//call event listeners when A new chat request is created
private void safeInvokeNewChatRequest(string senderNickname, string receiverNickname)
{
if (!serverActive)
{
return;
}
if (NewChatRequest == null)
{
return; //No Listeners
}
NewChatRequestEvent listener = null;
Delegate[] dels = NewChatRequest.GetInvocationList();
foreach (Delegate del in dels)
{
try
{
listener = (NewChatRequestEvent)del;
listener.Invoke(senderNickname, receiverNickname);
}
catch (Exception ex)
{
//Could not reach the destination, so remove it
//from the list
NewChatRequest -= listener;
}
}
}
private void Button_Clicked(object sender, EventArgs e)
{
if (usernameEntry.Text.Trim().Length > 0)
{
var usr = usernameEntry.Text.Trim();
Navigation.PopModalAsync(animated: true);
Task.Run(() => {
var req = new NewChatRequest(myUsername, usr.ToUsername(), sessionID);
writer.Write(req);
});
}
}
private void HandleLoggedInRequests()
{
while (loggedIn)
{
req = (Request)br.Read();
if (req.SessionID != sessionID)
{
return;
}
switch (req.Type)
{
case RequestType.NewChat:
NewChatRequest NCReq = (NewChatRequest)req;
(success, info, reason) = server.database.CreateChat(NCReq.participants);
if (success)
{
foreach (Username user in info.participants)
{
if (server.writersPerUsername.TryGetValue(user, out var writer))
{
writer.Write(new ChatCreatedResponse(info, sessionID));
}
}
}
else
{
resp = new FailResponse(reason, sessionID);
}
info = null;
reason = null;
break;
case RequestType.NewMessage:
NewMessageRequest NMReq = (NewMessageRequest)req;
(success, users, msg, reason) = server.database.AddMessage(NMReq.chatType, NMReq.chatID, NMReq.message);
// (future) confirm receiving the message
foreach (Username user in users)
{
server.writersPerUsername.TryGetValue(user, out var writer);
if (writer != null)
{
writer.Write(new AddMessageResponse(NMReq.chatType, NMReq.chatID, msg, sessionID));
}
}
msg = null;
users = null;
reason = null;
break;
case RequestType.DeleteMessage:
DeleteMessageRequest DMReq = (DeleteMessageRequest)req;
(success, users, reason) = server.database.DeleteMessage(DMReq.chatType, DMReq.chatID, DMReq.dateTime);
if (success)
{
foreach (var user in users)
{
if (server.writersPerUsername.TryGetValue(user, out var writer))
{
writer.Write(new DeleteMessageResponse(DMReq.chatType, DMReq.chatID, DMReq.dateTime, sessionID));
}
}
}
break;
case RequestType.GetOnlineContacts:
OnlineContactsRequest OCReq = (OnlineContactsRequest)req;
(success, users, reason) = server.database.GetOnlineContacts(OCReq.username);
if (success)
{
resp = new OnlineContactsResponse(users, sessionID);
}
break;
case RequestType.ChangePassword:
ChangePasswordRequest CPReq = (ChangePasswordRequest)req;
(success, reason) = server.database.ChangePassword(CPReq.username, CPReq.oldPassword, CPReq.newPassword);
if (success)
{
resp = new SuccessResponse(sessionID);
}
else
{
resp = new FailResponse(reason, sessionID);
}
break;
default:
resp = new FailResponse("Unsupported request type detected.", sessionID);
break;
}
req = null;
if (resp != null)
{
bw.Write(resp);
//resp.Send(bw);
resp = null;
if (!loggedIn)
{
return;
}
}
}
}
