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use futures::stream::BoxStream;
use futures::StreamExt;
use nix_compat::store_path::StorePathRef;
use tonic::async_trait;
use tvix_castore::fs::{RootNodes, TvixStoreFs};
use tvix_castore::{blobservice::BlobService, directoryservice::DirectoryService};
use tvix_castore::{Error, Node, PathComponent};
use super::PathInfoService;
/// Helper to construct a [TvixStoreFs] from a [BlobService], [DirectoryService]
/// and [PathInfoService].
/// This avoids users to have to interact with the wrapper struct directly, as
/// it leaks into the type signature of TvixStoreFS.
pub fn make_fs<BS, DS, PS>(
blob_service: BS,
directory_service: DS,
path_info_service: PS,
list_root: bool,
show_xattr: bool,
) -> TvixStoreFs<BS, DS, RootNodesWrapper<PS>>
where
BS: BlobService + Send + Clone + 'static,
DS: DirectoryService + Send + Clone + 'static,
PS: PathInfoService + Send + Sync + Clone + 'static,
{
TvixStoreFs::new(
blob_service,
directory_service,
RootNodesWrapper(path_info_service),
list_root,
show_xattr,
)
}
/// Wrapper to satisfy Rust's orphan rules for trait implementations, as
/// RootNodes is coming from the [tvix-castore] crate.
#[doc(hidden)]
#[derive(Clone, Debug)]
pub struct RootNodesWrapper<T>(pub(crate) T);
/// Implements root node lookup for any [PathInfoService]. This represents a flat
/// directory structure like /nix/store where each entry in the root filesystem
/// directory corresponds to a CA node.
#[cfg(any(feature = "fuse", feature = "virtiofs"))]
#[async_trait]
impl<T> RootNodes for RootNodesWrapper<T>
where
T: PathInfoService + Send + Sync,
{
async fn get_by_basename(&self, name: &PathComponent) -> Result<Option<Node>, Error> {
let Ok(store_path) = StorePathRef::from_bytes(name.as_ref()) else {
return Ok(None);
};
Ok(self
.0
.get(*store_path.digest())
.await?
.map(|path_info| path_info.node))
}
fn list(&self) -> BoxStream<Result<(PathComponent, Node), Error>> {
Box::pin(self.0.list().map(|result| {
result.map(|path_info| {
let basename = path_info.store_path.to_string();
(
basename
.as_str()
.try_into()
.expect("Tvix bug: StorePath must be PathComponent"),
path_info.node,
)
})
}))
}
}
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