Mercurial > libervia-backend

annotate src/tools/stream.py @ 2494:d1df08c79a5d

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core (constants): new constants to handle files, progress, component, permissions (will be used in the upcoming patches)
author Goffi <goffi@goffi.org>
date Wed, 28 Feb 2018 18:28:39 +0100
parents e2a7bb875957
children
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rev   line source
2489
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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
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36 def startStream(consumer):
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37 """start producing the stream
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38
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39 @return (D): deferred fired when stream is finished
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40 """
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41
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42
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43 class SatFile(object):
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44 """A file-like object to have high level files manipulation"""
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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, auto_end_signals=True):
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48 """
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49 @param host: %(doc_host)s
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50 @param path(str): path of the file to get
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51 @param mode(str): same as for built-in "open" function
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52 @param uid(unicode, None): unique id identifing this progressing element
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53 This uid will be used with self.host.progressGet
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54 will be automaticaly generated if None
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55 @param size(None, int): size of the file (when known in advance)
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56 @param data_cb(None, callable): method to call on each data read/write
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57 mainly useful to do things like calculating hash
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58 @param auto_end_signals(bool): if True, progressFinished and progressError signals are automatically sent
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59 if False, you'll have to call self.progressFinished and self.progressError yourself
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60 progressStarted signal is always sent automatically
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61 """
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62 self.host = host
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63 self.profile = client.profile
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64 self.uid = uid or unicode(uuid.uuid4())
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65 self._file = open(path, mode)
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66 self.size = size
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67 self.data_cb = data_cb
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68 self.auto_end_signals = auto_end_signals
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69 metadata = self.getProgressMetadata()
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70 self.host.registerProgressCb(self.uid, self.getProgress, metadata, profile=client.profile)
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71 self.host.bridge.progressStarted(self.uid, metadata, client.profile)
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72
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73 def checkSize(self):
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74 """Check that current size correspond to given size
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75
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76 must be used when the transfer is supposed to be finished
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77 @return (bool): True if the position is the same as given size
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78 @raise exceptions.NotFound: size has not be specified
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79 """
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80 position = self._file.tell()
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81 if self.size is None:
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82 raise exceptions.NotFound
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83 return position == self.size
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84
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85 def close(self, progress_metadata=None, error=None):
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86 """Close the current file
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87
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88 @param progress_metadata(None, dict): metadata to send with _onProgressFinished message
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89 @param error(None, unicode): set to an error message if progress was not successful
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90 mutually exclusive with progress_metadata
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91 error can happen even if error is None, if current size differ from given size
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92 """
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93 if self._file.closed:
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94 return # avoid double close (which is allowed) error
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95 if error is None:
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96 try:
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97 size_ok = self.checkSize()
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98 except exceptions.NotFound:
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99 size_ok = True
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100 if not size_ok:
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101 error = u'declared and actual size mismatch'
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102 log.warning(error)
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103 progress_metadata = None
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104
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105 self._file.close()
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106
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107 if self.auto_end_signals:
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108 if error is None:
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109 self.progressFinished(progress_metadata)
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110 else:
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111 assert progress_metadata is None
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112 self.progressError(error)
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113
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114 self.host.removeProgressCb(self.uid, self.profile)
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115
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116 def progressFinished(self, metadata=None):
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117 if metadata is None:
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118 metadata = {}
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119 self.host.bridge.progressFinished(self.uid, metadata, self.profile)
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120
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121 def progressError(self, error):
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122 self.host.bridge.progressError(self.uid, error, self.profile)
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123
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124 def flush(self):
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125 self._file.flush()
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126
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127 def write(self, buf):
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128 self._file.write(buf)
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129 if self.data_cb is not None:
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130 return self.data_cb(buf)
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131
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132 def read(self, size=-1):
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133 read = self._file.read(size)
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134 if self.data_cb is not None and read:
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135 self.data_cb(read)
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136 return read
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137
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138 def seek(self, offset, whence=os.SEEK_SET):
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139 self._file.seek(offset, whence)
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140
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141 def tell(self):
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142 return self._file.tell()
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143
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144 def mode(self):
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145 return self._file.mode()
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146
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147 def getProgressMetadata(self):
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148 """Return progression metadata as given to progressStarted
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149
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150 @return (dict): metadata (check bridge for documentation)
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151 """
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152 metadata = {'type': C.META_TYPE_FILE}
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153
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154 mode = self._file.mode
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155 if '+' in mode:
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156 pass # we have no direction in read/write modes
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157 elif mode in ('r', 'rb'):
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158 metadata['direction'] = 'out'
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159 elif mode in ('w', 'wb'):
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160 metadata['direction'] = 'in'
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161 elif 'U' in mode:
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162 metadata['direction'] = 'out'
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163 else:
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164 raise exceptions.InternalError
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165
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166 metadata['name'] = self._file.name
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167
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168 return metadata
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169
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170 def getProgress(self, progress_id, profile):
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171 ret = {'position': self._file.tell()}
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172 if self.size:
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173 ret['size'] = self.size
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174 return ret
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175
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176
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177 @interface.implementer(IStreamProducer)
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178 @interface.implementer(interfaces.IConsumer)
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179 class FileStreamObject(basic.FileSender):
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180
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181 def __init__(self, host, client, path, **kwargs):
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182 """
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183
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184 A SatFile will be created and put in self.file_obj
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185 @param path(unicode): path to the file
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186 @param **kwargs: kw arguments to pass to SatFile
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187 """
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188 self.file_obj = SatFile(host, client, path, **kwargs)
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189
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190 def registerProducer(self, producer, streaming):
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191 pass
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192
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193 def startStream(self, consumer):
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194 return self.beginFileTransfer(self.file_obj, consumer)
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195
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196 def write(self, data):
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197 self.file_obj.write(data)
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198
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199 def close(self, *args, **kwargs):
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200 self.file_obj.close(*args, **kwargs)