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annotate mod_storage_memory/mod_storage_memory.lua @ 2656:83fb61fa476e

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mod_storage_memory: Serialize data functions that return the data (prevents mutation of stored data)
author Kim Alvefur <zash@zash.se>
date Thu, 30 Mar 2017 23:40:29 +0200
parents f4353f959460
children 6c22cb7b0e66
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83fb61fa476e mod_storage_memory: Serialize data functions that return the data (prevents mutation of stored data)
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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 self.store[username or NULL] = envload(serialize(data), "@data", {});
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33 return true;
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34 end
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35
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36 keyval_store.purge = _purge_store;
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37
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38 local archive_store = {};
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39 archive_store.__index = archive_store;
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40
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41 function archive_store:append(username, key, value, when, with)
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42 if type(when) ~= "number" then
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43 when, with, value = value, when, with;
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44 end
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45 if is_stanza(value) then
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46 value = st.preserialize(value);
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47 value = function ()
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48 return st.deserialize(envload(serialize(data), "@stanza", {}));
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49 end
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50 else
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51 value = envload(serialize(data), "@data", {});
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52 end
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53 local a = self.store[username or NULL];
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54 if not a then
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55 a = {};
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56 self.store[username or NULL] = a;
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57 end
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58 local i = #a+1;
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59 local v = { key = key, when = when, with = with, value = value };
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60 if not key or a[key] then
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61 key = tostring(a):match"%x+$"..tostring(v):match"%x+$";
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62 v.key = key;
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63 end
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64 a[i] = v;
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65 a[key] = i;
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66 return key;
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67 end
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68
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69 local function archive_iter (a, start, stop, step, limit, when_start, when_end, match_with)
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70 local item, when, with;
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71 local count = 0;
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72 coroutine.yield(true); -- Ready
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73 for i = start, stop, step do
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74 item = a[i];
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75 when, with = item.when, item.with;
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76 if when >= when_start and when_end >= when and (not match_with or match_with == with) then
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77 coroutine.yield(item.key, item.value(), when, with);
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78 count = count + 1;
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79 if limit and count >= limit then return end
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80 end
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81 end
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82 end
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83
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84 function archive_store:find(username, query)
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85 local a = self.store[username or NULL] or {};
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86 local start, stop, step = 1, #a, 1;
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87 local qstart, qend, qwith = -math.huge, math.huge;
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88 local limit;
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89 if query then
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90 module:log("debug", "query included")
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91 if query.reverse then
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92 start, stop, step = stop, start, -1;
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93 if query.before then
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94 start = a[query.before];
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95 end
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96 elseif query.after then
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97 start = a[query.after];
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98 end
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99 limit = query.limit;
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100 qstart = query.start or qstart;
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101 qend = query["end"] or qend;
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102 end
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103 if not start then return nil, "invalid-key"; end
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104 local iter = coroutine.wrap(archive_iter);
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105 iter(a, start, stop, step, limit, qstart, qend, qwith);
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106 return iter;
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107 end
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108
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109 function archive_store:delete(username, query)
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110 if not query or next(query) == nil then
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111 self.store[username or NULL] = nil;
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112 return true;
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113 end
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114 local old = self.store[username or NULL];
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115 if not old then return true; end
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116 local qstart = query.start or -math.huge;
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117 local qend = query["end"] or math.huge;
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118 local qwith = query.with;
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119 local new = {};
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120 self.store[username or NULL] = new;
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121 local t;
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122 for i = 1, #old do
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123 i = old[i];
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124 t = i.when;
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125 if not(qstart >= t and qend <= t and (not qwith or i.with == qwith)) then
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126 self:append(username, i.key, i.value, t, i.with);
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127 end
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128 end
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129 if #new == 0 then
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130 self.store[username or NULL] = nil;
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131 end
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132 return true;
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133 end
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134
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135 archive_store.purge = _purge_store;
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136
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137 local stores = {
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138 keyval = keyval_store;
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139 archive = archive_store;
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140 }
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141
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142 local driver = {};
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143
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144 function driver:open(store, typ)
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145 local store_mt = stores[typ or "keyval"];
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146 if store_mt then
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147 return setmetatable({ store = memory[store] }, store_mt);
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148 end
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149 return nil, "unsupported-store";
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150 end
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151
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152 if auto_purge_enabled then
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153 module:hook("resource-unbind", function (event)
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154 local user_bare_jid = event.session.username.."@"..event.session.host;
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155 if not prosody.bare_sessions[user_bare_jid] then -- User went offline
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156 module:log("debug", "Clearing store for offline user %s", user_bare_jid);
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157 local f, s, v;
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158 if auto_purge_stores:empty() then
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159 f, s, v = pairs(memory);
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160 else
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161 f, s, v = auto_purge_stores:items();
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162 end
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163
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164 for store_name in f, s, v do
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165 if memory[store_name] then
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166 memory[store_name][event.session.username] = nil;
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167 end
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168 end
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169 end
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170 end);
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171 end
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172
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173 module:provides("storage", driver);