On 2015-09-01 13:27, Martin Alfke wrote:
Hi Thomas,
On 01 Sep 2015, at 09:59, Thomas Hallgren <thomas.hallg...@puppetlabs.com>
wrote:
Hi Martin,
The function API has evolved slightly since the blog entry that you're
referring to was written. The arg_count was removed since it was redundant and
confusing after we introduced the 'optional_param' and 'repeated_param'. You
can find the documentation for Puppet 4.2 functions here:
https://docs.puppetlabs.com/references/4.2.latest/developer/Puppet/Functions.html
Many thanks for pointing to the new updated documentation.
My idea is to create a functions which has 3 use cases:
- no parameter: return hostname of puppet master
- ip as parameter: return DNS resolved name
- hostname/fqdn as parameter: return IP address from DNS
How to check for explizit “no parameter”?
Create two dispatch entries. One that require a parameter and one where no parameter is declared. The one without a
parameter will be used when no argument is given. In this scenario, the check for ip or hostname must be done in the
method targeted by the dispatch with one parameter.
Alternatively, you could use three dispatch entries. One without a parameter (as before) and then two with parameters
using mutually exclusive regular expression types. One matching the IP and another matching hostname/fdqn. Something
like this:
dispatch :no_param do
end
dispatch :ip_param do
param 'Regexp[/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/]', :ip
end
dispatch :fqdn_param do
param 'Regexp[/^([a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,}$/]', fdqn
end
def no_param
return puppet master hostname
def
def ip_param(ip)
...
end
def fqdn_param(ip)
...
end
- thomas
- thomas
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