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local error, type = error, type;
local setmetatable = setmetatable;
local config = require "core.configmanager";
local datamanager = require "util.datamanager";
local modulemanager = require "core.modulemanager";
local multitable = require "util.multitable";
local hosts = hosts;
local log = require "util.logger".init("storagemanager");
local olddm = {}; -- maintain old datamanager, for backwards compatibility
for k,v in pairs(datamanager) do olddm[k] = v; end
module("storagemanager")
local default_driver_mt = { name = "internal" };
default_driver_mt.__index = default_driver_mt;
function default_driver_mt:open(store)
return setmetatable({ host = self.host, store = store }, default_driver_mt);
end
function default_driver_mt:get(user) return olddm.load(user, self.host, self.store); end
function default_driver_mt:set(user, data) return olddm.store(user, self.host, self.store, data); end
local stores_available = multitable.new();
function initialize_host(host)
host_session.events.add_handler("item-added/data-driver", function (event)
local item = event.item;
stores_available:set(host, item.name, item);
end);
host_session.events.add_handler("item-removed/data-driver", function (event)
local item = event.item;
stores_available:set(host, item.name, nil);
end);
end
local function load_driver(host, driver_name)
if not driver_name then
return;
end
local driver = stores_available:get(host, driver_name);
if not driver then
if driver_name ~= "internal" then
modulemanager.load(host, "storage_"..driver_name);
return stores_available:get(host, driver_name);
else
return setmetatable({host = host}, default_driver_mt);
end
end
end
function open(host, store, typ)
local storage = config.get(host, "core", "storage");
local driver_name;
local option_type = type(storage);
if option_type == "string" then
driver_name = storage;
elseif option_type == "table" then
driver_name = storage[store];
end
local driver = load_driver(host, driver_name);
if not driver then
driver_name = config.get(host, "core", "default_storage");
driver = load_driver(host, driver_name);
if not driver then
if storage or driver_name then
log("warn", "Falling back to default driver for %s storage on %s", store, host);
end
driver_name = "internal";
driver = load_driver(host, driver_name);
end
end
local ret, err = driver:open(store, typ);
if not ret then
if err == "unsupported-store" then
log("debug", "Storage driver %s does not support store %s (%s), falling back to internal driver",
driver_name, store, typ);
ret = setmetatable({ host = host, store = store }, default_driver_mt); -- default to default driver
err = nil;
end
end
return ret, err;
end
function datamanager.load(username, host, datastore)
return open(host, datastore):get(username);
end
function datamanager.store(username, host, datastore, data)
return open(host, datastore):set(username, data);
end
return _M;
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