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250 lines
13 KiB
250 lines
13 KiB
//plasmaCrawlWorker.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, 2006
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//
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// $LastChangedDate: 2006-08-12 16:28:14 +0200 (Sa, 12 Aug 2006) $
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// $LastChangedRevision: 2397 $
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// $LastChangedBy: theli $
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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.io.IOException;
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import java.util.Date;
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import de.anomic.data.Blacklist;
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import de.anomic.http.httpClient;
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import de.anomic.http.httpResponse;
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import de.anomic.http.httpRequestHeader;
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import de.anomic.http.httpResponseHeader;
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import de.anomic.http.httpdProxyCacheEntry;
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import de.anomic.kelondro.util.Log;
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import de.anomic.plasma.plasmaHTCache;
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import de.anomic.plasma.plasmaParser;
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import de.anomic.plasma.plasmaSwitchboard;
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import de.anomic.plasma.parser.Document;
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import de.anomic.yacy.yacyURL;
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public final class HTTPLoader {
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private static final String DEFAULT_ENCODING = "gzip,deflate";
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private static final String DEFAULT_LANGUAGE = "en-us,en;q=0.5";
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private static final String DEFAULT_CHARSET = "ISO-8859-1,utf-8;q=0.7,*;q=0.7";
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private static final long DEFAULT_MAXFILESIZE = 1024 * 1024 * 10;
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public static final int DEFAULT_CRAWLING_RETRY_COUNT = 5;
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public static final String crawlerUserAgent = "yacybot (" + httpClient.getSystemOST() +") http://yacy.net/bot.html";
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public static final String yacyUserAgent = "yacy (" + httpClient.getSystemOST() +") yacy.net";
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/**
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* The socket timeout that should be used
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*/
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private final int socketTimeout;
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/**
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* The maximum allowed file size
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*/
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//private long maxFileSize = -1;
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//private String acceptEncoding;
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//private String acceptLanguage;
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//private String acceptCharset;
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private final plasmaSwitchboard sb;
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private final Log log;
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public HTTPLoader(final plasmaSwitchboard sb, final Log theLog) {
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this.sb = sb;
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this.log = theLog;
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// refreshing timeout value
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this.socketTimeout = (int) sb.getConfigLong("crawler.clientTimeout", 10000);
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}
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/**
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* @param entry
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* @param requestDate
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* @param requestHeader
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* @param responseHeader
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* @param responseStatus Status-Code SPACE Reason-Phrase
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* @return
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*/
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protected Document createCacheEntry(final CrawlEntry entry, final Date requestDate, final httpRequestHeader requestHeader, final httpResponseHeader responseHeader, final String responseStatus) {
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Document metadata = new httpdProxyCacheEntry(
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entry.depth(),
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entry.url(),
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entry.name(),
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responseStatus,
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requestHeader,
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responseHeader,
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entry.initiator(),
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sb.crawler.profilesActiveCrawls.getEntry(entry.profileHandle())
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);
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plasmaHTCache.storeMetadata(responseHeader, metadata);
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return metadata;
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}
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public Document load(final CrawlEntry entry, final String parserMode) throws IOException {
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long start = System.currentTimeMillis();
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Document doc = load(entry, parserMode, DEFAULT_CRAWLING_RETRY_COUNT);
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Latency.update(entry.url().hash().substring(6), entry.url().getHost(), System.currentTimeMillis() - start);
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return doc;
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}
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private Document load(final CrawlEntry entry, final String parserMode, final int retryCount) throws IOException {
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if (retryCount < 0) {
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sb.crawlQueues.errorURL.newEntry(entry, sb.peers.mySeed().hash, new Date(), 1, "redirection counter exceeded").store();
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throw new IOException("Redirection counter exceeded for URL " + entry.url().toString() + ". Processing aborted.");
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}
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final Date requestDate = new Date(); // remember the time...
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final String host = entry.url().getHost();
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final String path = entry.url().getFile();
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int port = entry.url().getPort();
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final boolean ssl = entry.url().getProtocol().equals("https");
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if (port < 0) port = (ssl) ? 443 : 80;
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// check if url is in blacklist
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final String hostlow = host.toLowerCase();
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if (plasmaSwitchboard.urlBlacklist.isListed(Blacklist.BLACKLIST_CRAWLER, hostlow, path)) {
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sb.crawlQueues.errorURL.newEntry(entry, sb.peers.mySeed().hash, new Date(), 1, "url in blacklist").store();
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throw new IOException("CRAWLER Rejecting URL '" + entry.url().toString() + "'. URL is in blacklist.");
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}
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// take a file from the net
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Document htCache = null;
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final long maxFileSize = sb.getConfigLong("crawler.http.maxFileSize", DEFAULT_MAXFILESIZE);
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//try {
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// create a request header
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final httpRequestHeader requestHeader = new httpRequestHeader();
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requestHeader.put(httpRequestHeader.USER_AGENT, crawlerUserAgent);
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yacyURL refererURL = null;
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if (entry.referrerhash() != null) refererURL = sb.getURL(entry.referrerhash());
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if (refererURL != null) requestHeader.put(httpRequestHeader.REFERER, refererURL.toNormalform(true, true));
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requestHeader.put(httpRequestHeader.ACCEPT_LANGUAGE, sb.getConfig("crawler.http.acceptLanguage", DEFAULT_LANGUAGE));
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requestHeader.put(httpRequestHeader.ACCEPT_CHARSET, sb.getConfig("crawler.http.acceptCharset", DEFAULT_CHARSET));
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requestHeader.put(httpRequestHeader.ACCEPT_ENCODING, sb.getConfig("crawler.http.acceptEncoding", DEFAULT_ENCODING));
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// HTTP-Client
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final httpClient client = new httpClient(socketTimeout, requestHeader);
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httpResponse res = null;
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try {
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// send request
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res = client.GET(entry.url().toString());
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if (res.getStatusCode() == 200 || res.getStatusCode() == 203) {
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// the transfer is ok
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// create a new cache entry
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htCache = createCacheEntry(entry, requestDate, requestHeader, res.getResponseHeader(), res.getStatusLine());
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// request has been placed and result has been returned. work off response
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//try {
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if (plasmaParser.supportedContent(parserMode, entry.url(), res.getResponseHeader().mime())) {
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// get the content length and check if the length is allowed
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long contentLength = res.getResponseHeader().getContentLength();
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if (maxFileSize >= 0 && contentLength > maxFileSize) {
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sb.crawlQueues.errorURL.newEntry(entry, sb.peers.mySeed().hash, new Date(), 1, "file size limit exceeded");
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throw new IOException("REJECTED URL " + entry.url() + " because file size '" + contentLength + "' exceeds max filesize limit of " + maxFileSize + " bytes.");
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}
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// we write the new cache entry to file system directly
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res.setAccountingName("CRAWLER");
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final byte[] responseBody = res.getData();
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contentLength = responseBody.length;
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// check length again in case it was not possible to get the length before loading
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if (maxFileSize >= 0 && contentLength > maxFileSize) {
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sb.crawlQueues.errorURL.newEntry(entry, sb.peers.mySeed().hash, new Date(), 1, "file size limit exceeded");
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throw new IOException("REJECTED URL " + entry.url() + " because file size '" + contentLength + "' exceeds max filesize limit of " + maxFileSize + " bytes.");
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}
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htCache.setCacheArray(responseBody);
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} else {
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// if the response has not the right file type then reject file
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sb.crawlQueues.errorURL.newEntry(entry, sb.peers.mySeed().hash, new Date(), 1, "wrong mime type or wrong extension");
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throw new IOException("REJECTED WRONG MIME/EXT TYPE " + res.getResponseHeader().mime() + " for URL " + entry.url().toString());
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}
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return htCache;
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/*
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} catch (final SocketException e) {
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// this may happen if the client suddenly closes its connection
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// maybe the user has stopped loading
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// in that case, we are not responsible and just forget it
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// but we clean the cache also, since it may be only partial
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// and most possible corrupted
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this.log.logSevere("CRAWLER LOADER ERROR1: with URL=" + entry.url().toString() + ": " + e.toString());
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sb.crawlQueues.errorURL.newEntry(entry, sb.webIndex.seedDB.mySeed().hash, new Date(), 1, ErrorURL.DENIED_CONNECTION_ERROR);
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htCache = null;
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}*/
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} else if (res.getStatusLine().startsWith("30")) {
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if (res.getResponseHeader().containsKey(httpRequestHeader.LOCATION)) {
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// getting redirection URL
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String redirectionUrlString = res.getResponseHeader().get(httpRequestHeader.LOCATION);
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redirectionUrlString = redirectionUrlString.trim();
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if (redirectionUrlString.length() == 0) {
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sb.crawlQueues.errorURL.newEntry(entry, sb.peers.mySeed().hash, new Date(), 1, "redirection header empy");
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throw new IOException("CRAWLER Redirection of URL=" + entry.url().toString() + " aborted. Location header is empty.");
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}
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// normalizing URL
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final yacyURL redirectionUrl = yacyURL.newURL(entry.url(), redirectionUrlString);
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// restart crawling with new url
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this.log.logInfo("CRAWLER Redirection detected ('" + res.getStatusLine() + "') for URL " + entry.url().toString());
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this.log.logInfo("CRAWLER ..Redirecting request to: " + redirectionUrl);
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// if we are already doing a shutdown we don't need to retry crawling
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if (Thread.currentThread().isInterrupted()) {
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sb.crawlQueues.errorURL.newEntry(entry, sb.peers.mySeed().hash, new Date(), 1, "server shutdown");
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throw new IOException("CRAWLER Retry of URL=" + entry.url().toString() + " aborted because of server shutdown.");
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}
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// generating url hash
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final String urlhash = redirectionUrl.hash();
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// check if the url was already indexed
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final String dbname = sb.urlExists(urlhash);
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if (dbname != null) {
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sb.crawlQueues.errorURL.newEntry(entry, sb.peers.mySeed().hash, new Date(), 1, "redirection to double content");
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throw new IOException("CRAWLER Redirection of URL=" + entry.url().toString() + " ignored. The url appears already in db " + dbname);
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}
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// retry crawling with new url
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entry.redirectURL(redirectionUrl);
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return load(entry, plasmaParser.PARSER_MODE_URLREDIRECTOR, retryCount - 1);
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}
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} else {
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// if the response has not the right response type then reject file
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sb.crawlQueues.errorURL.newEntry(entry, sb.peers.mySeed().hash, new Date(), 1, "wrong http status code " + res.getStatusCode() + ")");
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throw new IOException("REJECTED WRONG STATUS TYPE '" + res.getStatusLine() + "' for URL " + entry.url().toString());
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}
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} finally {
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if(res != null) {
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// release connection
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res.closeStream();
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}
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}
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return htCache;
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}
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}
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