Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/boto/glacier/utils.py @ 2:6af9afd405e9 draft

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"planemo upload commit 0a63dd5f4d38a1f6944587f52a8cd79874177fc1"
author shellac
date Thu, 14 May 2020 14:56:58 -0400
parents 26e78fe6e8c4
children
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1 # Copyright (c) 2012 Amazon.com, Inc. or its affiliates. All Rights Reserved
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2 #
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3 # Permission is hereby granted, free of charge, to any person obtaining a
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4 # copy of this software and associated documentation files (the
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5 # "Software"), to deal in the Software without restriction, including
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6 # without limitation the rights to use, copy, modify, merge, publish, dis-
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7 # tribute, sublicense, and/or sell copies of the Software, and to permit
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8 # persons to whom the Software is furnished to do so, subject to the fol-
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9 # lowing conditions:
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10 #
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11 # The above copyright notice and this permission notice shall be included
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12 # in all copies or substantial portions of the Software.
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13 #
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14 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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15 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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16 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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17 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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18 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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20 # IN THE SOFTWARE.
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21 #
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22 import hashlib
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23 import math
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24 import binascii
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25
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26 from boto.compat import six
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27
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28
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29 _MEGABYTE = 1024 * 1024
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30 DEFAULT_PART_SIZE = 4 * _MEGABYTE
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31 MAXIMUM_NUMBER_OF_PARTS = 10000
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32
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33
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34 def minimum_part_size(size_in_bytes, default_part_size=DEFAULT_PART_SIZE):
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35 """Calculate the minimum part size needed for a multipart upload.
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36
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37 Glacier allows a maximum of 10,000 parts per upload. It also
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38 states that the maximum archive size is 10,000 * 4 GB, which means
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39 the part size can range from 1MB to 4GB (provided it is one 1MB
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40 multiplied by a power of 2).
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41
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42 This function will compute what the minimum part size must be in
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43 order to upload a file of size ``size_in_bytes``.
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44
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45 It will first check if ``default_part_size`` is sufficient for
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46 a part size given the ``size_in_bytes``. If this is not the case,
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47 then the smallest part size than can accomodate a file of size
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48 ``size_in_bytes`` will be returned.
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49
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50 If the file size is greater than the maximum allowed archive
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51 size of 10,000 * 4GB, a ``ValueError`` will be raised.
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52
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53 """
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54 # The default part size (4 MB) will be too small for a very large
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55 # archive, as there is a limit of 10,000 parts in a multipart upload.
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56 # This puts the maximum allowed archive size with the default part size
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57 # at 40,000 MB. We need to do a sanity check on the part size, and find
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58 # one that works if the default is too small.
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59 part_size = _MEGABYTE
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60 if (default_part_size * MAXIMUM_NUMBER_OF_PARTS) < size_in_bytes:
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61 if size_in_bytes > (4096 * _MEGABYTE * 10000):
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62 raise ValueError("File size too large: %s" % size_in_bytes)
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63 min_part_size = size_in_bytes / 10000
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64 power = 3
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65 while part_size < min_part_size:
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66 part_size = math.ldexp(_MEGABYTE, power)
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67 power += 1
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68 part_size = int(part_size)
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69 else:
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70 part_size = default_part_size
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71 return part_size
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72
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73
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74 def chunk_hashes(bytestring, chunk_size=_MEGABYTE):
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75 chunk_count = int(math.ceil(len(bytestring) / float(chunk_size)))
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76 hashes = []
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77 for i in range(chunk_count):
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78 start = i * chunk_size
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79 end = (i + 1) * chunk_size
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80 hashes.append(hashlib.sha256(bytestring[start:end]).digest())
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81 if not hashes:
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82 return [hashlib.sha256(b'').digest()]
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83 return hashes
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84
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85
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86 def tree_hash(fo):
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87 """
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88 Given a hash of each 1MB chunk (from chunk_hashes) this will hash
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89 together adjacent hashes until it ends up with one big one. So a
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90 tree of hashes.
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91 """
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92 hashes = []
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93 hashes.extend(fo)
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94 while len(hashes) > 1:
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95 new_hashes = []
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96 while True:
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97 if len(hashes) > 1:
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98 first = hashes.pop(0)
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99 second = hashes.pop(0)
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100 new_hashes.append(hashlib.sha256(first + second).digest())
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101 elif len(hashes) == 1:
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102 only = hashes.pop(0)
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103 new_hashes.append(only)
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104 else:
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105 break
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106 hashes.extend(new_hashes)
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107 return hashes[0]
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108
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109
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110 def compute_hashes_from_fileobj(fileobj, chunk_size=1024 * 1024):
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111 """Compute the linear and tree hash from a fileobj.
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112
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113 This function will compute the linear/tree hash of a fileobj
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114 in a single pass through the fileobj.
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115
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116 :param fileobj: A file like object.
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117
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118 :param chunk_size: The size of the chunks to use for the tree
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119 hash. This is also the buffer size used to read from
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120 `fileobj`.
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121
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122 :rtype: tuple
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123 :return: A tuple of (linear_hash, tree_hash). Both hashes
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124 are returned in hex.
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125
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126 """
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127 # Python 3+, not binary
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128 if six.PY3 and hasattr(fileobj, 'mode') and 'b' not in fileobj.mode:
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129 raise ValueError('File-like object must be opened in binary mode!')
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130
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131 linear_hash = hashlib.sha256()
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132 chunks = []
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133 chunk = fileobj.read(chunk_size)
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134 while chunk:
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135 # It's possible to get a file-like object that has no mode (checked
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136 # above) and returns something other than bytes (e.g. str). So here
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137 # we try to catch that and encode to bytes.
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138 if not isinstance(chunk, bytes):
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139 chunk = chunk.encode(getattr(fileobj, 'encoding', '') or 'utf-8')
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140 linear_hash.update(chunk)
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141 chunks.append(hashlib.sha256(chunk).digest())
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142 chunk = fileobj.read(chunk_size)
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143 if not chunks:
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144 chunks = [hashlib.sha256(b'').digest()]
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145 return linear_hash.hexdigest(), bytes_to_hex(tree_hash(chunks))
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146
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147
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148 def bytes_to_hex(str_as_bytes):
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149 return binascii.hexlify(str_as_bytes)
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150
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151
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152 def tree_hash_from_str(str_as_bytes):
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153 """
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154
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155 :type str_as_bytes: str
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156 :param str_as_bytes: The string for which to compute the tree hash.
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157
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158 :rtype: str
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159 :return: The computed tree hash, returned as hex.
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160
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161 """
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162 return bytes_to_hex(tree_hash(chunk_hashes(str_as_bytes)))
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163
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164
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165 class ResettingFileSender(object):
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166 def __init__(self, archive):
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167 self._archive = archive
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168 self._starting_offset = archive.tell()
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169
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170 def __call__(self, connection, method, path, body, headers):
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171 try:
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172 connection.request(method, path, self._archive, headers)
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173 return connection.getresponse()
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174 finally:
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175 self._archive.seek(self._starting_offset)