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c89d8142bb
there are now two full-controlled caches for incoming indexes: - dhtIn - dhtOut during indexing, all indexes that shall not be transported to remote peers because they belong to the own peer are stored to dhtIn. It is furthermore ensured that received indexes are not again transmitted to other peers directly. They may, however be transmitted later if the network grows. git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@2574 6c8d7289-2bf4-0310-a012-ef5d649a1542
223 lines
12 KiB
Java
223 lines
12 KiB
Java
// transferRWI.java
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// -----------------------
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// part of the AnomicHTTPD caching proxy
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2004, 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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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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// You must compile this file with
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// javac -classpath .:../classes transferRWI.java
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.LinkedList;
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import de.anomic.http.httpHeader;
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import de.anomic.index.indexEntry;
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import de.anomic.index.indexURLEntry;
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import de.anomic.plasma.plasmaSwitchboard;
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import de.anomic.plasma.urlPattern.plasmaURLPattern;
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import de.anomic.server.serverCore;
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import de.anomic.server.serverObjects;
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import de.anomic.server.serverSwitch;
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import de.anomic.yacy.yacyCore;
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import de.anomic.yacy.yacySeed;
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import de.anomic.yacy.yacyDHTAction;
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public final class transferRWI {
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public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch ss) throws InterruptedException {
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if (post == null || ss == null) { return null; }
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// return variable that accumulates replacements
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final plasmaSwitchboard sb = (plasmaSwitchboard) ss;
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final serverObjects prop = new serverObjects();
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if (prop == null || sb == null) { return null; }
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// request values
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final String iam = post.get("iam", ""); // seed hash of requester
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// final String youare = (String) post.get("youare", ""); // seed hash of the target peer, needed for network stability
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// final String key = (String) post.get("key", ""); // transmission key
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final int wordc = Integer.parseInt(post.get("wordc", "")); // number of different words
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final int entryc = Integer.parseInt(post.get("entryc", "")); // number of entries in indexes
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byte[] indexes = post.get("indexes", "").getBytes(); // the indexes, as list of word entries
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boolean granted = sb.getConfig("allowReceiveIndex", "false").equals("true");
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boolean blockBlacklist = sb.getConfig("indexReceiveBlockBlacklist", "false").equals("true");
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boolean checkLimit = sb.getConfigBool("indexDistribution.transferRWIReceiptLimitEnabled", true);
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final long cachelimit = sb.getConfigLong("indexDistribution.dhtReceiptLimit", 1000);
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final yacySeed otherPeer = yacyCore.seedDB.get(iam);
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final String otherPeerName = iam + ":" + ((otherPeer == null) ? "NULL" : (otherPeer.getName() + "/" + otherPeer.getVersion()));
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// response values
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String result = "ok";
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StringBuffer unknownURLs = new StringBuffer();
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int pause = 0;
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boolean shortCacheFlush = false;
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if ((granted) && (sb.wordIndex.busyCacheFlush)) {
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// wait a little bit, maybe we got into a short flush slot
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for (int i = 0; i < 20; i++) {
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if (!(sb.wordIndex.busyCacheFlush)) {
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shortCacheFlush = true;
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break;
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}
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try {Thread.sleep(100);} catch (InterruptedException e) {/* */}
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}
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}
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if (!granted) {
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// we dont want to receive indexes
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sb.getLog().logInfo("Rejecting RWIs from peer " + otherPeerName + ". Not granted.");
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result = "not_granted";
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pause = 0;
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} else if (checkLimit && sb.wordIndex.dhtInCacheSize() > cachelimit) {
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// we are too busy to receive indexes
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sb.getLog().logInfo("Rejecting RWIs from peer " + otherPeerName + ". We are too busy (buffersize=" + sb.wordIndex.dhtInCacheSize() + ").");
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granted = false; // don't accept more words if there are too many words to flush
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result = "busy";
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pause = 60000;
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} else if ((checkLimit && sb.wordIndex.dhtOutCacheSize() > sb.getConfigLong("wordCacheMaxCount", 20000)) || ((sb.wordIndex.busyCacheFlush) && (!shortCacheFlush))) {
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// we are too busy flushing the ramCache to receive indexes
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sb.getLog().logInfo("Rejecting RWIs from peer " + otherPeerName + ". We are too busy (wordcachesize=" + sb.wordIndex.dhtOutCacheSize() + ").");
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granted = false; // don't accept more words if there are too many words to flush
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result = "busy";
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pause = 300000;
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} else {
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// we want and can receive indexes
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// log value status (currently added to find outOfMemory error
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sb.getLog().logFine("Processing " + indexes.length + " bytes / " + wordc + " words / " + entryc + " entries from " + otherPeerName);
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final long startProcess = System.currentTimeMillis();
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// decode request
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final LinkedList v = new LinkedList();
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int s = 0;
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int e;
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while (s < indexes.length) {
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e = s; while (e < indexes.length) if (indexes[e++] < 32) {e--; break;}
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if ((e - s) > 0) v.add(new String(indexes, s, e - s));
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s = e; while (s < indexes.length) if (indexes[s++] >= 32) {s--; break;}
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}
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// free memory
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indexes = null;
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// the value-vector should now have the same length as entryc
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if (v.size() != entryc) sb.getLog().logSevere("ERROR WITH ENTRY COUNTER: v=" + v.size() + ", entryc=" + entryc);
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// now parse the Strings in the value-vector and write index entries
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String estring;
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int p;
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String wordHash;
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String urlHash;
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indexEntry iEntry;
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int wordhashesSize = v.size();
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final HashSet unknownURL = new HashSet();
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final HashSet knownURL = new HashSet();
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String[] wordhashes = new String[v.size()];
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int received = 0;
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int blocked = 0;
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int receivedURL = 0;
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for (int i = 0; i < wordhashesSize; i++) {
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serverCore.checkInterruption();
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estring = (String) v.removeFirst();
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p = estring.indexOf("{");
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if (p > 0) {
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wordHash = estring.substring(0, p);
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wordhashes[received] = wordHash;
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iEntry = new indexURLEntry(estring.substring(p));
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urlHash = iEntry.urlHash();
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if ((blockBlacklist) && (plasmaSwitchboard.urlBlacklist.hashInBlacklistedCache(plasmaURLPattern.BLACKLIST_DHT, urlHash))) {
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int deleted = sb.wordIndex.tryRemoveURLs(urlHash);
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yacyCore.log.logFine("transferRWI: blocked blacklisted URLHash '" + urlHash + "' from peer " + otherPeerName + "; deleted " + deleted + " URL entries from RWIs");
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blocked++;
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} else {
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sb.wordIndex.addEntry(wordHash, iEntry, System.currentTimeMillis(), true);
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serverCore.checkInterruption();
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if (!(knownURL.contains(urlHash)||unknownURL.contains(urlHash))) {
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try {
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if (sb.urlPool.loadedURL.exists(urlHash)) {
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knownURL.add(urlHash);
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} else {
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unknownURL.add(urlHash);
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}
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} catch (Exception ex) {
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sb.getLog().logWarning(
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"transferRWI: DB-Error while trying to determine if URL with hash '" +
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urlHash + "' is known.", ex);
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}
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receivedURL++;
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}
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received++;
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}
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}
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}
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yacyCore.seedDB.mySeed.incRI(received);
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// finally compose the unknownURL hash list
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final Iterator it = unknownURL.iterator();
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unknownURLs.ensureCapacity(unknownURL.size()*13);
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while (it.hasNext()) {
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unknownURLs.append(",").append((String) it.next());
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}
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if (unknownURLs.length() > 0) { unknownURLs.delete(0, 1); }
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if (wordhashes.length == 0) {
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sb.getLog().logInfo("Received 0 RWIs from " + otherPeerName + ", processed in " + (System.currentTimeMillis() - startProcess) + " milliseconds, requesting " + unknownURL.size() + " URLs");
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} else {
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final double avdist = (yacyDHTAction.dhtDistance(yacyCore.seedDB.mySeed.hash, wordhashes[0]) + yacyDHTAction.dhtDistance(yacyCore.seedDB.mySeed.hash, wordhashes[received - 1])) / 2.0;
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sb.getLog().logInfo("Received " + received + " Entries " + wordc + " Words [" + wordhashes[0] + " .. " + wordhashes[received - 1] + "]/" + avdist + " from " + otherPeerName + ", processed in " + (System.currentTimeMillis() - startProcess) + " milliseconds, requesting " + unknownURL.size() + "/" + receivedURL + " URLs, blocked " + blocked + " RWIs");
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}
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result = "ok";
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if (checkLimit) {
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pause = (sb.wordIndex.dhtInCacheSize() < 500) ? 0 : 60 * sb.wordIndex.dhtInCacheSize(); // estimation of necessary pause time
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}
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}
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prop.put("unknownURL", unknownURLs.toString());
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prop.put("result", result);
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prop.put("pause", Integer.toString(pause));
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// return rewrite properties
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return prop;
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}
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}
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