ECOM-5281 Adding retries and celery task for sending activation email.

cms/envs/common.py

@@ -1208,3 +1208,7 @@ COMPREHENSIVE_THEME_LOCALE_PATHS = []
 # to generating test databases will discover and try to create all tables
 # and this setting needs to be present
 OAUTH2_PROVIDER_APPLICATION_MODEL = 'oauth2_provider.Application'
+
+# Used with Email sending
+RETRY_ACTIVATION_EMAIL_MAX_ATTEMPTS = 5
+RETRY_ACTIVATION_EMAIL_TIMEOUT = 0.5

common/djangoapps/student/tasks.py

+"""
+This file contains celery tasks for sending email
+"""
+import logging
+from django.conf import settings
+from django.core import mail
+
+from celery.task import task  # pylint: disable=no-name-in-module, import-error
+from celery.exceptions import MaxRetriesExceededError
+from boto.exception import NoAuthHandlerFound
+
+log = logging.getLogger('edx.celery.task')
+
+
+@task(bind=True)
+def send_activation_email(self, subject, message, from_address, dest_addr):
+    """
+    Sending an activation email to the users.
+    """
+    max_retries = settings.RETRY_ACTIVATION_EMAIL_MAX_ATTEMPTS
+    retries = self.request.retries
+    try:
+        mail.send_mail(subject, message, from_address, [dest_addr], fail_silently=False)
+        # Log that the Activation Email has been sent to user without an exception
+        log.info("Activation Email has been sent to User {user_email}".format(
+            user_email=dest_addr
+        ))
+    except NoAuthHandlerFound:  # pylint: disable=broad-except
+        log.info('Retrying sending email to user {dest_addr}, attempt # {attempt} of {max_attempts}'. format(
+            dest_addr=dest_addr,
+            attempt=retries,
+            max_attempts=max_retries
+        ))
+        try:
+            self.retry(countdown=settings.RETRY_ACTIVATION_EMAIL_TIMEOUT, max_retries=max_retries)
+        except MaxRetriesExceededError:
+            log.error(
+                'Unable to send activation email to user from "%s" to "%s"',
+                from_address,
+                dest_addr,
+                exc_info=True
+            )
+    except Exception:  # pylint: disable=bare-except
+        log.exception(
+            'Unable to send activation email to user from "%s" to "%s"',
+            from_address,
+            dest_addr,
+            exc_info=True
+        )
+        raise Exception

common/djangoapps/student/tests/test_create_account.py

@@ -233,7 +233,7 @@ class TestCreateAccount(TestCase):
         request.user = AnonymousUser()
 
         with mock.patch('edxmako.request_context.get_current_request', return_value=request):
-            with mock.patch('django.contrib.auth.models.User.email_user') as mock_send_mail:
+            with mock.patch('django.core.mail.send_mail') as mock_send_mail:
                 student.views.create_account(request)
 
         # check that send_mail is called

common/djangoapps/student/tests/test_tasks.py

+"""
+Tests for the Sending activation email celery tasks
+"""
+
+import mock
+
+from django.test import TestCase
+from django.conf import settings
+from student.tasks import send_activation_email
+from boto.exception import NoAuthHandlerFound
+
+from lms.djangoapps.courseware.tests.factories import UserFactory
+
+
+class SendActivationEmailTestCase(TestCase):
+    """
+    Test for send activation email to user
+    """
+    def setUp(self):
+        """ Setup components used by each test."""
+        super(SendActivationEmailTestCase, self).setUp()
+        self.student = UserFactory()
+
+    @mock.patch('time.sleep', mock.Mock(return_value=None))
+    @mock.patch('student.tasks.log')
+    @mock.patch('django.core.mail.send_mail', mock.Mock(side_effect=NoAuthHandlerFound))
+    def test_send_email(self, mock_log):
+        """
+        Tests retries when the activation email doesn't send
+        """
+        from_address = 'task_testing@example.com'
+        email_max_attempts = settings.RETRY_ACTIVATION_EMAIL_MAX_ATTEMPTS
+
+        # pylint: disable=no-member
+        send_activation_email.delay('Task_test', 'Task_test_message', from_address, self.student.email)
+
+        # Asserts sending email retry logging.
+        for attempt in range(email_max_attempts):
+            mock_log.info.assert_any_call(
+                'Retrying sending email to user {dest_addr}, attempt # {attempt} of {max_attempts}'.format(
+                    dest_addr=self.student.email,
+                    attempt=attempt,
+                    max_attempts=email_max_attempts
+                ))
+        self.assertEquals(mock_log.info.call_count, 6)
+
+        # Asserts that the error was logged on crossing max retry attempts.
+        mock_log.error.assert_called_with(
+            'Unable to send activation email to user from "%s" to "%s"',
+            from_address,
+            self.student.email,
+            exc_info=True
+        )
+        self.assertEquals(mock_log.error.call_count, 1)

common/djangoapps/student/views.py

@@ -56,6 +56,7 @@ from student.models import (
     DashboardConfiguration, LinkedInAddToProfileConfiguration, ManualEnrollmentAudit, ALLOWEDTOENROLL_TO_ENROLLED,
     LogoutViewConfiguration, RegistrationCookieConfiguration)
 from student.forms import AccountCreationForm, PasswordResetFormNoActive, get_registration_extension_form
+from student.tasks import send_activation_email
 from lms.djangoapps.commerce.utils import EcommerceService  # pylint: disable=import-error
 from lms.djangoapps.verify_student.models import SoftwareSecurePhotoVerification  # pylint: disable=import-error
 from bulk_email.models import Optout, BulkEmailFlag  # pylint: disable=import-error
@@ -1812,21 +1813,11 @@ def create_account_with_params(request, params):
             'email_from_address',
             settings.DEFAULT_FROM_EMAIL
         )
-        try:
-            if settings.FEATURES.get('REROUTE_ACTIVATION_EMAIL'):
-                dest_addr = settings.FEATURES['REROUTE_ACTIVATION_EMAIL']
-                message = ("Activation for %s (%s): %s\n" % (user, user.email, profile.name) +
-                           '-' * 80 + '\n\n' + message)
-                mail.send_mail(subject, message, from_address, [dest_addr], fail_silently=False)
-            else:
-                user.email_user(subject, message, from_address)
-        except Exception:  # pylint: disable=broad-except
-            log.error(
-                u'Unable to send activation email to user from "%s" to "%s"',
-                from_address,
-                dest_addr,
-                exc_info=True
-            )
+        if settings.FEATURES.get('REROUTE_ACTIVATION_EMAIL'):
+            dest_addr = settings.FEATURES['REROUTE_ACTIVATION_EMAIL']
+            message = ("Activation for %s (%s): %s\n" % (user, user.email, profile.name) +
+                       '-' * 80 + '\n\n' + message)
+        send_activation_email.delay(subject, message, from_address, dest_addr)
     else:
         registration.activate()
         _enroll_user_in_pending_courses(user)  # Enroll student in any pending courses

lms/envs/common.py

@@ -375,6 +375,9 @@ GENERATE_PROFILE_SCORES = False
 # Used with XQueue
 XQUEUE_WAITTIME_BETWEEN_REQUESTS = 5  # seconds
 
+# Used with Email sending
+RETRY_ACTIVATION_EMAIL_MAX_ATTEMPTS = 5
+RETRY_ACTIVATION_EMAIL_TIMEOUT = 0.5
 
 ############################# SET PATH INFORMATION #############################
 PROJECT_ROOT = path(__file__).abspath().dirname().dirname()  # /edx-platform/lms