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import os
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import configparser
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from injector import singleton
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from src.constants import DEFAULT_CONNECTION_STRING
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DATABASE_SECTION = "Database"
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DATABASE_CONNECTION_STRING = "ConnectionString"
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class Configuration:
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"""
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Configuration class servers for injecting current application
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configuration all over the application
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"""
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def __init__(self):
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"""
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Constructor
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It must initialize all variables to their default values
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"""
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self.connection_string = DEFAULT_CONNECTION_STRING
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def configure_env_variable(binder):
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"""
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Load configuration file stored in X509_CONFIG environment variable.
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If the file is not specified, use the default configuration
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:param binder: injector configuration binder instance
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:return: N/A
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"""
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# TODO log which configuration is going to be used
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config_file = os.environ.get("X509_CONFIG")
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app_configuration = Configuration()
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# if configuration file is not specified use the default configuration
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if config_file is not None:
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config = configparser.ConfigParser()
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config.read(config_file)
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if config[DATABASE_SECTION] is not None:
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database_config = config[DATABASE_SECTION]
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app_configuration.connection_string = database_config.get(DATABASE_CONNECTION_STRING,
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DEFAULT_CONNECTION_STRING)
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binder.bind(Configuration, to=app_configuration, scope=singleton)
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