/*
* Copyright (c) [2016] [ <ether.camp> ]
* This file is part of the ethereumJ library.
*
* The ethereumJ library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ethereumJ library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the ethereumJ library. If not, see <http://www.gnu.org/licenses/>.
*/
package org.ethereum.net.rlpx.discover;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.socket.DatagramPacket;
import org.ethereum.crypto.ECKey;
import org.ethereum.net.rlpx.FindNodeMessage;
import org.ethereum.net.rlpx.Message;
import org.ethereum.net.rlpx.Node;
import org.ethereum.net.rlpx.discover.table.KademliaOptions;
import org.ethereum.net.rlpx.discover.table.NodeEntry;
import org.ethereum.net.rlpx.discover.table.NodeTable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.List;
public class DiscoverTask implements Runnable {
private static final Logger logger = LoggerFactory.getLogger("discover");
NodeManager nodeManager;
byte[] nodeId;
public DiscoverTask(NodeManager nodeManager) {
this.nodeManager = nodeManager;
nodeId = nodeManager.homeNode.getId();
}
@Override
public void run() {
discover(nodeId, 0, new ArrayList<Node>());
}
public synchronized void discover(byte[] nodeId, int round, List<Node> prevTried) {
try {
// if (!channel.isOpen() || round == KademliaOptions.MAX_STEPS) {
// logger.info("{}", String.format("Nodes discovered %d ", table.getAllNodes().size()));
// return;
// }
if (round == KademliaOptions.MAX_STEPS) {
logger.debug("Node table contains [{}] peers", nodeManager.getTable().getNodesCount());
logger.debug("{}", String.format("(KademliaOptions.MAX_STEPS) Terminating discover after %d rounds.", round));
logger.trace("{}\n{}", String.format("Nodes discovered %d ", nodeManager.getTable().getNodesCount()), dumpNodes());
return;
}
List<Node> closest = nodeManager.getTable().getClosestNodes(nodeId);
List<Node> tried = new ArrayList<>();
for (Node n : closest) {
if (!tried.contains(n) && !prevTried.contains(n)) {
try {
nodeManager.getNodeHandler(n).sendFindNode(nodeId);
tried.add(n);
Thread.sleep(50);
}catch (InterruptedException e) {
} catch (Exception ex) {
logger.error("Unexpected Exception " + ex, ex);
}
}
if (tried.size() == KademliaOptions.ALPHA) {
break;
}
}
// channel.flush();
if (tried.isEmpty()) {
logger.debug("{}", String.format("(tried.isEmpty()) Terminating discover after %d rounds.", round));
logger.trace("{}\n{}", String.format("Nodes discovered %d ", nodeManager.getTable().getNodesCount()), dumpNodes());
return;
}
tried.addAll(prevTried);
discover(nodeId, round + 1, tried);
} catch (Exception ex) {
logger.info("{}", ex);
}
}
private String dumpNodes() {
String ret = "";
for (NodeEntry entry : nodeManager.getTable().getAllNodes()) {
ret += " " + entry.getNode() + "\n";
}
return ret;
}
}