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annotate mod_storage_memory/mod_storage_memory.lua @ 1608:59fdf4f12343

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mod_storage_memory: Add support for archive stores
author Kim Alvefur <zash@zash.se>
date Thu, 12 Feb 2015 21:17:06 +0100
parents 8b997d9cf09e
children 54c8a0cb2996
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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 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";
fa7e402fcdc1 mod_storage_memory: Simple in-memory only storage backend without persistence
Kim Alvefur <zash@zash.se>
parents:
diff changeset
142 end
fa7e402fcdc1 mod_storage_memory: Simple in-memory only storage backend without persistence
Kim Alvefur <zash@zash.se>
parents:
diff changeset
143
fa7e402fcdc1 mod_storage_memory: Simple in-memory only storage backend without persistence
Kim Alvefur <zash@zash.se>
parents:
diff changeset
144 module:provides("storage", driver);