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update messagebody documentation

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Rob Ede 2021-12-17 19:35:08 +00:00
parent 1d6f5ba6d6
commit 5842a3279d
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3 changed files with 25 additions and 6 deletions
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9
actix-http/CHANGES.md
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@ -1,12 +1,19 @@
# Changes
## Unreleased - 2021-xx-xx
### Added
* New method on `MessageBody` trait, `try_into_bytes`, with default implementation, for optimizations on body types that complete in exactly one poll. Replaces `is_complete_body` and `take_complete_body`. [#2522]
### Changed
* Rename trait `IntoHeaderPair => TryIntoHeaderPair`. [#2510]
* Rename `TryIntoHeaderPair::{try_into_header_pair => try_into_pair}`. [#2510]
* Rename trait `IntoHeaderValue => TryIntoHeaderValue`. [#2510]
### Removed
* `MessageBody::{is_complete_body,take_complete_body}`. [#2522]
[#2510]: https://github.com/actix/actix-web/pull/2510
[#2522]: https://github.com/actix/actix-web/pull/2522
## 3.0.0-beta.15 - 2021-12-11
@ -27,7 +34,7 @@
* `Request::take_conn_data()`. [#2491]
* `Request::take_req_data()`. [#2487]
* `impl Clone` for `RequestHead`. [#2487]
* New methods on `MessageBody` trait, `is_complete_body` and `take_complete_body`, both with default implementations, for optimisations on body types that are done in exactly one poll/chunk. [#2497]
* New methods on `MessageBody` trait, `is_complete_body` and `take_complete_body`, both with default implementations, for optimizations on body types that are done in exactly one poll/chunk. [#2497]
* New `boxed` method on `MessageBody` trait for wrapping body type. [#2520]
### Changed

20
actix-http/src/body/message_body.rs
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@ -17,11 +17,15 @@ use super::{BodySize, BoxBody};
/// An interface types that can converted to bytes and used as response bodies.
// TODO: examples
pub trait MessageBody {
// TODO: consider this bound to only fmt::Display since the error type is not really used
// and there is an impl for Into<Box<StdError>> on String
/// The type of error that will be returned if streaming body fails.
///
/// Since it is not appropriate to generate a response mid-stream, it only requires `Error` for
/// internal use and logging.
type Error: Into<Box<dyn StdError>>;
/// Body size hint.
///
/// If [`BodySize::None`] is returned, optimizations that skip reading the body are allowed.
fn size(&self) -> BodySize;
/// Attempt to pull out the next chunk of body bytes.
@ -31,9 +35,17 @@ pub trait MessageBody {
cx: &mut Context<'_>,
) -> Poll<Option<Result<Bytes, Self::Error>>>;
/// Convert this body into `Bytes`.
/// Try to convert into the complete chunk of body bytes.
///
/// Body types with `BodySize::None` are allowed to return empty `Bytes`.
/// Implement this method if the entire body can be trivially extracted. This is useful for
/// optimizations where `poll_next` calls can be avoided.
///
/// Body types with [`BodySize::None`] are allowed to return empty `Bytes`. Although, if calling
/// this method, it is recommended to check `size` first and return early.
///
/// # Errors
/// The default implementation will error and return the original type back to the caller for
/// further use.
#[inline]
fn try_into_bytes(self) -> Result<Bytes, Self>
where

2
actix-http/src/response.rs
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@ -170,7 +170,7 @@ impl<B> Response<B> {
/// Returns split head and body.
///
/// # Implementation Notes
/// Due to internal performance optimisations, the first element of the returned tuple is a
/// Due to internal performance optimizations, the first element of the returned tuple is a
/// `Response` as well but only contains the head of the response this was called on.
pub fn into_parts(self) -> (Response<()>, B) {
self.replace_body(())