Okay, so if I understand you right, validate gets called twice: once
without the self hash initialized and once with it initialized. Seems
weird, but I can follow that. So, I might want to do something like:
if(self[:servers])
fail("Servers must be an array with at least one member") unless
self[:servers].is_a?(Array) and self[:servers].size > 0
end
Here's a follow-up then: how can you tell the difference between self just
not being initialized and the user failing to specify the value for a
particular property? I guess I'm mitigating it somewhat by doing:
newproperty(:servers,:array_matching=>:all) do
desc "List of database servers; first server in the list will be
considered the primary server"
* isrequired*
def insync?(is)
return false unless is == should
true
end
end
And properties that aren't required wouldn't need to differentiate between
not being set and just not initialized yet.
On Tuesday, August 11, 2015 at 2:27:06 PM UTC-4, Hunter Haugen wrote:
>
>
>
> On Fri, Aug 7, 2015 at 1:48 PM <[email protected] <javascript:>> wrote:
>
>> Hi all!
>>
>> I'm having trouble with a custom type's type-wide validate call. I've
>> done a lot of digging into the Puppet documentation and a lot of Googling
>> and haven't found a lot of guidance. My Puppet version is 3.7.5.
>>
>> Basically, I have a property defined like this in my type:
>>
>> newproperty(:servers,:array_matching=>:all) do
>> desc "List of database servers; first server in the list will be
>> considered the primary server"
>>
>> isrequired
>> def insync?(is)
>> return false unless is == should
>> true
>> end
>>
>> end
>>
>> I want to check that the array is non-empty. I figured out if I specify
>> a validate block inside of the newproperty block then I'll just get each
>> individual array member, one at a time, which isn't what I want. So,
>> instead, I implemented a type-wide validate call like this:
>>
>> Puppet::Type.newtype(:my_type) do
>>
>> validate do
>> fail("servers should have at least one member") if
>> self[:servers].size == 0
>> done
>>
>
> It's kind of awkward, but if your type uses self.instances, then in the
> validate block is run after self.instances runs and has
> resource.provider.servers but not self[:servers]. So I usually just do
> something like `if self[:servers] and self[:servers].size == 0` to avoid
> validating self.instances stuff.
>
> The validate block is then run again when each resource is evaluated, and
> that is when self's hash is populated with values from the catalog.
>
>>
>>
>> When I try to run puppet resource my_type, I get:
>>
>> Error: Could not run: undefined method `size' for nil:NilClass
>>
>> When I do a pp on self, I get something that looks like (in part):
>>
>> #<Puppet::Type::My_type:0x000000035f7528
>> @managed=false,
>> @name_var_cache=:name,
>> @original_parameters=
>> {:provider=>
>> #<Puppet::Type::My_type::ProviderMy_type:0x000000035d1350
>> @property_flush={},
>> @property_hash=
>> {
>> :servers=>["db1"],
>> },
>> @resource=#<Puppet::Type::My_type:0x000000035f7528 ...>>},
>> @parameters=
>> {
>> *snip*
>> },
>> @provider=
>> #<Puppet::Type::My_type::ProviderMy_type:0x000000035d1350
>> @property_flush={},
>> @property_hash=
>> {
>> :servers=>["db1"],
>> },
>> @resource=#<Puppet::Type::My_type:0x000000035f7528 ...>>,
>> @tags=
>> #<Puppet::Util::TagSet: {"my_type",
>> "mytitle"}>,
>> @title="mytitle">
>>
>> I poked around the types provided by Puppet and it looks like I should be
>> able to do
>>
>> self[:servers]
>>
>> to access the property, but in practice that doesn't seem to work. It
>> looks like the data I want is buried in the object, but I'm not sure of the
>> correct means to get at it.
>>
>>
>>
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