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a31b9097a4
two main changes must be implemented to enable mass remote crawls: - shift control of robots.txt to crawl queue (away from stacker). This is necessary since remote crawls can contain unchecked urls. Each peer must check the robots to prevent that it is misused as crawl agent for unwanted file retrieval - implement new index files that control double-check of remotely crawled urls After removal of robots.txt checking from stacker threads, the multi-threading of this process is void. Multithreading has been removed. Also the thread pools for the crawl threads had been removed, since creation of these threads is not resource-consuming, for a detailed explanation see svn 4106 git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4181 6c8d7289-2bf4-0310-a012-ef5d649a1542
285 lines
14 KiB
Java
285 lines
14 KiB
Java
// crawlOrder.java
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// -----------------------
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// part of the AnomicHTTPD caching proxy
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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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//
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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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//
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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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// You must compile this file with
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// javac -classpath .:../classes crawlOrder.java
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import java.net.MalformedURLException;
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import java.util.ArrayList;
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import java.util.Date;
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import de.anomic.http.httpHeader;
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import de.anomic.index.indexURLEntry;
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import de.anomic.plasma.plasmaSwitchboard;
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import de.anomic.server.serverObjects;
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import de.anomic.server.serverSwitch;
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import de.anomic.tools.crypt;
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import de.anomic.yacy.yacyCore;
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import de.anomic.yacy.yacyNetwork;
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import de.anomic.yacy.yacySeed;
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import de.anomic.yacy.yacyURL;
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public final class crawlOrder {
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public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch env) {
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// return variable that accumulates replacements
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plasmaSwitchboard switchboard = (plasmaSwitchboard) env;
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serverObjects prop = new serverObjects();
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if ((post == null) || (env == null)) return prop;
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if (!yacyNetwork.authentifyRequest(post, env)) return prop;
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//int proxyPrefetchDepth = Integer.parseInt(env.getConfig("proxyPrefetchDepth", "0"));
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//int crawlingdepth = Integer.parseInt(env.getConfig("crawlingDepth", "0"));
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// request values
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String iam = post.get("iam", ""); // seed hash of requester
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String youare = post.get("youare", ""); // seed hash of the target peer, needed for network stability
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String process = post.get("process", ""); // process type
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String key = post.get("key", ""); // transmission key
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int orderDepth = post.getInt("depth", 0); // crawl depth
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// response values
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/*
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the result can have one of the following values:
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negative cases, no retry
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denied - the peer does not want to crawl that
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exception - an exception occurred
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negative case, retry possible
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rejected - the peer has rejected to process, but a re-try should be possible
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positive case with crawling
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stacked - the resource is processed asap
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positive case without crawling
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double - the resource is already in database, believed to be fresh and not reloaded
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the resource is also returned in lurl
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*/
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String response = "denied";
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String reason = "false-input";
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String delay = "5";
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String lurl = "";
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boolean granted = switchboard.getConfigBool("crawlResponse", false);
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int acceptDepth = Integer.parseInt(switchboard.getConfig("crawlResponseDepth", "0"));
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int ppm = yacyCore.seedDB.mySeed().getPPM();
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int acceptDelay = (ppm == 0) ? 10 : (2 + 60 / yacyCore.seedDB.mySeed().getPPM());
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if (orderDepth > acceptDepth) orderDepth = acceptDepth;
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// check if requester is authorized
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if ((yacyCore.seedDB.mySeed() == null) || (!(yacyCore.seedDB.mySeed().hash.equals(youare)))) {
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// this request has a wrong target
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response = "denied";
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reason = "authentify-problem";
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delay = "3600"; // may request one hour later again
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} else if ((switchboard.isRobinsonMode()) && (!switchboard.isInMyCluster(iam))) {
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// check network environment, if we are a robinson peer or in a robinson cluster
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// then the request must come from a peer that is in the same cluster as we are
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reason = "not in my cluster";
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response = "denied";
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delay = "9999";
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} else if (orderDepth > 0) {
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response = "denied";
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reason = "order depth must be 0";
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delay = "3600"; // may request one hour later again
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} else if (!(granted)) {
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response = "denied";
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reason = "not granted to remote crawl";
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delay = "3600"; // may request one hour later again
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} else try {
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yacySeed requester = yacyCore.seedDB.getConnected(iam);
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int queuesize = switchboard.crawlQueues.coreCrawlJobSize() + switchboard.crawlQueues.limitCrawlTriggerJobSize() + switchboard.crawlQueues.remoteTriggeredCrawlJobSize() + switchboard.queueSize();
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if (requester == null) {
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response = "denied";
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reason = "unknown-client";
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delay = "240";
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} else if (!((requester.isSenior()) || (requester.isPrincipal()))) {
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response = "denied";
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reason = "not-qualified";
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delay = "240";
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} else if (queuesize > 100) {
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response = "rejected";
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reason = "busy";
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delay = Integer.toString(30 + queuesize * acceptDelay);
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} else if (!(process.equals("crawl"))) {
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response = "denied";
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reason = "unknown-order";
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delay = "9999";
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} else {
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// read the urls/referrer-vector
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ArrayList urlv = new ArrayList();
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ArrayList refv = new ArrayList();
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String refencoded = post.get("referrer", null);
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String urlencoded = post.get("url", null);
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if (urlencoded != null) {
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// old method: only one url
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urlv.add(crypt.simpleDecode(urlencoded, key)); // the url string to crawl
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} else {
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// new method: read a vector of urls
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while ((urlencoded = post.get("url" + urlv.size(), null)) != null) {
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urlv.add(crypt.simpleDecode(urlencoded, key));
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}
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}
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if (refencoded != null) {
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// old method: only one url
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env.getLog().logFinest("crawlOrder: refencoded=" + refencoded + " key=" + key);
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refv.add(crypt.simpleDecode(refencoded, key)); // the referrer url
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} else {
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// new method: read a vector of urls
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while ((refencoded = post.get("ref" + refv.size(), null)) != null) {
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env.getLog().logFinest("crawlOrder: refencoded=" + refencoded + " key=" + key);
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refv.add(crypt.simpleDecode(refencoded, key));
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}
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}
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// stack the urls
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Object[] stackresult;
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int count = Math.min(urlv.size(), refv.size());
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if (count == 1) {
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// old method: only one url
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// normalizing URL
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yacyURL url = new yacyURL((String) urlv.get(0), null);
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String newURL = url.toNormalform(true, true);
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if (!newURL.equals(urlv.get(0))) {
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env.getLog().logWarning("crawlOrder: Received not normalized URL " + urlv.get(0));
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}
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String refURL = (refv.get(0) == null) ? null : new yacyURL((String) refv.get(0), null).toNormalform(true, true);
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if ((refURL != null) && (!refURL.equals(refv.get(0)))) {
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env.getLog().logWarning("crawlOrder: Received not normalized Referer URL " + refv.get(0) + " of URL " + urlv.get(0));
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}
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if (!switchboard.acceptURL(new yacyURL(newURL, null))) {
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env.getLog().logWarning("crawlOrder: Received URL outside of our domain: " + newURL);
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return null;
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}
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// adding URL to noticeURL Queue
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env.getLog().logFinest("crawlOrder: a: url='" + newURL + "'");
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stackresult = stack(switchboard, url, refURL, iam, youare);
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response = (String) stackresult[0];
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reason = (String) stackresult[1];
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lurl = (String) stackresult[2];
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delay = (response.equals("stacked")) ? Integer.toString(5 + acceptDelay) : "1"; // this value needs to be calculated individually
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} else {
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// new method: several urls
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int stackCount = 0;
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//int doubleCount = 0;
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//int rejectedCount = 0;
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for (int i = 0; i < count; i++) {
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env.getLog().logFinest("crawlOrder: b: url='" + (String) urlv.get(i) + "'");
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try {
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stackresult = stack(switchboard, new yacyURL((String) urlv.get(i), null), (String) refv.get(i), iam, youare);
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response = (String) stackresult[0];
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prop.put("list_" + i + "_job", (String) stackresult[0] + "," + (String) stackresult[1]);
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prop.put("list_" + i + "_lurl", (String) stackresult[2]);
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prop.put("list_" + i + "_count", i);
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} catch (MalformedURLException e) {}
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}
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prop.put("list", count);
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response = "enqueued";
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reason = "ok";
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lurl = "";
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delay = Integer.toString(stackCount * acceptDelay + 1);
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}
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}
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} catch (Exception e) {
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// mist
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reason = "ERROR: " + e.getMessage();
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env.getLog().logSevere("crawlOrder: " + reason, e);
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delay = "600";
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}
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prop.put("response", response);
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prop.put("reason", reason);
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prop.put("delay", delay);
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prop.put("depth", acceptDepth);
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prop.put("lurl", lurl);
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prop.put("forward", "");
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prop.put("key", key);
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// return rewrite properties
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return prop;
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}
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private static Object[] stack(plasmaSwitchboard switchboard, yacyURL url, String referrer, String iam, String youare) {
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String response, reason, lurl;
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// stack url
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switchboard.getLog().logFinest("crawlOrder: stack: url='" + url + "'");
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String reasonString = null;
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try {
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reasonString = switchboard.crawlStacker.stackCrawl(url, referrer, iam, "REMOTE-CRAWLING", new Date(), 0, switchboard.defaultRemoteProfile);
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} catch (InterruptedException e) {
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reasonString = "Shutdown in progress";
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}
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if (reasonString == null) {
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// liftoff!
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response = "stacked";
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reason = "ok";
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lurl = "";
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} else if (reasonString.startsWith("double")) {
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// case where we have already the url loaded;
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reason = reasonString;
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// send lurl-Entry as response
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indexURLEntry entry;
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entry = switchboard.wordIndex.loadedURL.load(url.hash(), null);
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if (entry == null) {
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response = "rejected";
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lurl = "";
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} else {
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response = "double";
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switchboard.wordIndex.loadedURL.notifyGCrawl(entry.hash(), iam, youare);
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lurl = crypt.simpleEncode(entry.toString());
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}
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} else {
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response = "rejected";
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reason = reasonString;
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lurl = "";
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}
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return new Object[]{response, reason, lurl};
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}
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}
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