prosody
368b092bf4bf
plugins/mod_storage_memory.lua

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plugins/mod_storage_memory.lua @ 9340:368b092bf4bf

mod_storage_memory: Fix saving of remaining items during deletion All data is compiled into functions that return new copies in order to prevent mutation of stored data. This has downsides. Also an ugly hack.
author Kim Alvefur <zash@zash.se>
date Sat, 22 Sep 2018 16:03:50 +0200
parent 9293:0a751835627d
child 9468:bd5e4485a245
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
9293
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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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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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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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171 memory[store_name][event.session.username] = nil;
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172 end
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173 end
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174 end
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175 end);
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176 end
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177
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178 module:provides("storage", driver);