Mercurial > prosody-modules

annotate mod_storage_gdbm/mod_storage_gdbm.lua @ 1628:5e4b37b9cde1

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mod_storage_gdbm: Fix traceback if query is nil or no metadata exists
author Kim Alvefur <zash@zash.se>
date Wed, 25 Mar 2015 17:29:54 +0100
parents 53052a610c67
children 36eb0dbea7ba
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 -- mod_storage_gdbm
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2 -- Copyright (C) 2014 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 uuid = require"util.uuid".generate;
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13 local serialization = require"util.serialization";
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14 local st = require"util.stanza";
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15 local serialize = serialization.serialize;
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16 local deserialize = serialization.deserialize;
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17
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18 local empty = {};
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19
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20 local function id(v) return v; end
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21
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22 local function is_stanza(s)
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23 return getmetatable(s) == st.stanza_mt;
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24 end
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25
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26 local function ifelse(cond, iftrue, iffalse)
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27 if cond then return iftrue; end return iffalse;
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28 end
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29
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30 local base_path = path.resolve_relative_path(prosody.paths.data, module.host);
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31 lfs.mkdir(base_path);
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32
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33 local cache = {};
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34
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35 local keyval = {};
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36 local keyval_mt = { __index = keyval, suffix = ".db" };
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37
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38 function keyval:set(user, value)
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39 local ok, err = gdbm.replace(self._db, user or "@", serialize(value));
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40 if not ok then return nil, err; end
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41 return true;
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42 end
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43
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44 function keyval:get(user)
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45 local data, err = gdbm.fetch(self._db, user or "@");
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46 if not data then return nil, err; end
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47 return deserialize(data);
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48 end
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49
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50 local archive = {};
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51 local archive_mt = { __index = archive, suffix = ".adb" };
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52
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53 archive.get = keyval.get;
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54 archive.set = keyval.set;
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55
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56 function archive:append(username, key, when, with, value)
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57 key = key or uuid();
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58 local meta = self:get(username);
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59 if not meta then
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60 meta = {};
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61 end
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62 local i = meta[key] or #meta+1;
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63 local type;
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64 if is_stanza(value) then
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65 type, value = "stanza", st.preserialize(value);
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66 end
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67 meta[i] = { key = key, when = when, with = with, type = type };
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68 meta[key] = i;
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69 local ok, err = self:set(username, meta);
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70 if not ok then return nil, err; end
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71 ok, err = self:set(key, value);
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72 if not ok then return nil, err; end
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73 return key;
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74 end
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75
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76 local deserialize = {
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77 stanza = st.deserialize;
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78 };
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79
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80 function archive:find(username, query)
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81 query = query or empty_query;
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82 local meta = self:get(username) or empty;
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83 local r = query.reverse;
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84 local d = r and -1 or 1;
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85 local s = meta[ifelse(r, query.before, query.after)];
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86 local limit = query.limit;
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87 if s then
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88 s = s + d;
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89 else
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90 s = ifelse(r, #meta, 1)
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91 end
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92 local e = ifelse(r, 1, #meta);
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93 local c = 0;
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94 return function ()
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95 if limit and c >= limit then return end
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96 local item, value;
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97 for i = s, e, d do
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98 item = meta[i];
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99 if (not query.with or item.with == query.with)
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100 and (not query.start or item.when >= query.start)
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101 and (not query["end"] or item.when <= query["end"]) then
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102 s = i + d; c = c + 1;
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103 value = self:get(item.key);
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104 return item.key, (deserialize[item.type] or id)(value), item.when, item.with;
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105 end
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106 end
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107 end
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108 end
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109
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110 local drivers = {
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111 keyval = keyval_mt;
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112 archive = archive_mt;
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113 }
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114
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115 function open(_, store, typ)
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116 typ = typ or "keyval";
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117 local driver_mt = drivers[typ];
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118 if not driver_mt then
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119 return nil, "unsupported-store";
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120 end
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121
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122 local db_path = path.join(base_path, store) .. driver_mt.suffix;
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123
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124 local db = cache[db_path];
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125 if not db then
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126 db = assert(gdbm.open(db_path, "c"));
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127 cache[db_path] = db;
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128 end
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129 return setmetatable({ _db = db; _path = db_path; store = store, typ = type }, driver_mt);
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130 end
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131
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132 function module.unload()
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133 for path, db in pairs(cache) do
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
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134 gdbm.sync(db);
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
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135 gdbm.close(db);
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
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136 end
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
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137 end
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
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138
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
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139 module:provides"storage";