Make ApiValidator to work with jsonschema>=4.0.0

As of Zed jsonschema version has been bumped to 4.14.0 in
upper-constraints, which means project should support running with
this version. This patch aims to fix ApiValidator that is not compatible
with new jsonschema.

Other deprecations, like FormatChecker.cls_checks decorator are left
intact and must be covered with follow-up patches.

We also move zuul queues to project scope as otherwise jobs do not
run due to config error.

We also replace iteritems with six method as iteritems have been dropped
from Python 3.

Change-Id: Ia8b69587aa9b3d04ffcdea7c6b97a8ae65f67534
(cherry picked from commit ebc6d74bf8)

.zuul.yaml

@@ -1,4 +1,5 @@
 - project:
+    queue: sahara
     templates:
       - openstack-python3-zed-jobs
       - periodic-stable-jobs
@@ -22,7 +23,6 @@
         - openstack-ansible-deploy-aio_sahara_metal-ubuntu-focal:
             voting: false
     gate:
-      queue: sahara
       jobs:
         - sahara-tests-scenario:
             voting: false

sahara/tests/unit/utils/test_api_validator.py

@@ -259,7 +259,7 @@ class ApiValidatorTest(testtools.TestCase):
     def test_validate_hostname(self):
         schema = {
             "type": "string",
-            "format": "hostname",
+            "format": "idn-hostname",
         }
 
         self._validate_success(schema, "abcd")

sahara/utils/api_validator.py

@@ -97,8 +97,7 @@ def validate_posix_path(entry):
     return res is not None
 
 
-class ConfigTypeMeta(type):
-    def __instancecheck__(cls, instance):
+def is_config(cls, instance):
     # configs should be dict
     if not isinstance(instance, dict):
         return False
@@ -127,8 +126,7 @@ class ConfigTypeMeta(type):
     return True
 
 
-class SimpleConfigTypeMeta(type):
-    def __instancecheck__(cls, instance):
+def is_simple_config(cls, instance):
     # configs should be dict
     if not isinstance(instance, dict):
         return False
@@ -144,18 +142,7 @@ class SimpleConfigTypeMeta(type):
     return True
 
 
-@six.add_metaclass(ConfigTypeMeta)
-class ConfigsType(dict):
-    pass
-
-
-@six.add_metaclass(SimpleConfigTypeMeta)
-class SimpleConfigsType(dict):
-    pass
-
-
-class FlavorTypeMeta(type):
-    def __instancecheck__(cls, instance):
+def is_flavor_type(cls, instance):
     try:
         int(instance)
     except (ValueError, TypeError):
@@ -165,17 +152,15 @@ class FlavorTypeMeta(type):
             and type(instance) != bool)
 
 
-@six.add_metaclass(FlavorTypeMeta)
-class FlavorType(object):
-    pass
-
-
 class ApiValidator(jsonschema.Draft4Validator):
-    def __init__(self, schema):
-        format_checker = jsonschema.FormatChecker()
-        super(ApiValidator, self).__init__(
-            schema, format_checker=format_checker, types={
-                "configs": ConfigsType,
-                "flavor": FlavorType,
-                "simple_config": SimpleConfigsType,
+
+    TYPE_CHECKER = jsonschema.Draft4Validator.TYPE_CHECKER.redefine_many({
+        "configs": is_config,
+        "flavor": is_flavor_type,
+        "simple_config": is_simple_config,
     })
+
+    def __init__(self, schema, resolver=None,
+                 format_checker=jsonschema.FormatChecker()):
+        super(ApiValidator, self).__init__(
+            schema, format_checker=format_checker)

sahara/utils/openstack/images.py

@@ -50,7 +50,7 @@ def wrap_entity(func):
 
 def _get_all_tags(image_props):
     tags = []
-    for key, value in image_props.iteritems():
+    for key, value in six.iteritems(image_props):
         if key.startswith(PROP_TAG) and value:
             tags.append(key)
     return tags
@@ -69,7 +69,7 @@ def _parse_tags(image_props):
 
 def _serialize_metadata(image):
     data = {}
-    for key, value in image.iteritems():
+    for key, value in six.iteritems(image):
         if key.startswith('_sahara') and value:
             data[key] = value
     return data