upgrade: fixed old style rc upgrade sometimes used with a very old installer.
upgrade: fixed old style rc upgrade sometimes used with a very old installer.

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r3505:c75dd264 stable
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patches.py
98 lines | 3.7 KiB | text/x-python | PythonLexer
# -*- coding: utf-8 -*-
# Copyright (C) 2016-2019 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# 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 Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/
"""
Compatibility patches.
Please keep the following principles in mind:
* Keep imports local, so that importing this module does not cause too many
side effects by itself.
* Try to make patches idempotent, calling them multiple times should not do
harm. If that is not possible, ensure that the second call explodes.
"""
def inspect_getargspec():
"""
Pyramid rely on inspect.getargspec to lookup the signature of
view functions. This is not compatible with cython, therefore we replace
getargspec with a custom version.
Code is inspired by the inspect module from Python-3.4
"""
import inspect
def _isCython(func):
"""
Private helper that checks if a function is a cython function.
"""
return func.__class__.__name__ == 'cython_function_or_method'
def unwrap(func):
"""
Get the object wrapped by *func*.
Follows the chain of :attr:`__wrapped__` attributes returning the last
object in the chain.
*stop* is an optional callback accepting an object in the wrapper chain
as its sole argument that allows the unwrapping to be terminated early
if the callback returns a true value. If the callback never returns a
true value, the last object in the chain is returned as usual. For
example, :func:`signature` uses this to stop unwrapping if any object
in the chain has a ``__signature__`` attribute defined.
:exc:`ValueError` is raised if a cycle is encountered.
"""
f = func # remember the original func for error reporting
memo = {id(f)} # Memoise by id to tolerate non-hashable objects
while hasattr(func, '__wrapped__'):
func = func.__wrapped__
id_func = id(func)
if id_func in memo:
raise ValueError('wrapper loop when unwrapping {!r}'.format(f))
memo.add(id_func)
return func
def custom_getargspec(func):
"""
Get the names and default values of a function's arguments.
A tuple of four things is returned: (args, varargs, varkw, defaults).
'args' is a list of the argument names (it may contain nested lists).
'varargs' and 'varkw' are the names of the * and ** arguments or None.
'defaults' is an n-tuple of the default values of the last n arguments.
"""
func = unwrap(func)
if inspect.ismethod(func):
func = func.im_func
if not inspect.isfunction(func):
if not _isCython(func):
raise TypeError('{!r} is not a Python or Cython function'
.format(func))
args, varargs, varkw = inspect.getargs(func.func_code)
return inspect.ArgSpec(args, varargs, varkw, func.func_defaults)
inspect.getargspec = custom_getargspec