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# -*- coding: utf-8 -*-
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# Copyright (C) 2016-2019 RhodeCode GmbH
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License, version 3
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# (only), as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# This program is dual-licensed. If you wish to learn more about the
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# RhodeCode Enterprise Edition, including its added features, Support services,
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# and proprietary license terms, please see https://rhodecode.com/licenses/
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"""
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Compatibility patches.
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Please keep the following principles in mind:
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* Keep imports local, so that importing this module does not cause too many
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side effects by itself.
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* Try to make patches idempotent, calling them multiple times should not do
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harm. If that is not possible, ensure that the second call explodes.
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"""
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def inspect_getargspec():
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"""
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Pyramid rely on inspect.getargspec to lookup the signature of
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view functions. This is not compatible with cython, therefore we replace
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getargspec with a custom version.
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Code is inspired by the inspect module from Python-3.4
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"""
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import inspect
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def _isCython(func):
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"""
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Private helper that checks if a function is a cython function.
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"""
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return func.__class__.__name__ == 'cython_function_or_method'
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def unwrap(func):
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"""
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Get the object wrapped by *func*.
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Follows the chain of :attr:`__wrapped__` attributes returning the last
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object in the chain.
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*stop* is an optional callback accepting an object in the wrapper chain
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as its sole argument that allows the unwrapping to be terminated early
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if the callback returns a true value. If the callback never returns a
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true value, the last object in the chain is returned as usual. For
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example, :func:`signature` uses this to stop unwrapping if any object
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in the chain has a ``__signature__`` attribute defined.
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:exc:`ValueError` is raised if a cycle is encountered.
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"""
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f = func # remember the original func for error reporting
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memo = {id(f)} # Memoise by id to tolerate non-hashable objects
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while hasattr(func, '__wrapped__'):
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func = func.__wrapped__
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id_func = id(func)
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if id_func in memo:
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raise ValueError('wrapper loop when unwrapping {!r}'.format(f))
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memo.add(id_func)
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return func
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def custom_getargspec(func):
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"""
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Get the names and default values of a function's arguments.
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A tuple of four things is returned: (args, varargs, varkw, defaults).
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'args' is a list of the argument names (it may contain nested lists).
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'varargs' and 'varkw' are the names of the * and ** arguments or None.
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'defaults' is an n-tuple of the default values of the last n arguments.
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"""
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func = unwrap(func)
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if inspect.ismethod(func):
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func = func.im_func
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if not inspect.isfunction(func):
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if not _isCython(func):
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raise TypeError('{!r} is not a Python or Cython function'
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.format(func))
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args, varargs, varkw = inspect.getargs(func.func_code)
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return inspect.ArgSpec(args, varargs, varkw, func.func_defaults)
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inspect.getargspec = custom_getargspec
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