protected virtual Response callChecked_ListRoomMembers(string[] commandSplit)
{
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 2, 2, ref errMessage))
{
return(new Response(false, errMessage));
}
string roomName = commandSplit[1];
// get the member list from the upper layer
IEnumerable <string> memberList;
Response res = handle_ListRoomMembers(roomName, out memberList);
// check result
if (!res.Success)
{
return(res);
}
// pack the member list into the response
string membersString = String.Join(":", memberList);
return(new Response(true, membersString));
}
public bool Send_ListRooms(out Response response, out IEnumerable <string> roomList)
{
roomList = null;
// send the command string
string commandString = "list_rooms";
bool stillConnected = m_serverSerializer.Serialize(commandString);
if (!stillConnected)
{
response = null;
return(false); // connection was closed
}
// the server response will contain the room list in the message string
stillConnected = readAck(out response);
if (!stillConnected)
{
return(false); // connection was closed
}
// If server acked successful, parse the message. (Actually, this operation is always successful, but it's good to check in case that ever changes.)
if (response.Success)
{
roomList = CpParseUtilities.SplitMessage(response.Message, m_stringDelimiter);
}
return(true); // connection still active
}
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));
}
public bool Send_ListRoomMembers(string roomName, out Response response, out IEnumerable <string> roomMembers)
{
roomMembers = null;
// send the command string
string commandString = String.Format("list_room_members:{0}", roomName);
bool stillConnected = m_serverSerializer.Serialize(commandString);
if (!stillConnected)
{
response = null;
return(false); // connection was closed
}
// the server response will contain the room member list in the message string
stillConnected = readAck(out response);
if (!stillConnected)
{
return(false); // connection was closed
}
// If server acked successful, parse the message.
if (response.Success)
{
roomMembers = CpParseUtilities.SplitMessage(response.Message, m_stringDelimiter);
}
return(true); // connection still active
}
public static Response ParseAck(string message, char delimiter)
{
Response response = new Response(false, "");
// split and remove whitespace
string[] responseSplit = CpParseUtilities.SplitMessage(message, delimiter, 2);
if (responseSplit.Length > 1)
{
response.Message = responseSplit[1];
}
else
{
response.Message = "";
}
if (responseSplit[0].ToLower() == "ack")
{
response.Success = true;
}
else if (responseSplit[0].ToLower() == "nack")
{
if (String.IsNullOrWhiteSpace(response.Message))
{
response.Message = "Server sent no explanation.";
}
}
else
{
response.Message = String.Format("Server sent unexpected response '{0}'.", message);
}
return(response);
}
protected override async Task ftClientServiceLoopAsync(SslEgg egg)
{
FtClient client = new FtClient(egg.SslStream);
// shortcut lambda
Func <Response, Task <bool> > lSendResponseAsync = async(response) =>
{
return(await CpServersideBase.SendResponseAsync(client.SerializerAsync, response.Success, response.Message));
};
// the command string read from client
var tup = await client.DeserializerAsync.DeserializeAsync("");
bool stillConnected = tup.Item1;
string commandString = tup.Item2;
if (!stillConnected)
{
goto exit;
}
// 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 "file_up":
{
Tuple <bool, Response> res = await callChecked_FileUpAsync(client, commandSplit);
if (res.Item1) // client still connected
{
await lSendResponseAsync(res.Item2);
}
break;
}
case "file_down":
{
Tuple <bool, Response> res = await callChecked_FileDownAsync(client, commandSplit);
if (res.Item1) // client still connected
{
await lSendResponseAsync(res.Item2);
}
break;
}
default:
break;
}
exit:
client.Close();
}
protected virtual Response callChecked_Disconnect(string[] commandSplit, string username)
{
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 1, 1, ref errMessage))
{
return(new Response(false, errMessage));
}
return(handle_Disconnect(username));
}
private void eventChannelReadLoop()
{
while (true)
{
// the command string read from client
string commandString = "";
bool stillConnected = m_serverEventDeserializer.Deserialize(ref commandString);
if (!stillConnected)
{
Logging.DebugWriteLine("Server disconnected.");
goto loop_exit;
}
// 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 "event_disconnect":
{
Response response = receiveEvent_Disconnect_checked(commandSplit);
goto loop_exit;
// [break]
}
case "event_message_room":
{
Response resonse = receiveEvent_MessageRoom_checked(commandSplit);
break;
}
case "event_message_personal":
{
Response response = receiveEvent_MessagePersonal_checked(commandSplit);
break;
}
case "event_room_deleted":
{
Response response = receiveEvent_RoomDeleted_checked(commandSplit);
break;
}
default:
Logging.DebugWriteLine(String.Format("Server sent unknown event. '{0}'.", commandString));
break;
}
}
loop_exit:
m_server.Close();
}
protected virtual Response receiveEvent_Disconnect_checked(string[] commandSplit)
{
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 1, 1, ref errMessage))
{
return(new Response(false, errMessage));
}
return(handle_Disconnect());
}
protected virtual Response callChecked_UnsubscribeRoom(string[] commandSplit, string username)
{
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 2, 2, ref errMessage))
{
return(new Response(false, errMessage));
}
string roomName = commandSplit[1];
return(handle_UnsubscribeRoom(roomName, username));
}
protected virtual async Task <Response> callChecked_DeleteRoom(string[] commandSplit)
{
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 2, 2, ref errMessage))
{
return(new Response(false, errMessage));
}
string roomName = commandSplit[1];
return(await handle_DeleteRoom(roomName));
}
protected virtual Response receiveEvent_RoomDeleted_checked(string[] commandSplit)
{
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 2, 2, ref errMessage))
{
return(new Response(false, errMessage));
}
string roomName = commandSplit[1];
return(handle_RoomDeleted(roomName));
}
protected virtual Response receiveEvent_MessagePersonal_checked(string[] commandSplit)
{
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 3, ref errMessage))
{
return(new Response(false, errMessage));
}
CpParseUtilities.RecombineSplitMessage(ref commandSplit, 2);
string fromUsername = commandSplit[1];
string messageText = commandSplit[2];
return(handle_MessagePersonal(fromUsername, messageText));
}
protected virtual async Task <Response> callChecked_MessagePersonalAsync(string[] commandSplit, string fromUsername)
{
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 3, ref errMessage))
{
return(new Response(false, errMessage));
}
CpParseUtilities.RecombineSplitMessage(ref commandSplit, 2);
string toUsername = commandSplit[1];
string messageText = commandSplit[2];
return(await handle_MessagePersonalAsync(toUsername, fromUsername, messageText));
}
protected virtual Response callChecked_CreateRoom(string[] commandSplit)
{
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 2, 2, ref errMessage))
{
return(new Response(false, errMessage));
}
string roomName = commandSplit[1];
Debug.Assert(m_stringDelimiter == ':');
if (roomName.Contains(m_stringDelimiter))
{
return(new Response(false, "Room name shall not contain a colon."));
}
return(handle_CreateRoom(roomName));
}
protected override async Task <Tuple <bool, Response> > callChecked_FileUpAsync(FtClient ftClient, string[] commandSplit)
{
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 2, 2, ref errMessage))
{
return(new Tuple <bool, Response>(true, new Response(false, errMessage)));
}
// get filename
string filename = commandSplit[1];
// create a file
using (Stream fileOut = FtFileManager.OpenForWrite(filename, out errMessage))
{
if (fileOut == null)
{
return(new Tuple <bool, Response>(true, new Response(false, errMessage)));
}
// send ok (ready to receive file)
bool stillConnected = await SendResponseAsync(ftClient.SerializerAsync, true, "");
if (!stillConnected)
{
return(new Tuple <bool, Response>(false, null));
}
// receive file
var fileReceiveResult = await FtFileManager.FileReceiveAsync(ftClient.Client, fileOut);
if (!fileReceiveResult.Item1)
{
return(new Tuple <bool, Response>(fileReceiveResult.Item1, null));
}
// send ok (file was received ok)
return(new Tuple <bool, Response>(true, fileReceiveResult.Item2));
}
}
protected override async Task <Tuple <bool, Response> > callChecked_FileDownAsync(FtClient ftClient, string[] commandSplit)
{
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 2, 2, ref errMessage))
{
return(new Tuple <bool, Response>(true, new Response(false, errMessage)));
}
// get filename
string filename = commandSplit[1];
// open the file
using (Stream fileIn = FtFileManager.OpenForRead(filename, out errMessage))
{
if (fileIn == null)
{
return(new Tuple <bool, Response>(true, new Response(false, errMessage)));
}
// send ok (ready to send file)
bool stillConnected = await SendResponseAsync(ftClient.SerializerAsync, true, "");
if (!stillConnected)
{
return(new Tuple <bool, Response>(false, null));
}
// send file
stillConnected = await FtFileManager.FileSendAsync(ftClient.Client, fileIn);
if (!stillConnected)
{
return(new Tuple <bool, Response>(false, null));
}
}
return(new Tuple <bool, Response>(true, new Response(true, "")));
}
protected virtual Response callChecked_ListRooms(string[] commandSplit)
{
string errMessage = "";
if (!CpParseUtilities.CheckArgCount(commandSplit, 1, 1, ref errMessage))
{
return(new Response(false, errMessage));
}
// get the room list from upper layer
IEnumerable <string> roomList;
Response res = handle_ListRooms(out roomList);
// the handler actually can't fail, but leave this check in anyway
if (!res.Success)
{
return(res);
}
// pack the room list into the response message
string roomsString = String.Join(":", roomList);
return(new Response(true, roomsString));
}
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();
}
