Move the missing argument verification in a wsme.runtime module so that it can be used in all adapters

wsme/rest/args.py

@@ -9,6 +9,7 @@ from wsme.exc import ClientSideError, UnknownArgument
 from wsme.types import iscomplex, list_attributes, Unset
 from wsme.types import UserType, ArrayType, DictType, File
 from wsme.utils import parse_isodate, parse_isotime, parse_isodatetime
+import wsme.runtime
 
 ARRAY_MAX_SIZE = 1000
 
@@ -273,8 +274,10 @@ def get_args(funcdef, args, kwargs, params, form, body, mimetype):
         (from_params, from_form_params, from_body)
     )
 
-    return combine_args(
+    args, kwargs = combine_args(
         funcdef,
         (from_args, from_params_and_body),
         allow_override=True
     )
+    wsme.runtime.check_arguments(funcdef, args, kwargs)
+    return args, kwargs

wsme/rest/protocol.py

@@ -6,6 +6,7 @@ from wsme.protocol import CallContext, Protocol
 
 import wsme.rest
 import wsme.rest.args
+import wsme.runtime
 
 log = logging.getLogger(__name__)
 
@@ -120,7 +121,7 @@ class RestProtocol(Protocol):
             (wsme.rest.args.args_from_params(funcdef, request.params),
              wsme.rest.args.args_from_body(funcdef, body, context.inmime))
         )
-        assert len(args) == 0
+        wsme.runtime.check_arguments(funcdef, args, kwargs)
         return kwargs
 
     def encode_result(self, context, result):

wsme/root.py

@@ -7,7 +7,7 @@ import six
 
 import webob
 
-from wsme.exc import ClientSideError, MissingArgument, UnknownFunction
+from wsme.exc import ClientSideError, UnknownFunction
 from wsme.protocol import getprotocol
 from wsme.rest import scan_api
 from wsme import spore
@@ -180,10 +180,6 @@ class WSRoot(object):
             kw = protocol.read_arguments(context)
             args = list(args)
 
-            for arg in context.funcdef.arguments:
-                if arg.mandatory and arg.name not in kw:
-                    raise MissingArgument(arg.name)
-
             txn = self.begin()
             try:
                 result = context.func(*args, **kw)

wsme/runtime.py

@@ -0,0 +1,9 @@
+from wsme.exc import MissingArgument
+
+
+def check_arguments(funcdef, args, kw):
+    """Check if some arguments are missing"""
+    assert len(args) == 0
+    for arg in funcdef.arguments:
+        if arg.mandatory and arg.name not in kw:
+            raise MissingArgument(arg.name)