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use crate::{response::IntoResponse, BoxError, Error};
use bytes::Bytes;
use futures_util::{
ready,
stream::{self, TryStream},
};
use http::{HeaderMap, Response};
use http_body::Body;
use pin_project_lite::pin_project;
use std::{
fmt,
pin::Pin,
task::{Context, Poll},
};
use sync_wrapper::SyncWrapper;
pin_project! {
pub struct StreamBody<S> {
#[pin]
stream: SyncWrapper<S>,
}
}
impl<S> StreamBody<S> {
pub fn new(stream: S) -> Self
where
S: TryStream + Send + 'static,
S::Ok: Into<Bytes>,
S::Error: Into<BoxError>,
{
Self {
stream: SyncWrapper::new(stream),
}
}
}
impl<S> IntoResponse for StreamBody<S>
where
S: TryStream + Send + 'static,
S::Ok: Into<Bytes>,
S::Error: Into<BoxError>,
{
type Body = Self;
type BodyError = Error;
fn into_response(self) -> Response<Self> {
Response::new(self)
}
}
impl Default for StreamBody<futures_util::stream::Empty<Result<Bytes, Error>>> {
fn default() -> Self {
Self::new(stream::empty())
}
}
impl<S> fmt::Debug for StreamBody<S> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_tuple("StreamBody").finish()
}
}
impl<S> Body for StreamBody<S>
where
S: TryStream,
S::Ok: Into<Bytes>,
S::Error: Into<BoxError>,
{
type Data = Bytes;
type Error = Error;
fn poll_data(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<Result<Self::Data, Self::Error>>> {
let stream = self.project().stream.get_pin_mut();
match ready!(stream.try_poll_next(cx)) {
Some(Ok(chunk)) => Poll::Ready(Some(Ok(chunk.into()))),
Some(Err(err)) => Poll::Ready(Some(Err(Error::new(err)))),
None => Poll::Ready(None),
}
}
fn poll_trailers(
self: Pin<&mut Self>,
_cx: &mut Context<'_>,
) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
Poll::Ready(Ok(None))
}
}
#[test]
fn stream_body_traits() {
use futures_util::stream::Empty;
type EmptyStream = StreamBody<Empty<Result<Bytes, BoxError>>>;
crate::test_helpers::assert_send::<EmptyStream>();
crate::test_helpers::assert_sync::<EmptyStream>();
crate::test_helpers::assert_unpin::<EmptyStream>();
}