Puppet users - Sep 2012 - Making a result of custom function available to multiple classes

Hey,

I''m using Puppet 2.7.19 with hiera 0.3.0. I have an Openvpn module
which
has a custom function that queries a mysql db and returns a hash. I also 
need the hash values in other modules e.g. firewall module. Since the 
custom function is in the openvpn/lib/puppet/parser/functions folder I 
believe it is autoloaded and is available from other modules. However, I 
don''t want to have to call the custom function multiple times as
it''s an
expensive mysql query. What would be the best way to call the custom 
function once and make the returned hash available to other modules? 

Thanks for your time!

Cheers,
J.

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Hi,

Since functions run on the Puppet Master side, the simplest solution is to 
cache the value if its "freshness" is not mandatory i.e. does not
change,
lets say every 5 minutes? Or, even it will be fine every 24 hours, etc ...

Consider this snippet: https://gist.github.com/3680388

Let me know if you have troubles adapting this for your function, I am 
always keen to help :)

KW

On Saturday, September 8, 2012 4:59:31 PM UTC+1, JeremyCampbell
wrote:
>
> Hey,
>
> I''m using Puppet 2.7.19 with hiera 0.3.0. I have an Openvpn module
which
> has a custom function that queries a mysql db and returns a hash. I also 
> need the hash values in other modules e.g. firewall module. Since the 
> custom function is in the openvpn/lib/puppet/parser/functions folder I 
> believe it is autoloaded and is available from other modules. However, I 
> don''t want to have to call the custom function multiple times as
it''s an
> expensive mysql query. What would be the best way to call the custom 
> function once and make the returned hash available to other modules? 
>
> Thanks for your time!
>
> Cheers,
> J.
>
>
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On Saturday, September 8, 2012 5:31:06 PM UTC-5, Krzysztof Wilczynski
wrote:
>
> Hi,
>
> Since functions run on the Puppet Master side, the simplest solution is to 
> cache the value if its "freshness" is not mandatory i.e. does not
change,
> lets say every 5 minutes? Or, even it will be fine every 24 hours, etc ...
>
> Consider this snippet: https://gist.github.com/3680388
>
> Let me know if you have troubles adapting this for your function, I am 
> always keen to help :)
>

And one form of caching the result would be to assign it to a class (or 
global) variable.  A class variable make sense to me, as you should have 
exactly one class responsible for actually running the function and 
assigning the result anyway.  That''s about as simple as you can do, and
it
would get you one function call per catalog compilation.

Caching the result outside of Puppet would allow you to reduce the number 
of function calls further.


John

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