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update body type migration guide

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This commit is contained in:
Rob Ede
2022-02-09 16:12:39 +00:00
parent a9f445875a
commit 1b706b3069
3 changed files with 47 additions and 8 deletions
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16
actix-http/src/body/either.rs
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@ -10,6 +10,17 @@ use super::{BodySize, BoxBody, MessageBody};
use crate::Error;
pin_project! {
/// An "either" type specialized for body types.
///
/// It is common, in middleware especially, to conditionally return an inner service's unknown/
/// generic body `B` type or return early with a new response. This type's "right" variant
/// defaults to `BoxBody` since error responses are the common case.
///
/// For example, middleware will often have `type Response = ServiceResponse<EitherBody<B>>`.
/// This means that the inner service's response body type maps to the `Left` variant and the
/// middleware's own error responses use the default `Right` variant of `BoxBody`. Of course,
/// there's no reason it couldn't use `EitherBody<B, String>` instead if its alternative
/// responses have a known type.
#[project = EitherBodyProj]
#[derive(Debug, Clone)]
pub enum EitherBody<L, R = BoxBody> {
@ -22,7 +33,10 @@ pin_project! {
}
impl<L> EitherBody<L, BoxBody> {
/// Creates new `EitherBody` using left variant and boxed right variant.
/// Creates new `EitherBody` left variant with a boxed right variant.
///
/// If the expected `R` type will be inferred and is not `BoxBody` then use the
/// [`left`](Self::left) constructor instead.
#[inline]
pub fn new(body: L) -> Self {
Self::Left { body }

2
actix-http/src/body/message_body.rs
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@ -19,7 +19,7 @@ use super::{BodySize, BoxBody};
/// It is not usually necessary to create custom body types, this trait is already [implemented for
/// a large number of sensible body types](#foreign-impls) including:
/// - Empty body: `()`
/// - Text-based: `String`, `&'static str`, `ByteString`.
/// - Text-based: `String`, `&'static str`, [`ByteString`](https://docs.rs/bytestring/1).
/// - Byte-based: `Bytes`, `BytesMut`, `Vec<u8>`, `&'static [u8]`;
/// - Streams: [`BodyStream`](super::BodyStream), [`SizedStream`](super::SizedStream)
///