Scratch

DigiTechs wrote:

What method should I use for sending messages to the server? POST or GET? I know GET is to 'GET' somthing, but I don't really know.. And you said the messages are sent in base255? That's not good.. because I don't have a base255 plugin in my Lua installation, only Base64...

You don't use HTTP, you use raw sockets. It's not base255, you use something like string.char() and some bitshifting. The protocol is described here (and there's various example code for other languages like Python that you might find useful, too).

Edit: looks like you need something like: struct.pack('>I4', size)

Last edited by blob8108 (2012-11-25 06:23:41)

Does Scratch use TCP connection or UDP connection? Cause' I can make my client work with a UDP connection but not a TCP connection.

nXIII wrote:

DigiTechs wrote:

What method should I use for sending messages to the server? POST or GET? I know GET is to 'GET' somthing, but I don't really know.. And you said the messages are sent in base255? That's not good.. because I don't have a base255 plugin in my Lua installation, only Base64...

It's base 256, and you can just do it by converting numbers to character codes.

Code:

length = string.char(
    math.floor(n / 0x1000000) % 0x100,
    math.floor(n / 0x10000) % 0x100,
    math.floor(n / 0x100) % 0x100,
    n % 0x100)

EDIT: Removed the bitwise operators.

Ok. I'll use that.

bobbybee wrote:

You don't actually use base255. The easiest way is to do it like this:


0x00 0x00 0x00 length. Length must be one byte, and the 0s are one byte, too!

Ok.

I copied bits from the server code and recoded them in Lua so I could get the messages to send and recieve, but for some reason, I keep getting an error..

error wrote:

lua: echoclnt.lua:15: bad argument #1 to 'len' (string expected, got nil)
stack traceback:
    [C]: in function 'len'
    echoclnt.lua:15: in function 'addlen'
    echoclnt.lua:25: in function 'send_broadcast'
    echoclnt.lua:32: in main chunk
    [C]: ?

Here's the code I'm using:

local socket = require("socket")
host = host or "69.164.139.192"
port = port or 42001
if arg then
    host = arg[1] or host
    port = arg[2] or port
end
function addlen(commd)
    n = string.len(commd)
    length = string.char(
    math.floor(n / 0x1000000) % 0x100,
    math.floor(n / 0x10000) % 0x100,
    math.floor(n / 0x100) % 0x100,
    n % 0x100)
    return ""..tostring(length)..""..cmd..""
end    
function send_broadcast(name)
    msg =  ('broadcast "{0}"'..string.format(name))
    msg = addlen(message)
    assert(udp:send(message))
end
host = socket.dns.toip(host)
udp = assert(socket.udp())
assert(udp:setpeername(host, port))
print("Using remote host '" ..host.. "' and port " .. port .. "...")
send_broadcast("<chat2")
while 1 do
    line = io.read()
    if not line or line == "" then os.exit() end
    send_broadcast(line)
    dgram = assert(udp:receive())
    print(dgram)
end

I think the server is a TCP server, but looking at the code, I can't exactly tell.

DigiTechs wrote:

Does Scratch use TCP connection or UDP connection?

TCP.

blob8108 wrote:

DigiTechs wrote:

Does Scratch use TCP connection or UDP connection?

TCP.

So the server runs in TCP? Meep. Lua doesn't like me when using TCP connections, it only works when using the UDP connection.

OK, I changed the code a little. I found out some things were stupidly typed, so I corrected them. Here's my NEW code:

local socket = require("socket")
host = host or "69.164.139.192"
port = port or 42001
if arg then
    host = arg[1] or host
    port = arg[2] or port
end
function addlen(commd)
    n = string.len(commd)
    length = string.char(
    math.floor(n / 0x1000000) % 0x100,
    math.floor(n / 0x10000) % 0x100,
    math.floor(n / 0x100) % 0x100,
    n % 0x100)
    return ""..tostring(length)..""..commd.."" --EDIT: I realised 'cmd' is an invalid variable, so 'commd'.
end    
function send_broadcast(name)
    msg =  ('broadcast "'..string.format(name)..'"')
    msg = addlen(message)
    assert(tcp:send(msg))
end
tcp = assert(socket.tcp())
assert(tcp:connect(host, port))
print("Using remote host '" ..host.. "' and port " .. port .. "...")
send_broadcast("<chat2")
while 1 do
    line = io.read()
    if not line or line == "" then os.exit() end
    send_broadcast(line)
    dgram = assert(tcp:receive())
    print(dgram)
end

And obviously with more code/less code, there's more errors!

error wrote:

lua: echoclnt.lua:23: timeout
stack traceback:
    [C]: in function 'assert'
    echoclnt.lua:23: in main chunk
    [C]: ?
>Exit code: 1

Lua just likes to time out 
Kinda not fair. Well, I suppose everything's not fair to some extent.

Last edited by DigiTechs (2012-11-26 11:36:55)

DigiTechs wrote:

OK, I changed the code a little. I found out some things were stupidly typed, so I corrected them. Here's my NEW code:

Code:

local socket = require("socket")
host = host or "69.164.139.192"
port = port or 42001
if arg then
    host = arg[1] or host
    port = arg[2] or port
end
function addlen(commd)
    n = string.len(commd)
    length = string.char(
    math.floor(n / 0x1000000) % 0x100,
    math.floor(n / 0x10000) % 0x100,
    math.floor(n / 0x100) % 0x100,
    n % 0x100)
    return ""..tostring(length)..""..commd.."" --EDIT: I realised 'cmd' is an invalid variable, so 'commd'.
end    
function send_broadcast(name)
    msg =  ('broadcast "'..string.byte(name)..'"')
    msg = addlen(message)
    assert(tcp:send(msg))
end
tcp = assert(socket.tcp())
assert(tcp:connect(host, port))
print("Using remote host '" ..host.. "' and port " .. port .. "...")
send_broadcast("<chat2")
while 1 do
    line = io.read()
    if not line or line == "" then os.exit() end
    send_broadcast(line)
    dgram = assert(tcp:receive())
    print(dgram)
end

And obviously with more code/less code, there's more errors!

error wrote:

lua: echoclnt.lua:23: timeout
stack traceback:
    [C]: in function 'assert'
    echoclnt.lua:23: in main chunk
    [C]: ?
>Exit code: 1

Lua just likes to time out 
Kinda not fair. Well, I suppose everything's not fair to some extent.

WAIIT........ I think I might call myself 'braindead' - I just found a MAJOR DERP in my code:

Major Derp wrote:

msg =  ('broadcast "'..string.byte(name)..'"')
    msg = addlen(message)

Do you see what it's doing? It's setting the 'msg' variable to 'broadcast "*valueof(string.byte(name))*"' and THEN to what addlen(message) returns.. *chipmunk voice deeper* Major derpstar!

You want:

function send_broadcast(name)
    msg =  ('broadcast "{0}"'..string.format(name))
    msg = addlen(msg)
    assert(udp:send(msg))
end

Since the length is the length of the entire message that's being sent.

No one's online! D:

DigiTechs wrote:

Hmmmmmmmmmm.. I think I might call this thread 'dead' - No on's replying at all and I seem to be the only one who does. But, I am still working on my Lua bot! I still haven't fixed the timeouts, but I tried it when connecting to a localhost server and it worked fine. I added some commands, too. If anyone sees me messing about with a chatter with ANY DigiBot name, it's probbably mine. But I have a special syntax for my DigiBot bots.

It's in stasis at the moment. 

Hopefully this thread will become much more active once I get LSTC Green out and I release Chat.PY 4.

laser314 wrote:

Is chat.py 3.0 working yet?

I'm going to be dropping 3.0 since it doesn't have the stability that I want. So we (I) am going to move on to Chat.PY 4.0 and LSTC Green (since it should supposedly use less resources).

Magnie wrote:

laser314 wrote:

Is chat.py 3.0 working yet?

I'm going to be dropping 3.0 since it doesn't have the stability that I want. So we (I) am going to move on to Chat.PY 4.0 and LSTC Green (since it should supposedly use less resources).

But chat.py 2.0 doesn't work.