Mercurial > libervia-web

annotate libervia/pages/_browser/cache.py @ 1466:cff720e26089

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pages (blog/view): activate pagination when a single item is shown: `previous_page_url` and `next_page_url` are set when `item_id` is used. For now, they are both activated even if there is no item before or after, as it would request to make extra request to check it. This may be improved in 0.9 by using internal cache. fix 399
author Goffi <goffi@goffi.org>
date Thu, 30 Sep 2021 17:04:22 +0200
parents 7472d5a88006
children 106bae41f5c8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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