.
├── app
│   ├── schedule
│   │   └── workflow.js
│   └── router.js

// /app/schedule/comsumer.js

module.exports = app => {
  return {
    schedule: {
      type: 'queue | workflow', // 扩展定时任务类型, 具体参考 [Egg.js Schedule](https://Quinton.org/zh-cn/basics/schedule.html#%E6%89%A9%E5%B1%95%E5%AE%9A%E6%97%B6%E4%BB%BB%E5%8A%A1%E7%B1%BB%E5%9E%8B)
      // below are self-defined args
      queue: 'speed_test',
      prefix: 'com.task.workflow',
      pattern: 'workflow',
    },
    // schedule 就是上面的 schedule
    async task(ctx, { schedule: { queueName }, msg, ackEvent }) {
      // do something stuff
    },
  };
};