跨水平服务器计算 socket.io 用户

问题描述：

我有多个使用 redisstore 水平扩展的 socket.io 服务器.我已经有效地设置了房间，并且能够成功地跨服务器向房间广播等.现在我正在尝试构建一个状态页面，但我未能弄清楚如何简单地计算连接的用户数量所有服务器.

I have multiple socket.io servers scaled horizontally using a redisstore. I've got rooms setup effectively and am successfully able to broadcast to rooms across servers, etc. Now I'm trying to build a status page and what I'm failing on figuring out is how to simply count the number of users connected across all servers.

io.sockets.clients('room') 和 io.sockets.sockets 只会告诉你那台服务器上连接的客户端数量，而不是所有服务器都连接到同一个 RedisStore.

io.sockets.clients('room') and io.sockets.sockets will only tell you the number of connected clients on that one server, not all servers connected to the same RedisStore.

建议?

谢谢.

答

我通过让每个服务器定期在 redis 中设置一个用户计数并包含他们自己的 pid 的过期时间解决了这个问题:

I solved this by having each server periodically set a user count in redis with an expiration that included their own pid:

每个都做 setex userCount:<间隔+10>

然后状态服务器可以查询这些键中的每一个，然后获取每个键的值:

then the status server can query for each of these keys, and then get the values for each key:

对于每个 keys userCount* 做 total+=get

for each keys userCount* do total+=get <key>

因此，如果服务器崩溃或关闭，那么它的计数将在间隔+10 后从 redis 中删除

so if a server crashes or is shutdown then its counts will drop out of redis after interval+10

对丑陋的伪代码感到抱歉.:)

sorry about the ugly pseudocode. :)

跨水平服务器计算 socket.io 用户

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