Created
April 7, 2024 23:10
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| package domain | |
| type Name struct { | |
| value string | |
| } | |
| func NewName(name string) (Name, error) { | |
| if len(name) < 3 || len(name) > 100 { | |
| return Name{}, fmt.Errorf("%w: name length must be less than 3 and gather than 100", ErrInvalidNameLength) | |
| } | |
| return Name{value: name}, nil | |
| } | |
| func (n Name) String() string { | |
| return n.value | |
| } | |
| type UserID struct { | |
| value int64 | |
| } | |
| func NewUserID(value int64) (UserID, error) { | |
| if value <= 0 { | |
| return UserID{}, fmt.Errorf("%w: user id must be greater than 0, but got %d", ErrInvalidID, value) | |
| } | |
| return UserID{value: value}, nil | |
| } | |
| func (uid UserID) Int64() int64 { | |
| return cid.value | |
| } |
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| package service | |
| type CreateUserCommand struct { | |
| Name domain.Name | |
| } | |
| func NewCreateUserCommand(userName string) (*CreateUserCommand, error) { | |
| name, err := domain.NewName(userName) | |
| // handle err | |
| return &CreateUserCommand{ | |
| Name: name, | |
| }, nil | |
| } | |
| func (s *Service) CreateUser(ctx context.Context, cmd *CreateUserCommand) (domain.UserID, error) { | |
| id, err := s.repo.NextID(ctx) | |
| // handle err | |
| user := domain.NewUser(id, cmd.Name, nil) | |
| err = s.repo.Save(ctx, user) | |
| // handle err | |
| return id, nil | |
| } |
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| package presentation | |
| func (h *Handlers) CreateUser( | |
| ctx context.Context, | |
| req *grpc.Request, | |
| ) (*grpc.NewUserResponse, error) { | |
| cmd, err := service.NewCreateUsertCommand( | |
| req.GetName(), | |
| ) | |
| // handle err | |
| userID, err := h.service.CreateUser(ctx, cmd) | |
| // handle err | |
| return &grpc.CreateUserResponse{UserId: userID.Int64()}, nil | |
| } |
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