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annotate sat/tools/stream.py @ 3891:989df1047c3c

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tests (AP gateway): reactions tests: 2 new tests check XMPP <=> AP reactions conversion rel 371
author Goffi <goffi@goffi.org>
date Wed, 31 Aug 2022 17:07:03 +0200
parents 7550ae9cfbac
children e4631d073c8b
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1 #!/usr/bin/env python3
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2
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3 # Libervia: an XMPP client
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4 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 """ interfaces """
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20
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21 import uuid
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22 import os
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23 from zope import interface
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24 from sat.core import exceptions
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25 from sat.core.constants import Const as C
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26 from sat.core.log import getLogger
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27 from twisted.protocols import basic
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28 from twisted.internet import interfaces
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29
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30 log = getLogger(__name__)
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31
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32
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33 class IStreamProducer(interface.Interface):
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34 def startStream(consumer):
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35 """start producing the stream
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36
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37 @return (D): deferred fired when stream is finished
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38 """
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39 pass
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40
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41
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42 class SatFile:
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43 """A file-like object to have high level files manipulation"""
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44
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45 # TODO: manage "with" statement
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46
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47 def __init__(self, host, client, path, mode="rb", uid=None, size=None, data_cb=None,
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48 auto_end_signals=True, check_size_with_read=False):
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49 """
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50 @param host: %(doc_host)s
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51 @param path(Path, str): path to the file to get or write to
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52 @param mode(str): same as for built-in "open" function
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53 @param uid(unicode, None): unique id identifing this progressing element
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54 This uid will be used with self.host.progressGet
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55 will be automaticaly generated if None
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56 @param size(None, int): size of the file (when known in advance)
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57 @param data_cb(None, callable): method to call on each data read/write
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58 can be used to do processing like calculating hash.
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59 if data_cb return a non None value, it will be used instead of the
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60 data read/to write
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61 @param auto_end_signals(bool): if True, progressFinished and progressError signals
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62 are automatically sent.
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63 if False, you'll have to call self.progressFinished and self.progressError
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64 yourself.
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65 progressStarted signal is always sent automatically
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66 @param check_size_with_read(bool): if True, size well be checked using number of
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67 bytes read or written. This is useful when data_cb modifiy len of file.
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68 """
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69 self.host = host
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70 self.profile = client.profile
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71 self.uid = uid or str(uuid.uuid4())
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72 self._file = open(path, mode)
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73 self.size = size
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74 self.data_cb = data_cb
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75 self.auto_end_signals = auto_end_signals
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76 metadata = self.getProgressMetadata()
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77 self.host.registerProgressCb(
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78 self.uid, self.getProgress, metadata, profile=client.profile
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79 )
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80 self.host.bridge.progressStarted(self.uid, metadata, client.profile)
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81
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82 self._transfer_count = 0 if check_size_with_read else None
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83
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84 @property
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85 def check_size_with_read(self):
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86 return self._transfer_count is not None
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87
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88 @check_size_with_read.setter
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89 def check_size_with_read(self, value):
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90 if value and self._transfer_count is None:
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91 self._transfer_count = 0
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92 else:
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93 self._transfer_count = None
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94
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95 def checkSize(self):
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96 """Check that current size correspond to given size
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97
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98 must be used when the transfer is supposed to be finished
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99 @return (bool): True if the position is the same as given size
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100 @raise exceptions.NotFound: size has not be specified
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101 """
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102 if self.check_size_with_read:
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103 position = self._transfer_count
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104 else:
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105 position = self._file.tell()
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106 if self.size is None:
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107 raise exceptions.NotFound
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108 return position == self.size
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109
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110 def close(self, progress_metadata=None, error=None):
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111 """Close the current file
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112
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113 @param progress_metadata(None, dict): metadata to send with _onProgressFinished
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114 message
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115 @param error(None, unicode): set to an error message if progress was not
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116 successful
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117 mutually exclusive with progress_metadata
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118 error can happen even if error is None, if current size differ from given size
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119 """
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120 if self._file.closed:
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121 return # avoid double close (which is allowed) error
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122 if error is None:
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123 try:
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124 size_ok = self.checkSize()
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125 except exceptions.NotFound:
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126 size_ok = True
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127 if not size_ok:
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128 error = "declared and actual size mismatch"
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129 log.warning(error)
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130 progress_metadata = None
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131
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132 self._file.close()
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133
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134 if self.auto_end_signals:
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135 if error is None:
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136 self.progressFinished(progress_metadata)
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137 else:
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138 assert progress_metadata is None
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139 self.progressError(error)
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140
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141 self.host.removeProgressCb(self.uid, self.profile)
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142
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143 @property
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144 def closed(self):
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145 return self._file.closed
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146
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147 def progressFinished(self, metadata=None):
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148 if metadata is None:
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149 metadata = {}
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150 self.host.bridge.progressFinished(self.uid, metadata, self.profile)
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151
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152 def progressError(self, error):
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153 self.host.bridge.progressError(self.uid, error, self.profile)
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154
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155 def flush(self):
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156 self._file.flush()
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157
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158 def write(self, buf):
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159 if self.data_cb is not None:
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160 ret = self.data_cb(buf)
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161 if ret is not None:
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162 buf = ret
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163 if self._transfer_count is not None:
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164 self._transfer_count += len(buf)
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165 self._file.write(buf)
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166
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167 def read(self, size=-1):
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168 read = self._file.read(size)
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169 if self.data_cb is not None:
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170 ret = self.data_cb(read)
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171 if ret is not None:
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172 read = ret
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173 if self._transfer_count is not None:
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174 self._transfer_count += len(read)
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175 return read
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176
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177 def seek(self, offset, whence=os.SEEK_SET):
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178 self._file.seek(offset, whence)
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179
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180 def tell(self):
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181 return self._file.tell()
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182
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183 def mode(self):
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184 return self._file.mode()
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185
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186 def getProgressMetadata(self):
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187 """Return progression metadata as given to progressStarted
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188
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189 @return (dict): metadata (check bridge for documentation)
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190 """
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191 metadata = {"type": C.META_TYPE_FILE}
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192
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193 mode = self._file.mode
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194 if "+" in mode:
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195 pass # we have no direction in read/write modes
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196 elif mode in ("r", "rb"):
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197 metadata["direction"] = "out"
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198 elif mode in ("w", "wb"):
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199 metadata["direction"] = "in"
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200 elif "U" in mode:
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201 metadata["direction"] = "out"
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202 else:
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203 raise exceptions.InternalError
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204
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205 metadata["name"] = self._file.name
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206
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207 return metadata
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208
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209 def getProgress(self, progress_id, profile):
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210 ret = {"position": self._file.tell()}
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211 if self.size:
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212 ret["size"] = self.size
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213 return ret
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214
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215
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216 @interface.implementer(IStreamProducer)
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217 @interface.implementer(interfaces.IConsumer)
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218 class FileStreamObject(basic.FileSender):
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219 def __init__(self, host, client, path, **kwargs):
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220 """
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221
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222 A SatFile will be created and put in self.file_obj
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223 @param path(unicode): path to the file
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224 @param **kwargs: kw arguments to pass to SatFile
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225 """
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226 self.file_obj = SatFile(host, client, path, **kwargs)
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227
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228 def registerProducer(self, producer, streaming):
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229 pass
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230
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231 def startStream(self, consumer):
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232 return self.beginFileTransfer(self.file_obj, consumer)
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233
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234 def write(self, data):
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235 self.file_obj.write(data)
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236
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237 def close(self, *args, **kwargs):
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238 self.file_obj.close(*args, **kwargs)