2 local error, type = error, type;
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 olddm = {}; -- maintain old datamanager, for backwards compatibility
13 for k,v in pairs(datamanager) do olddm[k] = v; end
15 module("storagemanager")
17 local default_driver_mt = { name = "internal" };
18 default_driver_mt.__index = default_driver_mt;
19 function default_driver_mt:open(store)
20 return setmetatable({ host = self.host, store = store }, default_driver_mt);
22 function default_driver_mt:get(user) return olddm.load(user, self.host, self.store); end
23 function default_driver_mt:set(user, data) return olddm.store(user, self.host, self.store, data); end
25 local stores_available = multitable.new();
27 function initialize_host(host)
28 host_session.events.add_handler("item-added/data-driver", function (event)
29 local item = event.item;
30 stores_available:set(host, item.name, item);
33 host_session.events.add_handler("item-removed/data-driver", function (event)
34 local item = event.item;
35 stores_available:set(host, item.name, nil);
39 local function load_driver(host, driver_name)
40 if not driver_name then
43 local driver = stores_available:get(host, driver_name);
45 if driver_name ~= "internal" then
46 modulemanager.load(host, "storage_"..driver_name);
48 return setmetatable({host = host}, default_driver_mt);
53 function open(host, store, typ)
54 local storage = config.get(host, "core", "storage");
56 local option_type = type(storage);
57 if option_type == "string" then
58 driver_name = storage;
59 elseif option_type == "table" then
60 driver_name = storage[store];
63 local driver = load_driver(host, driver_name);
65 driver_name = config.get(host, "core", "default_storage");
66 driver = load_driver(host, driver_name);
68 driver_name = "internal";
69 log("warn", "Falling back to default driver for %s storage on %s", store, host);
70 driver = load_driver(host, driver_name);
74 local ret, err = driver:open(store, typ);
76 if err == "unsupported-store" then
77 log("debug", "Storage driver %s does not support store %s (%s), falling back to internal driver",
78 driver_name, store, typ);
79 ret = setmetatable({ host = host, store = store }, default_driver_mt); -- default to default driver
86 function datamanager.load(username, host, datastore)
87 return open(host, datastore):get(username);
89 function datamanager.store(username, host, datastore, data)
90 return open(host, datastore):set(username, data);