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annotate mod_storage_memory/mod_storage_memory.lua @ 2097:4454f124465a

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mod_storage_memory: Support for empty username stores
author Matthew Wild <mwild1@gmail.com>
date Wed, 16 Mar 2016 12:55:25 +0000
parents e72f9eac51c8
children 85d88ed4f2a2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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fa7e402fcdc1 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);