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mod_storage_memory/mod_storage_memory.lua @ 2113:d75145297bf9
mod_firewall: Support for defining extra chains in the config file
author | Matthew Wild <mwild1@gmail.com> |
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date | Thu, 17 Mar 2016 12:09:20 +0000 |
parent | 2097:4454f124465a |
child | 2171:85d88ed4f2a2 |
rev | line source |
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mod_storage_memory: Simple in-memory only storage backend without persistence
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1 |
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2 local memory = setmetatable({}, { |
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3 __index = function(t, k) |
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4 local store = module:shared(k) |
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5 t[k] = store; |
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6 return store; |
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7 end |
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8 }); |
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9 |
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10 local NULL = {}; |
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11 |
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12 local keyval_store = {}; |
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13 keyval_store.__index = keyval_store; |
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14 |
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15 function keyval_store:get(username) |
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16 return self.store[username or NULL]; |
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17 end |
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18 |
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19 function keyval_store:set(username, data) |
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20 self.store[username or NULL] = data; |
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21 return true; |
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22 end |
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23 |
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24 local map_store = {}; |
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25 map_store.__index = map_store; |
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26 |
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27 function map_store:get(username, key) |
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28 local userstore = self.store[username or NULL]; |
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29 if type(userstore) == "table" then |
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30 return userstore[key]; |
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31 end |
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32 end |
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33 |
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34 function map_store:set(username, key, data) |
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35 local userstore = self.store[username or NULL]; |
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36 if userstore == nil then |
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37 userstore = {}; |
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38 self.store[username or NULL] = userstore; |
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39 end |
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40 userstore[key] = data; |
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41 return true; |
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42 end |
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43 |
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44 local archive_store = {}; |
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45 archive_store.__index = archive_store; |
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46 |
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47 function archive_store:append(username, key, value, when, with) |
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48 if type(when) ~= "number" then |
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49 when, with, value = value, when, with; |
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50 end |
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51 local a = self.store[username or NULL]; |
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52 if not a then |
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53 a = {}; |
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54 self.store[username or NULL] = a; |
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55 end |
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56 local i = #a+1; |
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57 local v = { key = key, when = when, with = with, value = value }; |
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58 if not key or a[key] then |
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59 key = tostring(a):match"%x+$"..tostring(v):match"%x+$"; |
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60 v.key = key; |
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61 end |
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62 a[i] = v; |
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63 a[key] = i; |
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64 return true; |
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65 end |
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66 |
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67 local function archive_iter (a, start, stop, step, limit, when_start, when_end, match_with) |
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68 local item, when, with; |
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69 local count = 0; |
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70 coroutine.yield(true); -- Ready |
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71 for i = start, stop, step do |
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72 item = a[i]; |
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73 when, with = item.when, item.with; |
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74 if when >= when_start and when_end >= when and (not match_with or match_with == with) then |
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75 coroutine.yield(item.key, item.value, when, with); |
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76 count = count + 1; |
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77 if limit and count >= limit then return end |
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78 end |
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79 end |
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80 end |
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81 |
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82 function archive_store:find(username, query) |
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83 local a = self.store[username or NULL] or {}; |
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84 local start, stop, step = 1, #a, 1; |
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85 local qstart, qend, qwith = -math.huge, math.huge; |
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86 local limit; |
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87 if query then |
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88 module:log("debug", "query included") |
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89 if query.reverse then |
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90 start, stop, step = stop, start, -1; |
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91 if query.before then |
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92 start = a[query.before]; |
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93 end |
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94 elseif query.after then |
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95 start = a[query.after]; |
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96 end |
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97 limit = query.limit; |
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98 qstart = query.start or qstart; |
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99 qend = query["end"] or qend; |
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100 end |
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101 if not start then return nil, "invalid-key"; end |
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102 local iter = coroutine.wrap(archive_iter); |
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103 iter(a, start, stop, step, limit, qstart, qend, qwith); |
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104 return iter; |
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105 end |
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106 |
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107 function archive_store:delete(username, query) |
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108 if not query or next(query) == nil then |
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109 self.store[username or NULL] = nil; |
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110 return true; |
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111 end |
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112 local old = self.store[username or NULL]; |
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113 if not old then return true; end |
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114 local qstart = query.start or -math.huge; |
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115 local qend = query["end"] or math.huge; |
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116 local qwith = query.with; |
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117 local new = {}; |
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118 self.store[username or NULL] = new; |
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119 local t; |
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120 for i = 1, #old do |
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121 i = old[i]; |
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122 t = i.when; |
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123 if not(qstart >= t and qend <= t and (not qwith or i.with == qwith)) then |
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124 self:append(username, i.key, i.value, t, i.with); |
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125 end |
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126 end |
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127 if #new == 0 then |
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128 self.store[username or NULL] = nil; |
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129 end |
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130 return true; |
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131 end |
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132 |
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133 local stores = { |
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134 keyval = keyval_store; |
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135 map = map_store; |
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136 archive = archive_store; |
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137 } |
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138 |
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139 local driver = {}; |
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140 |
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141 function driver:open(store, typ) |
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142 local store_mt = stores[typ or "keyval"]; |
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143 if store_mt then |
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144 return setmetatable({ store = memory[store] }, store_mt); |
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145 end |
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146 return nil, "unsupported-store"; |
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147 end |
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148 |
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149 module:provides("storage", driver); |