Support for the equivalent of javascript's `setInterval`
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调研方向
Start by examining httpuv's WebSocket handling around the ws object and the server lifecycle, with the later-based example as the behavioral reference. Determine how a server-scheduled message API should work and ensure scheduled callbacks stop when the server is terminated; the issue does not name specific files or tests.
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描述
Most of the usage I've seen of httpuv's websocket functionality seems to use a method where the client will send a message which is then handled by the server which then responds with its own message.
For a project I am working on, a simpler solution is to have everything originate from the server which then sends a message on a scheduled basis out to the clients, i.e. something similar to what is possible with javascript's setInterval.
I've been able to achieve something like this by having a function recursively call itself with later on the desired interval,
onWSOpen = function(ws) {
interval = 2
f = function() {
msg = paste("Hello", Sys.time())
ws$send(msg)
later::later(f, interval)
}
f()
}
but this feels a bit hacky, and I'm currently stuck with the later calls persisting even after the server is terminated. I feel like I will be able to find a way of using the ws object and httpuv::listServers to include a halt condition, but again this feels super hacky.
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