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509 lines
23 KiB
509 lines
23 KiB
// plasmaCrawlStacker.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, 2005
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//
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// This file was contributed by Martin Thelian
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// ([MC] removed all multithreading and thread pools, this is not necessary here; complete renovation 2007)
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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.IOException;
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import java.net.UnknownHostException;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.Iterator;
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import java.util.LinkedList;
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import de.anomic.index.indexURLEntry;
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import de.anomic.kelondro.kelondroCache;
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import de.anomic.kelondro.kelondroEcoTable;
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import de.anomic.kelondro.kelondroException;
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import de.anomic.kelondro.kelondroIndex;
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import de.anomic.kelondro.kelondroRow;
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import de.anomic.kelondro.kelondroRowSet;
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import de.anomic.kelondro.kelondroTree;
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import de.anomic.plasma.urlPattern.plasmaURLPattern;
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import de.anomic.server.serverDomains;
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import de.anomic.server.logging.serverLog;
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import de.anomic.yacy.yacyCore;
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import de.anomic.yacy.yacyURL;
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public final class plasmaCrawlStacker extends Thread {
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private static final int EcoFSBufferSize = 20;
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private static String stackfile = "urlNoticeStacker9.db";
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// keys for different database types
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public static final int QUEUE_DB_TYPE_RAM = 0;
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public static final int QUEUE_DB_TYPE_TREE = 1;
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public static final int QUEUE_DB_TYPE_ECO = 2;
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final serverLog log = new serverLog("STACKCRAWL");
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private plasmaSwitchboard sb;
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private final LinkedList<String> urlEntryHashCache;
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private kelondroIndex urlEntryCache;
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private File cacheStacksPath;
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private long preloadTime;
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private int dbtype;
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private boolean prequeue;
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private long dnsHit, dnsMiss;
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private int alternateCount;
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// objects for the prefetch task
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private ArrayList<String> dnsfetchHosts = new ArrayList<String>();
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public plasmaCrawlStacker(plasmaSwitchboard sb, File dbPath, long preloadTime, int dbtype, boolean prequeue) {
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this.sb = sb;
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this.prequeue = prequeue;
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this.dnsHit = 0;
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this.dnsMiss = 0;
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this.alternateCount = 0;
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// init the message list
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this.urlEntryHashCache = new LinkedList<String>();
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// create a stack for newly entered entries
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this.cacheStacksPath = dbPath;
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this.preloadTime = preloadTime;
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this.dbtype = dbtype;
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openDB();
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try {
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// loop through the list and fill the messageList with url hashs
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Iterator<kelondroRow.Entry> rows = this.urlEntryCache.rows(true, null);
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kelondroRow.Entry entry;
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while (rows.hasNext()) {
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entry = (kelondroRow.Entry) rows.next();
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if (entry == null) {
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System.out.println("ERROR! null element found");
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continue;
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}
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this.urlEntryHashCache.add(entry.getColString(0, null));
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}
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} catch (kelondroException e) {
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/* if we have an error, we start with a fresh database */
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plasmaCrawlStacker.this.log.logSevere("Unable to initialize crawl stacker queue, kelondroException:" + e.getMessage() + ". Reseting DB.\n", e);
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// deleting old db and creating a new db
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try {this.urlEntryCache.close();} catch (Exception ex) {}
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deleteDB();
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openDB();
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} catch (IOException e) {
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/* if we have an error, we start with a fresh database */
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plasmaCrawlStacker.this.log.logSevere("Unable to initialize crawl stacker queue, IOException:" + e.getMessage() + ". Reseting DB.\n", e);
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// deleting old db and creating a new db
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try {this.urlEntryCache.close();} catch (Exception ex) {}
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deleteDB();
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openDB();
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}
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this.log.logInfo(size() + " entries in the stackCrawl queue.");
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this.start(); // start the prefetcher thread
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this.log.logInfo("STACKCRAWL thread initialized.");
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}
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public void run() {
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String nextHost;
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try {
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while (!Thread.currentThread().isInterrupted()) { // action loop
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if (dnsfetchHosts.size() == 0) synchronized (this) { wait(); }
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synchronized (dnsfetchHosts) {
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nextHost = (String) dnsfetchHosts.remove(dnsfetchHosts.size() - 1);
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}
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try {
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serverDomains.dnsResolve(nextHost);
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} catch (Exception e) {}
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}
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} catch (InterruptedException e) {}
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}
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public boolean prefetchHost(String host) {
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// returns true when the host was known in the dns cache.
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// If not, the host is stacked on the fetch stack and false is returned
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try {
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serverDomains.dnsResolveFromCache(host);
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return true;
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} catch (UnknownHostException e) {
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synchronized (this) {
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dnsfetchHosts.add(host);
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notifyAll();
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}
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return false;
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}
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}
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public void terminateDNSPrefetcher() {
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synchronized (this) {
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interrupt();
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}
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}
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public void close() {
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if (this.dbtype == QUEUE_DB_TYPE_RAM) {
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this.log.logFine("Shutdown. Flushing remaining " + size() + " crawl stacker job entries. please wait.");
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while (size() > 0) {
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if (!job()) break;
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}
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}
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terminateDNSPrefetcher();
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this.log.logFine("Shutdown. Closing stackCrawl queue.");
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// closing the db
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this.urlEntryCache.close();
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// clearing the hash list
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this.urlEntryHashCache.clear();
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}
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public boolean job() {
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plasmaCrawlEntry entry;
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try {
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entry = dequeueEntry();
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} catch (IOException e) {
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e.printStackTrace();
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return false;
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}
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if (entry == null) return false;
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try {
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String rejectReason = sb.crawlStacker.stackCrawl(entry);
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// if the url was rejected we store it into the error URL db
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if (rejectReason != null) {
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plasmaCrawlZURL.Entry ee = sb.crawlQueues.errorURL.newEntry(entry, yacyCore.seedDB.mySeed().hash, null, 0, rejectReason);
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ee.store();
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sb.crawlQueues.errorURL.push(ee);
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}
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} catch (Exception e) {
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plasmaCrawlStacker.this.log.logWarning("Error while processing stackCrawl entry.\n" + "Entry: " + entry.toString() + "Error: " + e.toString(), e);
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return false;
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}
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return true;
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}
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public void enqueueEntry(
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yacyURL nexturl,
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String referrerhash,
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String initiatorHash,
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String name,
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Date loadDate,
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int currentdepth,
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plasmaCrawlProfile.entry profile) {
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if (profile == null) return;
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plasmaCrawlEntry newEntry = new plasmaCrawlEntry(
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initiatorHash,
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nexturl,
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referrerhash,
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name,
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loadDate,
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profile.handle(),
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currentdepth,
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0,
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0
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);
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if (newEntry == null) return;
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synchronized(this.urlEntryHashCache) {
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kelondroRow.Entry oldValue;
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boolean hostknown = true;
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if (prequeue) hostknown = prefetchHost(nexturl.getHost());
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try {
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oldValue = this.urlEntryCache.put(newEntry.toRow());
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} catch (IOException e) {
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oldValue = null;
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}
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if (oldValue == null) {
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//System.out.println("*** debug crawlStacker dnsHit=" + this.dnsHit + ", dnsMiss=" + this.dnsMiss + ", alternateCount=" + this.alternateCount + ((this.dnsMiss > 0) ? (", Q=" + (this.dnsHit / this.dnsMiss)) : ""));
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if (hostknown) {
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this.alternateCount++;
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this.urlEntryHashCache.addFirst(newEntry.url().hash());
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this.dnsHit++;
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} else {
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if ((this.dnsMiss > 0) && (this.alternateCount > 2 * this.dnsHit / this.dnsMiss)) {
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this.urlEntryHashCache.addFirst(newEntry.url().hash());
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this.alternateCount = 0;
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//System.out.println("*** debug crawlStacker alternate switch, dnsHit=" + this.dnsHit + ", dnsMiss=" + this.dnsMiss + ", alternateCount=" + this.alternateCount + ", Q=" + (this.dnsHit / this.dnsMiss));
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} else {
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this.urlEntryHashCache.addLast(newEntry.url().hash());
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}
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this.dnsMiss++;
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}
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}
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}
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}
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private void deleteDB() {
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if (this.dbtype == QUEUE_DB_TYPE_RAM) {
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// do nothing..
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}
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if (this.dbtype == QUEUE_DB_TYPE_ECO) {
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new File(cacheStacksPath, stackfile).delete();
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//kelondroFlexWidthArray.delete(cacheStacksPath, stackfile);
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}
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if (this.dbtype == QUEUE_DB_TYPE_TREE) {
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File cacheFile = new File(cacheStacksPath, stackfile);
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cacheFile.delete();
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}
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}
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private void openDB() {
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if (!(cacheStacksPath.exists())) cacheStacksPath.mkdir(); // make the path
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if (this.dbtype == QUEUE_DB_TYPE_RAM) {
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this.urlEntryCache = new kelondroRowSet(plasmaCrawlEntry.rowdef, 0);
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}
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if (this.dbtype == QUEUE_DB_TYPE_ECO) {
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cacheStacksPath.mkdirs();
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File f = new File(cacheStacksPath, stackfile);
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try {
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this.urlEntryCache = new kelondroEcoTable(f, plasmaCrawlEntry.rowdef, kelondroEcoTable.tailCacheUsageAuto, EcoFSBufferSize, 0);
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//this.urlEntryCache = new kelondroCache(new kelondroFlexTable(cacheStacksPath, newCacheName, preloadTime, plasmaCrawlEntry.rowdef, 0, true));
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} catch (Exception e) {
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e.printStackTrace();
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// kill DB and try again
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f.delete();
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//kelondroFlexTable.delete(cacheStacksPath, newCacheName);
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try {
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this.urlEntryCache = new kelondroEcoTable(f, plasmaCrawlEntry.rowdef, kelondroEcoTable.tailCacheUsageAuto, EcoFSBufferSize, 0);
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//this.urlEntryCache = new kelondroCache(new kelondroFlexTable(cacheStacksPath, newCacheName, preloadTime, plasmaCrawlEntry.rowdef, 0, true));
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} catch (Exception ee) {
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ee.printStackTrace();
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System.exit(-1);
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}
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}
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}
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if (this.dbtype == QUEUE_DB_TYPE_TREE) {
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File cacheFile = new File(cacheStacksPath, stackfile);
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cacheFile.getParentFile().mkdirs();
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this.urlEntryCache = new kelondroCache(kelondroTree.open(cacheFile, true, preloadTime, plasmaCrawlEntry.rowdef));
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}
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}
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public int size() {
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synchronized (this.urlEntryHashCache) {
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return this.urlEntryHashCache.size();
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}
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}
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public int getDBType() {
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return this.dbtype;
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}
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public plasmaCrawlEntry dequeueEntry() throws IOException {
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if (this.urlEntryHashCache.size() == 0) return null;
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String urlHash = null;
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kelondroRow.Entry entry = null;
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synchronized (this.urlEntryHashCache) {
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urlHash = (String) this.urlEntryHashCache.removeFirst();
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if (urlHash == null) throw new IOException("urlHash is null");
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entry = this.urlEntryCache.remove(urlHash.getBytes(), false);
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}
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if ((urlHash == null) || (entry == null)) return null;
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return new plasmaCrawlEntry(entry);
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}
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public String stackCrawl(yacyURL url, yacyURL referrer, String initiatorHash, String name, Date loadDate, int currentdepth, plasmaCrawlProfile.entry profile) {
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// stacks a crawl item. The position can also be remote
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// returns null if successful, a reason string if not successful
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//this.log.logFinest("stackCrawl: nexturlString='" + nexturlString + "'");
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// add the url into the crawling queue
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plasmaCrawlEntry entry = new plasmaCrawlEntry(
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initiatorHash, // initiator, needed for p2p-feedback
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url, // url clear text string
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(referrer == null) ? null : referrer.hash(), // last url in crawling queue
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name, // load date
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loadDate, // the anchor name
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(profile == null) ? null : profile.handle(), // profile must not be null!
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currentdepth, // depth so far
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0, // anchors, default value
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0 // forkfactor, default value
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);
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return stackCrawl(entry);
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}
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public String stackCrawl(plasmaCrawlEntry entry) {
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// stacks a crawl item. The position can also be remote
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// returns null if successful, a reason string if not successful
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//this.log.logFinest("stackCrawl: nexturlString='" + nexturlString + "'");
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long startTime = System.currentTimeMillis();
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String reason = null; // failure reason
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// check if the protocol is supported
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String urlProtocol = entry.url().getProtocol();
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if (!sb.crawlQueues.isSupportedProtocol(urlProtocol)) {
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reason = plasmaCrawlEURL.DENIED_UNSUPPORTED_PROTOCOL;
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this.log.logSevere("Unsupported protocol in URL '" + entry.url().toString() + "'. " +
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"Stack processing time: " + (System.currentTimeMillis()-startTime) + "ms");
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return reason;
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}
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// check if ip is local ip address
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if (!sb.acceptURL(entry.url())) {
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reason = plasmaCrawlEURL.DENIED_IP_ADDRESS_NOT_IN_DECLARED_DOMAIN + "[" + sb.getConfig("network.unit.domain", "unknown") + "]";
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this.log.logFine("Host in URL '" + entry.url().toString() + "' has IP address outside of declared range (" + sb.getConfig("network.unit.domain", "unknown") + "). " +
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"Stack processing time: " + (System.currentTimeMillis()-startTime) + "ms");
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return reason;
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}
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// check blacklist
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if (plasmaSwitchboard.urlBlacklist.isListed(plasmaURLPattern.BLACKLIST_CRAWLER, entry.url())) {
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reason = plasmaCrawlEURL.DENIED_URL_IN_BLACKLIST;
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this.log.logFine("URL '" + entry.url().toString() + "' is in blacklist. " +
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"Stack processing time: " + (System.currentTimeMillis()-startTime) + "ms");
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return reason;
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}
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plasmaCrawlProfile.entry profile = sb.profilesActiveCrawls.getEntry(entry.profileHandle());
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if (profile == null) {
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String errorMsg = "LOST PROFILE HANDLE '" + entry.profileHandle() + "' for URL " + entry.url();
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log.logWarning(errorMsg);
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return errorMsg;
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}
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// filter deny
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if ((entry.depth() > 0) && (profile != null) && (!(entry.url().toString().matches(profile.generalFilter())))) {
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reason = plasmaCrawlEURL.DENIED_URL_DOES_NOT_MATCH_FILTER;
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this.log.logFine("URL '" + entry.url().toString() + "' does not match crawling filter '" + profile.generalFilter() + "'. " +
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"Stack processing time: " + (System.currentTimeMillis()-startTime) + "ms");
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return reason;
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}
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// deny cgi
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if (entry.url().isCGI()) {
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reason = plasmaCrawlEURL.DENIED_CGI_URL;
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this.log.logFine("URL '" + entry.url().toString() + "' is CGI URL. " +
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"Stack processing time: " + (System.currentTimeMillis()-startTime) + "ms");
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return reason;
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}
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// deny post properties
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if ((entry.url().isPOST()) && (profile != null) && (!(profile.crawlingQ()))) {
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reason = plasmaCrawlEURL.DENIED_POST_URL;
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this.log.logFine("URL '" + entry.url().toString() + "' is post URL. " +
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"Stack processing time: " + (System.currentTimeMillis()-startTime) + "ms");
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return reason;
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}
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yacyURL referrerURL = (entry.referrerhash() == null) ? null : sb.crawlQueues.getURL(entry.referrerhash());
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// add domain to profile domain list
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if ((profile.domFilterDepth() != Integer.MAX_VALUE) || (profile.domMaxPages() != Integer.MAX_VALUE)) {
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profile.domInc(entry.url().getHost(), (referrerURL == null) ? null : referrerURL.getHost().toLowerCase(), entry.depth());
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}
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// deny urls that do not match with the profile domain list
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if (!(profile.grantedDomAppearance(entry.url().getHost()))) {
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reason = plasmaCrawlEURL.DENIED_NO_MATCH_WITH_DOMAIN_FILTER;
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this.log.logFine("URL '" + entry.url().toString() + "' is not listed in granted domains. " +
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"Stack processing time: " + (System.currentTimeMillis()-startTime) + "ms");
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return reason;
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}
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// deny urls that exceed allowed number of occurrences
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if (!(profile.grantedDomCount(entry.url().getHost()))) {
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reason = plasmaCrawlEURL.DENIED_DOMAIN_COUNT_EXCEEDED;
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this.log.logFine("URL '" + entry.url().toString() + "' appeared too often, a maximum of " + profile.domMaxPages() + " is allowed. "+
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"Stack processing time: " + (System.currentTimeMillis()-startTime) + "ms");
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return reason;
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}
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// check if the url is double registered
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String dbocc = sb.crawlQueues.urlExists(entry.url().hash());
|
|
indexURLEntry oldEntry = this.sb.wordIndex.loadedURL.load(entry.url().hash(), null, 0);
|
|
boolean recrawl = (oldEntry != null) && ((System.currentTimeMillis() - oldEntry.loaddate().getTime()) > profile.recrawlIfOlder());
|
|
// do double-check
|
|
if ((dbocc != null) && (!recrawl)) {
|
|
reason = plasmaCrawlEURL.DOUBLE_REGISTERED + dbocc + ")";
|
|
this.log.logFine("URL '" + entry.url().toString() + "' is double registered in '" + dbocc + "'. " + "Stack processing time: " + (System.currentTimeMillis()-startTime) + "ms");
|
|
return reason;
|
|
}
|
|
if ((oldEntry != null) && (!recrawl)) {
|
|
reason = plasmaCrawlEURL.DOUBLE_REGISTERED + "LURL)";
|
|
this.log.logFine("URL '" + entry.url().toString() + "' is double registered in 'LURL'. " + "Stack processing time: " + (System.currentTimeMillis()-startTime) + "ms");
|
|
return reason;
|
|
}
|
|
|
|
// show potential re-crawl
|
|
if (recrawl) {
|
|
this.log.logFine("RE-CRAWL of URL '" + entry.url().toString() + "': this url was crawled " +
|
|
((System.currentTimeMillis() - oldEntry.loaddate().getTime()) / 60000 / 60 / 24) + " days ago.");
|
|
}
|
|
|
|
// store information
|
|
boolean local = ((entry.initiator().equals(yacyURL.dummyHash)) || (entry.initiator().equals(yacyCore.seedDB.mySeed().hash)));
|
|
boolean global =
|
|
(profile != null) &&
|
|
(profile.remoteIndexing()) /* granted */ &&
|
|
(entry.depth() == profile.generalDepth()) /* leaf node */ &&
|
|
//(initiatorHash.equals(yacyCore.seedDB.mySeed.hash)) /* not proxy */ &&
|
|
(
|
|
(yacyCore.seedDB.mySeed().isSenior()) ||
|
|
(yacyCore.seedDB.mySeed().isPrincipal())
|
|
) /* qualified */;
|
|
|
|
if ((!local)&&(!global)&&(!profile.handle().equals(this.sb.defaultRemoteProfile.handle()))) {
|
|
this.log.logSevere("URL '" + entry.url().toString() + "' can neither be crawled local nor global.");
|
|
}
|
|
|
|
// add the url into the crawling queue
|
|
sb.crawlQueues.noticeURL.push(
|
|
((global) ? plasmaCrawlNURL.STACK_TYPE_LIMIT :
|
|
((local) ? plasmaCrawlNURL.STACK_TYPE_CORE : plasmaCrawlNURL.STACK_TYPE_REMOTE)) /*local/remote stack*/,
|
|
entry);
|
|
return null;
|
|
}
|
|
|
|
}
|