Add NotificationSender, one test

atst/models/__init__.py

@@ -17,5 +17,6 @@ from .portfolio_invitation import PortfolioInvitation
 from .application_invitation import ApplicationInvitation
 from .task_order import TaskOrder
 from .dd_254 import DD254
+from .notification_recipient import NotificationRecipient
 
 from .mixins.invites import Status as InvitationStatus

atst/models/notification_recipient.py

@@ -0,0 +1,10 @@
+from sqlalchemy import String, Column
+
+from atst.models import Base, types, mixins
+
+
+class NotificationRecipient(Base, mixins.TimestampsMixin):
+    __tablename__ = "notification_recipients"
+
+    id = types.Id()
+    email = Column(String, nullable=False)

atst/utils/notification_sender.py

@@ -0,0 +1,20 @@
+from atst.queue import ATSTQueue
+from atst.database import db
+from atst.models import NotificationRecipient
+
+
+class NotificationSender(object):
+    EMAIL_SUBJECT = "ATST notification"
+
+    def __init__(self, queue: ATSTQueue):
+        self.queue = queue
+
+    def send(self, body, type_=None):
+        recipients = self._get_recipients(type_)
+        self.queue.send_mail(recipients, self.EMAIL_SUBJECT, body)
+
+    def _get_recipients(self, type_):
+        return [
+            recipient.email
+            for recipient in db.session.query(NotificationRecipient).all()
+        ]