Products app

products/app/api/dto.go

@@ -0,0 +1,5 @@
+package api
+
+type PingDto struct {
+	Message string `json:"message"`
+}

products/app/api/helpers.go

@@ -0,0 +1,37 @@
+package api
+
+import (
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+)
+
+func isError(c *gin.Context, err error) bool {
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{
+			"details": err.Error(),
+		})
+		return true
+	}
+	return false
+}
+
+func raiseError(c *gin.Context, errCode int, message string) {
+	c.AbortWithStatusJSON(errCode, gin.H{
+		"details": message,
+	})
+}
+
+func raiseBadRequestError(c *gin.Context, message string) {
+	raiseError(c, http.StatusBadRequest, message)
+}
+
+func raiseNotFoundError(c *gin.Context, message string) {
+	raiseError(c, http.StatusNotFound, message)
+}
+
+func raiseInternalError(c *gin.Context, message string) {
+	c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{
+		"details": "Internal server error. We will we will fix it!",
+	})
+}

products/app/api/response.go

@@ -0,0 +1,7 @@
+package api
+
+import "products/app/db"
+
+type GetProductsResponse struct {
+	Products []db.Product `json:"products"`
+}

products/app/api/router.go

@@ -0,0 +1,75 @@
+package api
+
+import (
+	"fmt"
+	"net/http"
+	"products/app/db"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+)
+
+const HOST = "0.0.0.0"
+const PORT = 3000
+
+func handlePing(c *gin.Context) {
+	c.JSON(
+		http.StatusOK,
+		PingDto{
+			Message: "Pong!",
+		},
+	)
+}
+
+func handleGetProducts(dbConn *gorm.DB) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		products := db.GetProducts(dbConn)
+
+		c.JSON(
+			http.StatusOK,
+			GetProductsResponse{
+				Products: *products,
+			},
+		)
+	}
+}
+
+func handleGetProduct(dbConn *gorm.DB) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		productId, err := strconv.Atoi(c.Param("productId"))
+		if err != nil {
+			raiseBadRequestError(c, "Invalid productId parameter")
+			return
+		}
+
+		product, err := db.GetProduct(dbConn, productId)
+		if err != nil {
+			raiseNotFoundError(c, "Product not found")
+			return
+		}
+
+		c.JSON(
+			http.StatusOK,
+			product,
+		)
+	}
+}
+
+func initRouter(dbConn *gorm.DB) *gin.Engine {
+	gin.SetMode(gin.ReleaseMode)
+	router := gin.Default()
+
+	router.GET("/ping", handlePing)
+	router.GET("/", handleGetProducts(dbConn))
+	router.GET("/:productId", handleGetProduct(dbConn))
+
+	return router
+}
+
+func Serve(dbConn *gorm.DB) {
+	serverAddr := fmt.Sprintf("%s:%d", HOST, PORT)
+
+	router := initRouter(dbConn)
+	router.Run(serverAddr)
+}