Re: luasocket, howto read/write Non-blocking TPC socket

[Axel Kittenberger <axkibe@...>]

In my humble opinion this example is no longer correct with current luasocket.
In case of timeout it now returns 3 values:
nil, "timeout", partialread

- Axel

On Thu, Dec 2, 2010 at 7:37 PM, Valerio Schiavoni
<valerio.schiavoni@gmail.com> wrote:
> Hello Axel,
> have you seen this example:
> http://www.lua.org/pil/9.4.html ?
>
> On Wed, Dec 1, 2010 at 3:23 PM, Axel Kittenberger <axkibe@gmail.com> wrote:
>>
>> Hello, I didn't stumble on a good example code, so I'm checking that
>> way, as far I understood the luasocket documentation.
>> This code wants to receive whole line and send arbitrary data in
>> nonblocking mode. I just want to ask, since in normal operation
>> this things are harder to test, as the buffers are usually
>> written/read in one sweep.
>>
>> (Suppose socket is opened and set to nonblock via socket:settimeout(0))
>>
>> -- This function is called by select when ready to read.
>> local rBuf = ""
>> local function canRead(socket)
>>    local l, err, rBuf = socket:receive("*l", rBuf)
>>    if not l then
>>        if err ~= "timeout" then
>>            print("connection failed: ", err)
>>            os.exit(-1)
>>        end
>>    else
>>        rBuf = ""
>>    end
>>    print("Received Line:" l)
>> end
>>
>> (Is that a correct way of doing it?)
>> And for writing I came up with this:
>> Function gets also called with no arguments if the buffer is non empty
>> and the socket
>> selected for being writeable.
>>
>> local wBuf = ""
>> function write(...)
>>    wBuf = wBuf..table.concat({...})
>>    local s, err = socket:send(wBuf)
>>    if not s and err~="timeout" then
>>        print("connection failed: ", err)
>>        os.exit(-1)
>>    end
>>    wBuf = wBuf:sub(s + 1, -1)
>> end
>>
>
>