go get github.com/goadesign/goa
go get github.com/goadesign/goa/goagen

go install github.com/goadesign/goa
go install github.com/goadesign/goa/goagen

qingping.zhang@qpzhangmac ~/dev goagen --help
The goagen tool generates artifacts from a goa service design package.

Each command supported by the tool produces a specific type of artifacts. For example
the "app" command generates the code that supports the service controllers.

The "bootstrap" command runs the "app", "main", "client" and "swagger" commands generating the
controllers supporting code and main skeleton code (if not already present) as well as a client
package and tool and the Swagger specification for the API.

Usage:
  goagen [command]

Available Commands:
  app         Generate application code
  main        Generate application scaffolding
  client      Generate client package and tool
  swagger     Generate Swagger
  js          Generate JavaScript client
  schema      Generate JSON Schema
  gen         Run third-party generator
  bootstrap   Equivalent to running the "app", "main", "client" and "swagger" commands.

Flags:
      --debug           enable debug mode, does not cleanup temporary files.
  -d, --design string   design package import path
  -o, --out string      output directory (default "/Users/qingpingzhang/dev")

Use "goagen [command] --help" for more information about a command.

go get gopkg.in/yaml.v2

//design.go

package design                                     // The convention consists of naming the design
                                                   // package "design"
import (
        . "github.com/goadesign/goa/design"        // Use . imports to enable the DSL
        . "github.com/goadesign/goa/design/apidsl"
)

var _ = API("cellar", func() {                     // API defines the microservice endpoint and
        Title("The virtual wine cellar")           // other global properties. There should be one
        Description("A simple goa service")        // and exactly one API definition appearing in
        Scheme("http")                             // the design.
        Host("localhost:8080")
})

var _ = Resource("bottle", func() {                // Resources group related API endpoints
        BasePath("/bottles")                       // together. They map to REST resources for REST
        DefaultMedia(BottleMedia)                  // services.

        Action("show", func() {                    // Actions define a single API endpoint together
                Description("Get bottle by id")    // with its path, parameters (both path
                Routing(GET("/:bottleID"))         // parameters and querystring values) and payload
                Params(func() {                    // (shape of the request body).
                        Param("bottleID", Integer, "Bottle ID")
                })
                Response(OK)                       // Responses define the shape and status code
                Response(NotFound)                 // of HTTP responses.
        })
})

// BottleMedia defines the media type used to render bottles.
var BottleMedia = MediaType("application/vnd.goa.example.bottle+json", func() {
        Description("A bottle of wine")
        Attributes(func() {                         // Attributes define the media type shape.
                Attribute("id", Integer, "Unique bottle ID")
                Attribute("href", String, "API href for making requests on the bottle")
                Attribute("name", String, "Name of wine")
                Required("id", "href", "name")
        })
        View("default", func() {                    // View defines a rendering of the media type.
                Attribute("id")                     // Media types may have multiple views and must
                Attribute("href")                   // have a "default" view.
                Attribute("name")
        })
})

 qingping.zhang@qpzhangmac ~/gocode/src/goa.demo/  goagen bootstrap -d goa.demo/design
app
app/contexts.go
app/controllers.go
app/hrefs.go
app/media_types.go
app/user_types.go
app/test
app/test/bottle.go
main.go
bottle.go
client
client/cellar-cli
client/cellar-cli/main.go
client/cellar-cli/commands.go
client/client.go
client/bottle.go
client/datatypes.go
swagger
swagger/swagger.json
swagger/swagger.yaml

 qingping.zhang@qpzhangmac ~/gocode/src/goa.demo go build

 qingping.zhang@qpzhangmac ~/gocode/src/goa.demo ./goa.demo
2016/05/26 15:45:09 [INFO] mount ctrl=Bottle action=Show route=GET /bottles/:bottleID
2016/05/26 15:45:09 [INFO] listen transport=http addr=:8080

2016/05/26 15:46:21 [INFO] started req_id=qAWO65SPCG-1 GET=/bottles/1 from=127.0.0.1 ctrl=BottleController action=Show
2016/05/26 15:46:21 [INFO] params req_id=qAWO65SPCG-1 bottleID=1

 qingping.zhang@qpzhangmac  ~  curl -i localhost:8080/bottles/1
HTTP/1.1 200 OK
Content-Type: application/vnd.goa.example.bottle
Date: Thu, 26 May 2016 07:07:40 GMT
Content-Length: 29

{"href":"","id":0,"name":""}