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annotate mod_storage_gdbm/mod_storage_gdbm.lua @ 1886:e502c05c0608

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mod_storage_multi: Add README
author Kim Alvefur <zash@zash.se>
date Thu, 01 Oct 2015 17:27:23 +0200
parents e72f9eac51c8
children 95ad6e68e203
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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 -- luacheck: globals open purge
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11 local gdbm = require"gdbm";
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12 local path = require"util.paths";
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13 local lfs = require"lfs";
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14 local st = require"util.stanza";
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15 local uuid = require"util.uuid".generate;
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16
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17 local serialization = require"util.serialization";
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18 local serialize = serialization.serialize;
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19 local deserialize = serialization.deserialize;
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20
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21 local g_set, g_get, g_del = gdbm.replace, gdbm.fetch, gdbm.delete;
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22 local g_first, g_next = gdbm.firstkey, gdbm.nextkey;
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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 function g_keys(db, key)
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63 return (key == nil and g_first or g_next)(db, key);
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64 end
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65
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66 function keyval:users()
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67 return g_keys, self._db, nil;
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68 end
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69
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70 local archive = {};
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71 local archive_mt = { __index = archive, suffix = ".adb" };
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72
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73 archive.get = keyval.get;
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74 archive.set = keyval.set;
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75
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76 function archive:append(username, key, value, when, with)
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77 if type(when) ~= "number" then
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78 when, with, value = value, when, with;
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79 end
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80
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81 key = key or uuid();
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82 local meta = self:get(username);
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83 if not meta then
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84 meta = {};
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85 end
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86 local i = meta[key] or #meta+1;
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87 local type;
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88 if is_stanza(value) then
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89 type, value = "stanza", st.preserialize(value);
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90 end
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91 meta[i] = { key = key, when = when, with = with, type = type };
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92 meta[key] = i;
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93 local prefix = (username or "@") .. "#";
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94 local ok, err = self:set(prefix..key, value);
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95 if not ok then return nil, err; end
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96 ok, err = self:set(username, meta);
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97 if not ok then return nil, err; end
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98 return key;
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99 end
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100
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101 local deserialize_map = {
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102 stanza = st.deserialize;
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103 };
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104
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105 function archive:find(username, query)
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106 query = query or empty;
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107 local meta = self:get(username) or empty;
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108 local prefix = (username or "@") .. "#";
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109 local r = query.reverse;
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110 local d = t(r, -1, 1);
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111 local s = meta[t(r, query.before, query.after)];
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112 local limit = query.limit;
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113 if s then
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114 s = s + d;
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115 else
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116 s = t(r, #meta, 1)
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117 end
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118 local e = t(r, 1, #meta);
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119 local c = 0;
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120 return function ()
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121 if limit and c >= limit then return end
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122 local item, value;
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123 for i = s, e, d do
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124 item = meta[i];
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125 if (not query.with or item.with == query.with)
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126 and (not query.start or item.when >= query.start)
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127 and (not query["end"] or item.when <= query["end"]) then
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128 s = i + d; c = c + 1;
1632
050d101af207 mod_storage_gdbm: Prefix archive item keys with username to prevent collisions
Kim Alvefur <zash@zash.se>
parents: 1631
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129 value = self:get(prefix..item.key);
1653
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parents: 1635
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130 return item.key, (deserialize_map[item.type] or id)(value), item.when, item.with;
1596
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131 end
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132 end
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133 end
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134 end
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diff changeset
135
1595
6288591d5edf mod_storage_gdbm: Prepare for supporting multiple store types
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parents: 1593
diff changeset
136 local drivers = {
6288591d5edf mod_storage_gdbm: Prepare for supporting multiple store types
Kim Alvefur <zash@zash.se>
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137 keyval = keyval_mt;
1596
b362e6c00fd1 mod_storage_gdbm: Add archive support
Kim Alvefur <zash@zash.se>
parents: 1595
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138 archive = archive_mt;
1595
6288591d5edf mod_storage_gdbm: Prepare for supporting multiple store types
Kim Alvefur <zash@zash.se>
parents: 1593
diff changeset
139 }
6288591d5edf mod_storage_gdbm: Prepare for supporting multiple store types
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parents: 1593
diff changeset
140
1570
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
141 function open(_, store, typ)
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
142 typ = typ or "keyval";
1595
6288591d5edf mod_storage_gdbm: Prepare for supporting multiple store types
Kim Alvefur <zash@zash.se>
parents: 1593
diff changeset
143 local driver_mt = drivers[typ];
6288591d5edf mod_storage_gdbm: Prepare for supporting multiple store types
Kim Alvefur <zash@zash.se>
parents: 1593
diff changeset
144 if not driver_mt then
1570
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
145 return nil, "unsupported-store";
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
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146 end
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
147
1595
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Kim Alvefur <zash@zash.se>
parents: 1593
diff changeset
148 local db_path = path.join(base_path, store) .. driver_mt.suffix;
1570
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Kim Alvefur <zash@zash.se>
parents:
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149
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
150 local db = cache[db_path];
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
151 if not db then
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
152 db = assert(gdbm.open(db_path, "c"));
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
153 cache[db_path] = db;
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
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154 end
1754
c04d10557bbc mod_storage_gdbm: Fix typo in unused field on store instance
Kim Alvefur <zash@zash.se>
parents: 1753
diff changeset
155 return setmetatable({ _db = db; _path = db_path; store = store, type = typ }, driver_mt);
1570
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
156 end
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
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parents:
diff changeset
157
1634
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
158 function purge(_, user)
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
159 for dir in lfs.dir(base_path) do
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
160 local name, ext = dir:match("^(.-)%.a?db$");
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
161 if ext == ".db" then
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
162 open(_, name, "keyval"):set(user, nil);
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
163 elseif ext == ".adb" then
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
164 open(_, name, "archive"):delete(user);
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
165 end
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
166 end
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
167 return true;
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
168 end
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
169
1570
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
170 function module.unload()
1653
1fe899527ee5 mod_storage_gdbm: Cleanup [luacheck]
Kim Alvefur <zash@zash.se>
parents: 1635
diff changeset
171 for db_path, db in pairs(cache) do
1fe899527ee5 mod_storage_gdbm: Cleanup [luacheck]
Kim Alvefur <zash@zash.se>
parents: 1635
diff changeset
172 module:log("debug", "Closing db at %q", db_path);
1756
c619425dafe7 mod_storage_gdbm: Reorganize (vacuum) databases on module unload
Kim Alvefur <zash@zash.se>
parents: 1754
diff changeset
173 gdbm.reorganize(db);
1570
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
174 gdbm.sync(db);
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
175 gdbm.close(db);
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
176 end
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
177 end
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
178
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
179 module:provides"storage";