node-mongo-demo

node.js and mongodb demo

git clone https://9o.is/git/node-mongo-demo.git

timer.js

(674B)

      1 const nextInterval = (start, interval) => {
      2     const currentSeconds = Math.ceil(new Date() / 1000);
      3     const startSeconds = Math.floor(new Date(start).getTime() / 1000);
      4     const next = Math.ceil((currentSeconds - startSeconds) / interval) * interval;
      5     return new Date((startSeconds + next) * 1000);
      6 };
      7 
      8 const timer = session => {
      9     const { createdAt, gameIntervalInSeconds } = session;
     10     const nextIntervalAt = nextInterval(createdAt, gameIntervalInSeconds);
     11     const expiring = nextIntervalAt >= session.expiresAt;
     12 
     13     return expiring ? {} : {
     14         nextIntervalAt,
     15         nextIntervalInMillis: nextIntervalAt - Date.now(),
     16     };
     17 };
     18 
     19 export default timer;