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445 lines
18 KiB
445 lines
18 KiB
// PeerSelection.java
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// -------------------------------------
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published 05.11.2008 on http://yacy.net
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// Frankfurt, Germany, 2008
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//
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// $LastChangedDate: 2008-09-03 02:30:21 +0200 (Mi, 03 Sep 2008) $
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// $LastChangedRevision: 5102 $
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// $LastChangedBy: orbiter $
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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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package de.anomic.yacy.dht;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.SortedMap;
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import net.yacy.cora.date.AbstractFormatter;
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import net.yacy.cora.document.UTF8;
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import net.yacy.cora.storage.DynamicScore;
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import net.yacy.cora.storage.ScoreCluster;
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import net.yacy.kelondro.data.word.Word;
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import net.yacy.kelondro.index.HandleSet;
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import net.yacy.kelondro.index.RowSpaceExceededException;
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import net.yacy.kelondro.logging.Log;
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import net.yacy.kelondro.order.Base64Order;
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import net.yacy.kelondro.order.Digest;
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import net.yacy.kelondro.util.kelondroException;
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import de.anomic.yacy.yacyCore;
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import de.anomic.yacy.yacySeed;
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import de.anomic.yacy.yacySeedDB;
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import de.anomic.yacy.yacyVersion;
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/*
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* this package is a collection of peer selection iterations that had been
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* part of yacyPeerActions, yacyDHTActions and yacySeedDB
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*/
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public class PeerSelection {
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public static yacySeed[] selectClusterPeers(final yacySeedDB seedDB, final SortedMap<byte[], String> peerhashes) {
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final Iterator<Map.Entry<byte[], String>> i = peerhashes.entrySet().iterator();
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final List<yacySeed> l = new ArrayList<yacySeed>();
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Map.Entry<byte[], String> entry;
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yacySeed s;
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while (i.hasNext()) {
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entry = i.next();
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s = seedDB.get(UTF8.String(entry.getKey())); // should be getConnected; get only during testing time
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if (s != null) {
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s.setAlternativeAddress(entry.getValue());
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l.add(s);
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}
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}
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return l.toArray(new yacySeed[l.size()]);
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}
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public static yacySeed[] selectSearchTargets(
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final yacySeedDB seedDB,
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final HandleSet wordhashes,
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int redundancy,
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int burstRobinsonPercent,
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int burstMultiwordPercent) {
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// find out a specific number of seeds, that would be relevant for the given word hash(es)
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// the result is ordered by relevance: [0] is most relevant
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// the seedcount is the maximum number of wanted results
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if (seedDB == null) { return null; }
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// put in seeds according to dht
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final Map<String, yacySeed> regularSeeds = new HashMap<String, yacySeed>(); // dht position seeds
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yacySeed seed;
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Iterator<yacySeed> dhtEnum;
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Iterator<byte[]> iter = wordhashes.iterator();
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while (iter.hasNext()) {
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selectDHTPositions(seedDB, iter.next(), redundancy, regularSeeds);
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}
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//int minimumseeds = Math.min(seedDB.scheme.verticalPartitions(), regularSeeds.size()); // that should be the minimum number of seeds that are returned
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//int maximumseeds = seedDB.scheme.verticalPartitions() * redundancy; // this is the maximum number of seeds according to dht and heuristics. It can be more using burst mode.
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// put in some seeds according to size of peer.
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// But not all, that would produce too much load on the largest peers
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dhtEnum = seedDB.seedsSortedConnected(false, yacySeed.ICOUNT);
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int c = Math.max(Math.min(5, seedDB.sizeConnected()), wordhashes.size() > 1 ? seedDB.sizeConnected() * burstMultiwordPercent / 100 : 0);
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while (dhtEnum.hasNext() && c-- > 0) {
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seed = dhtEnum.next();
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if (seed == null) continue;
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if (seed.isLastSeenTimeout(3600000)) continue;
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if (seed.getAge() < 1) { // the 'workshop feature'
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Log.logInfo("DHT", "selectPeers/Age: " + seed.hash + ":" + seed.getName() + ", is newbie, age = " + seed.getAge());
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regularSeeds.put(seed.hash, seed);
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continue;
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}
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if (Math.random() * 100 + (wordhashes.size() > 1 ? burstMultiwordPercent : 25) >= 50) {
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if (Log.isFine("DHT")) Log.logFine("DHT", "selectPeers/CountBurst: " + seed.hash + ":" + seed.getName() + ", RWIcount=" + seed.getWordCount());
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regularSeeds.put(seed.hash, seed);
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continue;
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}
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}
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// create a set that contains only robinson peers because these get a special handling
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dhtEnum = seedDB.seedsConnected(true, false, null, 0.50f);
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Set<yacySeed> robinson = new HashSet<yacySeed>();
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while (dhtEnum.hasNext()) {
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seed = dhtEnum.next();
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if (seed == null) continue;
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if (seed.isLastSeenTimeout(3600000)) continue;
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if (!seed.getFlagAcceptRemoteIndex()) robinson.add(seed);
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}
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// add robinson peers according to robinson burst rate
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dhtEnum = robinson.iterator();
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c = robinson.size() * burstRobinsonPercent / 100;
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while (dhtEnum.hasNext() && c-- > 0) {
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seed = dhtEnum.next();
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if (seed == null) continue;
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if (seed.isLastSeenTimeout(3600000)) continue;
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if (Math.random() * 100 + burstRobinsonPercent >= 100) {
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if (Log.isFine("DHT")) Log.logFine("DHT", "selectPeers/RobinsonBurst: " + seed.hash + ":" + seed.getName());
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regularSeeds.put(seed.hash, seed);
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continue;
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}
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}
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// put in seeds that are public robinson peers and where the peer tags match with query
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// or seeds that are newbies to ensure that private demonstrations always work
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dhtEnum = robinson.iterator();
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while (dhtEnum.hasNext()) {
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seed = dhtEnum.next();
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if (seed == null) continue;
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if (seed.isLastSeenTimeout(3600000)) continue;
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if (seed.matchPeerTags(wordhashes)) {
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// peer tags match
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String specialized = seed.getPeerTags().toString();
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if (!specialized.equals("[*]")) Log.logInfo("DHT", "selectPeers/PeerTags: " + seed.hash + ":" + seed.getName() + ", is specialized peer for " + specialized);
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regularSeeds.put(seed.hash, seed);
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}
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}
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// produce return set
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yacySeed[] result = new yacySeed[regularSeeds.size()];
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result = regularSeeds.values().toArray(result);
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return result;
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}
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private static void selectDHTPositions(
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final yacySeedDB seedDB,
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byte[] wordhash,
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int redundancy,
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Map<String, yacySeed> regularSeeds) {
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// this method is called from the search target computation
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final long[] dhtVerticalTargets = seedDB.scheme.dhtPositions(wordhash);
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yacySeed seed;
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for (long dhtVerticalTarget : dhtVerticalTargets) {
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wordhash = FlatWordPartitionScheme.positionToHash(dhtVerticalTarget);
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Iterator<yacySeed> dhtEnum = getAcceptRemoteIndexSeeds(seedDB, wordhash, redundancy, false);
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int c = Math.min(seedDB.sizeConnected(), redundancy);
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int cc = 2; // select a maximum of 3, this is enough redundancy
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while (dhtEnum.hasNext() && c > 0 && cc-- > 0) {
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seed = dhtEnum.next();
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if (seed == null || seed.hash == null) continue;
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if (!seed.getFlagAcceptRemoteIndex()) continue; // probably a robinson peer
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if (Log.isFine("DHT")) Log.logFine("DHT", "selectPeers/DHTorder: " + seed.hash + ":" + seed.getName() + "/ score " + c);
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regularSeeds.put(seed.hash, seed);
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c--;
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}
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}
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}
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public static byte[] selectTransferStart() {
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return Base64Order.enhancedCoder.encode(Digest.encodeMD5Raw(Long.toString(System.currentTimeMillis()))).substring(2, 2 + Word.commonHashLength).getBytes();
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}
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public static byte[] limitOver(final yacySeedDB seedDB, final byte[] startHash) {
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final Iterator<yacySeed> seeds = getAcceptRemoteIndexSeeds(seedDB, startHash, 1, false);
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if (seeds.hasNext()) return seeds.next().hash.getBytes();
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return null;
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}
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protected static List<yacySeed> getAcceptRemoteIndexSeedsList(
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yacySeedDB seedDB,
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final byte[] starthash,
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int max,
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boolean alsoMyOwn) {
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final Iterator<yacySeed> seedIter = getAcceptRemoteIndexSeeds(seedDB, starthash, max, alsoMyOwn);
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final ArrayList<yacySeed> targets = new ArrayList<yacySeed>();
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while (seedIter.hasNext() && max-- > 0) targets.add(seedIter.next());
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return targets;
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}
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/**
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* returns an enumeration of yacySeed-Objects that have the AcceptRemoteIndex-Flag set
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* the seeds are enumerated in the right order according to the DHT
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* @param seedDB
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* @param starthash
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* @param max
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* @param alsoMyOwn
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* @return
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*/
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public static Iterator<yacySeed> getAcceptRemoteIndexSeeds(final yacySeedDB seedDB, final byte[] starthash, final int max, final boolean alsoMyOwn) {
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return new acceptRemoteIndexSeedEnum(seedDB, starthash, Math.min(max, seedDB.sizeConnected()), alsoMyOwn);
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}
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private static class acceptRemoteIndexSeedEnum implements Iterator<yacySeed> {
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private final Iterator<yacySeed> se;
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private yacySeed nextSeed;
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private final yacySeedDB seedDB;
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private final HandleSet doublecheck;
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private int remaining;
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private boolean alsoMyOwn;
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private acceptRemoteIndexSeedEnum(yacySeedDB seedDB, final byte[] starthash, int max, boolean alsoMyOwn) {
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this.seedDB = seedDB;
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this.se = getDHTSeeds(seedDB, starthash, yacyVersion.YACY_HANDLES_COLLECTION_INDEX);
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this.remaining = max;
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this.doublecheck = new HandleSet(12, Base64Order.enhancedCoder, 0);
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this.nextSeed = nextInternal();
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this.alsoMyOwn = alsoMyOwn && nextSeed != null && (Base64Order.enhancedCoder.compare(seedDB.mySeed().hash.getBytes(), nextSeed.hash.getBytes()) > 0);
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}
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public boolean hasNext() {
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return nextSeed != null;
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}
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private yacySeed nextInternal() {
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if (this.remaining <= 0) return null;
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yacySeed s;
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try {
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while (se.hasNext()) {
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s = se.next();
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if (s == null) return null;
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byte[] hashb = s.hash.getBytes();
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if (doublecheck.has(hashb)) return null;
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try {
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this.doublecheck.put(hashb);
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} catch (RowSpaceExceededException e) {
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Log.logException(e);
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break;
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}
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if (s.getFlagAcceptRemoteIndex()) {
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this.remaining--;
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return s;
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}
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}
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} catch (final kelondroException e) {
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System.out.println("DEBUG acceptRemoteIndexSeedEnum:" + e.getMessage());
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yacyCore.log.logSevere("database inconsistency (" + e.getMessage() + "), re-set of db.");
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seedDB.resetActiveTable();
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return null;
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}
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return null;
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}
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public yacySeed next() {
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if (alsoMyOwn && Base64Order.enhancedCoder.compare(seedDB.mySeed().hash.getBytes(), nextSeed.hash.getBytes()) < 0) {
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// take my own seed hash instead the enumeration result
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alsoMyOwn = false;
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return seedDB.mySeed();
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} else {
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final yacySeed next = nextSeed;
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nextSeed = nextInternal();
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return next;
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}
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}
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public void remove() {
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throw new UnsupportedOperationException();
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}
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}
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/**
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* enumerate seeds for DHT target positions
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* @param seedDB
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* @param firstHash
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* @param minVersion
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* @return
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*/
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protected static Iterator<yacySeed> getDHTSeeds(final yacySeedDB seedDB, final byte[] firstHash, final float minVersion) {
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// enumerates seed-type objects: all seeds with starting point in the middle, rotating at the end/beginning
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return new seedDHTEnum(seedDB, firstHash, minVersion);
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}
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private static class seedDHTEnum implements Iterator<yacySeed> {
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private Iterator<yacySeed> e1, e2;
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private int steps;
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private float minVersion;
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private yacySeedDB seedDB;
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private seedDHTEnum(final yacySeedDB seedDB, final byte[] firstHash, final float minVersion) {
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this.seedDB = seedDB;
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this.steps = seedDB.sizeConnected();
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this.minVersion = minVersion;
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this.e1 = seedDB.seedsConnected(true, false, firstHash, minVersion);
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this.e2 = null;
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}
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public boolean hasNext() {
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return (steps > 0) && ((e2 == null) || (e2.hasNext()));
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}
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public yacySeed next() {
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if (steps == 0) return null;
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steps--;
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if (e1 == null || !e1.hasNext()) {
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if (e2 == null) {
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e1 = null;
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e2 = seedDB.seedsConnected(true, false, null, minVersion);
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}
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return e2.next();
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}
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final yacySeed n = e1.next();
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if (!(e1.hasNext())) {
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e1 = null;
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e2 = seedDB.seedsConnected(true, false, null, minVersion);
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}
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return n;
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}
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public void remove() {
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throw new UnsupportedOperationException();
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}
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}
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/**
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* enumerate peers that provide remote crawl urls
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* @param seedDB
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* @return an iterator of seed objects
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*/
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public static Iterator<yacySeed> getProvidesRemoteCrawlURLs(final yacySeedDB seedDB) {
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return new providesRemoteCrawlURLsEnum(seedDB);
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}
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private static class providesRemoteCrawlURLsEnum implements Iterator<yacySeed> {
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private Iterator<yacySeed> se;
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private yacySeed nextSeed;
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private yacySeedDB seedDB;
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private providesRemoteCrawlURLsEnum(final yacySeedDB seedDB) {
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this.seedDB = seedDB;
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se = getDHTSeeds(seedDB, null, yacyVersion.YACY_POVIDES_REMOTECRAWL_LISTS);
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nextSeed = nextInternal();
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}
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public boolean hasNext() {
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return nextSeed != null;
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}
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private yacySeed nextInternal() {
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yacySeed s;
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try {
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while (se.hasNext()) {
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s = se.next();
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if (s == null) return null;
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if (s.getLong(yacySeed.RCOUNT, 0) > 0) return s;
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}
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} catch (final kelondroException e) {
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System.out.println("DEBUG providesRemoteCrawlURLsEnum:" + e.getMessage());
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yacyCore.log.logSevere("database inconsistency (" + e.getMessage() + "), re-set of db.");
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seedDB.resetActiveTable();
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return null;
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}
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return null;
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}
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public yacySeed next() {
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final yacySeed next = nextSeed;
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nextSeed = nextInternal();
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return next;
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}
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public void remove() {
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throw new UnsupportedOperationException();
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}
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}
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/**
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* get either the youngest or oldest peers from the seed db. Count as many as requested
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* @param seedDB
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* @param up if up = true then get the most recent peers, if up = false then get oldest
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* @param count number of wanted peers
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* @return a hash map of peer hashes to seed object
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*/
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public static Map<String, yacySeed> seedsByAge(final yacySeedDB seedDB, final boolean up, int count) {
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if (count > seedDB.sizeConnected()) count = seedDB.sizeConnected();
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// fill a score object
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final DynamicScore<String> seedScore = new ScoreCluster<String>();
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yacySeed ys;
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long absage;
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final Iterator<yacySeed> s = seedDB.seedsConnected(true, false, null, (float) 0.0);
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int searchcount = 1000;
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if (searchcount > seedDB.sizeConnected()) searchcount = seedDB.sizeConnected();
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try {
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while ((s.hasNext()) && (searchcount-- > 0)) {
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ys = s.next();
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if ((ys != null) && (ys.get(yacySeed.LASTSEEN, "").length() > 10)) try {
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absage = Math.abs(System.currentTimeMillis() + AbstractFormatter.dayMillis - ys.getLastSeenUTC()) / 1000 / 60;
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if (absage > Integer.MAX_VALUE) absage = Integer.MAX_VALUE;
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seedScore.inc(ys.hash, (int) absage); // the higher absage, the older is the peer
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} catch (final Exception e) {}
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}
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// result is now in the score object; create a result vector
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final Map<String, yacySeed> result = new HashMap<String, yacySeed>();
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final Iterator<String> it = seedScore.keys(up);
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int c = 0;
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while ((c < count) && (it.hasNext())) {
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c++;
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ys = seedDB.getConnected(it.next());
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if ((ys != null) && (ys.hash != null)) result.put(ys.hash, ys);
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}
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return result;
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} catch (final kelondroException e) {
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yacyCore.log.logSevere("Internal Error at yacySeedDB.seedsByAge: " + e.getMessage(), e);
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return null;
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}
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}
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}
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