annotate sat/tools/stream.py @ 2718:bb6adaa580ee

plugin XEP-0313, XEP-0045: loop MAM requests until whole archive is retrieved: - plugin xep-0313: new serialise method - : getArchives now returns an extra mam_response dict with "complete" and "stable" status - : MAMGet now return a new metadata dict before profile (with serialised RSM and MAM response)
author Goffi <goffi@goffi.org>
date Mon, 10 Dec 2018 20:34:45 +0100
parents 56f94936df1e
children 003b8b4b56a7
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2018 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 """ interfaces """
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21
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22 from sat.core import exceptions
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23 from sat.core.constants import Const as C
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24 from sat.core.log import getLogger
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25 from twisted.protocols import basic
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26 from twisted.internet import interfaces
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27 from zope import interface
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28 import uuid
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29 import os
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30
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31 log = getLogger(__name__)
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32
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33
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34 class IStreamProducer(interface.Interface):
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35 def startStream(consumer):
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36 """start producing the stream
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37
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38 @return (D): deferred fired when stream is finished
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39 """
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40
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41
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42 class SatFile(object):
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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__(
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48 self,
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49 host,
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50 client,
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51 path,
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52 mode="rb",
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53 uid=None,
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54 size=None,
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55 data_cb=None,
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56 auto_end_signals=True,
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57 ):
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58 """
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59 @param host: %(doc_host)s
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60 @param path(str): path of the file to get
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61 @param mode(str): same as for built-in "open" function
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62 @param uid(unicode, None): unique id identifing this progressing element
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63 This uid will be used with self.host.progressGet
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64 will be automaticaly generated if None
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65 @param size(None, int): size of the file (when known in advance)
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66 @param data_cb(None, callable): method to call on each data read/write
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67 mainly useful to do things like calculating hash
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68 @param auto_end_signals(bool): if True, progressFinished and progressError signals are automatically sent
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69 if False, you'll have to call self.progressFinished and self.progressError yourself
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70 progressStarted signal is always sent automatically
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71 """
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72 self.host = host
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73 self.profile = client.profile
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74 self.uid = uid or unicode(uuid.uuid4())
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75 self._file = open(path, mode)
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76 self.size = size
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77 self.data_cb = data_cb
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78 self.auto_end_signals = auto_end_signals
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79 metadata = self.getProgressMetadata()
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80 self.host.registerProgressCb(
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81 self.uid, self.getProgress, metadata, profile=client.profile
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82 )
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83 self.host.bridge.progressStarted(self.uid, metadata, client.profile)
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84
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85 def checkSize(self):
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86 """Check that current size correspond to given size
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87
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88 must be used when the transfer is supposed to be finished
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89 @return (bool): True if the position is the same as given size
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90 @raise exceptions.NotFound: size has not be specified
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91 """
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92 position = self._file.tell()
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93 if self.size is None:
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94 raise exceptions.NotFound
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95 return position == self.size
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96
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97 def close(self, progress_metadata=None, error=None):
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98 """Close the current file
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99
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100 @param progress_metadata(None, dict): metadata to send with _onProgressFinished message
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101 @param error(None, unicode): set to an error message if progress was not successful
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102 mutually exclusive with progress_metadata
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103 error can happen even if error is None, if current size differ from given size
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104 """
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105 if self._file.closed:
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106 return # avoid double close (which is allowed) error
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107 if error is None:
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108 try:
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109 size_ok = self.checkSize()
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110 except exceptions.NotFound:
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111 size_ok = True
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112 if not size_ok:
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113 error = u"declared and actual size mismatch"
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114 log.warning(error)
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115 progress_metadata = None
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116
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117 self._file.close()
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118
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119 if self.auto_end_signals:
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120 if error is None:
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121 self.progressFinished(progress_metadata)
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122 else:
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123 assert progress_metadata is None
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124 self.progressError(error)
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125
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126 self.host.removeProgressCb(self.uid, self.profile)
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127
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128 def progressFinished(self, metadata=None):
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129 if metadata is None:
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130 metadata = {}
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131 self.host.bridge.progressFinished(self.uid, metadata, self.profile)
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132
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133 def progressError(self, error):
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134 self.host.bridge.progressError(self.uid, error, self.profile)
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135
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136 def flush(self):
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137 self._file.flush()
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138
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139 def write(self, buf):
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140 self._file.write(buf)
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141 if self.data_cb is not None:
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142 return self.data_cb(buf)
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143
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144 def read(self, size=-1):
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145 read = self._file.read(size)
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146 if self.data_cb is not None and read:
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147 self.data_cb(read)
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148 return read
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149
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150 def seek(self, offset, whence=os.SEEK_SET):
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151 self._file.seek(offset, whence)
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152
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153 def tell(self):
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154 return self._file.tell()
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155
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156 def mode(self):
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157 return self._file.mode()
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158
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159 def getProgressMetadata(self):
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160 """Return progression metadata as given to progressStarted
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161
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162 @return (dict): metadata (check bridge for documentation)
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163 """
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164 metadata = {"type": C.META_TYPE_FILE}
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165
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166 mode = self._file.mode
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167 if "+" in mode:
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168 pass # we have no direction in read/write modes
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169 elif mode in ("r", "rb"):
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170 metadata["direction"] = "out"
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171 elif mode in ("w", "wb"):
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172 metadata["direction"] = "in"
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173 elif "U" in mode:
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174 metadata["direction"] = "out"
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175 else:
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176 raise exceptions.InternalError
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177
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178 metadata["name"] = self._file.name
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179
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180 return metadata
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181
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182 def getProgress(self, progress_id, profile):
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183 ret = {"position": self._file.tell()}
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184 if self.size:
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185 ret["size"] = self.size
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186 return ret
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187
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188
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189 @interface.implementer(IStreamProducer)
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190 @interface.implementer(interfaces.IConsumer)
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191 class FileStreamObject(basic.FileSender):
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192 def __init__(self, host, client, path, **kwargs):
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193 """
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194
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195 A SatFile will be created and put in self.file_obj
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196 @param path(unicode): path to the file
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197 @param **kwargs: kw arguments to pass to SatFile
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198 """
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199 self.file_obj = SatFile(host, client, path, **kwargs)
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200
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201 def registerProducer(self, producer, streaming):
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202 pass
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203
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204 def startStream(self, consumer):
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205 return self.beginFileTransfer(self.file_obj, consumer)
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206
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207 def write(self, data):
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208 self.file_obj.write(data)
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209
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210 def close(self, *args, **kwargs):
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211 self.file_obj.close(*args, **kwargs)