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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
non-blocking.
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 http://127.0.0.1:3000/other-endpoint")
> (: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
> <mulei@gnu.org> 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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- http-request in a controller- is it possible?, Mortimer Cladwell, 2020/12/03
- Re: http-request in a controller- is it possible?, Nala Ginrut, 2020/12/03
- Re: http-request in a controller- is it possible?, Nala Ginrut, 2020/12/03
- Re: http-request in a controller- is it possible?, Nala Ginrut, 2020/12/03
- Re: http-request in a controller- is it possible?, Jaft, 2020/12/04
- Re: http-request in a controller- is it possible?, Nala Ginrut, 2020/12/04
- Re: http-request in a controller- is it possible?, Jaft, 2020/12/05
- Re: http-request in a controller- is it possible?, Nala Ginrut, 2020/12/05
- Re: http-request in a controller- is it possible?, Jaft, 2020/12/05
- Re: http-request in a controller- is it possible?,
Nala Ginrut <=
- Re: http-request in a controller- is it possible?, Jaft, 2020/12/06
- Re: http-request in a controller- is it possible?, Nala Ginrut, 2020/12/07
- Re: http-request in a controller- is it possible?, Jaft, 2020/12/07
- Re: http-request in a controller- is it possible?, Nala Ginrut, 2020/12/07
- Re: http-request in a controller- is it possible?, Mortimer Cladwell, 2020/12/09
- Re: http-request in a controller- is it possible?, Nala Ginrut, 2020/12/11
- Re: http-request in a controller- is it possible?, Mortimer Cladwell, 2020/12/12
- Re: http-request in a controller- is it possible?, Nala Ginrut, 2020/12/12