Onionr/onionr/logger.py

'''
    Onionr - P2P Microblogging Platform & Social network

    This file handles all operations involving logging
'''
'''
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    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 <https://www.gnu.org/licenses/>.
'''

import re, sys

class colors:
    '''
        This class allows you to set the color if ANSI codes are supported
    '''
    reset='\033[0m'
    bold='\033[01m'
    disable='\033[02m'
    underline='\033[04m'
    reverse='\033[07m'
    strikethrough='\033[09m'
    invisible='\033[08m'
    italics='\033[3m'
    class fg:
        black='\033[30m'
        red='\033[31m'
        green='\033[32m'
        orange='\033[33m'
        blue='\033[34m'
        purple='\033[35m'
        cyan='\033[36m'
        lightgrey='\033[37m'
        darkgrey='\033[90m'
        lightred='\033[91m'
        lightgreen='\033[92m'
        yellow='\033[93m'
        lightblue='\033[94m'
        pink='\033[95m'
        lightcyan='\033[96m'
    class bg:
        black='\033[40m'
        red='\033[41m'
        green='\033[42m'
        orange='\033[43m'
        blue='\033[44m'
        purple='\033[45m'
        cyan='\033[46m'
        lightgrey='\033[47m'
    @staticmethod
    def filter(data):
        return re.compile(r'\x1B\[[0-?]*[ -/]*[@-~]').sub('', str(data))

'''
    Use the bitwise operators to merge these settings
'''
USE_ANSI = 0b100
OUTPUT_TO_CONSOLE = 0b010
OUTPUT_TO_FILE = 0b001

LEVEL_DEBUG = 1
LEVEL_INFO = 2
LEVEL_WARN = 3
LEVEL_ERROR = 4
LEVEL_FATAL = 5

_type = OUTPUT_TO_CONSOLE | USE_ANSI # the default settings for logging
_level = LEVEL_DEBUG # the lowest level to log
_outputfile = './output.log' # the file to log to

'''
    Set the settings for the logger using bitwise operators
'''
def set_settings(type):
    global _type
    _type = type

'''
    Get settings from the logger
'''
def get_settings():
    return _type

'''
    Set the lowest log level to output
'''
def set_level(level):
    global _level
    _level = level

'''
    Get the lowest log level currently being outputted
'''
def get_level():
    return _level

'''
    Outputs raw data to console without formatting
'''
def raw(data):
    if get_settings() & OUTPUT_TO_CONSOLE:
        print(data)
    if get_settings() & OUTPUT_TO_FILE:
        with open(_outputfile, "a+") as f:
            f.write(colors.filter(data) + '\n')

'''
    Logs the data
    prefix : The prefix to the output
    data   : The actual data to output
    color  : The color to output before the data
'''
def log(prefix, data, color = ''):
    output = colors.reset + str(color) + '[' + colors.bold + str(prefix) + colors.reset + str(color) + '] ' + str(data) + colors.reset
    if not get_settings() & USE_ANSI:
        output = colors.filter(output)

    raw(output)

'''
    Takes in input from the console, not stored in logs
    message: The message to display before taking input
'''
def readline(message = 'Enter input: '):
    color = colors.fg.green + colors.bold
    output = colors.reset + str(color) + '... ' + colors.reset + str(message) + colors.reset

    if not get_settings() & USE_ANSI:
        output = colors.filter(output)

    sys.stdout.write(output)

    return input()

'''
    Displays an "Are you sure" message, returns True for Y and False for N
    message: The confirmation message, use %s for (y/n)
    default: which to prefer-- y or n
'''
def confirm(default = 'y', message = 'Are you sure %s? '):
    color = colors.fg.green + colors.bold

    default = default.lower()
    confirm = colors.bold
    if default.startswith('y'):
        confirm += '(Y/n)'
    else:
        confirm += '(y/N)'
    confirm += colors.reset + color

    output = colors.reset + str(color) + '... ' + colors.reset + str(message) + colors.reset

    if not get_settings() & USE_ANSI:
        output = colors.filter(output)

    sys.stdout.write(output.replace('%s', confirm))

    inp = input().lower()

    if 'y' in inp:
        return True
    if 'n' in inp:
        return False
    else:
        return default == 'y'

# debug: when there is info that could be useful for debugging purposes only
def debug(data):
    if get_level() <= LEVEL_DEBUG:
        log('/', data)

# info: when there is something to notify the user of, such as the success of a process
def info(data):
    if get_level() <= LEVEL_INFO:
        log('+', data, colors.fg.green)

# warn: when there is a potential for something bad to happen
def warn(data):
    if get_level() <= LEVEL_WARN:
        log('!', data, colors.fg.orange)

# error: when only one function, module, or process of the program encountered a problem and must stop
def error(data):
    if get_level() <= LEVEL_ERROR:
        log('-', data, colors.fg.red)

# fatal: when the something so bad has happened that the prorgam must stop
def fatal(data):
    if get_level() <= LEVEL_FATAL:
        log('#', data, colors.bg.red + colors.fg.green + colors.bold)