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Code Issues Releases Wiki Activity

add body to_bytes helper (#2158)

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Rob Ede 2021-04-13 13:34:22 +01:00 committed by GitHub
parent 4442535a45
commit 02ced426fd
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5 changed files with 157 additions and 57 deletions
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2
actix-http/CHANGES.md
View File

@ -3,6 +3,7 @@
## Unreleased - 2021-xx-xx
### Added
* `impl<T: MessageBody> MessageBody for Pin<Box<T>>`. [#2152]
* Helper `body::to_bytes` for async collecting message body into Bytes. [#2158]
### Changes
* The type parameter of `Response` no longer has a default. [#2152]
@ -22,6 +23,7 @@
[#2065]: https://github.com/actix/actix-web/pull/2065
[#2148]: https://github.com/actix/actix-web/pull/2148
[#2152]: https://github.com/actix/actix-web/pull/2152
[#2158]: https://github.com/actix/actix-web/pull/2158
## 3.0.0-beta.5 - 2021-04-02

46
actix-http/src/body/body_stream.rs
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@ -61,3 +61,49 @@ where
}
}
}
#[cfg(test)]
mod tests {
use actix_rt::pin;
use actix_utils::future::poll_fn;
use futures_util::stream;
use super::*;
use crate::body::to_bytes;
#[actix_rt::test]
async fn skips_empty_chunks() {
let body = BodyStream::new(stream::iter(
["1", "", "2"]
.iter()
.map(|&v| Ok(Bytes::from(v)) as Result<Bytes, ()>),
));
pin!(body);
assert_eq!(
poll_fn(|cx| body.as_mut().poll_next(cx))
.await
.unwrap()
.ok(),
Some(Bytes::from("1")),
);
assert_eq!(
poll_fn(|cx| body.as_mut().poll_next(cx))
.await
.unwrap()
.ok(),
Some(Bytes::from("2")),
);
}
#[actix_rt::test]
async fn read_to_bytes() {
let body = BodyStream::new(stream::iter(
["1", "", "2"]
.iter()
.map(|&v| Ok(Bytes::from(v)) as Result<Bytes, ()>),
));
assert_eq!(to_bytes(body).await.ok(), Some(Bytes::from("12")));
}
}

115
actix-http/src/body/mod.rs
View File

@ -1,5 +1,12 @@
//! Traits and structures to aid consuming and writing HTTP payloads.
use std::task::Poll;
use actix_rt::pin;
use actix_utils::future::poll_fn;
use bytes::{Bytes, BytesMut};
use futures_core::ready;
#[allow(clippy::module_inception)]
mod body;
mod body_stream;
@ -15,6 +22,50 @@ pub use self::response_body::ResponseBody;
pub use self::size::BodySize;
pub use self::sized_stream::SizedStream;
/// Collects the body produced by a `MessageBody` implementation into `Bytes`.
///
/// Any errors produced by the body stream are returned immediately.
///
/// # Examples
/// ```
/// use actix_http::body::{Body, to_bytes};
/// use bytes::Bytes;
///
/// # async fn test_to_bytes() {
/// let body = Body::Empty;
/// let bytes = to_bytes(body).await.unwrap();
/// assert!(bytes.is_empty());
///
/// let body = Body::Bytes(Bytes::from_static(b"123"));
/// let bytes = to_bytes(body).await.unwrap();
/// assert_eq!(bytes, b"123"[..]);
/// # }
/// ```
pub async fn to_bytes(body: impl MessageBody) -> Result<Bytes, crate::Error> {
let cap = match body.size() {
BodySize::None | BodySize::Empty | BodySize::Sized(0) => return Ok(Bytes::new()),
BodySize::Sized(size) => size as usize,
BodySize::Stream => 32_768,
};
let mut buf = BytesMut::with_capacity(cap);
pin!(body);
poll_fn(|cx| loop {
let body = body.as_mut();
match ready!(body.poll_next(cx)) {
Some(Ok(bytes)) => buf.extend(bytes),
None => return Poll::Ready(Ok(())),
Some(Err(err)) => return Poll::Ready(Err(err)),
}
})
.await?;
Ok(buf.freeze())
}
#[cfg(test)]
mod tests {
use std::pin::Pin;
@ -22,7 +73,6 @@ mod tests {
use actix_rt::pin;
use actix_utils::future::poll_fn;
use bytes::{Bytes, BytesMut};
use futures_util::stream;
use super::*;
@ -187,58 +237,6 @@ mod tests {
);
}
#[actix_rt::test]
async fn body_stream_skips_empty_chunks() {
let body = BodyStream::new(stream::iter(
["1", "", "2"]
.iter()
.map(|&v| Ok(Bytes::from(v)) as Result<Bytes, ()>),
));
pin!(body);
assert_eq!(
poll_fn(|cx| body.as_mut().poll_next(cx))
.await
.unwrap()
.ok(),
Some(Bytes::from("1")),
);
assert_eq!(
poll_fn(|cx| body.as_mut().poll_next(cx))
.await
.unwrap()
.ok(),
Some(Bytes::from("2")),
);
}
mod sized_stream {
use super::*;
#[actix_rt::test]
async fn skips_empty_chunks() {
let body = SizedStream::new(
2,
stream::iter(["1", "", "2"].iter().map(|&v| Ok(Bytes::from(v)))),
);
pin!(body);
assert_eq!(
poll_fn(|cx| body.as_mut().poll_next(cx))
.await
.unwrap()
.ok(),
Some(Bytes::from("1")),
);
assert_eq!(
poll_fn(|cx| body.as_mut().poll_next(cx))
.await
.unwrap()
.ok(),
Some(Bytes::from("2")),
);
}
}
#[actix_rt::test]
async fn test_body_casting() {
let mut body = String::from("hello cast");
@ -252,4 +250,15 @@ mod tests {
let not_body = resp_body.downcast_ref::<()>();
assert!(not_body.is_none());
}
#[actix_rt::test]
async fn test_to_bytes() {
let body = Body::Empty;
let bytes = to_bytes(body).await.unwrap();
assert!(bytes.is_empty());
let body = Body::Bytes(Bytes::from_static(b"123"));
let bytes = to_bytes(body).await.unwrap();
assert_eq!(bytes, b"123"[..]);
}
}

5
actix-http/src/body/response_body.rs
View File

@ -55,10 +55,7 @@ impl<B: MessageBody> MessageBody for ResponseBody<B> {
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<Result<Bytes, Error>>> {
match self.project() {
ResponseBodyProj::Body(body) => body.poll_next(cx),
ResponseBodyProj::Other(body) => Pin::new(body).poll_next(cx),
}
Stream::poll_next(self, cx)
}
}

46
actix-http/src/body/sized_stream.rs
View File

@ -61,3 +61,49 @@ where
}
}
}
#[cfg(test)]
mod tests {
use actix_rt::pin;
use actix_utils::future::poll_fn;
use futures_util::stream;
use super::*;
use crate::body::to_bytes;
#[actix_rt::test]
async fn skips_empty_chunks() {
let body = SizedStream::new(
2,
stream::iter(["1", "", "2"].iter().map(|&v| Ok(Bytes::from(v)))),
);
pin!(body);
assert_eq!(
poll_fn(|cx| body.as_mut().poll_next(cx))
.await
.unwrap()
.ok(),
Some(Bytes::from("1")),
);
assert_eq!(
poll_fn(|cx| body.as_mut().poll_next(cx))
.await
.unwrap()
.ok(),
Some(Bytes::from("2")),
);
}
#[actix_rt::test]
async fn read_to_bytes() {
let body = SizedStream::new(
2,
stream::iter(["1", "", "2"].iter().map(|&v| Ok(Bytes::from(v)))),
);
assert_eq!(to_bytes(body).await.ok(), Some(Bytes::from("12")));
}
}