private void listen() throws Exception {
System.out.println("Listening on port: " + serverPort);
// Initialize socket
socket = new DatagramSocket(serverPort);
// While running
while (run) {
// Wait for handshake
packet = new DatagramPacket(response, response.length);
socket.receive(packet); // Blocking
// System.out.println("RT: got packet");
Packet p = new Packet(packet.getData());
if (p.isHandshake()) {
// System.out.println("RT: is handshake");
// Get client connection info
InetAddress IPAddress = packet.getAddress();
int port = packet.getPort();
// Process handshake
processHandshake(p, IPAddress, port);
// Get message
MyMessage message = getMessage();
if (message != null) {
rc.rreceive(message);
}
}
}
}
public void run() {
boolean gotByePacket = false;
try {
/* stream to read from client */
ObjectInputStream fromClient = new ObjectInputStream(socket.getInputStream());
Packet packetFromClient;
/* stream to write back to client */
ObjectOutputStream toClient = new ObjectOutputStream(socket.getOutputStream());
// writer to the disk
// String file = "list";
// while (( packetFromClient = (Packet) fromClient.readObject()) != null) {
/* create a packet to send reply back to client */
packetFromClient = (Packet) fromClient.readObject();
Packet packetToClient = new Packet();
packetToClient.type = Packet.LOOKUP_REPLY;
packetToClient.data = new ArrayList<String>();
if (packetFromClient.type == Packet.LOOKUP_REQUEST) {
// called by client
System.out.println("Request from Client:" + packetFromClient.type);
packetToClient.type = Packet.LOOKUP_REPLY;
long start = packetFromClient.start;
long length = packetFromClient.length;
if (start > dict.size()) {
// set the error field, return
packetToClient.error_code = Packet.ERROR_OUT_OF_RANGE;
} else {
for (int i = (int) start; i < start + length && i < dict.size(); i++) {
packetToClient.data.add(dict.get(i));
}
}
toClient.writeObject(packetToClient);
// continue;
}
// }
/* cleanup when client exits */
fromClient.close();
toClient.close();
socket.close();
// close the filehandle
} catch (IOException e) {
if (!gotByePacket) {
e.printStackTrace();
}
} catch (ClassNotFoundException e) {
if (!gotByePacket) e.printStackTrace();
}
}
private boolean sendAck(Packet p, DatagramPacket dp) {
// Respond
// System.out.println("RT: Sending ack for packet w/ seqnum: " + p.getSeqNum());
Packet hsp = new Packet(p.getSeqNum());
hsp.assembleHandshakePacket();
packet =
new DatagramPacket(hsp.getPacketData(), hsp.getPacketSize(), dp.getAddress(), dp.getPort());
try {
socket.send(packet);
} catch (Exception e) {
System.out.println("RT: Could not send ack packet:\n" + e.getMessage());
return false;
}
return true;
}
private MyMessage getMessage() throws Exception {
int dataRecieved = 0;
String m = new String();
String t;
// FIXME needs to get multiple packets and messages
// System.out.println("RT: Now waiting for message data");
while (dataRecieved < totalDataSize) {
// Get message data
response = new byte[65000];
DatagramPacket packet = new DatagramPacket(response, response.length);
socket.receive(packet);
Packet p = new Packet(packet.getData());
// System.out.println("RT: Got message with seqnum: "+p.getSeqNum());
// If we have a handshake packet something broke
if (p.isHandshake()) {
return null;
}
// If next in-order packet grab data and is not corrupt
// XXX
if (p.getSeqNum() == seqNum + 1 && p.checkChecksum()) {
// Get the message ( part? )
// System.out.println("RT: Is correct seqnum");
t = p.getMessages().get(0).getMessageContents();
// System.out.println("RT: Got message packet: " + t);
m += t;
// Send ack
sendAck(p, packet);
// Increment counters
dataRecieved += t.length();
seqNum++;
} else {
System.out.println("RT: Is NOT correct seqnum");
}
}
MyMessage result = new MyMessage();
result.setMessageContents(m);
return result;
}
private String getFriendsMessage(Packet packet) {
ArrayList<String> friends = new ArrayList<String>();
friends = server.getfriendlist(packet.getSender());
String friendsMessage = "";
// Prepare delimited list to send to sender
for (int i = 0; i < friends.size(); i++) {
friendsMessage = friendsMessage + friends.get(i) + ":";
}
return friendsMessage;
}
private int processHandshake(Packet p, InetAddress ip, int port) throws Exception {
// System.out.println("Got handshake");
// Get connection information
this.numMessages = p.getNumMessages();
this.totalDataSize = p.getTotalDataLength();
this.seqNum = p.getSeqNum();
// Respond
// System.out.println("RT: Sending handshake response");
Packet hsp = new Packet(seqNum);
hsp.assembleHandshakePacket();
packet = new DatagramPacket(hsp.getPacketData(), hsp.getPacketSize(), ip, port);
socket.send(packet);
// System.out.println("RT: Done with handshake:\n\tStarting seqnum: "+seqNum+"\n\tTotal datalen:
// "+totalDataSize);
return 1; // FIXME p.getNumMessages();
}
public void run() {
ObjectInputStream din = null;
try {
din = new ObjectInputStream(socket.getInputStream());
Packet packet = (Packet) din.readObject();
username = packet.getSender();
server.usernameSocketMapping.put(username, socket);
server.isAlive.add(username);
// Sh: Login validation message
if (packet.getType() == 0) {
try {
String password = packet.getMessage();
Statement st = Server.conn.createStatement();
ResultSet rs =
st.executeQuery(
"SELECT * FROM user_info where username='******' and password='******'");
if (!rs.next()) { // User does not exist
server.forwardToReceiver(new Packet(0, "Server", username, "Invalid"));
synchronized (server.usernameSocketMapping) {
server.usernameSocketMapping.remove(username);
}
synchronized (server.isAlive) {
server.isAlive.remove(username);
}
return;
} else { // Authentic user
server.forwardToReceiver(new Packet(0, "Server", username, "Authentic"));
}
} catch (SQLException e1) {
e1.printStackTrace();
}
}
// Sh: Signup message
if (packet.getType() == 2) {
try {
String[] message = packet.getMessage().split(":");
String name = message[0];
String password = message[1];
// String sex=message[2];
String username = message[2];
Statement st = Server.conn.createStatement();
ResultSet rs =
st.executeQuery("SELECT * FROM user_info where username='******'");
if (rs.next()) { // Username already present
server.forwardToReceiver(new Packet(2, "Server", username, "Username present"));
synchronized (server.usernameSocketMapping) {
server.usernameSocketMapping.remove(username);
}
synchronized (server.isAlive) {
server.isAlive.remove(username);
}
return;
} else { // Register user
String query =
"INSERT INTO user_info VALUES('"
+ name
+ "','"
+ password
+ "',"
+ "NULL,'"
+ username
+ "')";
System.out.println(query);
st.executeUpdate(query);
server.forwardToReceiver(new Packet(2, "Server", username, "User Registererd"));
}
} catch (SQLException e1) {
e1.printStackTrace();
}
}
System.out.println("State of isAlive map is: " + server.isAlive);
try {
Statement st = Server.conn.createStatement();
ResultSet rs =
st.executeQuery(
"SELECT sender,message,status FROM msg_buffer where receiver='"
+ username
+ "' order by sender,sno");
String sendflag = null;
String sender = null;
while (rs.next()) {
sender = rs.getString("sender");
int status = rs.getInt("status");
String message = rs.getString("message");
System.out.println("sender: " + sender);
System.out.println("receiver: " + username);
System.out.println("message: " + message);
server.forwardToReceiver(new Packet(status, sender, username, message));
System.out.println("Sending " + packet);
if (!sender.equals(sendflag)) {
server.forwardToReceiver(new Packet(6, username, sender, "Message Received"));
sendflag = sender;
}
}
st.executeUpdate("DELETE FROM msg_buffer where receiver='" + username + "'");
} catch (SQLException e1) {
e1.printStackTrace();
}
while (true) {
packet = (Packet) din.readObject();
if (packet.getType() == 3) // is an OK message
{
try {
packet.setSender(username);
System.out.println("Is OK message");
Statement st = Server.conn.createStatement();
ResultSet rs =
st.executeQuery(
"SELECT * FROM user_info where username='******'");
if (rs.next()) {
if (server.addFriend(packet.getSender(), packet.getReceiver(), true) == 1) {
// packet.setMessage("Already in friend list");
server.forwardToReceiver(
new Packet(1, "Server", packet.getSender(), "Already in friend list"));
System.out.println("ALready in list");
} else {
System.out.println("Sending " + packet);
server.forwardToReceiver(
new Packet(1, "Server", packet.getReceiver(), packet.getMessage()));
server.forwardToReceiver(
new Packet(1, "Server", packet.getSender(), packet.getMessage()));
}
} else {
server.forwardToReceiver(
new Packet(1, "Server", packet.getSender(), "User does not exist"));
}
} catch (SQLException e1) {
e1.printStackTrace();
}
} else if ((packet.getType() == 8)) // is a getFriends message
{
packet.setSender(username);
System.out.println("Type 8");
/*
* try { //Thread.sleep(3000); } catch (InterruptedException
* e) { // TODO Auto-generated catch block
* e.printStackTrace(); }
*/
String FriendsMessage = getFriendsMessage(packet);
server.forwardToReceiver(
new Packet(8, "Server", packet.getSender(), "Friends|" + FriendsMessage));
} else if (packet.getType() == 16) // Random conversation.
{
packet.setSender(username);
String receiver = server.getRandomPerson(packet.getSender());
if (!receiver.equals("No One Online")) {
server.forwardToReceiver(
new Packet(1, "Server", packet.getSender(), receiver + "| will talk to you now."));
server.forwardToReceiver(
new Packet(1, "Server", receiver, packet.getSender() + "| will talk to you now."));
} else {
System.out.println("No one online");
server.forwardToReceiver(new Packet(16, "Server", packet.getSender(), "No One Online"));
server.forwardToReceiver(new Packet(1, "Server", packet.getSender(), "No One Online"));
}
} else if (packet.getType() == 13) { // Webcam of live is started
synchronized (server.webcamAliveMapping) {
server.webcamAliveMapping.put(packet.getSender(), packet.getMessage());
}
System.out.println("State of webcamAliveMapping is: " + server.webcamAliveMapping);
} else if (packet.getType() == 14) { // Webcam of client is
// closed
if (server.webcamAliveMapping.containsKey(packet.getSender())) {
synchronized (server.webcamAliveMapping) {
server.webcamAliveMapping.remove(packet.getSender());
}
}
} else if (packet.getType() == 15) { // Client requested for
// another client's webcam
if (server.webcamAliveMapping.containsKey(
packet.getReceiver())) { // User Webcam is available
server.forwardToReceiver(
new Packet(
15,
"Server",
packet.getSender(),
server.webcamAliveMapping.get(packet.getReceiver())));
} else { // User Webcam not available
server.forwardToReceiver(
new Packet(15, "Server", packet.getSender(), "Webcam Not Found"));
server.forwardToReceiver(
new Packet(
1,
"Server",
packet.getSender(),
"Webcam for " + packet.getReceiver() + " is not available"));
}
} else if (packet.getType() == 17) {
ArrayList<String> friends = new ArrayList<String>();
friends = server.getfriendlist(packet.getSender());
if (friends.isEmpty()) {
server.forwardToReceiver(
new Packet(1, "Server", packet.getSender(), "Your friendlist is empty."));
} else {
for (int i = 0; i < friends.size(); i++) {
server.forwardToReceiver(
new Packet(1, packet.getSender(), friends.get(i), packet.getMessage()));
}
}
} else {
packet.setSender(username);
System.out.println("Sending " + packet);
server.forwardToReceiver(packet);
}
}
} catch (EOFException ie) {
} catch (IOException ie) {
ie.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
try {
din.close();
} catch (IOException e) {
e.printStackTrace();
}
synchronized (server.isAlive) {
server.isAlive.remove(username);
}
synchronized (server.usernameSocketMapping) {
server.usernameSocketMapping.remove(username);
}
System.out.println("State of isAlive map is: " + server.isAlive);
server.removeConnection(socket);
}
}
