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yacy_search_server/source/de/anomic/yacy/yacySeed.java

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// yacySeed.java
// -------------------------------------
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2004
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// Using this software in any meaning (reading, learning, copying, compiling,
// running) means that you agree that the Author(s) is (are) not responsible
// for cost, loss of data or any harm that may be caused directly or indirectly
// by usage of this softare or this documentation. The usage of this software
// is on your own risk. The installation and usage (starting/running) of this
// software may allow other people or application to access your computer and
// any attached devices and is highly dependent on the configuration of the
// software which must be done by the user of the software; the author(s) is
// (are) also not responsible for proper configuration and usage of the
// software, even if provoked by documentation provided together with
// the software.
//
// Any changes to this file according to the GPL as documented in the file
// gpl.txt aside this file in the shipment you received can be done to the
// lines that follows this copyright notice here, but changes must not be
// done inside the copyright notive above. A re-distribution must contain
// the intact and unchanged copyright notice.
// Contributions and changes to the program code must be marked as such.
//
//
// YACY stands for Yet Another CYberspace
//
// the yacySeed Object is the object that bundles and carries all information about
// a single peer in the yacy space.
// The yacySeed object is carried along peers using a string representation, that can
// be compressed and/or scrambled, depending on the purpose of the process.
//
// the yacy status
// any value that is defined here will be overwritten each time the proxy is started
// to prevent that the system gets confused, it should be set to "" which means
// undefined. Other status' that can be reached at run-time are
// junior - a peer that has no public socket, thus cannot be reached on demand
// senior - a peer that has a public socked and serves search queries
// principal - a peer like a senior socket and serves as gateway for network definition
package de.anomic.yacy;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import de.anomic.kelondro.kelondroBase64Order;
import de.anomic.net.natLib;
import de.anomic.plasma.plasmaSwitchboard;
import de.anomic.server.serverCodings;
import de.anomic.server.serverCore;
import de.anomic.server.serverDate;
import de.anomic.server.serverSystem;
import de.anomic.tools.bitfield;
import de.anomic.tools.crypt;
public class yacySeed {
/**
* <b>substance</b> "sI" (send index/words)
*/
public static final String INDEX_OUT = "sI";
/**
* <b>substance</b> "rI" (received index/words)
*/
public static final String INDEX_IN = "rI";
/**
* <b>substance</b> "sU" (send URLs)
*/
public static final String URL_OUT = "sU";
/**
* <b>substance</b> "rU" (received URLs)
*/
public static final String URL_IN = "rU";
/**
* <b>substance</b> "virgin"
*/
public static final String PEERTYPE_VIRGIN = "virgin";
/**
* <b>substance</b> "junior"
*/
public static final String PEERTYPE_JUNIOR = "junior";
/**
* <b>substance</b> "senior"
*/
public static final String PEERTYPE_SENIOR = "senior";
/**
* <b>substance</b> "principal"
*/
public static final String PEERTYPE_PRINCIPAL = "principal";
/**
* <b>substance</b> "PeerType"
*/
public static final String PEERTYPE = "PeerType";
public static final String IPTYPE = "IPType";
public static final String FLAGS = "Flags";
public static final String VERSION = "Version";
public static final String YOURTYPE = "yourtype";
public static final String LASTSEEN = "LastSeen";
public static final String USPEED = "USpeed";
public static final String NAME = "Name";
public static final String BDATE = "BDate";
public static final String UTC = "UTC";
public static final String ISPEED = "ISpeed";
public static final String UPTIME = "Uptime";
public static final String LCOUNT = "LCount";
public static final String NCOUNT = "NCount";
public static final String ICOUNT = "ICount";
public static final String SCOUNT = "SCount";
public static final String CCOUNT = "CCount"; // Connection Count
public static final String CRWCNT = "CRWCnt"; // Citation Rank (Own) - Count
public static final String CRTCNT = "CRTCnt"; // Citation Rank (Other) - Count
public static final String IP = "IP";
public static final String PORT = "Port";
public static final String YOURIP = "yourip";
public static final String MYTIME = "mytime";
public static final String SEED = "seed";
public static final String EQUAL = "=";
// class variables
public String hash;
private Map dna;
public int available;
public int selectscore = -1; // only for debugging
public yacySeed(String theHash, Map theDna) {
// create a seed with a pre-defined hash map
this.hash = theHash;
this.dna = theDna;
String flags = (String) this.dna.get(FLAGS);
if ((flags == null) || (flags.length() != 4)) this.dna.put(FLAGS, "____");
this.available = 0;
}
public yacySeed(String theHash) {
this.dna = new HashMap();
// settings that can only be computed by originating peer:
// at first startup -
this.hash = theHash; // the hash key of the peer - very important. should be static somehow, even after restart
this.dna.put(NAME, "&empty;"); // the name that the peer has given itself
this.dna.put(BDATE, "&empty;"); // birthdate - first startup
this.dna.put(UTC, "+0000");
// later during operation -
this.dna.put(ISPEED, "0"); // the speed of indexing (pages/minute) of the peer
this.dna.put(UPTIME, "0"); // the number of minutes that the peer is up in minutes/day (moving average MA30)
this.dna.put(LCOUNT, "0"); // the number of links that the peer has stored (LURL's)
this.dna.put(NCOUNT, "0"); // the number of links that the peer has noticed, but not loaded (NURL's)
this.dna.put(ICOUNT, "0"); // the number of words that the peer has indexed (as it says)
this.dna.put(SCOUNT, "0"); // the number of seeds that the peer has stored
this.dna.put(CCOUNT, "0"); // the number of clients that the peer connects (as connects/hour)
this.dna.put(VERSION, "0"); // the applications version
// settings that is created during the 'hello' phase - in first contact
this.dna.put(IP, ""); // 123.234.345.456
this.dna.put(PORT, "&empty;");
this.dna.put(PEERTYPE, PEERTYPE_VIRGIN); // virgin/junior/senior/principal
this.dna.put(IPTYPE, "&empty;"); // static/dynamic (if the ip changes often for any reason)
// settings that can only be computed by visiting peer
this.dna.put(LASTSEEN, yacyCore.universalDateShortString(new Date())); // for last-seen date
this.dna.put(USPEED, "0"); // the computated uplink speed of the peer
this.dna.put(CRWCNT, "0");
this.dna.put(CRTCNT, "0");
// settings that are needed to organize the seed round-trip
this.dna.put(FLAGS, "____");
setFlagDirectConnect(false);
setFlagAcceptRemoteCrawl(true);
setFlagAcceptRemoteIndex(true);
setFlagAcceptCitationReference(true);
setUnusedFlags();
// index transfer
this.dna.put(INDEX_OUT, "0"); // send index
this.dna.put(INDEX_IN, "0"); // received Index
this.dna.put(URL_OUT, "0"); // send url
this.dna.put(URL_IN, "0"); // received URL
this.available = 0;
}
public static String makeDefaultPeerName() {
// generate a default peer name
String name = serverCore.publicIP() + "-" + yacyCore.speedKey + "dpn" + serverSystem.infoKey() + (System.currentTimeMillis() & 99);
name = name.replace('.', '-');
name = name.replace('_', '-');
return name;
}
public static boolean isDefaultPeerName(String name) {
return ((name != null) && (name.length() > 10) && (name.charAt(0) <= '9') && (name.charAt(name.length() - 1) <= '9') && (name.indexOf("dpn") > 0));
}
/**
* try to get the IP<br>
* @return the IP or null
*/
public String getIP() { return get(IP, ""); }
/**
* try to get the peertype<br>
* @return the peertype or null
*/
public String getPeerType() { return get(PEERTYPE, ""); }
/**
* try to get the peertype<br>
* @return the peertype or "Virgin"
*/
public String orVirgin() { return get(PEERTYPE, PEERTYPE_VIRGIN); }
/**
* try to get the peertype<br>
* @return the peertype or "junior"
*/
public String orJunior() { return get(PEERTYPE, PEERTYPE_JUNIOR); }
/**
* try to get the peertype<br>
* @return the peertype or "senior"
*/
public String orSenior() { return get(PEERTYPE, PEERTYPE_SENIOR); }
/**
* try to get the peertype<br>
* @return the peertype or "principal"
*/
public String orPrincipal() { return get(PEERTYPE, PEERTYPE_PRINCIPAL); }
public String get(String key, String dflt) {
final Object o = this.dna.get(key);
if (o == null) { return dflt; }
return (String) o;
}
public void setIP() { put(IP, ""); }
public void setIP(String ip ) { put(IP, ip); }
public void setPort(String port) { put(PORT, port); }
public void setJunior() { put(PEERTYPE, PEERTYPE_JUNIOR); }
public void setSenior() { put(PEERTYPE, PEERTYPE_SENIOR); }
public void setPrincipal() { put(PEERTYPE, PEERTYPE_PRINCIPAL); }
public void setLastSeen() { put(LASTSEEN, yacyCore.shortFormatter.format(new Date(System.currentTimeMillis() + serverDate.UTCDiff() - getUTCDiff()))); }
public void put(String key, String value) {
synchronized(this.dna) {
this.dna.put(key, value);
}
}
public Map getMap() {
return this.dna;
}
public String getName() {
return get(NAME, "&empty;");
}
public String getHexHash() {
return b64Hash2hexHash(this.hash);
}
public void incSI(int count) {
String v = (String) this.dna.get(INDEX_OUT);
if (v == null) { v = "0"; }
put(INDEX_OUT, Integer.toString(Integer.parseInt(v) + count));
}
public void incRI(int count) {
String v = (String) this.dna.get(INDEX_IN);
if (v == null) { v = "0"; }
put(INDEX_IN, Integer.toString(Integer.parseInt(v) + count));
}
public void incSU(int count) {
String v = (String) this.dna.get(URL_OUT);
if (v == null) { v = "0"; }
put(URL_OUT, Integer.toString(Integer.parseInt(v) + count));
}
public void incRU(int count) {
String v = (String) this.dna.get(URL_IN);
if (v == null) { v = "0"; }
put(URL_IN, Integer.toString(Integer.parseInt(v) + count));
}
// 12 * 6 bit = 72 bit = 18 characters hex-hash
public static String b64Hash2hexHash(String b64Hash) {
// the hash string represents 12 * 6 bit = 72 bits. This is too much for a long integer.
return serverCodings.encodeHex(kelondroBase64Order.enhancedCoder.decode(b64Hash));
}
public static String hexHash2b64Hash(String hexHash) {
return kelondroBase64Order.enhancedCoder.encode(serverCodings.decodeHex(hexHash));
}
// 12 * 6 bit = 72 bit = 9 byte
public static byte[] b64Hash2b256Hash(String b64Hash) {
assert (b64Hash.length() == 12);
return kelondroBase64Order.enhancedCoder.decode(b64Hash);
}
public static String b256Hash2b64Hash(byte[] b256Hash) {
assert (b256Hash.length == 9);
return kelondroBase64Order.enhancedCoder.encode(b256Hash);
}
public float getVersion() {
try {
return Float.parseFloat(get(VERSION, "0"));
} catch (NumberFormatException e) {
return 0;
}
}
public String getAddress() {
final String ip = (String) this.dna.get(IP);
final String port = (String) this.dna.get(PORT);
if (ip != null && ip.length() >= 8 && port != null && port.length() >= 2) {
return ip + ":" + port;
}
return null;
}
public long getUTCDiff() {
String utc = (String) this.dna.get(UTC);
if (utc == null) { utc = "+0130"; }
try {
return serverDate.UTCDiff(utc);
} catch (RuntimeException e) {
return 0;
}
}
public long getLastSeenTime() {
try {
final long t = yacyCore.shortFormatter.parse(get(LASTSEEN, "20040101000000")).getTime();
// the problem here is: getTime applies a time shift according to local time zone:
// it substracts the local UTF offset, but it should subtract the remote UTC offset
// so we correct it by first adding the local UTF offset and then subtracting the remote
// the time zone was originally the seeds time zone
// we correct this here
return t - getUTCDiff() + serverDate.UTCDiff();
} catch (java.text.ParseException e) {
return System.currentTimeMillis();
} catch (java.lang.NumberFormatException e) {
return System.currentTimeMillis();
}
}
public int getAge() {
// returns the age as number of days
try {
final long t = yacyCore.shortFormatter.parse(get(BDATE, "20040101000000")).getTime();
return (int) ((System.currentTimeMillis() - (t - getUTCDiff() + serverDate.UTCDiff())) / 1000 / 60 / 60 / 24);
} catch (java.text.ParseException e) {
return -1;
} catch (java.lang.NumberFormatException e) {
return -1;
}
}
public void setLastSeenTime() {
// if we set a last seen time, then we need to respect the seeds UTC offset
put(LASTSEEN, yacyCore.shortFormatter.format(new Date(System.currentTimeMillis() - serverDate.UTCDiff() + getUTCDiff())));
}
public int getPPM() {
try {
return Integer.parseInt(get(ISPEED, "0"));
} catch (NumberFormatException e) {
return 0;
}
}
public long getLinkCount() {
try {
return Long.parseLong(get(LCOUNT, "0"));
} catch (NumberFormatException e) {
return 0;
}
}
private boolean getFlag(int flag) {
final String flags = get(FLAGS, "____");
return (new bitfield(flags.getBytes())).get(flag);
}
private void setFlag(int flag, boolean value) {
String flags = get(FLAGS, "____");
if (flags.length() != 4) flags = "____";
final bitfield f = new bitfield(flags.getBytes());
f.set(flag, value);
put(FLAGS, new String(f.getBytes()));
}
public void setFlagDirectConnect(boolean value) {setFlag(0, value);}
public void setFlagAcceptRemoteCrawl(boolean value) {setFlag(1, value);}
public void setFlagAcceptRemoteIndex(boolean value) {setFlag(2, value);}
public void setFlagAcceptCitationReference(boolean value) {setFlag(3, value);}
public boolean getFlagDirectConnect() {return getFlag(0);}
public boolean getFlagAcceptRemoteCrawl() {
//if (getVersion() < 0.300) return false;
//if (getVersion() < 0.334) return true;
return getFlag(1);
}
public boolean getFlagAcceptRemoteIndex() {
//if (getVersion() < 0.335) return false;
return getFlag(2);
}
public boolean getFlagAcceptCitationReference() {
return getFlag(3);
}
public void setUnusedFlags() {
for (int i = 4; i < 24; i++) setFlag(i, true);
}
public boolean isPotential() {
return isVirgin() || isJunior();
}
public boolean isVirgin() {
return get(PEERTYPE, "").equals(PEERTYPE_VIRGIN);
}
public boolean isJunior() {
return get(PEERTYPE, "").equals(PEERTYPE_JUNIOR);
}
public boolean isActive() {
return isSenior() || isPrincipal();
}
public boolean isSenior() {
return get(PEERTYPE, "").equals(PEERTYPE_SENIOR);
}
public boolean isPrincipal() {
return get(PEERTYPE, "").equals(PEERTYPE_PRINCIPAL);
}
public boolean isOnline() {
return (isSenior() || isPrincipal());
}
public boolean isOnline(String type) {
return (type.equals(PEERTYPE_SENIOR) || type.equals(PEERTYPE_PRINCIPAL));
}
public String encodeLex(long c, int length) {
if (length < 0) { length = 0; }
String s = "";
if (c == 0) {
s = '-' + s;
} else {
while (c > 0) {
s = ((char) (32 + (c % 96))) + s;
c = c / 96;
}
}
if (length != 0 && s.length() > length) {
throw new RuntimeException("encodeLex result '" + s + "' exceeds demanded length of " + length + " digits");
}
if (length == 0) { length = 1; } // rare exception for the case that c == 0
while (s.length() < length) { s = '-' + s; }
return s;
}
public static long decodeLex(String s) {
long c = 0;
for (int i = 0; i < s.length(); i++) {
c = c * 96 + (byte) s.charAt(i) - 32;
}
return c;
}
private static long maxLex(int len) {
// computes the maximum number that can be coded with a lex-encoded String of length len
long c = 0;
for (int i = 0; i < len; i++) {
c = c * 96 + 90;
}
return c;
}
private static long minLex(int len) {
// computes the minimum number that can be coded with a lex-encoded String of length len
long c = 0;
for (int i = 0; i < len; i++) {
c = c * 96 + 13;
}
return c;
}
public static final long minDHTNumber = minLex(9);
public static final long maxDHTDistance = maxLex(9) - minDHTNumber;
public long dhtDistance(String wordhash) {
// computes a virtual distance, the result must be set in relation to maxDHTDistace
// if the distance is small, this peer is more responsible for that word hash
// if the distance is big, this peer is less responsible for that word hash
final long myPos = decodeLex(this.hash.substring(0,9));
final long wordPos = decodeLex(wordhash.substring(0,9));
return (myPos > wordPos) ? (myPos - wordPos) : (myPos + maxDHTDistance - wordPos);
}
public long dhtPosition() {
// returns an absolute value
return dhtPosition(this.hash);
}
public static long dhtPosition(String ahash) {
// returns an absolute value
return decodeLex(ahash.substring(0,9)) - minDHTNumber;
}
public static yacySeed genLocalSeed(plasmaSwitchboard sb) {
// genera a seed for the local peer
// this is the birthplace of a seed, that then will start to travel to other peers
// at first we need a good peer hash
// that hash should be as static as possible, so that it depends mainly on system
// variables and can even then be reconstructed if the local seed has disappeared
final Properties sp = System.getProperties();
final String slow =
sp.getProperty("file.encoding", "") +
sp.getProperty("file.separator", "") +
sp.getProperty("java.class.path", "") +
sp.getProperty("java.vendor", "") +
sp.getProperty("os.arch", "") +
sp.getProperty("os.name", "") +
sp.getProperty("path.separator", "") +
sp.getProperty("user.dir", "") +
sp.getProperty("user.home", "") +
sp.getProperty("user.language", "") +
sp.getProperty("user.name", "") +
sp.getProperty("user.timezone", "");
final String medium =
sp.getProperty("java.class.version", "") +
sp.getProperty("java.version", "") +
sp.getProperty("os.version", "") +
sb.getConfig("peerName", "noname");
final String fast = Long.toString(System.currentTimeMillis());
// the resultinh hash does not have any information than can be used to reconstruct the
// original system information that has been collected here to create the hash
// We simply distinuguish three parts of the hash: slow, medium and fast changing character of system idenfification
// the Hash is constructed in such a way, that the slow part influences the main aerea of the distributed hash location
// more than the fast part. The effect is, that if the peer looses it's seed information and is reconstructed, it
// still hosts most information of the distributed hash the an appropriate 'position'
String hash =
kelondroBase64Order.enhancedCoder.encode(serverCodings.encodeMD5Raw(slow)).substring(0, 4) +
kelondroBase64Order.enhancedCoder.encode(serverCodings.encodeMD5Raw(medium)).substring(0, 4) +
kelondroBase64Order.enhancedCoder.encode(serverCodings.encodeMD5Raw(fast)).substring(0, 4);
yacyCore.log.logInfo("init: OWN SEED = " + hash);
if (hash.length() != yacySeedDB.commonHashLength) {
yacyCore.log.logSevere("YACY Internal error: distributed hash conceptual error");
System.exit(-1);
}
final yacySeed newSeed = new yacySeed(hash);
// now calculate other information about the host
newSeed.dna.put(NAME, sb.getConfig("peerName", "unnamed"));
if ((serverCore.portForwardingEnabled) && (serverCore.portForwarding != null)) {
newSeed.dna.put(PORT,Integer.toString(serverCore.portForwarding.getPort()));
} else {
newSeed.dna.put(PORT,Integer.toString(serverCore.getPortNr(sb.getConfig("port", "8080"))));
}
newSeed.dna.put(BDATE, yacyCore.universalDateShortString(new Date()));
newSeed.dna.put(LASTSEEN, newSeed.dna.get(BDATE)); // just as initial setting
newSeed.dna.put(UTC, serverDate.UTCDiffString());
newSeed.dna.put(PEERTYPE, PEERTYPE_VIRGIN);
return newSeed;
}
//public static String randomHash() { return "zLXFf5lTteUv"; } // only for debugging
public static String randomHash() {
String hash =
kelondroBase64Order.enhancedCoder.encode(serverCodings.encodeMD5Raw(System.currentTimeMillis() + "a")).substring(0, 6) +
kelondroBase64Order.enhancedCoder.encode(serverCodings.encodeMD5Raw(System.currentTimeMillis() + "b")).substring(0, 6);
return hash;
}
public static yacySeed genRemoteSeed(String seedStr, String key, boolean properTest) {
// this method is used to convert the external representation of a seed into a seed object
// yacyCore.log.logFinest("genRemoteSeed: seedStr=" + seedStr + " key=" + key);
if (seedStr == null) { return null; }
final String seed = crypt.simpleDecode(seedStr, key);
if (seed == null) { return null; }
final HashMap dna = serverCodings.string2map(seed);
final String hash = (String) dna.remove("Hash");
yacySeed resultSeed = new yacySeed(hash, dna);
if (properTest) {
String testResult = resultSeed.isProper();
if (testResult != null) {
yacyCore.log.logFinest("seed is not proper (" + testResult + "): " + resultSeed);
return null;
}
}
return resultSeed;
}
public String toString() {
synchronized (this.dna) {
this.dna.put("Hash", this.hash); // set hash into seed code structure
final String s = this.dna.toString(); // generate string representation
this.dna.remove("Hash"); // reconstruct original: hash is stored external
return s;
}
}
public String genSeedStr(String key) {
// use a default encoding
return genSeedStr('b', key);
}
synchronized public String genSeedStr(char method, String key) {
return crypt.simpleEncode(toString(), key, method);
}
public boolean isPeerOK() {
return (this.hash != null && isProper() == null);
}
public String isProper() {
// checks if everything is ok with that seed
if (this.hash == null) { return "hash is null"; }
if (this.hash.length() != yacySeedDB.commonHashLength) { return "wrong hash length (" + this.hash.length() + ")"; }
final String ip = (String) this.dna.get(IP);
if (ip == null) { return "IP is null"; }
if (ip.length() < 8) { return "IP is too short: " + ip; }
if (!natLib.isProper(ip)) { return "IP is not proper: " + ip; } //this does not work with staticIP
return null;
}
public void save(File f) throws IOException {
final String out = genSeedStr('p', null);
final FileWriter fw = new FileWriter(f);
fw.write(out, 0, out.length());
fw.close();
}
public static yacySeed load(File f) throws IOException {
final FileReader fr = new FileReader(f);
final char[] b = new char[(int) f.length()];
fr.read(b, 0, b.length);
fr.close();
return genRemoteSeed(new String(b), null, false);
}
public Object clone() {
synchronized(this.dna) {
return new yacySeed(this.hash, (HashMap) (new HashMap(this.dna)).clone());
}
}
/*
public static void main(String[] argv) {
try {
plasmaSwitchboard sb = new plasmaSwitchboard("../httpProxy.init", "../httpProxy.conf");
yacySeed ys = genLocalSeed(sb);
String yp, yz, yc;
System.out.println("YACY String = " + ys.toString());
System.out.println("YACY SeedStr/p = " + (yp = ys.genSeedStr('p', null)));
//System.out.println("YACY SeedStr/z = " + (yz = ys.genSeedStr('z', null)));
System.out.println("YACY SeedStr/c = " + (yc = ys.genSeedStr('c', "abc")));
System.out.println("YACY remote/p = " + genRemoteSeed(yp, null).toString());
//System.out.println("YACY remote/z = " + genRemoteSeed(yz, null).toString());
System.out.println("YACY remote/c = " + genRemoteSeed(yc, "abc").toString());
System.exit(0);
} catch (IOException e) {
e.printStackTrace();
}
}
*/
}
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