Introduce tripleo::config

tripleo::config is a class that will take care of param_config in THT.

Example in THT:

puppet_config:
  param_config:
    aodh_config:
      oslo_middleware:
        enable_proxy_headers_parsing: True

tripleo::config will call the aodh_config provider for each
parameter and its value, so here it'll call:

create_resources('aodh_config',
                 'oslo_middleware/enable_proxy_headers_parsing' => {
                   'value' => True
                 } )

Note: we add a filter capability where once can configure
tripleo::config with providers parameter to filter which providers we
want to call.

Change-Id: Ia008917475edcd086fb5076fab320206d05ea557

manifests/config.pp

@@ -0,0 +1,44 @@
+# == Class: tripleo::config
+#
+# Configure services with Puppet
+#
+# === Parameters:
+#
+# [*configs*]
+#   (optional) Configuration to inject.
+#   Should be an hash.
+#   Default to lookup('param_config', {})
+#
+# [*providers*]
+#   (optional) Filter the providers we want
+#   to use for config.
+#   Should be an array.
+#   Default to lookup('param_providers', Array[String], 'deep', [])
+#
+class tripleo::config(
+  $configs   = lookup('param_config', {}),
+  $providers = lookup('param_providers', Array[String], 'deep', []),
+) {
+
+  if ! empty($configs) {
+    # Allow composable services to load their own configurations.
+    # Each service can load its config options by using this form:
+    #
+    # puppet_config:
+    #   param_config:
+    #     'aodh_config':
+    #       DEFAULT:
+    #         foo: fooValue
+    #         bar: barValue
+    $configs.each |$provider, $sections| {
+      if empty($providers) or ($provider in $providers) {
+        $sections.each |$section, $params| {
+          $params.each |$param, $value| {
+            create_resources($provider, {"${section}/${param}" => {'value' => $value }})
+          }
+        }
+      }
+    }
+  }
+
+}

spec/classes/tripleo_config_spec.rb

@@ -0,0 +1,45 @@
+require 'spec_helper'
+
+describe 'tripleo::config' do
+
+  let :params do
+    { }
+  end
+
+  shared_examples_for 'tripleo::config' do
+    context 'with glance_api service' do
+      before :each do
+        params.merge!(
+          :configs => { 'glance_api_config' => { 'DEFAULT' => { 'foo' => 'bar', 'foo2' => 'bar2' } } },
+        )
+      end
+      it 'configures arbitrary glance-api configurations' do
+        is_expected.to contain_glance_api_config('DEFAULT/foo').with_value('bar')
+        is_expected.to contain_glance_api_config('DEFAULT/foo2').with_value('bar2')
+      end
+    end
+
+    context 'with glance_api service and provider filter' do
+      before :each do
+        params.merge!(
+          :configs   => { 'glance_api_config' => { 'DEFAULT' => { 'foo' => 'bar' } }, 'nova_config' => { 'DEFAULT' => { 'foo' => 'bar' } } },
+          :providers => ['glance_api_config'],
+        )
+      end
+      it 'configures arbitrary glance-api configurations without nova_config' do
+        is_expected.to contain_glance_api_config('DEFAULT/foo').with_value('bar')
+        is_expected.to_not contain_nova_config('DEFAULT/foo').with_value('bar')
+      end
+    end
+  end
+
+  on_supported_os.each do |os, facts|
+    context "on #{os}" do
+      let(:facts) do
+        facts.merge({})
+      end
+
+      it_behaves_like 'tripleo::config'
+    end
+  end
+end