blob: d024121eaa39836bbeeaaf2ace90ececd41d8f94 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
use std::io;
use tonic::async_trait;
use crate::B3Digest;
mod from_addr;
mod grpc;
mod memory;
mod naive_seeker;
mod simplefs;
mod sled;
#[cfg(test)]
mod tests;
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 get a [io::Read] to a blob, and a method to initiate writing a new
/// Blob, which will return something implmenting io::Write, and providing 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.
async fn has(&self, digest: &B3Digest) -> io::Result<bool>;
/// Request a blob from the store, by its content hash.
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 [io::Write] and a [BlobWriter::close].
async fn open_write(&self) -> Box<dyn BlobWriter>;
}
/// A [tokio::io::AsyncWrite] that you need to close() afterwards, and get back
/// the digest of the written blob.
#[async_trait]
pub trait BlobWriter: tokio::io::AsyncWrite + Send + Sync + Unpin + 'static {
/// 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>;
}
/// 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<Vec<u8>> {}
impl BlobReader for tokio::fs::File {}
|
