Mercurial > hg
annotate hgdemandimport/demandimportpy3.py @ 49845:e0c0545e2e55
branching: merge stable into default
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Wed, 04 Jan 2023 16:02:22 +0100 |
parents | 7236f11db0c3 48e38b179106 |
children | 31bbf7a28a75 |
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1 # demandimportpy3 - global demand-loading of modules for Mercurial |
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2 # |
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3 # Copyright 2017 Facebook Inc. |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 """Lazy loading for Python 3.6 and above. |
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9 |
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10 This uses the new importlib finder/loader functionality available in Python 3.5 |
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11 and up. The code reuses most of the mechanics implemented inside importlib.util, |
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12 but with a few additions: |
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13 |
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14 * Allow excluding certain modules from lazy imports. |
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15 * Expose an interface that's substantially the same as demandimport for |
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16 Python 2. |
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17 |
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18 This also has some limitations compared to the Python 2 implementation: |
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19 |
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20 * Much of the logic is per-package, not per-module, so any packages loaded |
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21 before demandimport is enabled will not be lazily imported in the future. In |
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22 practice, we only expect builtins to be loaded before demandimport is |
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23 enabled. |
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24 """ |
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25 |
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26 import contextlib |
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27 import importlib.util |
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28 import sys |
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29 |
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30 from . import tracing |
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31 |
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32 _deactivated = False |
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33 |
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34 |
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35 class _lazyloaderex(importlib.util.LazyLoader): |
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36 """This is a LazyLoader except it also follows the _deactivated global and |
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37 the ignore list. |
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38 """ |
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39 |
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40 def exec_module(self, module): |
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41 """Make the module load lazily.""" |
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42 with tracing.log('demandimport %s', module): |
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43 if _deactivated or module.__name__ in ignores: |
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44 # Reset the loader on the module as super() does (issue6725) |
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45 module.__spec__.loader = self.loader |
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46 module.__loader__ = self.loader |
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47 |
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48 self.loader.exec_module(module) |
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49 else: |
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50 super().exec_module(module) |
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51 |
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52 |
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53 class LazyFinder: |
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54 """A wrapper around a ``MetaPathFinder`` that makes loaders lazy. |
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55 |
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56 ``sys.meta_path`` finders have their ``find_spec()`` called to locate a |
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57 module. This returns a ``ModuleSpec`` if found or ``None``. The |
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58 ``ModuleSpec`` has a ``loader`` attribute, which is called to actually |
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59 load a module. |
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60 |
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61 Our class wraps an existing finder and overloads its ``find_spec()`` to |
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62 replace the ``loader`` with our lazy loader proxy. |
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63 |
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64 We have to use __getattribute__ to proxy the instance because some meta |
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65 path finders don't support monkeypatching. |
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66 """ |
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67 |
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68 __slots__ = ("_finder",) |
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69 |
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70 def __init__(self, finder): |
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71 object.__setattr__(self, "_finder", finder) |
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72 |
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73 def __repr__(self): |
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74 return "<LazyFinder for %r>" % object.__getattribute__(self, "_finder") |
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75 |
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76 # __bool__ is canonical Python 3. But check-code insists on __nonzero__ being |
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77 # defined via `def`. |
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78 def __nonzero__(self): |
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79 return bool(object.__getattribute__(self, "_finder")) |
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80 |
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81 __bool__ = __nonzero__ |
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82 |
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83 def __getattribute__(self, name): |
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84 if name in ("_finder", "find_spec"): |
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85 return object.__getattribute__(self, name) |
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86 |
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87 return getattr(object.__getattribute__(self, "_finder"), name) |
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88 |
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89 def __delattr__(self, name): |
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90 return delattr(object.__getattribute__(self, "_finder"), name) |
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91 |
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92 def __setattr__(self, name, value): |
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93 return setattr(object.__getattribute__(self, "_finder"), name, value) |
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94 |
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95 def find_spec(self, fullname, path, target=None): |
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96 finder = object.__getattribute__(self, "_finder") |
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97 try: |
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98 find_spec = finder.find_spec |
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99 except AttributeError: |
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100 loader = finder.find_module(fullname, path) |
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101 if loader is None: |
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102 spec = None |
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103 else: |
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104 spec = importlib.util.spec_from_loader(fullname, loader) |
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105 else: |
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106 spec = find_spec(fullname, path, target) |
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107 |
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108 # Lazy loader requires exec_module(). |
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109 if ( |
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110 spec is not None |
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111 and spec.loader is not None |
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112 and getattr(spec.loader, "exec_module", None) |
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113 ): |
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114 spec.loader = _lazyloaderex(spec.loader) |
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115 |
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116 return spec |
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118 |
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119 ignores = set() |
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120 |
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121 |
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122 def init(ignoreset): |
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123 global ignores |
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124 ignores = ignoreset |
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125 |
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126 |
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127 def isenabled(): |
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128 return not _deactivated and any( |
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129 isinstance(finder, LazyFinder) for finder in sys.meta_path |
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130 ) |
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131 |
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132 |
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133 def disable(): |
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134 new_finders = [] |
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135 for finder in sys.meta_path: |
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136 new_finders.append( |
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137 finder._finder if isinstance(finder, LazyFinder) else finder |
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138 ) |
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139 sys.meta_path[:] = new_finders |
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140 |
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141 |
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142 def enable(): |
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143 new_finders = [] |
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144 for finder in sys.meta_path: |
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145 new_finders.append( |
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146 LazyFinder(finder) if not isinstance(finder, LazyFinder) else finder |
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147 ) |
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148 sys.meta_path[:] = new_finders |
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149 |
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150 |
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151 @contextlib.contextmanager |
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152 def deactivated(): |
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153 # This implementation is a bit different from Python 2's. Python 3 |
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154 # maintains a per-package finder cache in sys.path_importer_cache (see |
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155 # PEP 302). This means that we can't just call disable + enable. |
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156 # If we do that, in situations like: |
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157 # |
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158 # demandimport.enable() |
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159 # ... |
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160 # from foo.bar import mod1 |
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161 # with demandimport.deactivated(): |
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162 # from foo.bar import mod2 |
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163 # |
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164 # mod2 will be imported lazily. (The converse also holds -- whatever finder |
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165 # first gets cached will be used.) |
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166 # |
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167 # Instead, have a global flag the LazyLoader can use. |
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168 global _deactivated |
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169 demandenabled = isenabled() |
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170 if demandenabled: |
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171 _deactivated = True |
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172 try: |
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173 yield |
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174 finally: |
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175 if demandenabled: |
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176 _deactivated = False |