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319 lines
16 KiB
319 lines
16 KiB
// HTTPLoader.java
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// ---------------
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://yacy.net
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// Frankfurt, Germany, 2006
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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.retrieval;
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import java.io.IOException;
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import java.util.Date;
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import net.yacy.document.TextParser;
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import net.yacy.kelondro.data.meta.DigestURI;
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import net.yacy.kelondro.logging.Log;
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import net.yacy.repository.Blacklist;
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import de.anomic.crawler.Latency;
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import de.anomic.http.client.Client;
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import de.anomic.http.server.HeaderFramework;
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import de.anomic.http.server.RequestHeader;
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import de.anomic.http.server.ResponseContainer;
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import de.anomic.search.Segments;
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import de.anomic.search.Switchboard;
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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 (" + Client.getSystemOST() +") http://yacy.net/bot.html";
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public static final String yacyUserAgent = "yacy (" + Client.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 Switchboard sb;
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private final Log log;
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public HTTPLoader(final Switchboard 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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public Response load(final Request entry, final boolean acceptOnlyParseable) throws IOException {
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long start = System.currentTimeMillis();
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Response doc = load(entry, acceptOnlyParseable, DEFAULT_CRAWLING_RETRY_COUNT);
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Latency.update(new String(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 Response load(final Request request, boolean acceptOnlyParseable, final int retryCount) throws IOException {
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if (retryCount < 0) {
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sb.crawlQueues.errorURL.push(request, sb.peers.mySeed().hash.getBytes(), new Date(), 1, "redirection counter exceeded");
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throw new IOException("Redirection counter exceeded for URL " + request.url().toString() + ". Processing aborted.");
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}
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final String host = request.url().getHost();
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if (host == null || host.length() < 2) throw new IOException("host is not well-formed: '" + host + "'");
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final String path = request.url().getFile();
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int port = request.url().getPort();
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final boolean ssl = request.url().getProtocol().equals("https");
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if (port < 0) port = (ssl) ? 443 : 80;
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// if not the right file type then reject file
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if (acceptOnlyParseable) {
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String supportError = TextParser.supportsExtension(request.url());
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if (supportError != null) {
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sb.crawlQueues.errorURL.push(request, sb.peers.mySeed().hash.getBytes(), new Date(), 1, supportError);
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throw new IOException("REJECTED WRONG EXTENSION TYPE: " + supportError);
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}
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}
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// check if url is in blacklist
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final String hostlow = host.toLowerCase();
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if (Switchboard.urlBlacklist.isListed(Blacklist.BLACKLIST_CRAWLER, hostlow, path)) {
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sb.crawlQueues.errorURL.push(request, sb.peers.mySeed().hash.getBytes(), new Date(), 1, "url in blacklist");
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throw new IOException("CRAWLER Rejecting URL '" + request.url().toString() + "'. URL is in blacklist.");
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}
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// take a file from the net
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Response response = null;
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final long maxFileSize = sb.getConfigLong("crawler.http.maxFileSize", DEFAULT_MAXFILESIZE);
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// create a request header
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final RequestHeader requestHeader = new RequestHeader();
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requestHeader.put(HeaderFramework.USER_AGENT, crawlerUserAgent);
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DigestURI refererURL = null;
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if (request.referrerhash() != null) refererURL = sb.getURL(Segments.Process.LOCALCRAWLING, request.referrerhash());
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if (refererURL != null) requestHeader.put(RequestHeader.REFERER, refererURL.toNormalform(true, true));
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requestHeader.put(HeaderFramework.ACCEPT_LANGUAGE, sb.getConfig("crawler.http.acceptLanguage", DEFAULT_LANGUAGE));
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requestHeader.put(HeaderFramework.ACCEPT_CHARSET, sb.getConfig("crawler.http.acceptCharset", DEFAULT_CHARSET));
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requestHeader.put(HeaderFramework.ACCEPT_ENCODING, sb.getConfig("crawler.http.acceptEncoding", DEFAULT_ENCODING));
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// HTTP-Client
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final Client client = new Client(socketTimeout, requestHeader);
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ResponseContainer res = null;
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try {
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// send request
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res = client.GET(request.url().toString(), maxFileSize);
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// FIXME: 30*-handling (bottom) is never reached
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// we always get the final content because httpClient.followRedirects = true
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if (res.getStatusCode() == 200 || res.getStatusCode() == 203) {
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// the transfer is ok
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if (acceptOnlyParseable) {
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// if the response has not the right file type then reject file
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String supportError = TextParser.supports(request.url(), res.getResponseHeader().mime());
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if (supportError != null) {
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sb.crawlQueues.errorURL.push(request, sb.peers.mySeed().hash.getBytes(), new Date(), 1, supportError);
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throw new IOException("REJECTED WRONG MIME TYPE, mime = " + res.getResponseHeader().mime() + ": " + supportError);
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}
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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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long 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.push(request, sb.peers.mySeed().hash.getBytes(), new Date(), 1, "file size limit exceeded");
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throw new IOException("REJECTED URL " + request.url() + " because file size '" + contentLength + "' exceeds max filesize limit of " + maxFileSize + " bytes. (GET)");
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}
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// create a new cache entry
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response = new Response(
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request,
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requestHeader,
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res.getResponseHeader(),
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res.getStatusLine(),
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sb.crawler.profilesActiveCrawls.getEntry(request.profileHandle()),
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responseBody
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);
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return response;
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} else if (res.getStatusLine().startsWith("30")) {
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if (res.getResponseHeader().containsKey(HeaderFramework.LOCATION)) {
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// getting redirection URL
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String redirectionUrlString = res.getResponseHeader().get(HeaderFramework.LOCATION);
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redirectionUrlString = redirectionUrlString.trim();
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if (redirectionUrlString.length() == 0) {
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sb.crawlQueues.errorURL.push(request, sb.peers.mySeed().hash.getBytes(), new Date(), 1, "redirection header empy");
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throw new IOException("CRAWLER Redirection of URL=" + request.url().toString() + " aborted. Location header is empty.");
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}
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// normalizing URL
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final DigestURI redirectionUrl = DigestURI.newURL(request.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 " + request.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.push(request, sb.peers.mySeed().hash.getBytes(), new Date(), 1, "server shutdown");
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throw new IOException("CRAWLER Retry of URL=" + request.url().toString() + " aborted because of server shutdown.");
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}
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// check if the url was already indexed
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final String dbname = sb.urlExists(Segments.Process.LOCALCRAWLING, redirectionUrl.hash());
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if (dbname != null) {
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sb.crawlQueues.errorURL.push(request, sb.peers.mySeed().hash.getBytes(), new Date(), 1, "redirection to double content");
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throw new IOException("CRAWLER Redirection of URL=" + request.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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request.redirectURL(redirectionUrl);
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return load(request, acceptOnlyParseable, 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.push(request, sb.peers.mySeed().hash.getBytes(), new Date(), 1, "wrong http status code " + res.getStatusCode() + ")");
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throw new IOException("REJECTED WRONG STATUS TYPE '" + res.getStatusLine() + "' for URL " + request.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 response;
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}
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public static Response load(final Request request) throws IOException {
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return load(request, 3);
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}
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private static Response load(final Request request, int retryCount) throws IOException {
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if (retryCount < 0) {
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throw new IOException("Redirection counter exceeded for URL " + request.url().toString() + ". Processing aborted.");
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}
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final String host = request.url().getHost();
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if (host == null || host.length() < 2) throw new IOException("host is not well-formed: '" + host + "'");
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final String path = request.url().getFile();
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int port = request.url().getPort();
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final boolean ssl = request.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 (Switchboard.urlBlacklist != null && Switchboard.urlBlacklist.isListed(Blacklist.BLACKLIST_CRAWLER, hostlow, path)) {
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throw new IOException("CRAWLER Rejecting URL '" + request.url().toString() + "'. URL is in blacklist.");
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}
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// take a file from the net
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Response response = null;
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// create a request header
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final RequestHeader requestHeader = new RequestHeader();
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requestHeader.put(HeaderFramework.USER_AGENT, crawlerUserAgent);
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requestHeader.put(HeaderFramework.ACCEPT_LANGUAGE, DEFAULT_LANGUAGE);
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requestHeader.put(HeaderFramework.ACCEPT_CHARSET, DEFAULT_CHARSET);
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requestHeader.put(HeaderFramework.ACCEPT_ENCODING, DEFAULT_ENCODING);
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// HTTP-Client
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final Client client = new Client(20000, requestHeader);
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ResponseContainer res = null;
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try {
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// send request
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res = client.GET(request.url().toString(), Long.MAX_VALUE);
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// FIXME: 30*-handling (bottom) is never reached
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// we always get the final content because httpClient.followRedirects = true
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if (res.getStatusCode() == 200 || res.getStatusCode() == 203) {
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// the transfer is ok
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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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// create a new cache entry
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response = new Response(
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request,
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requestHeader,
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res.getResponseHeader(),
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res.getStatusLine(),
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null,
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responseBody
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);
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return response;
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} else if (res.getStatusLine().startsWith("30")) {
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if (res.getResponseHeader().containsKey(HeaderFramework.LOCATION)) {
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// getting redirection URL
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String redirectionUrlString = res.getResponseHeader().get(HeaderFramework.LOCATION);
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redirectionUrlString = redirectionUrlString.trim();
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if (redirectionUrlString.length() == 0) {
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throw new IOException("CRAWLER Redirection of URL=" + request.url().toString() + " aborted. Location header is empty.");
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}
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// normalizing URL
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final DigestURI redirectionUrl = DigestURI.newURL(request.url(), redirectionUrlString);
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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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throw new IOException("CRAWLER Retry of URL=" + request.url().toString() + " aborted because of server shutdown.");
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}
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// retry crawling with new url
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request.redirectURL(redirectionUrl);
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return load(request, 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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throw new IOException("REJECTED WRONG STATUS TYPE '" + res.getStatusLine() + "' for URL " + request.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 response;
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}
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}
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