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#!/usr/bin/env python3
# -*- mode: python, coding: utf-8 -*-
'''
sysrss – Let your system generate a maintenance notification RSS
Copyright © 2012 Mattias Andrée (maandree@kth.se)
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 <http://www.gnu.org/licenses/>.
'''
import os
import sys
import datetime
from subprocess import Popen, PIPE
'''
Hack to enforce UTF-8 in output (in the future, if you see anypony not using utf-8 in
programs by default, report them to Princess Celestia so she can banish them to the moon)
@param text:str The text to print (empty string is default)
@param end:str The appendix to the text to print (line breaking is default)
'''
def print(text = '', end = '\n'):
sys.stdout.buffer.write((str(text) + end).encode('utf-8'))
sys.stdout.buffer.flush()
'''
stderr equivalent to print()
@param text:str The text to print (empty string is default)
@param end:str The appendix to the text to print (line breaking is default)
'''
def printerr(text = '', end = '\n'):
sys.stderr.buffer.write((str(text) + end).encode('utf-8'))
sys.stderr.buffer.flush()
'''
Link {@link #print}, only better because this does not take a text ending
but takes a format and parameters
@param master:str Formated string
@param slave:str* Parameters for the formated string
'''
def printf(master, *slave):
sys.stdout.buffer.write((master % slave).encode('utf-8'))
'''
Flush stdout
'''
def flush():
sys.stdout.buffer.flush()
'''
Mane class
@dependency util-linux::uuidgen
'''
class SysRSS:
'''
Mane method and constructor
'''
def __init__(self):
self.root = os.getenv('HOME') + '/.sysrss/'
self.sysinit()
'''
Initialise the system
'''
def sysinit(self):
if not os.path.isdir(self.root):
os.mkdir(self.root)
printf('Created root directory, %s.\n', self.root)
if not os.path.isfile(self.root + 'log'):
with open(self.root + 'log', 'wb') as file:
file.flush()
printf('Created log file, %s, it contains ever thing that have ever happend, ever.\n', self.root + 'log')
flush()
if not os.path.isfile(self.root + 'maintenance.rss'):
date = self.getTime()
with open(self.root + 'maintenance.rss', 'wb') as file:
file.write('<?xml version="1.0" encoding="utf-8"?>\n'.encode('utf-8'))
file.write('<rss version="2.0">\n'.encode('utf-8'))
file.write(' <channel>\n'.encode('utf-8'))
file.write(' <title>SysRSS</title>\n'.encode('utf-8'))
file.write(' <description>System maintenance notification RSS</description>\n'.encode('utf-8'))
file.write(' <link>http://localhost/</link>\n'.encode('utf-8'))
file.write((' <lastBuildDate>%s</lastBuildDate>\n' % date).encode('utf-8'))
file.write((' <pubDate>%s</pubDate>\n' % date).encode('utf-8'))
file.write(' <ttl>1800</ttl>\n'.encode('utf-8'))
file.write('\n'.encode('utf-8'))
file.write(' </channel>\n'.encode('utf-8'))
file.write('</rss>\n'.encode('utf-8'))
file.write('\n'.encode('utf-8'))
file.flush()
printf('Created rss file %s, your should set you news feed aggregator to syndicate this file.\n', self.root + 'maintenance.rss')
flush()
self.pubdate = date
self.publish('Welcome to SysRSS', 'This is going to be so awesome! 😄 \n\nEx animo\nSysRSS\n\n')
else:
data = None
with open(self.root + 'maintenance.rss', 'rb') as file:
data = file.read()
data = data.decode('utf8', 'replace')
data = data[data.find('<pubDate>') + len('<pubDate>'):]
data = data[:data.find('</')]
self.pubdate = data
'''
Publish a news item to the RSS
@param system:str The subsystem that generated the message
@param message:str Message to display
'''
def publish(self, system, message):
date = self.getTime()
addendum = self.makeNews(system, message).encode('utf-8')
with open(self.root + 'log', 'ab') as file:
file.write(addendum)
file.flush()
printf('The feed log as been updated with %s.\n', system)
with open(self.root + 'tmp', 'wb') as file:
file.write('<?xml version="1.0" encoding="utf-8"?>\n'.encode('utf-8'))
file.write('<rss version="2.0">\n'.encode('utf-8'))
file.write(' <channel>\n'.encode('utf-8'))
file.write(' <title>SysRSS</title>\n'.encode('utf-8'))
file.write(' <description>System maintenance notification RSS</description>\n'.encode('utf-8'))
file.write(' <link>http://localhost/</link>\n'.encode('utf-8'))
file.write((' <lastBuildDate>%s</lastBuildDate>\n' % date).encode('utf-8'))
file.write((' <pubDate>%s</pubDate>\n' % self.pubdate).encode('utf-8'))
with open(self.root + 'log', 'rb') as logfile:
file.write(logfile.read())
file.write(' </channel>\n'.encode('utf-8'))
file.write('</rss>\n'.encode('utf-8'))
file.write('\n'.encode('utf-8'))
file.flush()
Popen(['mv', self.root + 'tmp', self.root + 'maintenance.rss']).wait()
printf('The feed as been updated with %s.\n', system)
'''
Generate RSS item
@param system:str The subsystem that generated the message
@param message:str Message to display
@return :str RSS item
'''
def makeNews(self, system, message):
def makeUglyButReadable(data):
data = data.replace(']]>', ']]>]]<![CDATA[>')
data = data.replace('\n', '<br>') # [sic!]
return '<![CDATA[' + data + ']]>'
return('<item>\n <title>%s</title>\n <guid>%s</guid>\n <pubDate>%s</pubDate>\n <description>%s</description>\n</item>\n\n' %
(makeUglyButReadable(system), self.generateUUID(), self.getTime(), makeUglyButReadable(message)))
'''
Generate an UUID
@return An UUID
'''
def generateUUID(self):
uuid = Popen(['uuidgen'], stdout=PIPE).communicate()[0].decode('utf-8', 'replace')
if uuid[-1] == '\n':
uuid = uuid[:-1]
return uuid
'''
Get a locale independent time stamp in RSS's [poor] format
@return :str The current time
'''
def getTime(self):
time = datetime.datetime.utcnow().strftime('(%w), %d [%m] %Y %H:%M:%S +0000')
time = time.replace('(1)', 'Mon')
time = time.replace('(2)', 'Tue')
time = time.replace('(3)', 'Wed')
time = time.replace('(4)', 'Thu')
time = time.replace('(5)', 'Fri')
time = time.replace('(6)', 'Sat')
time = time.replace('(0)', 'Sun') # [sic!]
time = time.replace('[01]', 'Jan')
time = time.replace('[02]', 'Feb')
time = time.replace('[03]', 'Mar')
time = time.replace('[04]', 'Apr')
time = time.replace('[05]', 'May')
time = time.replace('[06]', 'Jun')
time = time.replace('[07]', 'Jul')
time = time.replace('[08]', 'Aug')
time = time.replace('[09]', 'Sep')
time = time.replace('[10]', 'Oct')
time = time.replace('[11]', 'Nov')
time = time.replace('[12]', 'Dec')
return time
'''
Execute mane method if started using this file
'''
if __name__ == '__main__':
SysRSS()
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