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annotate sat/tools/stream.py @ 3087:a51f7fce1e2c

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tools (stream): data modification on SatFile: - if `data_cb` is used and if it returns a not None value, it is used instead of the data read from the file. This allows data modification on the fly, useful notably for encryption - new `check_size_with_read` argument which check size on `close()` using amount of data actually read/written instead of file size. This avoid a warning when file is modified on the fly - added `closed` attribute
author Goffi <goffi@goffi.org>
date Fri, 20 Dec 2019 12:28:04 +0100
parents ab2696e34d29
children 9d0df638c8b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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)