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use crate::blobservice::BlobService;
use core::pin::pin;
use futures::TryFutureExt;
use std::{
collections::VecDeque,
io,
ops::{Deref, DerefMut},
pin::Pin,
sync::Arc,
};
use tokio_stream::StreamExt;
use tokio_util::io::ReaderStream;
use tonic::{async_trait, Request, Response, Status, Streaming};
use tracing::{instrument, warn};
pub struct GRPCBlobServiceWrapper {
blob_service: Arc<dyn BlobService>,
}
impl From<Arc<dyn BlobService>> for GRPCBlobServiceWrapper {
fn from(value: Arc<dyn BlobService>) -> Self {
Self {
blob_service: value,
}
}
}
// This is necessary because bytes::BytesMut comes up with
// a default 64 bytes capacity that cannot be changed
// easily if you assume a bytes::BufMut trait implementation
// Therefore, we override the Default implementation here
// TODO(raitobezarius?): upstream me properly
struct BytesMutWithDefaultCapacity<const N: usize> {
inner: bytes::BytesMut,
}
impl<const N: usize> Deref for BytesMutWithDefaultCapacity<N> {
type Target = bytes::BytesMut;
fn deref(&self) -> &Self::Target {
&self.inner
}
}
impl<const N: usize> DerefMut for BytesMutWithDefaultCapacity<N> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.inner
}
}
impl<const N: usize> Default for BytesMutWithDefaultCapacity<N> {
fn default() -> Self {
BytesMutWithDefaultCapacity {
inner: bytes::BytesMut::with_capacity(N),
}
}
}
impl<const N: usize> bytes::Buf for BytesMutWithDefaultCapacity<N> {
fn remaining(&self) -> usize {
self.inner.remaining()
}
fn chunk(&self) -> &[u8] {
self.inner.chunk()
}
fn advance(&mut self, cnt: usize) {
self.inner.advance(cnt);
}
}
unsafe impl<const N: usize> bytes::BufMut for BytesMutWithDefaultCapacity<N> {
fn remaining_mut(&self) -> usize {
self.inner.remaining_mut()
}
unsafe fn advance_mut(&mut self, cnt: usize) {
self.inner.advance_mut(cnt);
}
fn chunk_mut(&mut self) -> &mut bytes::buf::UninitSlice {
self.inner.chunk_mut()
}
}
#[async_trait]
impl super::blob_service_server::BlobService for GRPCBlobServiceWrapper {
// https://github.com/tokio-rs/tokio/issues/2723#issuecomment-1534723933
type ReadStream =
Pin<Box<dyn futures::Stream<Item = Result<super::BlobChunk, Status>> + Send + 'static>>;
#[instrument(skip(self))]
async fn stat(
&self,
request: Request<super::StatBlobRequest>,
) -> Result<Response<super::StatBlobResponse>, Status> {
let rq = request.into_inner();
let req_digest = rq
.digest
.try_into()
.map_err(|_e| Status::invalid_argument("invalid digest length"))?;
match self.blob_service.has(&req_digest).await {
Ok(true) => Ok(Response::new(super::StatBlobResponse::default())),
Ok(false) => Err(Status::not_found(format!("blob {} not found", &req_digest))),
Err(e) => Err(e.into()),
}
}
#[instrument(skip(self))]
async fn read(
&self,
request: Request<super::ReadBlobRequest>,
) -> Result<Response<Self::ReadStream>, Status> {
let rq = request.into_inner();
let req_digest = rq
.digest
.try_into()
.map_err(|_e| Status::invalid_argument("invalid digest length"))?;
match self.blob_service.open_read(&req_digest).await {
Ok(Some(reader)) => {
fn stream_mapper(
x: Result<bytes::Bytes, io::Error>,
) -> Result<super::BlobChunk, Status> {
match x {
Ok(bytes) => Ok(super::BlobChunk { data: bytes }),
Err(e) => Err(Status::from(e)),
}
}
let chunks_stream = ReaderStream::new(reader).map(stream_mapper);
Ok(Response::new(Box::pin(chunks_stream)))
}
Ok(None) => Err(Status::not_found(format!("blob {} not found", &req_digest))),
Err(e) => Err(e.into()),
}
}
#[instrument(skip(self))]
async fn put(
&self,
request: Request<Streaming<super::BlobChunk>>,
) -> Result<Response<super::PutBlobResponse>, Status> {
let req_inner = request.into_inner();
let data_stream = req_inner.map(|x| {
x.map(|x| VecDeque::from(x.data.to_vec()))
.map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidInput, e))
});
let mut data_reader = tokio_util::io::StreamReader::new(data_stream);
let mut blob_writer = pin!(self.blob_service.open_write().await);
tokio::io::copy(&mut data_reader, &mut blob_writer)
.await
.map_err(|e| {
warn!("error copying: {}", e);
Status::internal("error copying")
})?;
let digest = blob_writer
.close()
.map_err(|e| {
warn!("error closing stream: {}", e);
Status::internal("error closing stream")
})
.await?
.to_vec();
Ok(Response::new(super::PutBlobResponse {
digest: digest.into(),
}))
}
}
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