WMI utility refactoring

2 files changed, 126 insertions, 0 deletions

diff --git a/lib/ohai/util/wmi.rb b/lib/ohai/util/wmi.rb
new file mode 100644
index 00000000..03e6af0f
--- /dev/null
+++ b/lib/ohai/util/wmi.rb
@@ -0,0 +1,77 @@
+#
+# Author:: Adam Edwards (<adamed@getchef.com>)
+# Copyright:: Copyright 2014 Chef Software, Inc.
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+require 'win32ole'
+require 'ohai/util/wmi/wmi_instance'
+
+module Ohai
+  module Util
+    class Wmi
+
+      def self.query(wql_query, namespace = nil)
+        results = start_query(namespace, wql_query)
+        
+        result_set = []
+
+        results.each do | result | 
+          result_set.push(Wmi::Instance.new(result))
+        end
+        
+        result_set
+      end
+
+      def self.instances_of(wmi_class, namespace = nil)
+        query("select * from #{wmi_class}")
+      end
+
+      def self.first_of(wmi_class, namespace = nil)
+        query_result = start_query(namespace, "select * from #{wmi_class}")
+        first_result = nil
+        query_result.each do | record |
+          first_result = record
+          break
+        end
+        first_result.nil? ? nil : Wmi::Instance.new(first_result)
+      end
+
+      private
+
+      def self.start_query(namespace, wql_query)
+        connection = new_connection(namespace)
+        connection.ExecQuery(wql_query)
+      end
+
+      def self.new_connection(namespace)
+        locator = WIN32OLE.new("WbemScripting.SWbemLocator")
+        locator.ConnectServer('.', namespace.nil? ? 'root/cimv2' : namespace)
+      end
+
+      def self.wmi_result_to_hash(wmi_object)
+        property_map = {}
+        wmi_object.properties_.each do |property|
+          property_map[property.name.downcase] = wmi_object.invoke(property.name)
+        end
+
+        property_map[:wmi_object] = wmi_object
+
+        property_map
+      end
+    end
+  end
+end
+
diff --git a/lib/ohai/util/wmi/wmi_instance.rb b/lib/ohai/util/wmi/wmi_instance.rb
new file mode 100644
index 00000000..6b46a957
--- /dev/null
+++ b/lib/ohai/util/wmi/wmi_instance.rb
@@ -0,0 +1,49 @@
+#
+# Author:: Adam Edwards (<adamed@getchef.com>)
+# Copyright:: Copyright 2014 Chef Software, Inc.
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+module Ohai
+  module Util
+   class Wmi
+      class Instance
+
+        attr_reader :wmi_ole_object
+
+        def initialize(wmi_ole_object)
+          @wmi_ole_object = wmi_ole_object
+          @property_map = wmi_ole_object_to_hash(wmi_ole_object)
+        end
+
+        def [](key)
+          @property_map[key]
+        end
+
+        private
+
+        def wmi_ole_object_to_hash(wmi_object)
+          property_map = {}
+          wmi_object.properties_.each do |property|
+            property_map[property.name.downcase] = wmi_object.invoke(property.name)
+          end
+
+          property_map[:wmi_object] = wmi_object
+
+          property_map.freeze
+        end
+      end
+    end
+  end
+end