Mercurial > prosody-modules

annotate mod_storage_lmdb/mod_storage_lmdb.lua @ 5648:c217f4edfc4f

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misc/mtail: Start of an mtail config Stashing it here in case anyone wants to continue working on it. Currently it's only counting log messages by level. Due to the permissions set by systemd on Prosody logs, mtail never managed to start correctly until permissions were manually relaxed.
author Kim Alvefur <zash@zash.se>
date Sun, 17 Sep 2023 13:36:30 +0200
parents 2ed6f6eeeaba
children
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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