Mercurial > libervia-backend
annotate sat/tools/stream.py @ 2590:bd9d92bc0d6c
quick frontends (app): retrieve namespaces on startup
author | Goffi <goffi@goffi.org> |
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date | Tue, 22 May 2018 10:07:33 +0200 |
parents | 26edcf3a30eb |
children | 56f94936df1e |
rev | line source |
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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) |