prosody-modules
9a4556a13cc7
mod_storage_lmdb/mod_storage_lmdb.lua

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mod_storage_lmdb/mod_storage_lmdb.lua @ 5488:9a4556a13cc7

mod_rest/example: Include 'application_type' in registration It defaults to "web", which in turn mandates https: redirect URIs, which would not work with this example using the OOB URI.
author Kim Alvefur <zash@zash.se>
date Fri, 26 May 2023 14:32:59 +0200
parent 1984:2ed6f6eeeaba
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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, flag, func, ...)
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24 local args, n_args = {...}, select("#", ...);
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25 local t = env:txn_begin(nil, flag);
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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 t:abort();
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30 return success, a;
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31 end
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32 local ok, err = t:commit();
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33 if not ok then
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34 return ok, err;
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35 end
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36 return success, a, b, c;
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37 end
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38
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39 local function keyvalue_set(t, db, key, value)
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40 if value ~= nil then
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41 return assert(t:put(db, key, value, 0));
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42 else
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43 return t:del(db, key, value);
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44 end
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45 end
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46
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47 local function keyvalue_get(t, db, key)
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48 local data, err = t:get(db, key, 0);
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49 assert(data or not err, err);
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50 return data;
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51 end
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52
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53 local drivers = {};
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54 local provider = {};
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56 local keyval = {};
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57 local keyval_mt = { __index = keyval, flags = lmdb.MDB_CREATE };
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58 drivers.keyval = keyval_mt;
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59
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60 function keyval:set(key, value)
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61 if type(value) == "table" and next(value) == nil then
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62 value = nil;
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63 end
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64 if value ~= nil then
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65 value = serialize(value);
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66 end
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67 return transaction(self.env, 0, keyvalue_set, self.db, key, value);
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68 end
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69
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70 function keyval:get(key)
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71 local ok, data = transaction(self.env, lmdb.MDB_RDONLY, keyvalue_get, self.db, key);
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72 if not ok then return ok, data; end
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73 return deserialize(data);
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74 end
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75
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76 function provider:init(config)
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77 if config.base_path then
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78 lfs.mkdir(config.base_path);
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79 end
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80 local env = lmdb.env_create();
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81 env:set_maxdbs(config.maxdbs or 20);
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82 local env_flags = 0;
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83 if config.flags then
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84 for flag in config.flags do
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85 env_flags = env_flags + assert(lmdb["MDB_"..flag:upper()], "No such flag "..flag);
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86 end
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87 end
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88 env:open(config.base_path or ".", env_flags, tonumber("640", 8));
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89 self.env = env;
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90 end
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91
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92 function provider:open(store, typ)
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93 typ = typ or "keyval";
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94 local driver_mt = drivers[typ];
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95 if not driver_mt then
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96 return nil, "unsupported-store";
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97 end
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98 local env = self.env;
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99 local t = env:txn_begin(nil, 0);
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100 local db = t:dbi_open(store.."_"..typ, driver_mt.flags);
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101 local ok, err = t:commit();
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102 if not ok then
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103 module:log("error", "Could not open database %s_%s: %s", store, typ, tostring(err));
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104 return ok, err;
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105 end
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106
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107 return setmetatable({ env = env, store = store, type = typ, db = db }, driver_mt);
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108 end
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109
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110 if prosody then
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111 provider:init({
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112 base_path = path.resolve_relative_path(prosody.paths.data, module.host);
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113 flags = module:get_option_set("lmdb_flags", {});
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114 maxdbs = module:get_option_number("lmdb_maxdbs", 20);
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115 });
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116
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117 function module.unload() --luacheck: ignore
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118 provider.env:sync(1);
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119 provider.env:close();
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120 end
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121
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122 module:provides("storage", provider);
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123 else
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124 return provider;
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125 end