emit enrollment event

common/djangoapps/student/models.py

@@ -29,6 +29,12 @@ from django.forms import ModelForm, forms
 from course_modes.models import CourseMode
 import comment_client as cc
 from pytz import UTC
+import crum
+
+from track import contexts
+from track.views import server_track
+from eventtracking import tracker
+
 
 unenroll_done = django.dispatch.Signal(providing_args=["course_enrollment"])
 
@@ -667,6 +673,11 @@ class PendingEmailChange(models.Model):
     activation_key = models.CharField(('activation key'), max_length=32, unique=True, db_index=True)
 
 
+
+EVENT_NAME_ENROLLMENT_ACTIVATED = 'edx.course.enrollment.activated'
+EVENT_NAME_ENROLLMENT_DEACTIVATED = 'edx.course.enrollment.deactivated'
+
+
 class CourseEnrollment(models.Model):
     """
     Represents a Student's Enrollment record for a single Course. You should
@@ -737,19 +748,55 @@ class CourseEnrollment(models.Model):
         if user.id is None:
             user.save()
 
-        enrollment, _ = CourseEnrollment.objects.get_or_create(
+        enrollment, created = CourseEnrollment.objects.get_or_create(
             user=user,
             course_id=course_id,
         )
-        # In case we're reactivating a deactivated enrollment, or changing the
-        # enrollment mode.
-        if enrollment.mode != mode or enrollment.is_active != is_active:
-            enrollment.mode = mode
+
+        activation_changed = False
+        if enrollment.is_active != is_active:
             enrollment.is_active = is_active
+            activation_changed = True
+
+        mode_changed = False
+        if enrollment.mode != mode:
+            enrollment.mode = mode
+            mode_changed = True
+
+        if activation_changed or mode_changed:
             enrollment.save()
 
+        if created:
+            if is_active:
+                enrollment.emit_event(EVENT_NAME_ENROLLMENT_ACTIVATED)
+        else:
+            if activation_changed:
+                if is_active:
+                    enrollment.emit_event(EVENT_NAME_ENROLLMENT_ACTIVATED)
+                else:
+                    enrollment.emit_event(EVENT_NAME_ENROLLMENT_DEACTIVATED)
+
         return enrollment
 
+    def emit_event(self, event_name):
+        """
+        Emits an event to explicitly track course enrollment and unenrollment.
+        """
+
+        try:
+            context = contexts.course_context_from_course_id(self.course_id)
+            data = {
+                'user_id': self.user.id,
+                'course_id': self.course_id,
+                'mode': self.mode,
+            }
+
+            with tracker.get_tracker().context(event_name, context):
+                server_track(crum.get_current_request(), event_name, data)
+        except:  # pylint: disable=bare-except
+            if event_name and self.course_id:
+                log.exception('Unable to emit event %s for user %s and course %s', event_name, self.user.username, self.course_id)
+
     @classmethod
     def enroll(cls, user, course_id, mode="honor"):
         """
@@ -825,9 +872,13 @@ class CourseEnrollment(models.Model):
         """
         try:
             record = CourseEnrollment.objects.get(user=user, course_id=course_id)
-            record.is_active = False
-            record.save()
-            unenroll_done.send(sender=cls, course_enrollment=record)
+            if record.is_active:
+                record.is_active = False
+                record.save()
+
+                record.emit_event(EVENT_NAME_ENROLLMENT_DEACTIVATED)
+                unenroll_done.send(sender=cls, course_enrollment=record)
+
         except cls.DoesNotExist:
             err_msg = u"Tried to unenroll student {} from {} but they were not enrolled"
             log.error(err_msg.format(user, course_id))
@@ -918,6 +969,7 @@ class CourseEnrollment(models.Model):
         if not self.is_active:
             self.is_active = True
             self.save()
+            self.emit_event(EVENT_NAME_ENROLLMENT_ACTIVATED)
 
     def deactivate(self):
         """Makes this `CourseEnrollment` record inactive. Saves immediately. An
@@ -926,6 +978,7 @@ class CourseEnrollment(models.Model):
         if self.is_active:
             self.is_active = False
             self.save()
+            self.emit_event(EVENT_NAME_ENROLLMENT_DEACTIVATED)
 
     def refundable(self):
         """

common/djangoapps/student/tests/tests.py

@@ -25,7 +25,7 @@ from xmodule.modulestore.tests.factories import CourseFactory
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from courseware.tests.tests import TEST_DATA_MIXED_MODULESTORE
 
-from mock import Mock, patch
+from mock import Mock, patch, sentinel
 from textwrap import dedent
 
 from student.models import unique_id_for_user, CourseEnrollment
@@ -276,6 +276,16 @@ class DashboardTest(TestCase):
 class EnrollInCourseTest(TestCase):
     """Tests enrolling and unenrolling in courses."""
 
+    def setUp(self):
+        patcher = patch('student.models.server_track')
+        self.mock_server_track = patcher.start()
+        self.addCleanup(patcher.stop)
+
+        crum_patcher = patch('student.models.crum.get_current_request')
+        self.mock_get_current_request = crum_patcher.start()
+        self.addCleanup(crum_patcher.stop)
+        self.mock_get_current_request.return_value = sentinel.request
+
     def test_enrollment(self):
         user = User.objects.create_user("joe", "joe@joe.com", "password")
         course_id = "edX/Test101/2013"
@@ -289,24 +299,28 @@ class EnrollInCourseTest(TestCase):
         self.assertTrue(CourseEnrollment.is_enrolled(user, course_id))
         self.assertTrue(CourseEnrollment.is_enrolled_by_partial(user,
             course_id_partial))
+        self.assert_enrollment_event_was_emitted(user, course_id)
 
         # Enrolling them again should be harmless
         CourseEnrollment.enroll(user, course_id)
         self.assertTrue(CourseEnrollment.is_enrolled(user, course_id))
         self.assertTrue(CourseEnrollment.is_enrolled_by_partial(user,
             course_id_partial))
+        self.assert_no_events_were_emitted()
 
         # Now unenroll the user
         CourseEnrollment.unenroll(user, course_id)
         self.assertFalse(CourseEnrollment.is_enrolled(user, course_id))
         self.assertFalse(CourseEnrollment.is_enrolled_by_partial(user,
             course_id_partial))
+        self.assert_unenrollment_event_was_emitted(user, course_id)
 
         # Unenrolling them again should also be harmless
         CourseEnrollment.unenroll(user, course_id)
         self.assertFalse(CourseEnrollment.is_enrolled(user, course_id))
         self.assertFalse(CourseEnrollment.is_enrolled_by_partial(user,
             course_id_partial))
+        self.assert_no_events_were_emitted()
 
         # The enrollment record should still exist, just be inactive
         enrollment_record = CourseEnrollment.objects.get(
@@ -315,6 +329,37 @@ class EnrollInCourseTest(TestCase):
         )
         self.assertFalse(enrollment_record.is_active)
 
+    def assert_no_events_were_emitted(self):
+        """Ensures no events were emitted since the last event related assertion"""
+        self.assertFalse(self.mock_server_track.called)
+        self.mock_server_track.reset_mock()
+
+    def assert_enrollment_event_was_emitted(self, user, course_id):
+        """Ensures an enrollment event was emitted since the last event related assertion"""
+        self.mock_server_track.assert_called_once_with(
+            sentinel.request,
+            'edx.course.enrollment.activated',
+            {
+                'course_id': course_id,
+                'user_id': user.pk,
+                'mode': 'honor'
+            }
+        )
+        self.mock_server_track.reset_mock()
+
+    def assert_unenrollment_event_was_emitted(self, user, course_id):
+        """Ensures an unenrollment event was emitted since the last event related assertion"""
+        self.mock_server_track.assert_called_once_with(
+            sentinel.request,
+            'edx.course.enrollment.deactivated',
+            {
+                'course_id': course_id,
+                'user_id': user.pk,
+                'mode': 'honor'
+            }
+        )
+        self.mock_server_track.reset_mock()
+
     def test_enrollment_non_existent_user(self):
         # Testing enrollment of newly unsaved user (i.e. no database entry)
         user = User(username="rusty", email="rusty@fake.edx.org")
@@ -324,11 +369,13 @@ class EnrollInCourseTest(TestCase):
 
         # Unenroll does nothing
         CourseEnrollment.unenroll(user, course_id)
+        self.assert_no_events_were_emitted()
 
         # Implicit save() happens on new User object when enrolling, so this
         # should still work
         CourseEnrollment.enroll(user, course_id)
         self.assertTrue(CourseEnrollment.is_enrolled(user, course_id))
+        self.assert_enrollment_event_was_emitted(user, course_id)
 
     def test_enrollment_by_email(self):
         user = User.objects.create(username="jack", email="jack@fake.edx.org")
@@ -336,11 +383,13 @@ class EnrollInCourseTest(TestCase):
 
         CourseEnrollment.enroll_by_email("jack@fake.edx.org", course_id)
         self.assertTrue(CourseEnrollment.is_enrolled(user, course_id))
+        self.assert_enrollment_event_was_emitted(user, course_id)
 
         # This won't throw an exception, even though the user is not found
         self.assertIsNone(
             CourseEnrollment.enroll_by_email("not_jack@fake.edx.org", course_id)
         )
+        self.assert_no_events_were_emitted()
 
         self.assertRaises(
             User.DoesNotExist,
@@ -349,17 +398,21 @@ class EnrollInCourseTest(TestCase):
             course_id,
             ignore_errors=False
         )
+        self.assert_no_events_were_emitted()
 
         # Now unenroll them by email
         CourseEnrollment.unenroll_by_email("jack@fake.edx.org", course_id)
         self.assertFalse(CourseEnrollment.is_enrolled(user, course_id))
+        self.assert_unenrollment_event_was_emitted(user, course_id)
 
         # Harmless second unenroll
         CourseEnrollment.unenroll_by_email("jack@fake.edx.org", course_id)
         self.assertFalse(CourseEnrollment.is_enrolled(user, course_id))
+        self.assert_no_events_were_emitted()
 
         # Unenroll on non-existent user shouldn't throw an error
         CourseEnrollment.unenroll_by_email("not_jack@fake.edx.org", course_id)
+        self.assert_no_events_were_emitted()
 
     def test_enrollment_multiple_classes(self):
         user = User(username="rusty", email="rusty@fake.edx.org")
@@ -367,15 +420,19 @@ class EnrollInCourseTest(TestCase):
         course_id2 = "MITx/6.003z/2012"
 
         CourseEnrollment.enroll(user, course_id1)
+        self.assert_enrollment_event_was_emitted(user, course_id1)
         CourseEnrollment.enroll(user, course_id2)
+        self.assert_enrollment_event_was_emitted(user, course_id2)
         self.assertTrue(CourseEnrollment.is_enrolled(user, course_id1))
         self.assertTrue(CourseEnrollment.is_enrolled(user, course_id2))
 
         CourseEnrollment.unenroll(user, course_id1)
+        self.assert_unenrollment_event_was_emitted(user, course_id1)
         self.assertFalse(CourseEnrollment.is_enrolled(user, course_id1))
         self.assertTrue(CourseEnrollment.is_enrolled(user, course_id2))
 
         CourseEnrollment.unenroll(user, course_id2)
+        self.assert_unenrollment_event_was_emitted(user, course_id2)
         self.assertFalse(CourseEnrollment.is_enrolled(user, course_id1))
         self.assertFalse(CourseEnrollment.is_enrolled(user, course_id2))
 
@@ -388,27 +445,33 @@ class EnrollInCourseTest(TestCase):
         # (calling CourseEnrollment.enroll() would have)
         enrollment = CourseEnrollment.create_enrollment(user, course_id)
         self.assertFalse(CourseEnrollment.is_enrolled(user, course_id))
+        self.assert_no_events_were_emitted()
 
         # Until you explicitly activate it
         enrollment.activate()
         self.assertTrue(CourseEnrollment.is_enrolled(user, course_id))
+        self.assert_enrollment_event_was_emitted(user, course_id)
 
         # Activating something that's already active does nothing
         enrollment.activate()
         self.assertTrue(CourseEnrollment.is_enrolled(user, course_id))
+        self.assert_no_events_were_emitted()
 
         # Now deactive
         enrollment.deactivate()
         self.assertFalse(CourseEnrollment.is_enrolled(user, course_id))
+        self.assert_unenrollment_event_was_emitted(user, course_id)
 
         # Deactivating something that's already inactive does nothing
         enrollment.deactivate()
         self.assertFalse(CourseEnrollment.is_enrolled(user, course_id))
+        self.assert_no_events_were_emitted()
 
         # A deactivated enrollment should be activated if enroll() is called
         # for that user/course_id combination
         CourseEnrollment.enroll(user, course_id)
         self.assertTrue(CourseEnrollment.is_enrolled(user, course_id))
+        self.assert_enrollment_event_was_emitted(user, course_id)
 
 
 @override_settings(MODULESTORE=TEST_DATA_MIXED_MODULESTORE)

common/djangoapps/track/contexts.py

 """Generates common contexts"""
 
 import re
+import logging
 
+from xmodule.course_module import CourseDescriptor
 
-COURSE_REGEX = re.compile(r'^.*?/courses/(?P<course_id>(?P<org_id>[^/]+)/[^/]+/[^/]+)')
+
+COURSE_REGEX = re.compile(r'^.*?/courses/(?P<course_id>[^/]+/[^/]+/[^/]+)')
+log = logging.getLogger(__name__)
 
 
 def course_context_from_url(url):
     """
-    Extracts the course_id from the given `url.`
+    Extracts the course_id from the given `url` and passes it on to
+    `course_context_from_course_id()`.
+    """
+    url = url or ''
+
+    match = COURSE_REGEX.match(url)
+    course_id = ''
+    if match:
+        course_id = match.group('course_id') or ''
+
+    return course_context_from_course_id(course_id)
+
+
+def course_context_from_course_id(course_id):
+    """
+    Creates a course context from a `course_id`.
 
     Example Returned Context::
 
@@ -18,14 +37,21 @@ def course_context_from_url(url):
         }
 
     """
-    url = url or ''
 
+    course_id = course_id or ''
     context = {
-        'course_id': '',
+        'course_id': course_id,
         'org_id': ''
     }
-    match = COURSE_REGEX.match(url)
-    if match:
-        context.update(match.groupdict())
+    try:
+        location = CourseDescriptor.id_to_location(course_id)
+        context['org_id'] = location.org
+    except ValueError:
+        log.warning(
+            'Unable to parse course_id "{course_id}"'.format(
+                course_id=course_id
+            ),
+            exc_info=True
+        )
 
     return context

lms/djangoapps/courseware/features/certificates.feature

@@ -8,6 +8,7 @@ Feature: LMS.Verified certificates
         Given I am logged in
         When I select the audit track
         Then I should see the course on my dashboard
+        And a "edx.course.enrollment.activated" server event is emitted
 
     Scenario: I can submit photos to verify my identity
         Given I am logged in
@@ -36,6 +37,7 @@ Feature: LMS.Verified certificates
         Then I see the course on my dashboard
         And I see that I am on the verified track
         And I do not see the upsell link on my dashboard
+        And a "edx.course.enrollment.activated" server event is emitted
 
     # Not easily automated
 #    Scenario: I can re-take photos
@@ -71,6 +73,7 @@ Feature: LMS.Verified certificates
         And the course has an honor mode
         When I give a reason why I cannot pay
         Then I should see the course on my dashboard
+        And a "edx.course.enrollment.activated" server event is emitted
 
     Scenario: The upsell offer is on the dashboard if I am auditing.
         Given I am logged in
@@ -91,4 +94,5 @@ Feature: LMS.Verified certificates
         And I navigate to my dashboard
         Then I see the course on my dashboard
         And I see that I am on the verified track
+        And a "edx.course.enrollment.activated" server event is emitted
 

lms/djangoapps/courseware/features/registration.feature

@@ -10,6 +10,7 @@ Feature: LMS.Register for a course
     And I visit the courses page
     When I register for the course "6.002x"
     Then I should see the course numbered "6.002x" in my dashboard
+    And a "edx.course.enrollment.activated" server event is emitted
 
   Scenario: I can unregister for a course
     Given I am registered for the course "6.002x"
@@ -19,3 +20,4 @@ Feature: LMS.Register for a course
     Then I should be on the dashboard page
     And I should see an empty dashboard message
     And I should NOT see the course numbered "6.002x" in my dashboard
+    And a "edx.course.enrollment.deactivated" server event is emitted