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/*
* Copyright (C) 2014 Andrew Comminos
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
package se.lublin.mumla.servers;
import android.os.AsyncTask;
import android.util.Log;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.nio.ByteBuffer;
import se.lublin.humla.model.Server;
import se.lublin.mumla.Constants;
/**
* Pings the requested server and returns a ServerInfoResponse.
* Will return a 'dummy' ServerInfoResponse in the case of failure.
* @author morlunk
*
*/
public class ServerInfoTask extends AsyncTask<Server, Void, ServerInfoResponse> {
private Server server;
@Override
protected ServerInfoResponse doInBackground(Server... params) {
server = params[0];
try {
InetAddress host = InetAddress.getByName(server.getHost());
// Create ping message
ByteBuffer buffer = ByteBuffer.allocate(12);
buffer.putInt(0); // Request type
buffer.putLong(server.getId()); // Identifier
// TODO SRV use looked up port here.
DatagramPacket requestPacket = new DatagramPacket(buffer.array(), 12, host, server.getPort());
// Send packet and wait for response
DatagramSocket socket = new DatagramSocket();
socket.setSoTimeout(1000);
socket.setReceiveBufferSize(1024);
long startTime = System.nanoTime();
socket.send(requestPacket);
byte[] responseBuffer = new byte[24];
DatagramPacket responsePacket = new DatagramPacket(responseBuffer, responseBuffer.length);
socket.receive(responsePacket);
int latencyInMs = (int) ((System.nanoTime()-startTime)/1000000);
ServerInfoResponse response = new ServerInfoResponse(server, responseBuffer, latencyInMs);
Log.i(Constants.TAG, "DEBUG: Server version: "+response.getVersionString()+"\nUsers: "+response.getCurrentUsers()+"/"+response.getMaximumUsers());
return response;
} catch (Exception e) {
// e.printStackTrace();
}
return new ServerInfoResponse(); // Return dummy in case of failure
}
}
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