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Re: http-request in a controller- is it possible?

From: Nala Ginrut
Subject: Re: http-request in a controller- is it possible?
Date: Sun, 06 Dec 2020 14:12:22 +0800
User-agent: mu4e 1.4.13; emacs 27.1

Hi Jaft!
I would recommend you use http-get from (web client), since it can be
non-blocking and rescheduled by Ragnarok scheduler if it's configured as

The `system' syscall with `curl' can't be controlled by Ragnarok. So
anything could happen.

Best regards.

Jaft writes:

>  Oh, sure; absolutely!
> So say we have
> (get "/other-endpoint" #:mime #t  (lambda (rc)    (:mime rc '(("this is a " . 
> "the other endpoint!")))))
> and we also have (using curl since http-get causes things to freeze, for 
> right now):
> (get "/test-endpoint" #:mime #t  (lambda (rc)    (display "Something here")   
>  (newline)
>     (system "curl";)
>     (:mime rc '(("this is the " . "first endpoint we call")))))
> So, if we don't put (break-task) before the system call, the logs show 
> something like
>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  
> Current                                 Dload  Upload   Total   Spent    Left 
>  Speed  0     0    0     0    0     0      0      0 --:--:--  0:16:33 
> --:--:--     0
> as curl tries to call the local endpoint but, as we know, it'll never load 
> that endpoint until test-endpoint finishes so it just stays at 0% and both 
> endpoint remain frozen, unprogressing.
> If we do put a (break-task) before the system call, the logs will print out 
> "Enter ragnarok scheduler!" when it hits the curl call but then thing pretty 
> much never keep going. The logs pretty much end there, other-endpoint never 
> actually ends up getting called and test-endpoint never finishes running and 
> just hangs forever.
> But, if we do
> (get "/test-endpoint" #:mime #t  (lambda (rc)    (display "Something here")   
>  (newline)
>     (break-task)    (sleep 20)
>     (:mime rc '(("this is the " . "first endpoint we call")))))
> we can call/hit other-endpoint manually as many times as we want in that 20 
> second period and it'll load each time and test-endpoint will, eventually, 
> finish and return back the JSON object.
> Does that make more sense? Not sure if it's feasible but, heh, that's why I'm 
> asking.
> Jonathan    On Saturday, December 5, 2020, 7:19:53 AM CST, Nala Ginrut 
> <> wrote:
> Hi Jaft!
> Jaft writes:
>>  Ah, cool. Easy enough. It it possible to use it where the endpoint calls 
>> another endpoint in the controller? It worked like a charm for (sleep 20) 
>> but the call to the other endpoint, while not being called (and, thus, 
>> hanging), never leaves the scheduler and, in turn, the original endpoint 
>> never finishes loading/processing.
> I'm not sure about your question, could you show an example?
> Best regards.

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