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Diffstat (limited to 'core')
-rw-r--r--core/storagemanager.lua84
1 files changed, 54 insertions, 30 deletions
diff --git a/core/storagemanager.lua b/core/storagemanager.lua
index 94cea3b3..811b7f48 100644
--- a/core/storagemanager.lua
+++ b/core/storagemanager.lua
@@ -4,7 +4,6 @@ local setmetatable = setmetatable;
local config = require "core.configmanager";
local datamanager = require "util.datamanager";
-local multitable = require "util.multitable";
local modulemanager = require "core.modulemanager";
local hosts = hosts;
local log = require "util.logger".init("storagemanager");
@@ -12,12 +11,9 @@ 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
-local driver_cache = multitable.new();
-local store_cache = multitable.new();
-
module("storagemanager")
-local default_driver_mt = {};
+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);
@@ -25,37 +21,65 @@ 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 function load_driver_for_host(host)
- if driver_cache:get(host) then return driver_cache:get(host); end
-
- local host_session = hosts[host];
- if not host_session then error("No such host"); end
-
- local driver_plugin = config.get(host, "core", "datastore");
- if not driver_plugin then return setmetatable({ host = host }, default_driver_mt); end
-
- local provider;
- local function handler(event) provider = event.item; end
- host_session.events.add_handler("item-added/data-driver", handler);
- local success, err = modulemanager.load(host, driver_plugin);
- host_session.events.remove_handler("item-added/data-driver", handler);
- if not success then error(err); end
- if not provider then error("Module didn't add a provider"); 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);
- driver_cache:set(host, provider);
- log("debug", "Data driver '%s' loaded for host '%s'", driver_plugin, host);
- return provider;
+ 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);
+ else
+ return setmetatable({host = host}, default_driver_mt);
+ end
+ end
end
function open(host, store, typ)
- local ret = store_cache:get(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
+
+ 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
+ driver_name = "internal";
+ log("warn", "Falling back to default driver for %s storage on %s", store, host);
+ driver = load_driver(host, driver_name);
+ end
+ end
+
+ local ret, err = driver:open(store, typ);
if not ret then
- local driver = load_driver_for_host(host);
- ret = driver:open(store, typ);
- if not ret then ret = setmetatable({ host = host, store = store }, default_driver_mt); end -- default to default driver
- store_cache:set(host, store, ret);
+ 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); end -- default to default driver
+ err = nil;
+ end
end
- return ret;
+ return ret, err;
end
function datamanager.load(username, host, datastore)