Mercurial > prosody-modules

annotate mod_storage_gdbm/mod_storage_gdbm.lua @ 4877:adc6241e5d16

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mod_measure_process: Report the enforced limit The soft limit is what the kernel actually enforces, while the hard limit is is how far you can change the soft limit without privileges. Unless the process dynamically adjusts the soft limit, knowing the hard limit is not as useful as knowing the soft limit. Reporting the soft limit and the number of in-use FDs allows placing alerts on expressions like 'process_open_fds / process_max_fds >= 0.95'
author Kim Alvefur <zash@zash.se>
date Tue, 18 Jan 2022 18:55:20 +0100
parents 95ad6e68e203
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 base_path = path.resolve_relative_path(prosody.paths.data, module.host);
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33 lfs.mkdir(base_path);
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34
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35 local cache = {};
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36
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37 local keyval = {};
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38 local keyval_mt = { __index = keyval, suffix = ".db" };
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39
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40 function keyval:set(user, value)
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41 if type(value) == "table" and next(value) == nil then
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42 value = nil;
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43 end
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44 if value ~= nil then
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45 value = serialize(value);
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46 end
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47 local ok, err = (value and g_set or g_del)(self._db, user or "@", value);
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48 if not ok then return nil, err; end
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49 return true;
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50 end
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51
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52 function keyval:get(user)
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53 local data, err = g_get(self._db, user or "@");
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54 if not data then return nil, err; end
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55 return deserialize(data);
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56 end
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57
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58 local function g_keys(db, key)
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59 return (key == nil and g_first or g_next)(db, key);
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60 end
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61
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62 function keyval:users()
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63 return g_keys, self._db, nil;
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64 end
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65
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66 local archive = {};
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67 local archive_mt = { __index = archive, suffix = ".adb" };
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68
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69 archive.get = keyval.get;
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70 archive.set = keyval.set;
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71
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72 function archive:append(username, key, value, when, with)
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73 if type(when) ~= "number" then
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74 when, with, value = value, when, with;
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75 end
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76
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77 key = key or uuid();
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78 local meta = self:get(username);
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79 if not meta then
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80 meta = {};
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81 end
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82 local i = meta[key] or #meta+1;
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83 local type;
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84 if is_stanza(value) then
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85 type, value = "stanza", st.preserialize(value);
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86 end
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87 meta[i] = { key = key, when = when, with = with, type = type };
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88 meta[key] = i;
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89 local prefix = (username or "@") .. "#";
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90 local ok, err = self:set(prefix..key, value);
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91 if not ok then return nil, err; end
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92 ok, err = self:set(username, meta);
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93 if not ok then return nil, err; end
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94 return key;
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95 end
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96
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97 local deserialize_map = {
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98 stanza = st.deserialize;
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99 };
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100
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101 function archive:find(username, query)
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102 query = query or empty;
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103 local meta = self:get(username) or empty;
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104 local prefix = (username or "@") .. "#";
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105 local reverse = query.reverse;
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106 local step = reverse and -1 or 1;
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107 local first = meta[query.after];
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108 local last = meta[query.before];
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109 -- we don't want to include the actual 'after' or 'before' item
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110 if first then first = first + 1; end
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111 if last then last = last - 1; end
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112 first, last = first or 1, last or #meta;
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113 if reverse then first, last = last, first; end
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114 local limit = query.limit;
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115 local count = 0;
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116 return function ()
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117 if limit and count >= limit then return end
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118 local item, value;
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119 for i = first, last, step do
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120 item = meta[i];
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121 if (not query.with or item.with == query.with)
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122 and (not query.start or item.when >= query.start)
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123 and (not query["end"] or item.when <= query["end"]) then
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124 first = i + step; count = count + 1;
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050d101af207 mod_storage_gdbm: Prefix archive item keys with username to prevent collisions
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parents: 1631
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125 value = self:get(prefix..item.key);
1653
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parents: 1635
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126 return item.key, (deserialize_map[item.type] or id)(value), item.when, item.with;
1596
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127 end
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128 end
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129 end
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130 end
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131
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132 local drivers = {
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133 keyval = keyval_mt;
1596
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parents: 1595
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134 archive = archive_mt;
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6288591d5edf mod_storage_gdbm: Prepare for supporting multiple store types
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parents: 1593
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135 }
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parents: 1593
diff changeset
136
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parents:
diff changeset
137 function open(_, store, typ)
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parents:
diff changeset
138 typ = typ or "keyval";
1595
6288591d5edf mod_storage_gdbm: Prepare for supporting multiple store types
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parents: 1593
diff changeset
139 local driver_mt = drivers[typ];
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Kim Alvefur <zash@zash.se>
parents: 1593
diff changeset
140 if not driver_mt then
1570
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
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parents:
diff changeset
141 return nil, "unsupported-store";
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Kim Alvefur <zash@zash.se>
parents:
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142 end
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parents:
diff changeset
143
1595
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parents: 1593
diff changeset
144 local db_path = path.join(base_path, store) .. driver_mt.suffix;
1570
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
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145
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
146 local db = cache[db_path];
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
147 if not db then
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
148 db = assert(gdbm.open(db_path, "c"));
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
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parents:
diff changeset
149 cache[db_path] = db;
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
150 end
1754
c04d10557bbc mod_storage_gdbm: Fix typo in unused field on store instance
Kim Alvefur <zash@zash.se>
parents: 1753
diff changeset
151 return setmetatable({ _db = db; _path = db_path; store = store, type = typ }, driver_mt);
1570
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
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parents:
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152 end
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
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parents:
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153
1634
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
154 function purge(_, user)
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Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
155 for dir in lfs.dir(base_path) do
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
156 local name, ext = dir:match("^(.-)%.a?db$");
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
157 if ext == ".db" then
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
158 open(_, name, "keyval"):set(user, nil);
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
159 elseif ext == ".adb" then
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
160 open(_, name, "archive"):delete(user);
25441bd8b344 mod_storage_gdbm: Add purge action
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parents: 1633
diff changeset
161 end
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
162 end
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
163 return true;
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
164 end
25441bd8b344 mod_storage_gdbm: Add purge action
Kim Alvefur <zash@zash.se>
parents: 1633
diff changeset
165
1570
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
166 function module.unload()
1653
1fe899527ee5 mod_storage_gdbm: Cleanup [luacheck]
Kim Alvefur <zash@zash.se>
parents: 1635
diff changeset
167 for db_path, db in pairs(cache) do
1fe899527ee5 mod_storage_gdbm: Cleanup [luacheck]
Kim Alvefur <zash@zash.se>
parents: 1635
diff changeset
168 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
169 gdbm.reorganize(db);
1570
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
170 gdbm.sync(db);
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
171 gdbm.close(db);
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
172 end
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
173 end
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
174
67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
parents:
diff changeset
175 module:provides"storage";