Add new Event type stateless

src/argus/incident/apps.py

@@ -7,9 +7,9 @@ class IncidentConfig(AppConfig):
     label = "argus_incident"
 
     def ready(self):
-        from .signals import delete_associated_user, delete_associated_event, create_start_event, send_notification
+        from .signals import delete_associated_user, delete_associated_event, create_first_event, send_notification
 
         post_delete.connect(delete_associated_user, "argus_incident.SourceSystem")
         post_delete.connect(delete_associated_event, "argus_incident.Acknowledgement")
-        post_save.connect(create_start_event, "argus_incident.Incident")
+        post_save.connect(create_first_event, "argus_incident.Incident")
         post_save.connect(send_notification, "argus_incident.Event", dispatch_uid="send_notification")

src/argus/incident/migrations/0005_alter_event_type.py

@@ -0,0 +1,35 @@
+# Generated by Django 3.2.11 on 2022-03-01 12:34
+
+from django.db import migrations, models
+
+
+def add_stateless_event_type(apps, schema_editor):
+    # Change INCIDENT_START events for stateless incidents to STATELESS
+    Event = apps.get_model('argus_incident', 'Event')
+    for event in Event.objects.all():
+        if event.type == "STA" and event.incident.end_time == None:
+            event.type="LES"
+            event.save()
+
+def remove_stateless_event_type(apps, schema_editor):
+    # undo changes made by add_stateless_event_type
+    Event = apps.get_model('argus_incident', 'Event')
+    for event in Event.objects.all():
+        if event.type == "LES":
+            event.type = "STA"
+            event.save()
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('argus_incident', '0004_add_ChangeEvent_proxy'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='event',
+            name='type',
+            field=models.CharField(choices=[('STA', 'Incident start'), ('END', 'Incident end'), ('CHI', 'Incident change'), ('CLO', 'Close'), ('REO', 'Reopen'), ('ACK', 'Acknowledge'), ('OTH', 'Other'), ('LES', 'Stateless')], max_length=3),
+        ),
+        migrations.RunPython(add_stateless_event_type, remove_stateless_event_type),
+    ]

src/argus/incident/models.py

@@ -297,6 +297,10 @@ def last_close_or_end_event(self):
     def latest_change_event(self):
         return self.events.filter(type=Event.Type.INCIDENT_CHANGE).order_by("timestamp").last()
 
+    @property
+    def stateless_event(self):
+        return self.events.filter(type=Event.Type.STATELESS).order_by("timestamp").first()
+
     @property
     def acks(self):
         return Acknowledgement.objects.filter(event__incident=self)
@@ -386,8 +390,9 @@ class Type(models.TextChoices):
         REOPEN = "REO", "Reopen"
         ACKNOWLEDGE = "ACK", "Acknowledge"
         OTHER = "OTH", "Other"
+        STATELESS = "LES", "Stateless"
 
-    ALLOWED_TYPES_FOR_SOURCE_SYSTEMS = {Type.INCIDENT_START, Type.INCIDENT_END, Type.OTHER, Type.INCIDENT_CHANGE}
+    ALLOWED_TYPES_FOR_SOURCE_SYSTEMS = {Type.INCIDENT_START, Type.INCIDENT_END, Type.OTHER, Type.INCIDENT_CHANGE, Type.STATELESS}
     ALLOWED_TYPES_FOR_END_USERS = {Type.CLOSE, Type.REOPEN, Type.ACKNOWLEDGE, Type.OTHER}
 
     incident = models.ForeignKey(to=Incident, on_delete=models.PROTECT, related_name="events")

src/argus/incident/signals.py

@@ -4,7 +4,7 @@
 
 __all__ = [
     "delete_associated_user",
-    "create_start_event",
+    "create_first_event",
     "send_notification",
     "delete_associated_event",
 ]
@@ -15,15 +15,16 @@ def delete_associated_user(sender, instance: SourceSystem, *args, **kwargs):
         instance.user.delete()
 
 
-def create_start_event(sender, instance: Incident, created, raw, *args, **kwargs):
+def create_first_event(sender, instance: Incident, created, raw, *args, **kwargs):
     if raw or not created:
         return
-    if not instance.start_event:
+    if not instance.start_event and not instance.stateless_event:
+        event_type = Event.Type.INCIDENT_START if instance.stateful else Event.Type.STATELESS
         Event.objects.create(
             incident=instance,
             actor=instance.source.user,
             timestamp=instance.start_time,
-            type=Event.Type.INCIDENT_START,
+            type=event_type,
             description=instance.description,
         )
 

src/argus/incident/views.py

@@ -357,8 +357,10 @@ def validate_incident_has_no_relation_to_event_type():
             elif event_type == Event.Type.REOPEN and incident.open:
                 self._raise_type_validation_error("The incident is already open.")
         else:
-            if event_type == Event.Type.INCIDENT_START:
+            if event_type == Event.Type.STATELESS:
                 validate_incident_has_no_relation_to_event_type()
+            elif event_type == Event.Type.INCIDENT_START:
+                self._raise_type_validation_error("Stateless incident cannot have an INCIDENT_START event.")
             elif event_type in {Event.Type.INCIDENT_END, Event.Type.CLOSE, Event.Type.REOPEN}:
                 self._raise_type_validation_error("Cannot change the state of a stateless incident.")
 

tests/incident/test_event.py

@@ -6,6 +6,7 @@
 from django.utils import timezone
 from django.utils.dateparse import parse_datetime
 from django.utils.timezone import make_aware
+from django.test import TestCase
 from rest_framework import status
 from rest_framework.test import APITestCase
 
@@ -195,3 +196,23 @@ def test_event_has_description(self):
 
         self.assertTrue(event_start)
         self.assertEqual(incident.description, incident.events.get(type="STA").description)
+
+
+class StatelessEventTests(TestCase):
+    def setUp(self):
+        disconnect_signals()
+
+    def tearDown(self):
+        connect_signals()
+
+    def test_new_stateless_incident_has_stateless_event(self):
+        source_incident_id = "abcknekkebrod"
+        incident = Incident.objects.create(
+            start_time=timezone.now(),
+            end_time=None,
+            source_incident_id=source_incident_id,
+            source=SourceSystemFactory(),
+            description=f"Incident #{source_incident_id} created for testing",
+        )
+        event_stateless = incident.events.filter(type=Event.Type.STATELESS)
+        self.assertEqual(1, event_stateless.count())