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"""Auxiliary functions used for logging module.
"""
# Copyright The Mbed TLS Contributors
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
#
import logging
import sys
def configure_logger(
logger: logging.Logger,
log_format="[%(levelname)s]: %(message)s",
split_level=logging.WARNING
) -> None:
"""
Configure the logging.Logger instance so that:
- Format is set to any log_format.
Default: "[%(levelname)s]: %(message)s"
- loglevel >= split_level are printed to stderr.
- loglevel < split_level are printed to stdout.
Default: logging.WARNING
"""
class MaxLevelFilter(logging.Filter):
# pylint: disable=too-few-public-methods
def __init__(self, max_level, name=''):
super().__init__(name)
self.max_level = max_level
def filter(self, record: logging.LogRecord) -> bool:
return record.levelno <= self.max_level
log_formatter = logging.Formatter(log_format)
# set loglevel >= split_level to be printed to stderr
stderr_hdlr = logging.StreamHandler(sys.stderr)
stderr_hdlr.setLevel(split_level)
stderr_hdlr.setFormatter(log_formatter)
# set loglevel < split_level to be printed to stdout
stdout_hdlr = logging.StreamHandler(sys.stdout)
stdout_hdlr.addFilter(MaxLevelFilter(split_level - 1))
stdout_hdlr.setFormatter(log_formatter)
logger.addHandler(stderr_hdlr)
logger.addHandler(stdout_hdlr)
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