Switch client to JSON-RPC

Modify ipalib.rpc to support JSON-RPC in addition to XML-RPC.
This is done by subclassing and extending xmlrpclib, because
our existing code relies on xmlrpclib internals.

The URI to use is given in the new jsonrpc_uri env variable. When
it is not given, it is generated from xmlrpc_uri by replacing
/xml with /json.

The rpc_json_uri env variable existed before, but was unused,
undocumented and not set the install scripts.
This patch removes it in favor of jsonrpc_uri (for consistency
with xmlrpc_uri).

Add the rpc_protocol env variable to control the protocol
IPA uses. rpc_protocol defaults to 'jsonrpc', but may be changed
to 'xmlrpc'.
Make backend.Executioner and tests use the backend specified by
rpc_protocol.

For compatibility with unwrap_xml, decoding JSON now gives tuples
instead of lists.

Design: http://freeipa.org/page/V3/JSON-RPC
Ticket: https://fedorahosted.org/freeipa/ticket/3299

1 files changed, 3 insertions, 3 deletions

diff --git a/ipalib/frontend.py b/ipalib/frontend.py
index f478ef098..4d0333e0d 100644
--- a/ipalib/frontend.py
+++ b/ipalib/frontend.py
@@ -742,7 +742,7 @@ class Command(HasParam):
         actually work this command performs is executed locally.
 
         If running in a non-server context, `Command.forward` is called,
-        which forwards this call over XML-RPC to the exact same command
+        which forwards this call over RPC to the exact same command
         on the nearest IPA server and the actual work this command
         performs is executed remotely.
         """
@@ -777,9 +777,9 @@ class Command(HasParam):
 
     def forward(self, *args, **kw):
         """
-        Forward call over XML-RPC to this same command on server.
+        Forward call over RPC to this same command on server.
         """
-        return self.Backend.xmlclient.forward(self.name, *args, **kw)
+        return self.Backend.rpcclient.forward(self.name, *args, **kw)
 
     def _on_finalize(self):
         """