Running async function periodically with Rocket | Rust Programming Language Community | Page 1

languid kindle Aug 9, 2022, 10:36 AM

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Hello! There's a function I need to run an async function every so often while keeping the Rocket webapp running. Basically I want rocket to continue serving normally while I have another async function doing its thing. I haven't found a go-to way to do this and spawning an additional tokio runtime that would let me run both the whole rocket and my other function side-by-side seems overkill. What do you think/recommend?

blazing pecan Aug 9, 2022, 10:37 AM

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tokio::spawn with a loop in it before starting the server

languid kindle Aug 9, 2022, 10:39 AM

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Thanks! I should really read up about tokio to have a better overview of how it works and common patterns. Is there some kind of introductory guide?

blazing pecan Aug 9, 2022, 10:40 AM

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https://tokio.rs/tokio/tutorial/spawning#tasks

Spawning | Tokio - An asynchronous Rust runtime

Tokio is a runtime for writing reliable asynchronous applications with Rust. It provides async I/O, networking, scheduling, timers, and more.

languid kindle Aug 9, 2022, 10:41 AM

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Perfect, thanks!

raven niche Aug 9, 2022, 11:29 AM

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Also, you wanted to make it only run periodically, I believe you could await on a sleep call in the task...?

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ferrisThink
https://docs.rs/tokio/latest/tokio/time/fn.interval.html

interval in tokio::time - Rust

Creates new [Interval] that yields with interval of period. The first tick completes immediately. The default [MissedTickBehavior] is Burst, but this can be configured by calling set_missed_tick_behavior.

languid kindle Aug 9, 2022, 11:43 AM

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raven niche Also, you wanted to make it only run periodically, I believe you could `await` o...

I'm doing something like that yes, thanks

#Running async function periodically with Rocket