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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (C) 2018
# Matthias P. Braendli, matthias.braendli@mpb.li
#
# http://www.opendigitalradio.org
#
# This file is part of ODR-DabMod.
#
# ODR-DabMod is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# ODR-DabMod is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with ODR-DabMod. If not, see <http://www.gnu.org/licenses/>.
"""yamlrpc is json-rpc, except that it's yaml and not json."""
# Same as jsonrpc version we're aiming to mirror in YAML
YAMLRPC_VERSION = "2.0"
import yaml
import socket
import struct
def request(request_id: int, method: str, params) -> bytes:
r = {
'yamlrpc': YAMLRPC_VERSION,
'method': method,
'params': params,
'id': request_id}
return yaml.dump(r).encode()
def response_success(request_id: int, result) -> bytes:
r = {
'yamlrpc': YAMLRPC_VERSION,
'result': result,
'error': None,
'id': request_id}
return yaml.dump(r).encode()
def response_error(request_id: int, error) -> bytes:
r = {
'yamlrpc': YAMLRPC_VERSION,
'result': None,
'error': error,
'id': request_id}
return yaml.dump(r).encode()
def notification(method: str, params) -> bytes:
r = {
'yamlrpc': YAMLRPC_VERSION,
'method': method,
'params': params}
return yaml.dump(r).encode()
class Socket:
def __init__(self, bind_port: int):
self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
if bind_port > 0:
self.socket.bind(('127.0.0.1', bind_port))
def receive_request(self):
data, addr = self.socket.recvfrom(512)
y = yaml.load(data.decode())
if 'yamlrpc' not in y:
raise ValueError("Message is not yamlrpc")
if y['yamlrpc'] != YAMLRPC_VERSION:
raise ValueError("Invalid yamlrpc version")
# expect a request
try:
method = y['method']
msg_id = y['id']
params = y['params']
except KeyError:
raise ValueError("Incomplete message")
return addr, msg_id, method, params
def send_success_response(self, addr, msg_id: int, result):
self.socket.sendto(response_success(msg_id, result), addr)
def send_error_response(self, addr, msg_id: int, error):
self.socket.sendto(response_error(msg_id, error), addr)
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