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# util/deprecations.py
# Copyright (C) 2005-2021 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""Helpers related to deprecation of functions, methods, classes, other
functionality."""
import re
import warnings
from . import compat
from .langhelpers import _hash_limit_string
from .langhelpers import decorator
from .langhelpers import inject_docstring_text
from .langhelpers import inject_param_text
from .. import exc
def warn_deprecated(msg, stacklevel=3):
warnings.warn(msg, exc.SADeprecationWarning, stacklevel=stacklevel)
def warn_deprecated_limited(msg, args, stacklevel=3):
"""Issue a deprecation warning with a parameterized string,
limiting the number of registrations.
"""
if args:
msg = _hash_limit_string(msg, 10, args)
warnings.warn(msg, exc.SADeprecationWarning, stacklevel)
def warn_pending_deprecation(msg, stacklevel=3):
warnings.warn(msg, exc.SAPendingDeprecationWarning, stacklevel=stacklevel)
def deprecated_cls(version, message, constructor="__init__"):
header = ".. deprecated:: %s %s" % (version, (message or ""))
def decorate(cls):
return _decorate_cls_with_warning(
cls,
constructor,
exc.SADeprecationWarning,
message % dict(func=constructor),
header,
)
return decorate
def deprecated(version, message=None, add_deprecation_to_docstring=True):
"""Decorates a function and issues a deprecation warning on use.
:param version:
Issue version in the warning.
:param message:
If provided, issue message in the warning. A sensible default
is used if not provided.
:param add_deprecation_to_docstring:
Default True. If False, the wrapped function's __doc__ is left
as-is. If True, the 'message' is prepended to the docs if
provided, or sensible default if message is omitted.
"""
if add_deprecation_to_docstring:
header = ".. deprecated:: %s %s" % (version, (message or ""))
else:
header = None
if message is None:
message = "Call to deprecated function %(func)s"
def decorate(fn):
return _decorate_with_warning(
fn,
exc.SADeprecationWarning,
message % dict(func=fn.__name__),
header,
)
return decorate
def deprecated_params(**specs):
"""Decorates a function to warn on use of certain parameters.
e.g. ::
@deprecated_params(
weak_identity_map=(
"0.7",
"the :paramref:`.Session.weak_identity_map parameter "
"is deprecated."
)
)
"""
messages = {}
for param, (version, message) in specs.items():
messages[param] = _sanitize_restructured_text(message)
def decorate(fn):
spec = compat.inspect_getfullargspec(fn)
if spec.defaults is not None:
defaults = dict(
zip(
spec.args[(len(spec.args) - len(spec.defaults)) :],
spec.defaults,
)
)
check_defaults = set(defaults).intersection(messages)
check_kw = set(messages).difference(defaults)
else:
check_defaults = ()
check_kw = set(messages)
@decorator
def warned(fn, *args, **kwargs):
for m in check_defaults:
if kwargs[m] != defaults[m]:
warnings.warn(
messages[m], exc.SADeprecationWarning, stacklevel=3
)
for m in check_kw:
if m in kwargs:
warnings.warn(
messages[m], exc.SADeprecationWarning, stacklevel=3
)
return fn(*args, **kwargs)
doc = fn.__doc__ is not None and fn.__doc__ or ""
if doc:
doc = inject_param_text(
doc,
{
param: ".. deprecated:: %s %s" % (version, (message or ""))
for param, (version, message) in specs.items()
},
)
decorated = warned(fn)
decorated.__doc__ = doc
return decorated
return decorate
def pending_deprecation(
version, message=None, add_deprecation_to_docstring=True
):
"""Decorates a function and issues a pending deprecation warning on use.
:param version:
An approximate future version at which point the pending deprecation
will become deprecated. Not used in messaging.
:param message:
If provided, issue message in the warning. A sensible default
is used if not provided.
:param add_deprecation_to_docstring:
Default True. If False, the wrapped function's __doc__ is left
as-is. If True, the 'message' is prepended to the docs if
provided, or sensible default if message is omitted.
"""
if add_deprecation_to_docstring:
header = ".. deprecated:: %s (pending) %s" % (version, (message or ""))
else:
header = None
if message is None:
message = "Call to deprecated function %(func)s"
def decorate(fn):
return _decorate_with_warning(
fn,
exc.SAPendingDeprecationWarning,
message % dict(func=fn.__name__),
header,
)
return decorate
def deprecated_option_value(parameter_value, default_value, warning_text):
if parameter_value is None:
return default_value
else:
warn_deprecated(warning_text)
return parameter_value
def _sanitize_restructured_text(text):
def repl(m):
type_, name = m.group(1, 2)
if type_ in ("func", "meth"):
name += "()"
return name
return re.sub(r"\:(\w+)\:`~?(?:_\w+)?\.?(.+?)`", repl, text)
def _decorate_cls_with_warning(
cls, constructor, wtype, message, docstring_header=None
):
doc = cls.__doc__ is not None and cls.__doc__ or ""
if docstring_header is not None:
docstring_header %= dict(func=constructor)
doc = inject_docstring_text(doc, docstring_header, 1)
if type(cls) is type:
clsdict = dict(cls.__dict__)
clsdict["__doc__"] = doc
cls = type(cls.__name__, cls.__bases__, clsdict)
constructor_fn = clsdict[constructor]
else:
cls.__doc__ = doc
constructor_fn = getattr(cls, constructor)
setattr(
cls,
constructor,
_decorate_with_warning(constructor_fn, wtype, message, None),
)
return cls
def _decorate_with_warning(func, wtype, message, docstring_header=None):
"""Wrap a function with a warnings.warn and augmented docstring."""
message = _sanitize_restructured_text(message)
@decorator
def warned(fn, *args, **kwargs):
warnings.warn(message, wtype, stacklevel=3)
return fn(*args, **kwargs)
doc = func.__doc__ is not None and func.__doc__ or ""
if docstring_header is not None:
docstring_header %= dict(func=func.__name__)
doc = inject_docstring_text(doc, docstring_header, 1)
decorated = warned(func)
decorated.__doc__ = doc
decorated._sa_warn = lambda: warnings.warn(message, wtype, stacklevel=3)
return decorated
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