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annotate mod_storage_memory/mod_storage_memory.lua @ 4842:8d4b91a703af

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mod_pubsub_post: Document JSON to XML mapping capability
author Kim Alvefur <zash@zash.se>
date Wed, 29 Dec 2021 23:12:43 +0100
parents bc745a60ce21
children
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1 local serialize = require "util.serialization".serialize;
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2 local envload = require "util.envload".envload;
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3 local st = require "util.stanza";
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4 local is_stanza = st.is_stanza or function (s) return getmetatable(s) == st.stanza_mt end
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5
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6 local auto_purge_enabled = module:get_option_boolean("storage_memory_temporary", false);
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7 local auto_purge_stores = module:get_option_set("storage_memory_temporary_stores", {});
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8
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9 local memory = setmetatable({}, {
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10 __index = function(t, k)
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11 local store = module:shared(k)
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12 t[k] = store;
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13 return store;
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14 end
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15 });
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16
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17 local function NULL() return nil end
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18
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19 local function _purge_store(self, username)
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20 self.store[username or NULL] = nil;
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21 return true;
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22 end
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23
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24 local keyval_store = {};
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25 keyval_store.__index = keyval_store;
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26
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27 function keyval_store:get(username)
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28 return (self.store[username or NULL] or NULL)();
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29 end
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30
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31 function keyval_store:set(username, data)
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32 if data ~= nil then
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33 data = envload("return "..serialize(data), "@data", {});
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34 end
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35 self.store[username or NULL] = data;
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36 return true;
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37 end
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38
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39 keyval_store.purge = _purge_store;
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40
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41 local archive_store = {};
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42 archive_store.__index = archive_store;
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43
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44 function archive_store:append(username, key, value, when, with)
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45 if type(when) ~= "number" then
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46 when, with, value = value, when, with;
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47 end
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48 if is_stanza(value) then
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49 value = st.preserialize(value);
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50 value = envload("return xml"..serialize(value), "@stanza", { xml = st.deserialize })
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51 else
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52 value = envload("return "..serialize(value), "@data", {});
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53 end
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54 local a = self.store[username or NULL];
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55 if not a then
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56 a = {};
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57 self.store[username or NULL] = a;
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58 end
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59 local i = #a+1;
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60 local v = { key = key, when = when, with = with, value = value };
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61 if not key then
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62 key = tostring(a):match"%x+$"..tostring(v):match"%x+$";
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63 v.key = key;
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64 end
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65 if a[key] then
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66 table.remove(a, a[key]);
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67 end
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68 a[i] = v;
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69 a[key] = i;
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70 return key;
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71 end
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72
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73 local function archive_iter (a, start, stop, step, limit, when_start, when_end, match_with)
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74 local item, when, with;
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75 local count = 0;
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76 coroutine.yield(true); -- Ready
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77 for i = start, stop, step do
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78 item = a[i];
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79 when, with = item.when, item.with;
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80 if when >= when_start and when_end >= when and (not match_with or match_with == with) then
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81 coroutine.yield(item.key, item.value(), when, with);
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82 count = count + 1;
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83 if limit and count >= limit then return end
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84 end
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85 end
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86 end
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87
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88 function archive_store:find(username, query)
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89 local a = self.store[username or NULL] or {};
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90 local start, stop, step = 1, #a, 1;
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91 local qstart, qend, qwith = -math.huge, math.huge;
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92 local limit;
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93 if query then
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94 module:log("debug", "query included")
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95 if query.reverse then
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96 start, stop, step = stop, start, -1;
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97 if query.before then
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98 start = a[query.before];
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99 end
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100 elseif query.after then
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101 start = a[query.after];
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102 end
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103 limit = query.limit;
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104 qstart = query.start or qstart;
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105 qend = query["end"] or qend;
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106 qwith = query.with;
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107 end
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108 if not start then return nil, "invalid-key"; end
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109 local iter = coroutine.wrap(archive_iter);
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110 iter(a, start, stop, step, limit, qstart, qend, qwith);
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111 return iter;
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112 end
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113
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114 function archive_store:delete(username, query)
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115 if not query or next(query) == nil then
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116 self.store[username or NULL] = nil;
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117 return true;
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118 end
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119 local old = self.store[username or NULL];
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120 if not old then return true; end
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121 local qstart = query.start or -math.huge;
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122 local qend = query["end"] or math.huge;
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123 local qwith = query.with;
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124 local new = {};
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125 self.store[username or NULL] = new;
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126 local t;
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127 for i = 1, #old do
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128 i = old[i];
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129 t = i.when;
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130 if not(qstart >= t and qend <= t and (not qwith or i.with == qwith)) then
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131 self:append(username, i.key, i.value(), t, i.with);
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132 end
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133 end
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134 if #new == 0 then
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135 self.store[username or NULL] = nil;
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136 end
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137 return true;
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138 end
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139
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140 archive_store.purge = _purge_store;
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141
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142 local stores = {
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143 keyval = keyval_store;
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144 archive = archive_store;
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145 }
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146
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147 local driver = {};
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148
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149 function driver:open(store, typ) -- luacheck: ignore 212/self
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150 local store_mt = stores[typ or "keyval"];
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151 if store_mt then
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152 return setmetatable({ store = memory[store] }, store_mt);
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153 end
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154 return nil, "unsupported-store";
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155 end
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156
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157 if auto_purge_enabled then
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158 module:hook("resource-unbind", function (event)
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159 local user_bare_jid = event.session.username.."@"..event.session.host;
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160 if not prosody.bare_sessions[user_bare_jid] then -- User went offline
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161 module:log("debug", "Clearing store for offline user %s", user_bare_jid);
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diff changeset
162 local f, s, v;
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163 if auto_purge_stores:empty() then
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164 f, s, v = pairs(memory);
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165 else
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166 f, s, v = auto_purge_stores:items();
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167 end
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parents: 2619
diff changeset
168
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169 for store_name in f, s, v do
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170 if memory[store_name] then
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parents: 2619
diff changeset
171 memory[store_name][event.session.username] = nil;
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172 end
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parents: 2619
diff changeset
173 end
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parents: 2619
diff changeset
174 end
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Matthew Wild <mwild1@gmail.com>
parents: 2619
diff changeset
175 end);
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parents: 2619
diff changeset
176 end
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parents: 2619
diff changeset
177
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parents:
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178 module:provides("storage", driver);