Added missing jsonutils.dump() function

The function is missing from the module, meaning that some module
consumers can't use jsonutils as a complete replacement for stdlib json
module.

Change-Id: Ia678d251a3984c959ae6c9d7ad70d33b197da4ff
Closes-Bug: 1338571

2 files changed, 13 insertions, 0 deletions

diff --git a/openstack/common/jsonutils.py b/openstack/common/jsonutils.py
index e4eada8..8112141 100644
--- a/openstack/common/jsonutils.py
+++ b/openstack/common/jsonutils.py
@@ -168,6 +168,10 @@ def dumps(value, default=to_primitive, **kwargs):
     return json.dumps(value, default=default, **kwargs)
 
 
+def dump(obj, fp, *args, **kwargs):
+    return json.dump(obj, fp, *args, **kwargs)
+
+
 def loads(s, encoding='utf-8', **kwargs):
     return json.loads(strutils.safe_decode(s, encoding), **kwargs)
 
diff --git a/tests/unit/test_jsonutils.py b/tests/unit/test_jsonutils.py
index 3105a69..cb9123d 100644
--- a/tests/unit/test_jsonutils.py
+++ b/tests/unit/test_jsonutils.py
@@ -44,6 +44,15 @@ class JSONUtilsTestMixin(object):
     def test_dumps(self):
         self.assertEqual('{"a": "b"}', jsonutils.dumps({'a': 'b'}))
 
+    def test_dump(self):
+        expected = '{"a": "b"}'
+        json_dict = {'a': 'b'}
+
+        fp = six.StringIO()
+        jsonutils.dump(json_dict, fp)
+
+        self.assertEqual(expected, fp.getvalue())
+
     def test_loads(self):
         self.assertEqual({'a': 'b'}, jsonutils.loads('{"a": "b"}'))