pvc/node-daemon/pvcd/log.py

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#!/usr/bin/env python3
# log.py - Output (stdout + logfile) functions
# Part of the Parallel Virtual Cluster (PVC) system
#
# Copyright (C) 2018 Joshua M. Boniface <joshua@boniface.me>
#
# 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 datetime
class Logger(object):
# Define a logger class for a daemon instance
# Keeps record of where to log, and is passed messages which are
# formatted in various ways based off secondary characteristics.
# ANSII colours for output
fmt_red = '\033[91m'
fmt_blue = '\033[94m'
fmt_cyan = '\033[96m'
fmt_green = '\033[92m'
fmt_yellow = '\033[93m'
fmt_purple = '\033[95m'
fmt_bold = '\033[1m'
fmt_end = '\033[0m'
# Initialization of instance
def __init__(self, config):
self.config = config
if self.config['file_logging'] == 'True':
self.logfile = self.config['log_directory'] + '/pvc.log'
# We open the logfile for the duration of our session, but have a hup function
self.writer = open(self.logfile, 'a', buffering=1)
self.last_colour = self.fmt_cyan
else:
self.last_colour = ""
# Provide a hup function to close and reopen the writer
def hup(self):
self.writer.close()
self.writer = open(self.logfile, 'a', buffering=0)
# Output function
def out(self, message, state='', prefix=''):
# Get the date
date = '{} - '.format(datetime.datetime.now().strftime('%Y/%m/%d %H:%M:%S.%f'))
endc = Logger.fmt_end
# Determine the formatting
# OK
if state == 'o':
colour = Logger.fmt_green
prompt = '>>> '
# Error
elif state == 'e':
colour = Logger.fmt_red
prompt = '>>> '
# Warning
elif state == 'w':
colour = Logger.fmt_yellow
prompt = '>>> '
# Tick
elif state == 't':
colour = Logger.fmt_purple
prompt = '>>> '
# Information
elif state == 'i':
colour = Logger.fmt_blue
prompt = '>>> '
# Startup
elif state == 's':
colour = Logger.fmt_cyan
prompt = '>>> '
# Continuation
else:
date = ''
colour = self.last_colour
prompt = '>>> '
# Append space to prefix
if prefix != '':
prefix = prefix + ' - '
message = colour + prompt + endc + date + prefix + message
print(message)
if self.config['file_logging'] == 'True':
self.writer.write(message + '\n')
self.last_colour = colour