aswi2021jmsd-gitlab/src/config/configuration.py @ b593b83c

import os

import configparser
from injector import singleton

from src.constants import DEFAULT_CONNECTION_STRING

DATABASE_SECTION = "Database"
DATABASE_CONNECTION_STRING = "ConnectionString"


class Configuration:
    """
    Configuration class servers for injecting current application
    configuration all over the application
    """

    def __init__(self):
        """
        Constructor
        It must initialize all variables to their default values
        """
        self.connection_string = DEFAULT_CONNECTION_STRING


def configure_env_variable(binder):
    """
    Load configuration file stored in X509_CONFIG environment variable.
    If the file is not specified, use the default configuration
    :param binder: injector configuration binder instance
    :return: N/A
    """
    # TODO log which configuration is going to be used
    config_file = os.environ.get("X509_CONFIG")
    app_configuration = Configuration()
    # if configuration file is not specified use the default configuration
    if config_file is not None:
        config = configparser.ConfigParser()
        config.read(config_file)

        if config[DATABASE_SECTION] is not None:
            database_config = config[DATABASE_SECTION]
            app_configuration.connection_string = database_config.get(DATABASE_CONNECTION_STRING,
                                                                      DEFAULT_CONNECTION_STRING)

    binder.bind(Configuration, to=app_configuration, scope=singleton)