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Add axum_core::body::Body (#1584)
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davidpdrsn committed Mar 10, 2023
1 parent 8a3cd56 commit cc6377a
Showing 1 changed file with 92 additions and 2 deletions.
94 changes: 92 additions & 2 deletions axum-core/src/body.rs
Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,11 @@
use crate::{BoxError, Error};
use bytes::Bytes;
use bytes::{Buf, BufMut};
use http_body::Body;
use futures_util::stream::Stream;
use http::HeaderMap;
use http_body::Body as _;
use std::pin::Pin;
use std::task::{Context, Poll};

/// A boxed [`Body`] trait object.
///
Expand Down Expand Up @@ -55,7 +59,7 @@ where
// THE SOFTWARE.
pub(crate) async fn to_bytes<T>(body: T) -> Result<Bytes, T::Error>
where
T: Body,
T: http_body::Body,
{
futures_util::pin_mut!(body);

Expand Down Expand Up @@ -85,6 +89,92 @@ where
Ok(vec.into())
}

/// The body type used in axum requests and responses.
#[derive(Debug)]
pub struct Body(BoxBody);

impl Body {
/// Create a new `Body` that wraps another [`http_body::Body`].
pub fn new<B>(body: B) -> Self
where
B: http_body::Body<Data = Bytes> + Send + 'static,
B::Error: Into<BoxError>,
{
try_downcast(body).unwrap_or_else(|body| Self(boxed(body)))
}

/// Create an empty body.
pub fn empty() -> Self {
Self::new(http_body::Empty::new())
}
}

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::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 = Error;

#[inline]
fn poll_data(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> std::task::Poll<Option<Result<Self::Data, Self::Error>>> {
Pin::new(&mut self.0).poll_data(cx)
}

#[inline]
fn poll_trailers(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> std::task::Poll<Result<Option<HeaderMap>, Self::Error>> {
Pin::new(&mut self.0).poll_trailers(cx)
}

#[inline]
fn size_hint(&self) -> http_body::SizeHint {
self.0.size_hint()
}

#[inline]
fn is_end_stream(&self) -> bool {
self.0.is_end_stream()
}
}

impl Stream for Body {
type Item = Result<Bytes, Error>;

#[inline]
fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
self.poll_data(cx)
}
}

#[test]
fn test_try_downcast() {
assert_eq!(try_downcast::<i32, _>(5_u32), Err(5_u32));
Expand Down

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