pybind: encode flattened dict

in python3, the keys and values in dict are unicode strings, so we need
to encode them before passing them to underlying librados' C API.

Signed-off-by: Kefu Chai <kchai@redhat.com>
(cherry picked from commit 6cb23f9ce6b3848a7fd93d135acc143f2ae7cba1)

diff --git a/src/pybind/rados/rados.pyx b/src/pybind/rados/rados.pyx
index dbd150540b67d6f58df4694d983ba9d96bcd3ecc..b281ce69001bec6fa8b9fabd44649fb9aec4acb6 100644 (file)
--- a/src/pybind/rados/rados.pyx
+++ b/src/pybind/rados/rados.pyx
@@ -559,7 +559,7 @@ def decode_cstr(val, encoding="utf-8"):
 
 def flatten_dict(d):
     items = chain.from_iterable(d.items())
-    return ''.join(i + '\0' for i in items)
+    return cstr(''.join(i + '\0' for i in items))
 
 
 cdef char* opt_str(s) except? NULL: