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400 lines
21 KiB
400 lines
21 KiB
// search.java
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// (C) 2004 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published on http://yacy.net
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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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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// LICENSE
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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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// 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.ArrayList;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.TreeSet;
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import de.anomic.content.RSSMessage;
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import de.anomic.document.parser.xml.RSSFeed;
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import de.anomic.http.httpHeader;
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import de.anomic.http.httpRequestHeader;
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import de.anomic.kelondro.order.Base64Order;
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import de.anomic.kelondro.order.Bitfield;
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import de.anomic.kelondro.text.ReferenceContainer;
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import de.anomic.kelondro.text.referencePrototype.WordReference;
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import de.anomic.kelondro.util.SortStack;
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import de.anomic.net.natLib;
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import de.anomic.plasma.plasmaProfiling;
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import de.anomic.plasma.plasmaSwitchboard;
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import de.anomic.search.QueryParams;
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import de.anomic.search.RankingProfile;
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import de.anomic.search.QueryEvent;
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import de.anomic.search.QueryEvent.ResultEntry;
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import de.anomic.search.RankingProcess.NavigatorEntry;
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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.serverProfiling;
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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.tools.iso639;
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import de.anomic.yacy.yacyCore;
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import de.anomic.yacy.yacyNetwork;
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import de.anomic.yacy.yacySeed;
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import de.anomic.yacy.yacyURL;
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public final class search {
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public static serverObjects respond(final httpRequestHeader header, final serverObjects post, final serverSwitch<?> env) {
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// return variable that accumulates replacements
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final plasmaSwitchboard sb = (plasmaSwitchboard) env;
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sb.remoteSearchLastAccess = System.currentTimeMillis();
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final serverObjects prop = new serverObjects();
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if ((post == null) || (env == null)) return prop;
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if (!yacyNetwork.authentifyRequest(post, env)) return prop;
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final String client = header.get(httpHeader.CONNECTION_PROP_CLIENTIP);
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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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final String exclude= post.get("exclude", "");// a string of word hashes that shall not be within the search result
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final 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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final 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 int count = Math.min(100, 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 contentdom = post.get("contentdom", "text");
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final String filter = post.get("filter", ".*");
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String sitehash = post.get("sitehash", ""); if (sitehash.length() == 0) sitehash = null;
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String authorhash = post.get("authorhash", ""); if (authorhash.length() == 0) authorhash = null;
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String language = post.get("language", "");
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if (language == null || language.length() == 0 || !iso639.exists(language)) {
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// take language from the user agent
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String agent = header.get("User-Agent");
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if (agent == null) agent = System.getProperty("user.language");
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language = (agent == null) ? "en" : iso639.userAgentLanguageDetection(agent);
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if (language == null) language = "en";
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}
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final int partitions = post.getInt("partitions", 30);
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String profile = post.get("profile", ""); // remote profile hand-over
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if (profile.length() > 0) profile = crypt.simpleDecode(profile, null);
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//final boolean includesnippet = post.get("includesnippet", "false").equals("true");
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Bitfield constraint = ((post.containsKey("constraint")) && (post.get("constraint", "").length() > 0)) ? new Bitfield(4, post.get("constraint", "______")) : null;
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if (constraint != null) {
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// check bad handover parameter from older versions
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boolean allon = true;
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for (int i = 0; i < 32; i++) {
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if (!constraint.get(i)) {allon = false; break;}
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}
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if (allon) constraint = null;
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}
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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=UEhMGfGv2vOE (search for kernel)
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// http://localhost:8080/yacy/search.html?query=ZX-LjaYo74PP (search for help)
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// http://localhost:8080/yacy/search.html?query=uDqIalxDfM2a (search for mail)
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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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if ((sb.isRobinsonMode()) &&
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(!((sb.isPublicRobinson()) ||
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(sb.isInMyCluster(header.get(httpHeader.CONNECTION_PROP_CLIENTIP)))))) {
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// if we are a robinson cluster, answer only if this client is known by our network definition
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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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return prop;
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}
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// check the search tracker
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TreeSet<Long> trackerHandles = sb.remoteSearchTracker.get(client);
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if (trackerHandles == null) trackerHandles = new TreeSet<Long>();
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boolean block = false;
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if (trackerHandles.tailSet(Long.valueOf(System.currentTimeMillis() - 3000)).size() > 1) {
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block = true;
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}
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if (trackerHandles.tailSet(Long.valueOf(System.currentTimeMillis() - 60000)).size() > 12) {
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block = true;
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}
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if (trackerHandles.tailSet(Long.valueOf(System.currentTimeMillis() - 600000)).size() > 36) {
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block = true;
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}
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if (block) {
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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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return prop;
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}
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// tell all threads to do nothing for a specific time
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sb.intermissionAllThreads(3000);
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final TreeSet<byte[]> abstractSet = ((abstracts.length() == 0) || (abstracts.equals("auto"))) ? null : QueryParams.hashes2Set(abstracts);
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// store accessing peer
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final yacySeed remoteSeed = yacySeed.genRemoteSeed(oseed, key, false);
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if (sb.peers == null) {
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yacyCore.log.logSevere("yacy.search: seed cache not initialized");
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} else {
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sb.peers.peerActions.peerArrival(remoteSeed, true);
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}
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// prepare search
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final TreeSet<byte[]> queryhashes = QueryParams.hashes2Set(query);
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final TreeSet<byte[]> excludehashes = (exclude.length() == 0) ? new TreeSet<byte[]>(Base64Order.enhancedCoder) : QueryParams.hashes2Set(exclude);
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final long timestamp = System.currentTimeMillis();
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// prepare a search profile
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final RankingProfile rankingProfile = (profile.length() == 0) ? new RankingProfile(QueryParams.contentdomParser(contentdom)) : new RankingProfile("", profile);
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// prepare an abstract result
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final StringBuilder indexabstract = new StringBuilder();
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int indexabstractContainercount = 0;
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int joincount = 0;
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QueryParams theQuery = null;
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ArrayList<SortStack<ResultEntry>.stackElement> accu = null;
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QueryEvent theSearch = 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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theQuery = new QueryParams(
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null,
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abstractSet,
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new TreeSet<byte[]>(Base64Order.enhancedCoder),
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null,
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null,
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rankingProfile,
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maxdist,
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prefer,
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QueryParams.contentdomParser(contentdom),
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language,
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"", // no navigation
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false,
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count,
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0,
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filter,
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QueryParams.SEARCHDOM_LOCAL,
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-1,
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null,
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false,
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sitehash,
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authorhash,
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yacyURL.TLD_any_zone_filter,
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client,
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false);
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theQuery.domType = QueryParams.SEARCHDOM_LOCAL;
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yacyCore.log.logInfo("INIT HASH SEARCH (abstracts only): " + QueryParams.anonymizedQueryHashes(theQuery.queryHashes) + " - " + theQuery.displayResults() + " links");
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final long timer = System.currentTimeMillis();
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//final Map<byte[], ReferenceContainer<WordReference>>[] containers = sb.indexSegment.index().searchTerm(theQuery.queryHashes, theQuery.excludeHashes, plasmaSearchQuery.hashes2StringSet(urls));
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final HashMap<byte[], ReferenceContainer<WordReference>> incc = sb.indexSegment.termIndex().searchConjunction(theQuery.queryHashes, QueryParams.hashes2StringSet(urls));
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serverProfiling.update("SEARCH", new plasmaProfiling.searchEvent(theQuery.id(true), QueryEvent.COLLECTION, incc.size(), System.currentTimeMillis() - timer), false);
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if (incc != null) {
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final Iterator<Map.Entry<byte[], ReferenceContainer<WordReference>>> ci = incc.entrySet().iterator();
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Map.Entry<byte[], ReferenceContainer<WordReference>> entry;
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byte[] wordhash;
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while (ci.hasNext()) {
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entry = ci.next();
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wordhash = entry.getKey();
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final ReferenceContainer<WordReference> container = entry.getValue();
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indexabstractContainercount += container.size();
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indexabstract.append("indexabstract." + new String(wordhash) + "=").append(ReferenceContainer.compressIndex(container, null, 1000).toString()).append(serverCore.CRLF_STRING);
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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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prop.put("references", "");
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} else {
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// retrieve index containers from search request
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theQuery = new QueryParams(
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null,
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queryhashes,
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excludehashes,
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null,
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null,
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rankingProfile,
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maxdist,
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prefer,
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QueryParams.
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contentdomParser(contentdom),
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language,
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"", // no navigation
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false,
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count,
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0,
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filter,
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QueryParams.SEARCHDOM_LOCAL,
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-1,
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constraint,
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false,
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sitehash,
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authorhash,
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yacyURL.TLD_any_zone_filter,
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client,
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false);
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theQuery.domType = QueryParams.SEARCHDOM_LOCAL;
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yacyCore.log.logInfo("INIT HASH SEARCH (query-" + abstracts + "): " + QueryParams.anonymizedQueryHashes(theQuery.queryHashes) + " - " + theQuery.displayResults() + " links");
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RSSFeed.channels(RSSFeed.REMOTESEARCH).addMessage(new RSSMessage("Remote Search Request from " + ((remoteSeed == null) ? "unknown" : remoteSeed.getName()), QueryParams.anonymizedQueryHashes(theQuery.queryHashes), ""));
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// make event
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theSearch = QueryEvent.getEvent(theQuery, sb.indexSegment, sb.peers, sb.crawlResults, null, true);
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// set statistic details of search result and find best result index set
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if (theSearch.getRankingResult().getLocalResourceSize() == 0) {
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prop.put("indexcount", "");
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prop.put("joincount", "0");
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} else {
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// attach information about index abstracts
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final StringBuilder indexcount = new StringBuilder();
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Map.Entry<byte[], Integer> entry;
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final Iterator<Map.Entry<byte[], Integer>> i = theSearch.IACount.entrySet().iterator();
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while (i.hasNext()) {
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entry = i.next();
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indexcount.append("indexcount.").append(new String(entry.getKey())).append('=').append((entry.getValue()).toString()).append(serverCore.CRLF_STRING);
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}
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if (abstractSet != null) {
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// if a specific index-abstract is demanded, attach it here
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final Iterator<byte[]> j = abstractSet.iterator();
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byte[] wordhash;
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while (j.hasNext()) {
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wordhash = j.next();
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indexabstractContainercount += (theSearch.IACount.get(wordhash)).intValue();
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indexabstract.append("indexabstract." + wordhash + "=").append(theSearch.IAResults.get(wordhash)).append(serverCore.CRLF_STRING);
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}
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}
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prop.put("indexcount", indexcount.toString());
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if (theSearch.getRankingResult().getLocalResourceSize() == 0) {
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joincount = 0;
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prop.put("joincount", "0");
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} else {
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joincount = theSearch.getRankingResult().getLocalResourceSize();
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prop.put("joincount", Integer.toString(joincount));
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accu = theSearch.completeResults(3000);
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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 ((theSearch.IAmaxcounthash == null) || (urls.length() != 0) || (queryhashes.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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// automatically attach the index abstract for the index that has the most references. This should be our target dht position
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indexabstractContainercount += (theSearch.IACount.get(theSearch.IAmaxcounthash)).intValue();
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indexabstract.append("indexabstract." + theSearch.IAmaxcounthash + "=").append(theSearch.IAResults.get(theSearch.IAmaxcounthash)).append(serverCore.CRLF_STRING);
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if ((theSearch.IAneardhthash != null) && (!(theSearch.IAneardhthash.equals(theSearch.IAmaxcounthash)))) {
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// in case that the neardhthash is different from the maxcounthash attach also the neardhthash-container
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indexabstractContainercount += (theSearch.IACount.get(theSearch.IAneardhthash)).intValue();
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indexabstract.append("indexabstract." + theSearch.IAneardhthash + "=").append(theSearch.IAResults.get(theSearch.IAneardhthash)).append(serverCore.CRLF_STRING);
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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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if (partitions > 0) sb.requestedQueries = sb.requestedQueries + 1d / partitions; // increase query counter
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// prepare reference hints
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final long timer = System.currentTimeMillis();
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final ArrayList<NavigatorEntry> ws = theSearch.getTopicNavigator(10);
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final StringBuilder refstr = new StringBuilder();
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for (NavigatorEntry e: ws) {
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refstr.append(",").append(e.name);
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}
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prop.put("references", (refstr.length() > 0) ? refstr.substring(1) : refstr.toString());
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serverProfiling.update("SEARCH", new plasmaProfiling.searchEvent(theQuery.id(true), "reference collection", ws.size(), System.currentTimeMillis() - timer), false);
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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) || (accu == 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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final long timer = System.currentTimeMillis();
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final StringBuilder links = new StringBuilder();
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String resource = null;
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SortStack<QueryEvent.ResultEntry>.stackElement entry;
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for (int i = 0; i < accu.size(); i++) {
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entry = accu.get(i);
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resource = entry.element.resource();
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if (resource != null) {
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links.append("resource").append(i).append('=').append(resource).append(serverCore.CRLF_STRING);
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}
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}
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prop.put("links", links.toString());
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prop.put("linkcount", accu.size());
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serverProfiling.update("SEARCH", new plasmaProfiling.searchEvent(theQuery.id(true), "result list preparation", accu.size(), System.currentTimeMillis() - timer), false);
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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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// prepare search statistics
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theQuery.remotepeer = sb.peers.lookupByIP(natLib.getInetAddress(client), true, false, false);
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theQuery.resultcount = (theSearch == null) ? 0 : theSearch.getRankingResult().getLocalResourceSize() + theSearch.getRankingResult().getRemoteResourceSize();
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theQuery.searchtime = System.currentTimeMillis() - timestamp;
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theQuery.urlretrievaltime = (theSearch == null) ? 0 : theSearch.getURLRetrievalTime();
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theQuery.snippetcomputationtime = (theSearch == null) ? 0 : theSearch.getSnippetComputationTime();
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sb.remoteSearches.add(theQuery);
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// update the search tracker
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trackerHandles.add(theQuery.handle);
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sb.remoteSearchTracker.put(client, trackerHandles);
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// log
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yacyCore.log.logInfo("EXIT HASH SEARCH: " +
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QueryParams.anonymizedQueryHashes(theQuery.queryHashes) + " - " + joincount + " links found, " +
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prop.get("linkcount", "?") + " links selected, " +
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indexabstractContainercount + " index abstracts, " +
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(System.currentTimeMillis() - timestamp) + " milliseconds");
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prop.put("searchtime", System.currentTimeMillis() - timestamp);
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final int links = Integer.parseInt(prop.get("linkcount","0"));
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sb.peers.mySeed().incSI(links);
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sb.peers.mySeed().incSU(links);
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return prop;
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}
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}
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