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Storing connected clients - websockets (programming.dev)

submitted 1 year ago by [email protected] to c/[email protected]

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Hello, I'm developing application which uses websockets for chatting feature.

I was wondering what is best way to store all client handles in server side. Every tutorial (eg. this) just says to store in some form of map. I figured that in large commercial apps list of clients would be rather high and I wondered if storing it on heap is actually valid implementation or if some other solutions like caching dbs like redis are used.

What's your experience with that?

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[–] [email protected] 2 points 1 year ago* (last edited 1 year ago)

Don't think the size really matters... an IP is 4 bytes, and the port another byte, plus lets say 4 bytes for the UserId. So with some overhead, you can practically put about 100k addresses in 1 MB.

With that many addresses, you should probably be more concerned about the lookup than the storage. I'd probably put then in a Dictionary[UserId, SocketData].

Websockets don't usually stay alive for long periods, so there's not much point of storing them in a database. Unless you're building something serverless, but then I wouldn't build something myself, but just use Firebase Cloud Messaging instead