Future parser experiments: A question on params validation

[Alessandro Franceschi]

Hi all,

I've started to make some future parser versions of the most useful Tiny Puppet defines:

https://github.com/example42/puppet-tp/commit/78222a8e12542d0203b2bc600b7984fbf555a488

the main advantages I've seen, for this use case, is the neater and more concise parameters validation, and, for the tp::install4 define (https://github.com/example42/puppet-tp/blob/master/manifests/install4.pp) , the ability to cope with arrays of packages and services.

Another small change is the usage of the + operator on hashes instead of stdlib's merge().

There's probably more that can be done on them (any input or suggestions  is welcomed) , but in particular I have a point I'd like to fix.

When Parameters are undef by default I didn't find anything better than enforcing an "Any" type, which actually does not validate anything:

	define tp::conf4 (
	String $ensure = present,
	Any $source = undef,
	Any $template = undef,
	Any $epp = undef,
	Any $content = undef,

is there a concise way (without other verbose conditionals in the code) to validate a parameter type IF that parameter is passed when is undef by default? 

Any help appreciated,

al

[Henrik Lindberg]

Use the type Optional[T] to enforce either the type T, or undef. In your
example, say that $content must be a non empty string, or undef then you
could type it like this:

Optional[String[1]] $content = undef

Depending on what is accepted you can also use a Variant type with an
explicit Undef, this means the same thing as above:

Variant[Undef, String[1]] $content = undef

Hope that helps

- henrik

> Any help appreciated,
> al
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[Alessandro Franceschi]

Great,

exactly what I need. 

Thank you

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