Merge pull request #2153 from cisagov/nl/1780-check-SES-before-adding-user

Issue #1780: Don't add user to a domain invitation if we don't have a connection to SES

src/registrar/utility/email.py

@@ -32,8 +32,9 @@ def send_templated_email(
     template_name and subject_template_name are relative to the same template
     context as Django's HTML templates. context gives additional information
     that the template may use.
+
+    Raises EmailSendingError if SES client could not be accessed
     """
-    logger.info(f"An email was sent! Template name: {template_name} to {to_address}")
     template = get_template(template_name)
     email_body = template.render(context=context)
 
@@ -48,7 +49,9 @@ def send_templated_email(
             aws_secret_access_key=settings.AWS_SECRET_ACCESS_KEY,
             config=settings.BOTO_CONFIG,
         )
+        logger.info(f"An email was sent! Template name: {template_name} to {to_address}")
     except Exception as exc:
+        logger.debug("E-mail unable to send! Could not access the SES client.")
         raise EmailSendingError("Could not access the SES client.") from exc
 
     destination = {"ToAddresses": [to_address]}

src/registrar/views/domain.py

@@ -734,7 +734,10 @@ class DomainAddUserView(DomainFormBaseView):
         does not make a domain information object
         email: string- email to send to
         add_success: bool- default True indicates:
-          adding a success message to the view if the email sending succeeds"""
+        adding a success message to the view if the email sending succeeds
+
+        raises EmailSendingError
+        """
 
         # Set a default email address to send to for staff
         requestor_email = settings.DEFAULT_FROM_EMAIL
@@ -762,33 +765,43 @@ class DomainAddUserView(DomainFormBaseView):
                     "requestor_email": requestor_email,
                 },
             )
-        except EmailSendingError:
-            messages.warning(self.request, "Could not send email invitation.")
+        except EmailSendingError as exc:
             logger.warn(
                 "Could not sent email invitation to %s for domain %s",
                 email,
                 self.object,
                 exc_info=True,
             )
+            raise EmailSendingError("Could not send email invitation.") from exc
         else:
             if add_success:
                 messages.success(self.request, f"{email} has been invited to this domain.")
 
     def _make_invitation(self, email_address: str, requestor: User):
         """Make a Domain invitation for this email and redirect with a message."""
-        invitation, created = DomainInvitation.objects.get_or_create(email=email_address, domain=self.object)
-        if not created:
+        # Check to see if an invite has already been sent (NOTE: we do not want to create an invite just yet.)
+        try:
+            invite = DomainInvitation.objects.get(email=email_address, domain=self.object)
             # that invitation already existed
-            messages.warning(
-                self.request,
-                f"{email_address} has already been invited to this domain.",
-            )
-        else:
-            self._send_domain_invitation_email(email=email_address, requestor=requestor)
+            if invite is not None:
+                messages.warning(
+                    self.request,
+                    f"{email_address} has already been invited to this domain.",
+                )
+        except DomainInvitation.DoesNotExist:
+            # Try to send the invitation.  If it succeeds, add it to the DomainInvitation table.
+            try:
+                self._send_domain_invitation_email(email=email_address, requestor=requestor)
+            except EmailSendingError:
+                messages.warning(self.request, "Could not send email invitation.")
+            else:
+                # (NOTE: only create a domainInvitation if the e-mail sends correctly)
+                DomainInvitation.objects.get_or_create(email=email_address, domain=self.object)
         return redirect(self.get_success_url())
 
     def form_valid(self, form):
-        """Add the specified user on this domain."""
+        """Add the specified user on this domain.
+        Throws EmailSendingError."""
         requested_email = form.cleaned_data["email"]
         requestor = self.request.user
         # look up a user with that email
@@ -799,7 +812,22 @@ class DomainAddUserView(DomainFormBaseView):
             return self._make_invitation(requested_email, requestor)
         else:
             # if user already exists then just send an email
-            self._send_domain_invitation_email(requested_email, requestor, add_success=False)
+            try:
+                self._send_domain_invitation_email(requested_email, requestor, add_success=False)
+            except EmailSendingError:
+                logger.warn(
+                    "Could not send email invitation (EmailSendingError)",
+                    self.object,
+                    exc_info=True,
+                )
+                messages.warning(self.request, "Could not send email invitation.")
+            except Exception:
+                logger.warn(
+                    "Could not send email invitation (Other Exception)",
+                    self.object,
+                    exc_info=True,
+                )
+                messages.warning(self.request, "Could not send email invitation.")
 
         try:
             UserDomainRole.objects.create(