Merge pull request 'feat/shopping-basket' (#276) from feat/shopping-basket into develop

Reviewed-on: ebhomengo/niki#276
Reviewed-by: hossein <h.nazari1990@gmail.com>

cmd/shoppingbasketapp/command/migrate.go

@@ -0,0 +1 @@
+package command

cmd/shoppingbasketapp/command/root.go

@@ -0,0 +1,52 @@
+package command
+
+import (
+	cfgloader "git.gocasts.ir/ebhomengo/niki/pkg/cfg_loader"
+	"git.gocasts.ir/ebhomengo/niki/pkg/path"
+	"git.gocasts.ir/ebhomengo/niki/shoppingbasketapp"
+	"github.com/spf13/cobra"
+	"log"
+	"os"
+	"path/filepath"
+)
+
+var RootCmd = &cobra.Command{
+	Use:   "shoppingbasket_service",
+	Short: "A CLI for shoppingbasket service",
+	Long: `shoppingbasket Service CLI is a tool to manage and run 
+the shoppingbasket service, including migrations and server startup.`,
+}
+
+func loadAppConfig() shoppingbasketapp.Config {
+	var cfg shoppingbasketapp.Config
+
+	projectRoot, err := path.PathProjectRoot()
+	if err != nil {
+		log.Fatalf("error finding project root: %v", err)
+	}
+
+	yamlPath := os.Getenv("CONFIG_PATH")
+
+	if yamlPath == "" {
+		defaultConfig := filepath.Join(projectRoot, "deploy", "shoppingbasket", "development", "config.yml")
+		if _, err := os.Stat(defaultConfig); err == nil {
+			yamlPath = defaultConfig
+		} else {
+			yamlPath = filepath.Join(projectRoot, "deploy", "shoppingbasket", "development", "config.local.yml")
+		}
+	}
+
+	options := cfgloader.Option{
+		Prefix:       "SHOPPINGBASKET_",
+		Delimiter:    ".",
+		Separator:    "__",
+		YamlFilePath: yamlPath,
+		CallbackEnv:  nil,
+	}
+
+	if err := cfgloader.Load(options, &cfg); err != nil {
+		log.Fatalf("Failed to load benefactor config: %v", err)
+	}
+
+	return cfg
+}

cmd/shoppingbasketapp/command/serve.go

@@ -0,0 +1,43 @@
+package command
+
+import (
+	"context"
+	"fmt"
+	"git.gocasts.ir/ebhomengo/niki/pkg/logger"
+	"git.gocasts.ir/ebhomengo/niki/shoppingbasketapp"
+	"github.com/labstack/gommon/log"
+	"github.com/spf13/cobra"
+)
+
+var ServeCmd = &cobra.Command{
+	Use:   "serve",
+	Short: "Start shoppingbasket service",
+	Long:  `This command starts the main shoppingbasket service.`,
+	Run: func(cmd *cobra.Command, args []string) {
+
+	},
+}
+
+func serve() {
+	var cfg = loadAppConfig()
+
+	logger.Init(cfg.Logger)
+	l := logger.L()
+
+	l.Info("Starting shoppingbasket service...")
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	app, err := shoppingbasketapp.Setup(ctx, cfg)
+	if err != nil {
+		l.Error("failed initialize shopping basket app", "error", err)
+		log.Fatalf(fmt.Sprintf("error starting shopping basket app: %v", err))
+	}
+
+	app.Start()
+}
+
+func init() {
+	RootCmd.AddCommand(ServeCmd)
+}

cmd/shoppingbasketapp/main.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"git.gocasts.ir/ebhomengo/niki/cmd/shoppingbasketapp/command"
+	"os"
+)
+
+func main() {
+	if err := command.RootCmd.Execute(); err != nil {
+		os.Exit(1)
+	}
+}

deploy/shoppingbasket/development/config.local.yml

@@ -0,0 +1,25 @@
+redis:
+  host: "localhost"
+  port: 6379
+  password: ""
+  db: 0
+
+repo:
+  kart_key_prefix: "shopping-basket-cart:"
+  ttl: 3600s
+
+http_server:
+  host: "localhost"
+  port: 8080
+  shutdown_context_timeout: 10s
+  cors:
+    allow_origins:
+      - "*"
+
+
+logger:
+  level: "debug" # Can be `debug`, `info`, `warn`, `error`
+  file_path: "logs/shoppingbasketapp/service.log"
+  use_local_time: true
+  file_max_size_in_mb: 10
+  file_max_age_in_days: 7

logger/logger.go

@@ -16,10 +16,10 @@ const (
 )
 
 type Config struct {
-	FilePath         string
+	FilePath         string `koanf:"file_path"`
-	UseLocalTime     bool
+	UseLocalTime     bool   `koanf:"use_local_time"`
-	FileMaxSizeInMB  int
+	FileMaxSizeInMB  int    `koanf:"file_max_size_in_mb"`
-	FileMaxAgeInDays int
+	FileMaxAgeInDays int    `koanf:"file_max_age_in_days"`
 }
 
 var l *slog.Logger

pkg/httpserver/server.go

@@ -3,11 +3,13 @@ package httpserver
 import (
 	"context"
 	"fmt"
+
 	echomiddleware "github.com/gocasters/rankr/pkg/echo_middleware"
 	"github.com/labstack/echo/v4"
 	"github.com/labstack/echo/v4/middleware"
 	"strings"
 	"sync"
+
 	"time"
 )
 
@@ -19,7 +21,6 @@ type Config struct {
 	HideBanner      bool          `koanf:"hide_banner"`
 	HidePort        bool          `koanf:"hide_port"`
 	PublicPaths     []string      `koanf:"public_paths"`
-
 	// Optional Otel middleware can be injected from outside.
 	OtelMiddleware echo.MiddlewareFunc
 }

shoppingbasketapp/app.go

@@ -0,0 +1,126 @@
+package shoppingbasketapp
+
+import (
+	"context"
+	"fmt"
+	"git.gocasts.ir/ebhomengo/niki/adapter/redis"
+	"git.gocasts.ir/ebhomengo/niki/pkg/httpserver"
+	"git.gocasts.ir/ebhomengo/niki/pkg/logger"
+	"git.gocasts.ir/ebhomengo/niki/shoppingbasketapp/delivery/http"
+	"git.gocasts.ir/ebhomengo/niki/shoppingbasketapp/repository"
+	"git.gocasts.ir/ebhomengo/niki/shoppingbasketapp/service/cart"
+	"os"
+	"os/signal"
+	"sync"
+	"syscall"
+)
+
+type Application struct {
+	Repo    repository.Repo
+	Service cart.Service
+	Handler http.Handler
+	Server  http.Server
+	Config  Config
+}
+
+func Setup(ctx context.Context, cfg Config) (Application, error) {
+
+	adapter := redis.New(cfg.Redis)
+	repo := repository.New(adapter.Client(), cfg.Repo)
+
+	validator := cart.NewValidate()
+	svc := cart.New(validator, repo)
+
+	handler := http.NewHandler(svc)
+
+	httpServer, err := httpserver.New(cfg.HTTPServer)
+	if err != nil {
+		logger.L().Error("failed to initialize http server", "error", err)
+		return Application{}, err
+	}
+	server := http.NewServer(handler, httpServer)
+
+	return Application{
+		Repo:    repo,
+		Service: svc,
+		Handler: handler,
+		Server:  server,
+		Config:  cfg,
+	}, nil
+}
+
+func (app Application) Start() {
+	var wg sync.WaitGroup
+
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	startServers(app, &wg)
+	<-ctx.Done()
+
+	logger.L().Info("Shutdown signal received...")
+
+	shutdownTimeoutCtx, cancel := context.WithTimeout(context.Background(), app.Config.HTTPServer.ShutdownTimeout)
+	defer cancel()
+
+	if app.shutdownServers(shutdownTimeoutCtx) {
+		logger.L().Info("Servers shutdown gracefully")
+	} else {
+		logger.L().Warn("Shutdown timed out, exiting application")
+		return
+	}
+
+	wg.Wait()
+	logger.L().Info("shopping-basket-app stopped")
+}
+
+func startServers(app Application, wg *sync.WaitGroup) {
+	wg.Add(1)
+	go func() {
+		defer wg.Wait()
+		logger.L().Info(fmt.Sprintf("HTTP server starting on port: %d", app.Config.HTTPServer.Port))
+		if err := app.Server.Serve(); err != nil {
+			logger.L().Error(fmt.Sprintf("error listen and serve HTTP server on port %d", app.Config.HTTPServer.Port))
+		}
+
+		logger.L().Info(fmt.Sprintf("HTTP server stopped on port %d", app.Config.HTTPServer.Port))
+	}()
+}
+
+func (app Application) shutdownServers(ctx context.Context) bool {
+	logger.L().Info("Starting server shutdown process...")
+
+	shutdownDone := make(chan struct{})
+
+	go func() {
+		var shutdownWg sync.WaitGroup
+		shutdownWg.Add(1)
+		go app.shutdownHTTPServe(ctx, &shutdownWg)
+
+		shutdownWg.Wait()
+		close(shutdownDone)
+		logger.L().Info("All servers have been shut down successfully.")
+
+	}()
+
+	select {
+	case <-shutdownDone:
+		return true
+	case <-ctx.Done():
+		return false
+	}
+}
+
+func (app Application) shutdownHTTPServe(parentCtx context.Context, wg *sync.WaitGroup) {
+	logger.L().Info(fmt.Sprintf("Starting gracefully shutdown for http server on port %d", app.Config.HTTPServer.Port))
+
+	defer wg.Done()
+	httpShutdownCtx, httpCancel := context.WithTimeout(parentCtx, app.Config.HTTPServer.ShutdownTimeout)
+	defer httpCancel()
+
+	if err := app.Server.Stop(httpShutdownCtx); err != nil {
+		logger.L().Error(fmt.Sprintf("failed http server gracefully shutdown: %v", err))
+	}
+
+	logger.L().Info("Successfully http server gracefully shutdown")
+}

shoppingbasketapp/config.go

@@ -0,0 +1,15 @@
+package shoppingbasketapp
+
+import (
+	"git.gocasts.ir/ebhomengo/niki/adapter/redis"
+	"git.gocasts.ir/ebhomengo/niki/pkg/httpserver"
+	logger "git.gocasts.ir/ebhomengo/niki/pkg/logger"
+	"git.gocasts.ir/ebhomengo/niki/shoppingbasketapp/repository"
+)
+
+type Config struct {
+	Redis      redis.Config      `koanf:"redis" json:"redis"`
+	Repo       repository.Config `koanf:"repo" json:"repo"`
+	HTTPServer httpserver.Config `koanf:"http_server" json:"http_server"`
+	Logger     logger.Config     `koanf:"logger" json:"logger"`
+}

shoppingbasketapp/delivery/http/handler.go

@@ -0,0 +1,117 @@
+package http
+
+import (
+	"git.gocasts.ir/ebhomengo/niki/pkg/claim"
+	httpmsg "git.gocasts.ir/ebhomengo/niki/pkg/http_msg"
+	"git.gocasts.ir/ebhomengo/niki/shoppingbasketapp/service/cart"
+	"git.gocasts.ir/ebhomengo/niki/types"
+	"github.com/labstack/echo/v4"
+	"net/http"
+	"strconv"
+)
+
+type Handler struct {
+	svc cart.Service
+}
+
+func NewHandler(svc cart.Service) Handler {
+	return Handler{svc: svc}
+}
+
+func (h Handler) addToBasket(c echo.Context) error {
+	claims := claim.GetClaimsFromEchoContext(c)
+
+	var req cart.AddToCartRequest
+	if err := c.Bind(&req); err != nil {
+		return c.JSON(http.StatusBadRequest, map[string]string{
+			"error": "invalid request body",
+		})
+	}
+
+	req.UserID = types.ID(claims.UserID)
+	if err := h.svc.AddToBasket(c.Request().Context(), req); err != nil {
+		msg, code := httpmsg.Error(err)
+		return c.JSON(code, msg)
+	}
+
+	return c.NoContent(http.StatusNoContent)
+}
+
+func (h Handler) getCart(c echo.Context) error {
+	claims := claim.GetClaimsFromEchoContext(c)
+
+	res, err := h.svc.GetCart(c.Request().Context(), types.ID(claims.UserID))
+	if err != nil {
+		msg, code := httpmsg.Error(err)
+		return c.JSON(code, msg)
+	}
+
+	return c.JSON(http.StatusOK, res)
+}
+
+func (h Handler) removeCart(c echo.Context) error {
+	claims := claim.GetClaimsFromEchoContext(c)
+
+	if err := h.svc.ClearCart(c.Request().Context(), types.ID(claims.UserID)); err != nil {
+		msg, code := httpmsg.Error(err)
+		return c.JSON(code, msg)
+	}
+
+	return c.NoContent(http.StatusNoContent)
+}
+
+func (h Handler) removeItem(c echo.Context) error {
+	claims := claim.GetClaimsFromEchoContext(c)
+	p := c.Param("productID")
+
+	pID, err := strconv.Atoi(p)
+	if err != nil {
+		return c.JSON(http.StatusBadRequest, map[string]string{
+			"error": "invalid product id",
+		})
+	}
+
+	var req cart.RemoveFromCartRequest
+
+	req.UserID = types.ID(claims.UserID)
+	req.ProductID = types.ID(pID)
+
+	if err := h.svc.RemoveFromCart(c.Request().Context(), req); err != nil {
+		msg, code := httpmsg.Error(err)
+		return c.JSON(code, msg)
+	}
+
+	return c.NoContent(http.StatusNoContent)
+}
+
+func (h Handler) updateQuantity(c echo.Context) error {
+	claims := claim.GetClaimsFromEchoContext(c)
+	p := c.Param("productID")
+
+	pID, err := strconv.Atoi(p)
+	if err != nil {
+		return c.JSON(http.StatusBadRequest, map[string]string{
+			"error": "invalid product id",
+		})
+	}
+
+	qStr := c.Param("quantity")
+	q, err := strconv.Atoi(qStr)
+	if err != nil {
+		return c.JSON(http.StatusBadRequest, map[string]string{
+			"error": "invalid quantity",
+		})
+	}
+
+	var req cart.UpdateQuantityRequest
+	req.UserID = types.ID(claims.UserID)
+	req.ProductID = types.ID(pID)
+	req.Quantity = q
+
+	if err := h.svc.UpdateQuantity(c.Request().Context(), req); err != nil {
+		msg, code := httpmsg.Error(err)
+		return c.JSON(code, msg)
+	}
+
+	return c.NoContent(http.StatusNoContent)
+}

shoppingbasketapp/delivery/http/health_check.go

@@ -0,0 +1,12 @@
+package http
+
+import (
+	"github.com/labstack/echo/v4"
+	"net/http"
+)
+
+func (s Server) healthCheck(c echo.Context) error {
+	return c.JSON(http.StatusOK, echo.Map{
+		"message": "everything is good!",
+	})
+}

shoppingbasketapp/delivery/http/server.go

@@ -0,0 +1,43 @@
+package http
+
+import (
+	"context"
+	"git.gocasts.ir/ebhomengo/niki/pkg/httpserver"
+)
+
+type Server struct {
+	handler    Handler
+	HTTPServer *httpserver.Server
+}
+
+func NewServer(handler Handler, hS *httpserver.Server) Server {
+	return Server{handler: handler, HTTPServer: hS}
+}
+
+func (s Server) Serve() error {
+	s.registerRoutes()
+	if err := s.HTTPServer.Start(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (s Server) Stop(ctx context.Context) error {
+	return s.HTTPServer.Stop(ctx)
+}
+
+func (s Server) registerRoutes() {
+	router := s.HTTPServer.GetRouter()
+
+	router.GET("shoppingbasket/health-check", s.healthCheck)
+
+	r := router.Group("shoppingbasket/cart") // Authentication is required
+
+	r.GET("/", s.handler.getCart)
+	r.DELETE("/", s.handler.removeCart)
+
+	r.POST("/items", s.handler.addToBasket)
+	r.DELETE("/items/:productID", s.handler.removeItem)
+	r.PUT("/items/:productID/:quantity", s.handler.updateQuantity)
+}

shoppingbasketapp/repository/cart.go

@@ -0,0 +1,272 @@
+package repository
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	richerror "git.gocasts.ir/ebhomengo/niki/pkg/rich_error"
+	"git.gocasts.ir/ebhomengo/niki/shoppingbasketapp/service/cart"
+	"git.gocasts.ir/ebhomengo/niki/types"
+	"github.com/redis/go-redis/v9"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const (
+	FieldNumber     = 5
+	UserIDField     = "user_id"
+	CreatedAtField  = "created_at"
+	ExpireAtField   = "expire_at"
+	TotalPriceField = "total_price"
+)
+
+type Config struct {
+	KartKeyPrefix string        `koanf:"kart_key_prefix"`
+	TTL           time.Duration `koanf:"ttl"`
+}
+
+type Repo struct {
+	client *redis.Client
+	config Config
+}
+
+func New(client *redis.Client, cfg Config) Repo {
+	return Repo{client: client, config: cfg}
+}
+
+func (r Repo) cartKey(userID types.ID) string {
+	return r.config.KartKeyPrefix + fmt.Sprintf("%d", userID)
+}
+
+func (r Repo) itemKey(productID types.ID) string {
+	return fmt.Sprintf("item:%d", productID)
+}
+
+func (r Repo) AddItem(ctx context.Context, userID types.ID, item cart.Item) error {
+	const op = "shoppingbasketapp.repository.AddItem"
+
+	cartKey := r.cartKey(userID)
+	itemKey := r.itemKey(item.ProductID)
+	now := time.Now().UnixNano()
+
+	itemJson, _ := json.Marshal(item)
+
+	exists, _ := r.client.Exists(ctx, cartKey).Result()
+
+	if exists == 0 {
+		r.client.HSet(ctx, cartKey, map[string]interface{}{
+			UserIDField:     userID,
+			itemKey:         string(itemJson),
+			TotalPriceField: item.Price * types.Price(item.Quantity),
+			CreatedAtField:  now,
+			ExpireAtField:   now + r.config.TTL.Nanoseconds(),
+		})
+	} else {
+		existsItem, _ := r.client.HGet(ctx, cartKey, itemKey).Result()
+		if existsItem != "" {
+			var i cart.Item
+			if err := json.Unmarshal([]byte(existsItem), &i); err != nil {
+				return richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+			}
+
+			item.Quantity += i.Quantity
+			itemJson, _ = json.Marshal(item)
+		}
+
+		r.client.HSet(ctx, cartKey, itemKey, string(itemJson))
+		r.client.HSet(ctx, cartKey, ExpireAtField, now+r.config.TTL.Nanoseconds())
+		if err := r.updateTotalPrice(ctx, cartKey); err != nil {
+			return err
+		}
+	}
+
+	r.client.Expire(ctx, cartKey, r.config.TTL)
+
+	return nil
+}
+
+func parsInt(s string) int64 {
+	i, _ := strconv.ParseInt(s, 10, 64)
+	return i
+}
+
+func (r Repo) GetCart(ctx context.Context, userID types.ID) (cart.Cart, error) {
+	const op = "shoppingbasketapp.repository.GetCart"
+	cartKey := r.cartKey(userID)
+
+	exists, err := r.client.Exists(ctx, cartKey).Result()
+	if err != nil {
+		return cart.Cart{}, richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+	}
+
+	if exists == 0 {
+		return cart.Cart{}, richerror.New(op).WithKind(richerror.KindNotFound).WithMessage("not found shopping basket")
+	}
+
+	allCart, err := r.client.HGetAll(ctx, cartKey).Result()
+	if err != nil {
+		return cart.Cart{}, richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+	}
+
+	c := cart.Cart{Items: []cart.Item{}}
+
+	for field, value := range allCart {
+		if strings.HasPrefix(field, "item:") {
+			var i cart.Item
+			if err := json.Unmarshal([]byte(value), &i); err != nil {
+				return cart.Cart{}, richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+			}
+
+			c.Items = append(c.Items, i)
+
+			continue
+		}
+
+		switch field {
+		case UserIDField:
+			c.UserID = types.ID(parsInt(value))
+		case TotalPriceField:
+			c.TotalPrice = types.Price(parsInt(value))
+		case CreatedAtField:
+			c.CreatedAt = parsInt(value)
+		case ExpireAtField:
+			c.ExpireAt = parsInt(value)
+		}
+	}
+
+	return c, nil
+}
+
+func (r Repo) DeleteItem(ctx context.Context, userID, productID types.ID) error {
+	const op = "shoppingbasketapp.repository.DeleteItem"
+	cartKey := r.cartKey(userID)
+	itemKey := r.itemKey(productID)
+
+	if err := r.existsCart(ctx, cartKey); err != nil {
+		return err
+	}
+
+	if err := r.existsItem(ctx, cartKey, itemKey); err != nil {
+		return err
+	}
+
+	if err := r.client.HDel(ctx, cartKey, itemKey).Err(); err != nil {
+		return richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+	}
+
+	num, err := r.client.HLen(ctx, cartKey).Result()
+	if err != nil {
+		return richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+	}
+
+	if num < FieldNumber {
+		return r.DeleteCart(ctx, userID)
+	}
+
+	return r.updateTotalPrice(ctx, cartKey)
+}
+
+func (r Repo) UpdateQuantity(ctx context.Context, userID, productID types.ID, quantity int) error {
+	const op = "shoppingbasketapp.repository.UpdateQuantity"
+	cartKey := r.cartKey(userID)
+	itemKey := r.itemKey(productID)
+
+	if err := r.existsCart(ctx, cartKey); err != nil {
+		return err
+	}
+
+	if err := r.existsItem(ctx, cartKey, itemKey); err != nil {
+		return err
+	}
+
+	data, err := r.client.HGet(ctx, cartKey, itemKey).Result()
+	if err != nil {
+		return richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+	}
+
+	var item cart.Item
+	if err := json.Unmarshal([]byte(data), &item); err != nil {
+		return richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+	}
+
+	item.Quantity = quantity
+
+	j, _ := json.Marshal(item)
+
+	if err := r.client.HSet(ctx, cartKey, itemKey, string(j)).Err(); err != nil {
+		return richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+	}
+
+	return r.updateTotalPrice(ctx, cartKey)
+}
+
+func (r Repo) DeleteCart(ctx context.Context, userID types.ID) error {
+	const op = "shoppingbasketapp.repository.DeleteCart"
+	cartKey := r.cartKey(userID)
+
+	if err := r.existsCart(ctx, cartKey); err != nil {
+		return err
+	}
+
+	if err := r.client.Del(ctx, cartKey).Err(); err != nil {
+		return richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+	}
+
+	return nil
+}
+
+func (r Repo) updateTotalPrice(ctx context.Context, cartKey string) error {
+	const op = "shoppingbasketapp.repository.updateTotalPrice"
+
+	allFields, err := r.client.HGetAll(ctx, cartKey).Result()
+	if err != nil {
+		return richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+	}
+
+	var total types.Price
+
+	for field, value := range allFields {
+		if strings.HasPrefix(field, "item:") {
+			var item cart.Item
+
+			if err := json.Unmarshal([]byte(value), &item); err != nil {
+				return richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+			}
+
+			total += item.Price * types.Price(item.Quantity)
+		}
+	}
+
+	return r.client.HSet(ctx, cartKey, TotalPriceField, int64(total)).Err()
+}
+
+func (r Repo) existsCart(ctx context.Context, cartKey string) error {
+	const op = "shoppingbasketapp.repository.existsCart"
+
+	exists, err := r.client.Exists(ctx, cartKey).Result()
+	if err != nil {
+		return richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+	}
+
+	if exists == 0 {
+		return richerror.New(op).WithKind(richerror.KindNotFound).WithMessage("not found shopping basket")
+	}
+
+	return nil
+}
+
+func (r Repo) existsItem(ctx context.Context, cartKey, itemKey string) error {
+	const op = "shoppingbasketapp.repository.existsCart"
+
+	exists, err := r.client.HExists(ctx, cartKey, itemKey).Result()
+	if err != nil {
+		return richerror.New(op).WithKind(richerror.KindUnexpected).WithErr(err)
+	}
+
+	if !exists {
+		return richerror.New(op).WithKind(richerror.KindNotFound).WithMessage("not found product form shopping basket")
+	}
+
+	return nil
+}

shoppingbasketapp/service/cart/entity.go

@@ -0,0 +1,21 @@
+package cart
+
+import (
+	"git.gocasts.ir/ebhomengo/niki/types"
+)
+
+type Item struct {
+	ProductID types.ID
+	Quantity  int
+	Price     types.Price
+	Name      string
+	AddedAt   int64
+}
+
+type Cart struct {
+	UserID     types.ID
+	Items      []Item
+	TotalPrice types.Price
+	ExpireAt   int64
+	CreatedAt  int64
+}

shoppingbasketapp/service/cart/param.go

@@ -0,0 +1,30 @@
+package cart
+
+import "git.gocasts.ir/ebhomengo/niki/types"
+
+type AddToCartRequest struct {
+	UserID    types.ID    `json:"user_id"`
+	ProductID types.ID    `json:"product_id"`
+	Quantity  int         `json:"quantity"`
+	Price     types.Price `json:"price"`
+	Name      string      `json:"name"`
+}
+
+type GetCartResponse struct {
+	UserID     types.ID    `json:"user_id"`
+	Items      []Item      `json:"items"`
+	TotalPrice types.Price `json:"total_price"`
+	CreatedAt  int64       `json:"created_at"`
+	ExpireAt   int64       `json:"expire_at"`
+}
+
+type RemoveFromCartRequest struct {
+	UserID    types.ID `json:"user_id"`
+	ProductID types.ID `json:"product_id"`
+}
+
+type UpdateQuantityRequest struct {
+	UserID    types.ID `json:"user_id"`
+	ProductID types.ID `json:"product_id"`
+	Quantity  int      `json:"quantity"`
+}

shoppingbasketapp/service/cart/service.go

@@ -0,0 +1,103 @@
+package cart
+
+import (
+	"context"
+	"git.gocasts.ir/ebhomengo/niki/pkg/logger"
+	richerror "git.gocasts.ir/ebhomengo/niki/pkg/rich_error"
+	"git.gocasts.ir/ebhomengo/niki/types"
+	"time"
+)
+
+type Repository interface {
+	AddItem(ctx context.Context, userID types.ID, item Item) error
+	GetCart(ctx context.Context, userID types.ID) (Cart, error)
+	DeleteItem(ctx context.Context, userID, productID types.ID) error
+	UpdateQuantity(ctx context.Context, userID, productID types.ID, quantity int) error
+	DeleteCart(ctx context.Context, userID types.ID) error
+}
+
+type Service struct {
+	validate Validate
+	repo     Repository
+}
+
+func New(val Validate, repo Repository) Service {
+	return Service{validate: val, repo: repo}
+}
+
+func (s Service) AddToBasket(ctx context.Context, req AddToCartRequest) error {
+	const op = "shoppingbasketapp.service.AddToBasket"
+
+	if err := s.validate.ValidateAddToCart(req); err != nil {
+		logger.L().Error("shoppingbasket-service-AddToBasket", "error", err)
+		return err
+	}
+
+	return s.repo.AddItem(ctx, req.UserID, Item{
+		ProductID: req.ProductID,
+		Quantity:  req.Quantity,
+		Price:     req.Price,
+		Name:      req.Name,
+		AddedAt:   time.Now().UnixNano(),
+	})
+}
+
+func (s Service) GetCart(ctx context.Context, userID types.ID) (GetCartResponse, error) {
+	const op = "shoppingbasketapp.service.GetCart"
+	if userID < 1 {
+		logger.L().Error("shoppingbasket-service-GetCart", "error", "user id must be greater than 1")
+		return GetCartResponse{}, richerror.New(op).WithKind(richerror.KindInvalid).WithMessage("invalid user id")
+	}
+
+	res, err := s.repo.GetCart(ctx, userID)
+	if err != nil {
+		logger.L().Error("shoppingbasket-service-GetCart", "error", err)
+		return GetCartResponse{}, richerror.New(op).WithErr(err)
+	}
+
+	return GetCartResponse{
+		UserID:     res.UserID,
+		Items:      res.Items,
+		TotalPrice: res.TotalPrice,
+		CreatedAt:  res.CreatedAt,
+		ExpireAt:   res.ExpireAt,
+	}, nil
+}
+
+func (s Service) RemoveFromCart(ctx context.Context, req RemoveFromCartRequest) error {
+	const op = "shoppingbaskerapp.service.RemoveFromCart"
+
+	if err := s.validate.ValidateRemoveFromCart(req); err != nil {
+		logger.L().Error("shoppingbasket-service-RemoveFromCart", "error", err)
+		return err
+	}
+
+	return s.repo.DeleteItem(ctx, req.UserID, req.ProductID)
+}
+
+func (s Service) UpdateQuantity(ctx context.Context, req UpdateQuantityRequest) error {
+	const op = "shoppingbaskerapp.service.UpdateQuantity"
+
+	if err := s.validate.ValidateUpdateQuantity(req); err != nil {
+		logger.L().Error("shoppingbasket-service-UpdateQuantity", "error", err)
+		return err
+	}
+
+	if req.Quantity == 0 {
+		return s.repo.DeleteItem(ctx, req.UserID, req.ProductID)
+	}
+
+	return s.repo.UpdateQuantity(ctx, req.UserID, req.ProductID, req.Quantity)
+}
+
+func (s Service) ClearCart(ctx context.Context, userID types.ID) error {
+	const op = "shoppingbaskerapp.service.ClearCart"
+
+	if userID < 1 {
+		logger.L().Error("shoppingbasket-service-ClearCart", "error", "user id must be greater than 1")
+		return richerror.New(op).WithKind(richerror.KindInvalid).
+			WithMessage("invalid user id")
+	}
+
+	return s.repo.DeleteCart(ctx, userID)
+}

shoppingbasketapp/service/cart/validator.go

@@ -0,0 +1,91 @@
+package cart
+
+import (
+	richerror "git.gocasts.ir/ebhomengo/niki/pkg/rich_error"
+	validation "github.com/go-ozzo/ozzo-validation/v4"
+)
+
+const (
+	ErrValidationPositive     = "must be positive"
+	ErrValidationInvalidInput = "invalid input"
+)
+
+type Validate struct{}
+
+func NewValidate() Validate {
+	return Validate{}
+}
+
+func (v Validate) ValidateAddToCart(req AddToCartRequest) error {
+	const op = "shoppingbasketapp.service.AddToCart"
+
+	if err := validation.ValidateStruct(&req,
+		validation.Field(&req.UserID, validation.Required),
+		validation.Field(&req.ProductID, validation.Required),
+		validation.Field(&req.Price, validation.Required, validation.Min(int64(1)).Error(ErrValidationPositive)),
+		validation.Field(&req.Quantity, validation.Min(int(1)).Error(ErrValidationPositive)),
+		validation.Field(&req.Name, validation.Required)); err != nil {
+
+		fieldErr := make(map[string]interface{})
+		vErr, ok := err.(validation.Errors)
+		if ok {
+			for key, value := range vErr {
+				if value != nil {
+					fieldErr[key] = value.Error()
+				}
+			}
+		}
+
+		return richerror.New(op).WithMessage(ErrValidationInvalidInput).
+			WithMeta(fieldErr).WithErr(err).WithKind(richerror.KindInvalid)
+	}
+
+	return nil
+}
+
+func (v Validate) ValidateRemoveFromCart(req RemoveFromCartRequest) error {
+	const op = "shoppingbasketapp.service.ValidateRemoveFromCart"
+
+	if err := validation.ValidateStruct(&req,
+		validation.Field(&req.UserID, validation.Required),
+		validation.Field(&req.ProductID, validation.Required)); err != nil {
+
+		fieldErrs := make(map[string]interface{})
+		vErr, ok := err.(validation.Errors)
+		if ok {
+			for key, value := range vErr {
+				if value != nil {
+					fieldErrs[key] = value.Error()
+				}
+			}
+		}
+		return richerror.New(op).WithMessage(ErrValidationInvalidInput).
+			WithKind(richerror.KindInvalid).WithMeta(fieldErrs).WithErr(err)
+	}
+
+	return nil
+}
+
+func (v Validate) ValidateUpdateQuantity(req UpdateQuantityRequest) error {
+	const op = "shoppingbasketapp.service.ValidateUpdateQuantity"
+
+	if err := validation.ValidateStruct(&req,
+		validation.Field(&req.UserID, validation.Required),
+		validation.Field(&req.ProductID, validation.Required),
+		validation.Field(&req.Quantity, validation.Required, validation.Min(int(1)))); err != nil {
+
+		fieldErrs := make(map[string]interface{})
+		vErr, ok := err.(validation.Errors)
+		if ok {
+			for key, value := range vErr {
+				if value != nil {
+					fieldErrs[key] = value.Error()
+				}
+			}
+		}
+		return richerror.New(op).WithMessage(ErrValidationInvalidInput).
+			WithKind(richerror.KindInvalid).WithMeta(fieldErrs).WithErr(err)
+	}
+
+	return nil
+}