Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/boto/glacier/job.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 # -*- coding: utf-8 -*-
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2 # Copyright (c) 2012 Thomas Parslow http://almostobsolete.net/
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3 #
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4 # Permission is hereby granted, free of charge, to any person obtaining a
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5 # copy of this software and associated documentation files (the
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6 # "Software"), to deal in the Software without restriction, including
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7 # without limitation the rights to use, copy, modify, merge, publish, dis-
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8 # tribute, sublicense, and/or sell copies of the Software, and to permit
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9 # persons to whom the Software is furnished to do so, subject to the fol-
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10 # lowing conditions:
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11 #
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12 # The above copyright notice and this permission notice shall be included
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13 # in all copies or substantial portions of the Software.
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14 #
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15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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16 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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17 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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18 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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19 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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20 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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21 # IN THE SOFTWARE.
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22 #
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23 import math
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24 import socket
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25
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26 from boto.glacier.exceptions import TreeHashDoesNotMatchError, \
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27 DownloadArchiveError
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28 from boto.glacier.utils import tree_hash_from_str
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29
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30
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31 class Job(object):
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32
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33 DefaultPartSize = 4 * 1024 * 1024
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34
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35 ResponseDataElements = (('Action', 'action', None),
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36 ('ArchiveId', 'archive_id', None),
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37 ('ArchiveSizeInBytes', 'archive_size', 0),
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38 ('Completed', 'completed', False),
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39 ('CompletionDate', 'completion_date', None),
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40 ('CreationDate', 'creation_date', None),
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41 ('InventorySizeInBytes', 'inventory_size', 0),
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42 ('JobDescription', 'description', None),
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43 ('JobId', 'id', None),
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44 ('SHA256TreeHash', 'sha256_treehash', None),
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45 ('SNSTopic', 'sns_topic', None),
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46 ('StatusCode', 'status_code', None),
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47 ('StatusMessage', 'status_message', None),
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48 ('VaultARN', 'arn', None))
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49
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50 def __init__(self, vault, response_data=None):
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51 self.vault = vault
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52 if response_data:
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53 for response_name, attr_name, default in self.ResponseDataElements:
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54 setattr(self, attr_name, response_data[response_name])
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55 else:
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56 for response_name, attr_name, default in self.ResponseDataElements:
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57 setattr(self, attr_name, default)
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58
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59 def __repr__(self):
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60 return 'Job(%s)' % self.arn
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61
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62 def get_output(self, byte_range=None, validate_checksum=False):
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63 """
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64 This operation downloads the output of the job. Depending on
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65 the job type you specified when you initiated the job, the
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66 output will be either the content of an archive or a vault
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67 inventory.
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68
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69 You can download all the job output or download a portion of
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70 the output by specifying a byte range. In the case of an
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71 archive retrieval job, depending on the byte range you
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72 specify, Amazon Glacier returns the checksum for the portion
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73 of the data. You can compute the checksum on the client and
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74 verify that the values match to ensure the portion you
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75 downloaded is the correct data.
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76
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77 :type byte_range: tuple
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78 :param range: A tuple of integer specifying the slice (in bytes)
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79 of the archive you want to receive
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80
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81 :type validate_checksum: bool
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82 :param validate_checksum: Specify whether or not to validate
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83 the associate tree hash. If the response does not contain
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84 a TreeHash, then no checksum will be verified.
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85
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86 """
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87 response = self.vault.layer1.get_job_output(self.vault.name,
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88 self.id,
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89 byte_range)
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90 if validate_checksum and 'TreeHash' in response:
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91 data = response.read()
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92 actual_tree_hash = tree_hash_from_str(data)
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93 if response['TreeHash'] != actual_tree_hash:
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94 raise TreeHashDoesNotMatchError(
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95 "The calculated tree hash %s does not match the "
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96 "expected tree hash %s for the byte range %s" % (
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97 actual_tree_hash, response['TreeHash'], byte_range))
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98 return response
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99
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100 def _calc_num_chunks(self, chunk_size):
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101 return int(math.ceil(self.archive_size / float(chunk_size)))
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102
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103 def download_to_file(self, filename, chunk_size=DefaultPartSize,
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104 verify_hashes=True, retry_exceptions=(socket.error,)):
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105 """Download an archive to a file by name.
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106
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107 :type filename: str
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108 :param filename: The name of the file where the archive
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109 contents will be saved.
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110
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111 :type chunk_size: int
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112 :param chunk_size: The chunk size to use when downloading
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113 the archive.
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114
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115 :type verify_hashes: bool
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116 :param verify_hashes: Indicates whether or not to verify
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117 the tree hashes for each downloaded chunk.
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118
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119 """
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120 num_chunks = self._calc_num_chunks(chunk_size)
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121 with open(filename, 'wb') as output_file:
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122 self._download_to_fileob(output_file, num_chunks, chunk_size,
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123 verify_hashes, retry_exceptions)
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124
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125 def download_to_fileobj(self, output_file, chunk_size=DefaultPartSize,
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126 verify_hashes=True,
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127 retry_exceptions=(socket.error,)):
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128 """Download an archive to a file object.
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129
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130 :type output_file: file
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131 :param output_file: The file object where the archive
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132 contents will be saved.
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133
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134 :type chunk_size: int
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135 :param chunk_size: The chunk size to use when downloading
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136 the archive.
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137
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138 :type verify_hashes: bool
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139 :param verify_hashes: Indicates whether or not to verify
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140 the tree hashes for each downloaded chunk.
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141
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142 """
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143 num_chunks = self._calc_num_chunks(chunk_size)
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144 self._download_to_fileob(output_file, num_chunks, chunk_size,
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145 verify_hashes, retry_exceptions)
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146
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147 def _download_to_fileob(self, fileobj, num_chunks, chunk_size, verify_hashes,
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148 retry_exceptions):
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149 for i in range(num_chunks):
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150 byte_range = ((i * chunk_size), ((i + 1) * chunk_size) - 1)
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151 data, expected_tree_hash = self._download_byte_range(
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152 byte_range, retry_exceptions)
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153 if verify_hashes:
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154 actual_tree_hash = tree_hash_from_str(data)
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155 if expected_tree_hash != actual_tree_hash:
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156 raise TreeHashDoesNotMatchError(
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157 "The calculated tree hash %s does not match the "
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158 "expected tree hash %s for the byte range %s" % (
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159 actual_tree_hash, expected_tree_hash, byte_range))
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160 fileobj.write(data)
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161
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162 def _download_byte_range(self, byte_range, retry_exceptions):
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163 # You can occasionally get socket.errors when downloading
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164 # chunks from Glacier, so each chunk can be retried up
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165 # to 5 times.
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166 for _ in range(5):
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167 try:
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168 response = self.get_output(byte_range)
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169 data = response.read()
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170 expected_tree_hash = response['TreeHash']
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171 return data, expected_tree_hash
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172 except retry_exceptions as e:
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173 continue
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174 else:
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175 raise DownloadArchiveError("There was an error downloading"
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176 "byte range %s: %s" % (byte_range,
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177 e))