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#!/usr/bin/env python2
# -*- coding: utf-8 -*-
# TRX Toolkit
# CTRL interface implementation
#
# (C) 2016-2017 by Vadim Yanitskiy <axilirator@gmail.com>
#
# All Rights Reserved
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import logging as log
from udp_link import UDPLink
class CTRLInterface(UDPLink):
def handle_rx(self, data, remote):
if not self.verify_req(data):
log.error("Wrong data on CTRL interface")
return
# Attempt to parse a command
request = self.prepare_req(data)
rc = self.parse_cmd(request)
if type(rc) is tuple:
self.send_response(request, remote, rc[0], rc[1])
else:
self.send_response(request, remote, rc)
def verify_req(self, data):
# Verify command signature
return data.startswith("CMD")
def prepare_req(self, data):
# Strip signature, paddings and \0
request = data[4:].strip().strip("\0")
# Split into a command and arguments
request = request.split(" ")
# Now we have something like ["TXTUNE", "941600"]
return request
def verify_cmd(self, request, cmd, argc):
# Check if requested command matches
if request[0] != cmd:
return False
# And has enough arguments
if len(request) - 1 != argc:
return False
return True
def send_response(self, request, remote, response_code, params = None):
# Include status code, for example ["TXTUNE", "0", "941600"]
request.insert(1, str(response_code))
# Optionally append command specific parameters
if params is not None:
request += params
# Add the response signature, and join back to string
response = "RSP " + " ".join(request) + "\0"
# Now we have something like "RSP TXTUNE 0 941600"
self.sendto(response, remote)
def parse_cmd(self, request):
raise NotImplementedError
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