/// <summary>
/// Starts the server on specified URL and checks whether error is thrown when another server is already hosted on same URL.
/// </summary>
/// <remarks>
/// Implemented by the use of SignalR framework.
/// Form more information check SignalR documentation.</remarks>
public void StartServer(FormLogin formLogin)
{
try
{
SignalR = WebApp.Start(ServerURI);
}
catch (TargetInvocationException)
{
formLogin.labelStatusText.Invoke(new MethodInvoker(delegate { formLogin.labelStatusText.Text = "Server failed to start.\nA server is already running on " + ServerURI; }));
return;
}
formLogin.StartGameWindowServer(this); //Starts the game window for administrator.
}
/// <summary>
/// Registers new player by creating new account in dataBase which stores his credentials.
/// </summary>
/// <param name="userName">Name of the player who wants to create new account.</param>
/// <param name="password">Password which is used to sign into account.</param>
/// <param name="formLogin">Form used to display information whether registration was successfull.</param>
/// <remarks>
/// Returns true if client account with given user name has been created.
/// False if client account has not been created because username is already taken.
/// </remarks>
/// <returns>
/// True if client account with given user name has been created.
/// False if client account has not been created because username is already taken.
/// </returns>
public bool RegisterNewPlayer(string userName, string password, FormLogin formLogin)
{
using (var dataBase = new DataClassesBettingParlorDataContext())
{
if (!formLogin.CheckIfTextBoxesAreEmpty())
{
Player player = dataBase.Players.SingleOrDefault(p => p.UserName == userName);
if (player == null)
{
Player newPlayer = new Player()
{
UserName = userName,
Password = password,
CurrentAccountBalance = 0,
UserTypeID = 1
};
dataBase.Players.InsertOnSubmit(newPlayer);
dataBase.SubmitChanges();
result = FormLogin.Result.RegistrationSuccessful;
formLogin.ShowResult(result);
return(true);
}
else
{
result = FormLogin.Result.RegistrationFailed;
formLogin.ShowResult(result);
return(false);
}
}
else
{
return(false);
}
}
}
/// <summary>
/// This method is the base for client-server connection.
/// Includes the connection process and all methods wich are run on specific response from server.
/// Every time server sends any kind of information to client this function is responisble for receiving it and handling it properly.
/// Contains all client methods which can be exectuded on the server asynchronously.
/// </summary>
/// <exception cref="HttpRequestException">Thrown when connection can't be established.</exception>
/// <param name="formLogin">UI is passed to display status of the connection properly.</param>
public async void ConnectToServer(FormLogin formLogin)
{
bool successfulConnection = true; //parameter user to define whether connection to server was successfull or not.
//Quering user data to pass it to server
var queryStringData = new Dictionary <string, string>
{
{ "username", userName }
};
Connection = new HubConnection(ServerURI, queryStringData);
HubProxy = Connection.CreateHubProxy("ClientServerConnectionsHub"); //create proxy which is used for receving responses from server.
//Receive information from server that user tries to sign in on different forms without logging out or the race is currently on.
HubProxy.On <bool>("StopConnection", (raceIsOn) =>
{
successfulConnection = false;
if (raceIsOn)
{
formLogin.Invoke((Action)(() =>
MessageBox.Show("Race is currently on. Please wait till the race ends and try to sign in again.", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning)));
}
else
{
formLogin.Invoke((Action)(() =>
MessageBox.Show("You are already signed in on another form. Please close all open forms and reconnect to the server.", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning)));
}
formLogin.labelStatusText.Invoke(new MethodInvoker(delegate { formLogin.labelStatusText.Text = "Log in failed due to error."; }));
Disconnect();
});
//Receive notification whether the race started or not to handle buttons properly.
HubProxy.On <string>("HandleControlsOnTheForm", (notification) =>
{
FormClient.Invoke((Action)(() =>
{
if (notification == "race begins")
{
FormClient.EnableControlsOnRaceStart();
}
else if (notification == "disable handicap")
{
FormClient.DisableHandicapPanel();
}
else
{
return;
}
}));
});
//Receive dog number which won the game to show the winner and prepare the GUI for next race.
HubProxy.On <int>("ManageControlsAfterRaceHasFinished", (dogWinner) =>
FormClient.Invoke((Action)(() =>
FormClient.HandleControlsAfterRaceHasFinished(dogWinner))
));
//Get response from server whether bet operation was successful or not and show aprioprate messagebox.
HubProxy.On <bool, bool>("PlaceBetResult", (result, isStandardBet) =>
FormClient.Invoke((Action)(() =>
{
Task.Run(() => FormClient.ShowResultBet(result)); //run this method async to prevent block of the main UI thread.
if (result) //check if user was able to place bet (had enough cash in his object on server)
{
if (isStandardBet) //check if this response is about standard bet.
{
FormClient.DisableSignOutOptionAfterPlacingStandardBet(); //only one standard bet is allowed.
}
else
{
FormClient.DisableHandicapPanel(); //only one handicap is allowed.
}
}
})));
//Get current account balance of player and update his label on the form.
HubProxy.On <decimal>("UpdateSaldoLabel", (saldo) =>
FormClient.Invoke((Action)(() =>
FormClient.UpdateCurrentAccountBalanceLabel(saldo))
));
//Receive location of each dog on the server form and update them on client form.
HubProxy.On <int, int>("MoveDogs", (dogNumber, location) =>
FormClient.Invoke((Action)(() =>
FormClient.MoveDogsOnClientForm(dogNumber, location))
));
//Handle incoming event from server: use Invoke to write to console from SignalR's thread
//Adds message of specific player to all connected clients chats.
HubProxy.On <string, string>("AddMessage", (name, message) =>
FormClient.Invoke((Action)(() =>
FormClient.GetRichTextBoxConsole.AppendText(String.Format("{0}: {1}" + Environment.NewLine, name, message))
))
);
//Updates dataGriedView on client form to display new bets.
HubProxy.On("UpdateBetTable", () =>
FormClient.Invoke((Action)(() =>
FormClient.UpdateDataGriedView())
));
try
{
await Connection.Start();
}
catch (HttpRequestException)
{
formLogin.labelStatusText.Text = "Unable to connect to server: Game server is not responding.";
return;
}
if (successfulConnection) //prevents opening client form when client wasn't able to establish connection.
{
formLogin.StartGameWindowClient(this); //This function is placed here because it MUST trigger after the try-catch formula is passed.
}
}