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annotate src/server/utils.py @ 1080:2c2b8c08e6c9

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author Goffi <goffi@goffi.org>
date Tue, 27 Mar 2018 08:36:37 +0200
parents 808ec98de8b3
children 63ed5f6bd4eb
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # Libervia: a Salut à Toi frontend
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5 # Copyright (C) 2011-2018 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 from sat.core.i18n import _
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20 from twisted.internet import reactor
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21 from twisted.internet import defer
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22 from sat.core import exceptions
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23 from sat.core.log import getLogger
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24 import urllib
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25 log = getLogger(__name__)
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26
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27
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28 def quote(value, safe='@'):
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29 """shortcut to quote an unicode value for URL"""
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30 return urllib.quote(value.encode('utf-8'), safe=safe)
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31
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32
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33 class ProgressHandler(object):
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34 """class to help the management of progressions"""
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35 handlers = {}
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36
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37 def __init__(self, host, progress_id, profile):
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38 self.host = host
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39 self.progress_id = progress_id
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40 self.profile = profile
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41
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42 @classmethod
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43 def _signal(cls, name, progress_id, data, profile):
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44 handlers = cls.handlers
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45 if profile in handlers and progress_id in handlers[profile]:
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46 handler_data = handlers[profile][progress_id]
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47 timeout = handler_data[u'timeout']
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48 if timeout.active():
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49 timeout.cancel()
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50 cb = handler_data[name]
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51 if cb is not None:
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52 cb(data)
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53 if name == u'started':
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54 pass
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55 elif name == u'finished':
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56 handler_data[u'deferred'].callback(data)
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57 handler_data[u'instance'].unregister_handler()
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58 elif name == u'error':
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59 handler_data[u'deferred'].errback(Exception(data))
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60 handler_data[u'instance'].unregister_handler()
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61 else:
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62 log.error(u'unexpected signal: {name}'.format(name=name))
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63
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64 def _timeout(self):
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65 log.warning(_(u"No progress received, cancelling handler: {progress_id} [{profile}]").format(
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66 progress_id = self.progress_id, profile = self.profile))
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67
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68 def unregister_handler(self):
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69 """remove a previously registered handler"""
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70 try:
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71 del self.handlers[self.profile][self.progress_id]
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72 except KeyError:
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73 log.warning(_(u"Trying to remove unknown handler: {progress_id} [{profile}]").format(
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74 progress_id = self.progress_id, profile = self.profile))
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75 else:
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76 if not self.handlers[self.profile]:
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77 self.handlers[self.profile]
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78
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79 def register(self, started_cb=None, finished_cb=None, error_cb=None, timeout=30):
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80 """register the signals to handle progression
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81
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82 @param started_cb(callable, None): method to call when progressStarted signal is received
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83 @param finished_cb(callable, None): method to call when progressFinished signal is received
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84 @param error_cb(callable, None): method to call when progressError signal is received
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85 @param timeout(int): progress time out
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86 if nothing happen in this progression during this delay,
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87 an exception is raised
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88 @return (D(dict[unicode,unicode])): a deferred called when progression is finished
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89 """
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90 handler_data = self.handlers.setdefault(self.profile, {}).setdefault(self.progress_id, {})
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91 if handler_data:
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92 raise exceptions.ConflictError(u"There is already one handler for this progression")
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93 handler_data[u'instance'] = self
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94 deferred = handler_data[u'deferred'] = defer.Deferred()
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95 handler_data[u'started'] = started_cb
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96 handler_data[u'finished'] = finished_cb
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97 handler_data[u'error'] = error_cb
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98 handler_data[u'timeout'] = reactor.callLater(timeout, self._timeout)
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99 return deferred