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https://github.com/yacy/yacy_search_server.git
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497428c8ec
git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@2949 6c8d7289-2bf4-0310-a012-ef5d649a1542
270 lines
13 KiB
Java
270 lines
13 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.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.plasma.plasmaURL;
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import de.anomic.index.indexURLEntry;
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import de.anomic.net.URL;
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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.yacySeed;
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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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//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.getConfig("crawlResponse", "false").equals("true");
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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 (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.coreCrawlJobSize() + switchboard.limitCrawlTriggerJobSize() + switchboard.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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String newURL = new URL((String) urlv.get(0)).toNormalform();
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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 URL((String) refv.get(0)).toNormalform();
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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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// adding URL to noticeURL Queue
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env.getLog().logFinest("crawlOrder: a: url='" + newURL + "'");
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stackresult = stack(switchboard, newURL, 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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stackresult = stack(switchboard, (String) urlv.get(i), (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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}
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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, String 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.sbStackCrawlThread.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 = switchboard.urlPool.loadedURL.load(plasmaURL.urlHash(url), 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.urlPool.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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