feat: send enrollment/fulfillment failure email on unsupported course mode

commerce_coordinator/apps/commercetools/serializers.py

@@ -87,6 +87,9 @@ class OrderFulfillViewInputSerializer(CoordinatorSerializer):
     line_item_state_id = serializers.CharField(allow_null=False)
     edx_lms_user_id = serializers.IntegerField(allow_null=False)
     message_id = serializers.CharField(allow_null=False)
+    course_title = serializers.CharField(allow_null=False)
+    user_first_name = serializers.CharField(allow_null=False)
+    user_email = serializers.EmailField(allow_null=False)
 
 
 class OrderReturnedViewMessageLineItemReturnItemSerializer(CoordinatorSerializer):

commerce_coordinator/apps/commercetools/sub_messages/tasks.py

@@ -125,7 +125,10 @@ def fulfill_order_placed_message_signal_task(
             'course_mode': get_course_mode_from_ct_order(item),
             'item_quantity': item.quantity,
             'line_item_state_id': line_item_state_id,
-            'message_id': message_id
+            'message_id': message_id,
+            'user_first_name': customer.first_name,
+            'user_email': customer.email,
+            'course_title': item.name.get('en-US', '')
         })
 
         # the following throws and thus doesn't need to be a conditional

commerce_coordinator/apps/commercetools/tests/conftest.py

@@ -284,6 +284,7 @@ def gen_example_customer() -> CTCustomer:
 
 def gen_customer(email: str, un: str):
     return CTCustomer(
+        first_name='John',
         email=email,
         custom=CTCustomFields(
             type=CTTypeReference(

commerce_coordinator/apps/commercetools/tests/test_utils.py

@@ -28,6 +28,7 @@
     has_full_refund_transaction,
     has_refund_transaction,
     send_order_confirmation_email,
+    send_unsupported_mode_fulfillment_error_email,
     translate_stripe_refund_status_to_transaction_status
 )
 
@@ -126,6 +127,60 @@ def test_send_order_confirmation_email_failure(self, mock_logger, mock_get_braze
             mock_logger.assert_called_once_with('Encountered exception sending Order confirmation email. '
                                                 'Exception: Error sending Braze email')
 
+    @override_settings(
+        BRAZE_API_KEY="braze_api_key",
+        BRAZE_API_SERVER="braze_api_server",
+        BRAZE_CT_FULFILLMENT_UNSUPPORTED_MODE_ERROR_CANVAS_ID="dummy_canvas"
+    )
+    @patch('commerce_coordinator.apps.commercetools.utils.get_braze_client')
+    def test_send_unsupported_mode_fulfillment_error_email_success(self, mock_get_braze_client):
+        mock_braze_client = Mock()
+        mock_get_braze_client.return_value = mock_braze_client
+
+        canvas_entry_properties = {}
+        lms_user_id = 'user123'
+        lms_user_email = '[email protected]'
+
+        with patch.object(mock_braze_client, 'send_canvas_message') as mock_send_canvas_message:
+            send_unsupported_mode_fulfillment_error_email(
+                lms_user_id, lms_user_email, canvas_entry_properties
+            )
+
+            mock_send_canvas_message.assert_called_once_with(
+                canvas_id='dummy_canvas',
+                recipients=[{"external_user_id": lms_user_id, "attributes": {"email": lms_user_email}}],
+                canvas_entry_properties=canvas_entry_properties,
+            )
+
+    @override_settings(
+        BRAZE_API_KEY="braze_api_key",
+        BRAZE_API_SERVER="braze_api_server",
+        BRAZE_CT_FULFILLMENT_UNSUPPORTED_MODE_ERROR_CANVAS_ID="dummy_canvas"
+    )
+    @patch('commerce_coordinator.apps.commercetools.utils.get_braze_client')
+    @patch('commerce_coordinator.apps.commercetools.utils.logger.exception')
+    def test_send_unsupported_mode_fulfillment_error_email_failure(self, mock_logger, mock_get_braze_client):
+        mock_braze_client = Mock()
+        mock_get_braze_client.return_value = mock_braze_client
+
+        canvas_entry_properties = {}
+        lms_user_id = 'user123'
+        lms_user_email = '[email protected]'
+
+        with patch.object(mock_braze_client, 'send_canvas_message') as mock_send_canvas_message:
+            mock_send_canvas_message.side_effect = Exception('Error sending Braze email')
+            send_unsupported_mode_fulfillment_error_email(
+                lms_user_id, lms_user_email, canvas_entry_properties
+            )
+
+            mock_send_canvas_message.assert_called_once_with(
+                canvas_id='dummy_canvas',
+                recipients=[{"external_user_id": lms_user_id, "attributes": {"email": lms_user_email}}],
+                canvas_entry_properties=canvas_entry_properties,
+            )
+            mock_logger.assert_called_once_with('Encountered exception sending Fulfillment unsupported mode error '
+                                                'email. Exception: Error sending Braze email')
+
     def test_extract_ct_product_information_for_braze_canvas(self):
         order = gen_order(EXAMPLE_FULFILLMENT_SIGNAL_PAYLOAD['order_number'])
         line_item = order.line_items[0]

commerce_coordinator/apps/commercetools/utils.py

@@ -65,6 +65,27 @@ def send_order_confirmation_email(
         logger.exception(f"Encountered exception sending Order confirmation email. Exception: {exc}")
 
 
+def send_unsupported_mode_fulfillment_error_email(
+    lms_user_id, lms_user_email, canvas_entry_properties
+):
+    """ Sends fulfillment error email via Braze. """
+    recipients = [{"external_user_id": lms_user_id, "attributes": {
+        "email": lms_user_email,
+    }}]
+    canvas_id = settings.BRAZE_CT_FULFILLMENT_UNSUPPORTED_MODE_ERROR_CANVAS_ID
+
+    try:
+        braze_client = get_braze_client()
+        if braze_client:
+            braze_client.send_canvas_message(
+                canvas_id=canvas_id,
+                recipients=recipients,
+                canvas_entry_properties=canvas_entry_properties,
+            )
+    except Exception as exc:  # pylint: disable=broad-exception-caught
+        logger.exception(f"Encountered exception sending Fulfillment unsupported mode error email. Exception: {exc}")
+
+
 def format_amount_for_braze_canvas(centAmount):
     """
     Utility to convert amount to dollar with 2 decimals percision. Also adds the Dollar signs to resulting value.

commerce_coordinator/apps/lms/signal_handlers.py

@@ -28,6 +28,9 @@ def fulfill_order_placed_send_enroll_in_course(**kwargs):
         line_item_id=kwargs['line_item_id'],
         item_quantity=kwargs['item_quantity'],
         line_item_state_id=kwargs['line_item_state_id'],
-        message_id=kwargs['message_id']
+        message_id=kwargs['message_id'],
+        user_first_name=kwargs['user_first_name'],
+        user_email=kwargs['user_email'],
+        course_title=kwargs['course_title']
     )
     return async_result.id

commerce_coordinator/apps/lms/tasks.py

@@ -2,23 +2,76 @@
 LMS Celery tasks
 """
 
+import json
 from datetime import datetime
 
-from celery import shared_task
+from celery import Task, shared_task
 from celery.utils.log import get_task_logger
 from django.contrib.auth import get_user_model
 from requests import RequestException
 
 from commerce_coordinator.apps.commercetools.catalog_info.constants import TwoUKeys
 from commerce_coordinator.apps.commercetools.clients import CommercetoolsAPIClient
+from commerce_coordinator.apps.commercetools.utils import send_unsupported_mode_fulfillment_error_email
 from commerce_coordinator.apps.lms.clients import LMSAPIClient
 
 # Use the special Celery logger for our tasks
 logger = get_task_logger(__name__)
 User = get_user_model()
 
 
-@shared_task(bind=True, autoretry_for=(RequestException,), retry_kwargs={'max_retries': 5, 'countdown': 3})
+class CourseEnrollTaskAfterReturn(Task):    # pylint: disable=abstract-method
+    """
+    Base class for fulfill_order_placed_send_enroll_in_course_task
+    """
+
+    def on_failure(self, exc, task_id, args, kwargs, einfo):
+        edx_lms_user_id = kwargs.get('edx_lms_user_id')
+        user_email = kwargs.get('user_email')
+        order_number = kwargs.get('order_number')
+        user_first_name = kwargs.get('user_first_name')
+        course_title = kwargs.get('course_title')
+
+        error_message = (
+            json.loads(exc.response.text).get('message', '')
+            if isinstance(exc, RequestException) and exc.response is not None
+            else str(exc)
+        )
+
+        logger.error(
+            f"Post-purchase fulfillment task {self.name} failed after max "
+            f"retries with the error message: {error_message} "
+            f"for user with user Id: {edx_lms_user_id}, email: {user_email}, "
+            f"order number: {order_number}, and course title: {course_title}"
+        )
+
+        # This error is returned from LMS if the course mode is unsupported
+        # https://github.com/openedx/edx-platform/blob/master/openedx/core/djangoapps/enrollments/views.py#L870
+        course_mode_expired_error = "course mode is expired or otherwise unavailable for course run"
+
+        if course_mode_expired_error in error_message:
+            logger.info(
+                f"Sending unsupported course mode fulfillment error email "
+                f"for the user with user ID: {edx_lms_user_id}, email: {user_email}, "
+                f"order number: {order_number}, and course title: {course_title}"
+            )
+
+            canvas_entry_properties = {
+                'order_number': order_number,
+                'product_type': 'course',  # TODO: Fetch product type from commercetools product object
+                'product_name': course_title,
+                'first_name': user_first_name,
+            }
+            # Send failure notification email
+            send_unsupported_mode_fulfillment_error_email(edx_lms_user_id, user_email, canvas_entry_properties)
+
+
+@shared_task(
+    bind=True,
+    autoretry_for=(RequestException,),
+    retry_kwargs={'max_retries': 5, 'countdown': 3},
+    base=CourseEnrollTaskAfterReturn,
+)
 def fulfill_order_placed_send_enroll_in_course_task(
     self,
     course_id,
@@ -34,7 +87,10 @@ def fulfill_order_placed_send_enroll_in_course_task(
     line_item_id,
     item_quantity,
     line_item_state_id,
-    message_id
+    message_id,
+    user_first_name,    # pylint: disable=unused-argument
+    user_email,         # pylint: disable=unused-argument
+    course_title        # pylint: disable=unused-argument
 ):
     """
     Celery task for order placed fulfillment and enrollment via LMS Enrollment API.

commerce_coordinator/apps/lms/tests/constants.py

@@ -29,7 +29,10 @@
     'line_item_id': '822d77c4-00a6-4fb9-909b-094ef0b8c4b9',
     'item_quantity': 1,
     'line_item_state_id': '8f2e888e-9777-4557-9a7f-c649153770c2',
-    'message_id': '1063f19c-08f3-41a4-a952-a8577374373c'
+    'message_id': '1063f19c-08f3-41a4-a952-a8577374373c',
+    'user_first_name': 'test',
+    'user_email': '[email protected]',
+    'course_title': 'Demonstration Course',
 }
 
 EXAMPLE_FULFILLMENT_REQUEST_PAYLOAD = {

commerce_coordinator/apps/lms/tests/test_signals.py

@@ -35,7 +35,10 @@ class FulfillOrderPlacedSendEnrollInCourseTest(CoordinatorSignalReceiverTestCase
         'line_item_id': 11,
         'item_quantity': 1,
         'line_item_state_id': 12,
-        'message_id': 13
+        'message_id': 13,
+        'user_first_name': 14,
+        'user_email': 15,
+        'course_title': 16,
     }
 
     def test_correct_arguments_passed(self, mock_task):

commerce_coordinator/apps/lms/tests/test_tasks.py

@@ -3,7 +3,7 @@
 """
 
 import logging
-from unittest.mock import patch, sentinel
+from unittest.mock import Mock, patch, sentinel
 
 from django.test import TestCase
 from requests import RequestException
@@ -49,7 +49,10 @@ def unpack_for_uut(values):
             values['line_item_id'],
             values['item_quantity'],
             values['line_item_state_id'],
-            values['message_id']
+            values['message_id'],
+            values['user_first_name'],
+            values['user_email'],
+            values['course_title']
         )
 
     def setUp(self):
@@ -130,3 +133,42 @@ def test_retry_logic(self, mock_ct_get_order, mock_ct_get_state, mock_client):
 
         mock_ct_get_state.assert_called_with(TwoUKeys.FAILURE_FULFILMENT_STATE)
         mock_ct_get_order.assert_called_with(EXAMPLE_FULFILLMENT_SIGNAL_PAYLOAD.get('order_id'))
+
+    @patch('commerce_coordinator.apps.lms.tasks.send_unsupported_mode_fulfillment_error_email')
+    @patch.object(fulfill_order_placed_send_enroll_in_course_task, 'max_retries', 5)
+    def test_fulfillment_error_email_is_sent_on_failure(
+            self, mock_send_email, mock_client
+    ):    # pylint: disable=unused-argument
+        """
+        Test that `on_failure` sends the appropriate failure email.
+        """
+        mock_response = Mock()
+        mock_response.text = '{"message": "course mode is expired or otherwise unavailable for course run"}'
+        exception = RequestException("400 Bad Request")
+        exception.response = mock_response
+
+        exc = exception
+        task_id = "test_task_id"
+        args = []
+        kwargs = EXAMPLE_FULFILLMENT_SIGNAL_PAYLOAD
+        einfo = Mock()
+
+        fulfill_order_placed_send_enroll_in_course_task.push_request(retries=5)
+        fulfill_order_placed_send_enroll_in_course_task.on_failure(
+            exc=exc,
+            task_id=task_id,
+            args=args,
+            kwargs=kwargs,
+            einfo=einfo
+        )
+
+        mock_send_email.assert_called_once_with(
+            EXAMPLE_FULFILLMENT_SIGNAL_PAYLOAD['edx_lms_user_id'],
+            EXAMPLE_FULFILLMENT_SIGNAL_PAYLOAD['user_email'],
+            {
+                'order_number': EXAMPLE_FULFILLMENT_SIGNAL_PAYLOAD['order_number'],
+                'product_type': 'course',
+                'product_name': EXAMPLE_FULFILLMENT_SIGNAL_PAYLOAD['course_title'],
+                'first_name': EXAMPLE_FULFILLMENT_SIGNAL_PAYLOAD['user_first_name'],
+            }
+        )

commerce_coordinator/settings/base.py

@@ -468,6 +468,7 @@ def root(*path_fragments):
 BRAZE_API_KEY = None
 BRAZE_API_SERVER = None
 BRAZE_CT_ORDER_CONFIRMATION_CANVAS_ID = ''
+BRAZE_CT_FULFILLMENT_UNSUPPORTED_MODE_ERROR_CANVAS_ID = ''
 
 # SEGMENT WRITE KEY
 SEGMENT_KEY = None

commerce_coordinator/settings/local.py

@@ -7,6 +7,7 @@
     'host.docker.internal',
     'localhost',
     '.ngrok-free.app',
+    '.share.zrok.io',
 )
 
 INSTALLED_APPS += (

docs/conf.py

@@ -556,3 +556,10 @@ def setup(app):
     """Sphinx extension: run sphinx-apidoc."""
     event = 'builder-inited'
     app.connect(event, on_init)
+
+# celery.Task has some roles inside the library that are not recognized by Sphinx
+# and causing errors, so we add them here to avoid the errors.
+rst_prolog = """
+.. role:: setting
+.. role:: sig
+"""