mirror of
https://github.com/yacy/yacy_search_server.git
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c0807abd33
git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@18 6c8d7289-2bf4-0310-a012-ef5d649a1542
260 lines
11 KiB
Java
260 lines
11 KiB
Java
// plasmaCrawlerLoader.java
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// ------------------------
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// part of YaCy
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004
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// last major change: 25.02.2004
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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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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.plasma;
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import java.io.*;
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import java.util.*;
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import java.net.*;
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import de.anomic.net.*;
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import de.anomic.http.*;
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import de.anomic.server.*;
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import de.anomic.tools.*;
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import de.anomic.htmlFilter.*;
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public class plasmaCrawlLoader {
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private plasmaHTCache cacheManager;
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private int socketTimeout;
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private int loadTimeout;
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private boolean remoteProxyUse;
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private String remoteProxyHost;
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private int remoteProxyPort;
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private int maxSlots;
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private List slots;
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private serverLog log;
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private HashSet acceptMimeTypes;
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public plasmaCrawlLoader(plasmaHTCache cacheManager, serverLog log, int socketTimeout, int loadTimeout, int mslots, boolean proxyUse, String proxyHost, int proxyPort,
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HashSet acceptMimeTypes) {
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this.cacheManager = cacheManager;
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this.log = log;
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this.socketTimeout = socketTimeout;
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this.loadTimeout = loadTimeout;
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this.remoteProxyUse = proxyUse;
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this.remoteProxyHost = proxyHost;
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this.remoteProxyPort = proxyPort;
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this.maxSlots = mslots;
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this.slots = new LinkedList();
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this.acceptMimeTypes = acceptMimeTypes;
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}
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private void killTimeouts() {
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Exec thread;
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for (int i = slots.size() - 1; i >= 0; i--) {
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// check if thread is alive
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thread = (Exec) slots.get(i);
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if (thread.isAlive()) {
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// check the age of the thread
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if (System.currentTimeMillis() - thread.startdate > loadTimeout) {
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// we kill that thread
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thread.interrupt(); // hopefully this wakes him up.
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slots.remove(i);
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log.logDebug("IGNORING SLEEPING DOWNLOAD SLOT " + thread.url.toString());
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}
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} else {
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// thread i is dead, remove it
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slots.remove(i);
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}
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}
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}
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public synchronized void loadParallel(URL url, String referer, String initiator, int depth, plasmaCrawlProfile.entry profile) {
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// wait until there is space in the download slots
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Exec thread;
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while (slots.size() >= maxSlots) {
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killTimeouts();
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// wait a while
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try {
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Thread.currentThread().sleep(1000);
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} catch (InterruptedException e) {
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break;
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}
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}
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// we found space in the download slots
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thread = new Exec(url, referer, initiator, depth, profile);
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thread.start();
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slots.add(thread);
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}
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public int size() {
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killTimeouts();
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return slots.size();
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}
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public Exec[] threadStatus() {
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killTimeouts();
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Exec[] result = new Exec[slots.size()];
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for (int i = 0; i < slots.size(); i++) result[i] = (Exec) slots.get(i);
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return result;
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}
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public class Exec extends Thread {
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public URL url;
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public String referer;
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public String initiator;
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public int depth;
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public long startdate;
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public plasmaCrawlProfile.entry profile;
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public String error;
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public Exec(URL url, String referer, String initiator, int depth, plasmaCrawlProfile.entry profile) {
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this.url = url; // the url to crawl
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this.referer = referer; // the url that contained this url as link
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this.initiator = initiator;
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this.depth = depth; // distance from start-url
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this.startdate = System.currentTimeMillis();
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this.profile = profile;
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this.error = null;
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}
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public void run() {
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try {
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load(url, referer, initiator, depth, profile);
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} catch (IOException e) {
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}
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}
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private httpc newhttpc(String server, int port, boolean ssl) throws IOException {
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// a new httpc connection, combined with possible remote proxy
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if (remoteProxyUse)
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return new httpc(server, port, socketTimeout, ssl, remoteProxyHost, remoteProxyPort);
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else
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return new httpc(server, port, socketTimeout, ssl);
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}
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private void load(URL url, String referer, String initiator, int depth, plasmaCrawlProfile.entry profile) throws IOException {
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if (url == null) return;
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Date requestDate = new Date(); // remember the time...
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String host = url.getHost();
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String path = url.getPath();
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int port = url.getPort();
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boolean ssl = url.getProtocol().equals("https");
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if (port < 0) port = (ssl) ? 443 : 80;
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// set referrer; in some case advertise a little bit:
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referer = referer.trim();
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if (referer.length() == 0) referer = "http://www.yacy.net/yacy/";
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// take a file from the net
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try {
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// create a request header
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httpHeader requestHeader = new httpHeader();
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requestHeader.put("User-Agent", httpdProxyHandler.userAgent);
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requestHeader.put("Referer", referer);
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requestHeader.put("Accept-Encoding", "gzip,deflate");
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//System.out.println("CRAWLER_REQUEST_HEADER=" + requestHeader.toString()); // DEBUG
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// open the connection
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httpc remote = newhttpc(host, port, ssl);
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// send request
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httpc.response res = remote.GET(path, requestHeader);
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if (res.status.startsWith("200")) {
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// the transfer is ok
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long contentLength = res.responseHeader.contentLength();
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// reserve cache entry
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plasmaHTCache.Entry htCache = cacheManager.newEntry(requestDate, depth, url, requestHeader, res.status, res.responseHeader, initiator, profile);
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// request has been placed and result has been returned. work off response
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File cacheFile = cacheManager.getCachePath(url);
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try {
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if (!(httpd.isTextMime(res.responseHeader.mime().toLowerCase(), acceptMimeTypes))) {
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// if the response has not the right file type then reject file
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remote.close();
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log.logInfo("REJECTED WRONG MIME TYPE " + res.responseHeader.mime() + " for url " + url.toString());
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htCache.status = plasmaHTCache.CACHE_UNFILLED;
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} else if ((profile.storeHTCache()) && ((error = htCache.shallStoreCache()) == null)) {
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// we write the new cache entry to file system directly
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cacheFile.getParentFile().mkdirs();
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FileOutputStream fos = new FileOutputStream(cacheFile);
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htCache.cacheArray = res.writeContent(fos); // writes in cacheArray and cache file
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fos.close();
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htCache.status = plasmaHTCache.CACHE_FILL;
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} else {
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if (error != null) log.logDebug("CRAWLER NOT STORED RESOURCE " + url.toString() + ": " + error);
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// anyway, the content still lives in the content scraper
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htCache.cacheArray = res.writeContent(null); // writes only into cacheArray
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htCache.status = plasmaHTCache.CACHE_PASSING;
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}
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// enQueue new entry with response header
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if ((initiator == null) || (initiator.length() == 0)) {
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// enqueued for proxy writings
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cacheManager.stackProcess(htCache);
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} else {
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// direct processing for crawling
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cacheManager.process(htCache);
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}
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} catch (SocketException e) {
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// this may happen if the client suddenly closes its connection
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// maybe the user has stopped loading
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// in that case, we are not responsible and just forget it
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// but we clean the cache also, since it may be only partial
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// and most possible corrupted
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if (cacheFile.exists()) cacheFile.delete();
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log.logError("CRAWLER LOADER ERROR1: with url=" + url.toString() + ": " + e.toString());
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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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log.logInfo("REJECTED WRONG STATUS TYPE '" + res.status + "' for url " + url.toString());
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// not processed any further
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}
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remote.close();
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} catch (Exception e) {
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// this may happen if the targeted host does not exist or anything with the
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// remote server was wrong.
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log.logError("CRAWLER LOADER ERROR2 with url=" + url.toString() + ": " + e.toString());
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e.printStackTrace();
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}
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}
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}
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}
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