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# -*- test-case-name: twisted.python.test.test_syslog -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Classes and utility functions for integrating Twisted and syslog.
You probably want to call L{startLogging}.
"""
syslog = __import__('syslog')
from twisted.python import log
from twisted.python._oldstyle import _oldStyle
# These defaults come from the Python syslog docs.
DEFAULT_OPTIONS = 0
DEFAULT_FACILITY = syslog.LOG_USER
@_oldStyle
class SyslogObserver:
"""
A log observer for logging to syslog.
See L{twisted.python.log} for context.
This logObserver will automatically use LOG_ALERT priority for logged
failures (such as from C{log.err()}), but you can use any priority and
facility by setting the 'C{syslogPriority}' and 'C{syslogFacility}' keys in
the event dict.
"""
openlog = syslog.openlog
syslog = syslog.syslog
def __init__(self, prefix, options=DEFAULT_OPTIONS,
facility=DEFAULT_FACILITY):
"""
@type prefix: C{str}
@param prefix: The syslog prefix to use.
@type options: C{int}
@param options: A bitvector represented as an integer of the syslog
options to use.
@type facility: C{int}
@param facility: An indication to the syslog daemon of what sort of
program this is (essentially, an additional arbitrary metadata
classification for messages sent to syslog by this observer).
"""
self.openlog(prefix, options, facility)
def emit(self, eventDict):
"""
Send a message event to the I{syslog}.
@param eventDict: The event to send. If it has no C{'message'} key, it
will be ignored. Otherwise, if it has C{'syslogPriority'} and/or
C{'syslogFacility'} keys, these will be used as the syslog priority
and facility. If it has no C{'syslogPriority'} key but a true
value for the C{'isError'} key, the B{LOG_ALERT} priority will be
used; if it has a false value for C{'isError'}, B{LOG_INFO} will be
used. If the C{'message'} key is multiline, each line will be sent
to the syslog separately.
"""
# Figure out what the message-text is.
text = log.textFromEventDict(eventDict)
if text is None:
return
# Figure out what syslog parameters we might need to use.
priority = syslog.LOG_INFO
facility = 0
if eventDict['isError']:
priority = syslog.LOG_ALERT
if 'syslogPriority' in eventDict:
priority = int(eventDict['syslogPriority'])
if 'syslogFacility' in eventDict:
facility = int(eventDict['syslogFacility'])
# Break the message up into lines and send them.
lines = text.split('\n')
while lines[-1:] == ['']:
lines.pop()
firstLine = True
for line in lines:
if firstLine:
firstLine = False
else:
line = '\t' + line
self.syslog(priority | facility,
'[%s] %s' % (eventDict['system'], line))
def startLogging(prefix='Twisted', options=DEFAULT_OPTIONS,
facility=DEFAULT_FACILITY, setStdout=1):
"""
Send all Twisted logging output to syslog from now on.
The prefix, options and facility arguments are passed to
C{syslog.openlog()}, see the Python syslog documentation for details. For
other parameters, see L{twisted.python.log.startLoggingWithObserver}.
"""
obs = SyslogObserver(prefix, options, facility)
log.startLoggingWithObserver(obs.emit, setStdout=setStdout)