I'm diving into WebSockets and I'm finding the logic really challenging. I decided to set up a test where I have three clients: the first two are in a private chat room, and the third one is in broadcast mode. After spending five hours trying to implement this straightforward logic, I ran into issues with handling disconnections properly. This has me curious about how web frameworks and browsers manage concurrency, especially in situations with infinite loops.
3 Answers
Your question isn’t too clear, but to get more insight, I recommend looking into topics like event loops and OS APIs such as epoll or select. They can give you a better understanding of how concurrency is generally handled!
In production systems, there’s usually an 'overwatch' thread that checks in with the worker threads by receiving 'heartbeat' messages. If it doesn't get enough signals within a set timeframe, it can terminate the whole process. This is where tools like Kubernetes come in, as they monitor the health of the process and can restart it if it stops responding.
It's actually not an infinite loop! FastAPI (and similar frameworks) utilizes non-blocking sockets. If there's no message received, it yields control to the other connections. So, if you have 1000 clients connected, the system can 'skip' to any socket that has received data. This isn't technically perfect, but it's pretty close!
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