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annotate lib/python3.8/site-packages/pip/_vendor/distlib/resources.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2013-2017 Vinay Sajip.
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4 # Licensed to the Python Software Foundation under a contributor agreement.
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5 # See LICENSE.txt and CONTRIBUTORS.txt.
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6 #
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7 from __future__ import unicode_literals
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8
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9 import bisect
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10 import io
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11 import logging
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12 import os
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13 import pkgutil
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14 import shutil
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15 import sys
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16 import types
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17 import zipimport
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18
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19 from . import DistlibException
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20 from .util import cached_property, get_cache_base, path_to_cache_dir, Cache
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21
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22 logger = logging.getLogger(__name__)
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23
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24
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25 cache = None # created when needed
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26
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27
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28 class ResourceCache(Cache):
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29 def __init__(self, base=None):
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30 if base is None:
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31 # Use native string to avoid issues on 2.x: see Python #20140.
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32 base = os.path.join(get_cache_base(), str('resource-cache'))
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33 super(ResourceCache, self).__init__(base)
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34
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35 def is_stale(self, resource, path):
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36 """
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37 Is the cache stale for the given resource?
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38
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39 :param resource: The :class:`Resource` being cached.
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40 :param path: The path of the resource in the cache.
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41 :return: True if the cache is stale.
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42 """
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43 # Cache invalidation is a hard problem :-)
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44 return True
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45
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46 def get(self, resource):
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47 """
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48 Get a resource into the cache,
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49
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50 :param resource: A :class:`Resource` instance.
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51 :return: The pathname of the resource in the cache.
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52 """
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53 prefix, path = resource.finder.get_cache_info(resource)
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54 if prefix is None:
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55 result = path
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56 else:
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57 result = os.path.join(self.base, self.prefix_to_dir(prefix), path)
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58 dirname = os.path.dirname(result)
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59 if not os.path.isdir(dirname):
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60 os.makedirs(dirname)
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61 if not os.path.exists(result):
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62 stale = True
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63 else:
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64 stale = self.is_stale(resource, path)
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65 if stale:
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66 # write the bytes of the resource to the cache location
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67 with open(result, 'wb') as f:
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68 f.write(resource.bytes)
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69 return result
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70
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71
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72 class ResourceBase(object):
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73 def __init__(self, finder, name):
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74 self.finder = finder
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75 self.name = name
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76
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77
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78 class Resource(ResourceBase):
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79 """
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80 A class representing an in-package resource, such as a data file. This is
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81 not normally instantiated by user code, but rather by a
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82 :class:`ResourceFinder` which manages the resource.
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83 """
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84 is_container = False # Backwards compatibility
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85
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86 def as_stream(self):
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87 """
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88 Get the resource as a stream.
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89
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90 This is not a property to make it obvious that it returns a new stream
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91 each time.
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92 """
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93 return self.finder.get_stream(self)
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94
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95 @cached_property
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96 def file_path(self):
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97 global cache
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98 if cache is None:
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99 cache = ResourceCache()
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100 return cache.get(self)
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101
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102 @cached_property
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103 def bytes(self):
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104 return self.finder.get_bytes(self)
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105
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106 @cached_property
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107 def size(self):
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108 return self.finder.get_size(self)
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109
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110
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111 class ResourceContainer(ResourceBase):
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112 is_container = True # Backwards compatibility
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113
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114 @cached_property
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115 def resources(self):
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116 return self.finder.get_resources(self)
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117
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118
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119 class ResourceFinder(object):
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120 """
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121 Resource finder for file system resources.
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122 """
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123
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124 if sys.platform.startswith('java'):
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125 skipped_extensions = ('.pyc', '.pyo', '.class')
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126 else:
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127 skipped_extensions = ('.pyc', '.pyo')
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128
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129 def __init__(self, module):
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diff changeset
130 self.module = module
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diff changeset
131 self.loader = getattr(module, '__loader__', None)
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132 self.base = os.path.dirname(getattr(module, '__file__', ''))
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133
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134 def _adjust_path(self, path):
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diff changeset
135 return os.path.realpath(path)
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diff changeset
136
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137 def _make_path(self, resource_name):
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138 # Issue #50: need to preserve type of path on Python 2.x
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guerler
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139 # like os.path._get_sep
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140 if isinstance(resource_name, bytes): # should only happen on 2.x
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guerler
parents:
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141 sep = b'/'
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142 else:
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143 sep = '/'
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144 parts = resource_name.split(sep)
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145 parts.insert(0, self.base)
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146 result = os.path.join(*parts)
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147 return self._adjust_path(result)
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148
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149 def _find(self, path):
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150 return os.path.exists(path)
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151
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152 def get_cache_info(self, resource):
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153 return None, resource.path
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154
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155 def find(self, resource_name):
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156 path = self._make_path(resource_name)
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157 if not self._find(path):
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158 result = None
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159 else:
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160 if self._is_directory(path):
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161 result = ResourceContainer(self, resource_name)
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162 else:
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163 result = Resource(self, resource_name)
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164 result.path = path
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165 return result
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166
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167 def get_stream(self, resource):
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168 return open(resource.path, 'rb')
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169
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170 def get_bytes(self, resource):
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171 with open(resource.path, 'rb') as f:
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172 return f.read()
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173
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174 def get_size(self, resource):
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175 return os.path.getsize(resource.path)
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176
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177 def get_resources(self, resource):
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178 def allowed(f):
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179 return (f != '__pycache__' and not
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180 f.endswith(self.skipped_extensions))
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181 return set([f for f in os.listdir(resource.path) if allowed(f)])
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182
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183 def is_container(self, resource):
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184 return self._is_directory(resource.path)
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185
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186 _is_directory = staticmethod(os.path.isdir)
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187
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188 def iterator(self, resource_name):
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189 resource = self.find(resource_name)
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190 if resource is not None:
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191 todo = [resource]
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192 while todo:
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193 resource = todo.pop(0)
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194 yield resource
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195 if resource.is_container:
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196 rname = resource.name
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197 for name in resource.resources:
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198 if not rname:
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199 new_name = name
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200 else:
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201 new_name = '/'.join([rname, name])
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202 child = self.find(new_name)
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diff changeset
203 if child.is_container:
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204 todo.append(child)
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205 else:
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guerler
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206 yield child
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207
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208
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209 class ZipResourceFinder(ResourceFinder):
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210 """
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211 Resource finder for resources in .zip files.
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212 """
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213 def __init__(self, module):
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214 super(ZipResourceFinder, self).__init__(module)
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215 archive = self.loader.archive
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216 self.prefix_len = 1 + len(archive)
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217 # PyPy doesn't have a _files attr on zipimporter, and you can't set one
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218 if hasattr(self.loader, '_files'):
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219 self._files = self.loader._files
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220 else:
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221 self._files = zipimport._zip_directory_cache[archive]
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222 self.index = sorted(self._files)
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223
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224 def _adjust_path(self, path):
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225 return path
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226
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227 def _find(self, path):
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228 path = path[self.prefix_len:]
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diff changeset
229 if path in self._files:
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230 result = True
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231 else:
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guerler
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232 if path and path[-1] != os.sep:
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233 path = path + os.sep
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parents:
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234 i = bisect.bisect(self.index, path)
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guerler
parents:
diff changeset
235 try:
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236 result = self.index[i].startswith(path)
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guerler
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237 except IndexError:
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238 result = False
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
parents:
diff changeset
239 if not result:
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diff changeset
240 logger.debug('_find failed: %r %r', path, self.loader.prefix)
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guerler
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diff changeset
241 else:
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diff changeset
242 logger.debug('_find worked: %r %r', path, self.loader.prefix)
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243 return result
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244
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245 def get_cache_info(self, resource):
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246 prefix = self.loader.archive
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247 path = resource.path[1 + len(prefix):]
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248 return prefix, path
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249
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250 def get_bytes(self, resource):
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251 return self.loader.get_data(resource.path)
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252
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253 def get_stream(self, resource):
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254 return io.BytesIO(self.get_bytes(resource))
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255
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256 def get_size(self, resource):
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257 path = resource.path[self.prefix_len:]
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guerler
parents:
diff changeset
258 return self._files[path][3]
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parents:
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259
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260 def get_resources(self, resource):
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261 path = resource.path[self.prefix_len:]
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262 if path and path[-1] != os.sep:
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263 path += os.sep
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264 plen = len(path)
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265 result = set()
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266 i = bisect.bisect(self.index, path)
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267 while i < len(self.index):
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268 if not self.index[i].startswith(path):
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269 break
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270 s = self.index[i][plen:]
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271 result.add(s.split(os.sep, 1)[0]) # only immediate children
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272 i += 1
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273 return result
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274
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275 def _is_directory(self, path):
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276 path = path[self.prefix_len:]
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277 if path and path[-1] != os.sep:
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guerler
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278 path += os.sep
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279 i = bisect.bisect(self.index, path)
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280 try:
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281 result = self.index[i].startswith(path)
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282 except IndexError:
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283 result = False
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284 return result
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285
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286 _finder_registry = {
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287 type(None): ResourceFinder,
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288 zipimport.zipimporter: ZipResourceFinder
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289 }
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290
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291 try:
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292 # In Python 3.6, _frozen_importlib -> _frozen_importlib_external
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293 try:
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294 import _frozen_importlib_external as _fi
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295 except ImportError:
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296 import _frozen_importlib as _fi
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297 _finder_registry[_fi.SourceFileLoader] = ResourceFinder
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298 _finder_registry[_fi.FileFinder] = ResourceFinder
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guerler
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299 del _fi
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300 except (ImportError, AttributeError):
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301 pass
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302
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303
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304 def register_finder(loader, finder_maker):
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305 _finder_registry[type(loader)] = finder_maker
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306
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307 _finder_cache = {}
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308
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309
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310 def finder(package):
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311 """
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312 Return a resource finder for a package.
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313 :param package: The name of the package.
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314 :return: A :class:`ResourceFinder` instance for the package.
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315 """
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316 if package in _finder_cache:
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317 result = _finder_cache[package]
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318 else:
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319 if package not in sys.modules:
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320 __import__(package)
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321 module = sys.modules[package]
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322 path = getattr(module, '__path__', None)
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guerler
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323 if path is None:
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324 raise DistlibException('You cannot get a finder for a module, '
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
guerler
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325 'only for a package')
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326 loader = getattr(module, '__loader__', None)
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327 finder_maker = _finder_registry.get(type(loader))
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328 if finder_maker is None:
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329 raise DistlibException('Unable to locate finder for %r' % package)
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330 result = finder_maker(module)
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331 _finder_cache[package] = result
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guerler
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332 return result
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guerler
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diff changeset
333
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guerler
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334
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guerler
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335 _dummy_module = types.ModuleType(str('__dummy__'))
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guerler
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336
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guerler
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diff changeset
337
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guerler
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338 def finder_for_path(path):
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guerler
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339 """
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guerler
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340 Return a resource finder for a path, which should represent a container.
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guerler
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341
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342 :param path: The path.
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343 :return: A :class:`ResourceFinder` instance for the path.
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guerler
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344 """
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345 result = None
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346 # calls any path hooks, gets importer into cache
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guerler
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347 pkgutil.get_importer(path)
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guerler
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348 loader = sys.path_importer_cache.get(path)
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guerler
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349 finder = _finder_registry.get(type(loader))
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guerler
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diff changeset
350 if finder:
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guerler
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351 module = _dummy_module
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guerler
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352 module.__file__ = os.path.join(path, '')
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guerler
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353 module.__loader__ = loader
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354 result = finder(module)
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355 return result