October 31st, 2023

Breaking Changes:

• ⚠️🎉 (client, smithy-rs#2417, smithy-rs#3018) Retry classifiers are now configurable at the service and operation levels. Users may also define their own custom retry classifiers.

  For more information, see the guide.

• ⚠️ (client, smithy-rs#3011) HTTP connector configuration has changed significantly. See the upgrade guidance for details.

• ⚠️ (client, smithy-rs#3038) The enableNewSmithyRuntime: middleware opt-out flag in smithy-build.json has been removed and no longer opts out of the client orchestrator implementation. Middleware is no longer supported. If you haven't already upgraded to the orchestrator, see the guide.

• ⚠️ (client, smithy-rs#2909) It's now possible to nest runtime components with the RuntimePlugin trait. A current_components argument was added to the runtime_components method so that components configured from previous runtime plugins can be referenced in the current runtime plugin. Ordering of runtime plugins was also introduced via a new RuntimePlugin::order method.

• ⚠️ (all, smithy-rs#2948) Update MSRV to Rust 1.70.0

• ⚠️ (client, smithy-rs#2970) aws_smithy_client::hyper_ext::Adapter was moved/renamed to aws_smithy_runtime::client::connectors::hyper_connector::HyperConnector.

• ⚠️ (client, smithy-rs#2970) Test connectors moved into aws_smithy_runtime::client::connectors::test_util behind the test-util feature.

• ⚠️ (client, smithy-rs#2970) DVR's RecordingConnection and ReplayingConnection were renamed to RecordingConnector and ReplayingConnector respectively.

• ⚠️ (client, smithy-rs#2970) TestConnection was renamed to EventConnector.

• ⚠️ (all, smithy-rs#2973) Remove once_cell from public API.

• ⚠️ (all, smithy-rs#2995) Structure members with the type Option<Vec<T>> now produce an accessor with the type &[T] instead of Option<&[T]>. This is enabled by default for clients and can be disabled by updating your smithy-build.json with the following setting:

  {
    "codegen": {
      "flattenCollectionAccessors": false,
      ...
    }
  }

• ⚠️ (client, smithy-rs#2978) The futures_core::stream::Stream trait has been removed from public API. FnStream only supports next, try_next, collect, and try_collect methods. TryFlatMap::flat_map returns PaginationStream, which should be preferred to FnStream at an interface level. Other stream operations that were previously available through the trait or its extension traits can be added later in a backward compatible manner. Finally, fn_stream has been moved to be a child module of pagination_stream.

• ⚠️ (client, smithy-rs#2983) The futures_core::stream::Stream trait has been removed from ByteStream. The methods mentioned in the doc will continue to be supported. Other stream operations that were previously available through the trait or its extension traits can be added later in a backward compatible manner.

• ⚠️ (client, smithy-rs#2997) StaticUriEndpointResolver's uri constructor now takes a String instead of a Uri.

• ⚠️ (server, smithy-rs#3038) SdkError is no longer re-exported in generated server crates.

• ⚠️ (client, smithy-rs#3039) The customize() method is now sync and infallible. Remove any awaits and error handling from it to make things compile again.

• 🐛⚠️ (all, smithy-rs#3037, aws-sdk-rust#756) Our algorithm for converting identifiers to snake_case has been updated. This may result in a small change for some identifiers, particularly acronyms ending in s, e.g. ACLs.

• ⚠️ (client, smithy-rs#3055) The future return types on traits EndpointResolver and IdentityResolver changed to new-types EndpointFuture and IdentityFuture respectively.

• ⚠️ (client, smithy-rs#3032) EndpointPrefix::new no longer returns crate::operation::error::BuildError for an Err variant, instead returns a more specific InvalidEndpointError.

• ⚠️ (client, smithy-rs#3061) Lifetimes have been added to the EndpointResolver trait.

• ⚠️ (client, smithy-rs#3065) Several traits have been renamed from noun form to verb form to be more idiomatic:

  • AuthSchemeOptionResolver -> ResolveAuthSchemeOptions
  • EndpointResolver -> ResolveEndpoint
  • IdentityResolver -> ResolveIdentity
  • Signer -> Sign
  • RequestSerializer -> SerializeRequest
  • ResponseDeserializer -> DeserializeResponse
  • Interceptor -> Intercept

• ⚠️ (client, smithy-rs#3059) This change has detailed upgrade guidance. A summary is below.
  
  The HttpRequest type alias now points to aws-smithy-runtime-api::client::http::Request. This is a first-party request type to allow us to gracefully support http = 1.0 when it arrives. Most customer code using this method should be unaffected. TryFrom/TryInto conversions are provided for http = 0.2.*.

• ⚠️ (client, smithy-rs#2917) RuntimeComponents have been added as an argument to the IdentityResolver::resolve_identity trait function.

• ⚠️ (client, smithy-rs#3072) The idempotency_provider field has been removed from config as a public field. If you need access to this field, it is still available from the context of an interceptor.

• ⚠️ (client, smithy-rs#3078) The config::Builder::endpoint_resolver method no longer accepts &'static str. Use config::Builder::endpoint_url instead.

• ⚠️ (client, smithy-rs#3043, smithy-rs#3078) This change has detailed upgrade guidance.
  
  The endpoint interfaces from aws-smithy-http have been removed. Service-specific endpoint resolver traits have been added.

• ⚠️ (all, smithy-rs#3054, smithy-rs#3070) aws_smithy_http::operation::error::{BuildError, SerializationError} have been moved to aws_smithy_types::error::operation::{BuildError, SerializationError}. Type aliases for them are left in aws_smithy_http for backwards compatibility but are deprecated.

• ⚠️ (all, smithy-rs#3076) aws_smithy_http::body::{BoxBody, Error, SdkBody} have been moved to aws_smithy_types::body::{BoxBody, Error, SdkBody}. Type aliases for them are left in aws_smithy_http for backwards compatibility but are deprecated.

• ⚠️ (all, smithy-rs#3076, smithy-rs#3091) aws_smithy_http::byte_stream::{AggregatedBytes, ByteStream, error::Error, FsBuilder, Length} have been moved to aws_smithy_types::byte_stream::{AggregatedBytes, ByteStream, error::Error, FsBuilder, Length}. Type aliases for them are left in aws_smithy_http for backwards compatibility but are deprecated.

• ⚠️ (client, smithy-rs#3077) Behavior Break! Identities for auth are now cached by default. See the Config builder's identity_cache() method docs for an example of how to disable this caching.

• ⚠️ (all, smithy-rs#3033, smithy-rs#3088, smithy-rs#3101) Publicly exposed types from http-body and hyper crates within aws-smithy-types are now feature-gated. See the upgrade guidance for details.

• ⚠️ (all, smithy-rs#3033, smithy-rs#3088) ByteStream::poll_next is now feature-gated. You can turn on a cargo feature byte-stream-poll-next in aws-smithy-types to use it.

• ⚠️ (client, smithy-rs#3092, smithy-rs#3093) The connection and result modules in aws-smithy-http have been moved to aws-smithy-runtime-api. Type aliases for all affected pub items, except for a trait, are left in aws-smithy-http for backwards compatibility but are deprecated. Due to lack of trait aliases, the moved trait CreateUnhandledError needs to be used from aws-smithy-runtime-api.

• 🐛⚠️ (server, smithy-rs#3095, smithy-rs#3096) Service builder initialization now takes in a ${serviceName}Config object on which plugins and layers should be registered. The builder_with_plugins and builder_without_plugins methods on the service builder, as well as the layer method on the built service have been deprecated, and will be removed in a future release. See the upgrade guidance for more details.

New this release:

• 🎉 (client, smithy-rs#2916, smithy-rs#1767) Support for Smithy IDLv2 nullability is now enabled by default. You can maintain the old behavior by setting `nullabilityCheckMode: "CLIENT_ZERO_VALUE_V1" in your codegen config.
  For upgrade guidance and more info, see here.
• 🎉 (server, smithy-rs#3005) Python middleware can set URI. This can be used to route a request to a different handler.
• 🎉 (client, smithy-rs#3071) Clients now have a default async sleep implementation so that one does not need to be specified if you're using Tokio.
• 🐛 (client, smithy-rs#2944, smithy-rs#2951) CustomizableOperation, created as a result of calling the .customize method on a fluent builder, ceased to be Send and Sync in the previous releases. It is now Send and Sync again.
• 🐛 (client, smithy-rs#2960) Generate a region setter when a model uses SigV4.
• 🐛 (all, smithy-rs#2969, smithy-rs#1896) Fix code generation for union members with the @httpPayload trait.
• (client, smithy-rs#2964) Required members with @contextParam are now treated as client-side required.
• 🐛 (client, smithy-rs#2926, smithy-rs#2972) Fix regression with redacting sensitive HTTP response bodies.
• 🐛 (all, smithy-rs#2831, aws-sdk-rust#818) Omit fractional seconds from http-date format.
• 🐛 (client, smithy-rs#2985) Source defaults from the default trait instead of implicitly based on type. This has minimal changes in the generated code.
• (client, smithy-rs#2996) Produce better docs when items are marked @required
• 🐛 (client, smithy-rs#3034, smithy-rs#3087) Enable custom auth schemes to work by changing the code generated auth options to be set at the client level at DEFAULTS priority.