Re: [Chicken-users] repl with scgi?

[jbarciela jbarciela]

On 6/28/06, Thomas Chust <address@hidden> wrote:
> On Wed, 28 Jun 2006, felix winkelmann wrote:
>
> > On 6/28/06, jbarciela jbarciela <address@hidden> wrote:
> >
> >> [...] I used scgi-example.scm as a starting point and just called
> >> scgi:add-resource with my own functions. My question is: is there a way
> >> to have a REPL in such an environment and modify the web app
> >> incrementally without restarting the scheme process? (given the fact
> >> that (scgi-server #t) doesn't return)
> >
> > What I usually do, is start the server in a separate thread. I don't
> > know how scgi is implemented, but it works fine (well, most of
> > the time) with the chicken web-server. [...]
>
> Hello,
>
> as I wrote the code, I know how it is implemented and I can tell you that
> Felix's suggestion should work unless you fiddle around manually with the
> contents of the scgi:resources parameter :-)
>
> Just do something like
>
>      (require-extension (srfi 18) scgi)
>
>      (define scgi-server-thread
>        (make-thread
>          (lambda ()
>            (scgi-server #t))
>          'scgi-server))
>
>      (thread-start! scgi-server-thread)
>
> in csi and continue to use the prompt normally.
>
> I remember faintly, though, that under some operating systems the standard
> input port in csi is blocking, causing background threads to run only
> while csi is not waiting for input, which kind of defeats the whole point
> of this exercise... If you experience such problems, you may want to give
> the nbstdin egg a try.
>
> cu,
> Thomas

Thanks Thomas and Felix,

For some reason I was assuming scgi needed to run the show and start a
REPL somehow and not the other way around. I guess that's because I
haven't studied what scgi (the protocol, not the egg) is supposed to
do.

I found this description: http://python.ca/nas/scgi/protocol.txt, but
it only address the data format, it doesn't talk about what services
(if any) scgi provides. I have seen articles
(http://www.mems-exchange.org/software/scgi/;
http://www.zedshaw.com/projects/scgi_rails/)  talking about clusters,
starting new processes/threads, etc; are those things specified in
scgi itself or you have to do them by hand if you need them?

Do you guys know of a better (more complete) description of scgi that
I can read?

Anyway, I tried making the thread myself, but make-thread is unbound.
I noticed that srfi-18 is not an egg, and it doesn't show up if I
enter ",r" in csi. Does that means that I have to compile my own
chicken?

Jaime