December 14th, 2022

Breaking Changes:

• 🐛⚠ (smithy-rs#1847) Support Sigv4 signature generation on PowerPC 32 and 64 bit. This architecture cannot compile ring, so the implementation has been updated to rely on hamc + sha2 to achive the same result with broader platform compatibility and higher performance. We also updated the CI which is now running as many tests as possible against i686 and PowerPC 32 and 64 bit.

• ⚠ (smithy-rs#1225, smithy-rs#1918) <service>::Client::from_conf_conn has been removed since it's now possible to configure the connection from the
  shared and service configs. To update your code, pass connections to the http_connector method during config creation.

  Example

  before:

      let conf = aws_sdk_sts::Config::builder()
          // The builder has no defaults but setting other fields is omitted for brevity...
          .build();
      let (server, request) = capture_request(None);
      let client = aws_sdk_sts::Client::from_conf_conn(conf, server);

  after:

      let (server, request) = capture_request(None);
      let conf = aws_sdk_sts::Config::builder()
          // The builder has no defaults but setting other fields is omitted for brevity...
          .http_connector(server)
          .build();
      let client = aws_sdk_sts::Client::from_conf(conf);

• ⚠ (smithy-rs#1935) Removed re-export of aws_smithy_client::retry::Config from the middleware module.

• ⚠ (smithy-rs#1926, smithy-rs#1819) Several breaking changes have been made to errors. See the upgrade guide for more information.

• ⚠ (smithy-rs#1945) Generate enums that guide the users to write match expressions in a forward-compatible way.
  Before this change, users could write a match expression against an enum in a non-forward-compatible way:

  match some_enum {
      SomeEnum::Variant1 => { /* ... */ },
      SomeEnum::Variant2 => { /* ... */ },
      Unknown(value) if value == "NewVariant" => { /* ... */ },
      _ => { /* ... */ },
  }

  This code can handle a case for "NewVariant" with a version of SDK where the enum does not yet include SomeEnum::NewVariant, but breaks with another version of SDK where the enum defines SomeEnum::NewVariant because the execution will hit a different match arm, i.e. the last one.
  After this change, users are guided to write the above match expression as follows:

  match some_enum {
      SomeEnum::Variant1 => { /* ... */ },
      SomeEnum::Variant2 => { /* ... */ },
      other @ _ if other.as_str() == "NewVariant" => { /* ... */ },
      _ => { /* ... */ },
  }

  This is forward-compatible because the execution will hit the second last match arm regardless of whether the enum defines SomeEnum::NewVariant or not.

• ⚠ (smithy-rs#1984, smithy-rs#1496) Functions on aws_smithy_http::endpoint::Endpoint now return a Result instead of panicking.

• ⚠ (smithy-rs#1984, smithy-rs#1496) Endpoint::mutable now takes impl AsRef<str> instead of Uri. For the old functionality, use Endpoint::mutable_uri.

• ⚠ (smithy-rs#1984, smithy-rs#1496) Endpoint::immutable now takes impl AsRef<str> instead of Uri. For the old functionality, use Endpoint::immutable_uri.

• ⚠ (smithy-rs#1983, smithy-rs#2029) Implementation of the Debug trait for container shapes now redacts what is printed per the sensitive trait.

• ⚠ (smithy-rs#2065) SdkBody callbacks have been removed. If you were using these, please file an issue so that we can better understand your use-case and provide the support you need.

• ⚠ (smithy-rs#2063) AwsEndpointStage, a middleware which set endpoints and auth has been split into AwsAuthStage and SmithyEndpointStage. Related types have also been renamed.

• ⚠ (smithy-rs#1989) The Unit type for a Union member is no longer rendered. The serializers and parsers generated now function accordingly in the absence of the inner data associated with the Unit type.

New this release:

• 🎉 (smithy-rs#1225, smithy-rs#1918)

  The HTTP connector used when making requests is now configurable through `SdkConfig`.

  use std::time::Duration;
  use aws_smithy_client::{Client, hyper_ext};
  use aws_smithy_client::erase::DynConnector;
  use aws_smithy_client::http_connector::ConnectorSettings;
  use aws_types::SdkConfig;
  
  let https_connector = hyper_rustls::HttpsConnectorBuilder::new()
      .with_webpki_roots()
      .https_only()
      .enable_http1()
      .enable_http2()
      .build();
  
  let smithy_connector = hyper_ext::Adapter::builder()
      // Optionally set things like timeouts as well
      .connector_settings(
          ConnectorSettings::builder()
              .connect_timeout(Duration::from_secs(5))
              .build()
      )
      .build(https_connector);
  
  let sdk_config = aws_config::from_env()
      .http_connector(smithy_connector)
      .load()
      .await;
  
  let client = Client::new(&sdk_config);
  
  // When sent, this operation will go through the custom smithy connector instead of
  // the default HTTP connector.
  let op = client
      .get_object()
      .bucket("some-test-bucket")
      .key("test.txt")
      .send()
      .await
      .unwrap();

• 🎉 (aws-sdk-rust#641, smithy-rs#1892, @albe-rosado) Ability to add an inline policy or a list of policy ARNs to the AssumeRoleProvider builder.

• 🎉 (smithy-rs#2044, smithy-rs#371) Fixed and improved the request tracing span hierarchy to improve log messages, profiling, and debuggability.

• (smithy-rs#1890) Add test to exercise excluded headers in aws-sigv4.

• (smithy-rs#1801) Add test ensuring that a response will error if the response body returns an EOF before the entire body has been read.

• (smithy-rs#1923) Fix cargo audit issue on criterion.

• (smithy-rs#1918) Add to_vec method to aws_smithy_http::byte_stream::AggregatedBytes.

• 🐛 (smithy-rs#1957) It was possible in some cases to send some S3 requests without a required upload ID, causing a risk of unintended data
  deletion and modification. Now, when an operation has query parameters that are marked as required, the omission of
  those query parameters will cause a BuildError, preventing the invalid operation from being sent.

• 🐛 (smithy-rs#2018) Normalize URI paths per RFC3986 when constructing canonical requests, except for S3.

• (smithy-rs#2064, aws-sdk-rust#632) The SDK clients now default max idle connections to 70 (previously unlimited) to reduce the likelihood of hitting max file handles in AWS Lambda.

• (smithy-rs#2057, smithy-rs#371) Add more tracing events to signing and event streams

• (smithy-rs#2062) Log an info on credentials cache miss and adjust level of some credential tracing spans/events.

Contributors
Thank you for your contributions! ❤

• @albe-rosado (aws-sdk-rust#641, smithy-rs#1892)