Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/pip/_internal/network/lazy_wheel.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 """Lazy ZIP over HTTP""" |
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2 |
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3 __all__ = ['HTTPRangeRequestUnsupported', 'dist_from_wheel_url'] |
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4 |
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5 from bisect import bisect_left, bisect_right |
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6 from contextlib import contextmanager |
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7 from tempfile import NamedTemporaryFile |
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8 from zipfile import BadZipfile, ZipFile |
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9 |
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10 from pip._vendor.requests.models import CONTENT_CHUNK_SIZE |
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11 |
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12 from pip._internal.network.utils import HEADERS, raise_for_status, response_chunks |
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13 from pip._internal.utils.typing import MYPY_CHECK_RUNNING |
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14 from pip._internal.utils.wheel import pkg_resources_distribution_for_wheel |
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15 |
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16 if MYPY_CHECK_RUNNING: |
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17 from typing import Any, Dict, Iterator, List, Optional, Tuple |
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18 |
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19 from pip._vendor.pkg_resources import Distribution |
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20 from pip._vendor.requests.models import Response |
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21 |
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22 from pip._internal.network.session import PipSession |
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23 |
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24 |
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25 class HTTPRangeRequestUnsupported(Exception): |
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26 pass |
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27 |
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28 |
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29 def dist_from_wheel_url(name, url, session): |
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30 # type: (str, str, PipSession) -> Distribution |
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31 """Return a pkg_resources.Distribution from the given wheel URL. |
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32 |
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33 This uses HTTP range requests to only fetch the potion of the wheel |
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34 containing metadata, just enough for the object to be constructed. |
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35 If such requests are not supported, HTTPRangeRequestUnsupported |
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36 is raised. |
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37 """ |
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38 with LazyZipOverHTTP(url, session) as wheel: |
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39 # For read-only ZIP files, ZipFile only needs methods read, |
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40 # seek, seekable and tell, not the whole IO protocol. |
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41 zip_file = ZipFile(wheel) # type: ignore |
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42 # After context manager exit, wheel.name |
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43 # is an invalid file by intention. |
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44 return pkg_resources_distribution_for_wheel(zip_file, name, wheel.name) |
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45 |
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46 |
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47 class LazyZipOverHTTP: |
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48 """File-like object mapped to a ZIP file over HTTP. |
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49 |
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50 This uses HTTP range requests to lazily fetch the file's content, |
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51 which is supposed to be fed to ZipFile. If such requests are not |
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52 supported by the server, raise HTTPRangeRequestUnsupported |
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53 during initialization. |
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54 """ |
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55 |
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56 def __init__(self, url, session, chunk_size=CONTENT_CHUNK_SIZE): |
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57 # type: (str, PipSession, int) -> None |
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58 head = session.head(url, headers=HEADERS) |
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59 raise_for_status(head) |
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60 assert head.status_code == 200 |
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61 self._session, self._url, self._chunk_size = session, url, chunk_size |
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62 self._length = int(head.headers['Content-Length']) |
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63 self._file = NamedTemporaryFile() |
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64 self.truncate(self._length) |
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65 self._left = [] # type: List[int] |
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66 self._right = [] # type: List[int] |
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67 if 'bytes' not in head.headers.get('Accept-Ranges', 'none'): |
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68 raise HTTPRangeRequestUnsupported('range request is not supported') |
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69 self._check_zip() |
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70 |
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71 @property |
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72 def mode(self): |
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73 # type: () -> str |
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74 """Opening mode, which is always rb.""" |
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75 return 'rb' |
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76 |
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77 @property |
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78 def name(self): |
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79 # type: () -> str |
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80 """Path to the underlying file.""" |
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81 return self._file.name |
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82 |
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83 def seekable(self): |
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84 # type: () -> bool |
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85 """Return whether random access is supported, which is True.""" |
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86 return True |
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87 |
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88 def close(self): |
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89 # type: () -> None |
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90 """Close the file.""" |
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91 self._file.close() |
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92 |
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93 @property |
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94 def closed(self): |
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95 # type: () -> bool |
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96 """Whether the file is closed.""" |
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97 return self._file.closed |
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98 |
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99 def read(self, size=-1): |
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100 # type: (int) -> bytes |
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101 """Read up to size bytes from the object and return them. |
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102 |
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103 As a convenience, if size is unspecified or -1, |
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104 all bytes until EOF are returned. Fewer than |
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105 size bytes may be returned if EOF is reached. |
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106 """ |
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107 download_size = max(size, self._chunk_size) |
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108 start, length = self.tell(), self._length |
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109 stop = length if size < 0 else min(start+download_size, length) |
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110 start = max(0, stop-download_size) |
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111 self._download(start, stop-1) |
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112 return self._file.read(size) |
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113 |
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114 def readable(self): |
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115 # type: () -> bool |
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116 """Return whether the file is readable, which is True.""" |
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117 return True |
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118 |
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119 def seek(self, offset, whence=0): |
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120 # type: (int, int) -> int |
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121 """Change stream position and return the new absolute position. |
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122 |
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123 Seek to offset relative position indicated by whence: |
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124 * 0: Start of stream (the default). pos should be >= 0; |
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125 * 1: Current position - pos may be negative; |
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126 * 2: End of stream - pos usually negative. |
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127 """ |
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128 return self._file.seek(offset, whence) |
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129 |
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130 def tell(self): |
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131 # type: () -> int |
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132 """Return the current possition.""" |
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133 return self._file.tell() |
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134 |
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135 def truncate(self, size=None): |
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136 # type: (Optional[int]) -> int |
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137 """Resize the stream to the given size in bytes. |
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138 |
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139 If size is unspecified resize to the current position. |
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140 The current stream position isn't changed. |
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141 |
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142 Return the new file size. |
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143 """ |
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144 return self._file.truncate(size) |
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145 |
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146 def writable(self): |
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147 # type: () -> bool |
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148 """Return False.""" |
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149 return False |
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150 |
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151 def __enter__(self): |
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152 # type: () -> LazyZipOverHTTP |
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153 self._file.__enter__() |
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154 return self |
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155 |
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156 def __exit__(self, *exc): |
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157 # type: (*Any) -> Optional[bool] |
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158 return self._file.__exit__(*exc) |
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159 |
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160 @contextmanager |
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161 def _stay(self): |
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162 # type: ()-> Iterator[None] |
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163 """Return a context manager keeping the position. |
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164 |
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165 At the end of the block, seek back to original position. |
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166 """ |
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167 pos = self.tell() |
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168 try: |
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169 yield |
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170 finally: |
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171 self.seek(pos) |
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172 |
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173 def _check_zip(self): |
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174 # type: () -> None |
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175 """Check and download until the file is a valid ZIP.""" |
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176 end = self._length - 1 |
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177 for start in reversed(range(0, end, self._chunk_size)): |
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178 self._download(start, end) |
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179 with self._stay(): |
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180 try: |
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181 # For read-only ZIP files, ZipFile only needs |
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182 # methods read, seek, seekable and tell. |
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183 ZipFile(self) # type: ignore |
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184 except BadZipfile: |
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185 pass |
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186 else: |
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187 break |
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188 |
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189 def _stream_response(self, start, end, base_headers=HEADERS): |
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190 # type: (int, int, Dict[str, str]) -> Response |
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191 """Return HTTP response to a range request from start to end.""" |
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192 headers = base_headers.copy() |
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193 headers['Range'] = f'bytes={start}-{end}' |
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194 # TODO: Get range requests to be correctly cached |
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195 headers['Cache-Control'] = 'no-cache' |
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196 return self._session.get(self._url, headers=headers, stream=True) |
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197 |
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198 def _merge(self, start, end, left, right): |
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199 # type: (int, int, int, int) -> Iterator[Tuple[int, int]] |
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200 """Return an iterator of intervals to be fetched. |
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201 |
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202 Args: |
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203 start (int): Start of needed interval |
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204 end (int): End of needed interval |
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205 left (int): Index of first overlapping downloaded data |
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206 right (int): Index after last overlapping downloaded data |
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207 """ |
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208 lslice, rslice = self._left[left:right], self._right[left:right] |
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209 i = start = min([start]+lslice[:1]) |
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210 end = max([end]+rslice[-1:]) |
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211 for j, k in zip(lslice, rslice): |
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212 if j > i: |
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213 yield i, j-1 |
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214 i = k + 1 |
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215 if i <= end: |
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216 yield i, end |
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217 self._left[left:right], self._right[left:right] = [start], [end] |
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218 |
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219 def _download(self, start, end): |
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220 # type: (int, int) -> None |
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221 """Download bytes from start to end inclusively.""" |
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222 with self._stay(): |
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223 left = bisect_left(self._right, start) |
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224 right = bisect_right(self._left, end) |
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225 for start, end in self._merge(start, end, left, right): |
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226 response = self._stream_response(start, end) |
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227 response.raise_for_status() |
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228 self.seek(start) |
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229 for chunk in response_chunks(response, self._chunk_size): |
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230 self._file.write(chunk) |