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392 lines
19 KiB
392 lines
19 KiB
// plasmaCrawlStacker.java
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// -----------------------
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// part of YaCy
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// (C) by Michael Peter Christen; mc@yacy.net
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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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package de.anomic.crawler;
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import java.net.UnknownHostException;
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import java.util.Date;
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import net.yacy.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.data.meta.URIMetadataRow;
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import net.yacy.kelondro.logging.Log;
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import net.yacy.kelondro.order.Base64Order;
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import net.yacy.kelondro.util.Domains;
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import net.yacy.kelondro.workflow.WorkflowProcessor;
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import net.yacy.repository.Blacklist;
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import de.anomic.crawler.retrieval.Request;
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import de.anomic.search.Segment;
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import de.anomic.search.Switchboard;
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import de.anomic.yacy.yacySeedDB;
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public final class CrawlStacker {
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private final Log log = new Log("STACKCRAWL");
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private final WorkflowProcessor<Request> fastQueue, slowQueue;
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//private long dnsHit;
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private long dnsMiss;
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private final CrawlQueues nextQueue;
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private final CrawlSwitchboard crawler;
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private final Segment indexSegment;
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private final yacySeedDB peers;
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private final boolean acceptLocalURLs, acceptGlobalURLs;
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// this is the process that checks url for double-occurrences and for allowance/disallowance by robots.txt
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public CrawlStacker(
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CrawlQueues cq,
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CrawlSwitchboard cs,
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Segment indexSegment,
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yacySeedDB peers,
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boolean acceptLocalURLs,
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boolean acceptGlobalURLs) {
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this.nextQueue = cq;
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this.crawler = cs;
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this.indexSegment = indexSegment;
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this.peers = peers;
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//this.dnsHit = 0;
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this.dnsMiss = 0;
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this.acceptLocalURLs = acceptLocalURLs;
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this.acceptGlobalURLs = acceptGlobalURLs;
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this.fastQueue = new WorkflowProcessor<Request>("CrawlStackerFast", "This process checks new urls before they are enqueued into the balancer (proper, double-check, correct domain, filter)", new String[]{"Balancer"}, this, "job", 10000, null, 2);
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this.slowQueue = new WorkflowProcessor<Request>("CrawlStackerSlow", "This is like CrawlStackerFast, but does additionaly a DNS lookup. The CrawlStackerFast does not need this because it can use the DNS cache.", new String[]{"Balancer"}, this, "job", 1000, null, 5);
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this.log.logInfo("STACKCRAWL thread initialized.");
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}
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public int size() {
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return this.fastQueue.queueSize() + this.slowQueue.queueSize();
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}
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public boolean isEmpty() {
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if (!this.fastQueue.queueIsEmpty()) return false;
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if (!this.slowQueue.queueIsEmpty()) return false;
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return true;
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}
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public void clear() {
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this.fastQueue.clear();
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this.slowQueue.clear();
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}
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public void announceClose() {
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this.log.logInfo("Flushing remaining " + size() + " crawl stacker job entries.");
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this.fastQueue.announceShutdown();
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this.slowQueue.announceShutdown();
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}
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public void close() {
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this.log.logInfo("Shutdown. waiting for remaining " + size() + " crawl stacker job entries. please wait.");
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this.fastQueue.announceShutdown();
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this.slowQueue.announceShutdown();
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this.fastQueue.awaitShutdown(2000);
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this.slowQueue.awaitShutdown(2000);
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this.log.logInfo("Shutdown. Closing stackCrawl queue.");
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clear();
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}
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private boolean prefetchHost(final 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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if (Domains.dnsResolveFromCache(host) != null) return true; // found entry
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} catch (final UnknownHostException e) {
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// we know that this is unknown
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return false;
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}
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// we just don't know anything about that host
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return false;
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}
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/*
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public boolean job() {
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if (this.fastQueue.queueSize() > 0 && job(this.fastQueue)) return true;
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if (this.slowQueue.queueSize() == 0) return false;
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return job(this.slowQueue);
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}
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*/
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public Request job(Request entry) {
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// this is the method that is called by the busy thread from outside
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if (entry == null) return null;
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try {
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final String rejectReason = 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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nextQueue.errorURL.push(entry, peers.mySeed().hash.getBytes(), new Date(), 1, rejectReason);
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}
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} catch (final Exception e) {
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CrawlStacker.this.log.logWarning("Error while processing stackCrawl entry.\n" + "Entry: " + entry.toString() + "Error: " + e.toString(), e);
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return null;
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}
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return null;
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}
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public void enqueueEntry(final Request entry) {
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// DEBUG
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if (log.isFinest()) log.logFinest("ENQUEUE " + entry.url() + ", referer=" + entry.referrerhash() + ", initiator=" + new String(entry.initiator()) + ", name=" + entry.name() + ", appdate=" + entry.appdate() + ", depth=" + entry.depth());
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if (prefetchHost(entry.url().getHost())) {
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try {
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this.fastQueue.enQueue(entry);
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//this.dnsHit++;
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} catch (InterruptedException e) {
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Log.logException(e);
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}
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} else {
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try {
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this.slowQueue.enQueue(entry);
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this.dnsMiss++;
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} catch (InterruptedException e) {
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Log.logException(e);
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}
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}
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}
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public String stackCrawl(final Request 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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final CrawlProfile.entry profile = crawler.profilesActiveCrawls.getEntry(entry.profileHandle());
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String error;
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if (profile == null) {
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error = "LOST STACKER PROFILE HANDLE '" + entry.profileHandle() + "' for URL " + entry.url();
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log.logWarning(error);
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return error;
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}
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error = checkAcceptance(entry.url(), profile, entry.depth());
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if (error != null) return error;
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final DigestURI referrerURL = (entry.referrerhash() == null || entry.referrerhash().length == 0) ? null : nextQueue.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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// store information
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final boolean local = Base64Order.enhancedCoder.equal(entry.initiator(), peers.mySeed().hash.getBytes());
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final boolean proxy = (entry.initiator() == null || entry.initiator().length == 0 || new String(entry.initiator()).equals("------------")) && profile.handle().equals(crawler.defaultProxyProfile.handle());
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final boolean remote = profile.handle().equals(crawler.defaultRemoteProfile.handle());
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final boolean global =
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(profile.remoteIndexing()) /* granted */ &&
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(entry.depth() == profile.depth()) /* leaf node */ &&
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//(initiatorHash.equals(yacyCore.seedDB.mySeed.hash)) /* not proxy */ &&
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(
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(peers.mySeed().isSenior()) ||
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(peers.mySeed().isPrincipal())
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) /* qualified */;
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if (!local && !global && !remote && !proxy) {
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error = "URL '" + entry.url().toString() + "' cannot be crawled. initiator = " + new String(entry.initiator()) + ", profile.handle = " + profile.handle();
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this.log.logSevere(error);
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return error;
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}
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if (global) {
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// it may be possible that global == true and local == true, so do not check an error case against it
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if (proxy) this.log.logWarning("URL '" + entry.url().toString() + "' has conflicting initiator properties: global = true, proxy = true, initiator = " + new String(entry.initiator()) + ", profile.handle = " + profile.handle());
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if (remote) this.log.logWarning("URL '" + entry.url().toString() + "' has conflicting initiator properties: global = true, remote = true, initiator = " + new String(entry.initiator()) + ", profile.handle = " + profile.handle());
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//int b = nextQueue.noticeURL.stackSize(NoticedURL.STACK_TYPE_LIMIT);
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nextQueue.noticeURL.push(NoticedURL.STACK_TYPE_LIMIT, entry);
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//assert b < nextQueue.noticeURL.stackSize(NoticedURL.STACK_TYPE_LIMIT);
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//this.log.logInfo("stacked/global: " + entry.url().toString() + ", stacksize = " + nextQueue.noticeURL.stackSize(NoticedURL.STACK_TYPE_LIMIT));
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} else if (local) {
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if (proxy) this.log.logWarning("URL '" + entry.url().toString() + "' has conflicting initiator properties: local = true, proxy = true, initiator = " + new String(entry.initiator()) + ", profile.handle = " + profile.handle());
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if (remote) this.log.logWarning("URL '" + entry.url().toString() + "' has conflicting initiator properties: local = true, remote = true, initiator = " + new String(entry.initiator()) + ", profile.handle = " + profile.handle());
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//int b = nextQueue.noticeURL.stackSize(NoticedURL.STACK_TYPE_CORE);
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nextQueue.noticeURL.push(NoticedURL.STACK_TYPE_CORE, entry);
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//assert b < nextQueue.noticeURL.stackSize(NoticedURL.STACK_TYPE_CORE);
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//this.log.logInfo("stacked/local: " + entry.url().toString() + ", stacksize = " + nextQueue.noticeURL.stackSize(NoticedURL.STACK_TYPE_CORE));
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} else if (proxy) {
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if (remote) this.log.logWarning("URL '" + entry.url().toString() + "' has conflicting initiator properties: proxy = true, remote = true, initiator = " + new String(entry.initiator()) + ", profile.handle = " + profile.handle());
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//int b = nextQueue.noticeURL.stackSize(NoticedURL.STACK_TYPE_CORE);
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nextQueue.noticeURL.push(NoticedURL.STACK_TYPE_CORE, entry);
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//assert b < nextQueue.noticeURL.stackSize(NoticedURL.STACK_TYPE_CORE);
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//this.log.logInfo("stacked/proxy: " + entry.url().toString() + ", stacksize = " + nextQueue.noticeURL.stackSize(NoticedURL.STACK_TYPE_CORE));
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} else if (remote) {
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//int b = nextQueue.noticeURL.stackSize(NoticedURL.STACK_TYPE_REMOTE);
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nextQueue.noticeURL.push(NoticedURL.STACK_TYPE_REMOTE, entry);
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//assert b < nextQueue.noticeURL.stackSize(NoticedURL.STACK_TYPE_REMOTE);
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//this.log.logInfo("stacked/remote: " + entry.url().toString() + ", stacksize = " + nextQueue.noticeURL.stackSize(NoticedURL.STACK_TYPE_REMOTE));
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}
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return null;
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}
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public String checkAcceptance(final DigestURI url, final CrawlProfile.entry profile, int depth) {
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// check if the protocol is supported
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final String urlProtocol = url.getProtocol();
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if (!Switchboard.getSwitchboard().loader.isSupportedProtocol(urlProtocol)) {
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this.log.logSevere("Unsupported protocol in URL '" + url.toString() + "'.");
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return "unsupported protocol";
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}
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// check if ip is local ip address
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final String urlRejectReason = urlInAcceptedDomain(url);
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if (urlRejectReason != null) {
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if (this.log.isFine()) this.log.logFine("denied_(" + urlRejectReason + ")");
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return "denied_(" + urlRejectReason + ")";
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}
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// check blacklist
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if (Switchboard.urlBlacklist.isListed(Blacklist.BLACKLIST_CRAWLER, url)) {
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if (this.log.isFine()) this.log.logFine("URL '" + url.toString() + "' is in blacklist.");
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return "url in blacklist";
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}
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// filter with must-match
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if ((depth > 0) && !profile.mustMatchPattern().matcher(url.toString()).matches()) {
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if (this.log.isFine()) this.log.logFine("URL '" + url.toString() + "' does not match must-match crawling filter '" + profile.mustMatchPattern().toString() + "'.");
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return "url does not match must-match filter";
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}
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// filter with must-not-match
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if ((depth > 0) && profile.mustNotMatchPattern().matcher(url.toString()).matches()) {
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if (this.log.isFine()) this.log.logFine("URL '" + url.toString() + "' does matches do-not-match crawling filter '" + profile.mustNotMatchPattern().toString() + "'.");
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return "url matches must-not-match filter";
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}
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// deny cgi
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if (url.isIndividual()) {
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if (this.log.isFine()) this.log.logFine("URL '" + url.toString() + "' is CGI URL.");
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return "cgi url not allowed";
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}
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// deny post properties
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if (url.isPOST() && !(profile.crawlingQ())) {
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if (this.log.isFine()) this.log.logFine("URL '" + url.toString() + "' is post URL.");
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return "post url not allowed";
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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(url.getHost()))) {
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if (this.log.isFine()) this.log.logFine("URL '" + url.toString() + "' is not listed in granted domains.");
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return "url does not match domain filter";
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}
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// deny urls that exceed allowed number of occurrences
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if (!(profile.grantedDomCount(url.getHost()))) {
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if (this.log.isFine()) this.log.logFine("URL '" + url.toString() + "' appeared too often, a maximum of " + profile.domMaxPages() + " is allowed.");
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return "domain counter exceeded";
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}
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// check if the url is double registered
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final String dbocc = nextQueue.urlExists(url.hash()); // returns the name of the queue if entry exists
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URIMetadataRow oldEntry = indexSegment.urlMetadata().load(url.hash(), null, 0);
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if (oldEntry == null) {
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if (dbocc != null) {
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// do double-check
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if (this.log.isFine()) this.log.logFine("URL '" + url.toString() + "' is double registered in '" + dbocc + "'.");
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if (dbocc.equals("errors")) {
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ZURL.Entry errorEntry = nextQueue.errorURL.get(url.hash());
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return "double in: errors (" + errorEntry.anycause() + ")";
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} else {
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return "double in: " + dbocc;
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}
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}
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} else {
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final boolean recrawl = profile.recrawlIfOlder() > oldEntry.loaddate().getTime();
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if (recrawl) {
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if (this.log.isFine())
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this.log.logFine("RE-CRAWL of URL '" + url.toString() + "': this url was crawled " +
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((System.currentTimeMillis() - oldEntry.loaddate().getTime()) / 60000 / 60 / 24) + " days ago.");
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} else {
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if (dbocc == null) {
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return "double in: LURL-DB";
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} else {
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if (this.log.isFine()) this.log.logFine("URL '" + url.toString() + "' is double registered in '" + dbocc + "'. " + "Stack processing time:");
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if (dbocc.equals("errors")) {
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ZURL.Entry errorEntry = nextQueue.errorURL.get(url.hash());
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return "double in: errors (" + errorEntry.anycause() + ")";
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} else {
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return "double in: " + dbocc;
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}
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}
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}
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}
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return null;
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}
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/**
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* Test a url if it can be used for crawling/indexing
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* This mainly checks if the url is in the declared domain (local/global)
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* @param url
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* @return null if the url can be accepted, a string containing a rejection reason if the url cannot be accepted
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*/
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public String urlInAcceptedDomain(final DigestURI url) {
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// returns true if the url can be accepted accoring to network.unit.domain
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if (url == null) return "url is null";
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final String host = url.getHost();
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if (this.acceptLocalURLs && host == null && url.getProtocol().equals("file")) return null;
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if (host == null) return "url.host is null";
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if (this.acceptGlobalURLs && this.acceptLocalURLs) return null; // fast shortcut to avoid dnsResolve
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// check if this is a local address and we are allowed to index local pages:
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//boolean local = hostAddress.isSiteLocalAddress() || hostAddress.isLoopbackAddress();
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final boolean local = url.isLocal();
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//assert local == yacyURL.isLocalDomain(url.hash()); // TODO: remove the dnsResolve above!
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if ((this.acceptGlobalURLs && !local) || (this.acceptLocalURLs && local)) return null;
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return (local) ?
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("the host '" + host + "' is local, but local addresses are not accepted") :
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("the host '" + host + "' is global, but global addresses are not accepted");
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}
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public String urlInAcceptedDomainHash(final byte[] urlhash) {
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// returns true if the url can be accepted accoring to network.unit.domain
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if (urlhash == null) return "url is null";
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if (this.acceptGlobalURLs && this.acceptLocalURLs) return null; // fast shortcut to avoid dnsResolve
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// check if this is a local address and we are allowed to index local pages:
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//boolean local = hostAddress.isSiteLocalAddress() || hostAddress.isLoopbackAddress();
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final boolean local = DigestURI.isLocal(urlhash);
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//assert local == yacyURL.isLocalDomain(url.hash()); // TODO: remove the dnsResolve above!
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if ((this.acceptGlobalURLs && !local) || (this.acceptLocalURLs && local)) return null;
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return (local) ?
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("the urlhash '" + new String(urlhash) + "' is local, but local addresses are not accepted") :
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("the urlhash '" + new String(urlhash) + "' is global, but global addresses are not accepted");
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}
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public boolean acceptLocalURLs() {
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return this.acceptLocalURLs;
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}
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public boolean acceptGlobalURLs() {
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return this.acceptGlobalURLs;
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}
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}
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