wvlet / sbt-airframe

A sbt plugin for generating Airframe RPC clients and OpenAPI spec

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sbt-airframe plugin

A sbt plugin for generating Airframe RPC clients

sbt-airframe plugins supports generating HTTP clients for making RPC calls. sbt-airframe supports generating async, sync, or Scala.js HTTP clients.

maven central

Add the following plugin settings:


addSbtPlugin("org.wvlet.airframe" % "sbt-airframe" % "(version)")

To generate HTTP clients, add airframeHttpClients setting to your build.sbt. You need to specify which API package to use for generating RPC clients. The format is <RPC package name>:<client type>(:<target package name>)?. For example:



airframeHttpClients := Seq("hello.api.v1:sync")

// [optional] Specify airframe-http version to use
aifframeHttpVersion := (AIRFRAME_VERSION)

Supported client types are:

  • sync: Create a sync HTTP client (ServiceSyncClient) for Scala (JVM)
  • async: Create an async HTTP client (ServiceClient) for Scala (JVM) using Future abstraction (F). The F can be scala.concurrent.Future or twitter-util's Future.
  • scalajs: Create an RPC client (ServiceClientJS)
  • grpc: Create gRPC client stubs (ServiceGrpc: SyncClient, AsyncClient)

To support other types of clients, see the examples of HTTP code generators . This code reads a Router definition of RPC interfaces, and generate client code for calling RPC endpoints. Currently, we only supports generating HTTP clients for Scala. In near future, we would like to add Open API spec generator so that many programming languages can be used with Airframe RPC.

The generated client code can be found in target/scala-2.12/src_managed/(api package)/ folder.

sbt-airframe commands

# Regenerate the generated client code.Use this if RPC interface has changed
> airframeHttpReload

# Generating RPC clients manually
> airframeHttpGenerateClients

# Clean the generated code
> airframeHttpClean

Open API

sbt-airframe plugin also supports generating Open API specification from Airframe RPC interfaces. To generate OpenAPI spec from RPC definition, add airframeHttpOpenAPIPackages configuration to your build.sbt:

// [Required] RPC packages to use for generating Open API specification
airframeHttpOpenAPIPackages := Seq("hello.api")
// [Optional] Specify target directory to generate openapi.yaml. The default is target directory
airframeHttpOpenAPITargetDir := target.value
// [Optional] Additional configurations (e.g., title, version, etc.)
airframeHttpOpenAPIConfig := OpenAPIConfig(
  title = "My API", // default is project name
  version = "1.0.0", // default is project version,
  format = "yaml", // yaml (default) or json
  filePrefix = "openapi" // Output file name: (filePrefix).(format)

With this configuration, Open API spec will be generated when running package task:

> package

It will generate target/openapi.yaml file.