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Lua-enet, client keeps giving error no matter what I do
Posted: Mon Oct 05, 2015 1:41 am
by Sharkinmytea
I, I'm trying to make a little server which could receive a packed table as a string, unpack it, calculate stuff on it and return it as a packed table. The problem is that i've used this tutorial
http://leafo.net/lua-enet/#tutorial and tried to adapt it to love with the callbacks.
This is the code i ''made'':
Server:
Code: Select all
require('enet')
message ='Default message!'
local host = enet.host_create("localhost:6789")
function love.update(dt)
local event = host:service(100)
if event then
if event.type == "receive" then
message = "Got message: "..event.data
event.peer:send( "pong" )
elseif event.type == "connect" then
message = " connected." ..event.data
elseif event.type == "disconnect" then
message = " disconnected."
end
event = host:service()
end
end
function love.draw()
love.graphics.setColor(255, 255, 255)
love.graphics.print(message,100,100)
end
Client:
Code: Select all
require('enet')
port = 25565
host = enet.host_create()
server = host:connect("localhost:6789")
function love.update(dt)
local done = false
event = host:service(100)
event.peer:send("hello SERVER") --LINE 12
if event then
if event.type == "connect" then
print("Connected to", event.peer)
event.peer:send("hello SERVE, IM CONNECTED")
elseif event.type == "receive" then
print("Got message from server: ", event.data, event.peer)
done = true
end
end
end
When I try to launch the server, it works properly, it shows this
and when i launch the client it gives this
But the client becomes:
Re: Lua-enet, client keeps giving error no matter what I do
Posted: Mon Oct 05, 2015 1:57 am
by Sharkinmytea
Mmmmmm, quick update, and an important one at that.
It seems the client fails only when i resize or move the server window.
What the hell is this problem and how can i solve it?
Re: Lua-enet, client keeps giving error no matter what I do
Posted: Mon Oct 05, 2015 5:06 am
by Jasoco
Not sure how to solve it, but I can tell you why it might have a problem.
On Windows, when you move or resize the window, Update and Draw do not fire. i.e the run loop pauses. On OS X this happens when you hold the mouse down on one of the traffic light buttons or resize. And on Linux I think it's either the Windows or Mac method. This is an issue with SDL or something that Löve uses and cannot be fixed by the devs. We've had discussion about this "problem" but never in the capacity of network data.
I'm betting that when you pause the execution, one is sending out data that isn't being received on the other end.
To solve, try playing around. Use a console and print some messages to it at different parts in the code. Maybe start by changing it so line 12 (The event.peer:send() line) has an if event then around it or is within that if event line below.
I'm sure someone else can chime in as usual. I haven't had any success with actually getting networking working myself.
Re: Lua-enet, client keeps giving error no matter what I do
Posted: Mon Oct 05, 2015 5:35 am
by Nixola
I think the Linux behaviour depends on the windows manager, I've never had LÖVE lock when moving or resizing using i3wm.
If you need the server to have an actual window, instead of just running in a console, you might want to put the networking code in a thread.
Re: Lua-enet, client keeps giving error no matter what I do
Posted: Mon Oct 05, 2015 6:57 am
by s-ol
Code: Select all
local done = false
event = host:service(100)
event.peer:send("hello SERVER") --LINE 12
if event then
....
should be
Code: Select all
local done = false
event = host:service(100)
if event then
event.peer:send("hello SERVER") --LINE 12
....
event is nil when nothing happened since the last call, and your line 12 assumes that event exists.
Re: Lua-enet, client keeps giving error no matter what I do
Posted: Mon Oct 05, 2015 10:28 pm
by Sharkinmytea
I've played around with my code and I think nixola is correct, Problem ''solved'', i'll have to live with that!
Re: Lua-enet, client keeps giving error no matter what I do
Posted: Mon Oct 05, 2015 10:35 pm
by Nixola
What solllos points out is also true though