package designimport (. "github.com/goadesign/goa/design". "github.com/goadesign/goa/design/apidsl"
)var _ = API("adder", func() {Title("The adder API")Description("A teaser for goa")Host("localhost:8080")Scheme("http")
})var _ = Resource("operands", func() {Action("add", func() {Routing(GET("add/:left/:right"))Description("add returns the sum of the left and right parameters in the response body")Params(func() {Param("left", Integer, "Left operand")Param("right", Integer, "Right operand")})Response(OK, "text/plain")})})

qpzhang@qpzhang:~/gocode/src/goa-adder $tree
.
├── app
│   ├── contexts.go
│   ├── controllers.go
│   ├── hrefs.go
│   ├── media_types.go
│   ├── test
│   │   └── operands.go
│   └── user_types.go
├── client
│   ├── adder-cli
│   │   ├── commands.go
│   │   └── main.go
│   ├── client.go
│   ├── datatypes.go
│   └── operands.go
├── design
│   └── design.go
├── main.go
├── operands.go
└── swagger├── swagger.json└── swagger.yaml

//operands.gopackage mainimport ("github.com/goadesign/goa""goa-adder/app"
)// OperandsController implements the operands resource.
type OperandsController struct {*goa.Controller
}// NewOperandsController creates a operands controller.
func NewOperandsController(service *goa.Service) *OperandsController {return &OperandsController{Controller: service.NewController("OperandsController")}
}// Add runs the add action.
func (c *OperandsController) Add(ctx *app.AddOperandsContext) error {// TBD: implement   在这里写对应的函数逻辑return nil
}

//使用命令
goagen --debug bootstrap -d goa-adder/design//生成目录
qpzhang@qpzhang:~/gocode/src/goa-adder $tree -L 1
.
├── app
├── client
├── design
├── goagen009966755
├── goagen174102868
├── goagen511141286
├── goagen585483469
├── main.go
├── operands.go
└── swagger

├── goagen009966755
│   ├── goagen
│   └── main.go
├── goagen174102868
│   ├── goagen
│   └── main.go
├── goagen511141286
│   ├── goagen
│   └── main.go
├── goagen585483469
│   ├── goagen
│   └── main.go

//************************************************************************//
// Code Generator
//
// Generated with goagen v0.0.1, command line:
// $ goagen
// --debug bootstrap -d goa-adder/design
//
// The content of this file is auto-generated, DO NOT MODIFY
//************************************************************************//package mainimport ("github.com/goadesign/goa/goagen/gen_main""fmt""strings"
    "github.com/goadesign/goa/dslengine"_ "goa-adder/design"
)func main() {// Check if there were errors while running the first DSL passdslengine.FailOnError(dslengine.Errors)// Now run the secondary DSLsdslengine.FailOnError(dslengine.Run()) files, err := genmain.Generate()dslengine.FailOnError(err)// We're donefmt.Println(strings.Join(files, "\n"))
}

package designimport (. "github.com/goadesign/goa/design". "github.com/goadesign/goa/design/apidsl"
)var _ = API("adder", func() {Title("The adder API")Description("A teaser for goa")Host("localhost:8080")Scheme("http")
})

func API(name string, dsl func()) *design.APIDefinition {if design.Design.Name != "" {dslengine.ReportError("multiple API definitions, only one is allowed")return nil}if !dslengine.IsTopLevelDefinition() {dslengine.IncompatibleDSL()return nil}if name == "" {dslengine.ReportError("API name cannot be empty")} design.Design.Name = namedesign.Design.DSLFunc = dslreturn design.Design
}

//main.gopackage mainimport "fmt"//定义DSL语言描述的结构体,用于保存DSL里面的数据
type APIDefinition struct {// Name of APIName string// Title of APITitle string// Description of APIDesc string// DSLFunc contains the DSL used to create this definition if anyDSLFunc func()
}//实现DSL对应的API,用于实例化
func API(name string, dsl func()) *APIDefinition {api := new(APIDefinition)api.Name = nameapi.DSLFunc = dsl//偷偷赋值g_api = apireturn api
}//对应的Title赋值
func Title(val string) {if g_api != nil {g_api.Title = val}
}func Description(d string) {if g_api != nil {g_api.Desc = d}
}//当前design的实例,这里用全局变量示意
var g_api *APIDefinition//根据内存中的存储数据来进行代码生成
func generateTest() {//这里需要执行一下对应的DSLFuncg_api.DSLFunc()fmt.Println("get Name: ", g_api.Name)fmt.Println("get Title: ", g_api.Title)fmt.Println("get Desc: ", g_api.Desc)
}//这里是DSL申明
var _ = API("adder", func() {Title("The adder API")Description("A teaser for goa")
})func main() {generateTest()
}

qpzhang@qpzhang:~/gocode/auto-gen $go run main.go
get Name:  adder
get Title:  The adder API
get Desc:  A teaser for goa