How to set static variable that require async initialization

help
1

Hi,

I'm new to Rust and trying to learn it by doing some small demo projects. Currently, I'm working on the Todo REST API example using Actix-web and SQLx crates. So far I have made it works well enough by creating SQLx pool inside of main and share it trough App::new().data(db_pool.clone()). Then I can access it through action handlers by using db_pool: web::Data<PgPool> and pass it to models where I can use it for database access.
It all works well, but I'm still not happy with it. I will prefer it if I don't need to pass it to each action handler and instead make it somehow accessible directly to models, for example like importing "db" module and use it like db::DB or something like that... I have found lazy_static crate and it looks exactly like something I wish to have, but it doesn't support async initialization...
After the whole weekend spent on trying to find some way to do it I just wish to check is it possible to do it that way, or I just keep using the app to share it?

Thanks for any help and suggestion...

2

So, generally you can't, without some placeholder value to exist in there until it is initialized.

For async I've found double-checked-cell-async — async Rust library // Lib.rs

However, global variables are generally problematic. Try initializing whatever you need first, and then passing it to functions that need it.

3

Thanks for explaining. When I have thought about that again, it was bad idea... thanks :slight_smile:

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