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223 lines
12 KiB
223 lines
12 KiB
// 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.indexRWIEntry;
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import de.anomic.index.indexRWIEntryOld;
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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.yacyDHTAction;
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import de.anomic.yacy.yacySeed;
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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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indexRWIEntry 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 indexRWIEntryOld(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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