this post was submitted on 24 Sep 2023
8 points (100.0% liked)
Rust
5999 readers
3 users here now
Welcome to the Rust community! This is a place to discuss about the Rust programming language.
Wormhole
Credits
- The icon is a modified version of the official rust logo (changing the colors to a gradient and black background)
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
I would likely do it in reverse. Try and find the object and if it doesn't exist create it.
That will always be prune to race conditions, where you check if someting exists (then some other thread creates it) and then you try to create it. You should always try to create first, then if it fails due to it already existing, fetch it. That is a good general rule for anything from hashmaps to databases.
That's true, but also trying to create first has a race condition too. The above code will panic at the unwrap if the record is deleted after the failed insert, and before the select
So, a loop it is....