private void WriteExceptionErrorToClient(TcpServerConnection client, Exception ex)
{
string returnMsg = TcpAppCommandStatus.ERR + " " + ex.Message;
TcpAppServerConnection appServerClient = AppClients.FirstOrDefault(x => x.Connection == client);
string clientName = appServerClient == null?client.ClientIPAddress.ToString() : appServerClient.Name;
Debug.WriteLine("AppServer[" + clientName + "]-Error: " + returnMsg);
client.WriteLineToClient(returnMsg);
}
private void WriteResultToClient(TcpAppServerConnection client, TcpAppInputCommand input)
{
string returnMsg = input.Status.ToString() + " ";
if (!string.IsNullOrEmpty(input.OutputMessage))
{
returnMsg += input.OutputMessage;
}
Debug.WriteLine("AppServer[" + client.Name + "]-TX: " + returnMsg);
client.Connection.WriteLineToClient(returnMsg);
}
private TcpAppServerConnection AddClientToAppClientsList(TcpServerConnection client)
{
lock (AppClients)
{
TcpAppServerConnection result = new TcpAppServerConnection()
{
Connection = client, Name = "#" + client.ClientIPAddress.ToString()
};
AppClients.Add(result);
client.ProcessReceivedMessageCallback = Client_ProcessReceivedMessage;
return(result);
}
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="sender"></param>
public TcpAppServerEventArgs(TcpAppServerConnection sender)
{
Client = sender;
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="sender"></param>
public TcpAppServerExEventArgs(TcpAppServerConnection sender) : base(sender)
{
}
private void Client_ProcessReceivedMessage(TcpServerConnection client, string message, byte[] messageBytes)
{
//Parse and Execute Commands
string[] cmdArg = TcpAppCommon.ParseCommand(message.Trim());
try
{
//Register Client Connection
TcpAppServerConnection ptrClient = AppClients.FirstOrDefault(x => x.Connection == client);
if (ptrClient == null)
{
//Reconstruct device which had already signed out
ptrClient = AddClientToAppClientsList(client);
}
Debug.WriteLine("AppServer[" + ptrClient.Name + "]-RX: " + message);
TcpAppInputCommand inputCommand = TcpAppCommon.CreateInputCommand(Commands, cmdArg);
if (inputCommand != null)
{
inputCommand.AppClient = ptrClient;
}
else//Command keyword not exist
{
//Check if command keyword is alias name
ITcpAppServerPlugin plugin = _Plugins.FirstOrDefault(x => string.Compare(x.Alias, cmdArg[0], true) == 0);
if (plugin != null)
{
//Execute plugin command
inputCommand = plugin.GetPluginCommand(cmdArg.Skip(1).ToArray());
inputCommand.AppClient = ptrClient;
BeforeExecutePluginCommand?.Invoke(this, new TcpAppServerExEventArgs(ptrClient)
{
Plugin = plugin
});
}
else
{
//Error - Unrecognized command.
inputCommand = new TcpAppInputCommand()
{
Status = TcpAppCommandStatus.ERR,
OutputMessage = "Invalid Command " + cmdArg[0]
};
WriteResultToClient(ptrClient, inputCommand);
return;
}
}
//Verify Client had signed in.
if (!inputCommand.AppClient.SignedIn && !inputCommand.Command.IsSystemCommand)
{
throw new Exception("Client not signed in! Execute SignIn first.");
}
if (inputCommand.Command.UseMessageQueue && !inputCommand.Command.IsSystemCommand)
{
//Single thread execution, post message to message queue.
lock (CommandQueue)
{
inputCommand.ID = inputCommand.GetHashCode();
if (ptrClient.NextQueuedCommand == null)
{
ptrClient.NextQueuedCommand = inputCommand; //Set pointer to next queued command.
}
//Add Command to Queue
CommandQueue.Add(inputCommand);
CommandQueueWaitSignal?.Set();
inputCommand.OutputMessage = inputCommand.ID.ToString();
inputCommand.Status = TcpAppCommandStatus.QUEUED;
}
}
else if (inputCommand.Command.IsSystemCommand)
{
inputCommand.ExecuteCallback();
}
else
{
//Execute command, wait until return
if (ExecutionTimeout == 0)
{
inputCommand.ExecuteCallback();
}
//Execute command, terminate on timeout
else
{
ptrClient.ExecuteCommandAsync(inputCommand, ExecutionTimeout);
}
}
WriteResultToClient(ptrClient, inputCommand); //Send result back to client.
}
catch (Exception ex)
{
WriteExceptionErrorToClient(client, ex);
}
}