Handle request status event transitions

atst/domain/requests/requests.py

@@ -6,9 +6,11 @@ from atst.models.request_status_event import RequestStatusEvent, RequestStatus
 from atst.models.request_review import RequestReview
 from atst.models.request_internal_comment import RequestInternalComment
 from atst.utils import deep_merge
+from atst.queue import queue
 
 from .query import RequestsQuery
 from .authorization import RequestsAuthorization
+from .status_event_handler import RequestStatusEventHandler
 
 
 def create_revision_from_request_body(body):
@@ -95,11 +97,17 @@ class Requests(object):
 
     @classmethod
     def set_status(cls, request, status: RequestStatus):
+        old_status = request.status
         status_event = RequestStatusEvent(
             new_status=status, revision=request.latest_revision
         )
         request.status_events.append(status_event)
-        return RequestsQuery.add_and_commit(request)
+        updated_request = RequestsQuery.add_and_commit(request)
+        RequestStatusEventHandler(queue).handle_status_change(
+            updated_request, old_status, status
+        )
+
+        return updated_request
 
     @classmethod
     def should_auto_approve(cls, request):

atst/domain/requests/status_event_handler.py

@@ -0,0 +1,41 @@
+from flask import render_template
+
+from atst.models.request_status_event import RequestStatus
+
+
+class RequestStatusEventHandler(object):
+    def __init__(self, queue):
+        self.queue = queue
+
+    def handle_status_change(self, request, old_status, new_status):
+        handler = self._get_handler(old_status, new_status)
+        if handler:
+            handler(request)
+
+    def _get_handler(self, old_status, new_status):
+        return {
+            (
+                RequestStatus.PENDING_CCPO_ACCEPTANCE,
+                RequestStatus.PENDING_FINANCIAL_VERIFICATION,
+            ): self._send_email,
+            (
+                RequestStatus.PENDING_CCPO_ACCEPTANCE,
+                RequestStatus.CHANGES_REQUESTED,
+            ): self._send_email,
+            (
+                RequestStatus.PENDING_CCPO_APPROVAL,
+                RequestStatus.CHANGES_REQUESTED_TO_FINVER,
+            ): self._send_email,
+            (
+                RequestStatus.PENDING_CCPO_APPROVAL,
+                RequestStatus.APPROVED,
+            ): self._send_email,
+        }.get((old_status, new_status))
+
+    def _send_email(self, request):
+        email_body = render_template(
+            "emails/request_status_change.txt", request=request
+        )
+        self.queue.send_mail(
+            [request.creator.email], "Your JEDI request status has changed", email_body
+        )

atst/queue.py

@@ -27,8 +27,8 @@ class ATSTQueue(RQ):
     # pylint: disable=pointless-string-statement
     """Instance methods to queue up application-specific jobs."""
 
-    def send_mail(self, to, subject, body):
-        self._queue_job(ATSTQueue._send_mail, to, subject, body)
+    def send_mail(self, recipients, subject, body):
+        self._queue_job(ATSTQueue._send_mail, recipients, subject, body)
 
     # pylint: disable=pointless-string-statement
     """Class methods to actually perform the work.
@@ -38,8 +38,8 @@ class ATSTQueue(RQ):
     """
 
     @classmethod
-    def _send_mail(self, to, subject, body):
-        app.mailer.send(to, subject, body)
+    def _send_mail(self, recipients, subject, body):
+        app.mailer.send(recipients, subject, body)
 
 
 queue = ATSTQueue()