package consensus

import "github.com/go-kit/kit/metrics"
import "github.com/go-kit/kit/metrics/discard"

// Metrics contains metrics exposed by this package.
type Metrics struct {
	// height of the chain
	Height metrics.Counter
	// number of validators who signed
	Validators metrics.Gauge
	// number of validators who did not sign
	MissingValidators metrics.Gauge
	// number of validators who tried to double sign
	ByzantineValidators metrics.Gauge
	// number of transactions
	NumTxs metrics.Gauge
	// total number of transactions
	TotalTxs metrics.Counter
	// size of the block
	BlockSizeBytes metrics.Gauge
}

// NopMetrics returns no-op Metrics.
func NopMetrics() *Metrics {
	return &Metrics{
		Height:              discard.NewCounter(),
		Validators:          discard.NewGauge(),
		MissingValidators:   discard.NewGauge(),
		ByzantineValidators: discard.NewGauge(),
		NumTxs:              discard.NewGauge(),
		TotalTxs:            discard.NewCounter(),
		BlockSizeBytes:      discard.NewGauge(),
	}
}