Mercurial > prosody-modules

annotate mod_storage_gdbm/mod_storage_gdbm.lua @ 1631:98427ed3d53f

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mod_storage_gdbm: Update archive metadata only if data write succeeds
author Kim Alvefur <zash@zash.se>
date Wed, 25 Mar 2015 17:41:13 +0100
parents 0fcd63818aa1
children 050d101af207
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1 -- mod_storage_gdbm
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2 -- Copyright (C) 2014-2015 Kim Alvefur
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3 --
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4 -- This file is MIT/X11 licensed.
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5 --
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6 -- Depends on lgdbm:
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7 -- http://webserver2.tecgraf.puc-rio.br/~lhf/ftp/lua/#lgdbm
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8
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9 local gdbm = require"gdbm";
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10 local path = require"util.paths";
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11 local lfs = require"lfs";
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12 local st = require"util.stanza";
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13 local uuid = require"util.uuid".generate;
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14
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15 local serialization = require"util.serialization";
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16 local serialize = serialization.serialize;
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17 local deserialize = serialization.deserialize;
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18
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19 local g_set, g_get, g_del = gdbm.replace, gdbm.fetch, gdbm.delete;
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20 local g_first, g_next = gdbm.firstkey, gdbm.nextkey;
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21
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22 local t_remove = table.remove;
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23
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24 local empty = {};
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25
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26 local function id(v) return v; end
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27
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28 local function is_stanza(s)
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29 return getmetatable(s) == st.stanza_mt;
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30 end
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31
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32 local function t(c, a, b)
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33 if c then return a; end return b;
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34 end
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35
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36 local base_path = path.resolve_relative_path(prosody.paths.data, module.host);
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37 lfs.mkdir(base_path);
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38
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39 local cache = {};
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40
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41 local keyval = {};
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42 local keyval_mt = { __index = keyval, suffix = ".db" };
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43
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44 function keyval:set(user, value)
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45 if type(value) == "table" and next(value) == nil then
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46 value = nil;
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47 end
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48 if value ~= nil then
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49 value = serialize(value);
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50 end
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51 local ok, err = (value and g_set or g_del)(self._db, user or "@", value);
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52 if not ok then return nil, err; end
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53 return true;
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54 end
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55
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56 function keyval:get(user)
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57 local data, err = g_get(self._db, user or "@");
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58 if not data then return nil, err; end
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59 return deserialize(data);
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60 end
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61
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62 local archive = {};
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63 local archive_mt = { __index = archive, suffix = ".adb" };
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64
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65 archive.get = keyval.get;
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66 archive.set = keyval.set;
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67
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68 function archive:append(username, key, when, with, value)
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69 key = key or uuid();
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70 local meta = self:get(username);
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71 if not meta then
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72 meta = {};
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73 end
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74 local i = meta[key] or #meta+1;
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75 local type;
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76 if is_stanza(value) then
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77 type, value = "stanza", st.preserialize(value);
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78 end
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79 meta[i] = { key = key, when = when, with = with, type = type };
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80 meta[key] = i;
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81 local ok, err = self:set(key, value);
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82 if not ok then return nil, err; end
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83 ok, err = self:set(username, meta);
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84 if not ok then return nil, err; end
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85 return key;
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86 end
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87
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88 local deserialize = {
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89 stanza = st.deserialize;
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90 };
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91
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92 function archive:find(username, query)
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93 query = query or empty_query;
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94 local meta = self:get(username) or empty;
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95 local r = query.reverse;
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96 local d = t(r, -1, 1);
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97 local s = meta[t(r, query.before, query.after)];
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98 local limit = query.limit;
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99 if s then
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100 s = s + d;
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101 else
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102 s = t(r, #meta, 1)
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103 end
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104 local e = t(r, 1, #meta);
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105 local c = 0;
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106 return function ()
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107 if limit and c >= limit then return end
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108 local item, value;
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109 for i = s, e, d do
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110 item = meta[i];
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111 if (not query.with or item.with == query.with)
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112 and (not query.start or item.when >= query.start)
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113 and (not query["end"] or item.when <= query["end"]) then
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114 s = i + d; c = c + 1;
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115 value = self:get(item.key);
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116 return item.key, (deserialize[item.type] or id)(value), item.when, item.with;
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117 end
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118 end
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119 end
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120 end
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121
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122 local drivers = {
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123 keyval = keyval_mt;
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124 archive = archive_mt;
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125 }
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126
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127 function open(_, store, typ)
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128 typ = typ or "keyval";
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129 local driver_mt = drivers[typ];
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130 if not driver_mt then
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131 return nil, "unsupported-store";
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132 end
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133
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134 local db_path = path.join(base_path, store) .. driver_mt.suffix;
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135
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136 local db = cache[db_path];
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137 if not db then
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138 db = assert(gdbm.open(db_path, "c"));
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139 cache[db_path] = db;
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140 end
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141 return setmetatable({ _db = db; _path = db_path; store = store, typ = type }, driver_mt);
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142 end
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143
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144 function module.unload()
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145 for path, db in pairs(cache) do
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146 gdbm.sync(db);
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147 gdbm.close(db);
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148 end
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149 end
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150
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151 module:provides"storage";