--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/velib_python/logger.py	Sun Dec 05 14:35:36 2021 +1030
@@ -0,0 +1,41 @@
+#!/usr/bin/python3 -u
+# -*- coding: utf-8 -*-
+
+import logging
+import sys
+
+class LevelFilter(logging.Filter):
+	def __init__(self, passlevels, reject):
+		self.passlevels = passlevels
+		self.reject = reject
+
+	def filter(self, record):
+		if self.reject:
+			return (record.levelno not in self.passlevels)
+		else:
+			return (record.levelno in self.passlevels)
+
+# Leave the name set to None to get the root logger. For some reason specifying 'root' has a
+# different effect: there will be two root loggers, both with their own handlers...
+def setup_logging(debug=False, name=None):
+	formatter = logging.Formatter(fmt='%(levelname)s:%(module)s:%(message)s')
+
+	# Make info and debug stream to stdout and the rest to stderr
+	h1 = logging.StreamHandler(sys.stdout)
+	h1.addFilter(LevelFilter([logging.INFO, logging.DEBUG], False))
+	h1.setFormatter(formatter)
+
+	h2 = logging.StreamHandler(sys.stderr)
+	h2.addFilter(LevelFilter([logging.INFO, logging.DEBUG], True))
+	h2.setFormatter(formatter)
+
+	logger = logging.getLogger(name)
+	logger.addHandler(h1)
+	logger.addHandler(h2)
+
+	# Set the loglevel and show it
+	logger.setLevel(level=(logging.DEBUG if debug else logging.INFO))
+	logLevel = {0: 'NOTSET', 10: 'DEBUG', 20: 'INFO', 30: 'WARNING', 40: 'ERROR'}
+	logger.info('Loglevel set to ' + logLevel[logger.getEffectiveLevel()])
+
+	return logger