Make a better macro/func to handle all func boilerplate about mimir HOT 3 CLOSED

Thinking this should actually just be a function that returns a 3 tuple of the (instances, indexes, index)

from mimir.

The problem I am running into with minimizing the boilerplate:

fn acquire_locks<'a>(
    instance_dir: &'a String,
    index_name: &'a String,
) -> Result<(
    RwLockReadGuard<'a, HashMap<String, Instance>>,
    RwLockReadGuard<'a, HashMap<String, Mutex<Index>>>,
    MutexGuard<'a, Index>,
)> {
    ensure_index_initialized(instance_dir, index_name)?;
    let instances = INSTANCES.read();
    let indexes = instances.get(instance_dir).unwrap().indexes.read();
    let index = indexes.get(index_name).unwrap().lock();
    Ok((instances, indexes, index))
}

Doesn't work because the local variables cannot be declared with lifetimes, which is needed to return them.

I only started learning Rust recently so I am not sure how to fix this. If someone has a better idea, I am all ears. The only idea I have right now is a proc macro to generate all the boilerplate in one line but I really dislike this solution (but it is still better than the current implementation...).

from mimir.

I think we should end up just making a proc macro with https://docs.rs/quote/latest/quote/

from mimir.