add a namespace resolver

cms/startup.py

@@ -16,6 +16,7 @@ from openedx.core.djangoapps.course_groups.scope_resolver import CourseGroupScop
 from student.scope_resolver import CourseEnrollmentsScopeResolver, StudentEmailScopeResolver
 from projects.scope_resolver import GroupProjectParticipantsScopeResolver
 from edx_notifications.scopes import register_user_scope_resolver
+from util.namespace_resolver import CourseNamespaceResolver
 
 log = logging.getLogger(__name__)
 
@@ -88,13 +89,16 @@ def startup_notification_subsystem():
     try:
         startup.initialize()
 
-        # register the two scope resolvers that the LMS will be providing
+        # register the scope resolvers that the runtime will be providing
         # to edx-notifications
         register_user_scope_resolver('course_enrollments', CourseEnrollmentsScopeResolver())
         register_user_scope_resolver('course_group', CourseGroupScopeResolver())
         register_user_scope_resolver('group_project_participants', GroupProjectParticipantsScopeResolver())
         register_user_scope_resolver('group_project_workgroup', GroupProjectParticipantsScopeResolver())
         register_user_scope_resolver('student_email_resolver', StudentEmailScopeResolver())
+
+        # register namespace resolver
+        register_namespace_resolver(CourseNamespaceResolver())
     except Exception, ex:
         # Note this will fail when we try to run migrations as manage.py will call startup.py
         # and startup.initialze() will try to manipulate some database tables.

common/djangoapps/student/scope_resolver.py

@@ -33,7 +33,7 @@ class CourseEnrollmentsScopeResolver(NotificationUserScopeResolver):
         The entry point to resolve a scope_name with a given scope_context
         """
 
-        if scope_name != 'course_enrollments' and scope_name != 'namespace_scope':
+        if scope_name != 'course_enrollments':
             # we can't resolve any other scopes
             return None
 
@@ -51,12 +51,44 @@ class CourseEnrollmentsScopeResolver(NotificationUserScopeResolver):
         else:
             course_key = course_id
 
-        if scope_name == 'course_enrollments':
         return CourseEnrollment.objects.values_list('user_id', flat=True).filter(
             is_active=1,
             course_id=course_key
         )
-        elif scope_name == 'namespace_scope':
+
+
+class NamespaceEnrollmentsScopeResolver(NotificationUserScopeResolver):
+    """
+    Implementation of the NotificationUserScopeResolver abstract
+    interface defined in edx-notifications.
+
+    We will be passed in a namespace (aka course_id) in the context
+    and we must return a Django ORM resultset or None if
+    we cannot match.
+    """
+
+    def resolve(self, scope_name, scope_context, instance_context):
+        """
+        The entry point to resolve a scope_name with a given scope_context
+        """
+
+        if scope_name != 'namespace_scope':
+            # we can't resolve any other scopes
+            return None
+
+        if 'namespace' not in scope_context:
+            # did not receive expected parameters
+            return None
+
+        course_id = scope_context['namespace']
+
+        if not isinstance(course_id , CourseKey):
+            try:
+                course_key = CourseKey.from_string(course_id)
+            except InvalidKeyError:
+               course_key = SlashSeparatedCourseKey.from_deprecated_string(course_id)
+        else:
+            course_key = course_id
 
         query = User.objects.select_related('courseenrollment')
 

common/djangoapps/student/tests/test_scope_resolver.py

@@ -7,7 +7,11 @@ from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.factories import CourseFactory
 
 from student.models import CourseEnrollment
-from student.scope_resolver import CourseEnrollmentsScopeResolver, StudentEmailScopeResolver
+from student.scope_resolver import (
+    CourseEnrollmentsScopeResolver,
+    StudentEmailScopeResolver,
+    NamespaceEnrollmentsScopeResolver
+)
 
 
 class StudentTasksTestCase(ModuleStoreTestCase):
@@ -89,12 +93,12 @@ class StudentTasksTestCase(ModuleStoreTestCase):
         enrollment.is_active = False
         enrollment.save()
 
-        resolver = CourseEnrollmentsScopeResolver()
+        resolver = NamespaceEnrollmentsScopeResolver()
 
         users = resolver.resolve(
             'namespace_scope',
             {
-                'course_id': self.course.id,
+                'namespace': self.course.id,
                 'fields': {
                     'id': True,
                     'email': True,

common/djangoapps/util/namespace_resolver.py

+"""
+A namespace resolver for edx-notifications. This basically translates a namespace
+into information about the namespace
+"""
+
+from xmodule.modulestore.django import modulestore
+from student.scope_resolver import NamespaceEnrollmentsScopeResolver
+from edx_notifications.namespaces import NotificationNamespaceResolver
+
+from opaque_keys.edx.keys import CourseKey
+from opaque_keys import InvalidKeyError
+from opaque_keys.edx.locations import SlashSeparatedCourseKey
+
+
+class CourseNamespaceResolver(NotificationNamespaceResolver):
+    """
+    An implementation of NotificationNamespaceResolver which treats
+    namespaces as courses
+    """
+
+    def resolve(self, namespace, instance_context):
+        """
+        Namespace resolvers will return this information as a dict:
+
+        {
+            'namespace': <String> ,
+            'display_name': <String representing a human readible name for the namespace>,
+            'features': {
+                'digests': <boolean, saying if namespace supports a digest>
+            },
+            'default_user_resolver': <pointer to a UserScopeResolver instance>
+        }
+        or None if the handler cannot resolve it
+        """
+
+        # namespace = course_id
+        course_id = namespace
+
+        if not isinstance(course_id, CourseKey):
+            try:
+                course_key = CourseKey.from_string(course_id)
+            except InvalidKeyError:
+                try:
+                   course_key = SlashSeparatedCourseKey.from_deprecated_string(course_id)
+                except InvalidKeyError:
+                    return None
+        else:
+            course_key = course_id
+
+        course = modulestore().get_course(course_key)
+
+        if not course:
+            # not found, we can't resolve it
+            return None
+
+        # return expected results to caller per the interface contract
+        return {
+            'namespace': course_id,
+            'display_name': course.display_name,
+            'features': {
+                'digests': course.has_started() and not course.has_ended(),
+            },
+            'default_user_resolver': NamespaceEnrollmentsScopeResolver(),
+        }
+
+

common/djangoapps/util/tests/test_namespace_resolver.py

+"""
+Unit tests for namespace_resolver.py
+"""
+
+from django.test import TestCase
+
+from datetime import datetime
+
+from xmodule.modulestore.tests.factories import CourseFactory
+from util.namespace_resolver import CourseNamespaceResolver
+
+from student.scope_resolver import NamespaceEnrollmentsScopeResolver
+
+
+class NamespaceResolverTests(TestCase):
+    """
+    Tests for the CourseNamespaceResolver
+    """
+
+    def setUp(self):
+        """
+        Test initialization
+        """
+
+        self.course = CourseFactory(
+            org='foo',
+            start=datetime(1980, 1, 1),
+            end=datetime(2200, 1, 1)
+        )
+        self.closed_course = CourseFactory(
+            org='bar',
+            start=datetime(1975, 1, 1),
+            end=datetime(1980, 1, 1)
+        )
+        self.not_open_course = CourseFactory(
+            org='baz',
+            start=datetime(2200, 1, 1),
+            end=datetime(2222, 1, 1)
+        )
+
+    def test_resolve_namespace(self):
+        """
+        Make sure the interface is properly implemented
+        """
+
+        resolver = CourseNamespaceResolver()
+
+        # can't resolve a non existing course
+        self.assertIsNone(resolver.resolve('foo', None))
+
+        # happy path
+        result = resolver.resolve(self.course.id, None)
+
+        self.assertIsNotNone(result)
+        self.assertEqual(result['namespace'], self.course.id)
+        self.assertEqual(result['display_name'], self.course.display_name)
+        self.assertTrue(isinstance(result['default_user_resolver'], NamespaceEnrollmentsScopeResolver))
+        self.assertTrue(result['features']['digests'])
+
+        # course that is closed
+        result = resolver.resolve(self.closed_course.id, None)
+
+        self.assertIsNotNone(result)
+        self.assertEqual(result['namespace'], self.closed_course.id)
+        self.assertEqual(result['display_name'], self.closed_course.display_name)
+        self.assertTrue(isinstance(result['default_user_resolver'], NamespaceEnrollmentsScopeResolver))
+        self.assertFalse(result['features']['digests'])
+
+        # course that has not opened
+        result = resolver.resolve(self.not_open_course.id, None)
+
+        self.assertIsNotNone(result)
+        self.assertEqual(result['namespace'], self.not_open_course.id)
+        self.assertEqual(result['display_name'], self.not_open_course.display_name)
+        self.assertTrue(isinstance(result['default_user_resolver'], NamespaceEnrollmentsScopeResolver))
+        self.assertFalse(result['features']['digests'])

lms/startup.py

@@ -20,6 +20,7 @@ from openedx.core.djangoapps.course_groups.scope_resolver import CourseGroupScop
 from student.scope_resolver import CourseEnrollmentsScopeResolver, StudentEmailScopeResolver
 from projects.scope_resolver import GroupProjectParticipantsScopeResolver
 from edx_notifications.scopes import register_user_scope_resolver
+from util.namespace_resolver import CourseNamespaceResolver
 
 log = logging.getLogger(__name__)
 
@@ -215,13 +216,16 @@ def startup_notification_subsystem():
     try:
         startup.initialize()
 
-        # register the two scope resolvers that the LMS will be providing
+        # register the scope resolvers that the runtime will be providing
         # to edx-notifications
         register_user_scope_resolver('course_enrollments', CourseEnrollmentsScopeResolver())
         register_user_scope_resolver('course_group', CourseGroupScopeResolver())
         register_user_scope_resolver('group_project_participants', GroupProjectParticipantsScopeResolver())
         register_user_scope_resolver('group_project_workgroup', GroupProjectParticipantsScopeResolver())
         register_user_scope_resolver('student_email_resolver', StudentEmailScopeResolver())
+
+        # register namespace resolver
+        register_namespace_resolver(CourseNamespaceResolver())
     except Exception, ex:
         # Note this will fail when we try to run migrations as manage.py will call startup.py
         # and startup.initialze() will try to manipulate some database tables.