I am quite new to go and try to learn, I am setting up an application with a gin-gonic server. I managed to have it to work with everything in on main package, I would like to organize it better with all the apirest related in a package (which I manage) AND to split each group CRUD by file.
so in the "main" file of the package within the init function, I defined :
Router := gin.New()
Router.Use(gin.Logger())
Router.Use(gin.Recovery())
and I though that I would be able in each other files of the package to use it like that :
v1 := Router.Group("/api/v1/todos")
v1.Use(AuthRequired())
{
v1.POST("/", CreateTodo)
v1.GET("/", FetchAllTodo)
v1.GET("/:id", FetchSingleTodo)
v1.PUT("/:id", UpdateTodo)
v1.DELETE("/:id", DeleteTodo)
}
or
packagename.Router.Group
but none are working and I get :
undefined: Router in Router.Group
Stéphane PS : I did setup a sub folder for the package and I am able to go build it if it's in one file.
I though that the solution was to declare the Router variable as *gin.Engine but while it's compiling fine, I get a panic error on the Router.Group call
let me post some more part of code :
maincode.go :
package main
import (
"fmt"
"./apirest"
"github.com/braintree/manners"
)
func main(){
fmt.Printf("hello world.\n")
//router.Run()
manners.ListenAndServe(":8080", apirest.Router)
}
Then I split the apirest package in 2 files :
apirest.go (I did manually cleanup, maybee I missed an import) :
package apirest
import (
"fmt"
"github.com/gin-gonic/gin"
"github.com/braintree/manners"
"os"
"os/signal"
)
//Router pour gérer l'api
var Router *gin.Engine
/*
MAIN FUNCTION
*/
func init() {
Router := gin.New()
Router.Use(gin.Logger())
Router.Use(gin.Recovery())
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func(){
for sig := range c {
// sig is a ^C, handle it
fmt.Printf("ctl+c catched "+sig.String())
manners.Close()
}
}()
LoadMonitor()
}
and then the todoCRUD.go file that handle all the declaration, the todoCRUD.go and apirest.go are in the same subfolder apirest (and compile ok) :
package apirest
import (
"fmt"
"github.com/gin-gonic/gin"
"gopkg.in/validator.v2"
"github.com/jinzhu/gorm"
"strconv"
"net/http"
"time"
)
//Todo definition d'un element todo
type Todo struct {
gorm.Model
CreatedAt time.Time
UpdatedAt time.Time
OwnerID int `json:"ownerid" validate:"nonzero"`
URL string `json:"url"`
}
//TransformedTodo version pour le retour d'api sans certaines infos
type TransformedTodo struct {
ID uint `json:"id"`
CreatedAt time.Time
UpdatedAt time.Time
OwnerID uint `json:"ownerid"`
URL string `json:"url"`
}
//LoadTodo permet de lancer le mappage todos
func LoadTodo(){
v1 := Router.Group("/api/v1/todos")
{
v1.POST("/", CreateTodo)
v1.GET("/", FetchAllTodo)
v1.GET("/:id", FetchSingleTodo)
v1.PUT("/:id", UpdateTodo)
v1.DELETE("/:id", DeleteTodo)
}
}
//CreateTodo génération d'un todo
func CreateTodo(c *gin.Context) {
owner, _ := strconv.Atoi(c.PostForm("ownerid"))
todo := Todo{
OwnerID: owner,
URL: c.PostForm("url"),
};
v := validator.NewValidator()
if errs := v.Validate(todo); errs!=nil {
errors := errs.(validator.ErrorMap)
var errOuts []string
for f, e := range errors {
errOuts = append(errOuts, fmt.Sprintf("\t - %s (%v)\n", f, e))
}
//c.JSON(500, gin.H{"Error": errs.Error()})
c.JSON(500, gin.H{"Erreur sur le(s) champ(s) : ": errOuts})
} else {
db, _ := Database()
defer db.Close()
db.Save(&todo)
c.JSON(http.StatusCreated, gin.H{"status" : http.StatusCreated, "message" : "Todo item created successfully!", "resourceId": todo.ID})
}
}
//FetchAllTodo récupération de tous les todos
func FetchAllTodo(c *gin.Context) {
var todos []Todo
var _todos []TransformedTodo
db, _ := Database()
defer db.Close()
db.Find(&todos)
if (len(todos) <= 0) {
c.JSON(http.StatusNotFound, gin.H{"status" : http.StatusNotFound, "message" : "No todo found!"})
return
}
//transforms the todos for building a good response,
//je peux choisir des champs a ne pas display
for _, item := range todos {
status := false
if (item.Status == 1) {
status = true
} else {
status = false
}
_todos = append(_todos, TransformedTodo{ID: item.ID, URL:item.URL})
}
c.JSON(http.StatusOK, gin.H{"status" : http.StatusOK, "data" : _todos})
}
//FetchSingleTodo Récupération d'un seul todo en fonction de son id
func FetchSingleTodo(c *gin.Context) {
var todo Todo
todoID := c.Param("id")
db, _ := Database()
defer db.Close()
db.First(&todo, todoID)
if (todo.ID == 0) {
c.JSON(http.StatusNotFound, gin.H{"status" : http.StatusNotFound, "message" : "No todo found!"})
return
}
_todo := TransformedTodo{ID: todo.ID, URL:todo.URL}
c.JSON(http.StatusOK, gin.H{"status" : http.StatusOK, "data" : _todo})
}
//UpdateTodo Mise à jour d'un todo
func UpdateTodo(c *gin.Context) {
var todo Todo
todoID := c.Param("id")
db, _ := Database()
defer db.Close()
db.First(&todo, todoID)
if (todo.ID == 0) {
c.JSON(http.StatusNotFound, gin.H{"status" : http.StatusNotFound, "message" : "No todo found!"})
return
}
db.Model(&todo).Update("title", c.PostForm("title"))
db.Model(&todo).Update("completed", c.PostForm("completed"))
c.JSON(http.StatusOK, gin.H{"status" : http.StatusOK, "message" : "Todo updated successfully!"})
}
//DeleteTodo Suppression d'un todo
func DeleteTodo(c *gin.Context) {
var todo Todo
todoID := c.Param("id")
db, _ := Database()
defer db.Close()
db.First(&todo, todoID)
if (todo.ID == 0) {
c.JSON(http.StatusNotFound, gin.H{"status" : http.StatusNotFound, "message" : "No todo found!"})
return
}
db.Delete(&todo)
c.JSON(http.StatusOK, gin.H{"status" : http.StatusOK, "message" : "Todo deleted successfully!"})
}
The Idea is to have a xxxxCRUD.go file for each entity to handle but the whole folder in the same package.
the exact errror is :
PS D:\www\developpement> go run .\maincode.go [GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production. - using env: export GIN_MODE=release - using code: gin.SetMode(gin.ReleaseMode)
panic: runtime error: invalid memory address or nil pointer dereference [signal 0xc0000005 code=0x0 addr=0x0 pc=0x46cc0f]
goroutine 1 [running]: panic(0x831880, 0xc04200a080) C:/Go/src/runtime/panic.go:500 +0x1af /D/www/developpement/apirest.LoadTodo() D:/www/developpement/apirest/todoCRUD.go:33 +0x2f [Router.Group] /D/www/developpement/apirest.init.1() D:/www/developpement/apirest/apirest.go:73 +0x220 [LoadTodo()] /D/www/developpement/apirest.init() D:/www/developpement/apirest/todoCRUD.go:190 +0x80 [last line] main.init() D:/www/developpement/maincode.go:13 +0x3a [manners.ListenAndServe(":8080", apirest.Router)] exit status 2
I hope that this will help to understand !
Thanks for your time and help !
Stéphane
