Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/pip/_internal/cache.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 """Cache Management |
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2 """ |
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3 |
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4 import hashlib |
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5 import json |
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6 import logging |
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7 import os |
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8 |
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9 from pip._vendor.packaging.tags import interpreter_name, interpreter_version |
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10 from pip._vendor.packaging.utils import canonicalize_name |
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11 |
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12 from pip._internal.exceptions import InvalidWheelFilename |
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13 from pip._internal.models.link import Link |
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14 from pip._internal.models.wheel import Wheel |
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15 from pip._internal.utils.temp_dir import TempDirectory, tempdir_kinds |
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16 from pip._internal.utils.typing import MYPY_CHECK_RUNNING |
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17 from pip._internal.utils.urls import path_to_url |
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18 |
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19 if MYPY_CHECK_RUNNING: |
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20 from typing import Any, Dict, List, Optional, Set |
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21 |
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22 from pip._vendor.packaging.tags import Tag |
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23 |
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24 from pip._internal.models.format_control import FormatControl |
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25 |
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26 logger = logging.getLogger(__name__) |
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27 |
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28 |
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29 def _hash_dict(d): |
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30 # type: (Dict[str, str]) -> str |
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31 """Return a stable sha224 of a dictionary.""" |
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32 s = json.dumps(d, sort_keys=True, separators=(",", ":"), ensure_ascii=True) |
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33 return hashlib.sha224(s.encode("ascii")).hexdigest() |
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34 |
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35 |
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36 class Cache: |
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37 """An abstract class - provides cache directories for data from links |
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38 |
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39 |
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40 :param cache_dir: The root of the cache. |
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41 :param format_control: An object of FormatControl class to limit |
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42 binaries being read from the cache. |
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43 :param allowed_formats: which formats of files the cache should store. |
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44 ('binary' and 'source' are the only allowed values) |
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45 """ |
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46 |
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47 def __init__(self, cache_dir, format_control, allowed_formats): |
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48 # type: (str, FormatControl, Set[str]) -> None |
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49 super().__init__() |
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50 assert not cache_dir or os.path.isabs(cache_dir) |
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51 self.cache_dir = cache_dir or None |
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52 self.format_control = format_control |
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53 self.allowed_formats = allowed_formats |
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54 |
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55 _valid_formats = {"source", "binary"} |
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56 assert self.allowed_formats.union(_valid_formats) == _valid_formats |
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57 |
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58 def _get_cache_path_parts(self, link): |
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59 # type: (Link) -> List[str] |
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60 """Get parts of part that must be os.path.joined with cache_dir |
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61 """ |
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62 |
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63 # We want to generate an url to use as our cache key, we don't want to |
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64 # just re-use the URL because it might have other items in the fragment |
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65 # and we don't care about those. |
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66 key_parts = {"url": link.url_without_fragment} |
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67 if link.hash_name is not None and link.hash is not None: |
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68 key_parts[link.hash_name] = link.hash |
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69 if link.subdirectory_fragment: |
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70 key_parts["subdirectory"] = link.subdirectory_fragment |
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71 |
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72 # Include interpreter name, major and minor version in cache key |
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73 # to cope with ill-behaved sdists that build a different wheel |
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74 # depending on the python version their setup.py is being run on, |
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75 # and don't encode the difference in compatibility tags. |
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76 # https://github.com/pypa/pip/issues/7296 |
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77 key_parts["interpreter_name"] = interpreter_name() |
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78 key_parts["interpreter_version"] = interpreter_version() |
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79 |
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80 # Encode our key url with sha224, we'll use this because it has similar |
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81 # security properties to sha256, but with a shorter total output (and |
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82 # thus less secure). However the differences don't make a lot of |
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83 # difference for our use case here. |
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84 hashed = _hash_dict(key_parts) |
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85 |
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86 # We want to nest the directories some to prevent having a ton of top |
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87 # level directories where we might run out of sub directories on some |
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88 # FS. |
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89 parts = [hashed[:2], hashed[2:4], hashed[4:6], hashed[6:]] |
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90 |
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91 return parts |
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92 |
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93 def _get_candidates(self, link, canonical_package_name): |
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94 # type: (Link, str) -> List[Any] |
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95 can_not_cache = ( |
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96 not self.cache_dir or |
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97 not canonical_package_name or |
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98 not link |
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99 ) |
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100 if can_not_cache: |
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101 return [] |
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102 |
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103 formats = self.format_control.get_allowed_formats( |
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104 canonical_package_name |
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105 ) |
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106 if not self.allowed_formats.intersection(formats): |
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107 return [] |
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108 |
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109 candidates = [] |
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110 path = self.get_path_for_link(link) |
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111 if os.path.isdir(path): |
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112 for candidate in os.listdir(path): |
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113 candidates.append((candidate, path)) |
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114 return candidates |
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115 |
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116 def get_path_for_link(self, link): |
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117 # type: (Link) -> str |
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118 """Return a directory to store cached items in for link. |
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119 """ |
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120 raise NotImplementedError() |
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121 |
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122 def get( |
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123 self, |
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124 link, # type: Link |
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125 package_name, # type: Optional[str] |
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126 supported_tags, # type: List[Tag] |
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127 ): |
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128 # type: (...) -> Link |
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129 """Returns a link to a cached item if it exists, otherwise returns the |
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130 passed link. |
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131 """ |
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132 raise NotImplementedError() |
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133 |
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134 |
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135 class SimpleWheelCache(Cache): |
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136 """A cache of wheels for future installs. |
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137 """ |
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138 |
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139 def __init__(self, cache_dir, format_control): |
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140 # type: (str, FormatControl) -> None |
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141 super().__init__(cache_dir, format_control, {"binary"}) |
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142 |
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143 def get_path_for_link(self, link): |
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144 # type: (Link) -> str |
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145 """Return a directory to store cached wheels for link |
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146 |
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147 Because there are M wheels for any one sdist, we provide a directory |
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148 to cache them in, and then consult that directory when looking up |
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149 cache hits. |
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150 |
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151 We only insert things into the cache if they have plausible version |
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152 numbers, so that we don't contaminate the cache with things that were |
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153 not unique. E.g. ./package might have dozens of installs done for it |
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154 and build a version of 0.0...and if we built and cached a wheel, we'd |
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155 end up using the same wheel even if the source has been edited. |
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156 |
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157 :param link: The link of the sdist for which this will cache wheels. |
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158 """ |
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159 parts = self._get_cache_path_parts(link) |
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160 assert self.cache_dir |
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161 # Store wheels within the root cache_dir |
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162 return os.path.join(self.cache_dir, "wheels", *parts) |
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163 |
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164 def get( |
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165 self, |
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166 link, # type: Link |
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167 package_name, # type: Optional[str] |
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168 supported_tags, # type: List[Tag] |
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169 ): |
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170 # type: (...) -> Link |
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171 candidates = [] |
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172 |
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173 if not package_name: |
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174 return link |
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175 |
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176 canonical_package_name = canonicalize_name(package_name) |
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177 for wheel_name, wheel_dir in self._get_candidates( |
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178 link, canonical_package_name |
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179 ): |
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180 try: |
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181 wheel = Wheel(wheel_name) |
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182 except InvalidWheelFilename: |
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183 continue |
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184 if canonicalize_name(wheel.name) != canonical_package_name: |
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185 logger.debug( |
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186 "Ignoring cached wheel %s for %s as it " |
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187 "does not match the expected distribution name %s.", |
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188 wheel_name, link, package_name, |
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189 ) |
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190 continue |
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191 if not wheel.supported(supported_tags): |
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192 # Built for a different python/arch/etc |
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193 continue |
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194 candidates.append( |
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195 ( |
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196 wheel.support_index_min(supported_tags), |
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197 wheel_name, |
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198 wheel_dir, |
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199 ) |
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200 ) |
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201 |
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202 if not candidates: |
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203 return link |
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204 |
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205 _, wheel_name, wheel_dir = min(candidates) |
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206 return Link(path_to_url(os.path.join(wheel_dir, wheel_name))) |
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207 |
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208 |
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209 class EphemWheelCache(SimpleWheelCache): |
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210 """A SimpleWheelCache that creates it's own temporary cache directory |
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211 """ |
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212 |
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213 def __init__(self, format_control): |
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214 # type: (FormatControl) -> None |
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215 self._temp_dir = TempDirectory( |
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216 kind=tempdir_kinds.EPHEM_WHEEL_CACHE, |
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217 globally_managed=True, |
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218 ) |
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219 |
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220 super().__init__(self._temp_dir.path, format_control) |
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221 |
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222 |
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223 class CacheEntry: |
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224 def __init__( |
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225 self, |
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226 link, # type: Link |
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227 persistent, # type: bool |
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228 ): |
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229 self.link = link |
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230 self.persistent = persistent |
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231 |
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232 |
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233 class WheelCache(Cache): |
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234 """Wraps EphemWheelCache and SimpleWheelCache into a single Cache |
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235 |
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236 This Cache allows for gracefully degradation, using the ephem wheel cache |
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237 when a certain link is not found in the simple wheel cache first. |
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238 """ |
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239 |
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240 def __init__(self, cache_dir, format_control): |
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241 # type: (str, FormatControl) -> None |
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242 super().__init__(cache_dir, format_control, {'binary'}) |
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243 self._wheel_cache = SimpleWheelCache(cache_dir, format_control) |
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244 self._ephem_cache = EphemWheelCache(format_control) |
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245 |
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246 def get_path_for_link(self, link): |
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247 # type: (Link) -> str |
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248 return self._wheel_cache.get_path_for_link(link) |
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249 |
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250 def get_ephem_path_for_link(self, link): |
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251 # type: (Link) -> str |
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252 return self._ephem_cache.get_path_for_link(link) |
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253 |
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254 def get( |
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255 self, |
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256 link, # type: Link |
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257 package_name, # type: Optional[str] |
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258 supported_tags, # type: List[Tag] |
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259 ): |
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260 # type: (...) -> Link |
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261 cache_entry = self.get_cache_entry(link, package_name, supported_tags) |
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262 if cache_entry is None: |
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263 return link |
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264 return cache_entry.link |
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265 |
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266 def get_cache_entry( |
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267 self, |
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268 link, # type: Link |
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269 package_name, # type: Optional[str] |
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270 supported_tags, # type: List[Tag] |
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271 ): |
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272 # type: (...) -> Optional[CacheEntry] |
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273 """Returns a CacheEntry with a link to a cached item if it exists or |
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274 None. The cache entry indicates if the item was found in the persistent |
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275 or ephemeral cache. |
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276 """ |
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277 retval = self._wheel_cache.get( |
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278 link=link, |
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279 package_name=package_name, |
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280 supported_tags=supported_tags, |
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281 ) |
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282 if retval is not link: |
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283 return CacheEntry(retval, persistent=True) |
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284 |
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285 retval = self._ephem_cache.get( |
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286 link=link, |
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287 package_name=package_name, |
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288 supported_tags=supported_tags, |
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289 ) |
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290 if retval is not link: |
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291 return CacheEntry(retval, persistent=False) |
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292 |
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293 return None |