Add progress to class creation, fix interest emails

If there's 20 people interested in a course, class creation could take
quite a while so show progress. Only send emails to active members.
Change "Interest +" wording to "interested" in emails.

apiserver/apiserver/api/emails/interest.html

@@ -12,7 +12,7 @@
 		<div>You can find the class on its course page here:<br></div>
 		<div><a href="[link]">[link]</a><br></div>
 		<div><br></div>
-		<div>Your "interest" in this course is now removed and you won't receive any more notifications about its classes until you press the "Interest +" button again.<br></div>
+		<div>Your "interest" in this course is now removed and you won't receive any more notifications about its classes until you press the "interested" button again.<br></div>
 		<div><br></div>
 		<div>Spaceport<br></div>
 	</body>

apiserver/apiserver/api/emails/interest.txt

@@ -6,6 +6,6 @@ You can find the class on its course page here:
 [link]
 
 Your "interest" in this course is now removed and you won't receive any more
-notifications about its classes until you press the "Interest +" button again.
+notifications about its classes until you press the "interested" button again.
 
 Spaceport

apiserver/apiserver/api/utils_email.py

@@ -3,6 +3,7 @@ logger = logging.getLogger(__name__)
 
 import os
 import smtplib
+import time
 from datetime import datetime, timedelta
 
 from django.core.mail import send_mail, EmailMultiAlternatives
@@ -92,4 +93,7 @@ def send_interest_email(interest):
         html_message=email_html,
     )
 
+    if not settings.EMAIL_HOST:
+        time.sleep(0.5)  # simulate slowly sending emails when logging to console
+
     logger.info('Sent interest email:\n' + email_text)

apiserver/apiserver/api/utils_stats.py

@@ -195,8 +195,13 @@ def calc_card_scans():
 def get_progress(request_id):
     return cache.get('request-progress-' + request_id, [])
 
-def set_progress(request_id, data):
+def set_progress(request_id, data, replace=False):
     logger.info('Progress - ID: %s | Status: %s', request_id, data)
     progress = get_progress(request_id)
-    progress.append(data)
+
+    if replace and len(progress):
+        progress[-1] = data
+    else:
+        progress.append(data)
+
     cache.set('request-progress-' + request_id, progress)

apiserver/apiserver/api/views.py

@@ -279,6 +279,7 @@ class SessionViewSet(Base, List, Retrieve, Create, Update):
             return serializers.SessionSerializer
 
     def perform_create(self, serializer):
+        data = self.request.data
         session = serializer.save(instructor=self.request.user)
 
         # ensure session datetime is at least 1 day in the future
@@ -287,15 +288,22 @@ class SessionViewSet(Base, List, Retrieve, Create, Update):
             logging.info('Session is in the past or too soon, not sending interest emails.')
             return
 
-        interests = models.Interest.objects.filter(course=session.course, satisfied_by__isnull=True)
+        interests = models.Interest.objects.filter(
+            course=session.course,
+            satisfied_by__isnull=True,
+            user__member__paused_date__isnull=True
+        )
+
+        for num, interest in enumerate(interests):
+            msg = 'Sending email {} / {}...'.format(num+1, len(interests))
+            if data['request_id']: utils_stats.set_progress(data['request_id'], msg, replace=True)
 
-        for interest in interests:
             try:
                 utils_email.send_interest_email(interest)
             except BaseException as e:
                 msg = 'Problem sending interest email: ' + str(e)
                 logger.exception(msg)
-                alert_tanner(msg)
+                utils.alert_tanner(msg)
 
         num_satisfied = interests.update(satisfied_by=session)
         logging.info('Satisfied %s interests.', num_satisfied)