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#!/usr/bin/python3 

# -*- Mode:Python; indent-tabs-mode:nil; tab-width:4 -*- 

# 

# Copyright (C) 2015 Canonical Ltd 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License version 3 as 

# published by the Free Software Foundation. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the GNU General Public License 

# along with this program.  If not, see <http://www.gnu.org/licenses/>. 

 

import logging 

import io 

import os 

import sys 

 

 

_COLOR_BOLD = '\033[1m' 

_COLOR_END = '\033[0m' 

 

 

class _StdoutFilter(logging.Filter): 

 

    def filter(self, record): 

        return record.levelno <= logging.WARNING 

 

 

class _StderrFilter(logging.Filter): 

 

    def filter(self, record): 

        return record.levelno >= logging.ERROR 

 

 

def configure(logger_name=None): 

43    if not os.isatty(1) and not sys.stdout.line_buffering: 

        # Line buffering makes logs easier to handle. 

        sys.stdout.flush() 

        sys.stdout = io.TextIOWrapper( 

            sys.stdout.detach(), encoding='UTF-8', line_buffering=True) 

 

    stdout_handler = logging.StreamHandler(stream=sys.stdout) 

    stdout_handler.addFilter(_StdoutFilter()) 

    stderr_handler = logging.StreamHandler(stream=sys.stderr) 

    stderr_handler.addFilter(_StderrFilter()) 

    handlers = [stdout_handler, stderr_handler] 

 

    fmt = '{message}' 

56    if os.isatty(1): 

        fmt = _COLOR_BOLD + fmt + _COLOR_END 

    formatter = logging.Formatter(fmt, style='{') 

    logger = logging.getLogger(logger_name) 

    for handler in handlers: 

        handler.setFormatter(formatter) 

        logger.addHandler(handler) 

 

    logger.setLevel(logging.INFO)