local M = {}

local localstorage = require("localstorage")
local fw = require("fastweb")
local cjson = require("cjson")

M.start = function(dirpath)
    local storage = localstorage.new()
    fw.set_ptr("localstorage_cache",storage:self())
    if storage:open(dirpath) == false then
        return false,storage:last_error()
    end
    return true
end

M.close = function()
    localstorage.new(localstorage_cache):close()
end
M.get = function(key)
    return localstorage.new(localstorage_cache):read(key)
end
M.get_json = function(key)
    local value = M.get(key)
    if value then
        return cjson.decode(value)
    end
    return nil
end
M.set = function(key,value)
    localstorage.new(localstorage_cache):write(key,value)
end
M.set_json = function(key,value)
    M.set(key,cjson.encode(value))
end
M.del = function(key)
    localstorage.new(localstorage_cache):del(key)
end
return M