mirror of
https://github.com/django/django.git
synced 2025-11-07 07:15:35 +00:00
331 lines
12 KiB
Python
331 lines
12 KiB
Python
import functools
|
|
import inspect
|
|
import os
|
|
import warnings
|
|
from collections import Counter
|
|
|
|
from asgiref.sync import iscoroutinefunction, markcoroutinefunction, sync_to_async
|
|
|
|
import django
|
|
|
|
|
|
@functools.cache
|
|
def django_file_prefixes():
|
|
try:
|
|
file = django.__file__
|
|
except AttributeError:
|
|
return ()
|
|
return (os.path.dirname(file),)
|
|
|
|
|
|
class RemovedInNextVersionWarning(DeprecationWarning):
|
|
pass
|
|
|
|
|
|
class RemovedInDjango70Warning(PendingDeprecationWarning):
|
|
pass
|
|
|
|
|
|
RemovedAfterNextVersionWarning = RemovedInDjango70Warning
|
|
|
|
|
|
class warn_about_renamed_method:
|
|
def __init__(
|
|
self, class_name, old_method_name, new_method_name, deprecation_warning
|
|
):
|
|
self.class_name = class_name
|
|
self.old_method_name = old_method_name
|
|
self.new_method_name = new_method_name
|
|
self.deprecation_warning = deprecation_warning
|
|
|
|
def __call__(self, f):
|
|
def wrapper(*args, **kwargs):
|
|
warnings.warn(
|
|
"`%s.%s` is deprecated, use `%s` instead."
|
|
% (self.class_name, self.old_method_name, self.new_method_name),
|
|
self.deprecation_warning,
|
|
2,
|
|
)
|
|
return f(*args, **kwargs)
|
|
|
|
return wrapper
|
|
|
|
|
|
class RenameMethodsBase(type):
|
|
"""
|
|
Handles the deprecation paths when renaming a method.
|
|
|
|
It does the following:
|
|
1) Define the new method if missing and complain about it.
|
|
2) Define the old method if missing.
|
|
3) Complain whenever an old method is called.
|
|
|
|
See #15363 for more details.
|
|
"""
|
|
|
|
renamed_methods = ()
|
|
|
|
def __new__(cls, name, bases, attrs):
|
|
new_class = super().__new__(cls, name, bases, attrs)
|
|
|
|
for base in inspect.getmro(new_class):
|
|
class_name = base.__name__
|
|
for renamed_method in cls.renamed_methods:
|
|
old_method_name = renamed_method[0]
|
|
old_method = base.__dict__.get(old_method_name)
|
|
new_method_name = renamed_method[1]
|
|
new_method = base.__dict__.get(new_method_name)
|
|
deprecation_warning = renamed_method[2]
|
|
wrapper = warn_about_renamed_method(class_name, *renamed_method)
|
|
|
|
# Define the new method if missing and complain about it
|
|
if not new_method and old_method:
|
|
warnings.warn(
|
|
"`%s.%s` method should be renamed `%s`."
|
|
% (class_name, old_method_name, new_method_name),
|
|
deprecation_warning,
|
|
2,
|
|
)
|
|
setattr(base, new_method_name, old_method)
|
|
setattr(base, old_method_name, wrapper(old_method))
|
|
|
|
# Define the old method as a wrapped call to the new method.
|
|
if not old_method and new_method:
|
|
setattr(base, old_method_name, wrapper(new_method))
|
|
|
|
return new_class
|
|
|
|
|
|
def deprecate_posargs(deprecation_warning, remappable_names, /):
|
|
"""
|
|
Function/method decorator to deprecate some or all positional arguments.
|
|
|
|
The decorated function will map any positional arguments after the ``*`` to
|
|
the corresponding keyword arguments and issue a deprecation warning.
|
|
|
|
The decorator takes two arguments: a RemovedInDjangoXXWarning warning
|
|
category and a list of parameter names that have been changed from
|
|
positional-or-keyword to keyword-only, in their original positional order.
|
|
|
|
Works on both functions and methods. To apply to a class constructor,
|
|
decorate its __init__() method. To apply to a staticmethod or classmethod,
|
|
use @deprecate_posargs after @staticmethod or @classmethod.
|
|
|
|
Example: to deprecate passing option1 or option2 as posargs, change::
|
|
|
|
def some_func(request, option1, option2=True):
|
|
...
|
|
|
|
to::
|
|
|
|
@deprecate_posargs(RemovedInDjangoXXWarning, ["option1", "option2"])
|
|
def some_func(request, *, option1, option2=True):
|
|
...
|
|
|
|
After the deprecation period, remove the decorator (but keep the ``*``)::
|
|
|
|
def some_func(request, *, option1, option2=True):
|
|
...
|
|
|
|
Caution: during the deprecation period, do not add any new *positional*
|
|
parameters or change the remaining ones. For example, this attempt to add a
|
|
new param would break code using the deprecated posargs::
|
|
|
|
@deprecate_posargs(RemovedInDjangoXXWarning, ["option1", "option2"])
|
|
def some_func(request, wrong_new_param=None, *, option1, option2=True):
|
|
# Broken: existing code may pass a value intended as option1 in the
|
|
# wrong_new_param position.
|
|
...
|
|
|
|
However, it's acceptable to add new *keyword-only* parameters and to
|
|
re-order the existing ones, so long as the list passed to
|
|
@deprecate_posargs is kept in the original posargs order. This change will
|
|
work without breaking existing code::
|
|
|
|
@deprecate_posargs(RemovedInDjangoXXWarning, ["option1", "option2"])
|
|
def some_func(request, *, new_param=None, option2=True, option1):
|
|
...
|
|
|
|
The @deprecate_posargs decorator adds a small amount of overhead. In most
|
|
cases it won't be significant, but use with care in performance-critical
|
|
code paths.
|
|
"""
|
|
|
|
def decorator(func):
|
|
if isinstance(func, type):
|
|
raise TypeError(
|
|
"@deprecate_posargs cannot be applied to a class. (Apply it "
|
|
"to the __init__ method.)"
|
|
)
|
|
if isinstance(func, classmethod):
|
|
raise TypeError("Apply @classmethod before @deprecate_posargs.")
|
|
if isinstance(func, staticmethod):
|
|
raise TypeError("Apply @staticmethod before @deprecate_posargs.")
|
|
|
|
params = inspect.signature(func).parameters
|
|
num_by_kind = Counter(param.kind for param in params.values())
|
|
|
|
if num_by_kind[inspect.Parameter.VAR_POSITIONAL] > 0:
|
|
raise TypeError(
|
|
"@deprecate_posargs() cannot be used with variable positional `*args`."
|
|
)
|
|
|
|
num_positional_params = (
|
|
num_by_kind[inspect.Parameter.POSITIONAL_ONLY]
|
|
+ num_by_kind[inspect.Parameter.POSITIONAL_OR_KEYWORD]
|
|
)
|
|
num_keyword_only_params = num_by_kind[inspect.Parameter.KEYWORD_ONLY]
|
|
if num_keyword_only_params < 1:
|
|
raise TypeError(
|
|
"@deprecate_posargs() requires at least one keyword-only parameter "
|
|
"(after a `*` entry in the parameters list)."
|
|
)
|
|
if any(
|
|
name not in params or params[name].kind != inspect.Parameter.KEYWORD_ONLY
|
|
for name in remappable_names
|
|
):
|
|
raise TypeError(
|
|
"@deprecate_posargs() requires all remappable_names to be "
|
|
"keyword-only parameters."
|
|
)
|
|
|
|
num_remappable_args = len(remappable_names)
|
|
max_positional_args = num_positional_params + num_remappable_args
|
|
|
|
func_name = func.__name__
|
|
if func_name == "__init__":
|
|
# In the warning, show "ClassName()" instead of "__init__()".
|
|
# The class isn't defined yet, but its name is in __qualname__.
|
|
# Some examples of __qualname__:
|
|
# - ClassName.__init__
|
|
# - Nested.ClassName.__init__
|
|
# - MyTests.test_case.<locals>.ClassName.__init__
|
|
local_name = func.__qualname__.rsplit("<locals>.", 1)[-1]
|
|
class_name = local_name.replace(".__init__", "")
|
|
func_name = class_name
|
|
|
|
def remap_deprecated_args(args, kwargs):
|
|
"""
|
|
Move deprecated positional args to kwargs and issue a warning.
|
|
Return updated (args, kwargs).
|
|
"""
|
|
if (num_positional_args := len(args)) > max_positional_args:
|
|
raise TypeError(
|
|
f"{func_name}() takes at most {max_positional_args} positional "
|
|
f"argument(s) (including {num_remappable_args} deprecated) but "
|
|
f"{num_positional_args} were given."
|
|
)
|
|
|
|
# Identify which of the _potentially remappable_ params are
|
|
# actually _being remapped_ in this particular call.
|
|
remapped_names = remappable_names[
|
|
: num_positional_args - num_positional_params
|
|
]
|
|
conflicts = set(remapped_names) & set(kwargs)
|
|
if conflicts:
|
|
# Report duplicate names in the original parameter order.
|
|
conflicts_str = ", ".join(
|
|
f"'{name}'" for name in remapped_names if name in conflicts
|
|
)
|
|
raise TypeError(
|
|
f"{func_name}() got both deprecated positional and keyword "
|
|
f"argument values for {conflicts_str}."
|
|
)
|
|
|
|
# Do the remapping.
|
|
remapped_kwargs = dict(
|
|
zip(remapped_names, args[num_positional_params:], strict=True)
|
|
)
|
|
remaining_args = args[:num_positional_params]
|
|
updated_kwargs = kwargs | remapped_kwargs
|
|
|
|
# Issue the deprecation warning.
|
|
remapped_names_str = ", ".join(f"'{name}'" for name in remapped_names)
|
|
warnings.warn(
|
|
f"Passing positional argument(s) {remapped_names_str} to {func_name}() "
|
|
"is deprecated. Use keyword arguments instead.",
|
|
deprecation_warning,
|
|
skip_file_prefixes=django_file_prefixes(),
|
|
)
|
|
|
|
return remaining_args, updated_kwargs
|
|
|
|
if iscoroutinefunction(func):
|
|
|
|
@functools.wraps(func)
|
|
async def wrapper(*args, **kwargs):
|
|
if len(args) > num_positional_params:
|
|
args, kwargs = remap_deprecated_args(args, kwargs)
|
|
return await func(*args, **kwargs)
|
|
|
|
else:
|
|
|
|
@functools.wraps(func)
|
|
def wrapper(*args, **kwargs):
|
|
if len(args) > num_positional_params:
|
|
args, kwargs = remap_deprecated_args(args, kwargs)
|
|
return func(*args, **kwargs)
|
|
|
|
return wrapper
|
|
|
|
return decorator
|
|
|
|
|
|
class MiddlewareMixin:
|
|
sync_capable = True
|
|
async_capable = True
|
|
|
|
def __init__(self, get_response):
|
|
if get_response is None:
|
|
raise ValueError("get_response must be provided.")
|
|
self.get_response = get_response
|
|
# If get_response is a coroutine function, turns us into async mode so
|
|
# a thread is not consumed during a whole request.
|
|
self.async_mode = iscoroutinefunction(self.get_response)
|
|
if self.async_mode:
|
|
# Mark the class as async-capable, but do the actual switch inside
|
|
# __call__ to avoid swapping out dunder methods.
|
|
markcoroutinefunction(self)
|
|
super().__init__()
|
|
|
|
def __repr__(self):
|
|
return "<%s get_response=%s>" % (
|
|
self.__class__.__qualname__,
|
|
getattr(
|
|
self.get_response,
|
|
"__qualname__",
|
|
self.get_response.__class__.__name__,
|
|
),
|
|
)
|
|
|
|
def __call__(self, request):
|
|
# Exit out to async mode, if needed
|
|
if self.async_mode:
|
|
return self.__acall__(request)
|
|
response = None
|
|
if hasattr(self, "process_request"):
|
|
response = self.process_request(request)
|
|
response = response or self.get_response(request)
|
|
if hasattr(self, "process_response"):
|
|
response = self.process_response(request, response)
|
|
return response
|
|
|
|
async def __acall__(self, request):
|
|
"""
|
|
Async version of __call__ that is swapped in when an async request
|
|
is running.
|
|
"""
|
|
response = None
|
|
if hasattr(self, "process_request"):
|
|
response = await sync_to_async(
|
|
self.process_request,
|
|
thread_sensitive=True,
|
|
)(request)
|
|
response = response or await self.get_response(request)
|
|
if hasattr(self, "process_response"):
|
|
response = await sync_to_async(
|
|
self.process_response,
|
|
thread_sensitive=True,
|
|
)(request, response)
|
|
return response
|