feat(logger): implement `stream_only` to use StreamHandler instead of RotatingFileHandler (#16274)

* feat: implement valued parameter 'stream_only' in 'get_logger()' in order to stream logs into stderr instead rotating log files.

Co-authored-by: gavin <gavin18d@gmail.com>

frappe/utils/logger.py

@@ -13,7 +13,7 @@ from frappe.utils import get_sites
 default_log_level = logging.DEBUG
 
 
-def get_logger(module=None, with_more_info=False, allow_site=True, filter=None, max_size=100_000, file_count=20):
+def get_logger(module=None, with_more_info=False, allow_site=True, filter=None, max_size=100_000, file_count=20, stream_only=False):
 	"""Application Logger for your given module
 
 	Args:
@@ -23,6 +23,7 @@ def get_logger(module=None, with_more_info=False, allow_site=True, filter=None,
 		filter (function, optional): Add a filter function for your logger. Defaults to None.
 		max_size (int, optional): Max file size of each log file in bytes. Defaults to 100_000.
 		file_count (int, optional): Max count of log files to be retained via Log Rotation. Defaults to 20.
+        stream_only (bool, optional): Whether to stream logs only to stderr (True) or use log files (False). Defaults to False.
 
 	Returns:
 		<class 'logging.Logger'>: Returns a Python logger object with Site and Bench level logging capabilities.
@@ -54,11 +55,14 @@ def get_logger(module=None, with_more_info=False, allow_site=True, filter=None,
 	logger.propagate = False
 
 	formatter = logging.Formatter("%(asctime)s %(levelname)s {0} %(message)s".format(module))
-	handler = RotatingFileHandler(log_filename, maxBytes=max_size, backupCount=file_count)
+	if stream_only:
+		handler = logging.StreamHandler()
+	else:
+		handler = RotatingFileHandler(log_filename, maxBytes=max_size, backupCount=file_count)
 	handler.setFormatter(formatter)
 	logger.addHandler(handler)
 
-	if site:
+	if site and not stream_only:
 		sitelog_filename = os.path.join(site, "logs", logfile)
 		site_handler = RotatingFileHandler(sitelog_filename, maxBytes=max_size, backupCount=file_count)
 		site_handler.setFormatter(formatter)