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Sat, Jun 29, 14:12

utils.py
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# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2011, 2012, 2013, 2014 CERN.
#
# Invenio 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 2 of the
# License, or (at your option) any later version.
#
# Invenio 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 Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""Implement various utils.
Utilities that could potentially exist in separate packages should be placed in
this file.
"""
from flask import has_app_context, current_app
from werkzeug.utils import import_string, find_modules
from functools import partial
def import_module_from_packages(name, app=None, packages=None, silent=False):
"""Import modules from packages."""
warnings.warn("Use of import_module_from_packages has been deprecated."
" Please use Flask-Registry instead.", DeprecationWarning)
if app is None and has_app_context():
app = current_app
if app is None:
raise Exception(
'Working outside application context or provide app'
)
if packages is None:
packages = app.config.get('PACKAGES', [])
for package in packages:
if package.endswith('.*'):
for module in find_modules(package[:-2], include_packages=True):
try:
yield import_string(module + '.' + name, silent)
except ImportError:
pass
except Exception:
app.logger.exception("could not import %s.%s",
package, name)
continue
try:
yield import_string(package + '.' + name, silent)
except ImportError:
pass
except Exception:
app.logger.exception("could not import %s.%s", package, name)
autodiscover_user_settings = partial(import_module_from_packages,
'user_settings')
autodiscover_managers = partial(import_module_from_packages, 'manage')
def try_to_eval(string, context={}, **general_context):
"""Take care of evaluating the python expression.
If an exception happens, it tries to import the needed module.
@param string: String to evaluate
@param context: Context needed, in some cases, to evaluate the string
@return: The value of the expression inside string
"""
if not string:
return None
res = None
imports = []
general_context.update(context)
simple = False
while True:
try:
# kwalitee: disable=eval
res = eval(string, globals().update(general_context), locals())
except NameError as err:
#Try first to import using werkzeug import_string
try:
from werkzeug.utils import import_string
if "." in string:
part = string.split('.')[0]
import_string(part)
for i in string.split('.')[1:]:
part += '.' + i
import_string(part)
continue
else:
simple = True
except:
pass
import_name = str(err).split("'")[1]
if import_name not in imports:
if import_name in context:
globals()[import_name] = context[import_name]
else:
globals()[import_name] = __import__(import_name)
imports.append(import_name)
continue
elif simple:
import_name = str(err).split("'")[0]
if import_name in context:
globals()[import_name] = context[import_name]
else:
globals()[import_name] = __import__(import_name)
imports.append(import_name)
continue
raise ImportError("Can't import the needed module to evaluate %s"
(string, ))
import os
if isinstance(res, type(os)):
raise ImportError
return res
#
# Python 2.6 implementation of logging.captureWarnings introduced in Python 2.7
# Copy/pasted from logging/__init__.py. Can be removed as soon as dependency on
# Python 2.6 is removed.
import logging
import warnings
import sys
class NullHandler(logging.Handler):
"""This handler does nothing.
It's intended to be used to avoid the
"No handlers could be found for logger XXX" one-off warning. This is
important for library code, which may contain code to log events. If a user
of the library does not configure logging, the one-off warning might be
produced; to avoid this, the library developer simply needs to instantiate
a NullHandler and add it to the top-level logger of the library module or
package.
"""
def handle(self, record):
"""Handle."""
pass
def emit(self, record):
"""Emit."""
pass
def createLock(self):
"""Lock."""
self.lock = None
_warnings_showwarning = None
def _showwarning(message, category, filename, lineno, file=None, line=None):
"""Implementation of showwarnings which redirects to logging.
It will first check to see if the file parameter is None.
If a file is specified, it will
delegate to the original warnings implementation of showwarning. Otherwise,
it will call warnings.formatwarning and will log the resulting string to a
warnings logger named "py.warnings" with level logging.WARNING.
"""
if sys.hexversion >= 0x2070000:
raise RuntimeError("_showwarning() should not be used on Python 2.7+")
if file is not None:
if _warnings_showwarning is not None:
_warnings_showwarning(message, category, filename, lineno, file,
line)
else:
s = warnings.formatwarning(message, category, filename, lineno, line)
logger = logging.getLogger("py.warnings")
if not logger.handlers:
logger.addHandler(NullHandler())
logger.warning("%s", s)
def _captureWarnings(capture):
"""If capture is true, redirect all warnings to the logging package.
If capture is False, ensure that warnings are not redirected to logging
but to their original destinations.
"""
if sys.hexversion >= 0x2070000:
raise RuntimeError(
"_captureWarnings() should not be used on Python 2.7+"
)
global _warnings_showwarning
if capture:
if _warnings_showwarning is None:
_warnings_showwarning = warnings.showwarning
warnings.showwarning = _showwarning
else:
if _warnings_showwarning is not None:
warnings.showwarning = _warnings_showwarning
_warnings_showwarning = None
if sys.hexversion >= 0x2070000:
captureWarnings = logging.captureWarnings
else:
captureWarnings = _captureWarnings
# https://mail.python.org/pipermail/python-ideas/2011-January/008958.html
class staticproperty(object):
"""Property decorator for static methods."""
def __init__(self, function):
self._function = function
def __get__(self, instance, owner):
return self._function()
class classproperty(object):
"""Property decorator for class methods."""
def __init__(self, function):
self._function = function
def __get__(self, instance, owner):
return self._function(owner)

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