use std::pin::Pin;

use crate::{proto::node::Node, Error};
use futures::Stream;
use tonic::async_trait;

/// Provides an interface for looking up root nodes  in tvix-castore by given
/// a lookup key (usually the basename), and optionally allow a listing.
#[async_trait]
pub trait RootNodes: Send + Sync {
    /// Looks up a root CA node based on the basename of the node in the root
    /// directory of the filesystem.
    async fn get_by_basename(&self, name: &[u8]) -> Result<Option<Node>, Error>;

    /// Lists all root CA nodes in the filesystem. An error can be returned
    /// in case listing is not allowed
    fn list(&self) -> Pin<Box<dyn Stream<Item = Result<Node, Error>> + Send>>;
}