mirror of
https://github.com/yacy/yacy_search_server.git
synced 2024-09-21 00:00:13 +02:00
aaedc0405d
- Rewrote usage of HashMap/Map to concurrent versions (to avoid a CME=ConcurrentModificationException) - Rewrote ConnectionInfo (as an example) to use a synchronized iterator instead of synchronizing an already synced HashSet (see Collections call) - This avoids catching CMEs again - Commented out noisy ConcurrentLog.logException() call Conflicts: source/net/yacy/repository/LoaderDispatcher.java
457 lines
22 KiB
Java
457 lines
22 KiB
Java
// LoaderDispatcher.java
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// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 24.10.2007 on http://yacy.net
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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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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// LICENSE
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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.repository;
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import java.io.File;
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import java.io.IOException;
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import java.net.MalformedURLException;
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import java.util.Arrays;
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import java.util.Date;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.TimeUnit;
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import net.yacy.cora.document.ASCII;
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import net.yacy.cora.document.UTF8;
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import net.yacy.cora.federate.yacy.CacheStrategy;
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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.util.ConcurrentLog;
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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.ZURL.FailCategory;
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import net.yacy.crawler.retrieval.FTPLoader;
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import net.yacy.crawler.retrieval.FileLoader;
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import net.yacy.crawler.retrieval.HTTPLoader;
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import net.yacy.crawler.retrieval.Request;
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import net.yacy.crawler.retrieval.Response;
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import net.yacy.crawler.retrieval.SMBLoader;
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import net.yacy.document.Document;
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import net.yacy.document.Parser;
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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.util.FileUtils;
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import net.yacy.repository.Blacklist.BlacklistType;
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import net.yacy.search.Switchboard;
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public final class LoaderDispatcher {
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private final static int accessTimeMaxsize = 1000;
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private static final ConcurrentHashMap<String, Long> accessTime = new ConcurrentHashMap<String, Long>(); // to protect targets from DDoS
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private final Switchboard sb;
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private final HashSet<String> supportedProtocols;
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private final HTTPLoader httpLoader;
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private final FTPLoader ftpLoader;
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private final SMBLoader smbLoader;
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private final FileLoader fileLoader;
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private final ConcurrentHashMap<DigestURI, Semaphore> loaderSteering; // a map that delivers a 'finish' semaphore for urls
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private final ConcurrentLog log;
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public LoaderDispatcher(final Switchboard sb) {
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this.sb = sb;
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this.supportedProtocols = new HashSet<String>(Arrays.asList(new String[]{"http","https","ftp","smb","file"}));
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// initiate loader objects
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this.log = new ConcurrentLog("LOADER");
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this.httpLoader = new HTTPLoader(sb, this.log);
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this.ftpLoader = new FTPLoader(sb, this.log);
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this.smbLoader = new SMBLoader(sb, this.log);
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this.fileLoader = new FileLoader(sb, this.log);
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this.loaderSteering = new ConcurrentHashMap<DigestURI, Semaphore>();
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}
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public boolean isSupportedProtocol(final String protocol) {
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if ((protocol == null) || (protocol.isEmpty())) return false;
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return this.supportedProtocols.contains(protocol.trim().toLowerCase());
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}
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@SuppressWarnings("unchecked")
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public HashSet<String> getSupportedProtocols() {
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return (HashSet<String>) this.supportedProtocols.clone();
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}
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/**
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* generate a request object
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* @param url the target url
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* @param forText shows that this was a for-text crawling request
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* @param global shows that this was a global crawling request
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* @return the request object
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*/
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public Request request(
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final DigestURI url,
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final boolean forText,
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final boolean global
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) {
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return new Request(
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ASCII.getBytes(this.sb.peers.mySeed().hash),
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url,
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null,
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"",
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new Date(),
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(forText) ?
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((global) ?
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this.sb.crawler.defaultTextSnippetGlobalProfile.handle() :
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this.sb.crawler.defaultTextSnippetLocalProfile.handle())
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:
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((global) ?
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this.sb.crawler.defaultMediaSnippetGlobalProfile.handle() :
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this.sb.crawler.defaultMediaSnippetLocalProfile.handle()), // crawl profile
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0,
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0,
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0,
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0);
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}
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public void load(final DigestURI url, final CacheStrategy cacheStratgy, final int maxFileSize, final File targetFile, BlacklistType blacklistType, final long minDelay, int timeout) throws IOException {
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final byte[] b = load(request(url, false, true), cacheStratgy, maxFileSize, blacklistType, minDelay, timeout).getContent();
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if (b == null) throw new IOException("load == null");
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final File tmp = new File(targetFile.getAbsolutePath() + ".tmp");
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// transaction-safe writing
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final File parent = targetFile.getParentFile();
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if (!parent.exists()) parent.mkdirs();
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FileUtils.copy(b, tmp);
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tmp.renameTo(targetFile);
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}
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public Response load(final Request request, final CacheStrategy cacheStrategy, final BlacklistType blacklistType, final long minDelay, int timeout) throws IOException {
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return load(request, cacheStrategy, protocolMaxFileSize(request.url()), blacklistType, minDelay, timeout);
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}
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public Response load(final Request request, final CacheStrategy cacheStrategy, final int maxFileSize, final BlacklistType blacklistType, final long minDelay, int timeout) throws IOException {
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Semaphore check = this.loaderSteering.get(request.url());
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if (check != null) {
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// a loading process may be going on for that url
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try { check.tryAcquire(5, TimeUnit.SECONDS);} catch (final InterruptedException e) {}
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// now the process may have terminated and we run a normal loading
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// which may be successful faster because of a cache hit
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}
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this.loaderSteering.put(request.url(), new Semaphore(0));
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try {
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final Response response = loadInternal(request, cacheStrategy, maxFileSize, blacklistType, minDelay, timeout);
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check = this.loaderSteering.remove(request.url());
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if (check != null) check.release(1000);
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return response;
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} catch (final IOException e) {
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// release the semaphore anyway
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check = this.loaderSteering.remove(request.url());
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if (check != null) check.release(1000);
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// Very noisy: ConcurrentLog.logException(e);
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throw new IOException(e);
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}
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}
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/**
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* load a resource from the web, from ftp, from smb or a file
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* @param request the request essentials
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* @param cacheStratgy strategy according to NOCACHE, IFFRESH, IFEXIST, CACHEONLY
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* @return the loaded entity in a Response object
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* @throws IOException
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*/
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private Response loadInternal(final Request request, CacheStrategy cacheStrategy, final int maxFileSize, final BlacklistType blacklistType, final long minDelay, int timeout) throws IOException {
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// get the protocol of the next URL
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final DigestURI url = request.url();
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if (url.isFile() || url.isSMB()) cacheStrategy = CacheStrategy.NOCACHE; // load just from the file system
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final String protocol = url.getProtocol();
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final String host = url.getHost();
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final CrawlProfile crawlProfile = request.profileHandle() == null ? null : this.sb.crawler.getActive(UTF8.getBytes(request.profileHandle()));
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// check if url is in blacklist
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if (blacklistType != null && host != null && Switchboard.urlBlacklist.isListed(blacklistType, host.toLowerCase(), url.getFile())) {
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this.sb.crawlQueues.errorURL.push(request, crawlProfile, this.sb.peers.mySeed().hash.getBytes(), new Date(), 1, FailCategory.FINAL_LOAD_CONTEXT, "url in blacklist", -1);
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throw new IOException("DISPATCHER Rejecting URL '" + request.url().toString() + "'. URL is in blacklist.");
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}
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// check if we have the page in the cache
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if (cacheStrategy != CacheStrategy.NOCACHE && crawlProfile != null) {
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// we have passed a first test if caching is allowed
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// now see if there is a cache entry
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final ResponseHeader cachedResponse = (url.isLocal()) ? null : Cache.getResponseHeader(url.hash());
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if (cachedResponse != null && Cache.hasContent(url.hash())) {
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// yes we have the content
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// create request header values and a response object because we need that
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// in case that we want to return the cached content in the next step
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final RequestHeader requestHeader = new RequestHeader();
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requestHeader.put(HeaderFramework.USER_AGENT, ClientIdentification.getUserAgent());
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DigestURI refererURL = null;
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if (request.referrerhash() != null) refererURL = this.sb.getURL(request.referrerhash());
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if (refererURL != null) requestHeader.put(RequestHeader.REFERER, refererURL.toNormalform(true));
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final Response response = new Response(
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request,
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requestHeader,
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cachedResponse,
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crawlProfile,
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true,
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null);
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// check which caching strategy shall be used
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if (cacheStrategy == CacheStrategy.IFEXIST || cacheStrategy == CacheStrategy.CACHEONLY) {
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// well, just take the cache and don't care about freshness of the content
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final byte[] content = Cache.getContent(url.hash());
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if (content != null) {
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this.log.info("cache hit/useall for: " + url.toNormalform(true));
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response.setContent(content);
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return response;
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}
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}
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// now the cacheStrategy must be CACHE_STRATEGY_IFFRESH, that means we should do a proxy freshness test
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//assert cacheStrategy == CacheStrategy.IFFRESH : "cacheStrategy = " + cacheStrategy;
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if (response.isFreshForProxy()) {
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final byte[] content = Cache.getContent(url.hash());
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if (content != null) {
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this.log.info("cache hit/fresh for: " + url.toNormalform(true));
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response.setContent(content);
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return response;
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}
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}
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this.log.info("cache hit/stale for: " + url.toNormalform(true));
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} else if (cachedResponse != null) {
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this.log.warn("HTCACHE contained response header, but not content for url " + url.toNormalform(true));
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}
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}
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// check case where we want results from the cache exclusively, and never from the internet (offline mode)
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if (cacheStrategy == CacheStrategy.CACHEONLY) {
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// we had a chance to get the content from the cache .. its over. We don't have it.
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throw new IOException("cache only strategy");
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}
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// now forget about the cache, nothing there. Try to load the content from the internet
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// check access time: this is a double-check (we checked possibly already in the balancer)
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// to make sure that we don't DoS the target by mistake
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if (!url.isLocal()) {
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final Long lastAccess = accessTime.get(host);
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long wait = 0;
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if (lastAccess != null) wait = Math.max(0, minDelay + lastAccess.longValue() - System.currentTimeMillis());
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if (wait > 0) {
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// force a sleep here. Instead just sleep we clean up the accessTime map
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final long untilTime = System.currentTimeMillis() + wait;
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cleanupAccessTimeTable(untilTime);
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if (System.currentTimeMillis() < untilTime) {
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long frcdslp = untilTime - System.currentTimeMillis();
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this.log.info("Forcing sleep of " + frcdslp + " ms for host " + host);
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try {Thread.sleep(frcdslp);} catch (final InterruptedException ee) {}
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}
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}
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}
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// now it's for sure that we will access the target. Remember the access time
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if (host != null) {
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if (accessTime.size() > accessTimeMaxsize) accessTime.clear(); // prevent a memory leak here
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accessTime.put(host, System.currentTimeMillis());
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}
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// load resource from the internet
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Response response = null;
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if (protocol.equals("http") || protocol.equals("https")) {
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response = this.httpLoader.load(request, crawlProfile, maxFileSize, blacklistType, timeout);
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} else if (protocol.equals("ftp")) {
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response = this.ftpLoader.load(request, true);
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} else if (protocol.equals("smb")) {
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response = this.smbLoader.load(request, true);
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} else if (protocol.equals("file")) {
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response = this.fileLoader.load(request, true);
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} else {
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throw new IOException("Unsupported protocol '" + protocol + "' in url " + url);
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}
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if (response == null) {
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throw new IOException("no response (NULL) for url " + url);
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}
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if (response.getContent() == null) {
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throw new IOException("empty response (code " + response.getStatus() + ") for url " + url);
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}
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// we got something. Now check if we want to store that to the cache
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// first check looks if we want to store the content to the cache
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if (crawlProfile == null || !crawlProfile.storeHTCache()) {
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// no caching wanted. Thats ok, do not write any message
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return response;
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}
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// second check tells us if the protocoll tells us something about caching
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final String storeError = response.shallStoreCacheForCrawler();
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if (storeError == null) {
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try {
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Cache.store(url, response.getResponseHeader(), response.getContent());
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} catch (final IOException e) {
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this.log.warn("cannot write " + response.url() + " to Cache (3): " + e.getMessage(), e);
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}
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} else {
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this.log.warn("cannot write " + response.url() + " to Cache (4): " + storeError);
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}
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return response;
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}
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private int protocolMaxFileSize(final DigestURI url) {
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if (url.isHTTP() || url.isHTTPS())
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return this.sb.getConfigInt("crawler.http.maxFileSize", HTTPLoader.DEFAULT_MAXFILESIZE);
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if (url.isFTP())
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return this.sb.getConfigInt("crawler.ftp.maxFileSize", (int) FTPLoader.DEFAULT_MAXFILESIZE);
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if (url.isSMB())
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return this.sb.getConfigInt("crawler.smb.maxFileSize", (int) SMBLoader.DEFAULT_MAXFILESIZE);
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return Integer.MAX_VALUE;
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}
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/**
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* load the url as byte[] content from the web or the cache
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* @param request
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* @param cacheStrategy
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* @param timeout
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* @return the content as {@link byte[]}
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* @throws IOException
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*/
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public byte[] loadContent(final Request request, final CacheStrategy cacheStrategy, BlacklistType blacklistType, final long minDelay, int timeout) throws IOException {
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// try to download the resource using the loader
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final Response entry = load(request, cacheStrategy, blacklistType, minDelay, timeout);
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if (entry == null) return null; // not found in web
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// read resource body (if it is there)
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return entry.getContent();
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}
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public Document[] loadDocuments(final Request request, final CacheStrategy cacheStrategy, final int maxFileSize, BlacklistType blacklistType, final long minDelay, int timeout) throws IOException, Parser.Failure {
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// load resource
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final Response response = load(request, cacheStrategy, maxFileSize, blacklistType, minDelay, timeout);
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final DigestURI url = request.url();
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if (response == null) throw new IOException("no Response for url " + url);
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// if it is still not available, report an error
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if (response.getContent() == null || response.getResponseHeader() == null) throw new IOException("no Content available for url " + url);
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// parse resource
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return response.parse();
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}
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public Document loadDocument(final DigestURI location, final CacheStrategy cachePolicy, BlacklistType blacklistType, final long minDelay, int timeout) throws IOException {
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// load resource
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Request request = request(location, true, false);
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final Response response = this.load(request, cachePolicy, blacklistType, minDelay, timeout);
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final DigestURI url = request.url();
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if (response == null) throw new IOException("no Response for url " + url);
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// if it is still not available, report an error
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if (response.getContent() == null || response.getResponseHeader() == null) throw new IOException("no Content available for url " + url);
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// parse resource
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try {
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Document[] documents = response.parse();
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return Document.mergeDocuments(location, response.getMimeType(), documents);
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} catch(final Parser.Failure e) {
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throw new IOException(e.getMessage());
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}
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}
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/**
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* load all links from a resource
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* @param url the url that shall be loaded
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* @param cacheStrategy the cache strategy
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* @return a map from URLs to the anchor texts of the urls
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* @throws IOException
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*/
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public final Map<DigestURI, String> loadLinks(final DigestURI url, final CacheStrategy cacheStrategy, BlacklistType blacklistType, final long minDelay, int timeout) throws IOException {
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final Response response = load(request(url, true, false), cacheStrategy, Integer.MAX_VALUE, blacklistType, minDelay, timeout);
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if (response == null) throw new IOException("response == null");
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final ResponseHeader responseHeader = response.getResponseHeader();
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if (response.getContent() == null) throw new IOException("resource == null");
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if (responseHeader == null) throw new IOException("responseHeader == null");
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Document[] documents = null;
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final String supportError = TextParser.supports(url, responseHeader.mime());
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if (supportError != null) throw new IOException("no parser support: " + supportError);
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try {
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documents = TextParser.parseSource(url, responseHeader.mime(), responseHeader.getCharacterEncoding(), response.getContent());
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if (documents == null) throw new IOException("document == null");
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} catch (final Exception e) {
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throw new IOException("parser error: " + e.getMessage());
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}
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return Document.getHyperlinks(documents);
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}
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public synchronized static void cleanupAccessTimeTable(final long timeout) {
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final Iterator<Map.Entry<String, Long>> i = accessTime.entrySet().iterator();
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Map.Entry<String, Long> e;
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while (i.hasNext()) {
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e = i.next();
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if (System.currentTimeMillis() > timeout) break;
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if (System.currentTimeMillis() - e.getValue().longValue() > 1000) i.remove();
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}
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}
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public void loadIfNotExistBackground(final DigestURI url, final File cache, final int maxFileSize, BlacklistType blacklistType, final long minDelay, final int timeout) {
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new Loader(url, cache, maxFileSize, CacheStrategy.IFEXIST, blacklistType, minDelay, timeout).start();
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}
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public void loadIfNotExistBackground(final DigestURI url, final int maxFileSize, BlacklistType blacklistType, final long minDelay, int timeout) {
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new Loader(url, null, maxFileSize, CacheStrategy.IFEXIST, blacklistType, minDelay, timeout).start();
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}
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private class Loader extends Thread {
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private final DigestURI url;
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private final File cache;
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private final int maxFileSize;
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private final CacheStrategy cacheStrategy;
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private final BlacklistType blacklistType;
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private final long minDelay;
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private final int timeout;
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public Loader(final DigestURI url, final File cache, final int maxFileSize, final CacheStrategy cacheStrategy, BlacklistType blacklistType, final long minDelay, final int timeout) {
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this.url = url;
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this.cache = cache;
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this.maxFileSize = maxFileSize;
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this.cacheStrategy = cacheStrategy;
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this.blacklistType = blacklistType;
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this.minDelay = minDelay;
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this.timeout = timeout;
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}
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@Override
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public void run() {
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if (this.cache != null && this.cache.exists()) return;
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try {
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// load from the net
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final Response response = load(request(this.url, false, true), this.cacheStrategy, this.maxFileSize, this.blacklistType, this.minDelay, this.timeout);
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final byte[] b = response.getContent();
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if (this.cache != null) FileUtils.copy(b, this.cache);
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} catch (final MalformedURLException e) {} catch (final IOException e) {}
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}
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|
}
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|
}
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