Add validate_generate_args method

Improve argument validation

Change-Id: I3dade53263ed3405d1f2a195749140ba3d74c2f1
Signed-off-by: Artem Goncharov <artem.goncharov@gmail.com>

codegenerator/openapi/base.py

@@ -154,6 +154,18 @@ class OpenStackServerSourceBase:
     def generate(self, target_dir, args) -> Path:
         pass
 
+    def _validate_generate_args(self, target_dir, args):
+        """Validate common arguments for generate() methods."""
+        if target_dir is None:
+            raise RuntimeError("Missing required argument: target_dir")
+        if args is None:
+            raise RuntimeError("Missing required argument: args")
+        if not hasattr(args, "validate"):
+            raise RuntimeError("Missing required args attribute: validate")
+        if not hasattr(args, "service_type"):
+            raise RuntimeError("Missing required args attribute: service_type")
+        return Path(target_dir)
+
     def load_openapi(self, path):
         """Load existing OpenAPI spec from the file"""
         if not path.exists():

pyproject.toml

@@ -49,7 +49,7 @@ test = [
   # pip is necessary since siblings installation job uses it
   "pip",  # Apache-2.0
   "flake8-import-order~=0.19.2", # LGPLv3
-  "stestr>=1.0.0" # Apache-2.0]
+  "stestr>=1.0.0",  # Apache-2.0
 ]
 block-storage = ["cinder>=23.0"]
 compute = ["nova>=28.0"]