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# -*- coding: utf-8 -*-
# leap_log_handler.py
# Copyright (C) 2013 LEAP
#
# 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/>.
"""
Custom handler for the logger window.
"""
import logging
from PySide import QtCore
class LogHandler(logging.Handler):
"""
This is the custom handler that implements our desired formatting
and also keeps a history of all the logged events.
"""
MESSAGE_KEY = 'message'
RECORD_KEY = 'record'
def __init__(self, qtsignal):
"""
LogHander initialization.
Calls parent method and keeps a reference to the qtsignal
that will be used to fire the gui update.
"""
# TODO This is going to eat lots of memory after some time.
# Should be pruned at some moment.
self._log_history = []
logging.Handler.__init__(self)
self._qtsignal = qtsignal
def _get_format(self, logging_level):
"""
Sets the log format depending on the parameter.
It uses html and css to set the colors for the logs.
:param logging_level: the debug level to define the color.
:type logging_level: str.
"""
log_format = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
formatter = logging.Formatter(log_format)
return formatter
def emit(self, logRecord):
"""
This method is fired every time that a record is logged by the
logging module.
This method reimplements logging.Handler.emit that is fired
in every logged message.
:param logRecord: the record emitted by the logging module.
:type logRecord: logging.LogRecord.
"""
self.setFormatter(self._get_format(logRecord.levelname))
log = self.format(logRecord)
log_item = {self.RECORD_KEY: logRecord, self.MESSAGE_KEY: log}
self._log_history.append(log_item)
self._qtsignal(log_item)
class HandlerAdapter(object):
"""
New style class that accesses all attributes from the LogHandler.
Used as a workaround for a problem with multiple inheritance with Pyside
that surfaced under OSX with pyside 1.1.0.
"""
MESSAGE_KEY = 'message'
RECORD_KEY = 'record'
def __init__(self, qtsignal):
self._handler = LogHandler(qtsignal=qtsignal)
def setLevel(self, *args, **kwargs):
return self._handler.setLevel(*args, **kwargs)
def handle(self, *args, **kwargs):
return self._handler.handle(*args, **kwargs)
@property
def level(self):
return self._handler.level
class LeapLogHandler(QtCore.QObject, HandlerAdapter):
"""
Custom logging handler. It emits Qt signals so it can be plugged to a gui.
Its inner handler also stores an history of logs that can be fetched after
having been connected to a gui.
"""
# All dicts returned are of the form
# {'record': LogRecord, 'message': str}
new_log = QtCore.Signal(dict)
def __init__(self):
"""
LeapLogHandler initialization.
Initializes parent classes.
"""
QtCore.QObject.__init__(self)
HandlerAdapter.__init__(self, qtsignal=self.qtsignal)
def qtsignal(self, log_item):
# WARNING: the new-style connection does NOT work because PySide
# translates the emit method to self.emit, and that collides with
# the emit method for logging.Handler
# self.new_log.emit(log_item)
QtCore.QObject.emit(
self,
QtCore.SIGNAL('new_log(PyObject)'), log_item)
@property
def log_history(self):
"""
Returns the history of the logged messages.
"""
return self._handler._log_history
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