Socket.IO 连接用户数 [英] Socket.IO Connected User Count

问题描述

我终于让Socket.IO正常工作了，但是我遇到了一个奇怪的问题.

I finally got Socket.IO to work properly, but I have encountered a strange problem.

我不确定这是否是最好的方法，但我正在使用:

I am not sure if this is the best way, but I am using:

io.sockets.clients().length

这将返回连接到我的服务器的客户端数量.问题是在用户几次连接和断开连接后，数字开始保持高于应有的水平.

This returns the number of clients connected to my server. The problem is after a few connects and disconnects of users, the number starts to stay higher than it should be.

例如，如果我连接并请我的朋友连接，数字会上升，这是正确的.但是当我们开始断开连接并重新连接时，数量并没有减少.

For instance, if I connect and ask my friends to, the number goes up which is correct. But when we start to disconnect and reconnect the number does not decrease.

我在 VMware 上运行 Node.js 和 Socket.IO 服务器href="https://en.wikipedia.org/wiki/Ubuntu_%28operating_system%29" rel="nofollow noreferrer">Ubuntu 服务器.

为什么会这样，或者是否有更好的方法来找出有多少人连接到服务器?

Why is this or is there a better method for finding out how many people are connected to the server?

推荐答案

有一个 github 问题为了这.问题是，每当有人断开 socket.io 时，不会从数组中删除( splice )，而是简单地将值设置为null"，因此实际上您的数组中有很多空值，这使您的客户端().length 比您在现实中拥有的连接更大.

There is a github issue for this. The problem is that whenever someone disconnects socket.io doesn't delete ( splice ) from the array, but simply sets the value to "null", so in fact you have a lot of null values in your array, which make your clients().length bigger than the connections you have in reality.

您必须以不同的方式管理客户的数量，例如类似的东西

You have to manage a different way for counting your clients, e.g. something like

socket.on('connect', function() { connectCounter++; });
socket.on('disconnect', function() { connectCounter--; });

这是一个思想嗡嗡声，为什么socket.io背后的人留下这样的东西，但最好在github问题中解释，我作为链接发布！

It's a mind buzz, why the people behind socket.io have left the things like that, but it is better explain in the github issue, which I posted as a link!

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