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mod_storage_lmdb/mod_storage_lmdb.lua @ 1982:bb0b2eae5563
mod_storage_lmdb: Be consistent with argument name
author | Kim Alvefur <zash@zash.se> |
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date | Sat, 19 Dec 2015 00:25:30 +0100 |
parent | 1981:1f815f57fa57 |
child | 1983:f7fc5088b340 |
rev | line source |
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1 -- mod_storage_lmdb |
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2 -- Copyright (C) 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 lightningdbm |
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7 -- https://github.com/shmul/lightningdbm |
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8 -- |
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9 -- luacheck: globals prosody open |
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10 |
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11 local assert = assert; |
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12 local select = select; |
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13 local xpcall = xpcall; |
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14 local traceback = debug.traceback; |
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15 |
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16 local lmdb = require"lightningmdb"; |
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17 local lfs = require"lfs"; |
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18 local path = require"util.paths"; |
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19 local serialization = require"util.serialization"; |
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20 local serialize = serialization.serialize; |
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21 local deserialize = serialization.deserialize; |
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22 |
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23 local function transaction(env, func, ...) |
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24 local args, n_args = {...}, select("#", ...); |
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25 local t = env:txn_begin(nil, 0); |
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26 local function f() return func(t, unpack(args, 1, n_args)); end |
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27 local success, a, b, c = xpcall(f, traceback); |
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28 if not success then |
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29 io.stderr:write(a, "\n\n"); |
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30 t:abort(); |
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31 os.exit() |
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32 return success, a; |
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33 end |
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34 local ok, err = t:commit(); |
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35 if not ok then |
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36 return ok, err; |
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37 end |
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38 return success, a, b, c; |
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39 end |
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40 |
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41 local function keyvalue_set(t, db, key, value) |
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42 if value ~= nil then |
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43 return assert(t:put(db, key, value, 0)); |
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44 else |
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45 return t:del(db, key, value); |
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46 end |
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47 end |
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48 |
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49 local function keyvalue_get(t, db, key) |
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50 local data, err = t:get(db, key, 0); |
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51 assert(data or not err, err); |
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52 return data; |
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53 end |
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54 |
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55 local drivers = {}; |
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56 local provider = {}; |
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57 |
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58 local keyval = {}; |
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59 local keyval_mt = { __index = keyval, flags = lmdb.MDB_CREATE }; |
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60 drivers.keyval = keyval_mt; |
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61 |
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62 function keyval:set(key, value) |
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63 if type(value) == "table" and next(value) == nil then |
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64 value = nil; |
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65 end |
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66 if value ~= nil then |
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67 value = serialize(value); |
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68 end |
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69 return transaction(self.env, keyvalue_set, self.db, key, value); |
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70 end |
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71 |
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72 function keyval:get(key) |
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73 local ok, data = transaction(self.env, keyvalue_get, self.db, key); |
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74 if not ok then return ok, data; end |
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75 return deserialize(data); |
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76 end |
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77 |
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78 function provider:init(config) |
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79 if config.base_path then |
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80 lfs.mkdir(config.base_path); |
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81 end |
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82 local env = lmdb.env_create(); |
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83 env:set_maxdbs(config.maxdbs or 20); |
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84 local env_flags = 0; |
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85 if config.flags then |
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86 for flag in config.flags do |
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87 env_flags = env_flags + assert(lmdb["MDB_"..flag:upper()], "No such flag "..flag); |
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88 end |
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89 end |
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90 env:open(config.base_path or ".", env_flags, tonumber("640", 8)); |
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91 self.env = env; |
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92 end |
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93 |
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94 function provider:open(store, typ) |
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95 typ = typ or "keyval"; |
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96 local driver_mt = drivers[typ]; |
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97 if not driver_mt then |
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98 return nil, "unsupported-store"; |
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99 end |
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100 local env = self.env; |
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101 local t = env:txn_begin(nil, 0); |
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102 local db = t:dbi_open(store.."_"..typ, driver_mt.flags); |
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103 local ok, err = t:commit(); |
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104 if not ok then |
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105 module:log("error", "Could not open database %s_%s: %s", store, typ, tostring(err)); |
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106 return ok, err; |
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107 end |
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108 |
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109 return setmetatable({ env = env, store = store, type = typ, db = db }, driver_mt); |
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110 end |
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111 |
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112 if prosody then |
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113 provider:init({ |
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114 base_path = path.resolve_relative_path(prosody.paths.data, module.host); |
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115 flags = module:get_option_set("lmdb_flags", {}); |
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116 maxdbs = module:get_option_number("lmdb_maxdbs", 20); |
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117 }); |
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118 |
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119 function module.unload() --luacheck: ignore |
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120 provider.env:sync(1); |
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121 provider.env:close(); |
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122 end |
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123 |
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124 module:provides("storage", provider); |
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125 else |
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126 return provider; |
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127 end |