diff options
| -rw-r--r-- | core/storagemanager.lua | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/core/storagemanager.lua b/core/storagemanager.lua index c312cf05..39eae120 100644 --- a/core/storagemanager.lua +++ b/core/storagemanager.lua @@ -99,11 +99,47 @@ local function get_driver(host, store) return driver, driver_name; end -local function open(host, store, typ) +local map_shim_mt = { + __index = { + get = function(self, username, key) + local ret, err = self.keyval_store:get(username); + if ret == nil and err then return nil, err end + return ret[key]; + end; + set = function(self, username, key, data) + local current, err = self.keyval_store:get(username); + if current == nil then + if err then + return nil, err; + else + current = {}; + end + end + current[key] = data; + return self.keyval_store:set(username, current); + end; + }; +} + +local open; + +local function create_map_shim(host, store) + local keyval_store, err = open(host, store, "keyval"); + if keyval_store == nil then return nil, err end + return setmetatable({ + keyval_store = keyval_store; + }, map_shim_mt); +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 + if typ == "map" then -- Use shim on top of keyval store + log("debug", "map storage driver unavailable, using shim on top of keyval store."); + return create_map_shim(host, store); + end log("debug", "Storage driver %s does not support store %s (%s), falling back to null driver", driver_name, store, typ or "<nil>"); ret = null_storage_driver; |