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annotate mod_storage_gdbm/mod_storage_gdbm.lua @ 1589:0da51b825263

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mod_http_muc_log: (template) Remove duplicate CSS property
author Kim Alvefur <zash@zash.se>
date Sat, 20 Dec 2014 21:56:13 +0100
parents 67fafebdceb7
children d9f3c66ea938
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67fafebdceb7 mod_storage_gdbm: Storage backend based on lgdbm
Kim Alvefur <zash@zash.se>
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1 -- mod_storage_gdbm
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2 -- Copyright (C) 2014 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 lgdbm:
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7 -- http://webserver2.tecgraf.puc-rio.br/~lhf/ftp/lua/#lgdbm
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8
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9 local gdbm = require"gdbm";
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10 local path = require"util.paths";
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11 local lfs = require"lfs";
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12 local serialize, deserialize = import("util.serialization", "serialize", "deserialize");
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13
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14 local base_path = path.resolve_relative_path(prosody.paths.data, module.host);
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15 lfs.mkdir(base_path);
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16
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17 local cache = {};
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18
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19 local driver = {};
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20 local driver_mt = { __index = driver };
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21
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22 function driver:set(user, value)
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23 local ok, err = gdbm.replace(self._db, user or "@", serialize(value));
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24 if not ok then return nil, err; end
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25 return true;
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26 end
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27
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28 function driver:get(user)
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29 local data, err = gdbm.fetch(self._db, user or "@");
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30 if not data then return nil, err; end
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31 return deserialize(data);
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32 end
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33
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34 function open(_, store, typ)
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35 typ = typ or "keyval";
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36 if typ ~= "keyval" then
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37 return nil, "unsupported-store";
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38 end
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39
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40 local db_path = path.join(base_path, store) .. ".db";
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41
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42 local db = cache[db_path];
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43 if not db then
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44 db = assert(gdbm.open(db_path, "c"));
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45 cache[db_path] = db;
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46 end
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47 return setmetatable({ _db = db; _path = db_path; store = store, typ = type }, driver_mt);
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48 end
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49
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50 function module.unload()
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51 for path, db in pairs(cache) do
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52 gdbm.sync(db);
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53 gdbm.close(db);
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54 end
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55 end
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56
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57 module:provides"storage";