Mercurial > hg
annotate mercurial/demandimport.py @ 26478:a3f7e5461dbd
util.chunkbuffer: special case reading everything
The new code results in simpler logic within the while loop. It is also
faster since we avoid performing operations on the queue and buf
collections. However, there shouldn't be any super hot loops for this
since the whole point of chunkbuffer is to avoid reading large amounts
of data at once. This does, however, make it easier to optimize
chunkbuffer in a subsequent patch.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 05 Oct 2015 16:28:12 -0700 |
parents | 7e81305092a0 |
children | 65387a30430e |
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1 # demandimport.py - global demand-loading of modules for Mercurial |
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2 # |
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3 # Copyright 2006, 2007 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
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8 ''' |
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9 demandimport - automatic demandloading of modules |
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10 |
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11 To enable this module, do: |
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12 |
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13 import demandimport; demandimport.enable() |
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14 |
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15 Imports of the following forms will be demand-loaded: |
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16 |
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17 import a, b.c |
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18 import a.b as c |
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19 from a import b,c # a will be loaded immediately |
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20 |
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21 These imports will not be delayed: |
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22 |
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23 from a import * |
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24 b = __import__(a) |
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25 ''' |
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26 |
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27 from __future__ import absolute_import |
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28 |
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29 import contextlib |
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30 import os |
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31 import sys |
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32 |
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33 # __builtin__ in Python 2, builtins in Python 3. |
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34 try: |
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35 import __builtin__ as builtins |
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36 except ImportError: |
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37 import builtins |
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38 |
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39 contextmanager = contextlib.contextmanager |
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40 |
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41 _origimport = __import__ |
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42 |
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43 nothing = object() |
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44 |
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45 # Python 3 doesn't have relative imports nor level -1. |
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46 level = -1 |
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47 if sys.version_info[0] >= 3: |
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48 level = 0 |
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49 _import = _origimport |
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50 |
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51 def _hgextimport(importfunc, name, globals, *args, **kwargs): |
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52 try: |
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53 return importfunc(name, globals, *args, **kwargs) |
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54 except ImportError: |
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55 if not globals: |
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56 raise |
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57 # extensions are loaded with "hgext_" prefix |
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58 hgextname = 'hgext_%s' % name |
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59 nameroot = hgextname.split('.', 1)[0] |
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60 contextroot = globals.get('__name__', '').split('.', 1)[0] |
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61 if nameroot != contextroot: |
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62 raise |
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63 # retry to import with "hgext_" prefix |
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64 return importfunc(hgextname, globals, *args, **kwargs) |
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65 |
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66 class _demandmod(object): |
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67 """module demand-loader and proxy""" |
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68 def __init__(self, name, globals, locals, level=level): |
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69 if '.' in name: |
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70 head, rest = name.split('.', 1) |
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71 after = [rest] |
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72 else: |
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73 head = name |
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74 after = [] |
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75 object.__setattr__(self, "_data", |
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76 (head, globals, locals, after, level, set())) |
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77 object.__setattr__(self, "_module", None) |
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78 def _extend(self, name): |
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79 """add to the list of submodules to load""" |
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80 self._data[3].append(name) |
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81 |
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82 def _addref(self, name): |
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83 """Record that the named module ``name`` imports this module. |
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84 |
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85 References to this proxy class having the name of this module will be |
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86 replaced at module load time. We assume the symbol inside the importing |
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87 module is identical to the "head" name of this module. We don't |
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88 actually know if "as X" syntax is being used to change the symbol name |
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89 because this information isn't exposed to __import__. |
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90 """ |
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91 self._data[5].add(name) |
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92 |
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93 def _load(self): |
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94 if not self._module: |
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95 head, globals, locals, after, level, modrefs = self._data |
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96 mod = _hgextimport(_import, head, globals, locals, None, level) |
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97 # load submodules |
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98 def subload(mod, p): |
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99 h, t = p, None |
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100 if '.' in p: |
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101 h, t = p.split('.', 1) |
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102 if getattr(mod, h, nothing) is nothing: |
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103 setattr(mod, h, _demandmod(p, mod.__dict__, mod.__dict__)) |
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104 elif t: |
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105 subload(getattr(mod, h), t) |
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106 |
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107 for x in after: |
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108 subload(mod, x) |
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109 |
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110 # Replace references to this proxy instance with the actual module. |
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111 if locals and locals.get(head) == self: |
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112 locals[head] = mod |
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113 |
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114 for modname in modrefs: |
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115 modref = sys.modules.get(modname, None) |
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116 if modref and getattr(modref, head, None) == self: |
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117 setattr(modref, head, mod) |
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118 |
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119 object.__setattr__(self, "_module", mod) |
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120 |
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121 def __repr__(self): |
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122 if self._module: |
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123 return "<proxied module '%s'>" % self._data[0] |
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124 return "<unloaded module '%s'>" % self._data[0] |
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125 def __call__(self, *args, **kwargs): |
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126 raise TypeError("%s object is not callable" % repr(self)) |
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127 def __getattribute__(self, attr): |
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128 if attr in ('_data', '_extend', '_load', '_module', '_addref'): |
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129 return object.__getattribute__(self, attr) |
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130 self._load() |
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131 return getattr(self._module, attr) |
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132 def __setattr__(self, attr, val): |
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133 self._load() |
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134 setattr(self._module, attr, val) |
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135 |
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136 def _demandimport(name, globals=None, locals=None, fromlist=None, level=level): |
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137 if not locals or name in ignore or fromlist == ('*',): |
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138 # these cases we can't really delay |
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139 return _hgextimport(_import, name, globals, locals, fromlist, level) |
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140 elif not fromlist: |
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141 # import a [as b] |
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142 if '.' in name: # a.b |
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143 base, rest = name.split('.', 1) |
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144 # email.__init__ loading email.mime |
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145 if globals and globals.get('__name__', None) == base: |
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146 return _import(name, globals, locals, fromlist, level) |
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147 # if a is already demand-loaded, add b to its submodule list |
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148 if base in locals: |
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149 if isinstance(locals[base], _demandmod): |
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150 locals[base]._extend(rest) |
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151 return locals[base] |
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152 return _demandmod(name, globals, locals, level) |
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153 else: |
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154 # There is a fromlist. |
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155 # from a import b,c,d |
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156 # from . import b,c,d |
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157 # from .a import b,c,d |
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158 |
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159 # level == -1: relative and absolute attempted (Python 2 only). |
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160 # level >= 0: absolute only (Python 2 w/ absolute_import and Python 3). |
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161 # The modern Mercurial convention is to use absolute_import everywhere, |
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162 # so modern Mercurial code will have level >= 0. |
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163 |
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164 # The name of the module the import statement is located in. |
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165 globalname = globals.get('__name__') |
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166 |
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167 def processfromitem(mod, attr, **kwargs): |
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168 """Process an imported symbol in the import statement. |
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169 |
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170 If the symbol doesn't exist in the parent module, it must be a |
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171 module. We set missing modules up as _demandmod instances. |
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172 """ |
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173 symbol = getattr(mod, attr, nothing) |
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174 if symbol is nothing: |
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175 symbol = _demandmod(attr, mod.__dict__, locals, **kwargs) |
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176 setattr(mod, attr, symbol) |
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177 |
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178 # Record the importing module references this symbol so we can |
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179 # replace the symbol with the actual module instance at load |
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180 # time. |
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181 if globalname and isinstance(symbol, _demandmod): |
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182 symbol._addref(globalname) |
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183 |
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184 if level >= 0: |
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185 # Mercurial's enforced import style does not use |
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186 # "from a import b,c,d" or "from .a import b,c,d" syntax. In |
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187 # addition, this appears to be giving errors with some modules |
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188 # for unknown reasons. Since we shouldn't be using this syntax |
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189 # much, work around the problems. |
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190 if name: |
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191 return _hgextimport(_origimport, name, globals, locals, |
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192 fromlist, level) |
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193 |
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194 mod = _hgextimport(_origimport, name, globals, locals, level=level) |
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195 |
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196 for x in fromlist: |
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197 processfromitem(mod, x, level=level) |
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198 |
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199 return mod |
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200 |
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201 # But, we still need to support lazy loading of standard library and 3rd |
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202 # party modules. So handle level == -1. |
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203 mod = _hgextimport(_origimport, name, globals, locals) |
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204 # recurse down the module chain |
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205 for comp in name.split('.')[1:]: |
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206 if getattr(mod, comp, nothing) is nothing: |
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207 setattr(mod, comp, |
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208 _demandmod(comp, mod.__dict__, mod.__dict__)) |
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209 mod = getattr(mod, comp) |
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210 |
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211 for x in fromlist: |
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212 processfromitem(mod, x) |
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213 |
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214 return mod |
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215 |
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216 ignore = [ |
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217 '__future__', |
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218 '_hashlib', |
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219 '_xmlplus', |
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220 'fcntl', |
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221 'win32com.gen_py', |
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222 '_winreg', # 2.7 mimetypes needs immediate ImportError |
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223 'pythoncom', |
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224 # imported by tarfile, not available under Windows |
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225 'pwd', |
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226 'grp', |
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227 # imported by profile, itself imported by hotshot.stats, |
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228 # not available under Windows |
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229 'resource', |
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231 'gtk', | |
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232 # setuptools' pkg_resources.py expects "from __main__ import x" to |
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233 # raise ImportError if x not defined |
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234 '__main__', |
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235 '_ssl', # conditional imports in the stdlib, issue1964 |
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236 'rfc822', |
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237 'mimetools', |
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238 # setuptools 8 expects this module to explode early when not on windows |
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demandimport: blacklist distutils.msvc9compiler (issue4475)
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239 'distutils.msvc9compiler' |
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demandimport: ignore resource module, not available under Windows.
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240 ] |
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241 |
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hooks: only disable/re-enable demandimport when it's already enabled
Brodie Rao <brodie@sf.io>
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242 def isenabled(): |
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demandimport: alias __builtin__ as builtins
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243 return builtins.__import__ == _demandimport |
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244 |
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245 def enable(): |
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246 "enable global demand-loading of modules" |
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demandimport: make it possible to disable by setting HGDEMANDIMPORT=disable
Mads Kiilerich <madski@unity3d.com>
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247 if os.environ.get('HGDEMANDIMPORT') != 'disable': |
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248 builtins.__import__ = _demandimport |
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249 |
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250 def disable(): |
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251 "disable global demand-loading of modules" |
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252 builtins.__import__ = _origimport |
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demandimport: define a `deactivated` context manager
Jordi Gutiérrez Hermoso <jordigh@octave.org>
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253 |
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254 @contextmanager |
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255 def deactivated(): |
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256 "context manager for disabling demandimport in 'with' blocks" |
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257 demandenabled = isenabled() |
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258 if demandenabled: |
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259 disable() |
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260 |
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261 try: |
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262 yield |
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263 finally: |
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264 if demandenabled: |
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265 enable() |