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yacy_search_server/source/de/anomic/crawler/CrawlQueues.java

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// CrawlQueues.java
// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
// first published 29.10.2007 on http://yacy.net
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// LICENSE
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package de.anomic.crawler;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.text.ParseException;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import de.anomic.content.RSSMessage;
import de.anomic.crawler.retrieval.Request;
import de.anomic.crawler.retrieval.Response;
import de.anomic.document.parser.xml.RSSFeed;
import de.anomic.http.client.Client;
import de.anomic.kelondro.table.SplitTable;
import de.anomic.kelondro.util.DateFormatter;
import de.anomic.kelondro.util.FileUtils;
import de.anomic.search.Switchboard;
import de.anomic.search.SwitchboardConstants;
import de.anomic.server.serverProcessorJob;
import de.anomic.yacy.yacyClient;
import de.anomic.yacy.yacySeed;
import de.anomic.yacy.yacyURL;
import de.anomic.yacy.dht.PeerSelection;
import de.anomic.yacy.logging.Log;
public class CrawlQueues {
protected Switchboard sb;
protected Log log;
protected Map<Integer, crawlWorker> workers; // mapping from url hash to Worker thread object
private final ArrayList<String> remoteCrawlProviderHashes;
public NoticedURL noticeURL;
public ZURL errorURL, delegatedURL;
public CrawlQueues(final Switchboard sb, final File plasmaPath) {
this.sb = sb;
this.log = new Log("CRAWLER");
this.workers = new ConcurrentHashMap<Integer, crawlWorker>();
this.remoteCrawlProviderHashes = new ArrayList<String>();
// start crawling management
log.logConfig("Starting Crawling Management");
noticeURL = new NoticedURL(plasmaPath);
//errorURL = new plasmaCrawlZURL(); // fresh error DB each startup; can be hold in RAM and reduces IO;
final File errorDBFile = new File(plasmaPath, "urlError2.db");
if (errorDBFile.exists()) {
// delete the error db to get a fresh each time on startup
// this is useful because there is currently no re-use of the data in this table.
if (errorDBFile.isDirectory()) SplitTable.delete(plasmaPath, "urlError2.db"); else FileUtils.deletedelete(errorDBFile);
}
errorURL = new ZURL(plasmaPath, "urlError3.db", false);
delegatedURL = new ZURL(plasmaPath, "urlDelegated3.db", true);
}
public String urlExists(final String hash) {
// tests if hash occurrs in any database
// if it exists, the name of the database is returned,
// if it not exists, null is returned
if (delegatedURL.exists(hash)) return "delegated";
if (errorURL.exists(hash)) return "errors";
for (final crawlWorker worker: workers.values()) {
if (worker.request.url().hash().equals(hash)) return "worker";
}
if (noticeURL.existsInStack(hash)) return "crawler";
return null;
}
public void urlRemove(final String hash) {
noticeURL.removeByURLHash(hash);
delegatedURL.remove(hash);
errorURL.remove(hash);
}
public yacyURL getURL(final String urlhash) {
assert urlhash != null;
if (urlhash == null || urlhash.length() == 0) return null;
ZURL.Entry ee = delegatedURL.getEntry(urlhash);
if (ee != null) return ee.url();
ee = errorURL.getEntry(urlhash);
if (ee != null) return ee.url();
for (final crawlWorker w: workers.values()) {
if (w.request.url().hash().equals(urlhash)) return w.request.url();
}
final Request ne = noticeURL.get(urlhash);
if (ne != null) return ne.url();
return null;
}
public void cleanup() {
// wait for all workers to finish
int timeout = (int) sb.getConfigLong("crawler.clientTimeout", 10000);
for (final crawlWorker w: workers.values()) {
if (w.age() > timeout) w.interrupt();
}
}
public void clear() {
// wait for all workers to finish
for (final crawlWorker w: workers.values()) {
w.interrupt();
}
// TODO: wait some more time until all threads are finished
workers.clear();
remoteCrawlProviderHashes.clear();
noticeURL.clear();
try {
errorURL.clear();
} catch (final IOException e) {
e.printStackTrace();
}
try {
delegatedURL.clear();
} catch (final IOException e) {
e.printStackTrace();
}
}
public void close() {
// wait for all workers to finish
for (final crawlWorker w: workers.values()) {
w.interrupt();
}
for (final crawlWorker w: workers.values()) {
try {
w.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
noticeURL.close();
errorURL.close();
delegatedURL.close();
}
public Request[] activeWorkerEntries() {
synchronized (workers) {
final Request[] e = new Request[workers.size()];
int i = 0;
for (final crawlWorker w: workers.values()) e[i++] = w.request;
return e;
}
}
public int coreCrawlJobSize() {
return noticeURL.stackSize(NoticedURL.STACK_TYPE_CORE);
}
public boolean coreCrawlJob() {
final boolean robinsonPrivateCase = ((sb.isRobinsonMode()) &&
(!sb.getConfig(SwitchboardConstants.CLUSTER_MODE, "").equals(SwitchboardConstants.CLUSTER_MODE_PUBLIC_CLUSTER)) &&
(!sb.getConfig(SwitchboardConstants.CLUSTER_MODE, "").equals(SwitchboardConstants.CLUSTER_MODE_PRIVATE_CLUSTER)));
if (((robinsonPrivateCase) || (coreCrawlJobSize() <= 20)) && (limitCrawlJobSize() > 0)) {
// move some tasks to the core crawl job so we have something to do
final int toshift = Math.min(10, limitCrawlJobSize()); // this cannot be a big number because the balancer makes a forced waiting if it cannot balance
for (int i = 0; i < toshift; i++) {
noticeURL.shift(NoticedURL.STACK_TYPE_LIMIT, NoticedURL.STACK_TYPE_CORE, sb.crawler.profilesActiveCrawls);
}
log.logInfo("shifted " + toshift + " jobs from global crawl to local crawl (coreCrawlJobSize()=" + coreCrawlJobSize() +
", limitCrawlJobSize()=" + limitCrawlJobSize() + ", cluster.mode=" + sb.getConfig(SwitchboardConstants.CLUSTER_MODE, "") +
", robinsonMode=" + ((sb.isRobinsonMode()) ? "on" : "off"));
}
if(!crawlIsPossible(NoticedURL.STACK_TYPE_CORE, "Core")) return false;
if(isPaused(SwitchboardConstants.CRAWLJOB_LOCAL_CRAWL)) return false;
// do a local crawl
Request urlEntry = null;
while (urlEntry == null && noticeURL.stackSize(NoticedURL.STACK_TYPE_CORE) > 0) {
final String stats = "LOCALCRAWL[" + noticeURL.stackSize(NoticedURL.STACK_TYPE_CORE) + ", " + noticeURL.stackSize(NoticedURL.STACK_TYPE_LIMIT) + ", " + noticeURL.stackSize(NoticedURL.STACK_TYPE_OVERHANG) + ", " + noticeURL.stackSize(NoticedURL.STACK_TYPE_REMOTE) + "]";
try {
urlEntry = noticeURL.pop(NoticedURL.STACK_TYPE_CORE, true, sb.crawler.profilesActiveCrawls);
if (urlEntry == null) continue;
final String profileHandle = urlEntry.profileHandle();
// System.out.println("DEBUG plasmaSwitchboard.processCrawling:
// profileHandle = " + profileHandle + ", urlEntry.url = " + urlEntry.url());
if (profileHandle == null) {
log.logSevere(stats + ": NULL PROFILE HANDLE '" + urlEntry.profileHandle() + "' for URL " + urlEntry.url());
return true;
}
generateCrawl(urlEntry, stats, profileHandle);
return true;
} catch (final IOException e) {
log.logSevere(stats + ": CANNOT FETCH ENTRY: " + e.getMessage(), e);
if (e.getMessage().indexOf("hash is null") > 0) noticeURL.clear(NoticedURL.STACK_TYPE_CORE);
}
}
return true;
}
/**
* Make some checks if crawl is valid and start it
*
* @param urlEntry
* @param profileHandle
* @param stats String for log prefixing
* @return
*/
private void generateCrawl(Request urlEntry, final String stats, final String profileHandle) {
final CrawlProfile.entry profile = sb.crawler.profilesActiveCrawls.getEntry(profileHandle);
if (profile != null) {
// check if the protocol is supported
final yacyURL url = urlEntry.url();
final String urlProtocol = url.getProtocol();
if (sb.loader.isSupportedProtocol(urlProtocol)) {
if (this.log.isFine())
log.logFine(stats + ": URL=" + urlEntry.url()
+ ", initiator=" + urlEntry.initiator()
+ ", crawlOrder=" + ((profile.remoteIndexing()) ? "true" : "false")
+ ", depth=" + urlEntry.depth()
+ ", crawlDepth=" + profile.depth()
+ ", must-match=" + profile.mustMatchPattern().toString()
+ ", must-not-match=" + profile.mustNotMatchPattern().toString()
+ ", permission=" + ((sb.peers == null) ? "undefined" : (((sb.peers.mySeed().isSenior()) || (sb.peers.mySeed().isPrincipal())) ? "true" : "false")));
// work off one Crawl stack entry
if ((urlEntry == null) || (urlEntry.url() == null)) {
log.logInfo(stats + ": urlEntry = null");
} else {
new crawlWorker(urlEntry);
}
} else {
this.log.logSevere("Unsupported protocol in URL '" + url.toString());
}
} else {
log.logWarning(stats + ": LOST PROFILE HANDLE '" + urlEntry.profileHandle() + "' for URL " + urlEntry.url());
}
}
/**
* if crawling was paused we have to wait until we were notified to continue
* blocks until pause is ended
* @param crawljob
* @return
*/
private boolean isPaused(String crawljob) {
final Object[] status = sb.crawlJobsStatus.get(crawljob);
boolean pauseEnded = false;
synchronized(status[SwitchboardConstants.CRAWLJOB_SYNC]) {
if (((Boolean)status[SwitchboardConstants.CRAWLJOB_STATUS]).booleanValue()) {
try {
status[SwitchboardConstants.CRAWLJOB_SYNC].wait();
}
catch (final InterruptedException e) { pauseEnded = true;}
}
}
return pauseEnded;
}
/**
* Checks if crawl queue has elements and new crawl will not exceed thread-limit
* @param stackType
* @param type
* @return
*/
private boolean crawlIsPossible(int stackType, final String type) {
int value;
//System.out.println("stacksize = " + noticeURL.stackSize(stackType));
if (noticeURL.stackSize(stackType) == 0) {
//log.logDebug("GlobalCrawl: queue is empty");
return false;
}
value = (int) sb.getConfigLong(SwitchboardConstants.CRAWLER_THREADS_ACTIVE_MAX, 10);
if (this.size() >= value) {
// try a cleanup
this.cleanup();
}
// check again
if (this.size() >= value) {
if (this.log.isFine()) {
log.logFine(type + "Crawl: too many processes in loader queue, dismissed (" + "cacheLoader=" + this.size() + "), httpClients = " + Client.connectionCount());
}
return false;
}
String cautionCause = sb.onlineCaution();
if (cautionCause != null) {
if (this.log.isFine()) {
log.logFine(type + "Crawl: online caution for " + cautionCause + ", omitting processing");
}
return false;
}
return true;
}
public boolean remoteCrawlLoaderJob() {
// check if we are allowed to crawl urls provided by other peers
if (!sb.peers.mySeed().getFlagAcceptRemoteCrawl()) {
//this.log.logInfo("remoteCrawlLoaderJob: not done, we are not allowed to do that");
return false;
}
// check if we are a senior peer
if (!sb.peers.mySeed().isActive()) {
//this.log.logInfo("remoteCrawlLoaderJob: not done, this should be a senior or principal peer");
return false;
}
if (this.size() >= sb.getConfigLong(SwitchboardConstants.CRAWLER_THREADS_ACTIVE_MAX, 10)) {
// try a cleanup
cleanup();
}
// check again
if (this.size() >= sb.getConfigLong(SwitchboardConstants.CRAWLER_THREADS_ACTIVE_MAX, 10)) {
if (this.log.isFine()) log.logFine("remoteCrawlLoaderJob: too many processes in loader queue, dismissed (" + "cacheLoader=" + this.size() + "), httpClients = " + Client.connectionCount());
return false;
}
String cautionCause = sb.onlineCaution();
if (cautionCause != null) {
if (this.log.isFine()) log.logFine("remoteCrawlLoaderJob: online caution for " + cautionCause + ", omitting processing");
return false;
}
if (remoteTriggeredCrawlJobSize() > 100) {
if (this.log.isFine()) log.logFine("remoteCrawlLoaderJob: the remote-triggered crawl job queue is filled, omitting processing");
return false;
}
if (coreCrawlJobSize() > 0 && sb.indexingStorageProcessor.queueSize() > 0) {
if (this.log.isFine()) log.logFine("remoteCrawlLoaderJob: a local crawl is running, omitting processing");
return false;
}
// check if we have an entry in the provider list, otherwise fill the list
yacySeed seed;
if (remoteCrawlProviderHashes.size() == 0) {
if (sb.peers != null && sb.peers.sizeConnected() > 0) {
final Iterator<yacySeed> e = PeerSelection.getProvidesRemoteCrawlURLs(sb.peers);
while (e.hasNext()) {
seed = e.next();
if (seed != null) {
remoteCrawlProviderHashes.add(seed.hash);
}
}
}
}
if (remoteCrawlProviderHashes.size() == 0) return false;
// take one entry from the provider list and load the entries from the remote peer
seed = null;
String hash = null;
while ((seed == null) && (remoteCrawlProviderHashes.size() > 0)) {
hash = remoteCrawlProviderHashes.remove(remoteCrawlProviderHashes.size() - 1);
if (hash == null) continue;
seed = sb.peers.get(hash);
if (seed == null) continue;
// check if the peer is inside our cluster
if ((sb.isRobinsonMode()) && (!sb.isInMyCluster(seed))) {
seed = null;
continue;
}
}
if (seed == null) return false;
// we know a peer which should provide remote crawl entries. load them now.
final RSSFeed feed = yacyClient.queryRemoteCrawlURLs(sb.peers, seed, 30, 60000);
if (feed == null || feed.size() == 0) {
// something is wrong with this provider. To prevent that we get not stuck with this peer
// we remove it from the peer list
sb.peers.peerActions.peerDeparture(seed, "no results from provided remote crawls");
// ask another peer
return remoteCrawlLoaderJob();
}
// parse the rss
yacyURL url, referrer;
Date loaddate;
for (final RSSMessage item: feed) {
//System.out.println("URL=" + item.getLink() + ", desc=" + item.getDescription() + ", pubDate=" + item.getPubDate());
// put url on remote crawl stack
try {
url = new yacyURL(item.getLink(), null);
} catch (final MalformedURLException e) {
url = null;
}
try {
referrer = new yacyURL(item.getReferrer(), null);
} catch (final MalformedURLException e) {
referrer = null;
}
try {
loaddate = DateFormatter.parseShortSecond(item.getPubDate());
} catch (final ParseException e) {
loaddate = new Date();
}
final String urlRejectReason = sb.crawlStacker.urlInAcceptedDomain(url);
if (urlRejectReason == null) {
// stack url
if (sb.getLog().isFinest()) sb.getLog().logFinest("crawlOrder: stack: url='" + url + "'");
sb.crawlStacker.enqueueEntry(new Request(
hash,
url,
(referrer == null) ? null : referrer.hash(),
item.getDescription(),
null,
loaddate,
sb.crawler.defaultRemoteProfile.handle(),
0,
0,
0
));
} else {
log.logWarning("crawlOrder: Rejected URL '" + urlToString(url) + "': " + urlRejectReason);
}
}
return true;
}
/**
* @param url
* @return
*/
private String urlToString(final yacyURL url) {
return (url == null ? "null" : url.toNormalform(true, false));
}
public int limitCrawlJobSize() {
return noticeURL.stackSize(NoticedURL.STACK_TYPE_LIMIT);
}
public int remoteTriggeredCrawlJobSize() {
return noticeURL.stackSize(NoticedURL.STACK_TYPE_REMOTE);
}
public boolean remoteTriggeredCrawlJob() {
// work off crawl requests that had been placed by other peers to our crawl stack
// do nothing if either there are private processes to be done
// or there is no global crawl on the stack
if (!crawlIsPossible(NoticedURL.STACK_TYPE_REMOTE, "Global")) return false;
if (isPaused(SwitchboardConstants.CRAWLJOB_REMOTE_TRIGGERED_CRAWL)) return false;
// we don't want to crawl a global URL globally, since WE are the global part. (from this point of view)
final String stats = "REMOTETRIGGEREDCRAWL[" + noticeURL.stackSize(NoticedURL.STACK_TYPE_CORE) + ", " + noticeURL.stackSize(NoticedURL.STACK_TYPE_LIMIT) + ", " + noticeURL.stackSize(NoticedURL.STACK_TYPE_OVERHANG) + ", "
+ noticeURL.stackSize(NoticedURL.STACK_TYPE_REMOTE) + "]";
try {
final Request urlEntry = noticeURL.pop(NoticedURL.STACK_TYPE_REMOTE, true, sb.crawler.profilesActiveCrawls);
final String profileHandle = urlEntry.profileHandle();
// System.out.println("DEBUG plasmaSwitchboard.processCrawling:
// profileHandle = " + profileHandle + ", urlEntry.url = " +
// urlEntry.url());
generateCrawl(urlEntry, stats, profileHandle);
return true;
} catch (final IOException e) {
log.logSevere(stats + ": CANNOT FETCH ENTRY: " + e.getMessage(), e);
if (e.getMessage().indexOf("hash is null") > 0) noticeURL.clear(NoticedURL.STACK_TYPE_REMOTE);
return true;
}
}
public int size() {
return workers.size();
}
protected final class crawlWorker extends Thread {
protected Request request;
private final Integer code;
private long start;
public crawlWorker(final Request entry) {
this.start = System.currentTimeMillis();
this.request = entry;
this.request.setStatus("worker-initialized", serverProcessorJob.STATUS_INITIATED);
this.code = Integer.valueOf(entry.hashCode());
if (!workers.containsKey(code)) {
workers.put(code, this);
this.start();
}
}
public long age() {
return System.currentTimeMillis() - start;
}
public void run() {
try {
// checking robots.txt for http(s) resources
this.request.setStatus("worker-checkingrobots", serverProcessorJob.STATUS_STARTED);
if ((request.url().getProtocol().equals("http") || request.url().getProtocol().equals("https")) && sb.robots.isDisallowed(request.url())) {
if (log.isFine()) log.logFine("Crawling of URL '" + request.url().toString() + "' disallowed by robots.txt.");
final ZURL.Entry eentry = errorURL.newEntry(
this.request,
sb.peers.mySeed().hash,
new Date(),
1,
"denied by robots.txt");
eentry.store();
errorURL.push(eentry);
this.request.setStatus("worker-disallowed", serverProcessorJob.STATUS_FINISHED);
} else {
// starting a load from the internet
this.request.setStatus("worker-loading", serverProcessorJob.STATUS_RUNNING);
String result = null;
// load a resource and push queue entry to switchboard queue
// returns null if everything went fine, a fail reason string if a problem occurred
try {
request.setStatus("loading", serverProcessorJob.STATUS_RUNNING);
Response response = sb.loader.load(request);
if (response == null) {
request.setStatus("error", serverProcessorJob.STATUS_FINISHED);
if (log.isFine()) log.logFine("problem loading " + request.url().toString() + ": no content (possibly caused by cache policy)");
result = "no content (possibly caused by cache policy)";
} else {
request.setStatus("loaded", serverProcessorJob.STATUS_RUNNING);
final boolean stored = sb.toIndexer(response);
request.setStatus("enqueued-" + ((stored) ? "ok" : "fail"), serverProcessorJob.STATUS_FINISHED);
result = (stored) ? null : "not enqueued to indexer";
}
} catch (IOException e) {
request.setStatus("error", serverProcessorJob.STATUS_FINISHED);
if (log.isFine()) log.logFine("problem loading " + request.url().toString() + ": " + e.getMessage());
result = "load error - " + e.getMessage();
}
if (result != null) {
final ZURL.Entry eentry = errorURL.newEntry(
this.request,
sb.peers.mySeed().hash,
new Date(),
1,
"cannot load: " + result);
eentry.store();
errorURL.push(eentry);
this.request.setStatus("worker-error", serverProcessorJob.STATUS_FINISHED);
} else {
this.request.setStatus("worker-processed", serverProcessorJob.STATUS_FINISHED);
}
}
} catch (final Exception e) {
final ZURL.Entry eentry = errorURL.newEntry(
this.request,
sb.peers.mySeed().hash,
new Date(),
1,
e.getMessage() + " - in worker");
eentry.store();
errorURL.push(eentry);
e.printStackTrace();
Client.initConnectionManager();
this.request.setStatus("worker-exception", serverProcessorJob.STATUS_FINISHED);
} finally {
crawlWorker w = workers.remove(code);
assert w != null;
}
}
}
}
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