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import socket
import os
import sys
__version__ = "0.3.2"
# Byte conversion utility for compatibility between
# Python 2 and 3.
# http://python3porting.com/problems.html#nicer-solutions
if sys.version_info < (3,):
def _b(x):
return x
else:
import codecs
def _b(x):
return codecs.latin_1_encode(x)[0]
class SystemdNotifier:
"""This class holds a connection to the systemd notification socket
and can be used to send messages to systemd using its notify method."""
def __init__(self, debug=False):
"""Instantiate a new notifier object. This will initiate a connection
to the systemd notification socket.
Normally this method silently ignores exceptions (for example, if the
systemd notification socket is not available) to allow applications to
function on non-systemd based systems. However, setting debug=True will
cause this method to raise any exceptions generated to the caller, to
aid in debugging.
"""
self.debug = debug
try:
self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
addr = os.getenv('NOTIFY_SOCKET')
if addr[0] == '@':
addr = '\0' + addr[1:]
self.socket.connect(addr)
except:
self.socket = None
if self.debug:
raise
def notify(self, state):
"""Send a notification to systemd. state is a string; see
the man page of sd_notify (http://www.freedesktop.org/software/systemd/man/sd_notify.html)
for a description of the allowable values.
Normally this method silently ignores exceptions (for example, if the
systemd notification socket is not available) to allow applications to
function on non-systemd based systems. However, setting debug=True will
cause this method to raise any exceptions generated to the caller, to
aid in debugging."""
try:
self.socket.sendall(_b(state))
except:
if self.debug:
raise