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mod_storage_memory/mod_storage_memory.lua @ 1631:98427ed3d53f
mod_storage_gdbm: Update archive metadata only if data write succeeds
author | Kim Alvefur <zash@zash.se> |
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date | Wed, 25 Mar 2015 17:41:13 +0100 |
parent | 1608:59fdf4f12343 |
child | 1753:54c8a0cb2996 |
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 keyval_store = {}; |
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11 keyval_store.__index = keyval_store; |
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12 |
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13 function keyval_store:get(username) |
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14 return self.store[username]; |
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15 end |
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16 |
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17 function keyval_store:set(username, data) |
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18 self.store[username] = data; |
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19 return true; |
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20 end |
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21 |
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22 local map_store = {}; |
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23 map_store.__index = map_store; |
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24 |
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25 function map_store:get(username, key) |
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26 local userstore = self.store[username]; |
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27 if type(userstore) == "table" then |
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28 return userstore[key]; |
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29 end |
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30 end |
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31 |
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32 function map_store:set(username, key, data) |
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33 local userstore = self.store[username]; |
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34 if userstore == nil then |
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35 userstore = {}; |
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36 self.store[username] = userstore; |
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37 end |
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38 userstore[key] = data; |
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39 return true; |
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40 end |
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41 |
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42 local archive_store = {}; |
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43 archive_store.__index = archive_store; |
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44 |
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45 function archive_store:append(username, key, when, with, value) |
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46 local a = self.store[username]; |
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47 if not a then |
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48 a = {}; |
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49 self.store[username] = a; |
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50 end |
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51 local i = #a+1; |
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52 local v = { key = key, when = when, with = with, value = value }; |
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53 if not key or a[key] then |
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54 key = tostring(a):match"%x+$"..tostring(v):match"%x+$"; |
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55 v.key = key; |
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56 end |
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57 a[i] = v; |
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58 a[key] = i; |
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59 return true; |
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60 end |
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61 |
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62 local function archive_iter (a, start, stop, step, limit, when_start, when_end, match_with) |
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63 local item, when, with; |
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64 local count = 0; |
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65 coroutine.yield(true); -- Ready |
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66 for i = start, stop, step do |
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67 item = a[i]; |
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68 when, with = item.when, item.with; |
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69 if when >= when_start and when_end >= when and (not match_with or match_with == with) then |
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70 coroutine.yield(item.key, item.value, when, with); |
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71 count = count + 1; |
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72 if limit and count >= limit then return end |
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73 end |
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74 end |
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75 end |
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76 |
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77 function archive_store:find(username, query) |
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78 local a = self.store[username] or {}; |
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79 local start, stop, step = 1, #a, 1; |
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80 local qstart, qend, qwith = -math.huge, math.huge; |
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81 local limit; |
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82 if query then |
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83 module:log("debug", "query included") |
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84 if query.reverse then |
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85 start, stop, step = stop, start, -1; |
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86 if query.before then |
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87 start = a[query.before]; |
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88 end |
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89 elseif query.after then |
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90 start = a[query.after]; |
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91 end |
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92 limit = query.limit; |
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93 qstart = query.start or qstart; |
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94 qend = query["end"] or qend; |
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95 end |
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96 if not start then return nil, "invalid-key"; end |
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97 local iter = coroutine.wrap(archive_iter); |
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98 iter(a, start, stop, step, limit, qstart, qend, qwith); |
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99 return iter; |
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100 end |
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101 |
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102 function archive_store:delete(username, query) |
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103 if not query or next(query) == nil then |
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104 self.store[username] = nil; |
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105 return true; |
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106 end |
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107 local old = self.store[username]; |
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108 if not old then return true; end |
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109 local qstart = query.start or -math.huge; |
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110 local qend = query["end"] or math.huge; |
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111 local qwith = query.with; |
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112 local new = {}; |
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113 self.store[username] = new; |
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114 local t; |
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115 for i = 1, #old do |
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116 i = old[i]; |
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117 t = i.when; |
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118 if not(qstart >= t and qend <= t and (not qwith or i.with == qwith)) then |
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119 self:append(username, i.key, t, i.with, i.value); |
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120 end |
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121 end |
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122 if #new == 0 then |
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123 self.store[username] = nil; |
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124 end |
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125 return true; |
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126 end |
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127 |
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128 local stores = { |
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129 keyval = keyval_store; |
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130 map = map_store; |
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131 archive = archive_store; |
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132 } |
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133 |
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134 local driver = {}; |
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135 |
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136 function driver:open(store, typ) |
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137 local store_mt = stores[typ or "keyval"]; |
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138 if store_mt then |
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139 return setmetatable({ store = memory[store] }, store_mt); |
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140 end |
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141 return nil, "unsupported-store"; |
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142 end |
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143 |
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144 module:provides("storage", driver); |