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use std::io;
use crate::{B3Digest, Error};
mod grpc;
mod memory;
mod sled;
pub use self::grpc::GRPCBlobService;
pub use self::memory::MemoryBlobService;
pub use self::sled::SledBlobService;
/// The base trait all BlobService services need to implement.
/// It provides functions to check whether a given blob exists,
/// a way to get a [io::Read] to a blob, and a method to initiate writing a new
/// Blob, which returns a [BlobWriter], that can be used
pub trait BlobService {
type BlobReader: io::Read + Send + std::marker::Unpin;
type BlobWriter: BlobWriter + Send;
/// Check if the service has the blob, by its content hash.
fn has(&self, digest: &B3Digest) -> Result<bool, Error>;
/// Request a blob from the store, by its content hash. Returns a Option<BlobReader>.
fn open_read(&self, digest: &B3Digest) -> Result<Option<Self::BlobReader>, Error>;
/// Insert a new blob into the store. Returns a [BlobWriter], which
/// implements [io::Write] and a [BlobWriter::close].
/// TODO: is there any reason we want this to be a Result<>, and not just T?
fn open_write(&self) -> Result<Self::BlobWriter, Error>;
}
/// A [io::Write] that you need to close() afterwards, and get back the digest
/// of the written blob.
pub trait BlobWriter: io::Write {
/// Signal there's no more data to be written, and return the digest of the
/// contents written.
///
/// This consumes self, so it's not possible to close twice.
fn close(self) -> Result<B3Digest, Error>;
}
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