client

type Client interface {
	// Get returns the randomness at `round` or an error.
	// Requesting round = 0 will return randomness for the most
	// recent known round, bounded at a minimum to the `RoundAt(time.Now())`
	Get(ctx context.Context, round uint64) (Result, error)

	// Watch returns new randomness as it becomes available.
	Watch(ctx context.Context) <-chan Result

	// Info returns the parameters of the chain this client is connected to.
	// The public key, when it started, and how frequently it updates.
	Info(ctx context.Context) (*chain.Info, error)

	// RoundAt will return the most recent round of randomness that will be available
	// at time for the current client.
	RoundAt(time time.Time) uint64

	// Closer means Close() will halt the client, any background processes it runs and any
	// in-flight Get, Watch or Info requests. Behavior for usage of the client
	// after Close is called is undefined.
	io.Closer
}

type LoggingClient interface {
	SetLog(log.Logger)
}

type Result interface {
	GetRound() uint64
	GetRandomness() []byte
	GetSignature() []byte
}