http.lua里的装饰器

local co_yield = coroutine.yieldlocal co_create = coroutine.createlocal co_status = coroutine.statuslocal co_resume = coroutine.resumelocal select = select-- Reimplemented coroutine.wrap, returning "nil, err" if the coroutine cannot-- be resumed. This protects user code from inifite loops when doing things like-- repeat-- ??local chunk, err = res.body_reader()-- ??if chunk then -- <-- This could be a string msg in the core wrap function.-- ????...-- ??end-- until not chunklocal co_wrap = function(func) ???local co = co_create(func) ???if not co then ???????return nil, "could not create coroutine" ???else ???????return function(...) ???????????if co_status(co) == "suspended" then ???????????????return select(2, co_resume(co, ...)) ???????????else ???????????????return nil, "can‘t resume a " .. co_status(co) .. " coroutine" ???????????end ???????end ???endend