mirror of
https://github.com/yacy/yacy_search_server.git
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543 lines
26 KiB
Java
543 lines
26 KiB
Java
// 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 net.yacy.crawler.retrieval;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import org.apache.http.HttpStatus;
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import org.apache.http.StatusLine;
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import net.yacy.cora.document.id.DigestURL;
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import net.yacy.cora.federate.solr.FailCategory;
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import net.yacy.cora.protocol.ClientIdentification;
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import net.yacy.cora.protocol.HeaderFramework;
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import net.yacy.cora.protocol.RequestHeader;
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import net.yacy.cora.protocol.ResponseHeader;
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import net.yacy.cora.protocol.http.HTTPClient;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.cora.util.HTTPInputStream;
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import net.yacy.cora.util.StrictLimitInputStream;
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import net.yacy.crawler.CrawlSwitchboard;
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import net.yacy.crawler.data.Cache;
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import net.yacy.crawler.data.CrawlProfile;
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import net.yacy.crawler.data.Latency;
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import net.yacy.kelondro.io.ByteCount;
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import net.yacy.kelondro.util.Formatter;
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import net.yacy.repository.Blacklist.BlacklistType;
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import net.yacy.search.Switchboard;
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import net.yacy.search.SwitchboardConstants;
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import net.yacy.server.http.AlternativeDomainNames;
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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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public static final String DEFAULT_ACCEPT = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
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public static final int DEFAULT_MAXFILESIZE = 1024 * 1024 * 10;
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public static final int DEFAULT_CRAWLING_RETRY_COUNT = 5;
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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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private final Switchboard sb;
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private final ConcurrentLog log;
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public HTTPLoader(final Switchboard sb, final ConcurrentLog 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", 30000);
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}
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public Response load(final Request entry, CrawlProfile profile, final int maxFileSize, final BlacklistType blacklistType, final ClientIdentification.Agent agent) throws IOException {
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// load fulltext of html page
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Latency.updateBeforeLoad(entry.url());
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final long start = System.currentTimeMillis();
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final Response doc = load(entry, profile, DEFAULT_CRAWLING_RETRY_COUNT, maxFileSize, blacklistType, agent);
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Latency.updateAfterLoad(entry.url(), System.currentTimeMillis() - start);
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return doc;
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}
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/**
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* Open an input stream on a requested HTTP resource. When the resource content size is small
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* (lower than {@link Response#CRAWLER_MAX_SIZE_TO_CACHE}, fully load it and use a ByteArrayInputStream instance.
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* @param request
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* @param profile crawl profile
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* @param retryCount remaining redirect retries count
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* @param maxFileSize max file size to load. -1 means no limit.
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* @param blacklistType blacklist type to use
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* @param agent agent identifier
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* @return a response with full meta data and embedding on open input stream on content. Don't forget to close the stream.
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* @throws IOException when an error occurred
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*/
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public StreamResponse openInputStream(final Request request, CrawlProfile profile, final int retryCount,
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final int maxFileSize, final BlacklistType blacklistType, final ClientIdentification.Agent agent)
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throws IOException {
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if (retryCount < 0) {
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this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile,
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FailCategory.TEMPORARY_NETWORK_FAILURE, "retry counter exceeded", -1);
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throw new IOException(
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"retry counter exceeded for URL " + request.url().toString() + ". Processing aborted.$");
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}
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DigestURL url = request.url();
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final String host = url.getHost();
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if (host == null || host.length() < 2) {
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throw new IOException("host is not well-formed: '" + host + "'");
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}
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final String path = url.getFile();
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int port = url.getPort();
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final boolean ssl = url.getProtocol().equals("https");
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if (port < 0)
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port = (ssl) ? 443 : 80;
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// check if url is in blacklist
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final String hostlow = host.toLowerCase();
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if (blacklistType != null && Switchboard.urlBlacklist.isListed(blacklistType, hostlow, path)) {
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this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.FINAL_LOAD_CONTEXT,
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"url in blacklist", -1);
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throw new IOException("CRAWLER Rejecting URL '" + request.url().toString() + "'. URL is in blacklist.$");
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}
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// resolve yacy and yacyh domains
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final AlternativeDomainNames yacyResolver = this.sb.peers;
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if (yacyResolver != null) {
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final String yAddress = yacyResolver.resolve(host);
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if (yAddress != null) {
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url = new DigestURL(url.getProtocol() + "://" + yAddress + path);
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}
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}
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// create a request header
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final RequestHeader requestHeader = createRequestheader(request, agent);
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// HTTP-Client
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final HTTPClient client = new HTTPClient(agent);
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client.setRedirecting(false); // we want to handle redirection
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// ourselves, so we don't index pages
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// twice
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client.setTimout(this.socketTimeout);
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client.setHeader(requestHeader.entrySet());
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// send request
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client.GET(url, false);
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final StatusLine statusline = client.getHttpResponse().getStatusLine();
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final int statusCode = statusline.getStatusCode();
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final ResponseHeader responseHeader = new ResponseHeader(statusCode, client.getHttpResponse().getAllHeaders());
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String requestURLString = request.url().toNormalform(true);
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// check redirection
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if (statusCode > 299 && statusCode < 310) {
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client.finish();
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final DigestURL redirectionUrl = extractRedirectURL(request, profile, url, statusline,
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responseHeader, requestURLString);
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if (this.sb.getConfigBool(SwitchboardConstants.CRAWLER_FOLLOW_REDIRECTS, true)) {
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// we have two use cases here: loading from a crawl or just
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// loading the url. Check this:
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if (profile != null && !CrawlSwitchboard.DEFAULT_PROFILES.contains(profile.name())) {
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// put redirect url on the crawler queue to repeat a
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// double-check
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/* We have to clone the request instance and not to modify directly its URL,
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* otherwise the stackCrawl() function would reject it, because detecting it as already in the activeWorkerEntries */
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Request redirectedRequest = new Request(request.initiator(),
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redirectionUrl,
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request.referrerhash(),
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request.name(),
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request.appdate(),
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request.profileHandle(),
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request.depth(),
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request.timezoneOffset());
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String rejectReason = this.sb.crawlStacker.stackCrawl(redirectedRequest);
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if(rejectReason != null) {
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throw new IOException("CRAWLER Redirect of URL=" + requestURLString + " aborted. Reason : " + rejectReason);
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}
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// in the end we must throw an exception (even if this is
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// not an error, just to abort the current process
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throw new IOException("CRAWLER Redirect of URL=" + requestURLString + " to "
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+ redirectionUrl.toNormalform(false) + " placed on crawler queue for double-check");
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}
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// if we are already doing a shutdown we don't need to retry
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// crawling
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if (Thread.currentThread().isInterrupted()) {
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this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile,
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FailCategory.FINAL_LOAD_CONTEXT, "server shutdown", statusCode);
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throw new IOException(
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"CRAWLER Redirect of URL=" + requestURLString + " aborted because of server shutdown.$");
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}
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// retry crawling with new url
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request.redirectURL(redirectionUrl);
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return openInputStream(request, profile, retryCount - 1, maxFileSize, blacklistType, agent);
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}
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// we don't want to follow redirects
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this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile,
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FailCategory.FINAL_PROCESS_CONTEXT, "redirection not wanted", statusCode);
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throw new IOException("REJECTED UNWANTED REDIRECTION '" + statusline
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+ "' for URL '" + requestURLString + "'$");
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} else if (statusCode == HttpStatus.SC_OK || statusCode == HttpStatus.SC_NON_AUTHORITATIVE_INFORMATION) {
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// the transfer is ok
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/*
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* When content is not large (less than Response.CRAWLER_MAX_SIZE_TO_CACHE), we have better cache it if cache is enabled and url is not local
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*/
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long contentLength = client.getHttpResponse().getEntity().getContentLength();
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InputStream contentStream;
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if (profile != null && profile.storeHTCache() && contentLength > 0 && contentLength < (Response.CRAWLER_MAX_SIZE_TO_CACHE) && !url.isLocal()) {
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byte[] content = null;
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try {
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content = HTTPClient.getByteArray(client.getHttpResponse().getEntity(), maxFileSize);
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Cache.store(url, responseHeader, content);
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} catch (final IOException e) {
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this.log.warn("cannot write " + url + " to Cache (3): " + e.getMessage(), e);
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} finally {
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client.finish();
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}
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contentStream = new ByteArrayInputStream(content);
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} else {
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/*
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* Content length may already be known now : check it before opening a stream
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*/
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if (maxFileSize >= 0 && contentLength > maxFileSize) {
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throw new IOException("Content to download exceed maximum value of " + maxFileSize + " bytes");
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}
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/*
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* Create a HTTPInputStream delegating to
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* client.getContentstream(). Close method will ensure client is
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* properly closed.
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*/
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contentStream = new HTTPInputStream(client);
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/* Anticipated content length may not be already known or incorrect : let's apply now the same eventual content size restriction as when loading in a byte array */
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if(maxFileSize >= 0) {
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contentStream = new StrictLimitInputStream(contentStream, maxFileSize,
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"Content to download exceed maximum value of " + Formatter.bytesToString(maxFileSize));
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}
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}
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return new StreamResponse(new Response(request, requestHeader, responseHeader, profile, false, null), contentStream);
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} else {
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client.finish();
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// if the response has not the right response type then reject file
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this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile,
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FailCategory.TEMPORARY_NETWORK_FAILURE, "wrong http status code", statusCode);
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throw new IOException("REJECTED WRONG STATUS TYPE '" + statusline
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+ "' for URL '" + requestURLString + "'$");
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}
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}
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/**
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* Extract redirect URL from response header. Status code is supposed to be between 299 and 310. Parameters must not be null.
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* @return redirect URL
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* @throws IOException when an error occured
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*/
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private DigestURL extractRedirectURL(final Request request, CrawlProfile profile, DigestURL url,
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final StatusLine statusline, final ResponseHeader responseHeader, String requestURLString)
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throws IOException {
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// read redirection URL
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String redirectionUrlString = responseHeader.get(HeaderFramework.LOCATION);
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redirectionUrlString = redirectionUrlString == null ? "" : redirectionUrlString.trim();
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if (redirectionUrlString.isEmpty()) {
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this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile,
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FailCategory.TEMPORARY_NETWORK_FAILURE,
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"no redirection url provided, field '" + HeaderFramework.LOCATION + "' is empty", statusline.getStatusCode());
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throw new IOException("REJECTED EMTPY REDIRECTION '" + statusline
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+ "' for URL '" + requestURLString + "'$");
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}
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// normalize URL
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final DigestURL redirectionUrl = DigestURL.newURL(request.url(), redirectionUrlString);
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// restart crawling with new url
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this.log.info("CRAWLER Redirection detected ('" + statusline + "') for URL "
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+ requestURLString);
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this.log.info("CRAWLER ..Redirecting request to: " + redirectionUrl.toNormalform(false));
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this.sb.webStructure.generateCitationReference(url, redirectionUrl);
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if (this.sb.getConfigBool(SwitchboardConstants.CRAWLER_RECORD_REDIRECTS, true)) {
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this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile,
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FailCategory.FINAL_REDIRECT_RULE, "redirect to " + redirectionUrlString, statusline.getStatusCode());
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}
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return redirectionUrl;
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}
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/**
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* Create request header for loading content.
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* @param request search request
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* @param agent agent identification information
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* @return a request header
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* @throws IOException when an error occured
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*/
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private RequestHeader createRequestheader(final Request request, final ClientIdentification.Agent agent)
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throws IOException {
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final RequestHeader requestHeader = new RequestHeader();
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requestHeader.put(HeaderFramework.USER_AGENT, agent.userAgent);
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if (request.referrerhash() != null) {
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DigestURL refererURL = this.sb.getURL(request.referrerhash());
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if (refererURL != null) {
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requestHeader.put(RequestHeader.REFERER, refererURL.toNormalform(true));
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}
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}
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requestHeader.put(HeaderFramework.ACCEPT, this.sb.getConfig("crawler.http.accept", DEFAULT_ACCEPT));
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requestHeader.put(HeaderFramework.ACCEPT_LANGUAGE,
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this.sb.getConfig("crawler.http.acceptLanguage", DEFAULT_LANGUAGE));
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requestHeader.put(HeaderFramework.ACCEPT_CHARSET,
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this.sb.getConfig("crawler.http.acceptCharset", DEFAULT_CHARSET));
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requestHeader.put(HeaderFramework.ACCEPT_ENCODING,
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this.sb.getConfig("crawler.http.acceptEncoding", DEFAULT_ENCODING));
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return requestHeader;
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}
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private Response load(final Request request, CrawlProfile profile, final int retryCount, final int maxFileSize, final BlacklistType blacklistType, final ClientIdentification.Agent agent) throws IOException {
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if (retryCount < 0) {
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this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.TEMPORARY_NETWORK_FAILURE, "retry counter exceeded", -1);
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throw new IOException("retry counter exceeded for URL " + request.url().toString() + ". Processing aborted.$");
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}
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DigestURL url = request.url();
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final String host = url.getHost();
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if (host == null || host.length() < 2) throw new IOException("host is not well-formed: '" + host + "'");
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final String path = url.getFile();
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int port = url.getPort();
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final boolean ssl = url.getProtocol().equals("https");
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if (port < 0) port = (ssl) ? 443 : 80;
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// check if url is in blacklist
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final String hostlow = host.toLowerCase();
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if (blacklistType != null && Switchboard.urlBlacklist.isListed(blacklistType, hostlow, path)) {
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this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.FINAL_LOAD_CONTEXT, "url in blacklist", -1);
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throw new IOException("CRAWLER Rejecting URL '" + request.url().toString() + "'. URL is in blacklist.$");
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}
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// resolve yacy and yacyh domains
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final AlternativeDomainNames yacyResolver = this.sb.peers;
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if(yacyResolver != null) {
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final String yAddress = yacyResolver.resolve(host);
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if(yAddress != null) {
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url = new DigestURL(url.getProtocol() + "://" + yAddress + path);
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}
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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 = createRequestheader(request, agent);
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// HTTP-Client
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final HTTPClient client = new HTTPClient(agent);
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client.setRedirecting(false); // we want to handle redirection ourselves, so we don't index pages twice
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client.setTimout(this.socketTimeout);
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client.setHeader(requestHeader.entrySet());
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// send request
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final byte[] responseBody = client.GETbytes(url, sb.getConfig(SwitchboardConstants.ADMIN_ACCOUNT_USER_NAME, "admin"), sb.getConfig(SwitchboardConstants.ADMIN_ACCOUNT_B64MD5, ""), maxFileSize, false);
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final int statusCode = client.getHttpResponse().getStatusLine().getStatusCode();
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final ResponseHeader responseHeader = new ResponseHeader(statusCode, client.getHttpResponse().getAllHeaders());
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String requestURLString = request.url().toNormalform(true);
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// check redirection
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if (statusCode > 299 && statusCode < 310) {
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final DigestURL redirectionUrl = extractRedirectURL(request, profile, url, client.getHttpResponse().getStatusLine(),
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responseHeader, requestURLString);
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if (this.sb.getConfigBool(SwitchboardConstants.CRAWLER_FOLLOW_REDIRECTS, true)) {
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// we have two use cases here: loading from a crawl or just loading the url. Check this:
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if (profile != null && !CrawlSwitchboard.DEFAULT_PROFILES.contains(profile.name())) {
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// put redirect url on the crawler queue to repeat a double-check
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/* We have to clone the request instance and not to modify directly its URL,
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* otherwise the stackCrawl() function would reject it, because detecting it as already in the activeWorkerEntries */
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Request redirectedRequest = new Request(request.initiator(),
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redirectionUrl,
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request.referrerhash(),
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request.name(),
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request.appdate(),
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request.profileHandle(),
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request.depth(),
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request.timezoneOffset());
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String rejectReason = this.sb.crawlStacker.stackCrawl(redirectedRequest);
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// in the end we must throw an exception (even if this is not an error, just to abort the current process
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if(rejectReason != null) {
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throw new IOException("CRAWLER Redirect of URL=" + requestURLString + " aborted. Reason : " + rejectReason);
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}
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throw new IOException("CRAWLER Redirect of URL=" + requestURLString + " to " + redirectionUrl.toNormalform(false) + " placed on crawler queue for double-check");
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}
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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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this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.FINAL_LOAD_CONTEXT, "server shutdown", statusCode);
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throw new IOException("CRAWLER Redirect of URL=" + requestURLString + " aborted because of server shutdown.$");
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}
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// retry crawling with new url
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request.redirectURL(redirectionUrl);
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return load(request, profile, retryCount - 1, maxFileSize, blacklistType, agent);
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}
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// we don't want to follow redirects
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this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.FINAL_PROCESS_CONTEXT, "redirection not wanted", statusCode);
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throw new IOException("REJECTED UNWANTED REDIRECTION '" + client.getHttpResponse().getStatusLine() + "' for URL '" + requestURLString + "'$");
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} else if (responseBody == null) {
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// no response, reject file
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this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.TEMPORARY_NETWORK_FAILURE, "no response body", statusCode);
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throw new IOException("REJECTED EMPTY RESPONSE BODY '" + client.getHttpResponse().getStatusLine() + "' for URL '" + requestURLString + "'$");
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} else if (statusCode == 200 || statusCode == 203) {
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// the transfer is ok
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// we write the new cache entry to file system directly
|
|
final long contentLength = responseBody.length;
|
|
ByteCount.addAccountCount(ByteCount.CRAWLER, contentLength);
|
|
|
|
// check length again in case it was not possible to get the length before loading
|
|
if (maxFileSize >= 0 && contentLength > maxFileSize) {
|
|
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.FINAL_PROCESS_CONTEXT, "file size limit exceeded", statusCode);
|
|
throw new IOException("REJECTED URL " + request.url() + " because file size '" + contentLength + "' exceeds max filesize limit of " + maxFileSize + " bytes. (GET)$");
|
|
}
|
|
|
|
// create a new cache entry
|
|
response = new Response(
|
|
request,
|
|
requestHeader,
|
|
responseHeader,
|
|
profile,
|
|
false,
|
|
responseBody
|
|
);
|
|
|
|
return response;
|
|
} else {
|
|
// if the response has not the right response type then reject file
|
|
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.TEMPORARY_NETWORK_FAILURE, "wrong http status code", statusCode);
|
|
throw new IOException("REJECTED WRONG STATUS TYPE '" + client.getHttpResponse().getStatusLine() + "' for URL '" + requestURLString + "'$");
|
|
}
|
|
}
|
|
|
|
public static Response load(final Request request, ClientIdentification.Agent agent) throws IOException {
|
|
return load(request, agent, 3);
|
|
}
|
|
|
|
private static Response load(final Request request, ClientIdentification.Agent agent, final int retryCount) throws IOException {
|
|
|
|
if (retryCount < 0) {
|
|
throw new IOException("Redirection counter exceeded for URL " + request.url().toString() + ". Processing aborted.");
|
|
}
|
|
|
|
final String host = request.url().getHost();
|
|
if (host == null || host.length() < 2) throw new IOException("host is not well-formed: '" + host + "'");
|
|
final String path = request.url().getFile();
|
|
int port = request.url().getPort();
|
|
final boolean ssl = request.url().getProtocol().equals("https");
|
|
if (port < 0) port = (ssl) ? 443 : 80;
|
|
|
|
// check if url is in blacklist
|
|
final String hostlow = host.toLowerCase();
|
|
if (Switchboard.urlBlacklist != null && Switchboard.urlBlacklist.isListed(BlacklistType.CRAWLER, hostlow, path)) {
|
|
throw new IOException("CRAWLER Rejecting URL '" + request.url().toString() + "'. URL is in blacklist.");
|
|
}
|
|
|
|
// take a file from the net
|
|
Response response = null;
|
|
|
|
// create a request header
|
|
final RequestHeader requestHeader = new RequestHeader();
|
|
requestHeader.put(HeaderFramework.USER_AGENT, agent.userAgent);
|
|
requestHeader.put(HeaderFramework.ACCEPT_LANGUAGE, DEFAULT_LANGUAGE);
|
|
requestHeader.put(HeaderFramework.ACCEPT_CHARSET, DEFAULT_CHARSET);
|
|
requestHeader.put(HeaderFramework.ACCEPT_ENCODING, DEFAULT_ENCODING);
|
|
|
|
final HTTPClient client = new HTTPClient(agent);
|
|
client.setTimout(20000);
|
|
client.setHeader(requestHeader.entrySet());
|
|
final byte[] responseBody = client.GETbytes(request.url(), null, null, false);
|
|
final int code = client.getHttpResponse().getStatusLine().getStatusCode();
|
|
final ResponseHeader header = new ResponseHeader(code, client.getHttpResponse().getAllHeaders());
|
|
// FIXME: 30*-handling (bottom) is never reached
|
|
// we always get the final content because httpClient.followRedirects = true
|
|
|
|
if (responseBody != null && (code == 200 || code == 203)) {
|
|
// the transfer is ok
|
|
|
|
//statistics:
|
|
ByteCount.addAccountCount(ByteCount.CRAWLER, responseBody.length);
|
|
|
|
// we write the new cache entry to file system directly
|
|
|
|
// create a new cache entry
|
|
response = new Response(
|
|
request,
|
|
requestHeader,
|
|
header,
|
|
null,
|
|
false,
|
|
responseBody
|
|
);
|
|
|
|
return response;
|
|
} else if (code > 299 && code < 310) {
|
|
if (header.containsKey(HeaderFramework.LOCATION)) {
|
|
// getting redirection URL
|
|
String redirectionUrlString = header.get(HeaderFramework.LOCATION);
|
|
redirectionUrlString = redirectionUrlString.trim();
|
|
|
|
if (redirectionUrlString.isEmpty()) {
|
|
throw new IOException("CRAWLER Redirection of URL=" + request.url().toString() + " aborted. Location header is empty.");
|
|
}
|
|
|
|
// normalizing URL
|
|
final DigestURL redirectionUrl = DigestURL.newURL(request.url(), redirectionUrlString);
|
|
|
|
|
|
// if we are already doing a shutdown we don't need to retry crawling
|
|
if (Thread.currentThread().isInterrupted()) {
|
|
throw new IOException("CRAWLER Retry of URL=" + request.url().toString() + " aborted because of server shutdown.");
|
|
}
|
|
|
|
// retry crawling with new url
|
|
request.redirectURL(redirectionUrl);
|
|
return load(request, agent, retryCount - 1);
|
|
}
|
|
} else {
|
|
// if the response has not the right response type then reject file
|
|
throw new IOException("REJECTED WRONG STATUS TYPE '" + client.getHttpResponse().getStatusLine() + "' for URL " + request.url().toString());
|
|
}
|
|
return response;
|
|
}
|
|
|
|
}
|