Class: Puppet::Pops::Loader::PuppetResourceTypeImplInstantiator

Inherits:
Object
  • Object
show all
Defined in:
lib/puppet/pops/loader/puppet_resource_type_impl_instantiator.rb

Overview

The PuppetResourceTypeImplInstantiator instantiates a Puppet::Pops::ResourceTypeImpl object. given a Puppet Programming language source that when called evaluates the Puppet logic it contains.

Class Method Summary collapse

Class Method Details

.create(loader, typed_name, source_ref, pp_code_string) ⇒ Puppet::Pops::ResourceTypeImpl

Produces an instance of Puppet::Pops::ResourceTypeImpl, or fails with an error if the given puppet source does not produce such an instance when evaluated.

Parameters:

  • loader (Loader)

    The loader the function is associated with

  • typed_name (TypedName)

    the type / name of the resource type impl to load

  • source_ref (URI, String)

    a reference to the source / origin of the puppet code to evaluate

  • pp_code_string (String)

    puppet code in a string

Returns:

  • (Puppet::Pops::ResourceTypeImpl)
    • an instantiated ResourceTypeImpl


17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
# File 'lib/puppet/pops/loader/puppet_resource_type_impl_instantiator.rb', line 17

def self.create(loader, typed_name, source_ref, pp_code_string)
  parser = Parser::EvaluatingParser.new()

  # parse and validate
  model = parser.parse_string(pp_code_string, source_ref)
  statements = if model.is_a?(Model::Program)
                 if model.body.is_a?(Model::BlockExpression)
                   model.body.statements
                 else
                   [model.body]
                 end
               else
                 EMPTY_ARRAY
               end
  statements = statements.reject { |s| s.is_a?(Model::Nop) }
  if statements.empty?
    raise ArgumentError, _("The code loaded from %{source_ref} does not create the resource type '%{type_name}' - it is empty") % { source_ref: source_ref, type_name: typed_name.name }
  end

  rname = Resource::ResourceTypeImpl._pcore_type.name
  unless statements.find do |s|
    if s.is_a?(Model::CallMethodExpression)
      functor_expr = s.functor_expr
      functor_expr.is_a?(Model::NamedAccessExpression) &&
        functor_expr.left_expr.is_a?(Model::QualifiedReference) &&
        functor_expr.left_expr.cased_value == rname &&
        functor_expr.right_expr.is_a?(Model::QualifiedName) &&
        functor_expr.right_expr.value == 'new'
    else
      false
    end
  end
    raise ArgumentError, _("The code loaded from %{source_ref} does not create the resource type '%{type_name}' - no call to %{rname}.new found.") % { source_ref: source_ref, type_name: typed_name.name, rname: rname }
  end

  unless statements.size == 1
    raise ArgumentError, _("The code loaded from %{source_ref} must contain only the creation of resource type '%{type_name}' - it has additional logic.") % { source_ref: source_ref, type_name: typed_name.name }
  end

  closure_scope = Puppet.lookup(:global_scope) { {} }
  resource_type_impl = parser.evaluate(closure_scope, model)

  unless resource_type_impl.is_a?(Puppet::Pops::Resource::ResourceTypeImpl)
    got = resource_type.class
    raise ArgumentError, _("The code loaded from %{source_ref} does not define the resource type '%{type_name}' - got '%{got}'.") % { source_ref: source_ref, type_name: typed_name.name, got: got }
  end

  unless resource_type_impl.name == typed_name.name
    expected = typed_name.name
    actual = resource_type_impl.name
    raise ArgumentError, _("The code loaded from %{source_ref} produced resource type with the wrong name, expected '%{expected}', actual '%{actual}'") % { source_ref: source_ref, expected: expected, actual: actual }
  end

  # Adapt the resource type definition with loader - this is used from logic contained in it body to find the
  # loader to use when making calls to the new function API. Such logic have a hard time finding the closure (where
  # the loader is known - hence this mechanism
  Adapters::LoaderAdapter.adapt(resource_type_impl).loader_name = loader.loader_name
  resource_type_impl
end