4d135bcfa2
First attempt on composition of BlobServices. Change-Id: I6e70248007edfd322a503fd40c1c4b4300cbc30c Reviewed-on: https://cl.tvl.fyi/c/depot/+/10587 Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz> Autosubmit: flokli <flokli@flokli.de>
75 lines
2.8 KiB
Rust
75 lines
2.8 KiB
Rust
use std::io;
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use tonic::async_trait;
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use crate::proto::stat_blob_response::ChunkMeta;
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use crate::B3Digest;
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mod combinator;
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mod from_addr;
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mod grpc;
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mod memory;
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mod naive_seeker;
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mod simplefs;
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mod sled;
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#[cfg(test)]
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mod tests;
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pub use self::combinator::CombinedBlobService;
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pub use self::from_addr::from_addr;
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pub use self::grpc::GRPCBlobService;
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pub use self::memory::MemoryBlobService;
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pub use self::simplefs::SimpleFilesystemBlobService;
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pub use self::sled::SledBlobService;
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/// The base trait all BlobService services need to implement.
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/// It provides functions to check whether a given blob exists,
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/// a way to get a [io::Read] to a blob, and a method to initiate writing a new
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/// Blob, which will return something implmenting io::Write, and providing a
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/// close funtion, to finalize a blob and get its digest.
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#[async_trait]
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pub trait BlobService: Send + Sync {
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/// Check if the service has the blob, by its content hash.
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async fn has(&self, digest: &B3Digest) -> io::Result<bool>;
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/// Request a blob from the store, by its content hash.
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async fn open_read(&self, digest: &B3Digest) -> io::Result<Option<Box<dyn BlobReader>>>;
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/// Insert a new blob into the store. Returns a [BlobWriter], which
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/// implements [io::Write] and a [BlobWriter::close].
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async fn open_write(&self) -> Box<dyn BlobWriter>;
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/// Return a list of chunks for a given blob.
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/// There's a distinction between returning Ok(None) and Ok(Some(vec![])).
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/// The former return value is sent in case the blob is not present at all,
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/// while the second one is sent in case there's no more granular chunks (or
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/// the backend does not support chunking).
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/// A default implementation signalling the backend does not support
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/// chunking is provided.
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async fn chunks(&self, digest: &B3Digest) -> io::Result<Option<Vec<ChunkMeta>>> {
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if !self.has(digest).await? {
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return Ok(None);
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} else {
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// default implementation, signalling the backend does not support chunking.
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return Ok(Some(vec![]));
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}
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}
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}
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/// A [tokio::io::AsyncWrite] that you need to close() afterwards, and get back
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/// the digest of the written blob.
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#[async_trait]
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pub trait BlobWriter: tokio::io::AsyncWrite + Send + Sync + Unpin + 'static {
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/// Signal there's no more data to be written, and return the digest of the
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/// contents written.
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///
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/// Closing a already-closed BlobWriter is a no-op.
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async fn close(&mut self) -> io::Result<B3Digest>;
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}
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/// A [tokio::io::AsyncRead] that also allows seeking.
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pub trait BlobReader: tokio::io::AsyncRead + tokio::io::AsyncSeek + Send + Unpin + 'static {}
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/// A [`io::Cursor<Vec<u8>>`] can be used as a BlobReader.
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impl BlobReader for io::Cursor<Vec<u8>> {}
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impl BlobReader for tokio::fs::File {}
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