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restful-user-service.go
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restful-user-service.go
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package main
import (
"appengine"
"appengine/memcache"
"github.com/emicklei/go-restful"
"github.com/emicklei/go-restful/swagger"
"net/http"
)
// This example is functionally the same as ../restful-user-service.go
// but it`s supposed to run on Goole App Engine (GAE)
//
// contributed by ivanhawkes
type User struct {
Id, Name string
}
type UserService struct {
// normally one would use DAO (data access object)
// but in this example we simple use memcache.
}
func (u UserService) Register() {
ws := new(restful.WebService)
ws.
Path("/users").
Consumes(restful.MIME_XML, restful.MIME_JSON).
Produces(restful.MIME_JSON, restful.MIME_XML) // you can specify this per route as well
ws.Route(ws.GET("/{user-id}").To(u.findUser).
// docs
Doc("get a user").
Param(ws.PathParameter("user-id", "identifier of the user").DataType("string")).
Writes(User{})) // on the response
ws.Route(ws.PATCH("").To(u.updateUser).
// docs
Doc("update a user").
Reads(User{})) // from the request
ws.Route(ws.PUT("/{user-id}").To(u.createUser).
// docs
Doc("create a user").
Param(ws.PathParameter("user-id", "identifier of the user").DataType("string")).
Reads(User{})) // from the request
ws.Route(ws.DELETE("/{user-id}").To(u.removeUser).
// docs
Doc("delete a user").
Param(ws.PathParameter("user-id", "identifier of the user").DataType("string")))
restful.Add(ws)
}
// GET http://localhost:8080/users/1
//
func (u UserService) findUser(request *restful.Request, response *restful.Response) {
c := appengine.NewContext(request.Request)
id := request.PathParameter("user-id")
usr := new(User)
_, err := memcache.Gob.Get(c, id, &usr)
if err != nil || len(usr.Id) == 0 {
response.WriteErrorString(http.StatusNotFound, "User could not be found.")
} else {
response.WriteEntity(usr)
}
}
// PATCH http://localhost:8080/users
// <User><Id>1</Id><Name>Melissa Raspberry</Name></User>
//
func (u *UserService) updateUser(request *restful.Request, response *restful.Response) {
c := appengine.NewContext(request.Request)
usr := new(User)
err := request.ReadEntity(&usr)
if err == nil {
item := &memcache.Item{
Key: usr.Id,
Object: &usr,
}
err = memcache.Gob.Set(c, item)
if err != nil {
response.WriteError(http.StatusInternalServerError, err)
return
}
response.WriteEntity(usr)
} else {
response.WriteError(http.StatusInternalServerError, err)
}
}
// PUT http://localhost:8080/users/1
// <User><Id>1</Id><Name>Melissa</Name></User>
//
func (u *UserService) createUser(request *restful.Request, response *restful.Response) {
c := appengine.NewContext(request.Request)
usr := User{Id: request.PathParameter("user-id")}
err := request.ReadEntity(&usr)
if err == nil {
item := &memcache.Item{
Key: usr.Id,
Object: &usr,
}
err = memcache.Gob.Add(c, item)
if err != nil {
response.WriteError(http.StatusInternalServerError, err)
return
}
response.WriteHeader(http.StatusCreated)
response.WriteEntity(usr)
} else {
response.WriteError(http.StatusInternalServerError, err)
}
}
// DELETE http://localhost:8080/users/1
//
func (u *UserService) removeUser(request *restful.Request, response *restful.Response) {
c := appengine.NewContext(request.Request)
id := request.PathParameter("user-id")
err := memcache.Delete(c, id)
if err != nil {
response.WriteError(http.StatusInternalServerError, err)
}
}
func getGaeURL() string {
if appengine.IsDevAppServer() {
return "http://localhost:8080"
} else {
/**
* Include your URL on App Engine here.
* I found no way to get AppID without appengine.Context and this always
* based on a http.Request.
*/
return "http://<your_app_id>.appspot.com"
}
}
func init() {
u := UserService{}
u.Register()
// Optionally, you can install the Swagger Service which provides a nice Web UI on your REST API
// You need to download the Swagger HTML5 assets and change the FilePath location in the config below.
// Open <your_app_id>.appspot.com/apidocs and enter http://<your_app_id>.appspot.com/apidocs.json in the api input field.
config := swagger.Config{
WebServices: restful.RegisteredWebServices(), // you control what services are visible
WebServicesUrl: getGaeURL(),
ApiPath: "/apidocs.json",
// Optionally, specifiy where the UI is located
SwaggerPath: "/apidocs/",
// GAE support static content which is configured in your app.yaml.
// This example expect the swagger-ui in static/swagger so you should place it there :)
SwaggerFilePath: "static/swagger"}
swagger.InstallSwaggerService(config)
}