2 local error, type, pairs = error, type, pairs;
3 local setmetatable = setmetatable;
5 local config = require "core.configmanager";
6 local datamanager = require "util.datamanager";
7 local modulemanager = require "core.modulemanager";
8 local multitable = require "util.multitable";
10 local log = require "util.logger".init("storagemanager");
12 local prosody = prosody;
14 module("storagemanager")
16 local olddm = {}; -- maintain old datamanager, for backwards compatibility
17 for k,v in pairs(datamanager) do olddm[k] = v; end
20 local null_storage_method = function () return false, "no data storage active"; end
21 local null_storage_driver = setmetatable(
24 open = function (self) return self; end
26 __index = function (self, method)
27 return null_storage_method;
32 local stores_available = multitable.new();
34 function initialize_host(host)
35 local host_session = hosts[host];
36 host_session.events.add_handler("item-added/data-driver", function (event)
37 local item = event.item;
38 stores_available:set(host, item.name, item);
41 host_session.events.add_handler("item-removed/data-driver", function (event)
42 local item = event.item;
43 stores_available:set(host, item.name, nil);
46 prosody.events.add_handler("host-activated", initialize_host, 101);
48 function load_driver(host, driver_name)
49 if driver_name == "null" then
50 return null_storage_provider;
52 local driver = stores_available:get(host, driver_name);
53 if driver then return driver; end
54 local ok, err = modulemanager.load(host, "storage_"..driver_name);
56 log("error", "Failed to load storage driver plugin %s on %s: %s", driver_name, host, err);
58 return stores_available:get(host, driver_name);
61 function open(host, store, typ)
62 local storage = config.get(host, "core", "storage");
64 local option_type = type(storage);
65 if option_type == "string" then
66 driver_name = storage;
67 elseif option_type == "table" then
68 driver_name = storage[store];
70 if not driver_name then
71 driver_name = config.get(host, "core", "default_storage") or "internal";
74 local driver = load_driver(host, driver_name);
76 log("warn", "Falling back to null driver for %s storage on %s", store, host);
78 driver = null_storage_driver;
81 local ret, err = driver:open(store, typ);
83 if err == "unsupported-store" then
84 log("debug", "Storage driver %s does not support store %s (%s), falling back to null driver",
85 driver_name, store, typ);
86 ret = null_storage_driver;
93 function datamanager.load(username, host, datastore)
94 return open(host, datastore):get(username);
96 function datamanager.store(username, host, datastore, data)
97 return open(host, datastore):set(username, data);