Mercurial > ~astiob > upreckon > hgweb
annotate compat.py @ 80:809b77302b21
Win32-specific module with memory and CPU time limits
The Win32-specific implementation of call() and friends now lives
in module win32, looks clean and in addition is able to enforce memory
and CPU time limits on NT kernels, in particular on Windows 2000 and up
asking the system to terminate the process as soon as or (in the case
of CPU time) almost as soon as the limits are broken. According to my
observations, malloc() in the limited process does not return NULL
when memory usage is close to the limit and instead crashes the process
(which Upreckon happily translates into 'memory limit exceeded').
The catch is that the module is not actually used yet; coming soon.
| author | Oleg Oshmyan <chortos@inbox.lv> |
|---|---|
| date | Wed, 16 Feb 2011 00:01:33 +0000 |
| parents | d46bd7ee3e69 |
| children | cd347cfca272 |
| rev | line source |
|---|---|
| 21 | 1 #! /usr/bin/env python |
| 78 | 2 # Copyright (c) 2010-2011 Chortos-2 <chortos@inbox.lv> |
| 16 | 3 |
| 21 | 4 # A compatibility layer for Python 2.5+. This is what lets test.py |
| 5 # run on all versions of Python starting with 2.5, including Python 3. | |
| 6 | |
| 7 # A few notes regarding some compatibility-driven peculiarities | |
| 8 # in the use of the language that can be seen in all modules: | |
| 9 # | |
| 10 # * Except statements never specify target; instead, when needed, | |
| 11 # the exception is taken from sys.exc_info(). Blame the incompatible | |
| 12 # syntaxes of the except clause in Python 2.5 and Python 3 and the lack | |
| 13 # of preprocessor macros in Python of any version ;P. | |
| 14 # | |
| 15 # * Keyword-only parameters are never used, even for parameters | |
| 16 # that should never be given in as arguments. The reason is | |
| 17 # the laziness of some Python developers who have failed to finish | |
| 18 # implementing them in Python 2 even though they had several years | |
| 19 # of time and multiple version releases to sneak them in. | |
| 20 # | |
| 21 # * Abstract classes are only implemented for Python 2.6 and 2.7. | |
| 22 # ABC's require the abc module and the specification of metaclasses, | |
| 23 # but in Python 2.5, the abc module does not exist, while in Python 3, | |
| 24 # metaclasses are specified using a syntax totally incompatible | |
| 25 # with Python 2 and not usable conditionally via exec() and such | |
| 26 # because it is a detail of the syntax of the class statement itself. | |
| 27 | |
|
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28 # Some code was adapted from Python 2.7.1 and its documentation. |
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29 # This code is clearly marked as such in preceding comments and is |
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30 # covered by copyright as follows: |
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31 # |
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32 # Copyright (c) 2001-2010 Python Software Foundation; all rights reserved. |
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33 # |
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34 # The code is used according to the PSF License Agreement |
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35 # for Python 2.7.1, whose full text is available from your local |
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36 # installation of Python (enter 'license()' in the interactive |
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37 # interpreter) or from the Web at the following URL: |
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38 # |
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39 # http://docs.python.org/2.7.1/license.html#terms-and-conditions-for-accessing-or-otherwise-using-python |
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40 |
| 27 | 41 try: |
| 42 import builtins | |
| 43 except ImportError: | |
| 44 import __builtin__ as builtins | |
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45 |
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46 pseudobuiltins = ('say', 'basestring', 'range', 'map', 'zip', 'filter', 'next', |
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47 'items', 'keys', 'values', 'zip_longest', 'callable', 'ceil') |
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48 __all__ = pseudobuiltins + ('ABCMeta', 'abstractmethod', 'CompatBuiltins') |
| 21 | 49 |
| 16 | 50 try: |
| 51 # Python 3 | |
| 52 exec('say = print') | |
| 53 except SyntaxError: | |
| 54 try: | |
| 55 # Python 2.6/2.7 | |
| 21 | 56 # An alternative is exec('from __future__ import print_function; say = print'); |
| 57 # if problems arise with the current line, one should try replacing it | |
| 58 # with this one with the future import before abandoning the idea altogether | |
| 27 | 59 say = getattr(builtins, 'print') |
| 16 | 60 except Exception: |
| 61 # Python 2.5 | |
| 62 import sys | |
| 63 # This should fully emulate the print function of Python 2.6 in Python 2.3+ | |
| 21 | 64 # The error messages are taken from Python 2.6 |
| 65 # The name bindings at the bottom of this file are in effect | |
| 16 | 66 def saytypeerror(value, name): |
| 21 | 67 return TypeError(' '.join((name, 'must be None, str or unicode, not', type(value).__name__))) |
| 16 | 68 def say(*values, **kwargs): |
| 69 sep = kwargs.pop('sep' , None) | |
| 70 end = kwargs.pop('end' , None) | |
| 71 file = kwargs.pop('file', None) | |
| 72 if kwargs: raise TypeError("'%s' is an invalid keyword argument for this function" % kwargs.popitem()[0]) | |
| 73 if sep is None: sep = ' ' | |
| 74 if end is None: end = '\n' | |
| 75 if file is None: file = sys.stdout | |
| 76 if not isinstance(sep, basestring): raise saytypeerror(sep, 'sep') | |
| 77 if not isinstance(end, basestring): raise saytypeerror(end, 'end') | |
| 21 | 78 file.write(sep.join(map(str, values)) + end) |
| 16 | 79 |
|
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80 try: |
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81 from os.path import relpath |
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82 except ImportError: |
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83 # Python 2.5 |
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84 import os.path as _path |
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85 |
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86 # Adapted from Python 2.7.1 |
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87 |
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88 if hasattr(_path, 'splitunc'): |
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89 def _abspath_split(path): |
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90 abs = _path.abspath(_path.normpath(path)) |
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91 prefix, rest = _path.splitunc(abs) |
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92 is_unc = bool(prefix) |
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93 if not is_unc: |
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94 prefix, rest = _path.splitdrive(abs) |
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95 return is_unc, prefix, [x for x in rest.split(_path.sep) if x] |
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96 else: |
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97 def _abspath_split(path): |
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98 prefix, rest = _path.splitdrive(_path.abspath(_path.normpath(path))) |
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99 return False, prefix, [x for x in rest.split(_path.sep) if x] |
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100 |
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101 def relpath(path, start=_path.curdir): |
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102 """Return a relative version of a path""" |
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103 |
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104 if not path: |
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105 raise ValueError("no path specified") |
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106 |
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107 start_is_unc, start_prefix, start_list = _abspath_split(start) |
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108 path_is_unc, path_prefix, path_list = _abspath_split(path) |
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109 |
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110 if path_is_unc ^ start_is_unc: |
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111 raise ValueError("Cannot mix UNC and non-UNC paths (%s and %s)" |
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112 % (path, start)) |
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113 if path_prefix.lower() != start_prefix.lower(): |
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114 if path_is_unc: |
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115 raise ValueError("path is on UNC root %s, start on UNC root %s" |
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116 % (path_prefix, start_prefix)) |
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117 else: |
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118 raise ValueError("path is on drive %s, start on drive %s" |
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119 % (path_prefix, start_prefix)) |
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120 # Work out how much of the filepath is shared by start and path. |
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121 i = 0 |
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122 for e1, e2 in zip(start_list, path_list): |
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123 if e1.lower() != e2.lower(): |
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124 break |
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125 i += 1 |
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126 |
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127 rel_list = [_path.pardir] * (len(start_list)-i) + path_list[i:] |
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128 if not rel_list: |
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129 return _path.curdir |
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130 return _path.join(*rel_list) |
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131 |
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132 _path.relpath = relpath |
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133 |
| 16 | 134 def import_urllib(): |
| 135 try: | |
| 136 # Python 3 | |
| 137 import urllib.request | |
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138 return urllib.request, lambda url: urllib.request.urlopen(url).read().decode('ascii') |
| 16 | 139 except ImportError: |
| 140 # Python 2 | |
| 141 import urllib | |
| 21 | 142 return urllib, lambda url: urllib.urlopen(url).read() |
| 143 | |
| 144 try: | |
| 145 from abc import ABCMeta, abstractmethod | |
| 146 except ImportError: | |
| 147 ABCMeta, abstractmethod = None, lambda x: x | |
| 148 | |
| 149 try: | |
| 150 basestring = basestring | |
| 151 except NameError: | |
| 152 basestring = str | |
| 153 | |
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154 # xrange is set to support simple testconf.py's written for test.py 1.x |
| 21 | 155 try: |
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156 xrange = range = xrange |
| 21 | 157 except NameError: |
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158 xrange = range = range |
| 21 | 159 |
| 160 try: | |
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161 callable = callable |
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162 except NameError: |
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163 from collections import Callable |
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164 callable = lambda obj: isinstance(obj, Callable) |
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165 |
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166 try: |
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167 next = next |
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168 except NameError: |
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169 next = lambda obj: obj.next() |
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170 |
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171 try: |
| 21 | 172 from itertools import imap as map |
| 173 except ImportError: | |
| 174 map = map | |
| 175 | |
| 176 try: | |
| 177 from itertools import izip as zip | |
| 178 except ImportError: | |
| 179 zip = zip | |
| 180 | |
| 181 try: | |
| 182 from itertools import ifilter as filter | |
| 183 except ImportError: | |
| 184 filter = filter | |
| 185 | |
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186 try: |
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187 items = dict.iteritems |
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188 except AttributeError: |
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189 items = dict.items |
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190 |
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191 try: |
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192 keys = dict.iterkeys |
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193 except AttributeError: |
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194 keys = dict.keys |
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195 |
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196 try: |
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197 values = dict.itervalues |
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198 except AttributeError: |
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199 values = dict.values |
| 21 | 200 |
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201 from math import ceil |
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202 if not isinstance(ceil(0), int): |
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203 def ceil(x): |
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204 y = int(x) |
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205 if y < x: y += 1 |
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206 return y |
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207 |
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208 try: |
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209 # Python 3 |
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210 from itertools import zip_longest |
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211 except ImportError: |
| 31 | 212 try: |
| 213 # Python 2.6/2.7 | |
| 214 from itertools import izip_longest as zip_longest | |
| 215 except ImportError: | |
| 216 # Python 2.5 | |
| 217 from itertools import chain, repeat | |
| 218 # Adapted from the documentation of itertools.izip_longest | |
| 219 def zip_longest(*args, **kwargs): | |
| 220 fillvalue = kwargs.get('fillvalue') | |
| 221 def sentinel(counter=([fillvalue]*(len(args)-1)).pop): | |
| 222 yield counter() | |
| 223 fillers = repeat(fillvalue) | |
| 224 iters = [chain(it, sentinel(), fillers) for it in args] | |
| 225 try: | |
| 226 for tup in zip(*iters): | |
| 227 yield tup | |
| 228 except IndexError: | |
| 229 pass | |
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230 |
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231 # Automatically import * from this module into testconf.py's |
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232 class CompatBuiltins(object): |
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233 __slots__ = 'originals' |
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234 globals = globals() |
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235 def __enter__(self): |
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236 self.originals = {} |
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237 for name in pseudobuiltins: |
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238 try: |
| 27 | 239 self.originals[name] = getattr(builtins, name) |
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240 except AttributeError: |
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241 pass |
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242 setattr(builtins, name, self.globals[name]) |
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243 return self |
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244 def __exit__(self, exc_type, exc_val, exc_tb): |
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245 for name in self.originals: |
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246 setattr(builtins, name, self.originals[name]) |