Extract and reuse kubernetes name validator

src/servala/core/models/organization.py

@@ -1,7 +1,6 @@
 import rules
 import urlman
 from django.conf import settings
-from django.core.validators import RegexValidator
 from django.db import models
 from django.utils.functional import cached_property
 from django.utils.text import slugify
@@ -10,6 +9,7 @@ from django_scopes import ScopedManager, scopes_disabled
 
 from servala.core import rules as perms
 from servala.core.models.mixins import ServalaModelMixin
+from servala.core.validators import kubernetes_name_validator
 
 
 class Organization(ServalaModelMixin, models.Model):
@@ -21,16 +21,7 @@ class Organization(ServalaModelMixin, models.Model):
         help_text=_(
             "This namespace will be used for all Kubernetes resources. Cannot be changed after creation."
         ),
-        validators=[
-            RegexValidator(
-                regex=r"^[a-z0-9]([-a-z0-9]*[a-z0-9])?$",
-                message=_(
-                    'Namespace must consist of lowercase alphanumeric characters or "-", '
-                    "must start and end with an alphanumeric character."
-                ),
-                code="invalid_namespace",
-            )
-        ],
+        validators=[kubernetes_name_validator],
     )
 
     billing_entity = models.ForeignKey(

src/servala/core/models/service.py

@@ -9,6 +9,7 @@ from kubernetes import config
 from kubernetes.client.rest import ApiException
 
 from servala.core.models.mixins import ServalaModelMixin
+from servala.core.validators import kubernetes_name_validator
 
 
 class ServiceCategory(ServalaModelMixin, models.Model):
@@ -16,7 +17,9 @@ class ServiceCategory(ServalaModelMixin, models.Model):
     Categories for services, e.g. "Databases", "Storage", "Compute".
     """
 
-    name = models.CharField(max_length=100, verbose_name=_("Name"))
+    name = models.CharField(
+        max_length=100, verbose_name=_("Name"), validators=[kubernetes_name_validator]
+    )
     description = models.TextField(blank=True, verbose_name=_("Description"))
     logo = models.ImageField(
         upload_to="public/service_categories",
@@ -446,3 +449,6 @@ class ServiceInstance(ServalaModelMixin, models.Model):
     class Meta:
         verbose_name = _("Service instance")
         verbose_name_plural = _("Service instances")
+        # Names are unique per de-facto namespace, which is defined by the
+        # Organization + ServiceDefinition (group, version) + the ControlPlane.
+        unique_together = [("name", "organization", "context")]

src/servala/core/validators.py

@@ -0,0 +1,12 @@
+from django.core.validators import RegexValidator
+from django.utils.translation import gettext_lazy as _
+
+# Kubernetes resource name validator - follows the same rules as namespace names
+kubernetes_name_validator = RegexValidator(
+    regex=r"^[a-z0-9]([-a-z0-9]*[a-z0-9])?$",
+    message=_(
+        'Name must consist of lowercase alphanumeric characters or "-", '
+        "must start and end with an alphanumeric character."
+    ),
+    code="invalid_kubernetes_name",
+)