goa Design first API Generation

Mar 13, 2017Download as PPTX, PDF2 likes2,692 views

goa is a Go library for designing and implementing REST microservices. It includes a DSL for describing APIs, a code generation tool called goagen, and runtime support libraries. goagen takes the API description and generates Go code including a controller scaffold, validation logic, documentation, and more. The generated code is organized across multiple packages for clear separation of concerns between the auto-generated and custom code.

CyberAgent, Inc. All Rights Reserved.
goa :: Design-first API Generation
2015 December 4th
Date : 2017 March 10 Presenter : Y.Sugiyama

Introduction Who are you?01
CyberAgent(2011~)
• Ameba Pigg
• Java, node.js, MongoDB
• Takusuta(Live Streaming)
• Golang(gin), node.js, python, MongoDB,and various on live streaming.
• Golang, node.js, a little Scala.
Yoshinori Sugiyama,age:36,github:syama666

goa has three parts What is goa?02
• a Go DSL for describing the microservice API
• a tool for generating code and documentation from design DSL
• a library to support the implementation of microservices

$DSL examples for API design design03 // GET /v1/kings?page=1&perPage=10&sort=-kingsId var _ = Resource("v1_kings", func() { BasePath("/v1/kings") Action("list", func() { Routing(GET("")) Description(”get kings list") Param("page", Integer, "e.g.) page=1", func() { Default(1) }) Param("perPage", Integer, "e.g.) perPage=10", func() { Default(10) }) Param("sort", String, "e.g.) sort=kingId or sort=- kingId", func() { Pattern("^-?[0-9a-zA-Z]+$") Default("-kingId") }) Response(OK, func() { Media(ResponseKings) })$

$DSL examples for API design design03 // PUT/v1/kings/1192 var _ = Resource("v1_kings", func() { BasePath("/v1/kings") Action("update", func () { Routing(PUT("/:kingId")) Description(”update a king") Params(func() { Param("kingId", Integer) }) Payload(UpdateKing) Response(OK, func() { Media(ResponseOneKing) }) })$

DSL examples for API design design03
// base king type dsl
var baseKing = Type("baseKing", func() {
Attribute("kingId", Integer, func() {
Example(1192)
})
Attribute("name", String, func() {
Example("Louis XIV")
})
Attribute("age", Integer, func() {
Example(76)
})
})

DSL examples for API design design03
// Japanese Lord type dsl
var japaneseLord = Type("baseKing", func() {
Reference(baseKing)
Attribute("kingId")
Attribute("name")
Attribute("age")
Attribute("birthPlace", String, func(){
Example(“江戸”)
})
Required(
"kingId",
"name",
"age",
"birthPlace",
)
})

DSL to Swagger design03
Goa DSL to Swagger.json By goagen

goagen’s sub commands Generating04
• main
• main.go and controller scaffolding
• controller
• only controller scaffolding
• app
• validation, context, etc
• client
• golang client
• swagger
• swagger json
• js
• javascript client
• schema
• JSON schema

directory/package structure Generating04
• main.go
• controller/
• gen/
• app/
• contexts.go
• controllers.go
• hrefs.go
• user_types.go
• media_types.go
• swagger/
• swagger.json
• swagger.yml
• design/

lib,generated, and yours Overall view
05

cool digest06
• Generating swagger docs.
• Generating validation-code, and scaffolding some.
• Output a better code than go-swagger -> https://github.com/go-
swagger/go-swagger

not cool digest06
• You need implements logic of convert from your model sturct to goa-
generated struct.
• If you want to customize the error response, you have to hack goa -
middleware.
https://github.com/goadesign/goa/issues/1076

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