Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/pip/_internal/cache.py @ 4:79f47841a781 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
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1 """Cache Management
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2 """
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3
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4 # The following comment should be removed at some point in the future.
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5 # mypy: strict-optional=False
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6
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7 import hashlib
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8 import json
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9 import logging
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10 import os
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11
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12 from pip._vendor.packaging.tags import interpreter_name, interpreter_version
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13 from pip._vendor.packaging.utils import canonicalize_name
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14
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15 from pip._internal.exceptions import InvalidWheelFilename
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16 from pip._internal.models.link import Link
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17 from pip._internal.models.wheel import Wheel
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18 from pip._internal.utils.temp_dir import TempDirectory, tempdir_kinds
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19 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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20 from pip._internal.utils.urls import path_to_url
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21
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22 if MYPY_CHECK_RUNNING:
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23 from typing import Optional, Set, List, Any, Dict
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24
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25 from pip._vendor.packaging.tags import Tag
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26
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27 from pip._internal.models.format_control import FormatControl
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28
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29 logger = logging.getLogger(__name__)
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30
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31
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32 def _hash_dict(d):
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33 # type: (Dict[str, str]) -> str
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34 """Return a stable sha224 of a dictionary."""
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35 s = json.dumps(d, sort_keys=True, separators=(",", ":"), ensure_ascii=True)
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36 return hashlib.sha224(s.encode("ascii")).hexdigest()
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37
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38
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39 class Cache(object):
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40 """An abstract class - provides cache directories for data from links
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41
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42
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43 :param cache_dir: The root of the cache.
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44 :param format_control: An object of FormatControl class to limit
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45 binaries being read from the cache.
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46 :param allowed_formats: which formats of files the cache should store.
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47 ('binary' and 'source' are the only allowed values)
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48 """
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49
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50 def __init__(self, cache_dir, format_control, allowed_formats):
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51 # type: (str, FormatControl, Set[str]) -> None
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52 super(Cache, self).__init__()
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53 assert not cache_dir or os.path.isabs(cache_dir)
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54 self.cache_dir = cache_dir or None
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55 self.format_control = format_control
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56 self.allowed_formats = allowed_formats
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57
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58 _valid_formats = {"source", "binary"}
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59 assert self.allowed_formats.union(_valid_formats) == _valid_formats
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60
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61 def _get_cache_path_parts_legacy(self, link):
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62 # type: (Link) -> List[str]
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63 """Get parts of part that must be os.path.joined with cache_dir
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64
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65 Legacy cache key (pip < 20) for compatibility with older caches.
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66 """
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67
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68 # We want to generate an url to use as our cache key, we don't want to
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69 # just re-use the URL because it might have other items in the fragment
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70 # and we don't care about those.
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71 key_parts = [link.url_without_fragment]
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72 if link.hash_name is not None and link.hash is not None:
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73 key_parts.append("=".join([link.hash_name, link.hash]))
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74 key_url = "#".join(key_parts)
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75
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76 # Encode our key url with sha224, we'll use this because it has similar
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77 # security properties to sha256, but with a shorter total output (and
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78 # thus less secure). However the differences don't make a lot of
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79 # difference for our use case here.
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80 hashed = hashlib.sha224(key_url.encode()).hexdigest()
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81
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82 # We want to nest the directories some to prevent having a ton of top
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83 # level directories where we might run out of sub directories on some
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84 # FS.
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85 parts = [hashed[:2], hashed[2:4], hashed[4:6], hashed[6:]]
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86
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87 return parts
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88
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89 def _get_cache_path_parts(self, link):
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90 # type: (Link) -> List[str]
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91 """Get parts of part that must be os.path.joined with cache_dir
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92 """
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93
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94 # We want to generate an url to use as our cache key, we don't want to
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95 # just re-use the URL because it might have other items in the fragment
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96 # and we don't care about those.
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97 key_parts = {"url": link.url_without_fragment}
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98 if link.hash_name is not None and link.hash is not None:
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99 key_parts[link.hash_name] = link.hash
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100 if link.subdirectory_fragment:
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101 key_parts["subdirectory"] = link.subdirectory_fragment
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102
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103 # Include interpreter name, major and minor version in cache key
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104 # to cope with ill-behaved sdists that build a different wheel
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105 # depending on the python version their setup.py is being run on,
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106 # and don't encode the difference in compatibility tags.
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107 # https://github.com/pypa/pip/issues/7296
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108 key_parts["interpreter_name"] = interpreter_name()
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109 key_parts["interpreter_version"] = interpreter_version()
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110
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111 # Encode our key url with sha224, we'll use this because it has similar
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112 # security properties to sha256, but with a shorter total output (and
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113 # thus less secure). However the differences don't make a lot of
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114 # difference for our use case here.
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115 hashed = _hash_dict(key_parts)
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116
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117 # We want to nest the directories some to prevent having a ton of top
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118 # level directories where we might run out of sub directories on some
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119 # FS.
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120 parts = [hashed[:2], hashed[2:4], hashed[4:6], hashed[6:]]
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121
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122 return parts
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123
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124 def _get_candidates(self, link, canonical_package_name):
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125 # type: (Link, Optional[str]) -> List[Any]
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126 can_not_cache = (
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127 not self.cache_dir or
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128 not canonical_package_name or
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129 not link
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130 )
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131 if can_not_cache:
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132 return []
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133
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134 formats = self.format_control.get_allowed_formats(
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135 canonical_package_name
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136 )
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137 if not self.allowed_formats.intersection(formats):
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138 return []
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139
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140 candidates = []
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141 path = self.get_path_for_link(link)
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142 if os.path.isdir(path):
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143 for candidate in os.listdir(path):
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144 candidates.append((candidate, path))
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145 # TODO remove legacy path lookup in pip>=21
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146 legacy_path = self.get_path_for_link_legacy(link)
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147 if os.path.isdir(legacy_path):
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148 for candidate in os.listdir(legacy_path):
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149 candidates.append((candidate, legacy_path))
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150 return candidates
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151
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152 def get_path_for_link_legacy(self, link):
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153 # type: (Link) -> str
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154 raise NotImplementedError()
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155
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156 def get_path_for_link(self, link):
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157 # type: (Link) -> str
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158 """Return a directory to store cached items in for link.
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159 """
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160 raise NotImplementedError()
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161
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162 def get(
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163 self,
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164 link, # type: Link
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165 package_name, # type: Optional[str]
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166 supported_tags, # type: List[Tag]
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167 ):
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168 # type: (...) -> Link
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169 """Returns a link to a cached item if it exists, otherwise returns the
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170 passed link.
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171 """
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172 raise NotImplementedError()
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173
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174
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175 class SimpleWheelCache(Cache):
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176 """A cache of wheels for future installs.
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177 """
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178
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179 def __init__(self, cache_dir, format_control):
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180 # type: (str, FormatControl) -> None
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181 super(SimpleWheelCache, self).__init__(
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182 cache_dir, format_control, {"binary"}
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183 )
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184
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185 def get_path_for_link_legacy(self, link):
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186 # type: (Link) -> str
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187 parts = self._get_cache_path_parts_legacy(link)
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188 return os.path.join(self.cache_dir, "wheels", *parts)
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189
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190 def get_path_for_link(self, link):
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191 # type: (Link) -> str
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192 """Return a directory to store cached wheels for link
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193
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194 Because there are M wheels for any one sdist, we provide a directory
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195 to cache them in, and then consult that directory when looking up
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196 cache hits.
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197
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198 We only insert things into the cache if they have plausible version
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199 numbers, so that we don't contaminate the cache with things that were
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200 not unique. E.g. ./package might have dozens of installs done for it
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201 and build a version of 0.0...and if we built and cached a wheel, we'd
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202 end up using the same wheel even if the source has been edited.
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203
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204 :param link: The link of the sdist for which this will cache wheels.
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205 """
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206 parts = self._get_cache_path_parts(link)
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207
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208 # Store wheels within the root cache_dir
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209 return os.path.join(self.cache_dir, "wheels", *parts)
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210
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211 def get(
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212 self,
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213 link, # type: Link
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214 package_name, # type: Optional[str]
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215 supported_tags, # type: List[Tag]
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216 ):
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217 # type: (...) -> Link
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218 candidates = []
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219
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220 if not package_name:
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221 return link
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222
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223 canonical_package_name = canonicalize_name(package_name)
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224 for wheel_name, wheel_dir in self._get_candidates(
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225 link, canonical_package_name
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226 ):
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227 try:
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228 wheel = Wheel(wheel_name)
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229 except InvalidWheelFilename:
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230 continue
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231 if canonicalize_name(wheel.name) != canonical_package_name:
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232 logger.debug(
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233 "Ignoring cached wheel {} for {} as it "
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234 "does not match the expected distribution name {}.".format(
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235 wheel_name, link, package_name
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236 )
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237 )
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238 continue
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239 if not wheel.supported(supported_tags):
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240 # Built for a different python/arch/etc
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241 continue
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242 candidates.append(
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243 (
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244 wheel.support_index_min(supported_tags),
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245 wheel_name,
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246 wheel_dir,
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247 )
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248 )
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249
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250 if not candidates:
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251 return link
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252
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253 _, wheel_name, wheel_dir = min(candidates)
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254 return Link(path_to_url(os.path.join(wheel_dir, wheel_name)))
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255
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256
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257 class EphemWheelCache(SimpleWheelCache):
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258 """A SimpleWheelCache that creates it's own temporary cache directory
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259 """
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260
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261 def __init__(self, format_control):
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262 # type: (FormatControl) -> None
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263 self._temp_dir = TempDirectory(
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264 kind=tempdir_kinds.EPHEM_WHEEL_CACHE,
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265 globally_managed=True,
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266 )
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267
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268 super(EphemWheelCache, self).__init__(
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269 self._temp_dir.path, format_control
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270 )
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271
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272
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273 class CacheEntry(object):
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274 def __init__(
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275 self,
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276 link, # type: Link
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277 persistent, # type: bool
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278 ):
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279 self.link = link
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280 self.persistent = persistent
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281
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282
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283 class WheelCache(Cache):
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284 """Wraps EphemWheelCache and SimpleWheelCache into a single Cache
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285
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286 This Cache allows for gracefully degradation, using the ephem wheel cache
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287 when a certain link is not found in the simple wheel cache first.
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288 """
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289
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290 def __init__(self, cache_dir, format_control):
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291 # type: (str, FormatControl) -> None
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292 super(WheelCache, self).__init__(
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293 cache_dir, format_control, {'binary'}
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294 )
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295 self._wheel_cache = SimpleWheelCache(cache_dir, format_control)
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296 self._ephem_cache = EphemWheelCache(format_control)
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297
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298 def get_path_for_link_legacy(self, link):
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299 # type: (Link) -> str
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300 return self._wheel_cache.get_path_for_link_legacy(link)
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301
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302 def get_path_for_link(self, link):
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303 # type: (Link) -> str
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304 return self._wheel_cache.get_path_for_link(link)
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305
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306 def get_ephem_path_for_link(self, link):
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307 # type: (Link) -> str
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308 return self._ephem_cache.get_path_for_link(link)
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309
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310 def get(
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311 self,
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312 link, # type: Link
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313 package_name, # type: Optional[str]
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314 supported_tags, # type: List[Tag]
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315 ):
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316 # type: (...) -> Link
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317 cache_entry = self.get_cache_entry(link, package_name, supported_tags)
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318 if cache_entry is None:
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319 return link
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320 return cache_entry.link
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321
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322 def get_cache_entry(
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323 self,
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324 link, # type: Link
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325 package_name, # type: Optional[str]
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326 supported_tags, # type: List[Tag]
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327 ):
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328 # type: (...) -> Optional[CacheEntry]
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329 """Returns a CacheEntry with a link to a cached item if it exists or
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330 None. The cache entry indicates if the item was found in the persistent
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331 or ephemeral cache.
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332 """
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333 retval = self._wheel_cache.get(
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334 link=link,
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335 package_name=package_name,
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336 supported_tags=supported_tags,
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337 )
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338 if retval is not link:
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339 return CacheEntry(retval, persistent=True)
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340
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341 retval = self._ephem_cache.get(
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342 link=link,
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343 package_name=package_name,
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344 supported_tags=supported_tags,
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345 )
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346 if retval is not link:
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347 return CacheEntry(retval, persistent=False)
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348
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349 return None