Hi,
Am 17. August 2022 13:50:46 MESZ schrieb Gentoo Arch <gentooc...@firemail.cc>:
> Hi,
>
> I'd like to ask for your advice.
>
> I'm trying to figure out how Guile webserver works to develop a simple BBS
> and I'm kinda stuck with POST request.
>
> My Guile script generates a form on any path and the form sends to "/post"
> path, where I can easily render content sent by the form.
>
> (define (show-page request body)
> (if (equal? (get-path request) ; get-path is my other function to retrieve
> the path
> '("post"))
> (values '((content-type . (text/plain)))
> body)
> (respond ; literally a respond template from webserver doc
> `((h1 "Oops!")
> (p (@ (id "test")) "The path: " ,(get-path request))
> (form (@ (method "POST") (action "/post"))
> (label (@ (for "test")) "Content: ")
> (input (@ (id "test") (type "text") (name "content")))
> (input (@ (type "submit") (value "Submit"))))))))
>
> But I would like to operate upon the content the form sends like web apps
> usually do: insert it in the database or simply write to file. So my question
> is how I can proceed with something like that:
>
> (define tf (open-file "test-file.txt" "a"))
>
> (define (show-page request body)
> (if (equal? (get-path request)
> '("post"))
> ((values '((content-type . (text/plain)))
> body)
> (display body tf)); I'd like to write/append body to the file, but it
> does nothing
> (respond
> `((h1 "Oops!")
> (p (@ (id "test")) "The path: " ,(get-path request))
> (form (@ (method "POST") (action "/post"))
> (label (@ (for "test")) "Content: ")
> (input (@ (id "test") (type "text") (name "content")))
> (input (@ (type "submit") (value "Submit"))))))))
>
> If I remove (values), it does write to a file (with a complaint in webserver
> output), but I'd also like to add some kind of redirect from "/post" page
> after the script has written stuff to file and I can't use two functions per
> response.
>
> Could you please advise how I can achieve this functionality?
I think you probably want to replace the true-branch of your `if' form with
(begin
(display body tf)
(values '((content-type . (text/plain)) body))
It is important that the handler returns two values, so the `values' form must
come last in the sequence. These two return values make up the response.
Best
Daniel
