feat(full-stack): disable notifications after 3 failures

This stops notifications from firing over and over again if they are repeatedly failing.

[TESTING -> locally with docker compose, DATABASE MIGRATION -> there is a single migration]

Issue: https://www.pivotaltracker.com/story/show/b144646649n

- [ ] It works!
- [ ] Comments provide sufficient explanations for the next contributor
- [ ] Tests cover changes and corner cases
- [ ] Follows Quay syntax patterns and format

data/model/notification.py

@@ -1,9 +1,9 @@
 import json
 
-from data.model import InvalidNotificationException, db_transaction
 from data.database import (Notification, NotificationKind, User, Team, TeamMember, TeamRole,
                            RepositoryNotification, ExternalNotificationEvent, Repository,
-                           ExternalNotificationMethod, Namespace)
+                           ExternalNotificationMethod, Namespace, db_for_update)
+from data.model import InvalidNotificationException, db_transaction
 
 
 def create_notification(kind_name, target, metadata={}, lookup_path=None):
@@ -125,6 +125,29 @@ def delete_matching_notifications(target, kind_name, **kwargs):
     notification.delete_instance()
 
 
+def increment_notification_failure_count(notification_id):
+  """ This increments the number of failures by one """
+  RepositoryNotification.update(number_of_failures=RepositoryNotification.number_of_failures + 1).where(
+    RepositoryNotification.id == notification_id).execute()
+
+
+def reset_notification_number_of_failures(namespace_name, repository_name, uuid):
+  """ This resets the number of failures for a repo notification to 0 """
+  try:
+    notification = RepositoryNotification.select().where(RepositoryNotification.uuid == uuid).get()
+    if (notification.repository.namespace_user.username != namespace_name or
+            notification.repository.name != repository_name):
+      raise InvalidNotificationException('No repository notification found with uuid: %s' % uuid)
+    reset_number_of_failures_to_zero(notification.id)
+  except RepositoryNotification.DoesNotExist:
+    pass
+
+
+def reset_number_of_failures_to_zero(notification_id):
+  """ This resets the number of failures for a repo notification to 0 """
+  RepositoryNotification.update(number_of_failures=0).where(RepositoryNotification.id == notification_id).execute()
+
+
 def create_repo_notification(repo, event_name, method_name, method_config, event_config, title=None):
   event = ExternalNotificationEvent.get(ExternalNotificationEvent.name == event_name)
   method = ExternalNotificationMethod.get(ExternalNotificationMethod.name == method_name)
@@ -134,23 +157,34 @@ def create_repo_notification(repo, event_name, method_name, method_config, event
                                        event_config_json=json.dumps(event_config))
 
 
+def _base_get_notification(uuid):
+  """ This is a base query for get statements """
+  return (RepositoryNotification
+          .select(RepositoryNotification, Repository, Namespace)
+          .join(Repository)
+          .join(Namespace, on=(Repository.namespace_user == Namespace.id))
+          .where(RepositoryNotification.uuid == uuid))
+
+
+def get_enabled_notification(uuid):
+  """ This returns a notification with less than 3 failures """
+  try:
+    return _base_get_notification(uuid).where(RepositoryNotification.number_of_failures < 3).get()
+  except RepositoryNotification.DoesNotExist:
+    raise InvalidNotificationException('No repository notification found with uuid: %s' % uuid)
+
+
 def get_repo_notification(uuid):
   try:
-    return (RepositoryNotification
-            .select(RepositoryNotification, Repository, Namespace)
-            .join(Repository)
-            .join(Namespace, on=(Repository.namespace_user == Namespace.id))
-            .where(RepositoryNotification.uuid == uuid)
-            .get())
+    return _base_get_notification(uuid).get()
   except RepositoryNotification.DoesNotExist:
-    raise InvalidNotificationException('No repository notification found with id: %s' % uuid)
+    raise InvalidNotificationException('No repository notification found with uuid: %s' % uuid)
 
 
 def delete_repo_notification(namespace_name, repository_name, uuid):
   found = get_repo_notification(uuid)
-  if (found.repository.namespace_user.username != namespace_name or
-      found.repository.name != repository_name):
-    raise InvalidNotificationException('No repository notifiation found with id: %s' % uuid)
+  if found.repository.namespace_user.username != namespace_name or found.repository.name != repository_name:
+    raise InvalidNotificationException('No repository notifiation found with uuid: %s' % uuid)
   found.delete_instance()
   return found