load* commands in JSON-RPC

[kannibalox]

This doesn't seem to be documented, so I'm just putting it here in case anyone else finds it useful:

All of the load.raw* commands will not work under JSON-RPC, since they take advantage of the XMLRPC binary type, which doesn't exist in JSON. Instead, the equivalent load command needs to be called with the data in a special format.

# Works with XMLRPC, but not JSON-RPC
rtxmlrpc load.raw_verbose '' @/tmp/test.torrent
# Works with JSON-RPC, but not XMLRPC
rtxmlrpc load.verbose '' @/tmp/test.torrent

The process for formatting binary data for JSON-RPC is pretty simple:

import base64
import json
xmlrpc import client as xmlrpclib

class JSONRPCEncoder(json.JSONEncoder):
    def default(self, o):
        if isinstance(o, xmlrpclib.Binary):
            return "data:base64," + base64.b64encode(o.data).decode("ascii")
        return json.JSONEncoder.default(self, o)