// transferRWI.java
// -----------------------
// part of the AnomicHTTPD caching proxy
// (C) by Michael Peter Christen; mc@yacy.net
// first published on http://www.anomic.de
// Frankfurt, Germany, 2004, 2005
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// 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
// You must compile this file with
// javac -classpath .:../classes transferRWI.java
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import net.yacy.cora.document.encoding.ASCII;
import net.yacy.cora.document.encoding.UTF8;
import net.yacy.cora.document.feed.RSSMessage;
import net.yacy.cora.federate.yacy.Distribution;
import net.yacy.cora.protocol.HeaderFramework;
import net.yacy.cora.protocol.RequestHeader;
import net.yacy.cora.storage.HandleSet;
import net.yacy.cora.util.ConcurrentLog;
import net.yacy.cora.util.Memory;
import net.yacy.cora.util.SpaceExceededException;
import net.yacy.kelondro.data.word.Word;
import net.yacy.kelondro.data.word.WordReferenceRow;
import net.yacy.kelondro.index.RowHandleSet;
import net.yacy.kelondro.util.FileUtils;
import net.yacy.kelondro.util.MemoryControl;
import net.yacy.peers.EventChannel;
import net.yacy.peers.Network;
import net.yacy.peers.Protocol;
import net.yacy.peers.Seed;
import net.yacy.repository.Blacklist.BlacklistType;
import net.yacy.search.Switchboard;
import net.yacy.search.SwitchboardConstants;
import net.yacy.server.serverObjects;
import net.yacy.server.serverSwitch;
public final class transferRWI {
public static serverObjects respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
// return variable that accumulates replacements
final Switchboard sb = (Switchboard) env;
// remember the peer contact for peer statistics
final String clientip = header.getRemoteAddr();
final String userAgent = header.get(HeaderFramework.USER_AGENT, "<unknown>");
if (clientip != null) sb.peers.peerActions.setUserAgent(clientip, userAgent);
final serverObjects prop = new serverObjects();
final String contentType = header.getContentType();
prop.put("unknownURL", "");
prop.put("pause", 60000);
String result = "";
if ((post == null) || (env == null)) {
result = "post or env is null!";
logWarning(contentType, result);
prop.put("result", result);
return prop;
}
if (!Protocol.authentifyRequest(post, env)) {
result = "not authentified";
prop.put("result", result);
return prop;
}
if (!post.containsKey("wordc")) {
result = "missing wordc";
prop.put("result", result);
return prop;
}
if (!post.containsKey("entryc")) {
result = "missing entryc";
prop.put("result", result);
return prop;
}
if (!post.containsKey("indexes")) {
result = "missing indexes";
prop.put("result", result);
return prop;
}
// load tests
if (Memory.load() > 2.0 || MemoryControl.shortStatus()) {
// check also Protocol.metadataRetrievalRunning.get() > 0 ?
result = "too high load"; // don't tell too much details
prop.put("result", result);
return prop;
}
// request values
final String iam = post.get("iam", ""); // seed hash of requester
final String youare = post.get("youare", ""); // seed hash of the target peer, needed for network stability
// final String key = (String) post.get("key", ""); // transmission key
final int wordc = post.getInt("wordc", 0); // number of different words
final int entryc = post.getInt("entryc", 0); // number of entries in indexes
byte[] indexes = post.get("indexes", "").getBytes(); // the indexes, as list of word entries
boolean granted = sb.getConfigBool(SwitchboardConstants.INDEX_RECEIVE_ALLOW, false);
final boolean blockBlacklist = sb.getConfigBool(SwitchboardConstants.INDEX_RECEIVE_BLOCK_BLACKLIST, false);
final long cachelimit = sb.getConfigLong(SwitchboardConstants.WORDCACHE_MAX_COUNT, 100000);
final Seed otherPeer = sb.peers.get(iam);
final String otherPeerName = iam + ":" + ((otherPeer == null) ? "NULL" : (otherPeer.getName() + "/" + otherPeer.getVersion()));
// response values
int pause = 0;
result = "ok";
final StringBuilder unknownURLs = new StringBuilder(6000);
double load = Memory.load();
float maxload = sb.getConfigFloat(SwitchboardConstants.INDEX_DIST_LOADPREREQ, 2.0f);
if (load > maxload) {
// too high local load. this is bad but we must reject this to protect ourself!
sb.getLog().info("Rejecting RWIs from peer " + otherPeerName + ", system has too high load = " + load + ", maxload = " + maxload);
result = "not_granted";
pause = (int) (load * 20000);
} else if ((youare == null) || (!youare.equals(sb.peers.mySeed().hash))) {
sb.getLog().info("Rejecting RWIs from peer " + otherPeerName + ". Wrong target. Wanted peer=" + youare + ", iam=" + sb.peers.mySeed().hash);
result = "wrong_target";
pause = 0;
} else if (otherPeer == null) {
// we dont want to receive indexes
sb.getLog().info("Rejecting RWIs from peer " + otherPeerName + ". Not granted. Other Peer is unknown");
result = "not_granted";
pause = 60000;
} else if (!granted) {
// we dont want to receive indexes
sb.getLog().info("Rejecting RWIs from peer " + otherPeerName + ". Granted is false");
result = "not_granted";
pause = 60000;
} else if (sb.isRobinsonMode()) {
// we dont want to receive indexes
sb.getLog().info("Rejecting RWIs from peer " + otherPeerName + ". Not granted. This peer is in robinson mode");
result = "not_granted";
pause = 60000;
} else if (sb.index.RWIBufferCount() > cachelimit) {
// we are too busy to receive indexes
sb.getLog().info("Rejecting RWIs from peer " + otherPeerName + ". We are too busy (buffersize=" + sb.index.RWIBufferCount() + ").");
granted = false; // don't accept more words if there are too many words to flush
result = "busy";
pause = 60000;
} else if (otherPeer.getVersion() < 0.75005845 && otherPeer.getVersion() >= 0.75005821) {
// version that sends [B@... hashes
sb.getLog().info("Rejecting RWIs from peer " + otherPeerName + ". Bad version.");
result = "not_granted";
pause = 1800000;
} else {
// we want and can receive indexes
// log value status (currently added to find outOfMemory error
if (sb.getLog().isFine()) sb.getLog().fine("Processing " + indexes.length + " bytes / " + wordc + " words / " + entryc + " entries from " + otherPeerName);
final long startProcess = System.currentTimeMillis();
// decode request
//System.out.println("STRINGS " + UTF8.String(indexes));
final Iterator<String> it = FileUtils.strings(indexes);
// free memory
indexes = null;
// now parse the Strings in the value-vector and write index entries
String estring;
int p;
String wordHash;
byte[] urlHash;
WordReferenceRow iEntry;
final HandleSet unknownURL = new RowHandleSet(Word.commonHashLength, Word.commonHashOrder, 0);
final ArrayList<String> wordhashes = new ArrayList<String>();
int received = 0;
int blocked = 0;
int count = 0;
Set<String> testids = new HashSet<String>();
while (it.hasNext()) {
estring = it.next();
count++;
if (count > 1000) break; // protection against flooding
// check if RWI entry is well-formed
p = estring.indexOf('{',0);
if (p < 0 || estring.indexOf("x=",0) < 0 || !(estring.indexOf("[B@",0) < 0)) {
blocked++;
continue;
}
wordHash = estring.substring(0, p);
wordhashes.add(wordHash);
iEntry = new WordReferenceRow(estring.substring(p));
urlHash = iEntry.urlhash();
// block blacklisted entries
if ((blockBlacklist) && (Switchboard.urlBlacklist.hashInBlacklistedCache(BlacklistType.DHT, urlHash))) {
Network.log.fine("transferRWI: blocked blacklisted URLHash '" + ASCII.String(urlHash) + "' from peer " + otherPeerName);
blocked++;
continue;
}
// check if the entry is in our network domain
final String urlRejectReason = sb.crawlStacker.urlInAcceptedDomainHash(urlHash);
if (urlRejectReason != null) {
Network.log.warn("transferRWI: blocked URL hash '" + ASCII.String(urlHash) + "' (" + urlRejectReason + ") from peer " + otherPeerName + "; peer is suspected to be a spam-peer (or something is wrong)");
//if (yacyCore.log.isFine()) yacyCore.log.logFine("transferRWI: blocked URL hash '" + urlHash + "' (" + urlRejectReason + ") from peer " + otherPeerName);
blocked++;
continue;
}
// learn entry
try {
sb.index.storeRWI(ASCII.getBytes(wordHash), iEntry);
} catch (final Exception e) {
ConcurrentLog.logException(e);
}
// check if we need to ask for the corresponding URL
testids.add(ASCII.String(urlHash));
received++;
}
for (String id: testids) {
try {
try {
if (sb.index.fulltext().getLoadTime(id) < 0) {
unknownURL.put(ASCII.getBytes(id));
}
} catch (IOException e) {
ConcurrentLog.logException(e);
unknownURL.put(ASCII.getBytes(id));
}
} catch (final SpaceExceededException e) {
sb.getLog().warn("transferRWI: DB-Error while trying to determine if URL with hash '" + id + "' is known.", e);
}
}
sb.peers.mySeed().incRI(received);
// finally compose the unknownURL hash list
final Iterator<byte[]> bit = unknownURL.iterator();
unknownURLs.ensureCapacity(unknownURL.size() * 25);
while (bit.hasNext()) {
unknownURLs.append(UTF8.String(bit.next())).append(',');
}
if (unknownURLs.length() > 0) { unknownURLs.setLength(unknownURLs.length() - 1); }
if (wordhashes.isEmpty() || received == 0) {
sb.getLog().info("Received 0 RWIs from " + otherPeerName + ", processed in " + (System.currentTimeMillis() - startProcess) + " milliseconds, requesting " + unknownURL.size() + " URLs, blocked " + blocked + " RWIs");
} else {
final String firstHash = wordhashes.get(0);
final String lastHash = wordhashes.get(wordhashes.size() - 1);
final long avdist = (Distribution.horizontalDHTDistance(firstHash.getBytes(), ASCII.getBytes(sb.peers.mySeed().hash)) + Distribution.horizontalDHTDistance(lastHash.getBytes(), ASCII.getBytes(sb.peers.mySeed().hash))) / 2;
sb.getLog().info("Received " + received + " RWIs, " + wordc + " Words [" + firstHash + " .. " + lastHash + "], processed in " + (System.currentTimeMillis() - startProcess) + " milliseconds, " + avdist + ", blocked " + blocked + ", requesting " + unknownURL.size() + "/" + received+ " URLs from " + otherPeerName);
EventChannel.channels(EventChannel.DHTRECEIVE).addMessage(new RSSMessage("Received " + received + " RWIs, " + wordc + " Words [" + firstHash + " .. " + lastHash + "], processed in " + (System.currentTimeMillis() - startProcess) + " milliseconds, " + avdist + ", blocked " + blocked + ", requesting " + unknownURL.size() + "/" + received + " URLs from " + otherPeerName, "", otherPeer.hash));
}
result = "ok";
pause = (int) (sb.index.RWIBufferCount() * 20000 / sb.getConfigLong(SwitchboardConstants.WORDCACHE_MAX_COUNT, 100000)); // estimation of necessary pause time
}
prop.put("unknownURL", unknownURLs.toString());
prop.put("result", result);
prop.put("pause", pause);
// return rewrite properties
return prop;
}
/**
* @param requestIdentifier
* @param msg
*/
private static void logWarning(final String requestIdentifier, final String msg) {
ConcurrentLog.warn("transferRWI", requestIdentifier +" "+ msg);
}
}