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190 lines
8.3 KiB
190 lines
8.3 KiB
// 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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// last change: 02.05.2004
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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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// You must compile this file with
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// javac -classpath .:../classes crawlOrder.java
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import java.net.URL;
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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.plasmaCrawlLURL;
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import de.anomic.plasma.plasmaSwitchboard;
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import de.anomic.plasma.plasmaURL;
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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 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 = (String) post.get("iam", ""); // seed hash of requester
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String youare = (String) post.get("youare", ""); // seed hash of the target peer, needed for network stability
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String process = (String) post.get("process", ""); // process type
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String key = (String) post.get("key", ""); // transmission key
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String url = crypt.simpleDecode((String) post.get("url", ""), key); // the url string to crawl
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String referrer = crypt.simpleDecode((String) post.get("referrer", ""), key); // the referrer url
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int orderDepth = Integer.parseInt((String) post.get("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 acceptDelay = Integer.parseInt(switchboard.getConfig("crawlResponseDelay", "0"));
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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 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.queueSize();
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String urlhash = plasmaURL.urlHash(new URL(url));
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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 > 1) {
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response = "rejected";
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reason = "busy";
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delay = "" + (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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// stack url
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String reasonString = switchboard.stackCrawl(url, referrer, iam, "REMOTE-CRAWLING", new Date(), 0, switchboard.defaultRemoteProfile);
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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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delay = "" + acceptDelay; // this value needs to be calculated individually
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} else if (reasonString.equals("double_(already_loaded)")) {
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// case where we have already the url loaded;
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reason = reasonString;
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delay = "" + (acceptDelay / 4);
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// send lurl-Entry as response
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plasmaCrawlLURL.entry entry = switchboard.urlPool.loadedURL.getEntry(plasmaCrawlLURL.urlHash(url));
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if (entry != null) {
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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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delay = "1";
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} else {
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response = "rejected";
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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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delay = "" + (acceptDelay / 4);
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}
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}
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} catch (Exception e) {
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// mist
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e.printStackTrace();
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reason = "ERROR: " + e.getMessage();
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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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}
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