Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/boto/glacier/writer.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 # Copyright (c) 2012 Robie Basak <robie@justgohome.co.uk>
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4 # Tree hash implementation from Aaron Brady bradya@gmail.com
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5 #
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6 # Permission is hereby granted, free of charge, to any person obtaining a
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7 # copy of this software and associated documentation files (the
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8 # "Software"), to deal in the Software without restriction, including
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9 # without limitation the rights to use, copy, modify, merge, publish, dis-
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10 # tribute, sublicense, and/or sell copies of the Software, and to permit
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11 # persons to whom the Software is furnished to do so, subject to the fol-
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12 # lowing conditions:
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13 #
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14 # The above copyright notice and this permission notice shall be included
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15 # in all copies or substantial portions of the Software.
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16 #
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17 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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18 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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19 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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20 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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21 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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23 # IN THE SOFTWARE.
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24 #
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25 import hashlib
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26
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27 from boto.glacier.utils import chunk_hashes, tree_hash, bytes_to_hex
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28 # This import is provided for backwards compatibility. This function is
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29 # now in boto.glacier.utils, but any existing code can still import
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30 # this directly from this module.
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31 from boto.glacier.utils import compute_hashes_from_fileobj
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32
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33
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34 _ONE_MEGABYTE = 1024 * 1024
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35
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36
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37 class _Partitioner(object):
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38 """Convert variable-size writes into part-sized writes
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39
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40 Call write(data) with variable sized data as needed to write all data. Call
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41 flush() after all data is written.
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42
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43 This instance will call send_fn(part_data) as needed in part_size pieces,
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44 except for the final part which may be shorter than part_size. Make sure to
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45 call flush() to ensure that a short final part results in a final send_fn
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46 call.
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47
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48 """
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49 def __init__(self, part_size, send_fn):
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50 self.part_size = part_size
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51 self.send_fn = send_fn
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52 self._buffer = []
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53 self._buffer_size = 0
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54
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55 def write(self, data):
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56 if data == b'':
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57 return
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58 self._buffer.append(data)
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59 self._buffer_size += len(data)
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60 while self._buffer_size > self.part_size:
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61 self._send_part()
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62
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63 def _send_part(self):
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64 data = b''.join(self._buffer)
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65 # Put back any data remaining over the part size into the
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66 # buffer
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67 if len(data) > self.part_size:
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68 self._buffer = [data[self.part_size:]]
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69 self._buffer_size = len(self._buffer[0])
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70 else:
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71 self._buffer = []
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72 self._buffer_size = 0
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73 # The part we will send
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74 part = data[:self.part_size]
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75 self.send_fn(part)
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76
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77 def flush(self):
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78 if self._buffer_size > 0:
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79 self._send_part()
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80
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81
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82 class _Uploader(object):
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83 """Upload to a Glacier upload_id.
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84
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85 Call upload_part for each part (in any order) and then close to complete
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86 the upload.
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87
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88 """
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89 def __init__(self, vault, upload_id, part_size, chunk_size=_ONE_MEGABYTE):
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90 self.vault = vault
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91 self.upload_id = upload_id
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92 self.part_size = part_size
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93 self.chunk_size = chunk_size
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94 self.archive_id = None
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95
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96 self._uploaded_size = 0
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97 self._tree_hashes = []
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98
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99 self.closed = False
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100
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101 def _insert_tree_hash(self, index, raw_tree_hash):
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102 list_length = len(self._tree_hashes)
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103 if index >= list_length:
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104 self._tree_hashes.extend([None] * (list_length - index + 1))
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105 self._tree_hashes[index] = raw_tree_hash
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106
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107 def upload_part(self, part_index, part_data):
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108 """Upload a part to Glacier.
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109
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110 :param part_index: part number where 0 is the first part
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111 :param part_data: data to upload corresponding to this part
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112
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113 """
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114 if self.closed:
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115 raise ValueError("I/O operation on closed file")
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116 # Create a request and sign it
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117 part_tree_hash = tree_hash(chunk_hashes(part_data, self.chunk_size))
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118 self._insert_tree_hash(part_index, part_tree_hash)
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119
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120 hex_tree_hash = bytes_to_hex(part_tree_hash)
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121 linear_hash = hashlib.sha256(part_data).hexdigest()
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122 start = self.part_size * part_index
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123 content_range = (start,
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124 (start + len(part_data)) - 1)
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125 response = self.vault.layer1.upload_part(self.vault.name,
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126 self.upload_id,
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127 linear_hash,
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128 hex_tree_hash,
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129 content_range, part_data)
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130 response.read()
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131 self._uploaded_size += len(part_data)
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132
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133 def skip_part(self, part_index, part_tree_hash, part_length):
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134 """Skip uploading of a part.
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135
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136 The final close call needs to calculate the tree hash and total size
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137 of all uploaded data, so this is the mechanism for resume
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138 functionality to provide it without actually uploading the data again.
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139
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140 :param part_index: part number where 0 is the first part
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141 :param part_tree_hash: binary tree_hash of part being skipped
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142 :param part_length: length of part being skipped
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143
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144 """
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145 if self.closed:
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146 raise ValueError("I/O operation on closed file")
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147 self._insert_tree_hash(part_index, part_tree_hash)
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148 self._uploaded_size += part_length
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149
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150 def close(self):
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151 if self.closed:
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152 return
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153 if None in self._tree_hashes:
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154 raise RuntimeError("Some parts were not uploaded.")
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155 # Complete the multiplart glacier upload
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156 hex_tree_hash = bytes_to_hex(tree_hash(self._tree_hashes))
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157 response = self.vault.layer1.complete_multipart_upload(
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158 self.vault.name, self.upload_id, hex_tree_hash,
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159 self._uploaded_size)
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160 self.archive_id = response['ArchiveId']
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161 self.closed = True
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162
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163
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164 def generate_parts_from_fobj(fobj, part_size):
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165 data = fobj.read(part_size)
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166 while data:
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167 yield data.encode('utf-8')
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168 data = fobj.read(part_size)
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169
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170
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171 def resume_file_upload(vault, upload_id, part_size, fobj, part_hash_map,
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172 chunk_size=_ONE_MEGABYTE):
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173 """Resume upload of a file already part-uploaded to Glacier.
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174
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175 The resumption of an upload where the part-uploaded section is empty is a
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176 valid degenerate case that this function can handle. In this case,
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177 part_hash_map should be an empty dict.
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178
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179 :param vault: boto.glacier.vault.Vault object.
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180 :param upload_id: existing Glacier upload id of upload being resumed.
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181 :param part_size: part size of existing upload.
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182 :param fobj: file object containing local data to resume. This must read
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183 from the start of the entire upload, not just from the point being
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184 resumed. Use fobj.seek(0) to achieve this if necessary.
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185 :param part_hash_map: {part_index: part_tree_hash, ...} of data already
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186 uploaded. Each supplied part_tree_hash will be verified and the part
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187 re-uploaded if there is a mismatch.
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188 :param chunk_size: chunk size of tree hash calculation. This must be
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189 1 MiB for Amazon.
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190
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191 """
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192 uploader = _Uploader(vault, upload_id, part_size, chunk_size)
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193 for part_index, part_data in enumerate(
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194 generate_parts_from_fobj(fobj, part_size)):
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195 part_tree_hash = tree_hash(chunk_hashes(part_data, chunk_size))
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196 if (part_index not in part_hash_map or
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197 part_hash_map[part_index] != part_tree_hash):
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198 uploader.upload_part(part_index, part_data)
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199 else:
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200 uploader.skip_part(part_index, part_tree_hash, len(part_data))
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201 uploader.close()
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202 return uploader.archive_id
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203
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204
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205 class Writer(object):
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206 """
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207 Presents a file-like object for writing to a Amazon Glacier
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208 Archive. The data is written using the multi-part upload API.
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209 """
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210 def __init__(self, vault, upload_id, part_size, chunk_size=_ONE_MEGABYTE):
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211 self.uploader = _Uploader(vault, upload_id, part_size, chunk_size)
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212 self.partitioner = _Partitioner(part_size, self._upload_part)
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213 self.closed = False
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214 self.next_part_index = 0
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215
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216 def write(self, data):
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217 if self.closed:
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218 raise ValueError("I/O operation on closed file")
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219 self.partitioner.write(data)
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220
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221 def _upload_part(self, part_data):
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222 self.uploader.upload_part(self.next_part_index, part_data)
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223 self.next_part_index += 1
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224
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225 def close(self):
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226 if self.closed:
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227 return
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228 self.partitioner.flush()
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229 self.uploader.close()
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230 self.closed = True
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231
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232 def get_archive_id(self):
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233 self.close()
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234 return self.uploader.archive_id
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235
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236 @property
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237 def current_tree_hash(self):
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238 """
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239 Returns the current tree hash for the data that's been written
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240 **so far**.
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241
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242 Only once the writing is complete is the final tree hash returned.
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243 """
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244 return tree_hash(self.uploader._tree_hashes)
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245
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246 @property
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247 def current_uploaded_size(self):
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248 """
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249 Returns the current uploaded size for the data that's been written
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250 **so far**.
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251
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252 Only once the writing is complete is the final uploaded size returned.
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253 """
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254 return self.uploader._uploaded_size
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255
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256 @property
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257 def upload_id(self):
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258 return self.uploader.upload_id
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259
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260 @property
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261 def vault(self):
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262 return self.uploader.vault