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258 lines
12 KiB
258 lines
12 KiB
// yacyPeerActions.java
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// -------------------------------------
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://yacy.net
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// Frankfurt, Germany, 2005
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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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package de.anomic.yacy;
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import java.io.IOException;
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import java.util.HashMap;
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import de.anomic.server.serverCodings;
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import de.anomic.server.serverDate;
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import de.anomic.server.logging.serverLog;
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import de.anomic.xml.RSSFeed;
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import de.anomic.xml.RSSMessage;
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public class yacyPeerActions {
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private final yacySeedDB seedDB;
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private HashMap<String, String> userAgents;
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public long disconnects;
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private final yacyNewsPool newsPool;
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public yacyPeerActions(final yacySeedDB seedDB, final yacyNewsPool newsPool) {
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this.seedDB = seedDB;
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this.newsPool = newsPool;
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this.userAgents = new HashMap<String, String>();
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this.disconnects = 0;
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}
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public void close() {
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// the seedDB and newsPool should be cleared elsewhere
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if (userAgents != null) userAgents.clear();
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userAgents = null;
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}
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public synchronized boolean connectPeer(final yacySeed seed, final boolean direct) {
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// store a remote peer's seed
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// returns true if the peer is new and previously unknown
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if (seed == null) {
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yacyCore.log.logSevere("connect: WRONG seed (NULL)");
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return false;
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}
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final String error = seed.isProper(false);
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if (error != null) {
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yacyCore.log.logSevere("connect: WRONG seed (" + seed.getName() + "/" + seed.hash + "): " + error);
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return false;
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}
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if ((this.seedDB.mySeedIsDefined()) && (seed.hash.equals(this.seedDB.mySeed().hash))) {
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yacyCore.log.logInfo("connect: SELF reference " + seed.getPublicAddress());
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return false;
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}
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final String peerType = seed.get(yacySeed.PEERTYPE, yacySeed.PEERTYPE_VIRGIN);
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if ((peerType.equals(yacySeed.PEERTYPE_VIRGIN)) || (peerType.equals(yacySeed.PEERTYPE_JUNIOR))) {
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// reject unqualified seeds
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: rejecting NOT QUALIFIED " + peerType + " seed " + seed.getName());
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return false;
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}
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if (!(peerType.equals(yacySeed.PEERTYPE_SENIOR) || peerType.equals(yacySeed.PEERTYPE_PRINCIPAL))) {
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// reject unqualified seeds
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: rejecting NOT QUALIFIED " + peerType + " seed " + seed.getName());
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return false;
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}
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final yacySeed doubleSeed = this.seedDB.lookupByIP(seed.getInetAddress(), true, false, false);
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if ((doubleSeed != null) && (doubleSeed.getPort() == seed.getPort()) && (!(doubleSeed.hash.equals(seed.hash)))) {
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// a user frauds with his peer different peer hashes
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: rejecting FRAUD (double hashes " + doubleSeed.hash + "/" + seed.hash + " on same port " + seed.getPort() + ") peer " + seed.getName());
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return false;
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}
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if (seed.get(yacySeed.LASTSEEN, "").length() != 14) {
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// hack for peers that do not have a LastSeen date
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seed.setLastSeenUTC();
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: reset wrong date (" + seed.getName() + "/" + seed.hash + ")");
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}
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// connection time
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final long nowUTC0Time = System.currentTimeMillis(); // is better to have this value in a variable for debugging
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long ctimeUTC0 = seed.getLastSeenUTC();
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if (ctimeUTC0 > nowUTC0Time) {
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// the peer is future-dated, correct it
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seed.setLastSeenUTC();
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ctimeUTC0 = nowUTC0Time;
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assert (seed.getLastSeenUTC() - ctimeUTC0 < 100);
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}
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if (Math.abs(nowUTC0Time - ctimeUTC0) > 60 * 60 * 24 * 1000) {
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// the new connection is out-of-age, we reject the connection
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: rejecting out-dated peer '" + seed.getName() + "' from " + seed.getPublicAddress() + "; nowUTC0=" + nowUTC0Time + ", seedUTC0=" + ctimeUTC0 + ", TimeDiff=" + serverDate.formatInterval(Math.abs(nowUTC0Time - ctimeUTC0)));
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return false;
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}
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// disconnection time
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long dtimeUTC0;
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final yacySeed disconnectedSeed = seedDB.getDisconnected(seed.hash);
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if (disconnectedSeed == null) {
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dtimeUTC0 = 0; // never disconnected: virtually disconnected maximum time ago
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} else {
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dtimeUTC0 = disconnectedSeed.getLong("dct", 0);
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}
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if (direct) {
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// remember the moment
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// Date applies the local UTC offset, which is wrong
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// we correct that by subtracting the local offset and adding
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// the remote offset.
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seed.setLastSeenUTC();
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seed.setFlagDirectConnect(true);
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} else {
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// set connection flag
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if (Math.abs(nowUTC0Time - ctimeUTC0) > 120000) seed.setFlagDirectConnect(false); // 2 minutes
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}
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// update latest version number
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if (seed.getVersion() > yacyVersion.latestRelease) yacyVersion.latestRelease = seed.getVersion();
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// prepare to update
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if (disconnectedSeed != null) {
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// if the indirect connect aims to announce a peer that we know
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// has been disconnected then we compare the dates:
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// if the new peer has a LastSeen date, and that date is before
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// the disconnection date, then we ignore the new peer
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if (!direct) {
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if (ctimeUTC0 < dtimeUTC0) {
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// the disconnection was later, we reject the connection
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: rejecting disconnected peer '" + seed.getName() + "' from " + seed.getPublicAddress());
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return false;
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}
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}
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// this is a return of a lost peer
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: returned KNOWN " + peerType + " peer '" + seed.getName() + "' from " + seed.getPublicAddress());
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this.seedDB.addConnected(seed);
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return true;
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}
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final yacySeed connectedSeed = this.seedDB.getConnected(seed.hash);
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if (connectedSeed != null) {
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// the seed is known: this is an update
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try {
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// if the old LastSeen date is later then the other
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// info, then we reject the info
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if ((ctimeUTC0 < (connectedSeed.getLastSeenUTC())) && (!direct)) {
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: rejecting old info about peer '" + seed.getName() + "'");
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return false;
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}
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/*if (connectedSeed.getName() != seed.getName()) {
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// TODO: update seed name lookup cache
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}*/
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} catch (final NumberFormatException e) {
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: rejecting wrong peer '" + seed.getName() + "' from " + seed.getPublicAddress() + ". Cause: " + e.getMessage());
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return false;
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}
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: updated KNOWN " + ((direct) ? "direct " : "") + peerType + " peer '" + seed.getName() + "' from " + seed.getPublicAddress());
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seedDB.addConnected(seed);
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return true;
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}
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// the seed is new
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if ((seedDB.mySeedIsDefined()) && (seed.getIP().equals(this.seedDB.mySeed().getIP()))) {
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// seed from the same IP as the calling client: can be
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// the case if there runs another one over a NAT
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: saved NEW seed (myself IP) " + seed.getPublicAddress());
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} else {
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// completely new seed
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: saved NEW " + peerType + " peer '" + seed.getName() + "' from " + seed.getPublicAddress());
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}
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this.seedDB.addConnected(seed);
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return true;
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}
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public boolean peerArrival(final yacySeed peer, final boolean direct) {
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if (peer == null) return false;
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final boolean res = connectPeer(peer, direct);
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if (res) {
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// perform all actions if peer is effective new
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this.processPeerArrival(peer, direct);
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RSSFeed.channels(RSSFeed.PEERNEWS).addMessage(new RSSMessage(peer.getName() + " joined the network", "", ""));
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}
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return res;
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}
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public void peerDeparture(final yacySeed peer, final String cause) {
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if (peer == null) return;
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// we do this if we did not get contact with the other peer
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if (yacyCore.log.isFine()) yacyCore.log.logFine("connect: no contact to a " + peer.get(yacySeed.PEERTYPE, yacySeed.PEERTYPE_VIRGIN) + " peer '" + peer.getName() + "' at " + peer.getPublicAddress() + ". Cause: " + cause);
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synchronized (seedDB) {
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if (!seedDB.hasDisconnected(peer.hash)) { disconnects++; }
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peer.put("dct", Long.toString(System.currentTimeMillis()));
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seedDB.addDisconnected(peer); // update info
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}
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RSSFeed.channels(RSSFeed.PEERNEWS).addMessage(new RSSMessage(peer.getName() + " left the network", "", ""));
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}
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public void peerPing(final yacySeed peer) {
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if (peer == null) return;
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// this is called only if the peer has junior status
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seedDB.addPotential(peer);
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// perform all actions
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processPeerArrival(peer, true);
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RSSFeed.channels(RSSFeed.PEERNEWS).addMessage(new RSSMessage(peer.getName() + " sent me a ping", "", ""));
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}
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private void processPeerArrival(final yacySeed peer, final boolean direct) {
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final String recordString = peer.get("news", null);
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//System.out.println("### triggered news arrival from peer " + peer.getName() + ", news " + ((recordString == null) ? "empty" : "attached"));
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if ((recordString == null) || (recordString.length() == 0)) return;
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final String decodedString = de.anomic.tools.crypt.simpleDecode(recordString, "");
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final yacyNewsRecord record = yacyNewsRecord.newRecord(decodedString);
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if (record != null) {
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//System.out.println("### news arrival from peer " + peer.getName() + ", decoded=" + decodedString + ", record=" + recordString + ", news=" + record.toString());
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final String cre1 = serverCodings.string2map(decodedString, ",").get("cre");
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final String cre2 = serverCodings.string2map(record.toString(), ",").get("cre");
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if ((cre1 == null) || (cre2 == null) || (!(cre1.equals(cre2)))) {
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System.out.println("### ERROR - cre are not equal: cre1=" + cre1 + ", cre2=" + cre2);
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return;
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}
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try {
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synchronized (this.newsPool) {this.newsPool.enqueueIncomingNews(record);}
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} catch (final IOException e) {
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serverLog.logSevere("YACY", "processPeerArrival", e);
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}
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}
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}
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public void setUserAgent(final String IP, final String userAgent) {
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if (userAgents == null) return; // case can happen during shutdown
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userAgents.put(IP, userAgent);
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}
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public String getUserAgent(final String IP) {
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final String userAgent = userAgents.get(IP);
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return (userAgent == null) ? "" : userAgent;
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}
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}
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