Feature/initial (#1)

* initial commit
* systemd service implementation

EHSArguments.py

@@ -0,0 +1,89 @@
+import argparse
+import os
+from EHSExceptions import ArgumentException
+
+from CustomLogger import logger, setDebugMode
+
+class EHSArguments:
+    """
+    EHSArguments is a singleton class that handles command-line arguments for the EHS Sentinel script.
+    Attributes:
+        CONFIGFILE (str): Path to the configuration file.
+        DRYRUN (bool): Flag indicating if the script should run in dry run mode.
+        DUMPFILE (str): Path to the dump file.
+        _instance (EHSArguments): Singleton instance of the class.
+    Methods:
+        __new__(cls, *args, **kwargs): Ensures only one instance of the class is created.
+        __init__(self): Initializes the class, parses command-line arguments, and sets attributes.
+    """
+
+    CONFIGFILE = ''
+    DRYRUN = False
+    DUMPFILE = ''
+
+    _instance = None
+
+    def __new__(cls, *args, **kwargs):
+        """
+        Create and return a new instance of the class, ensuring that only one instance exists (singleton pattern).
+        This method overrides the default behavior of object creation to implement the singleton pattern. 
+        It checks if an instance of the class already exists; if not, it creates a new instance and marks it as uninitialized.
+        Args:
+            *args: Variable length argument list.
+            **kwargs: Arbitrary keyword arguments.
+        Returns:
+            EHSArguments: The singleton instance of the EHSArguments class.
+        """
+
+        if not cls._instance:
+            cls._instance = super(EHSArguments, cls).__new__(cls, *args, **kwargs)
+            cls._instance._initialized = False
+        return cls._instance
+
+    def __init__(self):
+        """
+        Initializes the EHSArguments class, parses command-line arguments, and sets up configuration.
+        This method performs the following steps:
+        1. Checks if the class has already been initialized to prevent re-initialization.
+        2. Sets up an argument parser to handle command-line arguments.
+        3. Parses the command-line arguments and validates them.
+        4. Checks if the specified config file and dump file exist.
+        5. Sets the class attributes based on the parsed arguments.
+        Raises:
+            ArgumentException: If the required arguments are not provided or if the specified files do not exist.
+        """
+        if self._initialized:
+            return
+        self._initialized = True
+        logger.debug("init EHSArguments")
+        parser = argparse.ArgumentParser(description="Process some integers.")
+        parser.add_argument('--configfile', type=str, required=True, help='Config file path')
+        parser.add_argument('--dumpfile', type=str,  required=False, help='File Path for where the Dumpfile should be written to or read from if dryrun flag is set too.')
+        parser.add_argument('--dryrun', action='store_true', default=False, required=False, help='Run the script in dry run mode, data will be read from DumpFile and not MQTT Message will be sent.')
+        parser.add_argument('--clean-known-devices', action='store_true', default=False, required=False, help='Cleans the know Devices Topic on Startup.')
+        parser.add_argument('-v', '--verbose', action='store_true', default=False, required=False, help='Enable verbose mode')
+
+        args = parser.parse_args()
+
+        if args.verbose:
+            setDebugMode()
+
+        logger.debug(args)
+
+        if args.dryrun:
+            if args.dumpfile is None:
+                raise ArgumentException(argument="--dumpfile")
+            else:
+                if not os.path.isfile(args.dumpfile):
+                    raise ArgumentException(argument=args.dumpfile, message="Dump File does not exist")
+            
+        # Check if the config file exists
+        if not os.path.isfile(args.configfile):
+            raise ArgumentException(argument=args.configfile, message="Config File does not exist")
+            
+        self.CONFIGFILE = args.configfile
+        self.DUMPFILE = args.dumpfile
+        self.DRYRUN = args.dryrun
+        self.CLEAN_KNOWN_DEVICES = args.clean_known_devices
+
+