(CONT-1023) - Enhancing deferrable_epp to support nested hash

functions/deferrable_epp.pp

@@ -6,7 +6,7 @@
 # have to explicitly pass the entire scope to the client.
 #
 function stdlib::deferrable_epp(String $template, Hash $variables) >> Variant[String, Sensitive[String], Deferred] {
-  if $variables.any |$key, $value| { $value.is_a(Deferred) } {
+  if $variables.nested_values.any |$value| { $value.is_a(Deferred) } {
     Deferred(
       'inline_epp',
       [find_template($template).file, $variables],

lib/puppet/functions/nested_values.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+# This function will return list of Hash values, the return value will be Array
+# NOTE : This function is expecting only Hash and return value will be Array
+#
+# @example :
+# $hash = {
+#   "key1" => "value1",
+#   "key2" => { "key2.1" => "value2.1"}
+# }
+# $hash.nested_values
+#
+# Output : ["value1", "value2.1"]
+#
+Puppet::Functions.create_function(:nested_values) do
+  dispatch :nested_values do
+    param 'Hash', :options
+    return_type 'Array'
+  end
+
+  def nested_values(options)
+    options.each_with_object([]) do |(_k, v), values|
+      v.is_a?(Hash) ? values.concat(nested_values(v)) : (values << v)
+    end
+  end
+end

spec/functions/nested_values_spec.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'nested_values' do
+  # please note that these tests are examples only
+  # you will need to replace the params and return value
+  # with your expectations
+  it { is_expected.to run.with_params({}).and_return([]) }
+  it { is_expected.to run.with_params({ 'key' => 'value' }).and_return(['value']) }
+  it { is_expected.to run.with_params({ 'key' => { 'key1' => 'value1', 'key2' => 'value2' } }).and_return(['value1', 'value2']) }
+  it { is_expected.to run.with_params({ 'key1' => 'value1', 'key2' => { 'key1' => 'value21', 'key2' => 'value22' }, 'key3' => 'value3' }).and_return(['value1', 'value21', 'value22', 'value3']) }
+  it { is_expected.to run.with_params(2).and_raise_error(StandardError) }
+  it { is_expected.to run.with_params(nil).and_raise_error(StandardError) }
+end