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items.go
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items.go
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package handler
import (
"context"
"fmt"
"github.com/MaximovAlexander/restfull-webapi-go/db"
"github.com/MaximovAlexander/restfull-webapi-go/models"
"github.com/go-chi/chi"
"github.com/go-chi/render"
"net/http"
"strconv"
)
var itemIDKey = "itemID"
func items(router chi.Router) {
router.Get("/", getAllItems)
router.Post("/", createItem)
router.Route("/{itemId}", func(router chi.Router) {
router.Use(ItemContext)
router.Get("/", getItem)
router.Put("/", updateItem)
router.Delete("/", deleteItem)
})
}
func ItemContext(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
itemId := chi.URLParam(r, "itemId")
if itemId == "" {
render.Render(w, r, ErrorRenderer(fmt.Errorf("item ID is required")))
return
}
id, err := strconv.Atoi(itemId)
if err != nil {
render.Render(w, r, ErrorRenderer(fmt.Errorf("invalid item ID")))
}
ctx := context.WithValue(r.Context(), itemIDKey, id)
next.ServeHTTP(w, r.WithContext(ctx))
})
}
func createItem(w http.ResponseWriter, r *http.Request) {
item := &models.Item{}
if err := render.Bind(r, item); err != nil {
render.Render(w, r, ErrBadRequest)
return
}
if err := dbInstance.AddItem(item); err != nil {
render.Render(w, r, ErrorRenderer(err))
return
}
if err := render.Render(w, r, item); err != nil {
render.Render(w, r, ServerErrorRenderer(err))
return
}
}
func getAllItems(w http.ResponseWriter, r *http.Request) {
items, err := dbInstance.GetAllItems()
if err != nil {
render.Render(w, r, ServerErrorRenderer(err))
return
}
if err := render.Render(w, r, items); err != nil {
render.Render(w, r, ErrorRenderer(err))
}
}
func getItem(w http.ResponseWriter, r *http.Request) {
itemID := r.Context().Value(itemIDKey).(int)
item, err := dbInstance.GetItemById(itemID)
if err != nil {
if err == db.ErrNoMatch {
render.Render(w, r, ErrNotFound)
} else {
render.Render(w, r, ErrorRenderer(err))
}
return
}
if err := render.Render(w, r, &item); err != nil {
render.Render(w, r, ServerErrorRenderer(err))
return
}
}
func deleteItem(w http.ResponseWriter, r *http.Request) {
itemId := r.Context().Value(itemIDKey).(int)
err := dbInstance.DeleteItem(itemId)
if err != nil {
if err == db.ErrNoMatch {
render.Render(w, r, ErrNotFound)
} else {
render.Render(w, r, ServerErrorRenderer(err))
}
return
}
}
func updateItem(w http.ResponseWriter, r *http.Request) {
itemId := r.Context().Value(itemIDKey).(int)
itemData := models.Item{}
if err := render.Bind(r, &itemData); err != nil {
render.Render(w, r, ErrBadRequest)
return
}
item, err := dbInstance.UpdateItem(itemId, itemData)
if err != nil {
if err == db.ErrNoMatch {
render.Render(w, r, ErrNotFound)
} else {
render.Render(w, r, ServerErrorRenderer(err))
}
return
}
if err := render.Render(w, r, &item); err != nil {
render.Render(w, r, ServerErrorRenderer(err))
return
}
}