node获取token和ticket并存储

const fs = require(‘fs‘)
const https = require(‘https‘)
const config = require(‘./config‘)

const write = (file, ca) => {
  // 获取token并写入
  switch (file) {
    case ‘token‘:
      httpsGet(‘access_token‘, `${config.publicPath}token?grant_type=client_credential&appid=${config.appId}&secret=${config.appSecret}`, ca)
      break;
    case ‘ticket‘:
      read(‘token‘, res => {
        httpsGet(‘jsapi_ticket‘, `${config.publicPath}ticket/getticket?access_token=${res.access_token.access_token}&type=jsapi`, ca)
      })
      break;
  }
}

const httpsGet = (filesName, getUrl, ca) => {
  // 请求token和ticket
  https.get(
    getUrl,
    function (data) {

      var str = "";
      data.on("data", function (chunk) {
        str += chunk; //监听数据响应，拼接数据片段
      })
      data.on("end", function () {

        let times = Date.parse(new Date())
        let result = `{"${filesName}":${str.toString()},"times":${times + 7200 * 1000}}`


        // 判断 jsapi_ticket 是否获取成功, 成功后写入，不成功侧打印 jsapi_ticket 获取失败
        if (filesName === ‘jsapi_ticket‘) {
          let resultObj = JSON.parse(result)
          if (resultObj.jsapi_ticket.errmsg !== ‘ok‘) {
            // 没有获取成功
            console.log(`jsapi_ticket 获取失败，写入失败, 原因：token错误，或其他错误`)

            return
          }
        }

        // console.log(result)
        const writeStream = fs.createWriteStream(`./config/json/${filesName}.json`);
        //写入数据，指定数据的编码格式
        writeStream.write(result, ‘utf8‘);
        //标记写入完成（写入完成后会广播一个finish事件）
        writeStream.end();

        //接收finish事件
        writeStream.on(‘finish‘, () => {
          console.log(‘写入完成‘);
          ca(JSON.parse(result))
        });
        //写入失败
        writeStream.on(‘error‘, () => {
          console.log(‘写入失败‘);
        })
      })
    })
}

const read = (file, ca) => {
  //读取文件(文件流的方式读取文件)（文件比较多的时候分开来读，这样不会卡死）
  // return new Promise((resolve, reject) => {

  // })

  let files = [‘access_token‘, ‘jsapi_ticket‘]
  let filesName = files[0]
  switch (file) {
    case ‘token‘:
      filesName = files[0]
      break;
    case ‘ticket‘:
      filesName = files[1]
      break;
  }
  let readStream = fs.createReadStream(`./config/json/${filesName}.json`);

  let str = ‘‘
  //接收读取到的数据
  readStream.on(‘data‘, (chunk) => {
    str += chunk;
  });

  //读取完成后触发
  readStream.on(‘end‘, (chunk) => {
    let res = JSON.parse(str)
    ca(res)
  });
  //读取失败
  readStream.on(‘error‘, (error) => {
    console.log(error);
  });
}

// 过期自动写入
(() => {
  read(‘token‘, res => {

    let times = Date.parse(new Date())

    if (times < res.times) {
      console.log("没过期")
    }
    if (times > res.times) {
      console.log("过期了")
      // 过期了
      // 写入token
      write(‘token‘, token_res => {
        console.log(`写入token成功 ---${token_res}`);

        // 写入token完成后写入ticket
        write(‘ticket‘, res => {
          console.log(`写入ticket成功 --- ${res}`)
        })
      })
    }
  })
})()


module.exports = {
  read
}