util.logging.FileHandler;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import de.anomic.http.httpHeader;
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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.serverCore;
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import de.anomic.server.serverDate;
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import de.anomic.server.logging.serverLog;
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import de.anomic.server.logging.serverMiniLogFormatter;
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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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private static final String threadBaseName = "CrawlerWorker";
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private final CrawlerPool myPool;
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private final plasmaHTCache cacheManager;
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private final int socketTimeout;
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private final boolean remoteProxyUse;
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private final String remoteProxyHost;
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private final int remoteProxyPort;
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private final serverLog log;
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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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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 doAccessLogging = 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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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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plasmaHTCache cacheManager,
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int socketTimeout,
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boolean remoteProxyUse,
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String remoteProxyHost,
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int remoteProxyPort,
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serverLog log) {
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super(theTG,threadBaseName + "_inPool");
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this.myPool = thePool;
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this.cacheManager = cacheManager;
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this.socketTimeout = socketTimeout;
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this.remoteProxyUse = remoteProxyUse;
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this.remoteProxyHost = remoteProxyHost;
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this.remoteProxyPort = remoteProxyPort;
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this.log = log;
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}
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public synchronized void execute(plasmaCrawlLoaderMessage theMsg) {
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this.theMsg = theMsg;
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this.url = theMsg.url;
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this.name = theMsg.name;
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this.referer = theMsg.referer;
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this.initiator = theMsg.initiator;
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this.depth = theMsg.depth;
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this.profile = theMsg.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.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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// The thread keeps running.
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while (!this.stopped && !Thread.interrupted()) {
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if (this.done) {
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// We are waiting for a task now.
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synchronized (this) {
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try {
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this.wait(); //Wait until we get a request to process.
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}
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catch (InterruptedException e) {
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this.stopped = true;
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// log.error("", e);
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}
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}
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}
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else
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{
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//There is a task....let us execute it.
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try {
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execute();
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} catch (Exception e) {
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// log.error("", e);
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}
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finally {
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reset();
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if (!this.stopped && !this.isInterrupted()) {
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try {
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this.myPool.returnObject(this);
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this.setName(this.threadBaseName + "_inPool");
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}
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catch (Exception e1) {
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e1.printStackTrace();
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}
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}
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}
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}
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}
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}
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public void execute() throws IOException {
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try {
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this.setName(this.threadBaseName + "_" + this.url);
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load(this.url, this.name, this.referer, this.initiator, this.depth, this.profile,
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this.socketTimeout, this.remoteProxyHost, this.remoteProxyPort, this.remoteProxyUse,
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this.cacheManager, this.log);
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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 stopped) {
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this.stopped = stopped;
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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 void 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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String remoteProxyHost,
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int remoteProxyPort,
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boolean remoteProxyUse,
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plasmaHTCache cacheManager,
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serverLog log
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) throws IOException {
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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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remoteProxyHost,
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remoteProxyPort,
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remoteProxyUse,
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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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);
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}
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private static void 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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String remoteProxyHost,
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int remoteProxyPort,
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boolean remoteProxyUse,
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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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) throws IOException {
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if (url == null) return;
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if (crawlingRetryCount < 0) return;
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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.getPath();
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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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// 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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try {
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// create a request header
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httpHeader requestHeader = new httpHeader();
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requestHeader.put("User-Agent", httpdProxyHandler.userAgent);
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requestHeader.put("Referer", referer);
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if (useContentEncodingGzip) requestHeader.put("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 = (remoteProxyUse) ? httpc.getInstance(host, port, socketTimeout, ssl, remoteProxyHost, remoteProxyPort)
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: httpc.getInstance(host, port, socketTimeout, ssl);
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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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long contentLength = res.responseHeader.contentLength();
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// reserve cache entry
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plasmaHTCache.Entry htCache = cacheManager.newEntry(requestDate, depth, url, name, requestHeader, res.status, res.responseHeader, initiator, profile);
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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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String error = null;
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if ((!(plasmaParser.supportedMimeTypesContains(res.responseHeader.mime()))) &&
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(!(plasmaParser.supportedFileExt(url)))) {
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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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} else {
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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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}
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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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} 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.logError("CRAWLER LOADER ERROR1: with URL=" + url.toString() + ": " + e.toString());
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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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// generating the new url
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URL redirectionUrl = new URL(url, (String) res.responseHeader.get(httpHeader.LOCATION));
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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("Redirection detected ('" + res.status + "') for URL " + url.toString() +
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"\nRedirecting request to: " + redirectionUrl);
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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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remoteProxyHost,
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remoteProxyPort,
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remoteProxyUse,
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cacheManager,
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log,
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--crawlingRetryCount,
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useContentEncodingGzip
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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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} catch (Exception e) {
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boolean retryCrawling = false;
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String errorMsg = e.getMessage();
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if (errorMsg != null) {
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if (e instanceof java.net.BindException) {
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log.logWarning("CRAWLER BindException detected while trying to download content from '" + url.toString() +
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"'. Retrying request.");
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retryCrawling = true;
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} else if (errorMsg.indexOf("Corrupt GZIP trailer") >= 0) {
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log.logWarning("CRAWLER Problems detected while receiving gzip encoded content from '" + url.toString() +
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"'. Retrying request without using gzip content encoding.");
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retryCrawling = true;
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} else if (errorMsg.indexOf("Socket time-out: Read timed out") >= 0) {
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log.logWarning("CRAWLER Read timeout while receiving content from '" + url.toString() +
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"'. Retrying request.");
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retryCrawling = true;
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} else if (errorMsg.indexOf("Connection timed out") >= 0) {
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log.logWarning("CRAWLER Connection timeout while receiving content from '" + url.toString() +
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"'. Retrying request.");
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retryCrawling = true;
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} else if (errorMsg.indexOf("Connection refused") >= 0) {
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log.logError("CRAWLER LOADER ERROR2 with URL=" + url.toString() + ": Connection refused");
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}
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if (retryCrawling) {
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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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remoteProxyHost,
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remoteProxyPort,
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remoteProxyUse,
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cacheManager,
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log,
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0,
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false
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);
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} else {
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log.logError("CRAWLER LOADER ERROR2 with URL=" + url.toString() + ": " + e.toString(),e);
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}
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} else {
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// this may happen if the targeted host does not exist or anything with the
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// remote server was wrong.
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log.logError("CRAWLER LOADER ERROR2 with URL=" + url.toString() + ": " + e.toString(),e);
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}
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} finally {
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if (remote != null) httpc.returnInstance(remote);
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}
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}
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}
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