28 Jul
2021
28 Jul
'21
5:47 p.m.
Sorry to bother on this, but is it possible to access Kamailio transformations in KEMI,
and if so, how?
In Kamailio's native scripting language I could do:
$var(pai_user) = $(hdr(P-Asserted-Identity){tobody.user});
In KEMI, I can easily get the full header like this:
KSR.hdr.get("P-Asserted-Identity")
But I don't see how to access the transformations. Am I missing it?
Ben Kaufman
28 Jul
28 Jul
5:51 p.m.
In a fully-fledged general programming runtime, do you need transformations? ;-)
l header like this:
KSR.hdr.get("P-Asserted-Identity")
But I don’t see how to access the transformations. Am I missing it?
In a fully-fledged general programming runtime, do you need transformations? ;-)
https://docs.python.org/3/library/urllib.parse.html
— Alex
--
Alex Balashov | Principal | Evariste Systems LLC
Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
6:04 p.m.
By way of further answer:
Kamailio’s transformations exist in order to provide some semblance of string utility
& parsing functions to a custom, from-ground-up programming language that wouldn’t
otherwise possess them, for lack of a standard library that general-purpose programming
languages have.
It has no built-in string primitives with accessor and mutator functions of various
kinds[1], no String object with manipulation methods, no len(), no split(), etc.
The transformations are Kamailio config script’s effort to provide a subset of this sort
of capability that is most useful for processing SIP messages.
Things like {tobody.user} exist in Kamailio because there’s literally* no other way to do
that.
The whole point of doing Kamailio config scripting through KEMI in a more general language
is to be able to leverage those general language capabilities, along with other libraries
or modules, hot reload, etc.
— Alex
[1] Outside of the blunt instruments of textops* and friends.
--
Alex Balashov | Principal | Evariste Systems LLC
Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
6:36 p.m.
I get that, and in the general scope of things it's hard to argue against leveraging
what should be a more feature rich language. With that said, the desire to leverage
transformations is:
1. To be able to quickly convert existing Kamailio scripts to KEMI. Long term it's
certainly best to evaluate line-by-line what to change, but the more that an existing
config can simply 'drop in' to Kamailio, the easier this move could be
facilitated.
2. Some of this comes to re-inventing the wheel. A cursory look for python modules
doesn't yield any results that I find as lightweight (twisted seems heavy for this
purpose), simple, and battle tested as Kamailio's transformations for this specific
purpose of parsing a tobody/nameaddr SIP header.
-----Original Message-----
From: sr-users <sr-users-bounces(a)lists.kamailio.org> On Behalf Of Alex Balashov
Sent: Wednesday, July 28, 2021 10:05 AM
To: Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org>
Subject: Re: [SR-Users] Accessing Transformations in KEMI
By way of further answer:
Kamailio’s transformations exist in order to provide some semblance of string utility
& parsing functions to a custom, from-ground-up programming language that wouldn’t
otherwise possess them, for lack of a standard library that general-purpose programming
languages have.
It has no built-in string primitives with accessor and mutator functions of various
kinds[1], no String object with manipulation methods, no len(), no split(), etc.
The transformations are Kamailio config script’s effort to provide a subset of this sort
of capability that is most useful for processing SIP messages.
Things like {tobody.user} exist in Kamailio because there’s literally* no other way to do
that.
The whole point of doing Kamailio config scripting through KEMI in a more general language
is to be able to leverage those general language capabilities, along with other libraries
or modules, hot reload, etc.
— Alex
[1] Outside of the blunt instruments of textops* and friends.
--
Alex Balashov | Principal | Evariste Systems LLC
Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
__________________________________________________________
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Important: keep the mailing list in the recipients, do not reply only to the sender!
Edit mailing list options or unsubscribe:
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6:16 p.m.
Hello,
transformations are bound to variables, you have to use
KSR.pv.get("$(hdr(P-Asserted-Identity){tobody.user})") or the other
variants to get the value of variables from KSR.pv group of functions:
*
http://kamailio.org/docs/tutorials/devel/kamailio-kemi-framework/core/#ksrp…
Cheers,
Daniel
On 28.07.21 16:47, Ben Kaufman wrote:
Sorry to bother on this, but is it possible to access Kamailio
transformations in KEMI, and if so, how?
In Kamailio’s native scripting language I could do:
$var(pai_user) = $(hdr(P-Asserted-Identity){tobody.user});
In KEMI, I can easily get the full header like this:
KSR.hdr.get("P-Asserted-Identity")
But I don’t see how to access the transformations. Am I missing it?
*Ben Kaufman*
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions
* sr-users(a)lists.kamailio.org
Important: keep the mailing list in the recipients, do not reply only to the sender!
Edit mailing list options or unsubscribe:
* https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
--
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
6:41 p.m.
Thank you. What's the process for submitting changes to the KEMI documentation
system? If the search box had returned results for "transformation" it would
have been helpful. I think I also saw a small type-o somewhere in their recently.
Ben Kaufman
From: Daniel-Constantin Mierla <miconda(a)gmail.com>
Sent: Wednesday, July 28, 2021 10:16 AM
To: Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org>rg>; Ben Kaufman
<bkaufman(a)nexvortex.com>
Subject: Re: [SR-Users] Accessing Transformations in KEMI
Hello,
transformations are bound to variables, you have to use
KSR.pv.get("$(hdr(P-Asserted-Identity){tobody.user})") or the other variants to
get the value of variables from KSR.pv group of functions:
* http://kamailio.org/docs/tutorials/devel/kamailio-kemi-framework/core/#ksrp…
Cheers,
Daniel
On 28.07.21 16:47, Ben Kaufman wrote:
Sorry to bother on this, but is it possible to access Kamailio transformations in KEMI,
and if so, how?
In Kamailio's native scripting language I could do:
$var(pai_user) = $(hdr(P-Asserted-Identity){tobody.user});
In KEMI, I can easily get the full header like this:
KSR.hdr.get("P-Asserted-Identity")
But I don't see how to access the transformations. Am I missing it?
Ben Kaufman
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions
* sr-users@lists.kamailio.org<mailto:sr-users@lists.kamailio.org>
Important: keep the mailing list in the recipients, do not reply only to the sender!
Edit mailing list options or unsubscribe:
* https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
--
Daniel-Constantin Mierla -- www.asipto.com<http://www.asipto.com>
www.twitter.com/miconda<http://www.twitter.com/miconda> --
www.linkedin.com/in/miconda<http://www.linkedin.com/in/miconda>
9:28 p.m.
The repo for the docs is at:
* https://github.com/kamailio/kamailio-docs
The kemi docs are generated from the folder kamailio-kemi-framework. The
index of exported functions by Kamailio modules is auto-generated. To
add documentation for a specific function, you have to create (or update
if exiting) a dedicated file, like:
*
https://github.com/kamailio/kamailio-docs/blob/master/kamailio-kemi-framewo…
To contribute, just make pull requests.
The mkdocs framework is used for generating the html version.
Cheers,
Daniel
On 28.07.21 17:41, Ben Kaufman wrote:
Thank you. What’s the process for submitting changes to the KEMI
documentation system? If the search box had returned results for
“transformation” it would have been helpful. I think I also saw a
small type-o somewhere in their recently.
*Ben Kaufman*
*From:* Daniel-Constantin Mierla <miconda(a)gmail.com>
*Sent:* Wednesday, July 28, 2021 10:16 AM
*To:* Kamailio (SER) - Users Mailing List
<sr-users(a)lists.kamailio.org>rg>; Ben Kaufman <bkaufman(a)nexvortex.com>
*Subject:* Re: [SR-Users] Accessing Transformations in KEMI
Hello,
transformations are bound to variables, you have to use
KSR.pv.get("$(hdr(P-Asserted-Identity){tobody.user})") or the other
variants to get the value of variables from KSR.pv group of functions:
*
http://kamailio.org/docs/tutorials/devel/kamailio-kemi-framework/core/#ksrp…
<http://kamailio.org/docs/tutorials/devel/kamailio-kemi-framework/core/#ksrpvget>
Cheers,
Daniel
On 28.07.21 16:47, Ben Kaufman wrote:
Sorry to bother on this, but is it possible to access Kamailio
transformations in KEMI, and if so, how?
In Kamailio’s native scripting language I could do:
$var(pai_user) = $(hdr(P-Asserted-Identity){tobody.user});
In KEMI, I can easily get the full header like this:
KSR.hdr.get("P-Asserted-Identity")
But I don’t see how to access the transformations. Am I missing it?
*Ben Kaufman*
__________________________________________________________
Kamailio - Users Mailing List - Non Commercial Discussions
* sr-users(a)lists.kamailio.org <mailto:sr-users@lists.kamailio.org>
Important: keep the mailing list in the recipients, do not reply only to the sender!
Edit mailing list options or unsubscribe:
* https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
<https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users>
--
Daniel-Constantin Mierla -- www.asipto.com <http://www.asipto.com>
www.twitter.com/miconda <http://www.twitter.com/miconda> --
www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda>
--
Daniel-Constantin Mierla -- www.asipto.com
www.twitter.com/miconda -- www.linkedin.com/in/miconda
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6 comments
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participants (3)
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Alex Balashov -
Ben Kaufman -
Daniel-Constantin Mierla