feat(aws-smithy-types): Impl http-body-1.0 Body for SdkBody (#3380)

## Motivation and Context
A step towards moving to http-1.0
awslabs/aws-sdk-rust#1046

(Russell): This is a minimal implementation of `http-body = 1`. It isn't
maximally efficient since even if we were given a 1x body, we convert it
back and forth first. This is a first step.

## Description
Implements http-body-1.0 Body trait for SdkBody.

## Testing
Regular CI

## Checklist
<!--- If a checkbox below is not applicable, then please DELETE it
rather than leaving it unchecked -->
- [x] I have updated `CHANGELOG.next.toml` if I made changes to the
smithy-rs codegen or runtime crates
- [x] I have updated `CHANGELOG.next.toml` if I made changes to the AWS
SDK, generated SDK code, or SDK runtime crates

----

_By submitting this pull request, I confirm that you can use, modify,
copy, and redistribute this contribution, under the terms of your
choice._

---------

Co-authored-by: Russell Cohen <rcoh@amazon.com>
Co-authored-by: Russell Cohen <russell.r.cohen@gmail.com>
Co-authored-by: John DiSanti <john@vinylsquid.com>
Co-authored-by: John DiSanti <jdisanti@amazon.com>

CHANGELOG.next.toml

@@ -17,7 +17,7 @@ references = ["smithy-rs#3416"]
 meta = { "breaking" = false, "bug" = false, "tada" = true }
 author = "jackkleeman"
 
-[[aws-sdk-rust]]
+[[smithy-rs]]
 message = "Added aws-smithy-wasm crate to enable SDK use in WASI compliant environments"
 references = ["smithy-rs#2087", "smithy-rs#2520", "smithy-rs#3409", "aws-sdk-rust#59"]
 meta = { "breaking" = false, "tada" = true, "bug" = false }
@@ -28,3 +28,9 @@ message = "Added aws-smithy-wasm crate to enable SDK use in WASI compliant envir
 references = ["smithy-rs#2087", "smithy-rs#2520", "smithy-rs#3409"]
 meta = { "breaking" = false, "tada" = true, "bug" = false, "target" = "client"}
 author = "landonxjames"
+
+[[smithy-rs]]
+message = "[`SdkBody`](https://docs.rs/aws-smithy-types/latest/aws_smithy_types/body/struct.SdkBody.html) now implements the 1.0 version of the `http_body::Body` trait."
+references = ["smithy-rs#3365", "aws-sdk-rust#1046"]
+meta = { "breaking" = false, "tada" = true, "bug" = false, "target" = "all" }
+author = "cayman-amzn"

rust-runtime/aws-smithy-types/Cargo.toml

@@ -13,7 +13,7 @@ repository = "https://github.com/smithy-lang/smithy-rs"
 [features]
 byte-stream-poll-next = []
 http-body-0-4-x = ["dep:http-body-0-4"]
-http-body-1-x = ["dep:http-body-1-0", "dep:http-body-util", "dep:http-body-0-4", "dep:http-1x"]
+http-body-1-x = ["dep:http-body-1-0", "dep:http-body-util", "dep:http-body-0-4", "dep:http-1x", "dep:hyper-1-0"]
 hyper-0-14-x = ["dep:hyper-0-14"]
 rt-tokio = [
     "dep:http-body-0-4",
@@ -38,6 +38,7 @@ http-body-0-4 = { package = "http-body", version = "0.4.4", optional = true }
 http-body-1-0 = { package = "http-body", version = "1", optional = true }
 http-body-util = { version = "0.1.0", optional = true }
 hyper-0-14 = { package = "hyper", version = "0.14.26", optional = true }
+hyper-1-0 = { package = "hyper", version = "1", optional = true }
 itoa = "1.0.0"
 num-integer = "0.1.44"
 pin-project-lite = "0.2.9"

rust-runtime/aws-smithy-types/src/body.rs

@@ -32,8 +32,6 @@ pin_project! {
     /// For handling responses, the type of the body will be controlled
     /// by the HTTP stack.
     ///
-    // TODO(naming): Consider renaming to simply `Body`, although I'm concerned about naming headaches
-    // between hyper::Body and our Body
     pub struct SdkBody {
         #[pin]
         inner: Inner,
@@ -191,10 +189,10 @@ impl SdkBody {
         }
     }
 
-    #[cfg(feature = "http-body-0-4-x")]
+    #[cfg(any(feature = "http-body-0-4-x", feature = "http-body-1-x",))]
     pub(crate) fn poll_next_trailers(
         self: Pin<&mut Self>,
-        #[allow(unused)] cx: &mut Context<'_>,
+        cx: &mut Context<'_>,
     ) -> Poll<Result<Option<http::HeaderMap<http::HeaderValue>>, Error>> {
         let this = self.project();
         match this.inner.project() {

rust-runtime/aws-smithy-types/src/body/http_body_1_x.rs

@@ -23,6 +23,53 @@ impl SdkBody {
     {
         SdkBody::from_body_0_4_internal(Http1toHttp04::new(body.map_err(Into::into)))
     }
+
+    pub(crate) fn poll_data_frame(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<http_body_1_0::Frame<Bytes>, Error>>> {
+        match ready!(self.as_mut().poll_next(cx)) {
+            // if there's no more data, try to return trailers
+            None => match ready!(self.poll_next_trailers(cx)) {
+                Ok(Some(trailers)) => Poll::Ready(Some(Ok(http_body_1_0::Frame::trailers(
+                    convert_headers_0x_1x(trailers),
+                )))),
+                Ok(None) => Poll::Ready(None),
+                Err(e) => Poll::Ready(Some(Err(e))),
+            },
+            Some(result) => match result {
+                Err(err) => Poll::Ready(Some(Err(err))),
+                Ok(bytes) => Poll::Ready(Some(Ok(http_body_1_0::Frame::data(bytes)))),
+            },
+        }
+    }
+}
+
+#[cfg(feature = "http-body-1-x")]
+impl http_body_1_0::Body for SdkBody {
+    type Data = Bytes;
+    type Error = Error;
+
+    fn poll_frame(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<http_body_1_0::Frame<Self::Data>, Self::Error>>> {
+        self.poll_data_frame(cx)
+    }
+
+    fn is_end_stream(&self) -> bool {
+        self.is_end_stream()
+    }
+
+    fn size_hint(&self) -> http_body_1_0::SizeHint {
+        let mut hint = http_body_1_0::SizeHint::default();
+        let (lower, upper) = self.bounds_on_remaining_length();
+        hint.set_lower(lower);
+        if let Some(upper) = upper {
+            hint.set_upper(upper);
+        }
+        hint
+    }
 }
 
 pin_project! {
@@ -83,7 +130,7 @@ where
         // already read everything
         let this = self.project();
         match this.trailers.take() {
-            Some(headers) => Poll::Ready(Ok(Some(convert_header_map(headers)))),
+            Some(headers) => Poll::Ready(Ok(Some(convert_headers_1x_0x(headers)))),
             None => Poll::Ready(Ok(None)),
         }
     }
@@ -107,7 +154,7 @@ where
     }
 }
 
-fn convert_header_map(input: http_1x::HeaderMap) -> http::HeaderMap {
+fn convert_headers_1x_0x(input: http_1x::HeaderMap) -> http::HeaderMap {
     let mut map = http::HeaderMap::with_capacity(input.capacity());
     let mut mem: Option<http_1x::HeaderName> = None;
     for (k, v) in input.into_iter() {
@@ -121,6 +168,20 @@ fn convert_header_map(input: http_1x::HeaderMap) -> http::HeaderMap {
     map
 }
 
+fn convert_headers_0x_1x(input: http::HeaderMap) -> http_1x::HeaderMap {
+    let mut map = http_1x::HeaderMap::with_capacity(input.capacity());
+    let mut mem: Option<http::HeaderName> = None;
+    for (k, v) in input.into_iter() {
+        let name = k.or_else(|| mem.clone()).unwrap();
+        map.append(
+            http_1x::HeaderName::from_bytes(name.as_str().as_bytes()).expect("already validated"),
+            http_1x::HeaderValue::from_bytes(v.as_bytes()).expect("already validated"),
+        );
+        mem = Some(name);
+    }
+    map
+}
+
 #[cfg(test)]
 mod test {
     use std::collections::VecDeque;
@@ -132,8 +193,9 @@ mod test {
     use http_1x::header::{CONTENT_LENGTH as CL1, CONTENT_TYPE as CT1};
     use http_1x::{HeaderMap, HeaderName, HeaderValue};
     use http_body_1_0::Frame;
+    use http_body_util::BodyExt;
 
-    use crate::body::http_body_1_x::convert_header_map;
+    use crate::body::http_body_1_x::{convert_headers_1x_0x, Http1toHttp04};
     use crate::body::{Error, SdkBody};
     use crate::byte_stream::ByteStream;
 
@@ -215,10 +277,46 @@ mod test {
         while let Some(_data) = http_body_0_4::Body::data(&mut body).await {}
         assert_eq!(
             http_body_0_4::Body::trailers(&mut body).await.unwrap(),
-            Some(convert_header_map(trailers()))
+            Some(convert_headers_1x_0x(trailers()))
         );
     }
 
+    #[tokio::test]
+    async fn test_read_trailers_as_1x() {
+        let body = TestBody {
+            chunks: vec![
+                Chunk::Data("123"),
+                Chunk::Data("456"),
+                Chunk::Data("789"),
+                Chunk::Trailers(trailers()),
+            ]
+            .into(),
+        };
+        let body = SdkBody::from_body_1_x(body);
+
+        let collected = BodyExt::collect(body).await.expect("should succeed");
+        assert_eq!(collected.trailers(), Some(&trailers()));
+        assert_eq!(collected.to_bytes().as_ref(), b"123456789");
+    }
+
+    #[tokio::test]
+    async fn test_trailers_04x_to_1x() {
+        let body = TestBody {
+            chunks: vec![
+                Chunk::Data("123"),
+                Chunk::Data("456"),
+                Chunk::Data("789"),
+                Chunk::Trailers(trailers()),
+            ]
+            .into(),
+        };
+        let body = SdkBody::from_body_0_4(Http1toHttp04::new(body));
+
+        let collected = BodyExt::collect(body).await.expect("should succeed");
+        assert_eq!(collected.trailers(), Some(&trailers()));
+        assert_eq!(collected.to_bytes().as_ref(), b"123456789");
+    }
+
     #[tokio::test]
     async fn test_errors() {
         let body = TestBody {
@@ -235,6 +333,7 @@ mod test {
         let body = ByteStream::new(body);
         body.collect().await.expect_err("body returned an error");
     }
+
     #[tokio::test]
     async fn test_no_trailers() {
         let body = TestBody {
@@ -262,6 +361,21 @@ mod test {
 
         expect.insert(CL0, http::HeaderValue::from_static("1234"));
 
-        assert_eq!(convert_header_map(http1_headermap), expect);
+        assert_eq!(convert_headers_1x_0x(http1_headermap), expect);
+    }
+
+    #[test]
+    fn sdkbody_debug_dyn() {
+        let body = TestBody {
+            chunks: vec![
+                Chunk::Data("123"),
+                Chunk::Data("456"),
+                Chunk::Data("789"),
+                Chunk::Trailers(trailers()),
+            ]
+            .into(),
+        };
+        let body = SdkBody::from_body_1_x(body);
+        assert!(format!("{:?}", body).contains("BoxBody"));
     }
 }

rust-runtime/aws-smithy-types/src/byte_stream.rs

@@ -248,7 +248,7 @@ pin_project! {
     /// 3. **From an `SdkBody` directly**: For more advanced / custom use cases, a ByteStream can be created directly
     /// from an SdkBody. **When created from an SdkBody, care must be taken to ensure retriability.** An SdkBody is retryable
     /// when constructed from in-memory data or when using [`SdkBody::retryable`](crate::body::SdkBody::retryable).
-    ///     ```no_run
+    ///     ```ignore
     ///     # use hyper_0_14 as hyper;
     ///     use aws_smithy_types::byte_stream::ByteStream;
     ///     use aws_smithy_types::body::SdkBody;