/// <summary>
/// Disconnects from the server.
/// This should reset this client to default state.
/// </summary>
public void Disconnect()
{
Debug.WriteLine("disconnecting");
// Sending disconnect message to the server, if state isn't null
if (_socketState != null)
{
AbstractNetworking.Send(_socketState, DISCONNECT);
}
// stopping timers
pingTimer?.Stop();
serverTimer?.Stop();
DisconnectSpreadsheetCallback?.Invoke();
}
/// <summary>
/// Called when data is received on the socket.
/// </summary>
/// <param name="data">The data that was received.</param>
public void DataReceived(string data)
{
var commands = data.Split(Convert.ToChar(END_OF_TEXT));
foreach (var message in commands)
{
if (message.Trim() == "")
{
continue;
}
// Add back EOT after being split.
var eotMessage = message + END_OF_TEXT;
Debug.WriteLine(eotMessage, "data recieved from from server ");
// If a disconnect message is received, Disconnect the client
if (eotMessage.Equals(DISCONNECT))
{
pingTimer.Stop();
serverTimer.Stop();
DisconnectSpreadsheetCallback?.Invoke();
}
// If a ping is received from the Server, send a ping_response back
if (eotMessage.Equals(PING))
{
AbstractNetworking.Send(_socketState, PING_RESPONSE);
}
// If a ping response is received from the Server, the Server ping response timer is reset
if (eotMessage.Equals(PING_RESPONSE))
{
// timer ensuring Server is still up resets, Server has another 60 seconds until
// another ping_response is necessary
serverTimer.Stop(); serverTimer.Start();
}
// We know the first packet has been handled once the world is not null.
if (eotMessage.Equals(FILE_LOAD_ERROR) || eotMessage.StartsWith(CONNECTION_ACCEPTED_PREFIX))
{
ParseFirstPacket(eotMessage);
}
else
{
// full_state is only received upon initial loading of spreadsheet
// and the ping loop begins after the full_state message is received
if (eotMessage.StartsWith(FULL_STATE_PREFIX))
{
FullStateDocumentDocument(eotMessage);
// if serverTimer reaches 60s, disconnect from the Server
serverTimer = new Timer(60000)
{
Enabled = true,
AutoReset = false
};
serverTimer.Elapsed += Disconnect;
// every 10 seconds (10000 milliseconds) another ping is sent to the Server
pingTimer = new Timer(10000)
{
Enabled = true
};
pingTimer.Elapsed += Ping;
// ping loop begins as both timers are started
pingTimer.Start();
serverTimer.Start();
}
else if (eotMessage.StartsWith(CHANGE_PREFIX))
{
ChangeDocument(eotMessage);
}
else if (eotMessage.StartsWith(FOCUS_PREFIX))
{
Focus_Cell(eotMessage, FOCUS_PREFIX);
}
else if (eotMessage.StartsWith(UNFOCUS_PREFIX))
{
Unfocus_Cell(eotMessage, UNFOCUS_PREFIX);
}
}
}
// Get new data.
AbstractNetworking.GetData(_socketState);
}
