prosody-modules
0a21b16b9075
mod_storage_lmdb/mod_storage_lmdb.lua

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mod_storage_lmdb/mod_storage_lmdb.lua @ 1755:0a21b16b9075

mod_storage_lmdb: Storage module using Lightning Memory-Mapped Database
author Kim Alvefur <zash@zash.se>
date Tue, 19 May 2015 23:29:37 +0200
child 1799:d2dd1db9ece6
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rev   line source
1755
0a21b16b9075 mod_storage_lmdb: Storage module using Lightning Memory-Mapped Database
Kim Alvefur <zash@zash.se>
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1 -- mod_storage_lmdb
0a21b16b9075 mod_storage_lmdb: Storage module using Lightning Memory-Mapped Database
Kim Alvefur <zash@zash.se>
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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 lmdb = require"lightningmdb";
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12 local lfs = require"lfs";
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13 local path = require"util.paths";
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14 local serialization = require"util.serialization";
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15 local serialize = serialization.serialize;
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16 local deserialize = serialization.deserialize;
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17
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18 local base_path = path.resolve_relative_path(prosody.paths.data, module.host);
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19 lfs.mkdir(base_path);
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20
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21 local env = lmdb.env_create();
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22 assert(env:set_maxdbs(module:get_option_number("lmdb_maxdbs", 20)));
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23 local env_flags = 0;
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24 for i, flag in ipairs(module:get_option_array("lmdb_flags", {})) do
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25 env_flags = env_flags + assert(lmdb["MDB_"..flag:upper()], "No such flag "..flag);
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26 end
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27 env:open(base_path, env_flags, tonumber("640", 8));
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28
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29 local keyval = {};
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30 local keyval_mt = { __index = keyval, flags = lmdb.MDB_CREATE };
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31
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32 function keyval:set(user, value)
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33 local t = self.env:txn_begin(nil, 0);
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34 if type(value) == "table" and next(value) == nil then
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35 value = nil;
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36 end
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37 if value ~= nil then
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38 value = serialize(value);
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39 end
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40 local ok, err;
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41 if value ~= nil then
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42 ok, err = t:put(self.db, user, value, 0);
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43 else
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44 ok, err = t:del(self.db, user, value);
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45 end
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46 if not ok then
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47 t:abort();
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48 return nil, err;
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49 end
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50 return t:commit();
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51 end
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52
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53 function keyval:get(user)
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54 local t = self.env:txn_begin(nil, 0);
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55 local data, err = t:get(self.db, user, 0);
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56 if not data then
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57 t:abort();
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58 return nil, err;
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59 end
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60 t:commit();
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61 return deserialize(data);
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62 end
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63
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64 local drivers = {
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65 keyval = keyval_mt;
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66 }
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67
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68 function open(_, store, typ)
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69 typ = typ or "keyval";
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70 local driver_mt = drivers[typ];
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71 if not driver_mt then
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72 return nil, "unsupported-store";
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73 end
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74 local t = env:txn_begin(nil, 0);
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75 local db = t:dbi_open(store.."_"..typ, driver_mt.flags);
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76 assert(t:commit());
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77
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78 return setmetatable({ env = env, store = store, type = typ, db = db }, driver_mt);
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79 end
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80
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81 function module.unload()
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82 env:sync(1);
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83 env:close();
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84 end
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85
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86 module:provides("storage");