Mercurial > prosody-modules

annotate mod_storage_lmdb/mod_storage_lmdb.lua @ 1981:1f815f57fa57

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mod_storage_lmdb: Factor out a transaction wrapper
author Kim Alvefur <zash@zash.se>
date Fri, 18 Dec 2015 22:00:00 +0100
parents 669d1208221a
children bb0b2eae5563
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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(user, 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, user, value);
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70 end
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71
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72 function keyval:get(user)
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73 local ok, data = transaction(self.env, keyvalue_get, self.db, user);
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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