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var (
	// ErrTwoZeroes is an arbitrary business rule for the Add method.
	ErrTwoZeroes = errors.New("can't sum two zeroes")

	// ErrIntOverflow protects the Add method. We've decided that this error
	// indicates a misbehaving service and should count against e.g. circuit
	// breakers. So, we return it directly in endpoints, to illustrate the
	// difference. In a real service, this probably wouldn't be the case.
	ErrIntOverflow = errors.New("integer overflow")

	// ErrMaxSizeExceeded protects the Concat method.
	ErrMaxSizeExceeded = errors.New("result exceeds maximum size")


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type Middleware

type Middleware func(Service) Service

    Middleware describes a service (as opposed to endpoint) middleware.

    func InstrumentingMiddleware

    func InstrumentingMiddleware(ints, chars metrics.Counter) Middleware

      InstrumentingMiddleware returns a service middleware that instruments the number of integers summed and characters concatenated over the lifetime of the service.

      func LoggingMiddleware

      func LoggingMiddleware(logger log.Logger) Middleware

        LoggingMiddleware takes a logger as a dependency and returns a service Middleware.

        type Service

        type Service interface {
        	Sum(ctx context.Context, a, b int) (int, error)
        	Concat(ctx context.Context, a, b string) (string, error)

          Service describes a service that adds things together.

          func New

          func New(logger log.Logger, ints, chars metrics.Counter) Service

            New returns a basic Service with all of the expected middlewares wired in.

            func NewBasicService

            func NewBasicService() Service

              NewBasicService returns a naïve, stateless implementation of Service.