/usr/lib/python3/dist-packages/twisted/python/deprecate.py is in python3-twisted-experimental 13.2.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 | # -*- test-case-name: twisted.python.test.test_deprecate -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Deprecation framework for Twisted.
To mark a method or function as being deprecated do this::
from twisted.python.versions import Version
from twisted.python.deprecate import deprecated
@deprecated(Version("Twisted", 8, 0, 0))
def badAPI(self, first, second):
'''
Docstring for badAPI.
'''
...
The newly-decorated badAPI will issue a warning when called. It will also have
a deprecation notice appended to its docstring.
To mark module-level attributes as being deprecated you can use::
badAttribute = "someValue"
...
deprecatedModuleAttribute(
Version("Twisted", 8, 0, 0),
"Use goodAttribute instead.",
"your.full.module.name",
"badAttribute")
The deprecated attributes will issue a warning whenever they are accessed. If
the attributes being deprecated are in the same module as the
L{deprecatedModuleAttribute} call is being made from, the C{__name__} global
can be used as the C{moduleName} parameter.
See also L{Version}.
@type DEPRECATION_WARNING_FORMAT: C{str}
@var DEPRECATION_WARNING_FORMAT: The default deprecation warning string format
to use when one is not provided by the user.
"""
from __future__ import division, absolute_import
__all__ = [
'deprecated',
'getDeprecationWarningString',
'getWarningMethod',
'setWarningMethod',
'deprecatedModuleAttribute',
]
import sys, inspect
from warnings import warn, warn_explicit
from dis import findlinestarts
from functools import wraps
from twisted.python.versions import getVersionString
DEPRECATION_WARNING_FORMAT = '%(fqpn)s was deprecated in %(version)s'
# Notionally, part of twisted.python.reflect, but defining it there causes a
# cyclic dependency between this module and that module. Define it here,
# instead, and let reflect import it to re-expose to the public.
def _fullyQualifiedName(obj):
"""
Return the fully qualified name of a module, class, method or function.
Classes and functions need to be module level ones to be correctly
qualified.
@rtype: C{str}.
"""
try:
name = obj.__qualname__
except AttributeError:
name = obj.__name__
if inspect.isclass(obj) or inspect.isfunction(obj):
moduleName = obj.__module__
return "%s.%s" % (moduleName, name)
elif inspect.ismethod(obj):
try:
cls = obj.im_class
except AttributeError:
# Python 3 eliminates im_class, substitutes __module__ and
# __qualname__ to provide similar information.
return "%s.%s" % (obj.__module__, obj.__qualname__)
else:
className = _fullyQualifiedName(cls)
return "%s.%s" % (className, name)
return name
# Try to keep it looking like something in twisted.python.reflect.
_fullyQualifiedName.__module__ = 'twisted.python.reflect'
_fullyQualifiedName.__name__ = 'fullyQualifiedName'
_fullyQualifiedName.__qualname__ = 'fullyQualifiedName'
def _getReplacementString(replacement):
"""
Surround a replacement for a deprecated API with some polite text exhorting
the user to consider it as an alternative.
@type replacement: C{str} or callable
@return: a string like "please use twisted.python.modules.getModule
instead".
"""
if callable(replacement):
replacement = _fullyQualifiedName(replacement)
return "please use %s instead" % (replacement,)
def _getDeprecationDocstring(version, replacement=None):
"""
Generate an addition to a deprecated object's docstring that explains its
deprecation.
@param version: the version it was deprecated.
@type version: L{Version}
@param replacement: The replacement, if specified.
@type replacement: C{str} or callable
@return: a string like "Deprecated in Twisted 27.2.0; please use
twisted.timestream.tachyon.flux instead."
"""
doc = "Deprecated in %s" % (getVersionString(version),)
if replacement:
doc = "%s; %s" % (doc, _getReplacementString(replacement))
return doc + "."
def _getDeprecationWarningString(fqpn, version, format=None, replacement=None):
"""
Return a string indicating that the Python name was deprecated in the given
version.
@param fqpn: Fully qualified Python name of the thing being deprecated
@type fqpn: C{str}
@param version: Version that C{fqpn} was deprecated in.
@type version: L{twisted.python.versions.Version}
@param format: A user-provided format to interpolate warning values into, or
L{DEPRECATION_WARNING_FORMAT
<twisted.python.deprecate.DEPRECATION_WARNING_FORMAT>} if C{None} is
given.
@type format: C{str}
@param replacement: what should be used in place of C{fqpn}. Either pass in
a string, which will be inserted into the warning message, or a
callable, which will be expanded to its full import path.
@type replacement: C{str} or callable
@return: A textual description of the deprecation
@rtype: C{str}
"""
if format is None:
format = DEPRECATION_WARNING_FORMAT
warningString = format % {
'fqpn': fqpn,
'version': getVersionString(version)}
if replacement:
warningString = "%s; %s" % (
warningString, _getReplacementString(replacement))
return warningString
def getDeprecationWarningString(callableThing, version, format=None,
replacement=None):
"""
Return a string indicating that the callable was deprecated in the given
version.
@type callableThing: C{callable}
@param callableThing: Callable object to be deprecated
@type version: L{twisted.python.versions.Version}
@param version: Version that C{callableThing} was deprecated in
@type format: C{str}
@param format: A user-provided format to interpolate warning values into,
or L{DEPRECATION_WARNING_FORMAT
<twisted.python.deprecate.DEPRECATION_WARNING_FORMAT>} if C{None} is
given
@param callableThing: A callable to be deprecated.
@param version: The L{twisted.python.versions.Version} that the callable
was deprecated in.
@param replacement: what should be used in place of the callable. Either
pass in a string, which will be inserted into the warning message,
or a callable, which will be expanded to its full import path.
@type replacement: C{str} or callable
@return: A string describing the deprecation.
@rtype: C{str}
"""
return _getDeprecationWarningString(
_fullyQualifiedName(callableThing), version, format, replacement)
def _appendToDocstring(thingWithDoc, textToAppend):
"""
Append the given text to the docstring of C{thingWithDoc}.
If C{thingWithDoc} has no docstring, then the text just replaces the
docstring. If it has a single-line docstring then it appends a blank line
and the message text. If it has a multi-line docstring, then in appends a
blank line a the message text, and also does the indentation correctly.
"""
if thingWithDoc.__doc__:
docstringLines = thingWithDoc.__doc__.splitlines()
else:
docstringLines = []
if len(docstringLines) == 0:
docstringLines.append(textToAppend)
elif len(docstringLines) == 1:
docstringLines.extend(['', textToAppend, ''])
else:
spaces = docstringLines.pop()
docstringLines.extend(['',
spaces + textToAppend,
spaces])
thingWithDoc.__doc__ = '\n'.join(docstringLines)
def deprecated(version, replacement=None):
"""
Return a decorator that marks callables as deprecated.
@type version: L{twisted.python.versions.Version}
@param version: The version in which the callable will be marked as
having been deprecated. The decorated function will be annotated
with this version, having it set as its C{deprecatedVersion}
attribute.
@param version: the version that the callable was deprecated in.
@type version: L{twisted.python.versions.Version}
@param replacement: what should be used in place of the callable. Either
pass in a string, which will be inserted into the warning message,
or a callable, which will be expanded to its full import path.
@type replacement: C{str} or callable
"""
def deprecationDecorator(function):
"""
Decorator that marks C{function} as deprecated.
"""
warningString = getDeprecationWarningString(
function, version, None, replacement)
@wraps(function)
def deprecatedFunction(*args, **kwargs):
warn(
warningString,
DeprecationWarning,
stacklevel=2)
return function(*args, **kwargs)
_appendToDocstring(deprecatedFunction,
_getDeprecationDocstring(version, replacement))
deprecatedFunction.deprecatedVersion = version
return deprecatedFunction
return deprecationDecorator
def getWarningMethod():
"""
Return the warning method currently used to record deprecation warnings.
"""
return warn
def setWarningMethod(newMethod):
"""
Set the warning method to use to record deprecation warnings.
The callable should take message, category and stacklevel. The return
value is ignored.
"""
global warn
warn = newMethod
class _InternalState(object):
"""
An L{_InternalState} is a helper object for a L{_ModuleProxy}, so that it
can easily access its own attributes, bypassing its logic for delegating to
another object that it's proxying for.
@ivar proxy: a L{ModuleProxy}
"""
def __init__(self, proxy):
object.__setattr__(self, 'proxy', proxy)
def __getattribute__(self, name):
return object.__getattribute__(object.__getattribute__(self, 'proxy'),
name)
def __setattr__(self, name, value):
return object.__setattr__(object.__getattribute__(self, 'proxy'),
name, value)
class _ModuleProxy(object):
"""
Python module wrapper to hook module-level attribute access.
Access to deprecated attributes first checks
L{_ModuleProxy._deprecatedAttributes}, if the attribute does not appear
there then access falls through to L{_ModuleProxy._module}, the wrapped
module object.
@ivar _module: Module on which to hook attribute access.
@type _module: C{module}
@ivar _deprecatedAttributes: Mapping of attribute names to objects that
retrieve the module attribute's original value.
@type _deprecatedAttributes: C{dict} mapping C{str} to
L{_DeprecatedAttribute}
@ivar _lastWasPath: Heuristic guess as to whether warnings about this
package should be ignored for the next call. If the last attribute
access of this module was a C{getattr} of C{__path__}, we will assume
that it was the import system doing it and we won't emit a warning for
the next access, even if it is to a deprecated attribute. The CPython
import system always tries to access C{__path__}, then the attribute
itself, then the attribute itself again, in both successful and failed
cases.
@type _lastWasPath: C{bool}
"""
def __init__(self, module):
state = _InternalState(self)
state._module = module
state._deprecatedAttributes = {}
state._lastWasPath = False
def __repr__(self):
"""
Get a string containing the type of the module proxy and a
representation of the wrapped module object.
"""
state = _InternalState(self)
return '<%s module=%r>' % (type(self).__name__, state._module)
def __setattr__(self, name, value):
"""
Set an attribute on the wrapped module object.
"""
state = _InternalState(self)
state._lastWasPath = False
setattr(state._module, name, value)
def __getattribute__(self, name):
"""
Get an attribute from the module object, possibly emitting a warning.
If the specified name has been deprecated, then a warning is issued.
(Unless certain obscure conditions are met; see
L{_ModuleProxy._lastWasPath} for more information about what might quash
such a warning.)
"""
state = _InternalState(self)
if state._lastWasPath:
deprecatedAttribute = None
else:
deprecatedAttribute = state._deprecatedAttributes.get(name)
if deprecatedAttribute is not None:
# If we have a _DeprecatedAttribute object from the earlier lookup,
# allow it to issue the warning.
value = deprecatedAttribute.get()
else:
# Otherwise, just retrieve the underlying value directly; it's not
# deprecated, there's no warning to issue.
value = getattr(state._module, name)
if name == '__path__':
state._lastWasPath = True
else:
state._lastWasPath = False
return value
class _DeprecatedAttribute(object):
"""
Wrapper for deprecated attributes.
This is intended to be used by L{_ModuleProxy}. Calling
L{_DeprecatedAttribute.get} will issue a warning and retrieve the
underlying attribute's value.
@type module: C{module}
@ivar module: The original module instance containing this attribute
@type fqpn: C{str}
@ivar fqpn: Fully qualified Python name for the deprecated attribute
@type version: L{twisted.python.versions.Version}
@ivar version: Version that the attribute was deprecated in
@type message: C{str}
@ivar message: Deprecation message
"""
def __init__(self, module, name, version, message):
"""
Initialise a deprecated name wrapper.
"""
self.module = module
self.__name__ = name
self.fqpn = module.__name__ + '.' + name
self.version = version
self.message = message
def get(self):
"""
Get the underlying attribute value and issue a deprecation warning.
"""
# This might fail if the deprecated thing is a module inside a package.
# In that case, don't emit the warning this time. The import system
# will come back again when it's not an AttributeError and we can emit
# the warning then.
result = getattr(self.module, self.__name__)
message = _getDeprecationWarningString(self.fqpn, self.version,
DEPRECATION_WARNING_FORMAT + ': ' + self.message)
warn(message, DeprecationWarning, stacklevel=3)
return result
def _deprecateAttribute(proxy, name, version, message):
"""
Mark a module-level attribute as being deprecated.
@type proxy: L{_ModuleProxy}
@param proxy: The module proxy instance proxying the deprecated attributes
@type name: C{str}
@param name: Attribute name
@type version: L{twisted.python.versions.Version}
@param version: Version that the attribute was deprecated in
@type message: C{str}
@param message: Deprecation message
"""
_module = object.__getattribute__(proxy, '_module')
attr = _DeprecatedAttribute(_module, name, version, message)
# Add a deprecated attribute marker for this module's attribute. When this
# attribute is accessed via _ModuleProxy a warning is emitted.
_deprecatedAttributes = object.__getattribute__(
proxy, '_deprecatedAttributes')
_deprecatedAttributes[name] = attr
def deprecatedModuleAttribute(version, message, moduleName, name):
"""
Declare a module-level attribute as being deprecated.
@type version: L{twisted.python.versions.Version}
@param version: Version that the attribute was deprecated in
@type message: C{str}
@param message: Deprecation message
@type moduleName: C{str}
@param moduleName: Fully-qualified Python name of the module containing
the deprecated attribute; if called from the same module as the
attributes are being deprecated in, using the C{__name__} global can
be helpful
@type name: C{str}
@param name: Attribute name to deprecate
"""
module = sys.modules[moduleName]
if not isinstance(module, _ModuleProxy):
module = _ModuleProxy(module)
sys.modules[moduleName] = module
_deprecateAttribute(module, name, version, message)
def warnAboutFunction(offender, warningString):
"""
Issue a warning string, identifying C{offender} as the responsible code.
This function is used to deprecate some behavior of a function. It differs
from L{warnings.warn} in that it is not limited to deprecating the behavior
of a function currently on the call stack.
@param function: The function that is being deprecated.
@param warningString: The string that should be emitted by this warning.
@type warningString: C{str}
@since: 11.0
"""
# inspect.getmodule() is attractive, but somewhat
# broken in Python < 2.6. See Python bug 4845.
offenderModule = sys.modules[offender.__module__]
filename = inspect.getabsfile(offenderModule)
lineStarts = list(findlinestarts(offender.__code__))
lastLineNo = lineStarts[-1][1]
globals = offender.__globals__
kwargs = dict(
category=DeprecationWarning,
filename=filename,
lineno=lastLineNo,
module=offenderModule.__name__,
registry=globals.setdefault("__warningregistry__", {}),
module_globals=None)
warn_explicit(warningString, **kwargs)
|