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annotate libervia/backend/tools/stream.py @ 4113:3f59a2b141cc

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doc (installation): update `pipx` instruction and remove `requirements.txt` mention
author Goffi <goffi@goffi.org>
date Wed, 09 Aug 2023 00:48:11 +0200
parents 7c5654c54fed
children 0d7bb4df2343
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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 from argparse import OPTIONAL
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22 from pathlib import Path
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23 from typing import Callable, Optional, Union
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24 import uuid
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25 import os
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26 from zope import interface
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27 from libervia.backend.core import exceptions
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28 from libervia.backend.core.constants import Const as C
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29 from libervia.backend.core.core_types import SatXMPPEntity
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30 from libervia.backend.core.log import getLogger
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31 from twisted.protocols import basic
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32 from twisted.internet import interfaces
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33
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34 from libervia.backend.core.main import LiberviaBackend
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35
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36 log = getLogger(__name__)
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37
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38
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39 class IStreamProducer(interface.Interface):
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40 def start_stream(consumer):
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41 """start producing the stream
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42
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43 @return (D): deferred fired when stream is finished
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44 """
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45 pass
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46
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47
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48 class SatFile:
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49 """A file-like object to have high level files manipulation"""
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50
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51 # TODO: manage "with" statement
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52
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53 def __init__(
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54 self,
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55 host: LiberviaBackend,
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56 client: SatXMPPEntity,
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57 path: Union[str, Path],
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58 mode: str = "rb",
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59 uid: Optional[str] = None,
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60 size: Optional[int] = None,
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61 data_cb: Optional[Callable] = None,
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62 auto_end_signals: bool = True,
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63 check_size_with_read: bool = False,
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64 pre_close_cb: Optional[Callable]=None
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65 ) -> None:
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66 """
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67 @param host: %(doc_host)s
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68 @param path(Path, str): path to the file to get or write to
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69 @param mode(str): same as for built-in "open" function
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70 @param uid(unicode, None): unique id identifing this progressing element
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71 This uid will be used with self.host.progress_get
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72 will be automaticaly generated if None
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73 @param size(None, int): size of the file (when known in advance)
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74 @param data_cb(None, callable): method to call on each data read/write
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75 can be used to do processing like calculating hash.
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76 if data_cb return a non None value, it will be used instead of the
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77 data read/to write
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78 @param auto_end_signals(bool): if True, progress_finished and progress_error signals
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79 are automatically sent.
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80 if False, you'll have to call self.progress_finished and self.progress_error
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81 yourself.
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82 progress_started signal is always sent automatically
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83 @param check_size_with_read(bool): if True, size will be checked using number of
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84 bytes read or written. This is useful when data_cb modifiy len of file.
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85 @param pre_close_cb:
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86 """
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87 self.host = host
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88 self.profile = client.profile
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89 self.uid = uid or str(uuid.uuid4())
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90 self._file = open(path, mode)
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91 self.size = size
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92 self.data_cb = data_cb
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93 self.auto_end_signals = auto_end_signals
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94 self.pre_close_cb = pre_close_cb
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95 metadata = self.get_progress_metadata()
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96 self.host.register_progress_cb(
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97 self.uid, self.get_progress, metadata, profile=client.profile
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98 )
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99 self.host.bridge.progress_started(self.uid, metadata, client.profile)
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100
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101 self._transfer_count = 0 if check_size_with_read else None
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102
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103 @property
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104 def check_size_with_read(self):
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105 return self._transfer_count is not None
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106
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107 @check_size_with_read.setter
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108 def check_size_with_read(self, value):
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109 if value and self._transfer_count is None:
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110 self._transfer_count = 0
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111 else:
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112 self._transfer_count = None
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113
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114 def check_size(self):
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115 """Check that current size correspond to given size
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116
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117 must be used when the transfer is supposed to be finished
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118 @return (bool): True if the position is the same as given size
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119 @raise exceptions.NotFound: size has not be specified
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120 """
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121 if self.check_size_with_read:
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122 position = self._transfer_count
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123 else:
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124 position = self._file.tell()
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125 if self.size is None:
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126 raise exceptions.NotFound
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127 return position == self.size
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128
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129 def close(self, progress_metadata=None, error=None):
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130 """Close the current file
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131
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132 @param progress_metadata(None, dict): metadata to send with _onProgressFinished
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133 message
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134 @param error(None, unicode): set to an error message if progress was not
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135 successful
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136 mutually exclusive with progress_metadata
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137 error can happen even if error is None, if current size differ from given size
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138 """
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139 if self._file.closed:
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140 return # avoid double close (which is allowed) error
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141 if self.pre_close_cb is not None:
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142 self.pre_close_cb()
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143 if error is None:
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144 try:
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145 size_ok = self.check_size()
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146 except exceptions.NotFound:
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147 size_ok = True
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148 if not size_ok:
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149 error = "declared and actual size mismatch"
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150 log.warning(error)
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151 progress_metadata = None
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152
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153 self._file.close()
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154
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155 if self.auto_end_signals:
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156 if error is None:
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157 self.progress_finished(progress_metadata)
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158 else:
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159 assert progress_metadata is None
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160 self.progress_error(error)
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161
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162 self.host.remove_progress_cb(self.uid, self.profile)
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163 if error is not None:
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164 log.error(f"file {self._file} closed with an error: {error}")
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165
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166 @property
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167 def closed(self):
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168 return self._file.closed
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169
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170 def progress_finished(self, metadata=None):
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171 if metadata is None:
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172 metadata = {}
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173 self.host.bridge.progress_finished(self.uid, metadata, self.profile)
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174
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175 def progress_error(self, error):
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176 self.host.bridge.progress_error(self.uid, error, self.profile)
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177
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178 def flush(self):
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179 self._file.flush()
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180
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181 def write(self, buf):
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182 if self.data_cb is not None:
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183 ret = self.data_cb(buf)
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184 if ret is not None:
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185 buf = ret
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186 if self._transfer_count is not None:
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187 self._transfer_count += len(buf)
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188 self._file.write(buf)
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189
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190 def read(self, size=-1):
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191 read = self._file.read(size)
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192 if self.data_cb is not None:
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193 ret = self.data_cb(read)
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194 if ret is not None:
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195 read = ret
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196 if self._transfer_count is not None:
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197 self._transfer_count += len(read)
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198 return read
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199
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200 def seek(self, offset, whence=os.SEEK_SET):
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201 self._file.seek(offset, whence)
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202
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203 def tell(self):
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204 return self._file.tell()
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205
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206 @property
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207 def mode(self):
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208 return self._file.mode
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209
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210 def get_progress_metadata(self):
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211 """Return progression metadata as given to progress_started
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212
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213 @return (dict): metadata (check bridge for documentation)
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214 """
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215 metadata = {"type": C.META_TYPE_FILE}
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216
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217 mode = self._file.mode
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218 if "+" in mode:
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219 pass # we have no direction in read/write modes
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220 elif mode in ("r", "rb"):
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221 metadata["direction"] = "out"
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222 elif mode in ("w", "wb"):
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223 metadata["direction"] = "in"
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224 elif "U" in mode:
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225 metadata["direction"] = "out"
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226 else:
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227 raise exceptions.InternalError
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228
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229 metadata["name"] = self._file.name
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230
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231 return metadata
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232
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233 def get_progress(self, progress_id, profile):
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234 ret = {"position": self._file.tell()}
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235 if self.size:
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236 ret["size"] = self.size
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237 return ret
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238
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239
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240 @interface.implementer(IStreamProducer)
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241 @interface.implementer(interfaces.IConsumer)
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242 class FileStreamObject(basic.FileSender):
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243 def __init__(self, host, client, path, **kwargs):
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244 """
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245
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246 A SatFile will be created and put in self.file_obj
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247 @param path(unicode): path to the file
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248 @param **kwargs: kw arguments to pass to SatFile
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249 """
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250 self.file_obj = SatFile(host, client, path, **kwargs)
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251
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252 def registerProducer(self, producer, streaming):
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253 pass
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254
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255 def start_stream(self, consumer):
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256 return self.beginFileTransfer(self.file_obj, consumer)
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257
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258 def write(self, data):
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parents:
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259 self.file_obj.write(data)
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parents:
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260
e2a7bb875957 plugin pipe/stream, file transfert: refactoring and improvments:
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261 def close(self, *args, **kwargs):
e2a7bb875957 plugin pipe/stream, file transfert: refactoring and improvments:
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parents:
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262 self.file_obj.close(*args, **kwargs)