New subject: hooking mechanism for routing blocks

26 Apr 2023

(also added sr-dev)

Hello,

It probably not exactly what you are looking for, but a common way for modules to provide
"hooks" towards the configuration for later extensions is about the event_route
facility. You can find many of this event routes used from modules (on simple example is
dispatcher module).

Inter-module communication or usage is usually facilitated by an API export from the
providing module, and an API import/binding on the consuming module. Examples here are the
usrloc and registrar modules. The sl module API is also used from many other modules to
send messages.

Cheers,

Henning  

-----Original Message-----
From: Valentin Christoph &lt;Christoph.Valentin(a)kontron.com&gt; 
Sent: Montag, 24. April 2023 15:44
To: Kamailio (SER) - Users Mailing List &lt;sr-users(a)lists.kamailio.org&gt;
Subject: [SR-Users] hooking mechanism for routing blocks

Dear all,

I am looking for some hooking mechanism for user defined routing blocks.

Is something like this already available?

1) a common part of the routing configuration shall not (or only slightly) be changed,
after some hooks have been implemented
     Something like a function "engage_hooks()" of some
"hook_module"?

     :
     Routing config that should not be changed by application developers
     engage_hooks(HOOK_TYPE);
     Routing config that should not be changed by application developers
     :

2) one application developer may "hook" new parts of the routing configuration
into this, by
     modparam("hook_module", "hook",
"name=MY_RB;type=HOOK_TYPE;prio=50);
     :
     :
     Route [MY_RB] {
          Do something at hook HOOK_TYPE;
     }
     :
     :

3) another application developer might want to "hook" into the same HOOK_TYPE
with a higher priority
     modparam("hook_module", "hook",
"name=ANOTHER_RB;type=HOOK_TYPE;prio=20);
     :
     :
     Route [ANOTHER_RB] {
          Do another thing with higher priority at hook HOOK_TYPE
     }
     :
     :

Kr,
Christoph
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Re: hooking mechanism for routing blocks