feat: add user request limit config (#98)

pkg/cache/user_base.go

@@ -0,0 +1,35 @@
+package cache
+
+import (
+	"time"
+
+	"github.com/patrickmn/go-cache"
+)
+
+// UserServiceInterface 用户业务接口
+type UserServiceInterface interface {
+	// 用户聊天模式
+	GetUserMode(userId string) string
+	SetUserMode(userId, mode string)
+	ClearUserMode(userId string)
+	// 用户聊天上下文
+	GetUserSessionContext(userId string) string
+	SetUserSessionContext(userId, content string)
+	ClearUserSessionContext(userId string)
+	// 用户请求次数
+	SetUseRequestCount(userId string, current int)
+	GetUseRequestCount(uerId string) int
+}
+
+var _ UserServiceInterface = (*UserService)(nil)
+
+// UserService 用戶业务
+type UserService struct {
+	// 缓存
+	cache *cache.Cache
+}
+
+// NewUserService 创建新的业务层
+func NewUserService() UserServiceInterface {
+	return &UserService{cache: cache.New(time.Hour*2, time.Hour*5)}
+}