Remaining number of seconds to midnight

[Zabrane]

Expected Behavior

I'm trying to calculate the remaining number of seconds till midnight and use it in the Cache-Control HTTP header:

sub vcl_backend_response {
set resp.http.X-Seconds-To-Midnight = std.integer(duration=std.time(regsub(now, "^(.+?)\d{2}:\d{2}:\d{2}(.+?)$", "\100:00:00\2")) + 1d - now);
 set beresp.http.Cache-Control = "public, max-age=" + resp.http.X-Seconds-To-Midnight + ", must-revalidate";
}

Current Behavior

An error in the VCL when calling duration.

Possible Solution

No response

Steps to Reproduce (for bugs)

No response

Context

I'm unable to use the function std.integer(duration=...

Varnish Cache version

varnishd (varnish-6.0.13 revision a395739)

Operating system

Debian GNU/Linux 10 (buster)

Source of binary packages used (if any)

No response

[gquintard]

Help us here :-) what's the error?

[Zabrane]

Hi @gquintard

My bad, forgot the error message. Here you are:

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 10 (buster)
Release:	10
Codename:	buster

$ varnishd -V                                                                                                                       
varnishd (varnish-6.0.13 revision a395739fa63cddec305142eabefec0a4fd5339e7)
Copyright (c) 2006 Verdens Gang AS
Copyright (c) 2006-2024 Varnish Software

$ systemctl start varnish
$ journalctl -xu varnish
[...]
-- The job identifier is 4090832.
May 18 16:33:27 XXXX varnishd[29974]: Error:
May 18 16:33:27 XXXX varnishd[29974]: Message from VCC-compiler:
May 18 16:33:27 XXXX varnishd[29974]: Unknown argument 'duration'
May 18 16:33:27 XXXX varnishd[29974]: ('/etc/default.vcl' Line 187 Pos 55)
May 18 16:33:27 XXXX varnishd[29974]:     set resp.http.X-Seconds-To-Midnight = std.integer(duration=std.time(regsub(now, "^(.+?)\d{2}:\d{2}:\d{2}(.+?)$", "\100:00:00\2")) + 1d
May 18 16:33:27 XXXX varnishd[29974]: ------------------------------------------------------########-----------------------------------------------------------------------------
May 18 16:33:27 XXXX varnishd[29974]: While compiling function call:
May 18 16:33:27 XXXX varnishd[29974]: ('/etc/default.vcl' Line 187 Pos 43) -- (Pos 54)
May 18 16:33:27 XXXX varnishd[29974]:     set resp.http.X-Seconds-To-Midnight = std.integer(duration=std.time(regsub(now, "^(.+?)\d{2}:\d{2}:\d{2}(.+?)$", "\100:00:00\2")) + 1d
May 18 16:33:27 XXXX varnishd[29974]: ------------------------------------------############-------------------------------------------------------------------------------------
May 18 16:33:27 XXXX varnishd[29974]: Running VCC-compiler failed, exited with 2
May 18 16:33:27 XXXX varnishd[29974]: VCL compilation failed
May 18 16:33:27 XXXX systemd[1]: varnish.service: Control process exited, code=exited, status=255/EXCEPTION
-- Subject: Unit process exited

Varnish 6.0.13 was installed on a Debian Buster by following these instructions.

Let me know if you need something else or you want me to perform any test.

[gquintard]

Thanks for that. It's just that on 6.0, that option doesn't exist: https://varnish-cache.org/docs/6.0/reference/vmod_generated.html

You will need to either upgrade to something more recent, like 7.5, or use std.time2integer()

[Zabrane]

Thanks @gquintard. I gonna try the std.time2integer().

Any reason why std vmod wasn't backported to 6.x?

We were scared a bit to use 7.5 because of the VSV00014 vulnerability.

[gquintard]

7.5 isn't affected, so that's actually a great reason to use it :-)