Move edit info into xblock and runtime mixins

LMS-11183, LMS-11184

cms/envs/common.py

@@ -38,6 +38,7 @@ from warnings import simplefilter
 
 from lms.lib.xblock.mixin import LmsBlockMixin
 from dealer.git import git
+from xmodule.modulestore.edit_info import EditInfoMixin
 
 ############################ FEATURE CONFIGURATION #############################
 
@@ -254,7 +255,7 @@ from xmodule.x_module import XModuleMixin
 
 # This should be moved into an XBlock Runtime/Application object
 # once the responsibility of XBlock creation is moved out of modulestore - cpennington
-XBLOCK_MIXINS = (LmsBlockMixin, InheritanceMixin, XModuleMixin)
+XBLOCK_MIXINS = (LmsBlockMixin, InheritanceMixin, XModuleMixin, EditInfoMixin)
 
 # Allow any XBlock in Studio
 # You should also enable the ALLOW_ALL_ADVANCED_COMPONENTS feature flag, so that

common/lib/xmodule/xmodule/modulestore/edit_info.py

@@ -0,0 +1,101 @@
+"""
+Access methods to get EditInfo for xblocks
+"""
+from xblock.fields import XBlockMixin
+from abc import ABCMeta, abstractmethod
+
+
+class EditInfoMixin(XBlockMixin):
+    """
+    Provides the interfaces for getting the edit info from XBlocks
+    """
+    @property
+    def edited_by(self):
+        """
+        The user id of the last user to change this xblock content, children, or settings.
+        """
+        return self.runtime.get_edited_by(self)
+
+    @property
+    def edited_on(self):
+        """
+        The datetime of the last change to this xblock content, children, or settings.
+        """
+        return self.runtime.get_edited_on(self)
+
+    @property
+    def subtree_edited_by(self):
+        """
+        The user id of the last user to change content, children, or settings in this xblock's subtree
+        """
+        return self.runtime.get_subtree_edited_by(self)
+
+    @property
+    def subtree_edited_on(self):
+        """
+        The datetime of the last change content, children, or settings in this xblock's subtree
+        """
+        return self.runtime.get_subtree_edited_on(self)
+
+    @property
+    def published_by(self):
+        """
+        The user id of the last user to publish this specific xblock (or a previous version of it).
+        """
+        return self.runtime.get_published_by(self)
+
+    @property
+    def published_on(self):
+        """
+        The datetime of the last time this specific xblock was published.
+        """
+        return self.runtime.get_published_on(self)
+
+
+class EditInfoRuntimeMixin(object):
+    """
+    An abstract mixin class for the functions which the :class: `EditInfoMixin` methods call on the runtime
+    """
+    __metaclass__ = ABCMeta
+
+    @abstractmethod
+    def get_edited_by(self, xblock):
+        """
+        The datetime of the last change to this xblock content, children, or settings.
+        """
+        pass
+
+    @abstractmethod
+    def get_edited_on(self, xblock):
+        """
+        The datetime of the last change to this xblock content, children, or settings.
+        """
+        pass
+
+    @abstractmethod
+    def get_subtree_edited_by(self, xblock):
+        """
+        The user id of the last user to change content, children, or settings in this xblock's subtree
+        """
+        pass
+
+    @abstractmethod
+    def get_subtree_edited_on(self, xblock):
+        """
+        The datetime of the last change content, children, or settings in this xblock's subtree
+        """
+        pass
+
+    @abstractmethod
+    def get_published_by(self, xblock):
+        """
+        The user id of the last user to publish this specific xblock (or a previous version of it).
+        """
+        pass
+
+    @abstractmethod
+    def get_published_on(self, xblock):
+        """
+        The datetime of the last time this specific xblock was published.
+        """
+        pass

common/lib/xmodule/xmodule/x_module.py

@@ -724,7 +724,7 @@ class XModuleDescriptor(XModuleMixin, HTMLSnippet, ResourceTemplates, XBlock):
         # leaving off original_version since it complicates creation w/o any obv value yet and is computable
         # by following previous until None
         # definition_locator is only used by mongostores which separate definitions from blocks
-        self.edited_by = self.edited_on = self.previous_version = self.update_version = self.definition_locator = None
+        self.previous_version = self.update_version = self.definition_locator = None
         self.xmodule_runtime = None
 
     @classmethod