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use std::collections::BTreeMap;
use crate::{path::PathComponent, Error, Node};
use futures::stream::BoxStream;
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: &PathComponent) -> Result<Option<Node>, Error>;
/// Lists all root CA nodes in the filesystem, as a tuple of (base)name
/// and Node.
/// An error can be returned in case listing is not allowed.
fn list(&self) -> BoxStream<Result<(PathComponent, Node), Error>>;
}
#[async_trait]
/// Implements RootNodes for something deref'ing to a BTreeMap of Nodes, where
/// the key is the node name.
impl<T> RootNodes for T
where
T: AsRef<BTreeMap<PathComponent, Node>> + Send + Sync,
{
async fn get_by_basename(&self, name: &PathComponent) -> Result<Option<Node>, Error> {
Ok(self.as_ref().get(name).cloned())
}
fn list(&self) -> BoxStream<Result<(PathComponent, Node), Error>> {
Box::pin(tokio_stream::iter(
self.as_ref()
.iter()
.map(|(name, node)| Ok((name.to_owned(), node.to_owned()))),
))
}
}
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