How to use the ovs.jsonrpc.Connection function in ovs

def do_request(name, method, params_string):
    params = ovs.json.from_string(params_string)
    msg = ovs.jsonrpc.Message.create_request(method, params)
    s = msg.is_valid()
    if s:
        sys.stderr.write("not a valid JSON-RPC request: %s\n" % s)
        sys.exit(1)

    error, stream = ovs.stream.Stream.open_block(ovs.stream.Stream.open(name))
    if error:
        sys.stderr.write("could not open \"%s\": %s\n"
                         % (name, os.strerror(error)))
        sys.exit(1)

    rpc = ovs.jsonrpc.Connection(stream)

    error = rpc.send(msg)
    if error:
        sys.stderr.write("could not send request: %s\n" % os.strerror(error))
        sys.exit(1)

    error, msg = rpc.recv_block()
    if error:
        sys.stderr.write("error waiting for reply: %s\n" % os.strerror(error))
        sys.exit(1)

    print(ovs.json.to_string(msg.to_json()))

    rpc.close()

def do_notify(name, method, params_string):
    params = ovs.json.from_string(params_string)
    msg = ovs.jsonrpc.Message.create_notify(method, params)
    s = msg.is_valid()
    if s:
        sys.stderr.write("not a valid JSON-RPC notification: %s\n" % s)
        sys.exit(1)

    error, stream = ovs.stream.Stream.open_block(ovs.stream.Stream.open(name))
    if error:
        sys.stderr.write("could not open \"%s\": %s\n"
                         % (name, os.strerror(error)))
        sys.exit(1)

    rpc = ovs.jsonrpc.Connection(stream)

    error = rpc.send_block(msg)
    if error:
        sys.stderr.write("could not send notification: %s\n"
                         % os.strerror(error))
        sys.exit(1)

    rpc.close()

# that the parent process created.
        error, pstream = ovs.stream.PassiveStream.open(name)
        if error:
            sys.stderr.write("could not listen on \"%s\": %s\n"
                             % (name, os.strerror(error)))
            sys.exit(1)

    ovs.daemon.daemonize()

    rpcs = []
    done = False
    while True:
        # Accept new connections.
        error, stream = pstream.accept()
        if stream:
            rpcs.append(ovs.jsonrpc.Connection(stream))
        elif error != errno.EAGAIN:
            sys.stderr.write("PassiveStream.accept() failed\n")
            sys.exit(1)

        # Service existing connections.
        dead_rpcs = []
        for rpc in rpcs:
            rpc.run()

            error = 0
            if not rpc.get_backlog():
                error, msg = rpc.recv()
                if not error:
                    if handle_rpc(rpc, msg):
                        done = True

'list-columns': self._list_columns,
            'transact': self._transact,
            'monitor': self._monitor,
            'dump': self._dump,
        }

        command = args[0]
        args = args[1:]

        error, stream_ = stream.Stream.open_block(
            stream.Stream.open(self.remote))
        if error:
            RuntimeError('can not open socket to %s: %s' %
                         (self.remote, os.strerror(error)))
            raise
        rpc = jsonrpc.Connection(stream_)

        ret = _COMMANDS[command](rpc, *args)
        LOG.info('ret %s', ret)
        rpc.close()

def factory(cls, sock, address, probe_interval=None, min_backoff=None,
                max_backoff=None, schema_tables=None,
                schema_exclude_columns=None, *args, **kwargs):
        schema_exclude_columns = schema_exclude_columns or {}
        ovs_stream = stream.Stream(sock, None, None)
        connection = jsonrpc.Connection(ovs_stream)
        schemas = discover_schemas(connection)

        if not schemas:
            return

        if schema_tables or schema_exclude_columns:
            schemas = _filter_schemas(schemas, schema_tables,
                                      schema_exclude_columns)

        fsm = reconnect.Reconnect(now())
        fsm.set_name('%s:%s' % address[:2])
        fsm.enable(now())
        fsm.set_passive(True, now())
        fsm.set_max_tries(-1)

        if probe_interval is not None:

def _rpc_get_schema_json(self, database):
        LOG.debug('remote %s', self.remote)
        error, stream_ = stream.Stream.open_block(
            stream.Stream.open(self.remote))
        if error:
            vsctl_fatal('error %s' % os.strerror(error))
        rpc = jsonrpc.Connection(stream_)
        request = jsonrpc.Message.create_request('get_schema', [database])
        error, reply = rpc.transact_block(request)
        rpc.close()

        if error:
            vsctl_fatal(os.strerror(error))
        elif reply.error:
            vsctl_fatal('error %s' % reply.error)
        return reply.result