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local error, type, pairs = error, type, pairs;
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 prosody = prosody;
module("storagemanager")
local olddm = {}; -- maintain old datamanager, for backwards compatibility
for k,v in pairs(datamanager) do olddm[k] = v; end
_M.olddm = olddm;
local null_storage_method = function () return false, "no data storage active"; end
local null_storage_driver = setmetatable(
{
name = "null",
open = function (self) return self; end
}, {
__index = function (self, method)
return null_storage_method;
end
}
);
local stores_available = multitable.new();
function initialize_host(host)
local host_session = hosts[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
prosody.events.add_handler("host-activated", initialize_host, 101);
function load_driver(host, driver_name)
if driver_name == "null" then
return null_storage_driver;
end
local driver = stores_available:get(host, driver_name);
if driver then return driver; end
local ok, err = modulemanager.load(host, "storage_"..driver_name);
if not ok then
log("error", "Failed to load storage driver plugin %s on %s: %s", driver_name, host, err);
end
return stores_available:get(host, driver_name);
end
function get_driver(host, store)
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
if not driver_name then
driver_name = config.get(host, "core", "default_storage") or "internal";
end
local driver = load_driver(host, driver_name);
if not driver then
log("warn", "Falling back to null driver for %s storage on %s", store, host);
driver_name = "null";
driver = null_storage_driver;
end
return driver, driver_name;
end
function open(host, store, typ)
local driver, driver_name = get_driver(host, store);
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 null driver",
driver_name, store, typ);
ret = null_storage_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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