--- 模块功能：远程升级
-- @module ntp
-- @author 朱天华
-- @license MIT
-- @copyright openLuat
-- @release 2017.11.14
require "misc"
require "utils"
require "socket"
require "log"
local sbyte, ssub = string.byte, string.sub
module(..., package.seeall)
-- 重试次数
local RETRY = 3
-- 升级包保存路径
local UPD_PATH = "/luazip/update.bin"
---  自动连接服务器，检查升级，下载升级包s
-- @return 无
-- @usage update.run()
uptate_ok = 0
function run()
    sys.taskInit(function()
        local cnt = 1
        for cnt = 1, RETRY do
            while not socket.isReady() do sys.waitUntil('IP_READY_IND') end
            local url = "/update/firmware_upgrade?imei=" .. misc.getimei() .. "&device_key=" .. misc.getsn()
                .. "&firmware_name=" .. _G.PROJECT .. "_" .. rtos.get_version() .. "&version=" .. _G.VERSION
            -- local code, head, body = http.request("GET", "http://www.yfzhwlw.com" .. url, 5000)
            local code, head, body = http.request("GET", "http://120.27.222.26" .. url, 5000)
            log.error("####################update http code is:",code)
            if code == "200" then
                io.writefile(UPD_PATH, body)
                uptate_ok = code
                break
            else
                uptate_ok = code
                break
            end
        end
        log.error("file_exists:",file_exists(UPD_PATH))
        log.error("length_of_file:",length_of_file(UPD_PATH))
    end)
end

-- 获得文件长度
-- 代码如下:

function length_of_file(filename)
    local fh = assert(io.open(filename, "rb"))
    local len = assert(fh:seek("end"))
    fh:close()
    return len
end

-- 判断文件是否存在
-- 复制代码 代码如下:

function file_exists(path)
    local file = io.open(path, "rb")
    if file then file:close() end
    return file ~= nil
end