Network API

NiLSPACE · 02-14-2015, 02:07 AM

I was playing with the network API, but I can't find a way to close a TCPLink's connection.

xoft · 02-14-2015, 02:21 AM

Yes, I forgot about that. Will fix tonight on train back to prague.

NiLSPACE · 02-14-2015, 02:29 AM

Thanks in advance Smile

xoft · 02-14-2015, 08:23 AM

Close() is implemented; Shutdown() is somewhat problematic - LibEvent keeps the data in a buffer, so when you shut down a socket, you lose whatever LibEvent hasn't sent yet. I'm trying to find a solution to this, because it affects all connections a lot.

NiLSPACE · (This post was last modified: 02-15-2015, 12:33 AM by NiLSPACE.)

I really like the network API Smile

I now have a small webserver where you can use <?lua LuaCode ?> to add code. It even detects if it's a POST or GET request in the code ;D

I even found a use for Lua Coroutines ;D

NiLSPACE · (This post was last modified: 02-15-2015, 06:52 AM by NiLSPACE.)

Made a simple login/logout page:

<?lua
Client, Link = ...
 
 
local Message = ""
 
-- User send a post, so he probably wants to login or logout
if (Client.RequestMethod == "POST") then
    if (Client.POST['logout'] ~= nil) then
        -- The user wants to log out
        Client.SESSION['loggedin'] = false;
        Message = "You logged out"
    elseif (Client.POST['login'] ~= nil) then
        -- The user tries to log in.
        local UserName = Client.POST['username']
        local Password = Client.POST['password']
         
        if (UserName == "admin" and Password == "admin") then
            -- password and username is correct
            Client.SESSION['loggedin'] = true
            Message = "You logged in"
        else
            -- Wrong username or password
            Message = "You used the wrong username or password"
        end
    end
end
 
 
local IsLoggedIn = Client.SESSION['loggedin'];
local Form = [[
<input type="text" name="username" placeholder="username"><br>
<input type="password" name="password" placeholder="password"><br>
<input type="submit" name="login" value="login" >]]
 
if (IsLoggedIn) then
    Form = '<input type="submit" name="logout" value="logout">'
end
 
?>
<!DOCTYPE html>
<html>
<head>
</head>
 
<body>
    <?lua
do -- Do - end isn't needed, but it makes it easier to notice where small bits of lua code are.
    Link:Send(Message) 
end
    ?>
    <form method="POST">
<?lua
do -- Do - end isn't needed, but it makes it easier to notice where small bits of lua code are.
    Link:Send(Form)
end
?>
    </form>
</body
</html>

NiLSPACE · (This post was last modified: 02-15-2015, 11:43 PM by NiLSPACE.)

Is it possible that the cTCPLink:Close function closes the connection before some data that was send is received? I now have to use

cRoot:Get():GetDefaultWorld():QueueTask(
    function()
        a_TCPLink:Close()
    end
)

Because otherwise the browser won't receive anything.

Oh I see in the APIDesc file that I have to use cTCPLink:Shutdown because cTCPLink:Close could do exacly what I just mentioned Wink

xoft · 02-15-2015, 11:54 PM

Exactly

xoft · 02-16-2015, 12:12 AM

I'm thinking about UDP support. Since UDP doesn't have the concept of a persistent connection, I think the only interface needed would be an "Endpoint", which can be attached to a port number and either receive or send UDP datagrams.

The interface:
- cNetwork:CreateUDPEndpoint(Port, UDPCallbacks) -> cUDPEndpoint object

cUDPEndpoint methods:
- IsOpen()
- GetPort()
- Send(Data, Host, Port) - sends a datagram with the specified data payload to the specified host/port
- EnableBroadcasts() - enables the endpoint to send broadcasts (using special host/port combinations)
- Close()

UDPCallbacks:
- OnError(ErrorCode, ErrorMsg)
- OnReceivedData(Data, Host, Port) - A datagram with the specified Data payload has been received from the specified host/port

jan64 · 02-16-2015, 01:45 AM

Sounds good.