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|
use std::{
pin::Pin,
task::{Context, Poll},
};
use bytes::Bytes;
use futures_util::TryStream;
use http::HeaderMap;
use http_body::Frame;
use http_body_util::BodyExt;
use pin_project_lite::pin_project;
use sync_wrapper::SyncWrapper;
use tower::BoxError;
type BoxBody = http_body_util::combinators::UnsyncBoxBody<Bytes, BoxError>;
#[derive(Debug)]
pub(crate) struct Body(BoxBody);
impl Body {
pub(crate) fn new<B>(body: B) -> Self
where
B: http_body::Body<Data = Bytes> + Send + 'static,
B::Error: Into<BoxError>,
{
Self(body.map_err(Into::into).boxed_unsync())
}
pub(crate) fn empty() -> Self {
Self::new(http_body_util::Empty::new())
}
pub(crate) fn from_stream<S>(stream: S) -> Self
where
S: TryStream + Send + 'static,
S::Ok: Into<Bytes>,
S::Error: Into<BoxError>,
{
Self::new(StreamBody {
stream: SyncWrapper::new(stream),
})
}
pub(crate) fn with_trailers(self, trailers: HeaderMap) -> WithTrailers<Self> {
WithTrailers {
inner: self,
trailers: Some(trailers),
}
}
}
impl Default for Body {
fn default() -> Self {
Self::empty()
}
}
macro_rules! body_from_impl {
($ty:ty) => {
impl From<$ty> for Body {
fn from(buf: $ty) -> Self {
Self::new(http_body_util::Full::from(buf))
}
}
};
}
body_from_impl!(&'static [u8]);
body_from_impl!(std::borrow::Cow<'static, [u8]>);
body_from_impl!(Vec<u8>);
body_from_impl!(&'static str);
body_from_impl!(std::borrow::Cow<'static, str>);
body_from_impl!(String);
body_from_impl!(Bytes);
impl http_body::Body for Body {
type Data = Bytes;
type Error = BoxError;
fn poll_frame(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>> {
Pin::new(&mut self.0).poll_frame(cx)
}
fn size_hint(&self) -> http_body::SizeHint {
self.0.size_hint()
}
fn is_end_stream(&self) -> bool {
self.0.is_end_stream()
}
}
pin_project! {
struct StreamBody<S> {
#[pin]
stream: SyncWrapper<S>,
}
}
impl<S> http_body::Body for StreamBody<S>
where
S: TryStream,
S::Ok: Into<Bytes>,
S::Error: Into<BoxError>,
{
type Data = Bytes;
type Error = BoxError;
fn poll_frame(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>> {
let stream = self.project().stream.get_pin_mut();
match std::task::ready!(stream.try_poll_next(cx)) {
Some(Ok(chunk)) => Poll::Ready(Some(Ok(Frame::data(chunk.into())))),
Some(Err(err)) => Poll::Ready(Some(Err(err.into()))),
None => Poll::Ready(None),
}
}
}
pub(crate) async fn to_bytes<T>(body: T) -> Result<Bytes, T::Error>
where
T: http_body::Body,
{
Ok(body.collect().await?.to_bytes())
}
pin_project! {
pub(crate) struct WithTrailers<B> {
#[pin]
inner: B,
trailers: Option<HeaderMap>,
}
}
impl<B> http_body::Body for WithTrailers<B>
where
B: http_body::Body,
{
type Data = B::Data;
type Error = B::Error;
fn poll_frame(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>> {
let this = self.project();
match std::task::ready!(this.inner.poll_frame(cx)) {
Some(frame) => Poll::Ready(Some(frame)),
None => {
if let Some(trailers) = this.trailers.take() {
Poll::Ready(Some(Ok(Frame::trailers(trailers))))
} else {
Poll::Ready(None)
}
}
}
}
}
|
