客户端断开连接后的服务器清理 [英] Server cleanup after a client disconnects

问题描述

有没有办法通过刷新或离开页面来检测客户端何时断开与流星服务器的连接，以便服务器可以尝试进行一些清理？

Is there a way to detect when a client disconnects from a meteor server, either by refreshing or navigating away from the page, so that the server can attempt some cleanup?

推荐答案

一种技术是实现每个客户端定期调用的keepalive方法。假设您在每个客户的会话中保留了 user_id 。

One technique is to implement a "keepalive" method that each client regularly calls. This assumes you've got a user_id held in each client's Session.

// server code: heartbeat method
Meteor.methods({
  keepalive: function (user_id) {
    if (!Connections.findOne(user_id))
      Connections.insert({user_id: user_id});

    Connections.update(user_id, {$set: {last_seen: (new Date()).getTime()}});
  }
});

// server code: clean up dead clients after 60 seconds
Meteor.setInterval(function () {
  var now = (new Date()).getTime();
  Connections.find({last_seen: {$lt: (now - 60 * 1000)}}).forEach(function (user) {
    // do something here for each idle user
  });
});

// client code: ping heartbeat every 5 seconds
Meteor.setInterval(function () {
  Meteor.call('keepalive', Session.get('user_id'));
}, 5000);

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