Feature/initial (#1)

* initial commit
* systemd service implementation

EHSExceptions.py

@@ -0,0 +1,64 @@
+class EHSException(Exception):
+    """Base class for exceptions in this module."""
+    pass
+
+class MessageWarningException(EHSException):
+    """Exception raised by message errors.
+
+    Attributes:
+        message -- explanation of the error
+    """
+
+    def __init__(self, argument, message):
+        self.argument = argument
+        self.message = message
+        super().__init__(self.message)
+
+    def __str__(self):
+        return f'{self.message}: {self.argument}'
+
+class ConfigException(EHSException):
+    """Exception raised by multiple Config errors.
+
+    Attributes:
+        message -- explanation of the error
+    """
+
+    def __init__(self, argument, message="Config Parameter Exception: "):
+        self.argument = argument
+        self.message = message
+        super().__init__(self.message)
+
+    def __str__(self):
+        return f'{self.message}: {self.argument}'
+    
+class ArgumentException(EHSException):
+    """Exception raised by multiple Arguments errors.
+
+    Attributes:
+        message -- explanation of the error
+    """
+
+    def __init__(self, argument, message="Argument is missing"):
+        self.argument = argument
+        self.message = message
+        super().__init__(self.message)
+
+    def __str__(self):
+        return f'{self.argument} -> {self.message}'
+
+class InvalidMessageTypeException(EHSException):
+    """Exception raised for invalid message types.
+
+    Attributes:
+        message_type -- input message type which caused the error
+        message -- explanation of the error
+    """
+
+    def __init__(self, message_type, message="Invalid message type provided"):
+        self.message_type = message_type
+        self.message = message
+        super().__init__(self.message)
+
+    def __str__(self):
+        return f'{self.message_type} -> {self.message}'