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use crate::{proto, Error};
mod grpc;
mod memory;
mod sled;
mod traverse;
mod utils;
pub use self::grpc::GRPCDirectoryService;
pub use self::memory::MemoryDirectoryService;
pub use self::sled::SledDirectoryService;
pub use self::traverse::traverse_to;
pub use self::utils::DirectoryTraverser;
/// The base trait all Directory services need to implement.
/// This is a simple get and put of [crate::proto::Directory], returning their
/// digest.
pub trait DirectoryService {
type DirectoriesIterator: Iterator<Item = Result<proto::Directory, Error>> + Send;
type DirectoryPutter: DirectoryPutter;
/// Get looks up a single Directory message by its digest.
/// In case the directory is not found, Ok(None) is returned.
fn get(&self, digest: &[u8; 32]) -> Result<Option<proto::Directory>, Error>;
/// Get uploads a single Directory message, and returns the calculated
/// digest, or an error.
fn put(&self, directory: proto::Directory) -> Result<[u8; 32], Error>;
/// Looks up a closure of [proto::Directory].
/// Ideally this would be a `impl Iterator<Item = Result<proto::Directory, Error>>`,
/// and we'd be able to add a default implementation for it here, but
/// we can't have that yet.
fn get_recursive(&self, root_directory_digest: &[u8; 32]) -> Self::DirectoriesIterator;
/// Allows persisting a closure of [proto::Directory], which is a graph of
/// connected Directory messages.
fn put_multiple_start(&self) -> Self::DirectoryPutter;
}
/// Provides a handle to put a closure of connected [proto::Directory] elements.
///
/// The consumer can periodically call [put], starting from the leaves. Once
/// the root is reached, [close] can be called to retrieve the root digest (or
/// an error).
pub trait DirectoryPutter {
/// Put a individual [proto::Directory] into the store.
/// Error semantics and behaviour is up to the specific implementation of
/// this trait.
/// Due to bursting, the returned error might refer to an object previously
/// sent via `put`.
fn put(&mut self, directory: proto::Directory) -> Result<(), Error>;
/// Close the stream, and wait for any errors.
fn close(&mut self) -> Result<[u8; 32], Error>;
}
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