[request] Add support for actix_multipart's Field for SdkBody::from

[ghost]

Describe the feature

Add the ability to upload data directly to S3 from an actix_multipart Field via a new From trait implementation in SdkBody.

Use Case

Currently there's no obvious way to transfer data from a Field directly to S3 with the AWS Rust SDK. If we were able to do this, it would speed up file uploads by not requiring the file to be fully uploaded to the server as a temporary file before then being sent to S3.

Proposed Solution

Create a new impl for the From trait to allow a Field to be wrapped in an SdkBody. This could then be consumed from ByteStream, allowing for data to be passed through from the user agent to S3 without going through a local temporary file.

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

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[rcoh]

To do this, you can use SdkBody::from_dyn.

To do this, you'd need to do something like this:

// possibly some pinning required?
struct ActixWrapper(Field)

impl http_body::Body<Data=Bytes, Error=Box<dyn Error + Send + Sync> for ActixWrapper {
  // use the `Stream` impl on `Field` to implement `data()` on `http_body::Body`
}

let sdk_body = SdkBody::from_dyn(ActixWrapper(field))

If you build this, it would probably be a helpful addition to aws-smithy-types-convert

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