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Index ¶
Constants ¶
This section is empty.
Variables ¶
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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") )
Functions ¶
This section is empty.
Types ¶
type Middleware ¶
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 NewBasicService ¶
func NewBasicService() Service
NewBasicService returns a naïve, stateless implementation of Service.
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