improve logging a bit

domain/BackupRotator.py

@@ -28,10 +28,22 @@ import yaml
 
 class BackupRotator:
 	
-	def __init__(self, debug:bool = False):
+	def __init__(
+			self,
+			debug: bool = False,
+			systemd: bool = False,
+			write_to_syslog: bool = False
+	):
 		
-		self.__logger = Logger(name=type(self).__name__, debug=debug)
-		self.__config_helper = Config(logger=self.__logger)
+		self.__logger = Logger(
+			name=type(self).__name__,
+			debug=debug,
+			systemd=systemd,
+			write_to_syslog=write_to_syslog,
+		)
+		self.__config_helper = Config(
+			logger=self.__logger
+		)
 		
 		self.__dry_run = False
 		self.__configs = []

domain/Logger.py

@@ -7,13 +7,26 @@ import sys
 
 class Logger:
 
-	def __init__(self, name: str, debug: bool = False):
+	def __init__(
+			self,
+			name: str,
+			debug: bool = False,
+			write_to_syslog: bool = False,
+			systemd: bool = False
+	):
 		
 		self.__name = name
+		self.__debug = debug
+		self.__write_to_syslog = write_to_syslog
+		self.__systemd = systemd
+		
+		self._init_logger()
+		
+	def _init_logger(self):
 		
 		self.__logger = logging.getLogger(self.__name)
-
-		if debug:
+		
+		if self.__debug:
 			level = logging.DEBUG
 		else:
 			level = logging.INFO
@@ -35,7 +48,9 @@ class Logger:
 		)
 		handler.setLevel(level)
 		handler.addFilter(lambda entry: entry.levelno <= logging.INFO)
-		handler.setFormatter(formatter_full)
+		handler.setFormatter(
+			formatter if self.__systemd else formatter_full
+		)
 		self.__logger.addHandler(handler)
 		
 		# Console output / stream handler (STDERR)
@@ -43,16 +58,19 @@ class Logger:
 			stream=sys.stderr
 		)
 		handler.setLevel(logging.WARNING)
-		handler.setFormatter(formatter_full)
+		handler.setFormatter(
+			formatter if self.__systemd else formatter_full
+		)
 		self.__logger.addHandler(handler)
 		
 		# Syslog handler
-		handler = SysLogHandler(
-			address="/dev/log"
-		)
-		handler.setLevel(level)
-		handler.setFormatter(formatter)
-		self.__logger.addHandler(handler)
+		if self.__write_to_syslog:
+			handler = SysLogHandler(
+				address="/dev/log"
+			)
+			handler.setLevel(level)
+			handler.setFormatter(formatter)
+			self.__logger.addHandler(handler)
 		
 		# This is annoying inside cron
 		self.debug("Test debug log")

main.py

@@ -21,6 +21,27 @@ def main():
 		help="Verbose/Debug logging mode"
 	)
 	
+	parser.add_argument(
+		"--systemd",
+		default=False,
+		dest="systemd",
+		action="store_true",
+		help=(
+			"Pass if this program will be spawned inside systemd"
+			" or another system that already adds timestamps to log messages."
+		)
+	)
+	
+	parser.add_argument(
+		"--syslog", "--write-to-syslog",
+		default=False,
+		dest="write_to_syslog",
+		action="store_true",
+		help=(
+			"Pass if you'd like this program to write to syslog."
+		)
+	)
+	
 	parser.add_argument(
 		"--config", "-c",
 		dest="config_files",
@@ -40,7 +61,9 @@ def main():
 	args = parser.parse_args()
 	
 	rotator = BackupRotator(
-		debug=args.debug
+		debug=args.debug,
+		systemd=args.systemd,
+		write_to_syslog=args.write_to_syslog,
 	)
 	rotator.run(
 		configs=args.config_files,