stdd/stddlib/configuration.py

# -*- coding: utf-8-*-
#
# This file is part of stdd, the simple time display daemon,
# written by Helmut Pozimski <helmut@pozimski.eu>,
# licensed under the 3-clause BSD license

""" This module reads the configuration from the main configuration file and
 exposes it to other modules for further processing.
 """

import datetime
import json


class Conf(object):
    """ Represents the configuration and allows accessing it's valued through
    public attributes.
    """
    def __init__(self):
        """creates the object prepopulated with some reasonable default
        values

        """
        self._values = {
            "hw_address": "",
            "blink_colon": "0",
            "brightness_high": "15",
            "brightness_low": "2",
            "set_brightness_low": "00:00",
            "set_brightness_high": "00:00",
            "syslog_level": "info",
            "syslog_facility": "user"
            }

        """ declare empty variables to write the checked values into """
        self.hw_address = 0
        self.blink_colon = False
        self.brightness_high = 0
        self.brightness_low = 0
        self.set_brightness_low = None
        self.set_brightness_high = None
        self.syslog_level = ""
        self.syslog_facility = ""

    def read(self, file_path="/etc/stdd.json"):
        """reads the configuration file from the path given to the function,
        default to /etc/stdd.conf if empty"""
        conffile = open(file_path, "r")
        config_read = json.load(conffile)
        for value in config_read:
            if value:
                self._values[value] = config_read[value]
        conffile.close()

    def analyze(self):
        """takes the values from the list, converts them to the needed data
        types and writes them into the prepared attributes

        """
        self.hw_address = int(self._values["hw_address"], 16)
        self.blink_colon = self._values["blink_colon"]
        self.brightness_high = self._values["brightness_high"]
        self.brightness_low = self._values["brightness_low"]
        timetemp = self._values["set_brightness_high"].split(":")
        self.set_brightness_high = datetime.time(int(timetemp[0]),
                                                 int(timetemp[1]))
        timetemp = self._values["set_brightness_low"].split(":")
        self.set_brightness_low = datetime.time(int(timetemp[0]),
                                                int(timetemp[1]))
        self.syslog_level = self._values["syslog_level"]
        self.syslog_facility = self._values["syslog_facility"]
        del self._values