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mod from_addr;
mod grpc;
mod memory;
mod sled;
use std::pin::Pin;
use std::sync::Arc;
use futures::Stream;
use tonic::async_trait;
use crate::blobservice::BlobService;
use crate::directoryservice::DirectoryService;
use crate::{proto, Error};
pub use self::from_addr::from_addr;
pub use self::grpc::GRPCPathInfoService;
pub use self::memory::MemoryPathInfoService;
pub use self::sled::SledPathInfoService;
/// The base trait all PathInfo services need to implement.
#[async_trait]
pub trait PathInfoService: Send + Sync {
/// Create a new instance by passing in a connection URL, as well
/// as instances of a [PathInfoService] and [DirectoryService] (as the
/// [PathInfoService] needs to talk to them).
/// TODO: check if we want to make this async, instead of lazily connecting
fn from_url(
url: &url::Url,
blob_service: Arc<dyn BlobService>,
directory_service: Arc<dyn DirectoryService>,
) -> Result<Self, Error>
where
Self: Sized;
/// Retrieve a PathInfo message by the output digest.
async fn get(&self, digest: [u8; 20]) -> Result<Option<proto::PathInfo>, Error>;
/// Store a PathInfo message. Implementations MUST call validate and reject
/// invalid messages.
async fn put(&self, path_info: proto::PathInfo) -> Result<proto::PathInfo, Error>;
/// Return the nar size and nar sha256 digest for a given root node.
/// This can be used to calculate NAR-based output paths,
/// and implementations are encouraged to cache it.
async fn calculate_nar(&self, root_node: &proto::node::Node) -> Result<(u64, [u8; 32]), Error>;
/// Iterate over all PathInfo objects in the store.
/// Implementations can decide to disallow listing.
///
/// This returns a pinned, boxed stream. The pinning allows for it to be polled easily,
/// and the box allows different underlying stream implementations to be returned since
/// Rust doesn't support this as a generic in traits yet. This is the same thing that
/// [async_trait] generates, but for streams instead of futures.
fn list(&self) -> Pin<Box<dyn Stream<Item = Result<proto::PathInfo, Error>> + Send>>;
}
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