Replace voluptuous with JSONSchema to validate sleep action

Now in watcher,both JSONSchema and voluptuous are used to validate
JSON payloads. We want to remove voluptuous and Use
JSONSchema as our only JSON validation tool to keep consistence
and also to make it easier to expose the validation schema
through our API in future work.

In this patch, we replace voluptuous with JSONSchema to validate
the sleep action in watcher applier.

Partially Implements: blueprint jsonschema-validation

Change-Id: I3032490236536a11e7045a56ad0bd40ef979407e

watcher/applier/actions/sleep.py

@@ -17,11 +17,10 @@
 # limitations under the License.
 #
 
+import jsonschema
 import time
 
 from oslo_log import log
-import voluptuous
-
 from watcher.applier.actions import base
 
 LOG = log.getLogger(__name__)
@@ -43,10 +42,24 @@ class Sleep(base.BaseAction):
 
     @property
     def schema(self):
-        return voluptuous.Schema({
-            voluptuous.Required(self.DURATION, default=1):
-                voluptuous.All(float, voluptuous.Range(min=0))
-        })
+        return {
+            'type': 'object',
+            'properties': {
+                'duration': {
+                    'type': 'number',
+                    'minimum': 0
+                },
+            },
+            'required': ['duration'],
+            'additionalProperties': False,
+        }
+
+    def validate_parameters(self):
+        try:
+            jsonschema.validate(self.input_parameters, self.schema)
+            return True
+        except jsonschema.ValidationError as e:
+            raise e
 
     @property
     def duration(self):

watcher/tests/applier/actions/test_sleep.py

@@ -13,8 +13,9 @@
 # limitations under the License.
 #
 
+
+import jsonschema
 import mock
-import voluptuous
 
 from watcher.applier.actions import sleep
 from watcher.tests import base
@@ -31,12 +32,15 @@ class TestSleep(base.TestCase):
 
     def test_parameters_duration_empty(self):
         self.s.input_parameters = {self.s.DURATION: None}
-        self.assertRaises(voluptuous.Invalid, self.s.validate_parameters)
+        self.assertRaises(jsonschema.ValidationError,
+                          self.s.validate_parameters)
 
     def test_parameters_wrong_parameter(self):
         self.s.input_parameters = {self.s.DURATION: "ef"}
-        self.assertRaises(voluptuous.Invalid, self.s.validate_parameters)
+        self.assertRaises(jsonschema.ValidationError,
+                          self.s.validate_parameters)
 
     def test_parameters_add_field(self):
         self.s.input_parameters = {self.s.DURATION: 1.0, "not_required": "nop"}
-        self.assertRaises(voluptuous.Invalid, self.s.validate_parameters)
+        self.assertRaises(jsonschema.ValidationError,
+                          self.s.validate_parameters)