protected virtual Response callChecked_Connect(AmTcpClient newConnection, string commandString, out string requestedUsername)
{
requestedUsername = "";
// This function is special and has to do the extra work of splitting and checking the commandstring.
string[] commandSplit = CpParseUtilities.SplitMessage(commandString, m_stringDelimiter, 2);
// check it is a "connect" request
if (commandSplit[0].ToLower() != "connect")
{
return(new Response(false, "Expected connection request."));
}
// check arguments (should be 2)
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 2, 2, ref errMessage))
{
return(new Response(false, errMessage));
}
// check if name has a colon in it (not allowed)
requestedUsername = commandSplit[1];
if (requestedUsername.Contains(m_stringDelimiter))
{
return(new Response(false, String.Format("Name shall not contain the delimiter character '{0}'.", m_stringDelimiter)));
}
// attempt to register the user
return(handle_Connect(requestedUsername, newConnection));
}
private async Task cpClientServiceLoopAsync(SslEgg egg)
{
AmTcpClient client = new AmTcpClient(egg);
// shortcut lambda
Func <Response, Task <bool> > lSendResponseAsync = async(response) =>
{
return(await SendResponseAsync(client.Serializer, response.Success, response.Message));
};
// establish connection / register user
string username;
{
// read from the new client (expecting a "connect" commandstring).
var tup = await client.Deserializer.DeserializeAsync("");
bool stillConnected = tup.Item1;
string commandString = tup.Item2;
if (!stillConnected)
{
Logging.DebugWriteLine("Client connected but disconnected before trying to register.");
client.Close();
return;
}
// parse the command string and register the user
Response res = callChecked_Connect(client, commandString, out username);
await lSendResponseAsync(res); // don't need to check result as a disconnected client will be detected upon first read
if (!res.Success)
{
Logging.DebugWriteLine(String.Format("Unable to register new client '{0}'. {1}", username, res.Message));
client.Close();
return;
}
Logging.DebugWriteLine(String.Format("Client '{0}' connected. {1}", username, client.RemoteEndPoint.ToString()));
}
while (true)
{
// the command string read from client
var tup = await client.Deserializer.DeserializeAsync("");
bool stillConnected = tup.Item1;
string commandString = tup.Item2;
if (!stillConnected)
{
// remove the user from various data structures
Response result = handle_Disconnect(username);
Logging.DebugWriteLine(String.Format("Client {0} disconnected.", username));
if (!result.Success)
{
Logging.DebugWriteLine(result.Message);
}
goto exit_while;
}
// an array of strings parsed from the sent command string by splitting by colon :
// hard-coded max 10 substrings. Change if needed.
string[] commandSplit = CpParseUtilities.SplitMessage(commandString, m_stringDelimiter, 10);
switch (commandSplit[0].ToLower())
{
case "disconnect":
{
Response result = callChecked_Disconnect(commandSplit, username);
await lSendResponseAsync(result);
if (result.Success)
{
Logging.DebugWriteLine(String.Format("Client {0} disconnected gracefully.", username));
goto exit_while;
}
Logging.DebugWriteLine(String.Format("From server: Client {0} requested disconnect but was denied. {1}", username, result.Message));
break;
}
case "create_room":
{
Response result = callChecked_CreateRoom(commandSplit);
await lSendResponseAsync(result);
if (result.Success)
{
Logging.DebugWriteLine(String.Format("Client {0} created room '{1}'.", username, commandSplit[1]));
}
break;
}
case "delete_room":
{
Response result = await callChecked_DeleteRoom(commandSplit);
await lSendResponseAsync(result);
if (result.Success)
{
Logging.DebugWriteLine(String.Format("Client {0} deleted room '{1}'.", username, commandSplit[1]));
}
break;
}
case "list_rooms":
{
Response result = callChecked_ListRooms(commandSplit);
await lSendResponseAsync(result);
break;
}
case "subscribe_room":
{
Response result = callChecked_SubscribeRoom(commandSplit, username);
await lSendResponseAsync(result);
break;
}
case "unsubscribe_room":
{
Response result = callChecked_UnsubscribeRoom(commandSplit, username);
await lSendResponseAsync(result);
break;
}
case "list_room_members":
{
Response result = callChecked_ListRoomMembers(commandSplit);
await lSendResponseAsync(result);
break;
}
case "send_message_room":
{
Response result = await callChecked_MessageRoomAsync(commandSplit, username);
await lSendResponseAsync(result);
break;
}
case "send_message_personal":
{
Response result = await callChecked_MessagePersonalAsync(commandSplit, username);
await lSendResponseAsync(result);
break;
}
default:
await lSendResponseAsync(new Response(false, "Unknown command."));
Logging.DebugWriteLine(String.Format("Client sent unknown command. '{0}'", commandString));
break;
}
}
exit_while:
// cleanup socket resources
client.Close();
}
abstract protected Response handle_Connect(string username, AmTcpClient newConnection);
