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/*
This file is part of GNUnet.
Copyright (C) 2012, 2013 Christian Grothoff (and other contributing authors)
GNUnet 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 3, or (at your
option) any later version.
GNUnet 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 GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
package org.gnunet.gns;
import org.gnunet.gns.messages.ClientLookupMessage;
import org.gnunet.gns.messages.ClientLookupResultMessage;
import org.gnunet.requests.FixedMessageRequest;
import org.gnunet.requests.MatchingRequestContainer;
import org.gnunet.requests.RequestIdentifier;
import org.gnunet.util.*;
import org.gnunet.util.crypto.EcdsaPrivateKey;
import org.gnunet.util.crypto.EcdsaPublicKey;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* API to the GNUnet name system.
*/
public class Gns {
private static final Logger logger = LoggerFactory
.getLogger(Gns.class);
/**
* Defaults, look in cache, then in DHT.
*/
public static final int LOOKUP_OPTION_DEFAULT = 0;
/**
* Never look in the DHT, keep request to local cache.
*/
public static final int LOOKUP_OPTION_NO_DHT = 1;
/**
* For the rightmost label, only look in the cache (it
* is our master zone), for the others, the DHT is OK.
*/
public static final int LOOKUP_OPTION_LOCAL_MASTER = 2;
/**
* All pending and active lookup requests.
*/
private MatchingRequestContainer<Long, FixedMessageRequest<LookupResultProcessor>> lookupRequests;
/**
* Request ID for lookup requests.
*/
private long nextUID = 1;
/**
* Client connected to the GNS service.
*/
private Client client;
private RelativeTime reconnectBackoff = RelativeTime.STD_BACKOFF;
public class GNSMessageReceiver extends RunaboutMessageReceiver {
public void visit(ClientLookupResultMessage m) {
RequestIdentifier<FixedMessageRequest<LookupResultProcessor>> r = lookupRequests.getRequestIdentifier(m.id);
if (null == r) {
logger.warn("no matching getRequestIdentifier for lookup result");
return;
}
r.getRequest().getContext().process(m.records);
}
@Override
public void handleError() {
logger.warn("Error receiving from GNS service, reconnecting.");
Scheduler.addDelayed(reconnectBackoff, new Scheduler.Task() {
@Override
public void run(Scheduler.RunContext ctx) {
client.reconnect();
// re-send active requests
lookupRequests.restart();
}
});
reconnectBackoff = reconnectBackoff.backoff();
}
}
/**
* Connect to the GNS service
*
* @param cfg configuration to use
*/
public Gns(Configuration cfg) {
client = new Client("gns", cfg);
lookupRequests = new MatchingRequestContainer<Long, FixedMessageRequest<LookupResultProcessor>>(client);
client.installReceiver(new GNSMessageReceiver());
}
/**
* Perform an asynchronous lookup operation on the GNS.
*
* @param name the name to look up
* @param zone zone to look in
* @param type the GNS record type to look for
* @param lookupOption a Gns.LOOKUP_OPTION_* value
* @param shortenZoneKey the private key of the shorten zone (can be NULL);
* specify to enable automatic shortening (given a PSEU
* record, if a given pseudonym is not yet used in the
* shorten zone, we automatically add the respective zone
* under that name)
* @param proc function to call on result
* @return handle to the queued getRequestIdentifier
*/
public Cancelable lookup(String name,
EcdsaPublicKey zone,
long type, int lookupOption,
EcdsaPrivateKey shortenZoneKey,
LookupResultProcessor proc) {
ClientLookupMessage m = new ClientLookupMessage();
if (null != shortenZoneKey) {
m.haveKey = 1;
m.shortenKey = shortenZoneKey;
} else {
m.haveKey = 0;
m.shortenKey = EcdsaPrivateKey.zeroKey();
}
m.id = nextUID++;
m.name = name;
m.onlyCached = lookupOption;
m.type = type;
m.zone = zone;
return lookupRequests.addRequest(m.id, new FixedMessageRequest<LookupResultProcessor>(m, proc));
}
/**
* Disconnect from the GNS service.
*/
public void disconnect() {
client.disconnect();
client = null;
}
}
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