53fb9ff4c6
Change-Id: I80e4f26c41a504fa4c6a013c2a1e76de613ba294 Reviewed-on: https://cl.tvl.fyi/c/depot/+/11078 Reviewed-by: Connor Brewster <cbrewster@hey.com> Tested-by: BuildkiteCI
83 lines
3.2 KiB
Rust
83 lines
3.2 KiB
Rust
use std::io;
|
|
use tonic::async_trait;
|
|
|
|
use crate::proto::stat_blob_response::ChunkMeta;
|
|
use crate::B3Digest;
|
|
|
|
mod chunked_reader;
|
|
mod combinator;
|
|
mod from_addr;
|
|
mod grpc;
|
|
mod memory;
|
|
mod naive_seeker;
|
|
mod simplefs;
|
|
mod sled;
|
|
|
|
#[cfg(test)]
|
|
mod tests;
|
|
|
|
pub use self::chunked_reader::ChunkedReader;
|
|
pub use self::combinator::CombinedBlobService;
|
|
pub use self::from_addr::from_addr;
|
|
pub use self::grpc::GRPCBlobService;
|
|
pub use self::memory::MemoryBlobService;
|
|
pub use self::simplefs::SimpleFilesystemBlobService;
|
|
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 read (and seek) a blob, and a method to create a blobwriter handle,
|
|
/// which will implement a writer interface, and also provides a close funtion,
|
|
/// to finalize a blob and get its digest.
|
|
#[async_trait]
|
|
pub trait BlobService: Send + Sync {
|
|
/// Check if the service has the blob, by its content hash.
|
|
/// On implementations returning chunks, this must also work for chunks.
|
|
async fn has(&self, digest: &B3Digest) -> io::Result<bool>;
|
|
|
|
/// Request a blob from the store, by its content hash.
|
|
/// On implementations returning chunks, this must also work for chunks.
|
|
async fn open_read(&self, digest: &B3Digest) -> io::Result<Option<Box<dyn BlobReader>>>;
|
|
|
|
/// Insert a new blob into the store. Returns a [BlobWriter], which
|
|
/// implements [tokio::io::AsyncWrite] and a [BlobWriter::close] to finalize
|
|
/// the blob and get its digest.
|
|
async fn open_write(&self) -> Box<dyn BlobWriter>;
|
|
|
|
/// Return a list of chunks for a given blob.
|
|
/// There's a distinction between returning Ok(None) and Ok(Some(vec![])).
|
|
/// The former return value is sent in case the blob is not present at all,
|
|
/// while the second one is sent in case there's no more granular chunks (or
|
|
/// the backend does not support chunking).
|
|
/// A default implementation checking for existence and then returning it
|
|
/// does not have more granular chunks available is provided.
|
|
async fn chunks(&self, digest: &B3Digest) -> io::Result<Option<Vec<ChunkMeta>>> {
|
|
if !self.has(digest).await? {
|
|
return Ok(None);
|
|
} else {
|
|
// default implementation, signalling the backend does not have more
|
|
// granular chunks available.
|
|
return Ok(Some(vec![]));
|
|
}
|
|
}
|
|
}
|
|
|
|
/// A [tokio::io::AsyncWrite] that the user needs to close() afterwards for persist.
|
|
/// On success, it returns the digest of the written blob.
|
|
#[async_trait]
|
|
pub trait BlobWriter: tokio::io::AsyncWrite + Send + Unpin {
|
|
/// Signal there's no more data to be written, and return the digest of the
|
|
/// contents written.
|
|
///
|
|
/// Closing a already-closed BlobWriter is a no-op.
|
|
async fn close(&mut self) -> io::Result<B3Digest>;
|
|
}
|
|
|
|
/// BlobReader is a [tokio::io::AsyncRead] that also allows seeking.
|
|
pub trait BlobReader: tokio::io::AsyncRead + tokio::io::AsyncSeek + Send + Unpin + 'static {}
|
|
|
|
/// A [`io::Cursor<Vec<u8>>`] can be used as a BlobReader.
|
|
impl BlobReader for io::Cursor<&'static [u8]> {}
|
|
impl BlobReader for io::Cursor<&'static [u8; 0]> {}
|
|
impl BlobReader for io::Cursor<Vec<u8>> {}
|
|
impl BlobReader for tokio::fs::File {}
|