fix #1 Cart is empty

controllers/cartItemController.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"net/http"
 	"strconv"
+	"strings"
 
 	"github.com/gin-gonic/gin"
 	"gorm.io/gorm"
@@ -36,6 +37,22 @@ func NewCartItemController() CartItemController {
 	return &cartItemController{}
 }
 
+// getSetCookieValue retrieves the value of a cookie from the Set-Cookie header
+func getSetCookieValue(c *gin.Context, cookieName string) string {
+	// Check the Set-Cookie headers
+	cookies := c.Writer.Header()["Set-Cookie"]
+	for _, cookie := range cookies {
+		if strings.HasPrefix(cookie, cookieName+"=") {
+			// Extract the cookie value
+			parts := strings.SplitN(cookie, ";", 2)
+			if len(parts) > 0 {
+				return strings.TrimPrefix(parts[0], cookieName+"=")
+			}
+		}
+	}
+	return "" // Return empty string if cookie is not found
+}
+
 func generateSessionId(length int) string {
 	bytes := make([]byte, length) // 16 bytes = 128 bits
 	_, err := rand.Read(bytes)
@@ -49,6 +66,13 @@ func GetSessionId(ctx *gin.Context) string {
 	sessionId, err := ctx.Cookie("session_id")
 
 	if err != nil {
+		//we need to check if we already set cookie in the response so that we dont do this multiple times
+		responseCookie := getSetCookieValue(ctx, "session_id")
+
+		if len(responseCookie) != 0 {
+			return responseCookie
+		}
+
 		sessionId = generateSessionId(16)
 		ctx.SetCookie("session_id", sessionId, 3600, "/", "", false, true)
 	}