/// <summary>
/// Finish establishing a connection to the server, invoke the callback in the preserved state object, and begin receiving data
/// </summary>
public static void Connected_to_Server(IAsyncResult state_in_an_ar_object)
{
// Get the state from the parameter
Preserved_State_Object state = (Preserved_State_Object)state_in_an_ar_object.AsyncState;
try
{
state.socket.EndConnect(state_in_an_ar_object);
// Invoke the callback
state.callback.DynamicInvoke(state);
// Begin receiving data from the server
state.socket.BeginReceive(state.buffer, 0, Preserved_State_Object.BufferSize, 0, new AsyncCallback(ReceiveCallback), state);
}
catch (SocketException)
{
// If there is a problem with the socket, gracefully close it down
if (state.socket.Connected)
{
state.socket.Shutdown(SocketShutdown.Both);
state.socket.Close();
}
// Invoke the callback
state.callback.DynamicInvoke(state);
}
}
/// <summary>
/// Handles reception and storage of data
/// </summary>
public static void ReceiveCallback(IAsyncResult state_in_an_ar_object)
{
// Get the state from the parameter, declare a variable for holding count of received bytes
Preserved_State_Object state = (Preserved_State_Object)state_in_an_ar_object.AsyncState;
try
{
int bytesRead = state.socket.EndReceive(state_in_an_ar_object);
// If bytes were read, save the decoded string and invoke the callback
if (bytesRead > 0)
{
state.data.Append(Encoding.UTF8.GetString(state.buffer, 0, bytesRead));
state.callback.DynamicInvoke(state);
}
// Otherwise we are disconnected - close the socket
else
{
//TODO: do these have to stay commented out for it to work, or does it work now?
//Needs to be tested again.
state.socket.Shutdown(SocketShutdown.Both);
state.socket.Close();
}
}
catch (Exception)
{
// If there is a problem with the socket, gracefully close it down
if (state.socket.Connected)
{
state.socket.Shutdown(SocketShutdown.Both);
state.socket.Close();
}
}
}
/// <summary>
/// Method to send and receive data from client
/// </summary>
private void ManageData(Preserved_State_Object state)
{
// Try to perform the complete move or split actions
string[] actions = Regex.Split(state.data.ToString(), @"\n");
for (int i = 0; i < actions.Length - 1; i++)
{
TryMoveOrSplit(actions[i], state);
}
// Try to perform the last move or split action if it is complete, otherwise append what is there for later
string lastAction = actions.Last();
if (lastAction.Length > 1 && lastAction.Last() == ')')
{
TryMoveOrSplit(lastAction, state);
}
else
{
state.data = new StringBuilder(lastAction);
}
// Call for more client actions
Network.I_Want_More_Data(state);
}
/// <summary>
/// Main callback method for setting up a client.
/// </summary>
private void SetUpClient(Preserved_State_Object state)
{
Console.WriteLine("User " + state.data + " has connected to the server.");
// Generate 2 random starting coords within our world, check if other players are there, then send if player won't get eaten immediately (helper method)
double x, y;
Cube cube;
string worldData;
lock (World)
{
World.FindStartingCoords(out x, out y, false);
cube = new Cube(x, y, World.GetUid(), false, state.data.ToString(), World.PLAYER_START_MASS, World.GetColor(), 0);
World.Cubes[cube.uid] = cube;
worldData = World.SerializeAllCubes();
World.DatabaseStats.Add(cube.uid, new World.StatTracker(state.data.ToString()));
}
state.CubeID = cube.uid;
state.data.Clear();
state.callback = new Network.Callback(ManageData);
// Send the client's cube and then all of the world data
Network.Send(state.socket, JsonConvert.SerializeObject(cube) + "\n");
Network.Send(state.socket, worldData);
lock (Sockets)
{
Sockets.Add(state.socket, new ScoreInformation(cube.uid));
}
// Ask for more data from client
Network.I_Want_More_Data(state);
}
/// <summary>
/// Callback method - gets the player cube from the server
/// </summary>
private void GetPlayerCube(Preserved_State_Object state)
{
// Get the player cube (and add its uid to the set of split player cubes)
Cube c = JsonConvert.DeserializeObject <Cube>(state.data.ToString());
PlayerSplitID.Add(PlayerID = c.uid);
// Set the max mass to the initial player mass
MaxMass = c.Mass;
// Add the player cube to the world
lock (World)
{
World.Cubes.Add(c.uid, c);
}
// Begin painting the world
this.Paint += new System.Windows.Forms.PaintEventHandler(this.Display_Paint);
this.Invalidate();
// Set the default move coordinates to the player block's starting location
PrevMouseLoc_x = (int)c.loc_x;
PrevMouseLoc_y = (int)c.loc_y;
// Provide the next callback and start getting game data from the server
state.callback = new Network.Callback(SendReceiveData);
Network.I_Want_More_Data(state);
}
/// <summary>
/// Accepts a new client and begins data transferring
/// </summary>
public static void Accept_a_New_Client(IAsyncResult ar)
{
Preserved_State_Object state = (Preserved_State_Object)ar.AsyncState;
state.socket = state.server.EndAcceptSocket(ar);
state.socket.BeginReceive(state.buffer, 0, Preserved_State_Object.BufferSize, 0, new AsyncCallback(ReceiveCallback), state); //Get the name, then give them their cube.
state.server.BeginAcceptSocket(new AsyncCallback(Accept_a_New_Client), new Preserved_State_Object(state.server, state.callback));
}
/// <summary>
/// Heart of the server code. Creates an async loop for accepting new clients.
/// </summary>
public static void Server_Awaiting_Client_Loop(Delegate callback, int port)
{
TcpListener server = TcpListener.Create(port);
server.Start();
Preserved_State_Object state = new Preserved_State_Object(server, callback);
server.BeginAcceptSocket(new AsyncCallback(Accept_a_New_Client), state);
}
/// <summary>
/// Callback for web server - builds webpages based off of queries received from the browser
/// </summary>
private void CreateWebPage(Preserved_State_Object state)
{
string query = Regex.Split(state.data.ToString(), "\r\n")[0];
string score = @"GET /scores";
string games = @"GET /games\?player=";
string eaten = @"GET /eaten\?id=";
string ending = @" HTTP/1.1";
if (Regex.IsMatch(query, score))
{
/* Upon receiving "GET /scores HTTP/1.1" the server will send back an HTML web page containing a table of information reporting all recorded scores.
* This should include, the length of time alive, the maximum mass, the highest rank, and the number of cubes eaten.
* The HTML table should have one row for each player/game in the database and one column for each of the above required pieces of information.
* A superior solution would create links in this table to the information described below (e.g., clicking on a players name would invoke case 2 below).*/
string dbQuery = "Select * from Players";
Network.Send(state.socket, StatsHTML(new MySqlCommand(dbQuery), 1, "AgCubio Stats | High Scores"), true);
}
else if (Regex.IsMatch(query, games))
{
/*Upon receiving "GET /games?player=Joe HTTP/1.1" the server will send back an HTML web page containing a table of information reporting all games by the player "Joe".
* There should be one row for each game played by the player named in the line of text (e.g., "Joe" in the example above) and a column for each piece of information.
* In addition to the above information, the time of death should be shown and the number of players eaten should be shown.
* A superior solution would also have links to the main score table page and to the list of eaten players for a particular game.*/
query = Regex.Replace(query, "(" + games + ")|(" + ending + ")", ""); // Get the player name
string dbQuery = "Select * from Players where name = '" + query + "'";
Network.Send(state.socket, StatsHTML(new MySqlCommand(dbQuery), 2, "AgCubio Stats | Player: " + query), true);
}
else if (Regex.IsMatch(query, eaten))
{
/*Upon receiving "GET /eaten?id=35 HTTP/1.1" the server should send back an HTML page containing information about the specified game session (e.g., 35 in this example).
* The page should contain all information about the players game, but most importantly highlight the names of players who were eaten. A superior solution would turn "eaten player" names into links to their high scores.
* If there the specified game does not exist, treat this as an "anything else" case as discussed below. As always, a superior solution will have links from this page to other related pages.*/
query = Regex.Replace(query, "(" + eaten + ")|(" + ending + ")", ""); // Get the game id
string dbQuery = "Select * from Eaten natural join Players where GameId = " + query;
Network.Send(state.socket, StatsHTML(new MySqlCommand(dbQuery), 3, "AgCubio Stats | Game ID: " + query), true);
}
else
{
// Show an error page if the first line of text the browser sends the server is invalid
Network.Send(state.socket, HTMLGenerator.GenerateError("Invalid web address"), true);
}
}
/// <summary>
/// Tells server we are ready to receive more data
/// </summary>
public static void I_Want_More_Data(Preserved_State_Object state)
{
try
{
state.socket.BeginReceive(state.buffer, 0, Preserved_State_Object.BufferSize, 0, new AsyncCallback(ReceiveCallback), state);
}
catch (Exception)
{
// If there is a problem with the socket, gracefully close it down
if (state.socket.Connected)
{
state.socket.Shutdown(SocketShutdown.Both);
state.socket.Close();
}
}
}
/// <summary>
/// Begins establishing a connection to the server
/// </summary>
public static Socket Connect_to_Server(Callback callback, string hostname)
{
// Store the server IP address and remote endpoint
// MSDN: localhost can be found with the "" string.
IPAddress ipAddress = (hostname.ToUpper() == "LOCALHOST") ? IPAddress.Parse("::1") : IPAddress.Parse(hostname);
IPEndPoint remoteEP = new IPEndPoint(ipAddress, Port);
// Make a new socket and preserved state object and begin connecting
Socket socket = new Socket(ipAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
Preserved_State_Object state = new Preserved_State_Object(socket, callback);
// Begin establishing a connection
socket.BeginConnect(remoteEP, new AsyncCallback(Connected_to_Server), state);
// Return the socket
return(state.socket);
}
/// <summary>
/// Parses client requests into moves or splits
/// </summary>
private void TryMoveOrSplit(String str, Preserved_State_Object state)
{
// Get the coordinates for the move or split
MatchCollection values = Regex.Matches(str, @"-*\d+");
double x = double.Parse(values[0].Value);
double y = double.Parse(values[1].Value);
// Handle moving or splitting
// *NOTE: Cubes are not actually moved here, as that could lead to more or less movement per player in a given amount of time (based on connection speed)
// - instead, movement direction is appended to a stringbuilder and dealt with all at the same time in the server's heartbeat tick
if (str[1] == 'm')
{
lock (DataReceived) { DataReceived[state.CubeID] = new Tuple <double, double>(x, y); }
}
else if (str[1] == 's')
{
lock (World) { World.Split(state.CubeID, x, y); }
}
}
/// <summary>
/// Callback method - sends the player name to the server
/// </summary>
private void SendName(Preserved_State_Object state)
{
// Pop a dialog box if the connection is not established
if (!socket.Connected)
{
this.Invoke(new Action(UnableToConnect));
return;
}
// Save the network thread to a private member in the GUI (for deactivation later)
NetworkThread = Thread.CurrentThread;
// Prevent network from getting upset over empty string names
string name = (textBoxName.Text == "") ? " " : textBoxName.Text;
// Provide the next callback and send the player name to the server
state.callback = new Network.Callback(GetPlayerCube);
Network.Send(state.socket, name);
}
/// <summary>
/// Callback method - sends moves, receives data from the server
/// </summary>
private void SendReceiveData(Preserved_State_Object state)
{
if (socket.Connected)
{
lock (CubeData)
{
// Use the StringBuilder to append the string received from the server
CubeData.Append(state.data);
}
state.data.Clear();
// Send a move request, following the convention: '(move, dest_x, dest_y)\n'
string move = "(move, " + PrevMouseLoc_x + ", " + PrevMouseLoc_y + ")\n";
Network.Send(socket, move);
// Ask for more data
Network.I_Want_More_Data(state);
}
}
