Separate NIC validation

Change-Id: Icfc15cb4780d4682ed20aa2e5796578e81496c87

metalsmith/_provisioner.py

@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import collections
 import logging
 import random
 import sys
@@ -258,15 +257,10 @@ class Provisioner(object):
 
     def _get_nics(self, nics):
         """Validate and get the NICs."""
+        _utils.validate_nics(nics)
+
         result = []
-        if not isinstance(nics, collections.Sequence):
-            raise TypeError("NICs must be a list of dicts")
-
         for nic in nics:
-            if not isinstance(nic, collections.Mapping) or len(nic) != 1:
-                raise TypeError("Each NIC must be a dict with one item, "
-                                "got %s" % nic)
-
             nic_type, nic_id = next(iter(nic.items()))
             if nic_type == 'network':
                 try:
@@ -277,7 +271,7 @@ class Provisioner(object):
                         {'net': nic_id, 'error': exc})
                 else:
                     result.append((nic_type, network))
-            elif nic_type == 'port':
+            else:
                 try:
                     port = self._api.get_port(nic_id)
                 except Exception as exc:
@@ -286,9 +280,6 @@ class Provisioner(object):
                         {'port': nic_id, 'error': exc})
                 else:
                     result.append((nic_type, port))
-            else:
-                raise ValueError("Unexpected NIC type %s, supported values: "
-                                 "'port', 'network'" % nic_type)
 
         return result
 

metalsmith/_utils.py

@@ -13,6 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import collections
 import contextlib
 import json
 import os
@@ -121,3 +122,23 @@ def is_hostname_safe(hostname):
         return False
 
     return _HOSTNAME_RE.match(hostname) is not None
+
+
+def validate_nics(nics):
+    """Validate NICs."""
+    if not isinstance(nics, collections.Sequence):
+        raise TypeError("NICs must be a list of dicts")
+
+    unknown_nic_types = set()
+    for nic in nics:
+        if not isinstance(nic, collections.Mapping) or len(nic) != 1:
+            raise TypeError("Each NIC must be a dict with one item, "
+                            "got %s" % nic)
+
+        nic_type = next(iter(nic))
+        if nic_type not in ('port', 'network'):
+            unknown_nic_types.add(nic_type)
+
+    if unknown_nic_types:
+        raise ValueError("Unexpected NIC type(s) %s, supported values are "
+                         "'port' and 'network'" % ', '.join(unknown_nic_types))

metalsmith/test/test_provisioner.py

@@ -488,7 +488,7 @@ class TestProvisionNode(Base):
         self.api.release_node.assert_called_with(self.node)
 
     def test_invalid_nic_type(self):
-        self.assertRaisesRegex(ValueError, 'Unexpected NIC type foo',
+        self.assertRaisesRegex(ValueError, r'Unexpected NIC type\(s\) foo',
                                self.pr.provision_node,
                                self.node, 'image', [{'foo': 'bar'}])
         self.assertFalse(self.api.create_port.called)