Mercurial > libervia-backend

annotate sat/tools/stream.py @ 3118:02492db1ce39

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quick frontend (app): call `getReady` once connected to bridge: namespaces and encryption plugins are only retrieved once backend is ready, else they may not yet be available (can happen notably when the backend is start at the same time as the frontend, e.g. on Android).
author Goffi <goffi@goffi.org>
date Sat, 25 Jan 2020 21:08:26 +0100
parents a51f7fce1e2c
children 9d0df638c8b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python3
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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 import uuid
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23 import os
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24 from zope import interface
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25 from sat.core import exceptions
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26 from sat.core.constants import Const as C
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27 from sat.core.log import getLogger
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28 from twisted.protocols import basic
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29 from twisted.internet import interfaces
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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 pass
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41
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42
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43 class SatFile:
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44 """A file-like object to have high level files manipulation"""
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45
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46 # TODO: manage "with" statement
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47
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48 def __init__(self, host, client, path, mode="rb", uid=None, size=None, data_cb=None,
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49 auto_end_signals=True, check_size_with_read=False):
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50 """
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51 @param host: %(doc_host)s
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52 @param path(Path, str): path to the file to get or write to
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53 @param mode(str): same as for built-in "open" function
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54 @param uid(unicode, None): unique id identifing this progressing element
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55 This uid will be used with self.host.progressGet
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56 will be automaticaly generated if None
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57 @param size(None, int): size of the file (when known in advance)
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58 @param data_cb(None, callable): method to call on each data read/write
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59 can be used to do processing like calculating hash.
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60 if data_cb return a non None value, it will be used instead of the
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61 data read/to write
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62 @param auto_end_signals(bool): if True, progressFinished and progressError signals
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63 are automatically sent.
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64 if False, you'll have to call self.progressFinished and self.progressError
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65 yourself.
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66 progressStarted signal is always sent automatically
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67 @param check_size_with_read(bool): if True, size well be checked using number of
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68 bytes read or written. This is useful when data_cb modifiy len of file.
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69 """
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70 self.host = host
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71 self.profile = client.profile
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72 self.uid = uid or str(uuid.uuid4())
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73 self._file = open(path, mode)
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74 self.size = size
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75 self.data_cb = data_cb
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76 self.auto_end_signals = auto_end_signals
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77 metadata = self.getProgressMetadata()
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78 self.host.registerProgressCb(
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79 self.uid, self.getProgress, metadata, profile=client.profile
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80 )
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81 self.host.bridge.progressStarted(self.uid, metadata, client.profile)
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82
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83 self._transfer_count = 0 if check_size_with_read else None
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84
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85 @property
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86 def check_size_with_read(self):
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87 return self._transfer_count is not None
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88
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89 @check_size_with_read.setter
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90 def check_size_with_read(self, value):
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91 if value and self._transfer_count is None:
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92 self._transfer_count = 0
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93 else:
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94 self._transfer_count = None
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95
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96 def checkSize(self):
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97 """Check that current size correspond to given size
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98
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99 must be used when the transfer is supposed to be finished
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100 @return (bool): True if the position is the same as given size
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101 @raise exceptions.NotFound: size has not be specified
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102 """
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103 if self.check_size_with_read:
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104 position = self._transfer_count
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105 else:
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106 position = self._file.tell()
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107 if self.size is None:
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108 raise exceptions.NotFound
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109 return position == self.size
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110
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111 def close(self, progress_metadata=None, error=None):
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112 """Close the current file
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113
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114 @param progress_metadata(None, dict): metadata to send with _onProgressFinished
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115 message
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116 @param error(None, unicode): set to an error message if progress was not
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117 successful
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118 mutually exclusive with progress_metadata
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119 error can happen even if error is None, if current size differ from given size
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120 """
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121 if self._file.closed:
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122 return # avoid double close (which is allowed) error
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123 if error is None:
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124 try:
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125 size_ok = self.checkSize()
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126 except exceptions.NotFound:
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127 size_ok = True
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128 if not size_ok:
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129 error = "declared and actual size mismatch"
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130 log.warning(error)
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131 progress_metadata = None
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132
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133 self._file.close()
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134
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135 if self.auto_end_signals:
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136 if error is None:
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137 self.progressFinished(progress_metadata)
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138 else:
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139 assert progress_metadata is None
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140 self.progressError(error)
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141
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142 self.host.removeProgressCb(self.uid, self.profile)
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143
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144 @property
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145 def closed(self):
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146 return self._file.closed
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147
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148 def progressFinished(self, metadata=None):
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149 if metadata is None:
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150 metadata = {}
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151 self.host.bridge.progressFinished(self.uid, metadata, self.profile)
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152
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153 def progressError(self, error):
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154 self.host.bridge.progressError(self.uid, error, self.profile)
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155
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156 def flush(self):
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157 self._file.flush()
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158
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159 def write(self, buf):
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160 if self.data_cb is not None:
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161 ret = self.data_cb(buf)
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162 if ret is not None:
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163 buf = ret
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164 if self._transfer_count is not None:
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165 self._transfer_count += len(buf)
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166 self._file.write(buf)
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167
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168 def read(self, size=-1):
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169 read = self._file.read(size)
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170 if self.data_cb is not None:
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171 ret = self.data_cb(read)
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172 if ret is not None:
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173 read = ret
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174 if self._transfer_count is not None:
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175 self._transfer_count += len(read)
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176 return read
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177
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178 def seek(self, offset, whence=os.SEEK_SET):
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179 self._file.seek(offset, whence)
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180
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181 def tell(self):
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182 return self._file.tell()
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183
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184 def mode(self):
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185 return self._file.mode()
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186
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187 def getProgressMetadata(self):
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188 """Return progression metadata as given to progressStarted
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189
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190 @return (dict): metadata (check bridge for documentation)
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191 """
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192 metadata = {"type": C.META_TYPE_FILE}
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193
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194 mode = self._file.mode
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195 if "+" in mode:
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196 pass # we have no direction in read/write modes
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197 elif mode in ("r", "rb"):
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198 metadata["direction"] = "out"
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199 elif mode in ("w", "wb"):
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200 metadata["direction"] = "in"
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201 elif "U" in mode:
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202 metadata["direction"] = "out"
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203 else:
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204 raise exceptions.InternalError
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205
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206 metadata["name"] = self._file.name
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207
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208 return metadata
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209
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210 def getProgress(self, progress_id, profile):
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211 ret = {"position": self._file.tell()}
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212 if self.size:
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213 ret["size"] = self.size
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214 return ret
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215
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216
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217 @interface.implementer(IStreamProducer)
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218 @interface.implementer(interfaces.IConsumer)
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219 class FileStreamObject(basic.FileSender):
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220 def __init__(self, host, client, path, **kwargs):
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221 """
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222
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223 A SatFile will be created and put in self.file_obj
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224 @param path(unicode): path to the file
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225 @param **kwargs: kw arguments to pass to SatFile
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226 """
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227 self.file_obj = SatFile(host, client, path, **kwargs)
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228
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229 def registerProducer(self, producer, streaming):
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230 pass
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231
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232 def startStream(self, consumer):
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233 return self.beginFileTransfer(self.file_obj, consumer)
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234
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235 def write(self, data):
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236 self.file_obj.write(data)
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237
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238 def close(self, *args, **kwargs):
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239 self.file_obj.close(*args, **kwargs)