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GNU GENERAL PUBLIC LICENSE
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may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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recursive-include pylg *.py
include LICENSE.txt

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PyLg
====
PyLg (read as py-log) is a python module that facilitates the process
of writing runtime logs. The goal of PyLg is to provide an unobtrusive
and flexible interface that automates the process of generating
informative logs.
Demo
----
.. image:: https://gitlab.wojciechkozlowski.eu/wojtek/PyLg/raw/pylg-dev/screenshots/demo.png
:target: https://gitlab.wojciechkozlowski.eu/wojtek/PyLg/raw/pylg-dev/screenshots/demo.png
Features
--------
- Ease of use - the API consists of only one decorator and one
function.
- Flexible - the user can set global preferences as well as on a
per-function basis.
- Informative - PyLg can automatically log input arguments, return
values and exceptions raised.
- User logs - the user can make additional logs that will be collected
together with the automatically generated logs.
Installation
------------
::
[sudo] pip install pylg --upgrade
Note that PyLg is under active development. Frequent upgrades are
recommended.
Usage
-----
Import the module:
::
from pylg import TraceFunction, trace
To automatically log function entry and exit use the
``@TraceFunction`` decorator:
::
@TraceFunction
def some_fuction():
pass
Despite the name, this works for both functions and methods.
``@TraceFunction`` can take up to two optional arguments:
- trace_args - if ``True``, input parameters will be logged.
- trace_rv - if ``True``, the return value will be logged.
The default values for these arguments are set in a global settings
file.
These arguments have to specified explicitly by name. Some examples:
::
@TraceFunction(trace_args = False)
def some_fuction():
pass
@TraceFunction(trace_rv = False)
def some_fuction():
pass
@TraceFunction(trace_args = False, trace_args = False)
def some_fuction():
pass
The other way to interact with PyLg is to log a user defined message
with the ``trace`` function.
::
trace("The user can pass any string they desire in here")
User Settings
-------------
The user can adjust several settings to suit their preferences. To do
so, create a file named ``pylg_settings.py`` in the top-level
directory and set any of the following variables to the desired values
in order to override the defaults. The settings.py file in the project
directory contains all the default settings and can be used as a
template.
- PYLG_ENABLE (default = True) - enable/disable logs.
- PYLG (default = 'pylg.log') - the log file name.
- CLASS_NAME_RESOLUTION (default = False) - PyLg can also log the
class name along with the method name if one exists. However, for
this to work correctly the ``trace`` function cannot be called from
functions that are not decorated by ``@TraceFunction`` which is why
it is disabled by default.
- DEFAULT_TRACE_ARGS (default = True) - the default value for
``trace_args`` argument which can be passed to the ``@TraceFunction`
decorator. If ``trace_args`` is ``True`` all parameters passed to
the function will be logged. This can be overriden on an individual
function basis.
- DEFAULT_TRACE_RV (default = True) - the default value for trace_rv
argument which can be passed to the ``@TraceFunction`` decorator. If
``trace_rv`` is ``True`` the function's return value will be
logged. This can be overriden on an individual function basis.
- EXCEPTION_WARNING (default = True) - PyLg catches all exceptions in
traced functions, logs them, and then re-raises them with the full
backtrace. This setting determines whether it should also produce a
warning for the user using the Python warning mechanism.
- FILENAME_COLUMN_WIDTH (default = 32) - the column width reserved for
the file name. Names that are too short will be padded with
whitespace and names that are too long will be truncated.
- FUNCTION_COLUMN_WIDTH (default = 32) - the column width reserved for
the function name. Names that are too short will be padded with
whitespace and names that are too long will be truncated.
Under development
-----------------
Since this module is under development, here are a few things to keep
in mind when using PyLg.
- The behaviour of ``@TraceFunction`` has not been tested when multiple
decorators are present.
- When PyLg opens a new log file, it overwrites any file present with
the same name. Therefore, it can erase important files if you are
not careful.
- Some features of PyLg do not work with old-style classes.
Contributing
------------
Please submit contributions branched from the ``pylg-dev`` branch.

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#-------------------------------------------------------------------------------
# PyLg: module to facilitate and automate the process of writing runtime logs.
# Copyright (C) 2017 Wojciech Kozlowski <wojciech.kozlowski@vivaldi.net>
#
# 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/>.
#-------------------------------------------------------------------------------
from .pylg import TraceFunction, trace

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#-------------------------------------------------------------------------------
# PyLg: module to facilitate and automate the process of writing runtime logs.
# Copyright (C) 2017 Wojciech Kozlowski <wojciech.kozlowski@vivaldi.net>
#
# 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/>.
#-------------------------------------------------------------------------------
from datetime import datetime
from functools import partial
import warnings
import inspect
import sys
import os
#-------------------------------------------------------------------------------
# Load default settings.
#-------------------------------------------------------------------------------
from .settings import *
try:
#---------------------------------------------------------------------------
# Load user settings.
#---------------------------------------------------------------------------
from pylg_settings import *
except ImportError:
#---------------------------------------------------------------------------
# User settings don't exist.
#---------------------------------------------------------------------------
pass
class ClassNameStack(object):
""" A class to keep a global stack of the class names of the
functions that are currently executing. The class name of the
last traced function that was called will be on top of the
stack. It is removed after it finishes executing.
"""
stack = []
@staticmethod
def insert(classname):
if CLASS_NAME_RESOLUTION:
ClassNameStack.stack.append(classname)
@staticmethod
def pop():
if CLASS_NAME_RESOLUTION and ClassNameStack.stack:
ClassNameStack.stack.pop()
@staticmethod
def get():
if CLASS_NAME_RESOLUTION and ClassNameStack.stack:
return ClassNameStack.stack[-1]
else:
return None
class PyLg(object):
""" Class to handle the log file.
"""
wfile = None
filename = PYLG
@staticmethod
def set_filename(new_filename):
""" Change the file name of the log file. The change will be
rejected if the log file is already open.
:param str new_filename: The new file name for the log file.
"""
if PyLg.wfile is None:
PyLg.filename = new_filename
else:
warnings.warn("PyLg wfile is open - cannot change filename")
@staticmethod
def write(string):
""" Write to the log file. A new log file is opened and
initialised if it has not been opened yet.
:param str string: The string to be written to the log file.
"""
if PyLg.wfile is None:
PyLg.wfile = open(PyLg.filename, "w")
PyLg.wfile.write("=== Log initialised at " +
str(datetime.now()) + " ===\n\n")
PyLg.wfile.write(string)
@staticmethod
def close():
""" Close the log file.
"""
if PyLg.wfile is not None:
PyLg.wfile.close()
PyLg.wfile = None
else:
warnings.warn("PyLg wfile is not open - nothing to close")
class TraceFunction(object):
""" Class that serves as a decorator to trace entry and exit from
functions. Used by appending @TraceFunction on top of the
definition of the function to trace.
"""
class TraceFunctionStruct(object):
""" Internal object to handle traced function properties.
"""
function = None
varnames = None
defaults = None
filename = None
lineno = None
classname = None
functionname = None
def __get__(self, obj, objtype):
""" Support for instance functions.
"""
return partial(self.__call__, obj)
def __init__(self, *args, **kwargs):
""" Constructor for TraceFunction. Note that the behaviour is
different depending on whether TraceFunction is passed any
parameters. For details see __call__ in this class.
"""
#-----------------------------------------------------------------------
# Make sure this decorator is never called with no arguments.
#-----------------------------------------------------------------------
assert args or kwargs
if args:
self.trace_args = DEFAULT_TRACE_ARGS
self.trace_rv = DEFAULT_TRACE_RV
#-------------------------------------------------------------------
# The function init_function will verify the input.
#-------------------------------------------------------------------
self.init_function(*args, **kwargs)
if kwargs:
trace_args_str = 'trace_args'
trace_rv_str = 'trace_rv'
#-------------------------------------------------------------------
# If kwargs is non-empty, it should only contain trace_rv,
# trace_args, or both and args should be empty. Assert all
# this.
#-------------------------------------------------------------------
assert not args
assert (len(kwargs) > 0) and (len(kwargs) <= 2)
if len(kwargs) == 1:
assert (trace_rv_str in kwargs) or (trace_args_str in kwargs)
elif len(kwargs) == 2:
assert (trace_rv_str in kwargs) and (trace_args_str in kwargs)
if trace_args_str in kwargs:
self.trace_args = kwargs[trace_args_str]
else:
self.trace_args = DEFAULT_TRACE_ARGS
if trace_rv_str in kwargs:
self.trace_rv = kwargs[trace_rv_str]
else:
self.trace_rv = DEFAULT_TRACE_RV
self.function = None
def __call__(self, *args, **kwargs):
""" The actual wrapper that is called when a call to a
decorated function is made. It also handles extra
initialisation when parameters are passed to
TraceFunction.
:return: The return value of the decorated function.
"""
#-----------------------------------------------------------------------
# __call__ has to behave differently depending on whether the
# decorator has been given any parameters. The reason for this
# is as follows:
#
# @TraceFunction
# decorated_function
#
# translates to TraceFunction(decorated_function)
#
# @TraceFunction(*args, **kwargs)
# decorated_function
#
# translates to TraceFunction(*args, **kwargs)(decorated_function)
#
# In both cases, the result should be a callable object which
# will be called whenever the decorated function is called. In
# the first case, the callable object is an instance of
# TraceFunction, in the latter case the return value of
# TraceFunction.__call__ is the callable object.
#-----------------------------------------------------------------------
if self.function is None:
#-------------------------------------------------------------------
# If the decorator has been passed a parameter, __init__
# will not define self.function and __call__ will be
# called immediately after __init__ with the decorated
# function as the only parameter. Therefore, this __call__
# function has to return the callable object that is meant
# to be called every time the decorated function is
# called. Here, self is returned in order to return the
# object as the callable handle for the decorated
# function. This if block should be hit only once at most
# and only during initialisation.
#-------------------------------------------------------------------
self.init_function(*args, **kwargs)
return self
#-----------------------------------------------------------------------
# The actual decorating.
#-----------------------------------------------------------------------
if PYLG_ENABLE:
ClassNameStack.insert(self.function.classname)
self.trace_entry(*args, **kwargs)
try:
rv = self.function.function(*args, **kwargs)
except Exception as e:
self.trace_exception(e)
exc_info = sys.exc_info()
raise (exc_info[0], exc_info[1], exc_info[2])
self.trace_exit(rv)
ClassNameStack.pop()
else:
#-------------------------------------------------------------------
# If PYLG is disabled, don't wrap anything.
#-------------------------------------------------------------------
rv = self.function.function(*args, **kwargs)
return rv
def init_function(self, *args, **kwargs):
""" Function to initialise the TraceFunctionStruct kept by the
decorator.
"""
#-----------------------------------------------------------------------
# This function should only ever be called with one parameter
# - the function to be decorated. These checks are done here,
# rather than by the caller, as anything that calls this
# function should also have been called with the decorated
# function as its only parameter.
#-----------------------------------------------------------------------
assert not kwargs
assert len(args) == 1
assert callable(args[0])
self.function = TraceFunction.TraceFunctionStruct()
self.function.function = args[0]
argspec = inspect.getargspec(self.function.function)
self.function.varnames = argspec.args
if argspec.defaults is not None:
self.function.defaults = dict(
zip(argspec.args[-len(argspec.defaults):],
argspec.defaults))
#-----------------------------------------------------------------------
# init_function is called from either __init__ or __call__ and
# we want the frame before that.
#-----------------------------------------------------------------------
frames_back = 2
caller_frame = inspect.stack()[frames_back]
self.function.filename = os.path.basename(caller_frame[1])
self.function.lineno = caller_frame[2]
self.function.classname = caller_frame[3]
self.function.functionname = self.function.function.__name__
def trace_entry(self, *args, **kwargs):
""" Called on function entry. This function collects all the
function arguments and constructs a message to pass to
trace.
"""
#-----------------------------------------------------------------------
# The ENTRY message.
#-----------------------------------------------------------------------
msg = "-> ENTRY"
if args or kwargs:
msg += ": "
n_args = len(args)
if self.trace_args:
for arg in range(n_args):
msg += (self.function.varnames[arg] + " = " +
str(args[arg]) + ", ")
for name in self.function.varnames[n_args:]:
msg += name + " = "
if name in kwargs:
msg += str(kwargs[name])
else:
msg += str(self.function.defaults[name])
msg += ", "
msg = msg[:-2]
else:
msg += "---"
trace(msg, function = self.function)
def trace_exit(self, rv = None):
""" Called on function exit to log the fact that a function has
finished executing.
:param rv: The return value of the traced function.
"""
#-----------------------------------------------------------------------
# The EXIT message.
#-----------------------------------------------------------------------
msg = "<- EXIT "
if rv is not None:
msg += ": "
if self.trace_rv:
msg += str(rv)
else:
msg += "---"
trace(msg, function = self.function)
return
def trace_exception(self, exception):
""" Called when a function terminated due to an exception.
:param exception: The raised exception.
"""
#-----------------------------------------------------------------------
# The EXIT message.
#-----------------------------------------------------------------------
core_msg = type(exception).__name__ + " RAISED"
msg = "<- EXIT : " + core_msg
if str(exception) is not "":
msg += " - " + str(exception)
if EXCEPTION_WARNING:
warnings.warn(core_msg, RuntimeWarning)
trace(msg, function = self.function)
return
def trace(message, function = None):
""" Writes message to the log file. It will also log the time,
filename, line number and function name.
:param str message: The log message.
:param function: A TraceFunctionStruct object if called from within
TraceFunction.
"""
if not PYLG_ENABLE:
#-----------------------------------------------------------------------
# Don't do anything if PYLG is disabled
#-----------------------------------------------------------------------
return
if function is None:
#-----------------------------------------------------------------------
# If there is no function object, we need to work out
# where the trace call was made from.
#-----------------------------------------------------------------------
frames_back = 1
caller_frame = inspect.stack()[frames_back]
filename = os.path.basename(caller_frame[1])
lineno = caller_frame[2]
functionname = caller_frame[3]
else:
filename = function.filename
lineno = function.lineno
functionname = function.functionname
#---------------------------------------------------------------------------
# If CLASS_NAME_RESOLUTION is enabled, the top element of the
# stack should be the class name of the function from which this
# trace call is made. This cannot be policed so the user must make
# sure this is the case by ensuring that trace is only called
# outside of any function or from within functions that have the
# @TraceFunction decorator.
#---------------------------------------------------------------------------
classname = ClassNameStack.get()
if classname is not None and classname != "<module>":
functionname = classname + "." + functionname
#---------------------------------------------------------------------------
# Write the data to the log file.
#---------------------------------------------------------------------------
PyLg.write(str(datetime.now()) + " " +
'{filename:{w}.{w}} '.format(filename = filename,
w = FILENAME_COLUMN_WIDTH) +
'{0:04d}: '.format(lineno) +
'{function:{w}.{w}} '.format(function = functionname,
w = FUNCTION_COLUMN_WIDTH) +
message + "\n")

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#-------------------------------------------------------------------------------
# PyLg: module to facilitate and automate the process of writing runtime logs.
# Copyright (C) 2017 Wojciech Kozlowski <wojciech.kozlowski@vivaldi.net>
#
# 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/>.
#-------------------------------------------------------------------------------
#-------------------------------------------------------------------------------
# Enable/disable PyLg.
#-------------------------------------------------------------------------------
PYLG_ENABLE = True
#-------------------------------------------------------------------------------
# Log file.
#-------------------------------------------------------------------------------
PYLG = 'pylg.log'
#-------------------------------------------------------------------------------
# Enable class name resolution. Function names will be printed with
# their class names.
#
# IMPORTANT: If this setting is enabled, the trace function should
# ONLY be called from within functions that have the @TraceFunction
# decorator OR outside of any function.
#-------------------------------------------------------------------------------
CLASS_NAME_RESOLUTION = False
#-------------------------------------------------------------------------------
# The default for whether TraceFunction should trace function
# parameters and return values.
#-------------------------------------------------------------------------------
DEFAULT_TRACE_ARGS = True
DEFAULT_TRACE_RV = True
#-------------------------------------------------------------------------------
# Whether to warn the user when an Exception has been raised in a
# traced funcion.
#-------------------------------------------------------------------------------
EXCEPTION_WARNING = True
#-------------------------------------------------------------------------------
# The column width for file and function names.
#-------------------------------------------------------------------------------
FILENAME_COLUMN_WIDTH = 32
FUNCTION_COLUMN_WIDTH = 32

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from setuptools import setup, find_packages
from codecs import open
from os import path
pwd = path.abspath(path.dirname(__file__))
with open(path.join(pwd, 'README.rst'), encoding='utf-8') as f:
long_description = f.read()
setup(
name = 'PyLg',
version = '1.1.0',
description = 'Python module to facilitate and automate the process of writing runtime logs.',
long_description = long_description,
url = 'https://gitlab.wojciechkozlowski.eu/wojtek/PyLg',
author = 'Wojciech Kozlowski',
author_email = 'wojciech.kozlowski@vivaldi.net',
classifiers = [
'Development Status :: 3 - Alpha',
'Intended Audience :: Developers',
'Topic :: Software Development :: Debuggers',
'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
'Programming Language :: Python :: 2.7',
'Programming Language :: Python :: 3',
],
keywords='development log debug trace',
include_package_data = True,
packages=["pylg"]
)