[SR-Users] Unquoted values from #!defenv
Daniel-Constantin Mierla
miconda at gmail.com
Tue Dec 7 09:21:33 CET 2021
The current behaviour targets the use of existing values from the
environment variables. If you need other kind of features, you can
propose pull requests. Or you can eventually have a start script that
sets defines with -A cli parameter based on env variables.
Cheers,
Daniel
On 06.12.21 21:56, Ben Kaufman wrote:
>
> Thank you :)
>
>
>
> A follow up question would be on the usability of the #!defenv (and
> probably #!defenvs) usability with #!ifdef. In the scenario below, if
> the environmental variable WITH_DEBUGGER is not defined, then Kamailio
> will fail to start, thus the #!ifdef is somewhat limited. It makes
> sense for scenarios where someone might toggle the setting editing the
> config file, but it would be very convenient to toggle the
> environmental variable instead, particularly in containerized
> environments. Any thoughts on how best to control this?
>
>
>
> #!defenv WITH_DEBUGGER
>
>
>
> #!ifdef WITH_DEBUGGER
>
> loadmodule "debugger"
>
> . . .
>
> #!endif
>
>
>
>
>
>
>
>
>
> *Ben Kaufman*
>
>
>
>
> *From:* Daniel-Constantin Mierla <miconda at gmail.com>
> *Sent:* Monday, December 6, 2021 3:55 AM
> *To:* Kamailio (SER) - Users Mailing List
> <sr-users at lists.kamailio.org>; Ben Kaufman <bkaufman at nexvortex.com>
> *Subject:* Re: [SR-Users] Unquoted values from #!defenv
>
>
>
> Hello,
>
> #!substdef does not set the value inside quoted string, it replaces
> inside a string value, so it does not put quotes around replacement
> part. So it does it it is written in the docs. There is #!substdefs
> witch can create a define with quoted value.
>
> Note that defines are standalone-token replacement, you can define an
> ID to a number, to a keyword (e.g., src_ip), to a quoted string or
> even a multi-line script snippet, like:
>
> #!define IDLOOP $var(i) = 0; \
> while($var(i)<5) { \
> xlog("++++ $var(i)\n"); \
> $var(i) = $var(i) + 1; \
> }
>
> See the core cookbook for more details.
>
> Anyhow, as using env variable values as quoted string is useful and
> setting them with quotes might look odd, I added #!defenvs:
>
> * https://www.kamailio.org/wiki/cookbooks/devel/core#defenvs
> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.kamailio.org%2Fwiki%2Fcookbooks%2Fdevel%2Fcore%23defenvs&data=04%7C01%7Cbkaufman%40nexvortex.com%7C6028b5b0b93344af8d0308d9b89e8a04%7Cafc1818e7b6848568913201b9396c4fc%7C1%7C0%7C637743813349298668%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=Q2j9FAXfUTB2uNwKhu5OeEmQanN7xmMGDYb9JBJw6JY%3D&reserved=0>
>
> Cheers,
> Daniel
>
> On 30.11.21 22:40, Ben Kaufman wrote:
>
> Hello all,
>
>
>
> Looking for some clarification regarding quoting and !#defenv . I
> understand that the example below fails because the environmental
> variable HOME is not quoted, thus when used in the xlog() call it
> fails. How is it possible to evaluate and/or use the value of the
> environmental variable if defined as a preprocessor variable?
> Looking at the documentation the reason for this directive is “It
> is a simplified alternative of
> using *#!substdef* with *$env(NAME)* in the replacement part.” But
> #!substdef would allow setting the value inside of a quoted
> string, so does it really meet that requirement?
>
>
>
> I’m aware that I could use $env(HOME) rather than a preprocessor
> directive of HOME. I’m just trying to understand the usage of the
> #!defenv feature.
>
>
>
>
>
> #!KAMAILIO
>
> ## Tested in 5.5.2
>
> loadmodule "xlog"
>
> loadmodule "pv"
>
> loadmodule "evrexec"
>
>
>
> modparam("evrexec", "exec", "name=evrexec:timer;wait=1000;workers=1;")
>
>
>
> #!defenv HOME
>
>
>
> request_route{
>
> forward();
>
> }
>
>
>
> event_route[evrexec:timer] {
>
> xlog("L_N", "HOME: " + HOME + "\n");
>
> }
>
>
>
>
>
> *Ben Kaufman*
>
>
>
>
>
>
>
>
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> --
> Daniel-Constantin Mierla -- www.asipto.com <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.asipto.com%2F&data=04%7C01%7Cbkaufman%40nexvortex.com%7C6028b5b0b93344af8d0308d9b89e8a04%7Cafc1818e7b6848568913201b9396c4fc%7C1%7C0%7C637743813349298668%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=TSsHgbu0R21zntLh04F9ygSsdMhf2IFMu0gsQH0QdLE%3D&reserved=0>
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--
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
Kamailio Advanced Training - Online
Feb 21-24, 2022 (America Timezone)
* https://www.asipto.com/sw/kamailio-advanced-training-online/
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