link

Documentation

Index

• Variables
• type InMemoryRepository
  • func NewInMemoryRepository() *InMemoryRepository
  • func (r *InMemoryRepository) FindByID(ctx context.Context, ID int) (Link, error)
  • func (r *InMemoryRepository) Save(ctx context.Context, l Link) (int, error)
  • func (r *InMemoryRepository) Update(ctx context.Context, l Link) error
• type Link
• type Repository
• type Service
  • func NewService(r Repository) Service

Variables

var ErrAuthentication = errors.New("authentication failed")

ErrAuthentication is returned when the provided credentials cannot be validated.

var ErrInactive = errors.New("link is inactive")

ErrInactive is returned when trying to redirect to a link that has been inactivated.

var ErrNotFound = errors.New("link not found")

ErrNotFound is returned when a Link is not found by any of its attributes.

Types

type InMemoryRepository

type InMemoryRepository struct {
	// contains filtered or unexported fields
}

func NewInMemoryRepository

func NewInMemoryRepository() *InMemoryRepository

func (*InMemoryRepository) FindByID

func (r *InMemoryRepository) FindByID(ctx context.Context, ID int) (Link, error)

func (*InMemoryRepository) Save

func (r *InMemoryRepository) Save(ctx context.Context, l Link) (int, error)

func (*InMemoryRepository) Update

func (r *InMemoryRepository) Update(ctx context.Context, l Link) error

type Link

type Link struct {
	ID       int
	URL      string
	Password []byte
	Count    int
	Inactive bool
}

Link represents an underlying URL with statistics on how it is used.

type Repository

type Repository interface {
	Save(ctx context.Context, l Link) (int, error)
	Update(ctx context.Context, l Link) error
	FindByID(ctx context.Context, ID int) (Link, error)
}

Repository encapsulates the storage of a Link.

type Service

type Service interface {
	Create(ctx context.Context, url, password string) (Link, error)
	Redirect(ctx context.Context, ID int, password string) (Link, error)
	FindByID(ctx context.Context, ID int) (Link, error)
	Inactivate(ctx context.Context, ID int) error
}

Service encapsulates the business logic of a Link. As stated by this principle https://golang.org/doc/effective_go#generality, since the underlying concrete implementation does not export any other method that is not in the interface, we decided to define it where it is implemented rather where it is used (commonly in a handler).

func NewService

func NewService(r Repository) Service