fix xmlrpc encoding error

koji/__init__.py

@@ -2400,6 +2400,14 @@ class ClientSession(object):
         else:
             handler = self.baseurl
         request = dumps(args, name, allow_none=1)
+        try:
+            request.encode('latin-1')
+        except (UnicodeEncodeError, UnicodeDecodeError):
+            # py2 string throws UnicodeDecodeError
+            # py3 string throws UnicodeEncodeError
+            # if string is not converted to UTF, requests will raise an error
+            # on identical check before sending data
+            request = request.encode('utf-8')
         headers = [
             # connection class handles Host
             ('User-Agent', 'koji/1'),

koji/xmlrpcplus.py

@@ -75,7 +75,7 @@ def dumps(params, methodname=None, methodresponse=None, encoding=None,
     if isinstance(params, Fault):
         methodresponse = 1
     elif not isinstance(params, tuple):
-        raise TypeError('params must be a tuple of Fault instance')
+        raise TypeError('params must be a tuple or Fault instance')
     elif methodresponse and len(params) != 1:
         raise ValueError('response tuple must be a singleton')