TodoApp.go

package main

import (
"strconv"

"github.com/gin-gonic/gin"
"github.com/sony/sonyflake"
)

var (
toDoList []*toDo = make([]*toDo, 0)
flake = sonyflake.NewSonyflake(sonyflake.Settings{})
)

func main() {
r := gin.Default()

//GET todos
r.GET("/todo", func(c *gin.Context) {

c.JSON(200, gin.H{

"toDos": toDoList,
})
})

//POST add a todo
r.POST("/todo", func(c *gin.Context) {
var toDo toDo

if c.ShouldBind(&toDo) == nil {

//Generate a uid
id, _ := flake.NextID()

toDo.ID = id
toDoList = append(toDoList, &toDo)
c.Status(200)
return
}

c.JSON(400, "Failed to bind to model")
})

//DELETE delete a todo
r.DELETE("/todo/:id", func(c *gin.Context) {

//Loop through in memory list and remove matching id if exists.
if id := c.Param("id"); id != "" {

idUint, err := strconv.ParseUint(id, 10, 64)

//Parsing errors are caught here, exit loop if failed to parse id
if err != nil {
c.JSON(400, "Failed to parse ID")
return
}

for in, val := range toDoList {

if val.ID == idUint {

toDoList = append(toDoList[:in], toDoList[in+1:]...)
}
}
}

c.Status(200)
})

//PUT update a todo
r.PUT("/todo/:id", func(c *gin.Context) {

//Loop through in memory list and update matching id if exists.
if id := c.Param("id"); id != "" {

idUint, err := strconv.ParseUint(id, 10, 64)

var toDo toDo

//Parsing and model binding errors are caught here, exit loop if failed to parse id
if c.ShouldBind(&toDo) != nil || err != nil {
c.JSON(400, "Failed to parse ID")
return
}

for in, val := range toDoList {

if val.ID == idUint {
toDo.ID = idUint
toDoList[in] = &toDo
}
}
}

c.Status(200)
})

r.Run()
}

//ToDo type
type toDo struct {
ID uint64
Title string `form:"title"`
Description string `form:"description"`
}