I desire the ability to access DSL class parameters from within a
provider. Similar to the pattern that is frequently seen with DSL
defined types and a controlling class within a module. AFAIK, the
alternatives for sharing data are ugly. Including: forcing the user to
declare facts via ENC or an external fact source, using a file resource
for "local IPC" (or sysv shm...), or adding parameters to the type and
using a DSL defined type as wrapper. The later is the least
objectionable but feels like it should be unnecessary; the data is
already in the catalog.
Accessing the catalog from within a provider instance isn't very
difficult since the instantiated resource has an accessor for it. Eg.
`resource.catalog` Where I've hit a roadblock is trying to access the
catalog from a class method. I've spent several hours poking at classes
looking for an instance I could pry into or a singleton I could access
without much luck. There was a suggestion on #puppet that it might be
possible to obtain it via the indirector. I don't understand the
indirection facility but I don't believe it has knowledge beyond the
name of the catalog class. Eg.
`Puppet::Indirector::Indirection.instance(:catalog).instance_variable_get(:@indirected_class).class`
Perhaps I'm in error? I also failed to identify a reference back to the
current transaction.
My last resort was to try passing the catalog from the resource to the
provider as class data. This is problematic in that I can't identify a
place to "hook" in that runs after both
`Puppet::Util::ClassGen.genclass` and the providers are associated with
a type but before the provider's class instances method is called. I've
been resisting the temptation to stuff something into the
`Puppet::Type.provide` method's option hash and monkey patching my way
to victory...
I did have some limited success in that I was able to get into the
catalog from `::prefetch` by adding class accessors for `catalog` to the
provider and dropping this snippet into an autorequire block.
if provider.class.respond_to?(:catalog)
provider.class.catalog = catalog
end
Of course, where I want access to the catalog data is from
`::instances`. Have I missed something obvious?
Cheers,
-Josh
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