smithy-lang · hlbarber · Dec 2, 2022 · Oct 11, 2022 · Oct 11, 2022 · Oct 11, 2022
@@ -502,3 +502,108 @@ in non-serverless environments (e.g. via `hyper`).
 references = ["smithy-rs#2035"]
 meta = { "breaking" = true, "tada" = false, "bug" = false, "target" = "server" }
 author = "LukeMathWalker"
+
+[[smithy-rs]]
+message = """
+### Plugins/New Service Builder API
+
+The `Router` struct has been replaced by a new `Service` located at the root of the generated crate. Its name coincides with the same name as the Smithy service you are generating.
+
+```rust
+use pokemon_service_server_sdk::PokemonService;
+```
+
+The new service builder infrastructure comes with a `Plugin` system which supports middleware on `smithy-rs`. See the [mididleware documentation](https://github.com/awslabs/smithy-rs/blob/main/design/src/server/middleware.md) and the [API documentation](https://docs.rs/aws-smithy-http-server/latest/aws_smithy_http_server/plugin/index.html) for more details.
+
+Usage of the new service builder API:
+
+```rust
+// Apply a sequence of plugins using `PluginPipeline`.
+let plugins = PluginPipeline::new()
+ // Apply the `PrintPlugin`.
+ // This is a dummy plugin found in `rust-runtime/aws-smithy-http-server/examples/pokemon-service/src/plugin.rs`
+ .print()
+ // Apply the `InstrumentPlugin` plugin, which applies `tracing` instrumentation.
+ .instrument();
+
+// Construct the service builder using the `plugins` defined above.
+let app = PokemonService::builder_with_plugins(plugins)
+ // Assign all the handlers.
+ .get_pokemon_species(get_pokemon_species)
+ .get_storage(get_storage)
+ .get_server_statistics(get_server_statistics)
+ .capture_pokemon(capture_pokemon)
+ .do_nothing(do_nothing)
+ .check_health(check_health)
+ // Construct the `PokemonService`.
+ .build()
+ // If handlers are missing a descriptive error will be provided.
+ .expect("failed to build an instance of `PokemonService`");
+```
+
+See the `rust-runtime/aws-smithy-http-server/examples/pokemon-service/src/bin` folder for various working examples.
+
+### Public `FromParts` trait
+
+Previously, we only supported one [`Extension`](https://docs.rs/aws-smithy-http-server/latest/aws_smithy_http_server/request/struct.Extension.html) as an additional argument provided to the handler. This number has been increased to 8 and the argument type has been broadened to any struct which implements the [`FromParts`](https://docs.rs/aws-smithy-http-server/latest/aws_smithy_http_server/request/trait.FromParts.html) trait. The trait is publicly exported and therefore provides customers with the ability to extend the domain of the handlers.
+
+As noted, a ubiqutious example of a struct that implements `FromParts` is the `Extension` struct, which extracts state from the `Extensions` typemap of a [`http::Request`](https://docs.rs/http/latest/http/request/struct.Request.html). A new example is the `ConnectInfo` struct which allows handlers to access the connection data. See the `rust-runtime/aws-smithy-http-server/examples/pokemon-service/src/bin/pokemon-service-connect-info.rs` example.
+
+```rust
+fn get_pokemon_species(
+ input: GetPokemonSpeciesInput,
+ state: Extension<State>,
+ address: ConnectInfo<SocketAddr>
+) -> Result<GetPokemonSpeciesOutput, GetPokemonSpeciesError> {
+ todo!()
+}
+```
+
+In addition to the [`ConnectInfo`](https://docs.rs/aws-smithy-http-server/latest/aws_smithy_http_server/request/connect_info/struct.ConnectInfo.html) extractor, we also have added [lambda extractors](https://docs.rs/aws-smithy-http-server/latest/aws_smithy_http_server/request/lambda/index.html) which are feature gated with `aws-lambda`.
+
+[`FromParts` documentation](https://github.com/awslabs/smithy-rs/blob/main/design/src/server/from_parts.md) has been added.
+
+### New Documentation
+
+New sections to have been added to the [server side of the book](https://github.com/awslabs/smithy-rs/blob/main/design/src/server/overview.md).
+
+These include:
+
+- [Middleware](https://github.com/awslabs/smithy-rs/blob/main/design/src/server/middleware.md)
+- [Accessing Un-modelled Data](https://github.com/awslabs/smithy-rs/blob/main/design/src/server/from_parts.md)
+- [Anatomy of a Service](https://github.com/awslabs/smithy-rs/blob/main/design/src/server/anatomy.md)
+
+This release also introduces extensive documentation at the root of the generated crate. For best results compile documentation with `cargo +nightly doc --open`.
+
+### Deprecations
+
+The existing service builder infrastructure, `OperationRegistryBuilder`/`OperationRegistry`/`Router`, is now deprecated. Customers should migrate to the newer scheme described above. The deprecated types will be removed in a future release.
+"""
+references = [
+ "smithy-rs#1620",
+ "smithy-rs#1666",
+ "smithy-rs#1731",
+ "smithy-rs#1736",
+ "smithy-rs#1753",
+ "smithy-rs#1738",
+ "smithy-rs#1782",
+ "smithy-rs#1829",
+ "smithy-rs#1837",
+ "smithy-rs#1891",
+ "smithy-rs#1840",
+ "smithy-rs#1844",
+ "smithy-rs#1858",
+ "smithy-rs#1930",
+ "smithy-rs#1999",
+ "smithy-rs#2003",
+ "smithy-rs#2008",
+ "smithy-rs#2010",
+ "smithy-rs#2019",
+ "smithy-rs#2020",
+ "smithy-rs#2021",
+ "smithy-rs#2038",
+ "smithy-rs#2039",
+ "smithy-rs#2041",
+]
+meta = { "breaking" = true, "tada" = true, "bug" = false, "target" = "server" }
+author = "hlbarber"
@@ -424,6 +424,28 @@ sealed class Attribute {
  val NonExhaustive = Custom("non_exhaustive")
  }
 
+ data class Deprecated(val since: String?, val note: String?) : Attribute() {
+ override fun render(writer: RustWriter) {
+ writer.raw("#[deprecated")
+ if (since != null || note != null) {
+ writer.raw("(")
+ if (since != null) {
+ writer.raw("""since = "$since"""")
+
+ if (note != null) {
+ writer.raw(", ")
+ }
+ }
+
+ if (note != null) {
+ writer.raw("""note = "$note"""")
+ }
+ writer.raw(")")
+ }
+ writer.raw("]")
+ }
+ }
+
  data class Derives(val derives: Set<RuntimeType>) : Attribute() {
  override fun render(writer: RustWriter) {
  if (derives.isEmpty()) {

@@ -164,6 +164,7 @@ ${operationImplementationStubs(operations)}
  }
 
  private fun renderOperationRegistryStruct(writer: RustWriter) {
+ writer.rust("""##[deprecated(since = "0.52.0", note = "`OperationRegistry` is part of the deprecated service builder API. Use `$serviceName::builder` instead.")]""")
  writer.rustBlock("pub struct $operationRegistryNameWithArguments") {
  val members = operationNames
  .mapIndexed { i, operationName -> "$operationName: Op$i" }
@@ -182,6 +183,7 @@ ${operationImplementationStubs(operations)}
  * Renders the `OperationRegistryBuilder` structure, used to build the `OperationRegistry`.
  */
  private fun renderOperationRegistryBuilderStruct(writer: RustWriter) {
+ writer.rust("""##[deprecated(since = "0.52.0", note = "`OperationRegistryBuilder` is part of the deprecated service builder API. Use `$serviceName::builder` instead.")]""")
  writer.rustBlock("pub struct $operationRegistryBuilderNameWithArguments") {
  val members = operationNames
  .mapIndexed { i, operationName -> "$operationName: Option<Op$i>" }

@@ -23,6 +23,7 @@ import software.amazon.smithy.rust.codegen.core.smithy.InputsModule
 import software.amazon.smithy.rust.codegen.core.smithy.OutputsModule
 import software.amazon.smithy.rust.codegen.core.smithy.RustCrate
 import software.amazon.smithy.rust.codegen.core.smithy.generators.protocol.ProtocolSupport
+import software.amazon.smithy.rust.codegen.core.util.toPascalCase
 import software.amazon.smithy.rust.codegen.core.util.toSnakeCase
 import software.amazon.smithy.rust.codegen.server.smithy.ServerCargoDependency
 import software.amazon.smithy.rust.codegen.server.smithy.generators.protocol.ServerProtocol
@@ -69,8 +70,8 @@ open class ServerServiceGenerator(
  //!
  //! ## Using $serviceName
  //!
- //! The primary entrypoint is [`$serviceName`]: it satisfies the [`Service<http::Request, Response = http::Response>`]
- //! trait and therefore can be handed to a [`hyper` server] via [`$serviceName::into_make_service`] or used in Lambda via [`LambdaHandler`](#{SmithyHttpServer}::routing::LambdaHandler).
+ //! The primary entrypoint is [`$serviceName`]: it satisfies the [`Service<http::Request, Response = http::Response>`](#{Tower}::Service)
+ //! trait and therefore can be handed to a [`hyper` server](https://github.com/hyperium/hyper) via [`$serviceName::into_make_service`] or used in Lambda via [`LambdaHandler`](#{SmithyHttpServer}::routing::LambdaHandler).
  //! The [`crate::${InputsModule.name}`], ${if (!hasErrors) "and " else ""}[`crate::${OutputsModule.name}`], ${if (hasErrors) "and [`crate::${ErrorsModule.name}`]" else "" }
  //! modules provide the types used in each operation.
  //!
@@ -225,6 +226,7 @@ open class ServerServiceGenerator(
  "Handlers" to handlers,
  "ExampleHandler" to operations.take(1).map { operation -> DocHandlerGenerator(codegenContext, operation, builderFieldNames[operation]!!, "//!").docSignature() },
  "SmithyHttpServer" to ServerCargoDependency.SmithyHttpServer(codegenContext.runtimeConfig).toType(),
+ "Tower" to ServerCargoDependency.Tower.toType(),
  )
  }
 
@@ -236,7 +238,6 @@ open class ServerServiceGenerator(
  rustCrate.lib {
  documentation(this)
 
- rust("##[doc(inline, hidden)]")
  rust("pub use crate::service::{$serviceName, ${serviceName}Builder, MissingOperationsError};")
  }
 
@@ -255,35 +256,35 @@ open class ServerServiceGenerator(
  renderOperationHandler(this, operations)
  }
  rustCrate.withModule(
- RustModule.public(
+ RustModule.LeafModule(
  "operation_registry",
+ RustMetadata(
+ visibility = Visibility.PUBLIC,
+ additionalAttributes = listOf(
+ Attribute.Deprecated("0.52.0", "This module exports the deprecated `OperationRegistry`. Use the service builder exported from your root crate."),
+ ),
+ ),
  """
  Contains the [`operation_registry::OperationRegistry`], a place where
  you can register your service's operation implementations.
+
+ ## Deprecation
+
+ This service builder is deprecated - use [`${codegenContext.serviceShape.id.name.toPascalCase()}::builder_with_plugins`] or [`${codegenContext.serviceShape.id.name.toPascalCase()}::builder_without_plugins`] instead.
  """,
  ),
  ) {
  renderOperationRegistry(this, operations)
  }
 
- // TODO(https://github.com/awslabs/smithy-rs/issues/1707): Remove, this is temporary.
  rustCrate.withModule(
- RustModule.LeafModule(
- "operation_shape",
- RustMetadata(
- visibility = Visibility.PUBLIC,
- additionalAttributes = listOf(
- Attribute.DocHidden,
- ),
- ),
- ),
+ RustModule.public("operation_shape"),
  ) {
  ServerOperationShapeGenerator(operations, codegenContext).render(this)
  }
 
- // TODO(https://github.com/awslabs/smithy-rs/issues/1707): Remove, this is temporary.
  rustCrate.withModule(
- RustModule.LeafModule("service", RustMetadata(visibility = Visibility.PRIVATE, additionalAttributes = listOf(Attribute.DocHidden)), null),
+ RustModule.private("service"),
  ) {
  ServerServiceGeneratorV2(
  codegenContext,

@@ -379,6 +379,7 @@ class ServerServiceGeneratorV2(
  #{SmithyHttpServer}::routing::IntoMakeService::new(self)
  }
 
+
  /// Converts [`$serviceName`] into a [`MakeService`](tower::make::MakeService) with [`ConnectInfo`](#{SmithyHttpServer}::request::connect_info::ConnectInfo).
  pub fn into_make_service_with_connect_info<C>(self) -> #{SmithyHttpServer}::routing::IntoMakeServiceWithConnectInfo<Self, C> {
  #{SmithyHttpServer}::routing::IntoMakeServiceWithConnectInfo::new(self)
@@ -396,7 +397,7 @@ class ServerServiceGeneratorV2(
 
  /// Applies [`Route::new`](#{SmithyHttpServer}::routing::Route::new) to all routes.
  ///
- /// This has the effect of erasing all types accumulated via [`layer`].
+ /// This has the effect of erasing all types accumulated via [`layer`]($serviceName::layer).
  pub fn boxed<B>(self) -> $serviceName<#{SmithyHttpServer}::routing::Route<B>>
  where
  S: #{Tower}::Service<

@@ -15,10 +15,12 @@
  - [Backwards Compatibility](smithy/backwards-compat.md)
 
 - [Server](./server/overview.md)
- - [Generating Common Service Code](./server/code_generation.md)
- - [Generating the Pokémon Service](./server/pokemon_service.md)
- - [Instrumentation](./server/instrumentation.md)
- <!-- - [The Anatomy of a Service](./server/anatomy.md) -->
+ - [Middleware](./middleware.md)
+ - [Instrumentation](./instrumentation.md)
+ - [Accessing Un-modelled Data](./from_parts.md)
+ - [The Anatomy of a Service](./anatomy.md)
+ - [Generating Common Service Code](./code_generation.md)
+ - [Generating the Pokémon Service](./pokemon_service.md)
 
 - [RFCs](./rfcs/overview.md)
  - [RFC-0001: Sharing configuration between multiple clients](./rfcs/rfc0001_shared_config.md)

@@ -53,11 +53,19 @@ Smithy provides an out-the-box middleware which:
 - Opens a DEBUG level span, prior to request handling, including the operation name and request URI and headers.
 - Emits a DEBUG level event, after to request handling, including the response headers and status code.
 
-This is applied by default and can be enabled and disabled by filtering on `aws_smithy_http_server::instrumentation`.
+This is enabled via the `instrument` method provided by the `aws_smithy_http_server::instrumentation::InstrumentExt` trait.
 
-<!-- TODO: Link to it when the logging module is no longer `#[doc(hidden)]` -->
+```rust
+use aws_smithy_http_server::instrumentation::InstrumentExt;
 
-<!-- TODO: Document use of the `InstrumentExt` after the new service builder is released. -->
+let plugins = PluginPipeline::new().instrument();
+let app = PokemonService::builder_with_plugins(plugins)
+ .get_pokemon_species(/* handler */)
+ /* ... */
+ .build();
+```
+
+<!-- TODO: Link to it when the logging module is no longer `#[doc(hidden)]` -->
 
 ### Example
 

@@ -2,9 +2,9 @@
 
 Smithy Rust provides the ability to generate a server whose operations are provided by the customer.
 
+- [Middleware](./middleware.md)
+- [Instrumentation](./instrumentation.md)
+- [Accessing Un-modelled Data](./from_parts.md)
+- [The Anatomy of a Service](./anatomy.md)
 - [Generating Common Service Code](./code_generation.md)
 - [Generating the Pokémon Service](./pokemon_service.md)
-<!-- - [Middleware](./middleware.md) -->
-- [Instrumentation](./instrumentation.md)
-<!-- - [The Anatomy of a Service](./anatomy.md) -->
-<!-- - [Accessing Un-modelled Data](./from_parts.md) -->
@@ -70,10 +70,10 @@ async fn main() {
  .expect("failed to build an instance of PokemonService");
 
  // Start the [`hyper::Server`].
- let bind: std::net::SocketAddr = format!("{}:{}", args.address, args.port)
+ let bind: SocketAddr = format!("{}:{}", args.address, args.port)
  .parse()
  .expect("unable to parse the server bind address and port");
- let server = hyper::Server::bind(&bind).serve(app.into_make_service_with_connect_info::<std::net::SocketAddr>());
+ let server = hyper::Server::bind(&bind).serve(app.into_make_service_with_connect_info::<SocketAddr>());
 
  // Run forever-ish...
  if let Err(err) = server.await {

@@ -6,36 +6,50 @@
 // This program is exported as a binary named `pokemon-service-lambda`.
 use std::sync::Arc;
 
-use aws_smithy_http_server::{routing::LambdaHandler, AddExtensionLayer, Router};
+use aws_smithy_http_server::{
+ plugin::PluginPipeline, request::lambda::Context, routing::LambdaHandler, AddExtensionLayer, Extension,
+};
 use pokemon_service::{
- capture_pokemon, check_health, do_nothing, get_pokemon_species, get_server_statistics, get_storage, setup_tracing,
- State,
+ capture_pokemon, check_health, do_nothing, get_pokemon_species, get_server_statistics, plugin::PrintExt,
+ setup_tracing, State,
 };
-use pokemon_service_server_sdk::operation_registry::OperationRegistryBuilder;
+use pokemon_service_server_sdk::{error, input, output, PokemonService};
+
+/// Retrieves the user's storage and records the .
+pub async fn get_storage_lambda(
+ input: input::GetStorageInput,
+ _state: Extension<Arc<State>>,
+ context: Context,
+) -> Result<output::GetStorageOutput, error::GetStorageError> {
+ tracing::debug!(request_id = %context.request_id, "attempting to authenticate storage user");
+
+ // We currently only support Ash and he has nothing stored
+ if !(input.user == "ash" && input.passcode == "pikachu123") {
+ tracing::debug!("authentication failed");
+ return Err(error::GetStorageError::NotAuthorized(error::NotAuthorized {}));
+ }
+ Ok(output::GetStorageOutput { collection: vec![] })
+}
 
 #[tokio::main]
 pub async fn main() {
  setup_tracing();
-
- let app: Router = OperationRegistryBuilder::default()
+ // Apply the `PrintPlugin` defined in `plugin.rs`
+ let plugins = PluginPipeline::new().print();
+ let app = PokemonService::builder_with_plugins(plugins)
  // Build a registry containing implementations to all the operations in the service. These
  // are async functions or async closures that take as input the operation's input and
  // return the operation's output.
  .get_pokemon_species(get_pokemon_species)
- .get_storage(get_storage)
+ .get_storage(get_storage_lambda)
  .get_server_statistics(get_server_statistics)
  .capture_pokemon(capture_pokemon)
  .do_nothing(do_nothing)
  .check_health(check_health)
  .build()
- .expect("Unable to build operation registry")
- // Convert it into a router that will route requests to the matching operation
- // implementation.
- .into();
-
- // Setup shared state and middlewares.
- let shared_state = Arc::new(State::default());
- let app = app.layer(AddExtensionLayer::new(shared_state));
+ .expect("failed to build an instance of PokemonService")
+ // Set up shared state and middlewares.
+ .layer(&AddExtensionLayer::new(Arc::new(State::default())));
 
  let handler = LambdaHandler::new(app);
  let lambda = lambda_http::run(handler);