Re: [PATCH] Abstraction for config resources, allowing file, URL, pipe, etc.

Hi Stipe

What about a "fallback config" ?

If kannel is started/restarted with the URL option and can't access
the remote config file it wouldn't start

Regards

Alvaro


On 10/18/12, Stipe Tolj <[email protected]> wrote:
> Hi list,
>
> I have abstracted the gwlib/cfg.[ch] module in order not to handle
> simply a 'config file', but a 'config resource', which then can be
> either of:
>
> - a config file
> - a config URL, retrieving the config via the HTTP body
> - the stdin pipe, allowing to pipe in a config
> - a data block itself, interpreted as config
>
> Now, to demonstrate the effect, here are some sample ways on how
> Kannel's daemon can be then started:
>
>    $ bearerbox
>
> will look for 'kannel.conf', as it does today.
>
>    $ bearerbox smskannel.conf
>
> will open the local 'smskannel.conf' file, parse and expand it, as it
> does today.
>
>    $ bearebox http://host/smskannel.conf
>
> will HTTP GET to the URL and pull the config from the HTTP response body.
>
>    $ cat smskannel.conf | bearerbox pipe
>
> will instruct bearerbox to read in the config from the stdin pipe.
>
> Ok, sounds sweet, right? But is there more? Yes, there is. Due that the
> gwlib/cfg.[ch] module is abstracted on these "types" of resources for
> the config, we can mix them using the 'include = <resource>' statement.
>
> I.e. I can have a local smskannel.conf that includes a remote URL config
> part, or I can fetch a remote URL config block, but refer again to local
> config files, etc.
>
> Now you may ask what's this used for, you have been living quite fine
> with the normal local config style, or even have sync'ed configs via
> rsync to achieve HA setups?
>
> Yes, sync'ing the filesystem is a way to make "remote changes" for a
> Kannel worker node. But I wanted something that is even more simple,
> like the HTTP URL call fetching of the config.
>
> This allows a "controler node" to instruct how the Kannel "worker nodes"
> will operate. Meaning, to which SMSCs they connect, which sms-services
> they need to obey, etc.
>
> It makes things simply more flexible, especially when you start to look
> at large scalability, HA and LB issues.
>
> The patchset can be found at URL:
> http://www.kannel.org/~tolj/patchsets/cfg/gateway-cfg.diff
>
> NOTE: The user's guide part is still missing, I'll make sure this gets
> into the patchset before committing.
>
> Reviews, comments, votes welcome.
>
> Stipe
>
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>
> tolj.org system architecture      Kannel Software Foundation (KSF)
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>
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>


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