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annotate sat/plugins/plugin_xep_0059.py @ 3592:ef144aaea2bb

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plugin XEP-0059: new `getNextRequest` method to generate request to retrieve next page
author Goffi <goffi@goffi.org>
date Thu, 29 Jul 2021 21:30:32 +0200
parents be6d91572633
children 766729ac4146
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python3
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2
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3 # Result Set Management (XEP-0059)
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4 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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5 # Copyright (C) 2013-2016 Adrien Cossa (souliane@mailoo.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 from typing import Optional
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21 from zope.interface import implementer
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22 from twisted.words.protocols.jabber import xmlstream
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23 from wokkel import disco
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24 from wokkel import iwokkel
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25 from wokkel import rsm
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26 from sat.core.i18n import _
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27 from sat.core.constants import Const as C
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28 from sat.core.log import getLogger
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29
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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 PLUGIN_INFO = {
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35 C.PI_NAME: "Result Set Management",
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36 C.PI_IMPORT_NAME: "XEP-0059",
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37 C.PI_TYPE: "XEP",
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38 C.PI_PROTOCOLS: ["XEP-0059"],
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39 C.PI_MAIN: "XEP_0059",
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40 C.PI_HANDLER: "yes",
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41 C.PI_DESCRIPTION: _("""Implementation of Result Set Management"""),
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42 }
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43
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44 RSM_PREFIX = "rsm_"
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45
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46
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47 class XEP_0059(object):
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48 # XXX: RSM management is done directly in Wokkel.
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49
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50 def __init__(self, host):
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51 log.info(_("Result Set Management plugin initialization"))
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52
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53 def getHandler(self, client):
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54 return XEP_0059_handler()
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55
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56 def parseExtra(self, extra):
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57 """Parse extra dictionnary to retrieve RSM arguments
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58
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59 @param extra(dict): data for parse
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60 @return (rsm.RSMRequest, None): request with parsed arguments
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61 or None if no RSM arguments have been found
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62 """
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63 if int(extra.get(RSM_PREFIX + 'max', 0)) < 0:
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64 raise ValueError(_("rsm_max can't be negative"))
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65
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66 rsm_args = {}
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67 for arg in ("max", "after", "before", "index"):
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68 try:
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69 argname = "max_" if arg == "max" else arg
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70 rsm_args[argname] = extra.pop(RSM_PREFIX + arg)
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71 except KeyError:
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72 continue
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73
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74 if rsm_args:
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75 return rsm.RSMRequest(**rsm_args)
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76 else:
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77 return None
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78
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79 def response2dict(self, rsm_response, data=None):
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80 """Return a dict with RSM response
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81
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82 Key set in data can be:
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83 - rsm_first: first item id in the page
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84 - rsm_last: last item id in the page
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85 - rsm_index: position of the first item in the full set (may be approximate)
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86 - rsm_count: total number of items in the full set (may be approximage)
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87 If a value doesn't exists, it's not set.
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88 All values are set as strings.
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89 @param rsm_response(rsm.RSMResponse): response to parse
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90 @param data(dict, None): dict to update with rsm_* data.
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91 If None, a new dict is created
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92 @return (dict): data dict
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93 """
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94 if data is None:
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95 data = {}
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96 if rsm_response.first is not None:
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97 data["first"] = rsm_response.first
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98 if rsm_response.last is not None:
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99 data["last"] = rsm_response.last
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100 if rsm_response.index is not None:
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101 data["index"] = rsm_response.index
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102 return data
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103
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104 def getNextRequest(
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105 self,
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106 rsm_request: rsm.RSMRequest,
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107 rsm_response: rsm.RSMResponse,
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108 log_progress: bool = True,
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109 ) -> Optional[rsm.RSMRequest]:
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110 """Generate next request to paginate through all items
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111
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112 Page will be retrieved forward
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113 @param rsm_request: last request used
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114 @param rsm_response: response from the last request
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115 @return: request to retrive next page, or None if we are at the end
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116 or if pagination is not possible
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117 """
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118 if rsm_request.max == 0:
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119 log.warning("Can't do pagination if max is 0")
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120 return None
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121 if rsm_response is None:
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122 # may happen if result set it empty, or we are at the end
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123 return None
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124 if (
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125 rsm_response.count is not None
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126 and rsm_response.index is not None
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127 ):
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128 next_index = rsm_response.index + rsm_request.max
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129 if next_index >= rsm_response.count:
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130 # we have reached the last page
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131 return None
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132
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133 if log_progress:
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134 log.debug(
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135 f"retrieving items {next_index} to "
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parents: 3479
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136 f"{min(next_index+rsm_request.max, rsm_response.count)} on "
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137 f"{rsm_response.count} ({next_index/rsm_response.count*100:.2f}%)"
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parents: 3479
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138 )
ef144aaea2bb plugin XEP-0059: new `getNextRequest` method to generate request to retrieve next page
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parents: 3479
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139
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parents: 3479
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140 if rsm_response.last is None:
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parents: 3479
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141 log.warning("Can't do pagination, no \"last\" received")
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142 return None
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parents: 3479
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143
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144 return rsm.RSMRequest(
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parents: 3479
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145 max_=rsm_request.max,
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parents: 3479
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146 after=rsm_response.last
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147 )
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148
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149
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ab2696e34d29 Python 3 port:
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parents: 2771
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150 @implementer(iwokkel.IDisco)
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151 class XEP_0059_handler(xmlstream.XMPPHandler):
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152
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153 def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
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154 return [disco.DiscoFeature(rsm.NS_RSM)]
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souliane <souliane@mailoo.org>
parents:
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155
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parents: 2562
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156 def getDiscoItems(self, requestor, target, nodeIdentifier=""):
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157 return []