/// <summary>
/// When a client has connected
/// </summary>
/// <param name="ar"></param>
private void ServerAcceptCallback(IAsyncResult ar)
{
/* Procedure =>
* 1- Accept the connection
* 2- Wait for the client to identify itself
* 3- Start receiving data from the terminal
*/
// If the server is stopped while listening for connections, then this will fail
try
{
Socket s = ServerSocket.EndAccept(ar);
byte[] IdentificationBytes = new byte[2];
s.Receive(IdentificationBytes);
if (int.TryParse(Encoding.Default.GetString(IdentificationBytes), out int TerminalID) &&
// ID should never be less then 0
TerminalID >= 0 &&
// ID should exist in the Terminals enum
TerminalID < Enum.GetNames(typeof(Terminals)).Length
)
{
Terminal t = new Terminal((Terminals)TerminalID, s);
s.BeginReceive(ServerBuffer, 0, ServerBuffer.Length, SocketFlags.None, new AsyncCallback(ServerReceiveCallback), s);
ActiveTerminals.Add(t);
Program.PrintMessage(true, $"[{s.RemoteEndPoint.ToString()}]:[{t.TerminalType.ToString()}] -> Connection Established", ConsoleColor.Green);
}
else
{
// Illigal identificationID - Close the socket
s.Close();
}
ServerSocket.BeginAccept(new AsyncCallback(ServerAcceptCallback), null);
}
// Do nothing then
catch { }
}
/// <summary>
/// Stop the server
/// </summary>
public void Shutdown()
{
// Return if socket has not been set
if (ServerSocket == null)
{
return;
}
// Set server state to offline
ServerState = ServerStates.Offline;
// Go through all of the active terminals and disconnect them from the server
foreach (Terminal c in ActiveTerminals)
{
c.Close(); // Closes the connection properly
}
/* Close the ServerSocket and then clear
* the list of active terminals
*/
ServerSocket.Close();
ActiveTerminals.Clear();
}
/// <summary>
/// Begin receiving data from the terminal
/// </summary>
/// <param name="ar"></param>
private void ServerReceiveCallback(IAsyncResult ar)
{
// This can fail if client disconnects
try
{
Socket Client = (Socket)ar.AsyncState;
var _terminal = ActiveTerminals.First(a => a.Connection.Equals(Client));
// Check the lengt of the sent data
int Rec = Client.EndReceive(ar);
// Check if an empty packet was received
if (Rec > 0)
{
// Create new buffer and resize it to the correct size
byte[] ReceivedBytes = ServerBuffer;
Array.Resize(ref ReceivedBytes, Rec);
// Convert the bytes to a string
string Message = Encoding.Default.GetString(ReceivedBytes);
#region Received data
if (Message.Equals("[NEWORDER]"))
{
Program.PrintMessage(true, $"New order from [{Client.RemoteEndPoint}]:[{_terminal.TerminalType}]", ConsoleColor.White);
// Notify terminals
ActiveTerminals.Where(c => c.TerminalType.Equals(Terminals.ChefTerminal) || c.TerminalType.Equals(Terminals.InfoTerminal)).ToList().ForEach(t =>
{
// Try to send notifying message
if (t.SendData("[NEWORDER]"))
{
// Show what terminal was notified
Program.PrintMessage(false, $"Notifying -> [{t.Connection.RemoteEndPoint}]:[{t.TerminalType}]", ConsoleColor.Green);
}
else
{
// The terminal has disconnected so remove it and display message
Program.PrintMessage(false, $"[{t.Connection.RemoteEndPoint}] -> Not active", ConsoleColor.DarkRed);
t.Close();
ActiveTerminals.Remove(t);
}
});
}
if (Message.Equals("[ORDERBAKED]"))
{
Program.PrintMessage(true, $"[{Client.RemoteEndPoint}]:[{_terminal.TerminalType}] marked an order as baked", ConsoleColor.White);
// Notify terminals
ActiveTerminals.Where(c => c.TerminalType.Equals(Terminals.CashierTerminal) || c.TerminalType.Equals(Terminals.InfoTerminal)).ToList().ForEach(t =>
{
// Try to send notifying message
if (t.SendData("[ORDERBAKED]"))
{
// Show what terminal was notified
Program.PrintMessage(false, $"Notifying -> [{t.Connection.RemoteEndPoint}]:[{t.TerminalType}]", ConsoleColor.Green);
}
else
{
// The terminal has disconnected so remove it and display message
Program.PrintMessage(false, $"[{t.Connection.RemoteEndPoint}] -> Not active", ConsoleColor.DarkRed);
t.Close();
ActiveTerminals.Remove(t);
}
});
}
if (Message.Equals("[ORDERDONE]"))
{
Program.PrintMessage(true, $"An order was served from [{Client.RemoteEndPoint}]:[{_terminal.TerminalType}]", ConsoleColor.White);
// Notify terminals
ActiveTerminals.Where(c => c.TerminalType.Equals(Terminals.InfoTerminal)).ToList().ForEach(t =>
{
// Try to send notifying message
if (t.SendData("[ORDERDONE]"))
{
// Show what terminal was notified
Program.PrintMessage(false, $"Notifying -> [{t.Connection.RemoteEndPoint}]:[{t.TerminalType}]", ConsoleColor.Green);
}
else
{
// The terminal has disconnected so remove it and display message
Program.PrintMessage(false, $"[{t.Connection.RemoteEndPoint}] -> Not active", ConsoleColor.DarkRed);
t.Close();
ActiveTerminals.Remove(t);
}
});
}
#endregion
}
// Begin receiving again
Client.BeginReceive(ServerBuffer, 0, ServerBuffer.Length,
SocketFlags.None,
new AsyncCallback(ServerReceiveCallback),
Client);
}
// Remove the connection
catch { }
}
