contract EventTimer{
  function onCreate() {
    Global.timers = {};
  }
  
  export function init() {
    YancloudUtil.subscribe("timer", handler);
    return "done";
  }
  
  export function get(tag) {
    if (tag && Global.timers[tag]) {
      return String(Global.timers[tag]);
    }
    return JSON.stringify(Global.timers);
  }
  
  function handler(e) {
    Global.timers[e.content] = new Date().getTime();
  }
}