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annotate libervia/web/server/utils.py @ 1611:b695b98851fc

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pages (events/new): use coroutines.
author Goffi <goffi@goffi.org>
date Wed, 12 Jun 2024 23:09:49 +0200
parents eb00d593801d
children
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1 #!/usr/bin/env python3
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2
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3
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4 # Libervia: a Salut à Toi frontend
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5 # Copyright (C) 2011-2021 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 libervia.backend.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 libervia.backend.core import exceptions
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23 from libervia.backend.core.log import getLogger
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24 import urllib.request, urllib.parse, urllib.error
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25
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26 log = getLogger(__name__)
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27
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28
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29 def quote(value, safe="@"):
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30 """shortcut to quote an unicode value for URL"""
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31 return urllib.parse.quote(value, safe=safe)
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32
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33
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34 class ProgressHandler(object):
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35 """class to help the management of progressions"""
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36
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37 handlers = {}
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38
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39 def __init__(self, host, progress_id, profile):
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40 self.host = host
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41 self.progress_id = progress_id
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42 self.profile = profile
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43
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44 @classmethod
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45 def _signal(cls, name, progress_id, data, profile):
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46 handlers = cls.handlers
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47 if profile in handlers and progress_id in handlers[profile]:
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48 handler_data = handlers[profile][progress_id]
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49 timeout = handler_data["timeout"]
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50 if timeout.active():
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51 timeout.cancel()
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52 cb = handler_data[name]
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53 if cb is not None:
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54 cb(data)
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55 if name == "started":
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56 pass
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57 elif name == "finished":
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58 handler_data["deferred"].callback(data)
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59 handler_data["instance"].unregister_handler()
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60 elif name == "error":
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61 handler_data["deferred"].errback(Exception(data))
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62 handler_data["instance"].unregister_handler()
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63 else:
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64 log.error("unexpected signal: {name}".format(name=name))
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65
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66 def _timeout(self):
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67 log.warning(
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68 _(
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69 "No progress received, cancelling handler: {progress_id} [{profile}]"
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70 ).format(progress_id=self.progress_id, profile=self.profile)
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71 )
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72
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73 def unregister_handler(self):
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74 """remove a previously registered handler"""
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75 try:
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76 del self.handlers[self.profile][self.progress_id]
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77 except KeyError:
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78 log.warning(
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79 _("Trying to remove unknown handler: {progress_id} [{profile}]").format(
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80 progress_id=self.progress_id, profile=self.profile
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81 )
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82 )
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83 else:
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84 if not self.handlers[self.profile]:
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85 self.handlers[self.profile]
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86
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87 def register(self, started_cb=None, finished_cb=None, error_cb=None, timeout=30):
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88 """register the signals to handle progression
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89
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90 @param started_cb(callable, None): method to call when progress_started signal is received
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91 @param finished_cb(callable, None): method to call when progress_finished signal is received
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92 @param error_cb(callable, None): method to call when progress_error signal is received
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93 @param timeout(int): progress time out
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94 if nothing happen in this progression during this delay,
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95 an exception is raised
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96 @return (D(dict[unicode,unicode])): a deferred called when progression is finished
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97 """
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98 handler_data = self.handlers.setdefault(self.profile, {}).setdefault(
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99 self.progress_id, {}
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100 )
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101 if handler_data:
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102 raise exceptions.ConflictError(
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103 "There is already one handler for this progression"
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104 )
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105 handler_data["instance"] = self
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106 deferred = handler_data["deferred"] = defer.Deferred()
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107 handler_data["started"] = started_cb
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108 handler_data["finished"] = finished_cb
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109 handler_data["error"] = error_cb
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110 handler_data["timeout"] = reactor.callLater(timeout, self._timeout)
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111 return deferred
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113
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114 class SubPage(str):
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115 """use to mark subpages when generating a page path"""