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333 lines
19 KiB
333 lines
19 KiB
//plasmaCrawlWorker.java
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//------------------------
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//part of YaCy
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//(C) by Michael Peter Christen; mc@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.http.HttpClient;
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import de.anomic.http.JakartaCommonsHttpClient;
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import de.anomic.http.JakartaCommonsHttpResponse;
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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.index.indexDocumentMetadata;
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import de.anomic.index.indexReferenceBlacklist;
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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.server.logging.serverLog;
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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 serverLog log;
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public HTTPLoader(final plasmaSwitchboard sb, final serverLog 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 indexDocumentMetadata createCacheEntry(final CrawlEntry entry, final Date requestDate, final httpRequestHeader requestHeader, final httpResponseHeader responseHeader, final String responseStatus) {
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indexDocumentMetadata 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.webIndex.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 indexDocumentMetadata load(final CrawlEntry entry, final String parserMode) throws IOException {
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return load(entry, parserMode, DEFAULT_CRAWLING_RETRY_COUNT);
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}
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private indexDocumentMetadata 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.webIndex.seedDB.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(indexReferenceBlacklist.BLACKLIST_CRAWLER, hostlow, path)) {
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sb.crawlQueues.errorURL.newEntry(entry, sb.webIndex.seedDB.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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indexDocumentMetadata 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 JakartaCommonsHttpClient client = new JakartaCommonsHttpClient(socketTimeout, requestHeader);
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JakartaCommonsHttpResponse 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.webIndex.seedDB.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.webIndex.seedDB.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.webIndex.seedDB.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.webIndex.seedDB.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.webIndex.seedDB.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.webIndex.seedDB.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.webIndex.seedDB.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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/*
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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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} catch (final Exception e) {
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final String errorMsg = e.getMessage();
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String failreason = null;
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if ((e instanceof IOException) &&
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(errorMsg != null) &&
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(errorMsg.indexOf("socket closed") >= 0) &&
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(Thread.currentThread().isInterrupted())
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) {
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this.log.logInfo("CRAWLER Interruption detected because of server shutdown.");
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failreason = ErrorURL.DENIED_SERVER_SHUTDOWN;
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} else if (e instanceof httpdLimitExceededException) {
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this.log.logWarning("CRAWLER Max file size limit '" + maxFileSize + "' exceeded while downloading URL " + entry.url());
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failreason = ErrorURL.DENIED_FILESIZE_LIMIT_EXCEEDED;
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} else if (e instanceof MalformedURLException) {
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this.log.logWarning("CRAWLER Malformed URL '" + entry.url().toString() + "' detected. ");
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failreason = ErrorURL.DENIED_MALFORMED_URL;
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} else if (e instanceof NoRouteToHostException) {
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this.log.logWarning("CRAWLER No route to host found while trying to crawl URL '" + entry.url().toString() + "'.");
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failreason = ErrorURL.DENIED_NO_ROUTE_TO_HOST;
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} else if ((e instanceof UnknownHostException) ||
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((errorMsg != null) && (errorMsg.indexOf("unknown host") >= 0))) {
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final yacyURL u = (entry.referrerhash() == null) ? null : sb.getURL(entry.referrerhash());
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this.log.logWarning("CRAWLER Unknown host in URL '" + entry.url() + "'. " +
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"Referer URL: " + ((u == null) ? "Unknown" : u.toNormalform(true, true)));
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failreason = ErrorURL.DENIED_UNKNOWN_HOST;
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} else if (e instanceof java.net.BindException) {
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this.log.logWarning("CRAWLER BindException detected while trying to download content from '" + entry.url().toString() +
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"'. Retrying request.");
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failreason = ErrorURL.DENIED_CONNECTION_BIND_EXCEPTION;
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} else if ((errorMsg != null) && (
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(errorMsg.indexOf("Corrupt GZIP trailer") >= 0) ||
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(errorMsg.indexOf("Not in GZIP format") >= 0) ||
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(errorMsg.indexOf("Unexpected end of ZLIB") >= 0)
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)) {
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this.log.logWarning("CRAWLER Problems detected while receiving gzip encoded content from '" + entry.url().toString() +
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"'. Retrying request without using gzip content encoding.");
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failreason = ErrorURL.DENIED_CONTENT_DECODING_ERROR;
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} else if ((errorMsg != null) && (errorMsg.indexOf("The host did not accept the connection within timeout of") >= 0)) {
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this.log.logWarning("CRAWLER Timeout while trying to connect to '" + entry.url().toString() +
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"'. Retrying request.");
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failreason = ErrorURL.DENIED_CONNECTION_TIMEOUT;
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} else if ((errorMsg != null) && (errorMsg.indexOf("Read timed out") >= 0)) {
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this.log.logWarning("CRAWLER Read timeout while receiving content from '" + entry.url().toString() +
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"'. Retrying request.");
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failreason = ErrorURL.DENIED_CONNECTION_TIMEOUT;
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} else if ((errorMsg != null) && (errorMsg.indexOf("connect timed out") >= 0)) {
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this.log.logWarning("CRAWLER Timeout while trying to connect to '" + entry.url().toString() +
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"'. Retrying request.");
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failreason = ErrorURL.DENIED_CONNECTION_TIMEOUT;
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} else if ((errorMsg != null) && (errorMsg.indexOf("Connection timed out") >= 0)) {
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this.log.logWarning("CRAWLER Connection timeout while receiving content from '" + entry.url().toString() +
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"'. Retrying request.");
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failreason = ErrorURL.DENIED_CONNECTION_TIMEOUT;
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} else if ((errorMsg != null) && (errorMsg.indexOf("Connection refused") >= 0)) {
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this.log.logWarning("CRAWLER Connection refused while trying to connect to '" + entry.url().toString() + "'.");
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failreason = ErrorURL.DENIED_CONNECTION_REFUSED;
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} else if ((errorMsg != null) && (errorMsg.indexOf("Circular redirect to '")>= 0)) {
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this.log.logWarning("CRAWLER Redirect Error with URL '" + entry.url().toString() + "': "+ e.toString());
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failreason = ErrorURL.DENIED_REDIRECTION_COUNTER_EXCEEDED;
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} else if ((errorMsg != null) && (errorMsg.indexOf("There is not enough space on the disk") >= 0)) {
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this.log.logSevere("CRAWLER Not enough space on the disk detected while crawling '" + entry.url().toString() + "'. " +
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"Pausing crawlers. ");
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sb.pauseCrawlJob(plasmaSwitchboardConstants.CRAWLJOB_LOCAL_CRAWL);
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sb.pauseCrawlJob(plasmaSwitchboardConstants.CRAWLJOB_REMOTE_TRIGGERED_CRAWL);
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failreason = ErrorURL.DENIED_OUT_OF_DISK_SPACE;
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} else if ((errorMsg != null) && (errorMsg.indexOf("Network is unreachable") >=0)) {
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this.log.logSevere("CRAWLER Network is unreachable while trying to crawl URL '" + entry.url().toString() + "'. ");
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failreason = ErrorURL.DENIED_NETWORK_IS_UNREACHABLE;
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} else if ((errorMsg != null) && (errorMsg.indexOf("No trusted certificate found")>= 0)) {
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this.log.logSevere("CRAWLER No trusted certificate found for URL '" + entry.url().toString() + "'. ");
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failreason = ErrorURL.DENIED_SSL_UNTRUSTED_CERT;
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} else {
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this.log.logSevere("CRAWLER Unexpected Error with URL '" + entry.url().toString() + "': " + e.toString(), e);
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failreason = ErrorURL.DENIED_CONNECTION_ERROR;
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}
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if (failreason != null) {
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// add url into error db
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sb.crawlQueues.errorURL.newEntry(entry, sb.webIndex.seedDB.mySeed().hash, new Date(), 1, failreason);
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}
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return null;
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}*/
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}
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}
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