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# Copyright 2010-2011 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
"""Loggers."""
__metaclass__ = type
__all__ = [
'BufferLogger',
'DevNullLogger',
'FakeLogger',
'LaunchpadLogger',
'NullHandler',
'PrefixFilter',
]
import logging
from StringIO import StringIO
import sys
import traceback
from lp.services.log import loglevels
LEVEL_PREFIXES = dict(
(debug_level, "DEBUG%d" % (1 + debug_level - loglevels.DEBUG))
for debug_level in xrange(loglevels.DEBUG9, loglevels.DEBUG))
LEVEL_PREFIXES.update({
loglevels.DEBUG: 'DEBUG',
loglevels.INFO: 'INFO',
loglevels.WARNING: 'WARNING',
loglevels.ERROR: 'ERROR',
loglevels.CRITICAL: 'CRITICAL',
})
class LaunchpadLogger(logging.Logger):
"""Logger that support our custom levels."""
def debug1(self, msg, *args, **kwargs):
if self.isEnabledFor(loglevels.DEBUG1):
self._log(loglevels.DEBUG1, msg, args, **kwargs)
def debug2(self, msg, *args, **kwargs):
if self.isEnabledFor(loglevels.DEBUG2):
self._log(loglevels.DEBUG2, msg, args, **kwargs)
def debug3(self, msg, *args, **kwargs):
if self.isEnabledFor(loglevels.DEBUG3):
self._log(loglevels.DEBUG3, msg, args, **kwargs)
def debug4(self, msg, *args, **kwargs):
if self.isEnabledFor(loglevels.DEBUG4):
self._log(loglevels.DEBUG4, msg, args, **kwargs)
def debug5(self, msg, *args, **kwargs):
if self.isEnabledFor(loglevels.DEBUG5):
self._log(loglevels.DEBUG5, msg, args, **kwargs)
def debug6(self, msg, *args, **kwargs):
if self.isEnabledFor(loglevels.DEBUG6):
self._log(loglevels.DEBUG6, msg, args, **kwargs)
def debug7(self, msg, *args, **kwargs):
if self.isEnabledFor(loglevels.DEBUG7):
self._log(loglevels.DEBUG7, msg, args, **kwargs)
def debug8(self, msg, *args, **kwargs):
if self.isEnabledFor(loglevels.DEBUG8):
self._log(loglevels.DEBUG8, msg, args, **kwargs)
def debug9(self, msg, *args, **kwargs):
if self.isEnabledFor(loglevels.DEBUG9):
self._log(loglevels.DEBUG9, msg, args, **kwargs)
class PrefixFilter:
"""A logging Filter that inserts a prefix into messages.
If no static prefix is provided, the Logger's name is used.
"""
def __init__(self, prefix=None):
self.prefix = prefix
def filter(self, record):
prefix = self.prefix or record.name
record.msg = '[%s] %s' % (prefix, record.msg)
return True
class NullHandler(logging.Handler):
"""A do-nothing Handler used to silence 'No handlers for logger' warnings.
"""
def emit(self, record):
pass
class FakeLogger:
"""Emulates a proper logger, just printing everything out the given file.
"""
loglevel = loglevels.DEBUG
def __init__(self, output_file=None):
"""The default output_file is sys.stdout."""
self.output_file = output_file
def setLevel(self, loglevel):
self.loglevel = loglevel
def getEffectiveLevel(self):
return self.loglevel
def _format_message(self, msg, *args):
if not isinstance(msg, basestring):
msg = str(msg)
# To avoid type errors when the msg has % values and args is empty,
# don't expand the string with empty args.
if len(args) > 0:
msg %= args
return msg
def message(self, level, msg, *stuff, **kw):
if level < self.loglevel:
return
# We handle the default output file here because sys.stdout
# might have been reassigned. Between now and when this object
# was instantiated.
if self.output_file is None:
output_file = sys.stdout
else:
output_file = self.output_file
prefix = LEVEL_PREFIXES.get(level, "%d>" % level)
print >> output_file, prefix, self._format_message(msg, *stuff)
if 'exc_info' in kw:
traceback.print_exc(file=output_file)
def log(self, level, *stuff, **kw):
self.message(level, *stuff, **kw)
def warning(self, *stuff, **kw):
self.message(loglevels.WARNING, *stuff, **kw)
warn = warning
def error(self, *stuff, **kw):
self.message(loglevels.ERROR, *stuff, **kw)
exception = error
def critical(self, *stuff, **kw):
self.message(loglevels.CRITICAL, *stuff, **kw)
fatal = critical
def info(self, *stuff, **kw):
self.message(loglevels.INFO, *stuff, **kw)
def debug(self, *stuff, **kw):
self.message(loglevels.DEBUG, *stuff, **kw)
def debug2(self, *stuff, **kw):
self.message(loglevels.DEBUG2, *stuff, **kw)
def debug3(self, *stuff, **kw):
self.message(loglevels.DEBUG3, *stuff, **kw)
def debug4(self, *stuff, **kw):
self.message(loglevels.DEBUG4, *stuff, **kw)
def debug5(self, *stuff, **kw):
self.message(loglevels.DEBUG5, *stuff, **kw)
def debug6(self, *stuff, **kw):
self.message(loglevels.DEBUG6, *stuff, **kw)
def debug7(self, *stuff, **kw):
self.message(loglevels.DEBUG7, *stuff, **kw)
def debug8(self, *stuff, **kw):
self.message(loglevels.DEBUG8, *stuff, **kw)
def debug9(self, *stuff, **kw):
self.message(loglevels.DEBUG9, *stuff, **kw)
class DevNullLogger(FakeLogger):
"""A logger that drops all messages."""
def message(self, *args, **kwargs):
"""Do absolutely nothing."""
class BufferLogger(FakeLogger):
"""A logger that logs to a StringIO object."""
def __init__(self):
super(BufferLogger, self).__init__(StringIO())
def getLogBuffer(self):
"""Return the existing log messages."""
return self.output_file.getvalue()
def clearLogBuffer(self):
"""Clear out the existing log messages."""
self.output_file = StringIO()
def getLogBufferAndClear(self):
"""Return the existing log messages and clear the buffer."""
messages = self.getLogBuffer()
self.clearLogBuffer()
return messages
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