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use std::{
io::{Error as IoError, ErrorKind},
pin::Pin,
task::{Context, Poll},
};
use bytes::Bytes;
use futures::{stream::StreamExt, FutureExt};
use tokio::{
io::{AsyncRead, AsyncWrite},
sync::mpsc,
task::JoinHandle,
};
use tokio_stream::wrappers::ReceiverStream;
use tokio_util::{io::StreamReader, sync::PollSender};
use super::{
client::Client,
proto::{DeleteObjectRequest, ReadObjectRequest, UploadObjectRequest, UploadObjectResponse},
};
use crate::{async_trait, Result};
#[derive(Clone)]
pub struct Bucket {
client: Client,
bucket_name: String,
}
impl Bucket {
pub fn new(client: Client, bucket_name: impl Into<String>) -> Self {
Self {
client,
bucket_name: bucket_name.into(),
}
}
}
#[async_trait]
impl crate::Bucket for Bucket {
type SequentialWriter = SequentialWriter;
type SequentialReader = impl AsyncRead + Send + Unpin;
async fn delete_object(&self, name: &str) -> Result<()> {
let input = DeleteObjectRequest {
bucket: self.bucket_name.to_owned(),
object: name.to_owned(),
};
self.client.delete_object(input).await?;
Ok(())
}
async fn new_sequential_reader(&self, name: &str) -> Result<Self::SequentialReader> {
let input = ReadObjectRequest {
bucket: self.bucket_name.to_owned(),
object: name.to_owned(),
};
let stream = self.client.read_object(input).await?;
let byte_stream = stream.map(|res| {
res.map(|resp| Bytes::from(resp.content))
.map_err(|s| IoError::new(ErrorKind::Other, format!("{:?}", s)))
});
Ok(StreamReader::new(byte_stream))
}
async fn new_sequential_writer(&self, name: &str) -> Result<Self::SequentialWriter> {
Ok(SequentialWriter::new(
self.client.clone(),
self.bucket_name.to_owned(),
name.to_owned(),
))
}
}
type IoResult<T> = std::result::Result<T, IoError>;
pub struct SequentialWriter {
tx: PollSender<UploadObjectRequest>,
upload: JoinHandle<Result<UploadObjectResponse>>,
bucket_name: String,
object_name: String,
}
impl SequentialWriter {
fn new(client: Client, bucket_name: String, object_name: String) -> Self {
let (tx, rx) = mpsc::channel(16);
let tx = PollSender::new(tx);
let rx = ReceiverStream::new(rx);
let upload = tokio::spawn(async move { client.upload_object(rx).await });
Self {
tx,
upload,
bucket_name,
object_name,
}
}
}
impl AsyncWrite for SequentialWriter {
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<IoResult<usize>> {
self.tx.poll_send_done(cx).map(|ready| {
ready
.and_then(|_| {
let req = UploadObjectRequest {
bucket: self.bucket_name.clone(),
object: self.object_name.clone(),
content: buf.to_owned(),
};
self.tx.start_send(req)
})
.map(|_| buf.len())
.map_err(|err| IoError::new(ErrorKind::Other, err.to_string()))
})
}
fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<IoResult<()>> {
Poll::Ready(Ok(()))
}
fn poll_shutdown(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<IoResult<()>> {
match self.tx.poll_send_done(cx) {
Poll::Ready(ready) => match ready {
Ok(()) => {
self.tx.close_this_sender();
self.upload.poll_unpin(cx).map(|ready| {
ready
.map(|_| ())
.map_err(|err| IoError::new(ErrorKind::Other, err.to_string()))
})
}
Err(err) => Poll::Ready(Err(IoError::new(ErrorKind::Other, err.to_string()))),
},
Poll::Pending => Poll::Pending,
}
}
}
