author | Kim Alvefur <zash@zash.se> |
Sat, 07 Feb 2015 22:22:46 +0100 | |
changeset 1607 | 1fbec16996f5 |
parent 1606 | 3912a53fd4db |
child 1608 | 53052a610c67 |
permissions | -rw-r--r-- |
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-- mod_storage_gdbm |
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-- Copyright (C) 2014 Kim Alvefur |
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-- |
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-- This file is MIT/X11 licensed. |
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-- |
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-- Depends on lgdbm: |
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-- http://webserver2.tecgraf.puc-rio.br/~lhf/ftp/lua/#lgdbm |
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|
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local gdbm = require"gdbm"; |
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local path = require"util.paths"; |
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local lfs = require"lfs"; |
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local uuid = require"util.uuid".generate; |
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local serialization = require"util.serialization"; |
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local st = require"util.stanza"; |
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local serialize = serialization.serialize; |
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local deserialize = serialization.deserialize; |
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local function id(v) return v; end |
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local function is_stanza(s) |
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return getmetatable(s) == st.stanza_mt; |
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end |
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local function ifelse(cond, iftrue, iffalse) |
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if cond then return iftrue; end return iffalse; |
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end |
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local base_path = path.resolve_relative_path(prosody.paths.data, module.host); |
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lfs.mkdir(base_path); |
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local cache = {}; |
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local keyval = {}; |
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local keyval_mt = { __index = keyval, suffix = ".db" }; |
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function keyval:set(user, value) |
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local ok, err = gdbm.replace(self._db, user or "@", serialize(value)); |
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if not ok then return nil, err; end |
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return true; |
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end |
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function keyval:get(user) |
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local data, err = gdbm.fetch(self._db, user or "@"); |
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if not data then return nil, err; end |
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return deserialize(data); |
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end |
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local archive = {}; |
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local archive_mt = { __index = archive, suffix = ".adb" }; |
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archive.get = keyval.get; |
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archive.set = keyval.set; |
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function archive:append(username, key, when, with, value) |
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key = key or uuid(); |
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local meta = self:get(username); |
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if not meta then |
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meta = {}; |
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end |
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local i = meta[key] or #meta+1; |
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local type; |
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if is_stanza(value) then |
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type, value = "stanza", st.preserialize(value); |
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end |
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meta[i] = { key = key, when = when, with = with, type = type }; |
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meta[key] = i; |
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local ok, err = self:set(username, meta); |
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if not ok then return nil, err; end |
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ok, err = self:set(key, value); |
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if not ok then return nil, err; end |
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return key; |
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end |
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local deserialize = { |
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stanza = st.deserialize; |
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}; |
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function archive:find(username, query) |
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local meta = self:get(username); |
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local r = query.reverse; |
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local d = r and -1 or 1; |
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local s = meta[ifelse(r, query.before, query.after)]; |
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local limit = query.limit; |
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if s then |
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s = s + d; |
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else |
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s = ifelse(r, #meta, 1) |
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end |
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local e = ifelse(r, 1, #meta); |
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local c = 0; |
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return function () |
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if limit and c >= limit then return end |
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local item, value; |
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for i = s, e, d do |
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item = meta[i]; |
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if (not query.with or item.with == query.with) |
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and (not query.start or item.when >= query.start) |
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and (not query["end"] or item.when >= query["end"]) then |
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s = i + d; c = c + 1; |
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value = self:get(item.key); |
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return item.key, (deserialize[item.type] or id)(value), item.when, item.with; |
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end |
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end |
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end |
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end |
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local drivers = { |
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keyval = keyval_mt; |
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archive = archive_mt; |
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} |
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function open(_, store, typ) |
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typ = typ or "keyval"; |
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local driver_mt = drivers[typ]; |
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if not driver_mt then |
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return nil, "unsupported-store"; |
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end |
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|
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local db_path = path.join(base_path, store) .. driver_mt.suffix; |
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|
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local db = cache[db_path]; |
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if not db then |
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db = assert(gdbm.open(db_path, "c")); |
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cache[db_path] = db; |
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end |
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return setmetatable({ _db = db; _path = db_path; store = store, typ = type }, driver_mt); |
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end |
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|
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function module.unload() |
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for path, db in pairs(cache) do |
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gdbm.sync(db); |
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gdbm.close(db); |
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end |
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end |
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|
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module:provides"storage"; |