Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/cachecontrol/caches/file_cache.py @ 4:79f47841a781 draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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1 import hashlib
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2 import os
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3
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4 from lockfile import LockFile
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5 from lockfile.mkdirlockfile import MkdirLockFile
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6
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7 from ..cache import BaseCache
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8 from ..controller import CacheController
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9
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10
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11 def _secure_open_write(filename, fmode):
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12 # We only want to write to this file, so open it in write only mode
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13 flags = os.O_WRONLY
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14
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15 # os.O_CREAT | os.O_EXCL will fail if the file already exists, so we only
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16 # will open *new* files.
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17 # We specify this because we want to ensure that the mode we pass is the
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18 # mode of the file.
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19 flags |= os.O_CREAT | os.O_EXCL
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20
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21 # Do not follow symlinks to prevent someone from making a symlink that
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22 # we follow and insecurely open a cache file.
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23 if hasattr(os, "O_NOFOLLOW"):
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24 flags |= os.O_NOFOLLOW
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25
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26 # On Windows we'll mark this file as binary
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27 if hasattr(os, "O_BINARY"):
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28 flags |= os.O_BINARY
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29
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30 # Before we open our file, we want to delete any existing file that is
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31 # there
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32 try:
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33 os.remove(filename)
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34 except (IOError, OSError):
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35 # The file must not exist already, so we can just skip ahead to opening
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36 pass
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37
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38 # Open our file, the use of os.O_CREAT | os.O_EXCL will ensure that if a
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39 # race condition happens between the os.remove and this line, that an
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40 # error will be raised. Because we utilize a lockfile this should only
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41 # happen if someone is attempting to attack us.
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42 fd = os.open(filename, flags, fmode)
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43 try:
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44 return os.fdopen(fd, "wb")
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45 except:
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46 # An error occurred wrapping our FD in a file object
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47 os.close(fd)
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48 raise
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49
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50
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51 class FileCache(BaseCache):
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52 def __init__(self, directory, forever=False, filemode=0o0600,
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53 dirmode=0o0700, use_dir_lock=None, lock_class=None):
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54
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55 if use_dir_lock is not None and lock_class is not None:
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56 raise ValueError("Cannot use use_dir_lock and lock_class together")
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57
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58 if use_dir_lock:
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59 lock_class = MkdirLockFile
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60
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61 if lock_class is None:
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62 lock_class = LockFile
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63
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64 self.directory = directory
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65 self.forever = forever
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66 self.filemode = filemode
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67 self.dirmode = dirmode
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68 self.lock_class = lock_class
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69
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70
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71 @staticmethod
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72 def encode(x):
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73 return hashlib.sha224(x.encode()).hexdigest()
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74
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75 def _fn(self, name):
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76 # NOTE: This method should not change as some may depend on it.
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77 # See: https://github.com/ionrock/cachecontrol/issues/63
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78 hashed = self.encode(name)
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79 parts = list(hashed[:5]) + [hashed]
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80 return os.path.join(self.directory, *parts)
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81
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82 def get(self, key):
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83 name = self._fn(key)
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84 if not os.path.exists(name):
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85 return None
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86
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87 with open(name, 'rb') as fh:
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88 return fh.read()
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89
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90 def set(self, key, value):
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91 name = self._fn(key)
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92
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93 # Make sure the directory exists
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94 try:
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95 os.makedirs(os.path.dirname(name), self.dirmode)
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96 except (IOError, OSError):
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97 pass
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98
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99 with self.lock_class(name) as lock:
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100 # Write our actual file
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101 with _secure_open_write(lock.path, self.filemode) as fh:
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102 fh.write(value)
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103
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104 def delete(self, key):
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105 name = self._fn(key)
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106 if not self.forever:
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107 os.remove(name)
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108
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109
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110 def url_to_file_path(url, filecache):
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111 """Return the file cache path based on the URL.
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112
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113 This does not ensure the file exists!
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114 """
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115 key = CacheController.cache_url(url)
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116 return filecache._fn(key)