Replace jsonutils by ujson

ujson is faster than jsonutils, and we do not need any fancy feature jsonutils
might offer.

Change-Id: I2d8e70da055777d58ca5e6718458dd5dcf294747

fuxi_kubernetes/cmd/cinder.py

@@ -12,8 +12,8 @@
 
 """Start FlexVolume driver of Cinder"""
 
-from oslo_serialization import jsonutils
 import sys
+import ujson
 
 from fuxi_kubernetes.common import constants
 from fuxi_kubernetes.flex_volume_drivers.drivers.cinder import cinder
@@ -27,5 +27,5 @@ def main():
     """
 
     result = cinder.DriverCinder()(sys.argv[1:])
-    print(jsonutils.dumps(result()))
+    print(ujson.dumps(result()))
     sys.exit((0 if result.status == constants.STATUS_SUCCESS else 1))

fuxi_kubernetes/flex_volume_drivers/drivers/base.py

@@ -10,8 +10,8 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
-from oslo_serialization import jsonutils
 import requests
+import ujson
 
 from fuxi_kubernetes.common import constants
 from fuxi_kubernetes import exceptions
@@ -130,7 +130,7 @@ class BaseVolumeDriver(object):
 
         def _load_json_param(data):
             try:
-                return jsonutils.loads(data)
+                return ujson.loads(data)
             except Exception:
                 raise exceptions.InvalidVolumeDriverCmdParameter(
                     "can not load json parameter:(%s)" % data)

requirements.txt

@@ -3,9 +3,9 @@
 # process, which may cause wedges in the gate later.
 
 pbr!=2.1.0,>=2.0.0 # Apache-2.0
-oslo.serialization>=1.10.0 # Apache-2.0
 os-brick>=1.15.2 # Apache-2.0
 python-cinderclient>=3.1.0 # Apache-2.0
 stevedore>=1.20.0 # Apache-2.0
 Flask!=0.11,<1.0,>=0.10 # BSD
 kuryr-lib>=0.5.0 # Apache-2.0
+ujson