Mercurial > libervia-backend

annotate sat/tools/stream.py @ 2862:b2e898384c25

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quick_frontend (app): progress callbacks handling: in addition to listeners, a frontend can now register progression callback and errback which are called when the given progressing action is finished. Those callbacks can be registered using registerProgressCbs or specified in actionManager.
author Goffi <goffi@goffi.org>
date Wed, 20 Mar 2019 09:08:47 +0100
parents 003b8b4b56a7
children 8ce5748bfe97
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rev   line source
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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) 2009-2019 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)