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304 lines
16 KiB
304 lines
16 KiB
// 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 = new 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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} |