Mercurial > libervia-web

annotate libervia/pages/_browser/cache.py @ 1433:1a5410981c45

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pages: get last page by default with RSM: When `max_items` is not used, Pubsub (and thus RSM) is actually returning results in chronological order. As most of time we want latest items first, `getPubsubExtra` now set `before` to get last page by default (the one with most recent items).
author Goffi <goffi@goffi.org>
date Sun, 06 Jun 2021 19:40:07 +0200
parents 7472d5a88006
children 106bae41f5c8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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ed28ad7d484c browser (cache): new `cache` module to handle cache of roster and identities:
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1 from browser import window
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2 from browser.local_storage import storage
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3 from javascript import JSON
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4 from dialog import notification
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5 from bridge import Bridge
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6
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7 session_uuid = window.session_uuid
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8 bridge = Bridge()
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9
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10 # XXX: we don't use browser.object_storage because it is affected by
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11 # https://github.com/brython-dev/brython/issues/1467 and mixing local_storage.storage
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12 # and object_storage was resulting in weird behaviour (keys found in one not in the
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13 # other)
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14
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15
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16 class Cache:
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17
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18 def __init__(self):
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19 try:
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20 cache = storage['libervia_cache']
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21 except KeyError:
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22 self.request_data_from_backend()
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23 else:
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24 cache = JSON.parse(cache)
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25 if cache['metadata']['session_uuid'] != session_uuid:
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26 print("data in cache are not valid for this session, resetting")
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27 del storage['libervia_cache']
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28 self.request_data_from_backend()
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29 else:
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30 self._cache = cache
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31 print("storage cache is used")
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32
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33 @property
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34 def roster(self):
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35 return self._cache['roster']
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36
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37 @property
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38 def identities(self):
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39 return self._cache['identities']
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40
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41 def update(self):
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42 # FIXME: we use window.JSON as a workaround to
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43 # https://github.com/brython-dev/brython/issues/1467
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44 print(f"updating: {self._cache}")
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45 storage['libervia_cache'] = window.JSON.stringify(self._cache)
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46 print("cache stored")
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47
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48 def _store_if_complete(self):
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49 self._completed_count -= 1
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50 if self._completed_count == 0:
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51 del self._completed_count
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52 self.update()
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53
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54 def getContactsCb(self, contacts):
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55 print("roster received")
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56 roster = self._cache['roster']
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57 for contact_jid, attributes, groups in contacts:
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58 roster[contact_jid] = {
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59 'attributes': attributes,
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60 'groups': groups,
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61 }
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62 self._store_if_complete()
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63
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64 def identitiesBaseGetCb(self, identities_raw):
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65 print("base identities received")
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66 identities = JSON.parse(identities_raw)
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67 self._cache['identities'].update(identities)
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68 self._store_if_complete()
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69
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70 def request_failed(self, exc, message):
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71 notification.show(message.format(exc=exc), "error")
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72 self._store_if_complete()
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73
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74 def request_data_from_backend(self):
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75 self._cache = {
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76 'metadata': {
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77 "session_uuid": session_uuid,
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78 },
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79 'roster': {},
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80 'identities': {},
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81 }
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82 self._completed_count = 2
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83 print("requesting roster to backend")
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84 bridge.getContacts(
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85 callback=self.getContactsCb,
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86 errback=lambda e: self.request_failed(e, "Can't get contacts: {exc}")
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87 )
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88 print("requesting base identities to backend")
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89 bridge.identitiesBaseGet(
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90 callback=self.identitiesBaseGetCb,
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91 errback=lambda e: self.request_failed(e, "Can't get base identities: {exc}")
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92 )
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93
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94 def _fill_identities_cb(self, new_identities_raw, callback):
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95 new_identities = JSON.parse(new_identities_raw)
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96 print(f"new identities: {new_identities.keys()}")
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97 self._cache['identities'].update(new_identities)
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98 self.update()
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99 if callback:
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100 callback()
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101
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102 def fill_identities(self, entities, callback=None):
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103 """Check that identities for entities exist, request them otherwise"""
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104 to_get = {e for e in entities if e not in self._cache['identities']}
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105 if to_get:
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106 bridge.identitiesGet(
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107 list(to_get),
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108 ['avatar', 'nicknames'],
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109 callback=lambda identities: self._fill_identities_cb(
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110 identities, callback),
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111 errback=lambda failure_: notification.show(
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112 f"Can't get identities: {failure_}",
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113 "error"
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114 )
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115 )
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116 else:
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117 # we already have all identities
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118 print("no missing identity")
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119 if callback:
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120 callback()
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121
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122 def match_identity(self, entity_jid, text, identity=None):
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123 """Returns True if a text match an entity identity
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124
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125 identity will be matching if its jid or any of its name contain text
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126 @param entity_jid: jid of the entity to check
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127 @param text: text to use for filtering. Must be in lowercase and stripped
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128 @param identity: identity data
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129 if None, it will be retrieved if jid is not matching
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130 @return: True if entity is matching
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131 """
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132 if text in entity_jid:
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133 return True
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134 if identity is None:
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135 try:
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136 identity = self.identities[entity_jid]
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137 except KeyError:
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138 print(f"missing identity: {entity_jid}")
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139 return False
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140 return any(text in n.lower() for n in identity['nicknames'])
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141
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142 def matching_identities(self, text):
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143 """Return identities corresponding to a text
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144
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145 """
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146 text = text.lower().strip()
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147 for entity_jid, identity in self._cache['identities'].items():
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148 if ((text in entity_jid
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149 or any(text in n.lower() for n in identity['nicknames'])
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150 )):
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151 yield entity_jid
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152
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153
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154 cache = Cache()
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155 roster = cache.roster
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156 identities = cache.identities