Limnoria/src/log.py

#!/usr/bin/env python

###
# Copyright (c) 2002-2004, Jeremiah Fincher
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# modification, are permitted provided that the following conditions are met:
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#     this list of conditions, and the following disclaimer.
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#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
#
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###

__revision__ = "$Id$"

import supybot.fix as fix

import os
import sys
import time
import types
import atexit
import logging
import operator
import textwrap
import traceback

import supybot.ansi as ansi
import supybot.conf as conf
import supybot.utils as utils
import supybot.registry as registry

import supybot.ircutils as ircutils

deadlyExceptions = [KeyboardInterrupt, SystemExit]

class Formatter(logging.Formatter):
    def formatTime(self, record, datefmt=None):
        return timestamp(record.created)

    def formatException(self, (E, e, tb)):
        for exn in deadlyExceptions:
            if issubclass(e.__class__, exn):
                raise
        return logging.Formatter.formatException(self, (E, e, tb))


class Logger(logging.Logger):
    def exception(self, *args):
        (E, e, tb) = sys.exc_info()
        tbinfo = traceback.extract_tb(tb)
        path = '[%s]' % '|'.join(map(operator.itemgetter(2), tbinfo))
        eStrId = '%s:%s' % (E, path)
        eId = hex(hash(eStrId) & 0xFFFFF)
        logging.Logger.exception(self, *args)
        self.error('Exception id: %s', eId)
        # The traceback should be sufficient if we want it.
        # self.error('Exception string: %s', eStrId)


class StdoutStreamHandler(logging.StreamHandler):
    def disable(self):
        self.setLevel(sys.maxint) # Just in case.
        _logger.removeHandler(self)
        logging._acquireLock()
        try:
            del logging._handlers[self]
        finally:
            logging._releaseLock()

    def format(self, record):
        s = logging.StreamHandler.format(self, record)
        if record.levelname != 'ERROR' and conf.supybot.log.stdout.wrap():
            # We check for ERROR there because otherwise, tracebacks (which are
            # already wrapped by Python itself) wrap oddly.
            prefixLen = len(record.name) + 2 # ": "
            s = textwrap.fill(s, width=78, subsequent_indent=' '*prefixLen)
            s.rstrip('\r\n')
        return s

    def emit(self, record):
        if conf.supybot.log.stdout() and not conf.daemonized:
            try:
                logging.StreamHandler.emit(self, record)
            except ValueError, e: # Raised if sys.stdout is closed.
                self.disable()
                error('Error logging to stdout.  Removing stdout handler.')
                exception('Uncaught exception in StdoutStreamHandler:')


class BetterFileHandler(logging.FileHandler):
    def emit(self, record):
        msg = self.format(record)
        if not hasattr(types, "UnicodeType"): #if no unicode support...
            self.stream.write("%s\n" % msg)
        else:
            try:
                self.stream.write("%s\n" % msg)
            except UnicodeError:
                self.stream.write("%s\n" % msg.encode("UTF-8"))
        self.flush()


class ColorizedFormatter(Formatter):
    def formatException(self, (E, e, tb)):
        if conf.supybot.log.stdout.colorized():
            return ''.join([ansi.RED,
                            Formatter.formatException(self, (E, e, tb)),
                            ansi.RESET])
        else:
            return Formatter.formatException(self, (E, e, tb))

    def format(self, record, *args, **kwargs):
        if conf.supybot.log.stdout.colorized():
            color = ''
            if record.levelno == logging.CRITICAL:
                color = ansi.WHITE + ansi.BOLD
            elif record.levelno == logging.ERROR:
                color = ansi.RED
            elif record.levelno == logging.WARNING:
                color = ansi.YELLOW
            if color:
                return ''.join([color,
                                Formatter.format(self, record, *args, **kwargs),
                                ansi.RESET])
            else:
                return Formatter.format(self, record, *args, **kwargs)
        else:
            return Formatter.format(self, record, *args, **kwargs)

# These are public.
formatter = Formatter('%(levelname)s %(asctime)s %(message)s')
pluginFormatter = Formatter('%(levelname)s %(asctime)s %(name)s %(message)s')

# These are not.
logging.setLoggerClass(Logger)
_logger = logging.getLogger('supybot')

# These just make things easier.
debug = _logger.debug
info = _logger.info
warning = _logger.warning
error = _logger.error
critical = _logger.critical
exception = _logger.exception

def stat(*args):
    level = conf.supybot.log.statistics()
    _logger.log(level, *args)
    
setLevel = _logger.setLevel

atexit.register(logging.shutdown)

# ircutils will work without this, but it's useful.
ircutils.debug = debug

def getPluginLogger(name):
    if not conf.supybot.log.individualPluginLogfiles():
        return _logger
    log = logging.getLogger('supybot.plugins.%s' % name)
    if not log.handlers:
        filename = os.path.join(pluginLogDir, '%s.log' % name)
        handler = BetterFileHandler(filename)
        handler.setLevel(-1)
        handler.setFormatter(pluginFormatter)
        log.addHandler(handler)
    if name in sys.modules:
        # Let's log the version, this might be useful.
        module = sys.modules[name]
        try:
            if hasattr(module, '__revision__'):
                version = module.__revision__.split()[2]
                log.info('Starting log for %s (revision %s)', name, version)
            else:
                debug('Module %s has no __revision__ string.', name)
                log.info('Starting log for %s.', name)
        except IndexError:
            log.debug('Improper __revision__ string in %s.', name)
            log.info('Starting log for %s.', name)
    return log

def timestamp(when=None):
    if when is None:
        when = time.time()
    format = conf.supybot.log.timestampFormat()
    t = time.localtime(when)
    if format:
        return time.strftime(format, t)
    else:
        return str(int(time.mktime(t)))

def firewall(f, errorHandler=None):
    def logException(self, s=None):
        if s is None:
            s = 'Uncaught exception'
        if hasattr(self, 'log'):
            self.log.exception('%s:', s)
        else:
            exception('%s in %s.%s:', s, self.__class__.__name__, f.func_name)
    def m(self, *args, **kwargs):
        try:
            return f(self, *args, **kwargs)
        except Exception, e:
            logException(self)
            if errorHandler is not None:
                try:
                    errorHandler(self, *args, **kwargs)
                except Exception, e:
                    logException(self, 'Uncaught exception in errorHandler')

    m = utils.changeFunctionName(m, f.func_name, f.__doc__)
    return m

class MetaFirewall(type):
    def __new__(cls, name, bases, dict):
        firewalled = {}
        for base in bases:
            if hasattr(base, '__firewalled__'):
                firewalled.update(base.__firewalled__)
        if '__firewalled__' in dict:
            firewalled.update(dict['__firewalled__'])
        for attr in firewalled:
            if attr in dict:
                try:
                    errorHandler = firewalled[attr]
                except:
                    errorHandler = None
                dict[attr] = firewall(dict[attr], errorHandler)
        return type.__new__(cls, name, bases, dict)


class ValidLogLevel(registry.String):
    """Invalid log level."""
    minimumLevel = -1
    def set(self, s):
        s = s.upper()
        try:
            level = getattr(logging, s)
        except AttributeError:
            try:
                level = int(s)
            except ValueError:
                self.error()
        if level < self.minimumLevel:
            self.error()
        self.setValue(level)

    def __str__(self):
        level = logging.getLevelName(self.value)
        if level.startswith('Level'):
            level = level.split()[-1]
        return level

class LogLevel(ValidLogLevel):
    """Invalid log level.  Value must be either DEBUG, INFO, WARNING, ERROR,
    or CRITICAL."""
    def setValue(self, v):
        ValidLogLevel.setValue(self, v)
        _logger.setLevel(self.value) # _logger defined later.

conf.registerGlobalValue(conf.supybot.directories, 'log',
    registry.String('logs', """Determines what directory the bot will store its
    logfiles in."""))

conf.registerGroup(conf.supybot, 'log')
conf.registerGlobalValue(conf.supybot.log, 'level',
    LogLevel(logging.INFO, """Determines what the minimum priority level logged
    will be.  Valid values are DEBUG, INFO, WARNING, ERROR, and CRITICAL, in
    order of increasing priority."""))
conf.registerGlobalValue(conf.supybot.log, 'statistics',
    ValidLogLevel(logging.DEBUG, """Determines what level statistics reporting
    is to be logged at.  Mostly, this just includes, for instance, the time it
    took to parse a message, process a command, etc.  You probably don't care
    about this."""))
conf.registerGlobalValue(conf.supybot.log, 'stdout',
    registry.Boolean(True, """Determines whether the bot will log to
    stdout."""))
conf.registerGlobalValue(conf.supybot.log, 'individualPluginLogfiles',
    registry.Boolean(False, """Determines whether the bot will separate plugin
    logs into their own individual logfiles."""))

class BooleanRequiredFalseOnWindows(registry.Boolean):
    def set(self, s):
        registry.Boolean.set(self, s)
        if self.value and os.name == 'nt':
            raise InvalidRegistryValue, 'Value cannot be true on Windows.'

conf.registerGlobalValue(conf.supybot.log.stdout, 'colorized',
    BooleanRequiredFalseOnWindows(False, """Determines whether the bot's logs
    to stdout (if enabled) will be colorized with ANSI color."""))

conf.registerGlobalValue(conf.supybot.log.stdout, 'wrap',
    registry.Boolean(True, """Determines whether the bot will wrap its logs
    when they're output to stdout."""))

conf.registerGlobalValue(conf.supybot.log, 'timestampFormat',
    registry.String('[%d-%b-%Y %H:%M:%S]', """Determines the format string for
    timestamps in logfiles.  Refer to the Python documentation for the time
    module to see what formats are accepted. If you set this variable to the
    empty string, times will be logged in a simple seconds-since-epoch
    format."""))

_logDir = conf.supybot.directories.log()
if not os.path.exists(_logDir):
    os.mkdir(_logDir, 0755)

pluginLogDir = os.path.join(_logDir, 'plugins')

if not os.path.exists(pluginLogDir):
    os.mkdir(pluginLogDir, 0755)

_handler = BetterFileHandler(os.path.join(_logDir, 'misc.log'))
_handler.setFormatter(formatter)
_handler.setLevel(-1)
_logger.addHandler(_handler)
_logger.setLevel(conf.supybot.log.level())

if not conf.daemonized:
    _stdoutHandler = StdoutStreamHandler(sys.stdout)
    _formatString = '%(name)s: %(levelname)s %(message)s'
    _stdoutFormatter = ColorizedFormatter(_formatString)
    _stdoutHandler.setFormatter(_stdoutFormatter)
    _stdoutHandler.setLevel(-1)
    _logger.addHandler(_stdoutHandler)


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