fix: don't send emails to VMs that were requested but not created

SUMMARY
    dash.models.Instance is created upon request and
    infrastructure.models.InstanceCreated when the instance is created.
    Using data from InstanceCreated to send invoices should solve this
    issue.

billing/management/commands/generate_invoice.py

@@ -22,6 +22,7 @@ from oauth2_provider.generators import generate_client_id, generate_client_secre
 
 from accounts.utils import gen_secret
 from dash.models import Instance
+from infrastructure.models import InstanceCreated
 from billing.utils import generate_invoice, payment_fullfilled
 
 Application = get_application_model()
@@ -33,10 +34,12 @@ class Command(BaseCommand):
     def handle(self, *args, **options):
         instances = Instance.objects.all()
         if instances:
-            for instance in Instance.objects.all():
-                self.stdout.write(f"Found instance: {instance}")
-                if not payment_fullfilled(instance=instance):
-                    self.stdout.write(f"Payment not fulfilled for instance: {instance}")
-                    payment = generate_invoice(instance=instance)
+            for paid_instance in InstanceCreated.objects.all():
+                self.stdout.write(f"Found instance: {paid_instance.instance}")
+                if not payment_fullfilled(instance=paid_instance.instance):
+                    self.stdout.write(
+                        f"Payment not fulfilled for instance: {paid_instance.instance}"
+                    )
+                    payment = generate_invoice(instance=paid_instance.instance)
         else:
             self.stdout.write("No instances available")

billing/tests.py

@@ -148,6 +148,44 @@ class GenerateInvoiceCommand(TestCase):
         register_util(t=self, username=self.username)
         create_configurations(t=self)
 
+    @override_settings(
+        HOSTEA=infra_custom_config(
+            test_name="test_dont_send_invoices_to_not_created_vms"
+        )
+    )
+    def test_dont_send_invoices_to_not_created_vms(self):
+
+        c = Client()
+        login_util(self, c, "accounts.home")
+
+        instance_name = "tnoinvonocrevm"
+
+        payload = {"name": instance_name, "configuration": self.instance_config[0].name}
+
+        resp = c.post(reverse("dash.instances.new"), payload)
+        self.assertEqual(resp.status_code, 302)
+        self.assertEqual(
+            resp.headers["location"],
+            reverse("billing.invoice.generate", args=(instance_name,)),
+        )
+
+        stdout = StringIO()
+        stderr = StringIO()
+
+        instance = Instance.objects.get(name=instance_name)
+        self.assertEqual(payment_fullfilled(instance=instance), False)
+        prev_len = len(mail.outbox)
+
+        # username exists
+        call_command(
+            "generate_invoice",
+            stdout=stdout,
+            stderr=stderr,
+        )
+        out = stdout.getvalue()
+        print(out)
+        self.assertEqual(instance_name not in out, True)
+
     @override_settings(
         HOSTEA=infra_custom_config(test_name="test_generate_invoice_cmd")
     )