[aws|elasticache] implement describe_cache_groups request

lib/fog/aws/elasticache.rb

@@ -22,7 +22,7 @@ module Fog
       request :modify_cache_parameter_group
       request :reset_cache_parameter_group
       request :describe_engine_default_parameters
-      #request :describe_cache_parameters
+      request :describe_cache_parameters
 
       request :create_cache_security_group
       request :delete_cache_security_group

lib/fog/aws/parsers/elasticache/describe_cache_parameters.rb

@@ -0,0 +1,22 @@
+module Fog
+  module Parsers
+    module AWS
+      module Elasticache
+        require 'fog/aws/parsers/elasticache/engine_defaults_parser'
+
+        class DescribeCacheParameters < EngineDefaultsParser
+
+          def end_element(name)
+            case name
+            when 'DescribeCacheParametersResult'
+              @response[name] = @engine_defaults
+              reset_engine_defaults
+            else
+              super
+            end
+          end
+        end
+      end
+    end
+  end
+end

lib/fog/aws/requests/elasticache/describe_cache_parameters.rb

@@ -0,0 +1,36 @@
+module Fog
+  module AWS
+    class Elasticache
+      class Real
+
+        require 'fog/aws/parsers/elasticache/describe_cache_parameters'
+
+        # Returns a list of CacheParameterGroup descriptions
+        #
+        # === Parameters (optional)
+        # * name <~String> - The name of an existing cache parameter group
+        # * options <~Hash> (optional):
+        # *  :marker <~String> - marker provided in the previous request
+        # *  :max_records <~Integer> - the maximum number of records to include
+        # *  :source <~String> - the parameter types to return.
+        def describe_cache_parameters(name = nil, options = {})
+          request({
+            'Action'                  => 'DescribeCacheParameters',
+            'CacheParameterGroupName' => name,
+            'Marker'                  => options[:marker],
+            'MaxRecords'              => options[:max_records],
+            'Source'                  => options[:source],
+            :parser => Fog::Parsers::AWS::Elasticache::DescribeCacheParameters.new
+          })
+        end
+
+      end
+
+      class Mock
+        def describe_cache_parameters(name = nil, options = {})
+          Fog::Mock.not_implemented
+        end
+      end
+    end
+  end
+end

tests/aws/requests/elasticache/helper.rb

@@ -25,12 +25,11 @@ class AWS
       SINGLE_PARAMETER_GROUP = BASIC.merge('CacheParameterGroup' => PARAMETER_GROUP)
       DESCRIBE_PARAMETER_GROUPS = BASIC.merge('CacheParameterGroups' => [PARAMETER_GROUP])
       MODIFY_PARAMETER_GROUP = {'CacheParameterGroupName' => String }
-      ENGINE_DEFAULTS = {
-        'CacheParameterGroupFamily'       => String,
+      PARAMETER_SET = {
         'Parameters'                      => Array,
         'CacheNodeTypeSpecificParameters' => Array,
       }
-
+      ENGINE_DEFAULTS = PARAMETER_SET.merge('CacheParameterGroupFamily' => String)
       # Cache Clusters - more parameters get added as the lifecycle progresses
       CACHE_CLUSTER = {
         'AutoMinorVersionUpgrade'     => String,  # actually TrueClass or FalseClass

tests/aws/requests/elasticache/parameter_group_tests.rb

@@ -26,6 +26,14 @@ Shindo.tests('AWS::Elasticache | parameter group requests', ['aws', 'elasticache
       body
     end
 
+    tests(
+    '#describe_cache_parameters'
+    ).formats(AWS::Elasticache::Formats::PARAMETER_SET) do
+      response = AWS[:elasticache].describe_cache_parameters(name)
+      parameter_set = response.body['DescribeCacheParametersResult']
+      parameter_set
+    end
+
     tests(
     '#describe_cache_parameter_groups without options'
     ).formats(AWS::Elasticache::Formats::DESCRIBE_PARAMETER_GROUPS) do