Smithy Go

Smithy code generators for Go and the accompanying smithy-go runtime.

The smithy-go runtime requires a minimum version of Go 1.24.

WARNING: All interfaces are subject to change.

⚠️ Client codegen is unstable

The client code generator in this repository powers the aws-sdk-go-v2. Arbitrary client generation, while technically possible, is in an early stage of development:

• Generated clients are missing certain features that were originally implemented SDK-side (e.g. retries)
• There may be bugs
• The public APIs of generated clients may be unstable

If you are interested in using the client code generators, we encourage you to experiment and share any feedback with us in an issue.

Plugins

This repository implements the following Smithy build plugins:

ID	GAV prefix	Description
go-codegen	software.amazon.smithy.go:smithy-go-codegen	Implements Go client code generation for Smithy models.
go-server-codegen	software.amazon.smithy.go:smithy-go-codegen	Implements Go server code generation for Smithy models.
go-shape-codegen	software.amazon.smithy.go:smithy-go-codegen	Implements Go shape code generation (types only) for Smithy models.

NOTE: Build plugins are not currently published to mavenCentral. You must publish to mavenLocal to make the build plugins visible to the Smithy CLI. The artifact version is currently fixed at 0.1.0.

go-codegen

Configuration

GoSettings contains all of the settings enabled from smithy-build.json and helper methods and types. The up-to-date list of top-level properties enabled for go-client-codegen can be found in GoSettings::from().

Setting	Type	Required	Description
service	string	yes	The Shape ID of the service for which to generate the client.
module	string	yes	Name of the module in generated.json (and go.mod if generateGoMod is enabled) and doc.go.
generateGoMod	boolean		Whether to generate a default go.mod file. The default value is false.
goDirective	string		Go directive of the module. The default value is the minimum supported Go version.

Supported protocols

The protocol a client uses is configured by the Protocol field on a client's Options. The SDK will configure a default based on the protocol traits applied to the modeled service.

Protocol	Notes
smithy.protocols#rpcv2Cbor
aws.protocols#restJson1
aws.protocols#restXml
aws.protocols#awsJson1_0
aws.protocols#awsJson1_1
aws.protocols#awsQuery
aws.protocols#ec2Query

Example

This example applies the go-codegen build plugin to the Smithy quickstart example created from smithy init:

{
  "version": "1.0",
  "sources": [
    "models"
  ],
  "maven": {
    "dependencies": [
      "software.amazon.smithy.go:smithy-go-codegen:0.1.0"
    ]
  },
  "plugins": {
    "go-codegen": {
      "service": "example.weather#Weather",
      "module": "github.com/example/weather",
      "generateGoMod": true,
      "goDirective": "1.24"
    }
  }
}

go-server-codegen

This plugin is a work-in-progress and is currently undocumented.

go-shape-codegen

This plugin is a work-in-progress and is currently undocumented.

License

This project is licensed under the Apache-2.0 License.