Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/boto/s3/keyfile.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 # Copyright 2013 Google Inc.
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2 # Copyright 2011, Nexenta Systems Inc.
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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 """
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24 Wrapper class to expose a Key being read via a partial implementaiton of the
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25 Python file interface. The only functions supported are those needed for seeking
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26 in a Key open for reading.
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27 """
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28
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29 import os
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30 from boto.exception import StorageResponseError
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31
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32 class KeyFile():
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33
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34 def __init__(self, key):
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35 self.key = key
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36 self.key.open_read()
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37 self.location = 0
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38 self.closed = False
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39 self.softspace = -1 # Not implemented.
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40 self.mode = 'r'
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41 self.encoding = 'Undefined in KeyFile'
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42 self.errors = 'Undefined in KeyFile'
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43 self.newlines = 'Undefined in KeyFile'
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44 self.name = key.name
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45
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46 def tell(self):
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47 if self.location is None:
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48 raise ValueError("I/O operation on closed file")
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49 return self.location
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50
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51 def seek(self, pos, whence=os.SEEK_SET):
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52 self.key.close(fast=True)
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53 if whence == os.SEEK_END:
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54 # We need special handling for this case because sending an HTTP range GET
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55 # with EOF for the range start would cause an invalid range error. Instead
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56 # we position to one before EOF (plus pos) and then read one byte to
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57 # position at EOF.
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58 if self.key.size == 0:
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59 # Don't try to seek with an empty key.
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60 return
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61 pos = self.key.size + pos - 1
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62 if pos < 0:
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63 raise IOError("Invalid argument")
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64 self.key.open_read(headers={"Range": "bytes=%d-" % pos})
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65 self.key.read(1)
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66 self.location = pos + 1
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67 return
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68
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69 if whence == os.SEEK_SET:
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70 if pos < 0:
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71 raise IOError("Invalid argument")
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72 elif whence == os.SEEK_CUR:
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73 pos += self.location
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74 else:
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75 raise IOError('Invalid whence param (%d) passed to seek' % whence)
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76 try:
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77 self.key.open_read(headers={"Range": "bytes=%d-" % pos})
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78 except StorageResponseError as e:
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79 # 416 Invalid Range means that the given starting byte was past the end
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80 # of file. We catch this because the Python file interface allows silently
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81 # seeking past the end of the file.
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82 if e.status != 416:
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83 raise
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84
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85 self.location = pos
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86
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87 def read(self, size):
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88 self.location += size
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89 return self.key.read(size)
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90
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91 def close(self):
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92 self.key.close()
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93 self.location = None
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94 self.closed = True
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95
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96 def isatty(self):
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97 return False
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98
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99 # Non-file interface, useful for code that wants to dig into underlying Key
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100 # state.
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101 def getkey(self):
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102 return self.key
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103
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104 # Unimplemented interfaces below here.
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105
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106 def write(self, buf):
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107 raise NotImplementedError('write not implemented in KeyFile')
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108
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109 def fileno(self):
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110 raise NotImplementedError('fileno not implemented in KeyFile')
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111
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112 def flush(self):
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113 raise NotImplementedError('flush not implemented in KeyFile')
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114
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115 def next(self):
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116 raise NotImplementedError('next not implemented in KeyFile')
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117
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118 def readinto(self):
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119 raise NotImplementedError('readinto not implemented in KeyFile')
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120
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121 def readline(self):
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122 raise NotImplementedError('readline not implemented in KeyFile')
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123
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124 def readlines(self):
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125 raise NotImplementedError('readlines not implemented in KeyFile')
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126
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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127 def truncate(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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128 raise NotImplementedError('truncate not implemented in KeyFile')
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129
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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130 def writelines(self):
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131 raise NotImplementedError('writelines not implemented in KeyFile')
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132
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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133 def xreadlines(self):
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134 raise NotImplementedError('xreadlines not implemented in KeyFile')