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30888e7a2f
Such constraints may formulate specific restrictions to web searches This is implemented by scraping information for constraints from a web page during parsing, and storing flags to the pages within the web index. In this first step, only information for index pages ("index of", directory listings) are scraped and stored in flags - added new flag class kelondroBitfield - added scraper method in condenser - added bitfield structure for all scrape types (see also condenser) - added bitfield structure for appearance locations (see RWIEntry) - added handover protocol for remote search and index distribution - extended kelondroColumn class to hold bitfield types - added another search attribute on search page (index.html) - extended search-filter to enable filtering of non-matching constraints - set all new database types to be default - refactoring: moved word hash generation to condenser class git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@2999 6c8d7289-2bf4-0310-a012-ef5d649a1542
309 lines
17 KiB
Java
309 lines
17 KiB
Java
// search.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 search.java
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// if the shell's current path is htroot/yacy
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Set;
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import de.anomic.http.httpHeader;
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import de.anomic.kelondro.kelondroBitfield;
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import de.anomic.index.indexContainer;
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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.plasma.plasmaSearchEvent;
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import de.anomic.plasma.plasmaSearchQuery;
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import de.anomic.plasma.plasmaSearchRankingProfile;
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import de.anomic.plasma.plasmaSearchResult;
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import de.anomic.plasma.plasmaSearchTimingProfile;
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import de.anomic.plasma.plasmaSnippetCache;
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import de.anomic.plasma.plasmaSwitchboard;
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import de.anomic.server.serverCore;
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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.yacy.yacyCore;
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import de.anomic.yacy.yacyDHTAction;
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import de.anomic.yacy.yacySeed;
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public final class search {
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public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch ss) {
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if (post == null || ss == null) { return null; }
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// return variable that accumulates replacements
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final plasmaSwitchboard sb = (plasmaSwitchboard) ss;
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//System.out.println("yacy: search received request = " + post.toString());
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final String oseed = post.get("myseed", ""); // complete seed of the requesting peer
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// final String youare = post.get("youare", ""); // seed hash of the target peer, used for testing network stability
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final String key = post.get("key", ""); // transmission key for response
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final String query = post.get("query", ""); // a string of word hashes that shall be searched and combined
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String urls = post.get("urls", ""); // a string of url hashes that are preselected for the search: no other may be returned
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String abstracts = post.get("abstracts", ""); // a string of word hashes for abstracts that shall be generated, or 'auto' (for maxcount-word), or '' (for none)
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// final String fwdep = post.get("fwdep", ""); // forward depth. if "0" then peer may NOT ask another peer for more results
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// final String fwden = post.get("fwden", ""); // forward deny, a list of seed hashes. They may NOT be target of forward hopping
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final long duetime= post.getLong("duetime", 3000);
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final int count = post.getInt("count", 10); // maximum number of wanted results
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final int maxdist= post.getInt("maxdist", Integer.MAX_VALUE);
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final String prefer = post.get("prefer", "");
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final String filter = post.get("filter", ".*");
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final boolean includesnippet = post.get("includesnippet", "false").equals("true");
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final kelondroBitfield constraint = kelondroBitfield(4, post.get("constraint", "______"));
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// final boolean global = ((String) post.get("resource", "global")).equals("global"); // if true, then result may consist of answers from other peers
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// Date remoteTime = yacyCore.parseUniversalDate((String) post.get(yacySeed.MYTIME)); // read remote time
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// test:
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// http://localhost:8080/yacy/search.html?query=4galTpdpDM5Q (search for linux)
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// http://localhost:8080/yacy/search.html?query=gh8DKIhGKXws (search for book)
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// http://localhost:8080/yacy/search.html?query=4galTpdpDM5Qgh8DKIhGKXws&abstracts=auto (search for linux and book, generate abstract automatically)
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// http://localhost:8080/yacy/search.html?query=&abstracts=4galTpdpDM5Q (only abstracts for linux)
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// tell all threads to do nothing for a specific time
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sb.intermissionAllThreads(2 * duetime);
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Set abstractSet = ((abstracts.length() == 0) || (abstracts.equals("auto"))) ? null : plasmaSearchQuery.hashes2Set(abstracts);
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// store accessing peer
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if (yacyCore.seedDB == null) {
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yacyCore.log.logSevere("yacy.search: seed cache not initialized");
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} else {
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yacyCore.peerActions.peerArrival(yacySeed.genRemoteSeed(oseed, key, true), true);
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}
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// prepare search
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final Set keyhashes = plasmaSearchQuery.hashes2Set(query);
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final long timestamp = System.currentTimeMillis();
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serverObjects prop = new serverObjects();
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long timestamp1 = System.currentTimeMillis();
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// prepare an abstract result
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StringBuffer indexabstract = new StringBuffer();
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int joincount = 0;
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plasmaSearchResult acc = null;
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plasmaSearchQuery squery = null;
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if ((query.length() == 0) && (abstractSet != null)) {
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// this is _not_ a normal search, only a request for index abstracts
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squery = new plasmaSearchQuery(abstractSet, maxdist, prefer, count, duetime, filter, plasmaSearchQuery.catchall_constraint);
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squery.domType = plasmaSearchQuery.SEARCHDOM_LOCAL;
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yacyCore.log.logInfo("INIT HASH SEARCH (abstracts only): " + squery.anonymizedQueryHashes() + " - " + squery.wantedResults + " links");
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// prepare a search profile
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plasmaSearchRankingProfile rankingProfile = new plasmaSearchRankingProfile(new String[]{plasmaSearchRankingProfile.ORDER_YBR, plasmaSearchRankingProfile.ORDER_DATE, plasmaSearchRankingProfile.ORDER_QUALITY});
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plasmaSearchTimingProfile localTiming = new plasmaSearchTimingProfile(squery.maximumTime, squery.wantedResults);
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plasmaSearchTimingProfile remoteTiming = null;
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plasmaSearchEvent theSearch = new plasmaSearchEvent(squery, rankingProfile, localTiming, remoteTiming, true, yacyCore.log, sb.wordIndex, sb.urlPool.loadedURL, sb.snippetCache);
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Map containers = theSearch.localSearchContainers(plasmaSearchQuery.hashes2Set(urls));
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if (containers != null) {
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Iterator ci = containers.entrySet().iterator();
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Map.Entry entry;
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String wordhash;
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while (ci.hasNext()) {
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entry = (Map.Entry) ci.next();
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wordhash = (String) entry.getKey();
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indexContainer container = (indexContainer) entry.getValue();
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indexabstract.append("indexabstract." + wordhash + "=").append(plasmaURL.compressIndex(container, null, 1000).toString()).append(serverCore.crlfString);
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}
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}
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prop.put("indexcount", "");
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prop.put("joincount", 0);
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} else {
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// retrieve index containers from search request
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squery = new plasmaSearchQuery(keyhashes, maxdist, prefer, count, duetime, filter, constraint);
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squery.domType = plasmaSearchQuery.SEARCHDOM_LOCAL;
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yacyCore.log.logInfo("INIT HASH SEARCH (query-" + abstracts + "): " + squery.anonymizedQueryHashes() + " - " + squery.wantedResults + " links");
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// prepare a search profile
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plasmaSearchRankingProfile rankingProfile = new plasmaSearchRankingProfile(new String[]{plasmaSearchRankingProfile.ORDER_YBR, plasmaSearchRankingProfile.ORDER_DATE, plasmaSearchRankingProfile.ORDER_QUALITY});
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plasmaSearchTimingProfile localTiming = new plasmaSearchTimingProfile(squery.maximumTime, squery.wantedResults);
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plasmaSearchTimingProfile remoteTiming = null;
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plasmaSearchEvent theSearch = new plasmaSearchEvent(squery,
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rankingProfile, localTiming, remoteTiming, true,
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yacyCore.log, sb.wordIndex, sb.urlPool.loadedURL,
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sb.snippetCache);
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Map containers = theSearch.localSearchContainers(plasmaSearchQuery.hashes2Set(urls));
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// set statistic details of search result and find best result index set
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if (containers == null) {
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prop.put("indexcount", "");
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prop.put("joincount", "0");
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} else {
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Iterator ci = containers.entrySet().iterator();
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StringBuffer indexcount = new StringBuffer();
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Map.Entry entry;
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int maxcount = -1;
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double mindhtdistance = 1.1, d;
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String wordhash;
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String maxcounthash = null, neardhthash = null;
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while (ci.hasNext()) {
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entry = (Map.Entry) ci.next();
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wordhash = (String) entry.getKey();
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indexContainer container = (indexContainer) entry.getValue();
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if (container.size() > maxcount) {
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maxcounthash = wordhash;
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maxcount = container.size();
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}
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d = yacyDHTAction.dhtDistance(yacyCore.seedDB.mySeed.hash, wordhash);
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if (d < mindhtdistance) {
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mindhtdistance = d;
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neardhthash = wordhash;
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}
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indexcount.append("indexcount.").append(container.getWordHash()).append('=').append(Integer.toString(container.size())).append(serverCore.crlfString);
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if ((abstractSet != null) && (abstractSet.contains(wordhash))) {
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indexabstract.append("indexabstract." + wordhash + "=").append(plasmaURL.compressIndex(container, null,1000).toString()).append(serverCore.crlfString);
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}
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}
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prop.put("indexcount", new String(indexcount));
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// join and order the result
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indexContainer localResults = theSearch.localSearchJoin(containers.values());
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if (localResults == null) {
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joincount = 0;
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prop.put("joincount", 0);
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acc = null;
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} else {
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joincount = localResults.size();
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prop.put("joincount", Integer.toString(joincount));
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acc = theSearch.orderFinal(localResults);
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}
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// generate compressed index for maxcounthash
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// this is not needed if the search is restricted to specific
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// urls, because it is a re-search
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if ((maxcounthash == null) || (urls.length() != 0) || (keyhashes.size() == 1) || (abstracts.length() == 0)) {
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prop.put("indexabstract", "");
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} else if (abstracts.equals("auto")) {
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indexabstract.append("indexabstract." + maxcounthash + "=").append(plasmaURL.compressIndex(((indexContainer) containers.get(maxcounthash)),localResults, 1000).toString()).append(serverCore.crlfString);
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if ((neardhthash != null)
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&& (!(neardhthash.equals(maxcounthash)))) {
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indexabstract.append("indexabstract." + neardhthash + "=").append(plasmaURL.compressIndex(((indexContainer) containers.get(neardhthash)), localResults, 1000).toString()).append(serverCore.crlfString);
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}
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//System.out.println("DEBUG-ABSTRACTGENERATION: maxcounthash = " + maxcounthash);
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//System.out.println("DEBUG-ABSTRACTGENERATION: neardhthash = "+ neardhthash);
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//yacyCore.log.logFine("DEBUG HASH SEARCH: " + indexabstract);
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}
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}
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}
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prop.put("indexabstract", indexabstract.toString());
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// prepare result
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if ((joincount == 0) || (acc == null)) {
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// no results
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prop.put("links", "");
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prop.put("linkcount", "0");
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prop.put("references", "");
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} else {
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// result is a List of urlEntry elements
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int i = 0;
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StringBuffer links = new StringBuffer();
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String resource = "";
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//plasmaIndexEntry pie;
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indexURLEntry urlentry;
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plasmaSnippetCache.Snippet snippet;
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while ((acc.hasMoreElements()) && (i < squery.wantedResults)) {
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urlentry = (indexURLEntry) acc.nextElement();
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if (includesnippet) {
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snippet = sb.snippetCache.retrieveSnippet(urlentry.comp().url(), squery.queryHashes, false, 260, 1000);
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} else {
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snippet = null;
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}
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if ((snippet != null) && (snippet.getSource() == plasmaSnippetCache.ERROR_NO_MATCH)) {
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// suppress line: there is no match in that resource
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} else {
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if ((snippet != null) && (snippet.exists())) {
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resource = urlentry.toString(snippet.getLineRaw());
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} else {
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resource = urlentry.toString();
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}
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if (resource != null) {
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links.append("resource").append(i).append('=').append(resource).append(serverCore.crlfString);
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i++;
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}
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}
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}
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prop.put("links", new String(links));
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prop.put("linkcount", Integer.toString(i));
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// prepare reference hints
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Object[] ws = acc.getReferences(16);
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StringBuffer refstr = new StringBuffer();
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for (int j = 0; j < ws.length; j++)
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refstr.append(",").append((String) ws[j]);
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prop.put("references", (refstr.length() > 0) ? refstr.substring(1) : refstr.toString());
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}
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// add information about forward peers
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prop.put("fwhop", ""); // hops (depth) of forwards that had been performed to construct this result
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prop.put("fwsrc", ""); // peers that helped to construct this result
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prop.put("fwrec", ""); // peers that would have helped to construct this result (recommendations)
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// log
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yacyCore.log.logInfo("EXIT HASH SEARCH: " + squery.anonymizedQueryHashes() + " - " + joincount + " links found, " + prop.get("linkcount", "?") + " links selected, " + ((System.currentTimeMillis() - timestamp1) / 1000) + " seconds");
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prop.put("searchtime", Long.toString(System.currentTimeMillis() - timestamp));
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final int links = Integer.parseInt(prop.get("linkcount","0"));
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yacyCore.seedDB.mySeed.incSI(links);
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yacyCore.seedDB.mySeed.incSU(links);
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return prop;
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}
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private static kelondroBitfield kelondroBitfield(int i, String string) {
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// TODO Auto-generated method stub
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return null;
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}
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} |