Replace voluptuous with JSONSchema to validate migration 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 migration action in watcher applier.

Partially Implements: blueprint jsonschema-validation

Change-Id: I02bff5db9bd06567bcc33b61a316c42c805bb20e

watcher/applier/actions/migration.py

@@ -17,15 +17,13 @@
 # limitations under the License.
 #
 
-from oslo_log import log
-import six
-import voluptuous
 
+import jsonschema
+from oslo_log import log
 from watcher._i18n import _
 from watcher.applier.actions import base
 from watcher.common import exception
 from watcher.common import nova_helper
-from watcher.common import utils
 
 LOG = log.getLogger(__name__)
 
@@ -62,28 +60,42 @@ class Migrate(base.BaseAction):
     DESTINATION_NODE = 'destination_node'
     SOURCE_NODE = 'source_node'
 
-    def check_resource_id(self, value):
-        if (value is not None and
-                len(value) > 0 and not
-                utils.is_uuid_like(value)):
-            raise voluptuous.Invalid(_("The parameter "
-                                       "resource_id is invalid."))
-
     @property
     def schema(self):
-        return voluptuous.Schema({
-            voluptuous.Required(self.RESOURCE_ID): self.check_resource_id,
-            voluptuous.Required(
-                self.MIGRATION_TYPE, default=self.LIVE_MIGRATION):
-                    voluptuous.Any(
-                        *[self.LIVE_MIGRATION, self.COLD_MIGRATION]),
-            voluptuous.Required(self.DESTINATION_NODE):
-                voluptuous.All(voluptuous.Any(*six.string_types),
-                               voluptuous.Length(min=1)),
-            voluptuous.Required(self.SOURCE_NODE):
-                voluptuous.All(voluptuous.Any(*six.string_types),
-                               voluptuous.Length(min=1)),
-        })
+        return {
+            'type': 'object',
+            'properties': {
+                'destination_node': {
+                    'type': 'string',
+                    "minLength": 1
+                },
+                'migration_type': {
+                    'type': 'string',
+                    "enum": ["live", "cold"]
+                },
+                'resource_id': {
+                    'type': 'string',
+                    "minlength": 1,
+                    "pattern": ("^([a-fA-F0-9]){8}-([a-fA-F0-9]){4}-"
+                                "([a-fA-F0-9]){4}-([a-fA-F0-9]){4}-"
+                                "([a-fA-F0-9]){12}$")
+                },
+                'source_node': {
+                    'type': 'string',
+                    "minLength": 1
+                    }
+            },
+            'required': ['destination_node', 'migration_type',
+                         'resource_id', 'source_node'],
+            '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 instance_uuid(self):
@@ -137,7 +149,6 @@ class Migrate(base.BaseAction):
             LOG.critical("Unexpected error occurred. Migration failed for "
                          "instance %s. Leaving instance on previous "
                          "host.", self.instance_uuid)
-
         return result
 
     def migrate(self, destination):