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What's the Rust way of storing fetched data from runtime for later use in the program? (programming.dev)
submitted 1 year ago by nerdblood@programming.dev to c/rust@programming.dev
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My program is small enough that in TS/JS I'd normally just store the data in some global variable to be access from whatever elsewhere in the app. But with Rust from what I can tell this doesn't seem to be a common practice. How should i handle this?

More specifically, I need to:

  1. program start, fetch data from my db (DONE)
  2. store this data somehow somewhere
  3. access said data (for read only in this use case)

Thanks for any insights here!

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[-] nerdblood@programming.dev 4 points 1 year ago

I might not need global state, the more I think about it. I'll start with passing a struct and see where that gets me, thanks!

[-] nous@programming.dev 3 points 1 year ago

Using OnceCell for inviting some static resource, like a regex expression. Or for storing something like a internal cache for a function is ok. But I would avoid using it to hold a application wide state that anything can drop in and modify. Passing around application state where it is needed is generally much better and far easier to test things with.

this post was submitted on 08 Jul 2023
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