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100 lines
2.8 KiB
100 lines
2.8 KiB
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local error, type, pairs = error, type, pairs;
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local setmetatable = setmetatable;
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local config = require "core.configmanager";
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local datamanager = require "util.datamanager";
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local modulemanager = require "core.modulemanager";
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local multitable = require "util.multitable";
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local hosts = hosts;
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local log = require "util.logger".init("storagemanager");
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local prosody = prosody;
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module("storagemanager")
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local olddm = {}; -- maintain old datamanager, for backwards compatibility
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for k,v in pairs(datamanager) do olddm[k] = v; end
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_M.olddm = olddm;
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local null_storage_method = function () return false, "no data storage active"; end
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local null_storage_driver = setmetatable(
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{
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name = "null",
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open = function (self) return self; end
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}, {
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__index = function (self, method)
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return null_storage_method;
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end
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}
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);
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local stores_available = multitable.new();
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function initialize_host(host)
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local host_session = hosts[host];
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host_session.events.add_handler("item-added/data-driver", function (event)
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local item = event.item;
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stores_available:set(host, item.name, item);
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end);
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host_session.events.add_handler("item-removed/data-driver", function (event)
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local item = event.item;
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stores_available:set(host, item.name, nil);
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end);
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end
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prosody.events.add_handler("host-activated", initialize_host, 101);
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function load_driver(host, driver_name)
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if driver_name == "null" then
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return null_storage_driver;
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end
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local driver = stores_available:get(host, driver_name);
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if driver then return driver; end
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local ok, err = modulemanager.load(host, "storage_"..driver_name);
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if not ok then
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log("error", "Failed to load storage driver plugin %s on %s: %s", driver_name, host, err);
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end
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return stores_available:get(host, driver_name);
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end
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function open(host, store, typ)
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local storage = config.get(host, "core", "storage");
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local driver_name;
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local option_type = type(storage);
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if option_type == "string" then
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driver_name = storage;
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elseif option_type == "table" then
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driver_name = storage[store];
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end
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if not driver_name then
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driver_name = config.get(host, "core", "default_storage") or "internal";
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end
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local driver = load_driver(host, driver_name);
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if not driver then
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log("warn", "Falling back to null driver for %s storage on %s", store, host);
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driver_name = "null";
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driver = null_storage_driver;
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end
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local ret, err = driver:open(store, typ);
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if not ret then
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if err == "unsupported-store" then
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log("debug", "Storage driver %s does not support store %s (%s), falling back to null driver",
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driver_name, store, typ);
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ret = null_storage_driver;
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err = nil;
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end
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end
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return ret, err;
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end
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function datamanager.load(username, host, datastore)
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return open(host, datastore):get(username);
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end
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function datamanager.store(username, host, datastore, data)
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return open(host, datastore):set(username, data);
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end
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return _M;
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