Added command line arguments.

.gitignore

@@ -1 +1,3 @@
 /res/db/database.db
+/res/db/
+*__pycache__/

config.py

@@ -1,9 +1,12 @@
 from os import getenv
 from dataclasses import dataclass
+from argparse import ArgumentParser, Namespace
+
+from utils import Singleton
 
 
 @dataclass
-class Config:
+class Config(metaclass=Singleton):
     """
     Notifier config dataclass.
 
@@ -19,38 +22,100 @@ class Config:
 
 
 class ConfigError(Exception):
+    """Config error exception."""
     pass
 
 
-_teletoken = getenv('LTLNOTIFIER_TELETOKEN')
-# Check api token
-if not _teletoken:
-    raise ConfigError('virtual environment LTLNOTIFIER_TELETOKEN not set.')
-if len(_teletoken) != 45 or _teletoken[9] != ':' or not _teletoken[:9].isdigit():
-    raise ConfigError('virtual environment LTLNOTIFIER_TELETOKEN incorrect.')
+def _get_teletoken(cmd_arguments: Namespace) -> str:
+    """
+        Get Telegram bot token.
+        Can raise **ConfigError** if Telegram token not set or incorrect.
 
-_bot_owner = getenv('LTLNOTIFIER_BOT_OWNER')
-# Check bot owner
-if not _bot_owner:
-    raise ConfigError('virtual environment LTLNOTIFIER_BOT_OWNER not set.')
+        :param cmd_arguments: command line arguments.
+        :return: Telegram bot token.
+    """
+    teletoken = cmd_arguments.teletoken or getenv('LTLNOTIFYER_TELETOKEN')
+    if not teletoken:
+        raise ConfigError('Telegram token not set.')
+    if len(teletoken) != 45 or \
+            teletoken[9] != ':' \
+            or not teletoken[:9].isdigit():
+        raise ConfigError('Telegram token incorrect.')
+    return teletoken
+
+
+def _get_bot_owner_id(cmd_arguments: Namespace) -> int:
+    """
+        Get bot owner telegram id.
+        Can raise **ConfigError** if bot owner id not set or incorrect.
+
+        :param cmd_arguments: command line arguments.
+        :return: bot owner Telegram id.
+    """
+    bot_owner = getenv('LTLNOTIFYER_BOT_OWNER')
+    if not bot_owner:
+        raise ConfigError('Bot owner telegram id not set.')
     try:
-    if len(_bot_owner) != 9:
+        if len(bot_owner) != 9:
             raise ValueError
-    _bot_owner = int(_bot_owner)
+        bot_owner = int(bot_owner)
     except ValueError:
-    raise ConfigError('virtual environment LTLNOTIFIER_BOT_OWNER incorrect.')
+        raise ConfigError('Bot owner telegram id incorrect.')
+    return bot_owner
 
-_base_url = getenv('LTLNOTIFIER_BASE_URL')
-# Check base url
-if not _base_url:
-    raise ConfigError('virtual environment LTLNOTIFIER_BASE_URL not set')
 
-_port = getenv('LTLNOTIFIER_PORT', default='')
-_port = int(_port) if _port.isdigit() else 3001
+def _get_base_url(cmd_arguments: Namespace) -> str:
+    """
+        Get server base url.
+        Can raise **Config error** if base url not set.
 
-config = Config(teletoken=_teletoken,
-                port=_port,
-                bot_owner=_bot_owner,
-                base_url=_base_url)
+        :param cmd_arguments: command line arguments.
+        :return: server base url.
+        """
+    base_url = cmd_arguments.base_url or getenv('LTLNOTIFYER_BASE_URL')
+    if not base_url:
+        raise ConfigError('Server base url not set.')
 
-__all__ = ('Config', 'config')
+
+def _get_port(cmd_arguments: Namespace) -> int:
+    """
+        Get server port.
+
+        :param cmd_arguments: command line arguments.
+        :return:
+        """
+    port = cmd_arguments.port or getenv('LTLNOTIFIER_PORT', default='')
+    port = int(port) if port.isdigit() else 3001
+
+
+def _init_config(arguments) -> None:
+    teletoken = _get_teletoken(arguments)
+    bot_owner = _get_bot_owner_id(arguments)
+    base_url, port = _get_base_url(arguments)
+    Config(teletoken=teletoken,
+           port=port,
+           bot_owner=bot_owner,
+           base_url=base_url)
+
+
+_parser = ArgumentParser(description="ltlNotifyer server.")
+_parser.add_argument('--teletoken', default='',
+                     help='Telegram bot token.\n'
+                          'Must be set if LTLNOTIFYER_TELETOKEN environment'
+                          'variable not set.')
+_parser.add_argument('--owner', default='',
+                     help='Bot owner Telegram id.\n'
+                          'Must be set if LTLNOTIFYER_BOT_OWNER environment'
+                          'variable not set.')
+_parser.add_argument('--base_url', default='',
+                     help='Server base url.\n'
+                          'Must be set if LTLNOTIFIER_BASE_URL environment'
+                          'variable not set.')
+_parser.add_argument('--port', default='',
+                     help='Server port (default = 3001. \n'
+                          'Can be set in LTLNOTIFYER_PORT environment '
+                          'variable.')
+
+_init_config(_parser.parse_args())
+
+__all__ = ('Config',)