annotate sat/tools/stream.py @ 3728:b15644cae50d

component AP gateway: JID/node ⟺ AP outbox conversion: - convert a combination of JID and optional pubsub node to AP actor handle (see `getJIDAndNode` for details) and vice versa - the gateway now provides a Pubsub service - retrieve pubsub node and convert it to AP collection, AP pagination is converted to RSM - do the opposite: convert AP collection to pubsub and handle RSM request. Due to ActivityStream collection pagination limitations, some RSM request produce inefficient requests, but caching should be used most of the time in the future and avoid the problem. - set specific name to HTTP Server - new `local_only` setting (`True` by default) to indicate if the gateway can request or not XMPP Pubsub nodes from other servers - disco info now specifies important features such as Pubsub RSM, and nodes metadata ticket 363
author Goffi <goffi@goffi.org>
date Tue, 25 Jan 2022 17:54:06 +0100
parents 7550ae9cfbac
children e4631d073c8b
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rev   line source
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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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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)