(Over) Simplified JSONRPC in Python

jsonrpc_example.py

'''Very simplified JSON-RPC server with endpoint registration

Try with:

curl -X POST -H "Content-type: application/json" -d '{"jsonrpc": "2.0", "id": 1, "method": "say_hello", "params": {"name": "James", "age": 11}}' http://127.0.0.1:8000
curl -X POST -H "Content-type: application/json" -d '{"jsonrpc": "2.0", "id": 1, "method": "say_hello", "params": {"name": "James"}}' http://127.0.0.1:8000
curl -X POST -H "Content-type: application/json" -d '{"jsonrpc": "2.0", "id": 1, "method": "say_hello", "params": ["James", 10]}' http://127.0.0.1:8000
curl -X POST -H "Content-type: application/json" -d '{"jsonrpc": "2.0", "id": 1, "method": "say_hello", "params": ["James"]}' http://127.0.0.1:8000

'''
import json
import socketserver
from http import server

class RPCHandler( server.BaseHTTPRequestHandler ):
    endpoints = {}

    @staticmethod
    def register( func ):
        RPCHandler.endpoints[func.__name__] = func
        return func

    def do_POST( self ):
        try:
            # check that constent type is 'application/json'
            con_type = self.headers['Content-type'].split(';')[0]
            if con_type == 'application/json':
                # get the posted data and parse the request object
                con_len = int(self.headers['Content-length'])
                req     = json.loads( self.rfile.read(con_len).decode('utf-8') )
                # handle the request if registered
                if req['method'] in RPCHandler.endpoints:
                    if isinstance(req['params'],dict): result = RPCHandler.endpoints[req['method']]( **req['params'] )
                    else: result = RPCHandler.endpoints[req['method']]( *req['params'] )
                    resp = json.dumps({
                        'jsonrpc': '2.0',
                        'method':  req['method'],
                        'id':      req['id'],
                        'result':  result
                    }).encode('utf-8')
                    # everything after here unlikely to raise exceptions..
                    self.send_response( 200 )
                    self.send_header('Content-type','application/json')
                    self.end_headers()
                    self.wfile.write( resp )
                    return
        except: pass
        # on exception, malformed input or invalid method just send back 501
        self.send_error(501,'Malformed or invalid request, check method name and arguments!')

@RPCHandler.register
def say_hello( name, age=6 ):
    return 'Hello {}, aged {}'.format(name,age)

if __name__ == '__main__':
    address = ('',8000)
    server  = server.HTTPServer( address, RPCHandler )
    try:
        print('Server up on port {}'.format(address[1]))
        server.serve_forever()
    except KeyboardInterrupt:
        pass