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bug#48468: substitute server connection timeout
From: |
Ludovic Courtès |
Subject: |
bug#48468: substitute server connection timeout |
Date: |
Fri, 18 Jun 2021 14:33:21 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) |
Hi,
Mathieu Othacehe <othacehe@gnu.org> skribis:
> Investigating it, I found that the connection is closed and opened
> multiple times in the call-with-cached-connection procedure of the (guix
> script substitute) module.
>
> It looks like its because a 'bad-headers exception is raised when trying
> to parse an eof object:
>
> ;;; (error bad-header (read-header-line #<eof>))
>
>
> I'm not sure where this eof comes from. There is this comment in the
> http-multiple-get procedure in (guix http-client):
>
> ;; Swallow networking errors that could occur due to connection reuse
> ;; and the like; they will be handled down the road when trying to
> ;; read responses.
> (false-if-networking-error
> (begin
> (for-each (cut write-request <> buffer) batch)
> (put-bytevector p (get))
> (force-output p))))
>
> which would suggest that connection reuse could cause networking errors?
Trying to see exactly which bit is at fault here. First,
‘http-multiple-get’ seems to be working as expected when passed a fresh
connection:
--8<---------------cut here---------------start------------->8---
scheme@(guix http-client)> (http-multiple-get (string->uri
"https://ci.guix.gnu.org")
(lambda (request response port
result)
(get-bytevector-n port
(response-content-length response))
(cons #t result))
'()
(make-list
5000
(build-request (build-uri 'https
#:host "ci.guix.gnu.org"
#:path "/d7gpr41qpsifri54vp2lzjs99zkylscq.narinfo"))))
connecting (5000 requests left)...connecting (4400 requests left)...connecting
(3800 requests left)...connecting (3200 requests left)...connecting (2600
requests left)...connecting (2000 requests left)...connecting (1400 requests
left)...connecting (800 requests left)...connecting (200 requests left)...$143
= (#t #t …)
scheme@(guix http-client)> (length $143)
$144 = 5000
--8<---------------cut here---------------end--------------->8---
But maybe I’m not looking at the right thing.
Do you have evidence or a reproducer?
Thanks,
Ludo’.
- bug#48468: substitute server connection timeout,
Ludovic Courtès <=