[sr-dev] Fwd: module writing & per message variable within my module

[Olle E. Johansson]

On 08 May 2014, at 08:59, jay binks <jaybinks at gmail.com> wrote:

> So id love to read somewhere more about structures in kamailio at a high level..
> is there a more interactive place to discuss these concepts ?? say IRC, google hangouts or something ??
> ( without having to bug the whole list )
We have a channel on IRC, but there is not a lot of activity there. A few of us are always connected.
> 
> can you explain what the differences are when you say "avp stored in the transaction" and process variables ?
> do you literally mean variables in my module here, or are these some kind of structure attached to the sip_msg ?
Read the docs on AVPs, shared variables (shv) process variables (var). They are all stored in different memory and related to different things.

> 
> effectively what im looking to do is store some custom data against sip_msg* that I can use later if I need to.
When is later? In another request or in the response to the same request? If there's a stateful transaction,
AVPs are reachable in response processing.
> 
> my reason for doing a module is that I had a few things I wanted to do in a module ( looking up large data structures for performance reasons ), and im implementing a few other bits of business logic in this module.
Still doesn't explain why you need to code it in c and make it a modules. You can do a lot in the existing
logic.

> 
> im happy to discuss further if you want to gtalk me ( on this email address )
I would suggest that you read up on the available docs and then find us in the IRC channel where we try to be available and answer when it works for us. If you really need fast help and responses, many of us are available as consultants.

In general, you have to be a bit more exact in your questions to get good answers on -dev, a bit less on -users. Your original e-mail was a bit too inexact so it wasn't easy to answer, which lead to everyone thinking that someone else may understand and may answer...  Before reposting to a mailing list, try to figure out why no one answered and add information to make it easier to answer.

/O
> 
> Jay
> 
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> 
> On 8 May 2014 16:52, Olle E. Johansson <oej at edvina.net> wrote:
> 
> On 08 May 2014, at 08:49, jay binks <jaybinks at gmail.com> wrote:
> 
>> Sorry to repost this but, Im still looking for answers.
>> is there a better place to be asking these questions ??
>> 
>> Jay
>> 
>> ---------- Forwarded message ----------
>> From: jay binks <jaybinks at gmail.com>
>> Date: 19 March 2014 19:18
>> Subject: module writing & per message variable within my module
>> To: sr-dev <sr-dev at lists.sip-router.org>
>> 
>> 
>> So Im writing a custom module to implement some of our business logic,
>> there are a few steps that im building into the module,  for example
>> 
>> conform_callerid
>> conform_destination 
>> 
>> what I want to achive should be fairly simple, but let me explain and im sure someone will tell me where to look.
>> 
>> when I call conform_callerid, I want to store a few bits of info so Initially I store them in a global variable ( yup lazy & dangerous I guess )
>> 
>> then I write the pv "get" function, to return the value from the global.
>> 
>> this was only done as a quick proof of concept.
>> but being global, im sure the variable will be overwritten by other message etc etc..
>> 
>> so I effectively want to store some custom fields against the message.
>> I didnt see this on the msg structure, but maybe I missed something
>> 
>> or is there a better way to achieve this ??
>> 
>> basically I want to be able to call conform_callerid 
>> then when I call conform_destination I want to look at some fields from the conform_callerid process  ( within the context of the message we are processing )
>> 
>> any pointers would be appreciated.
> 
> avps are stored in the transaction, process variablees in the process. You don't clearly say in which context you want to "save" the data and when you want to "use" it so it's hard to answer this.
> 
> Why do you need to write a module for this? What is it you can not do in the scripts?
> 
> /O
> 
> 
> 
> 
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> 
> -- 
> Sincerely
> 
> Jay
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