50 lines
1.3 KiB
Go
50 lines
1.3 KiB
Go
package logutil
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
"time"
|
|
|
|
"github.com/pingcap/log"
|
|
"github.com/pingcap/tidb/pkg/lightning/metric"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"go.uber.org/zap"
|
|
)
|
|
|
|
// RateTracer is a trivial rate tracer based on a prometheus counter.
|
|
// It traces the average speed from it was created.
|
|
type RateTracer struct {
|
|
start time.Time
|
|
base float64
|
|
prometheus.Counter
|
|
}
|
|
|
|
// TraceRateOver make a trivial rater based on a counter.
|
|
// the current value of this counter would be omitted.
|
|
func TraceRateOver(counter prometheus.Counter) RateTracer {
|
|
return RateTracer{
|
|
start: time.Now(),
|
|
Counter: counter,
|
|
base: metric.ReadCounter(counter),
|
|
}
|
|
}
|
|
|
|
// Rate returns the average rate from when it was created.
|
|
func (r *RateTracer) Rate() float64 {
|
|
return r.RateAt(time.Now())
|
|
}
|
|
|
|
// RateAt returns the rate until some instant. This function is mainly for testing.
|
|
// WARN: the counter value for calculating is still its CURRENT VALUE.
|
|
func (r *RateTracer) RateAt(instant time.Time) float64 {
|
|
if r.Counter == nil {
|
|
return math.NaN()
|
|
}
|
|
return (metric.ReadCounter(r.Counter) - r.base) / instant.Sub(r.start).Seconds()
|
|
}
|
|
|
|
// L make a logger with the current speed.
|
|
func (r *RateTracer) L() *zap.Logger {
|
|
return log.L().With(zap.String("speed", fmt.Sprintf("%.2f ops/s", r.Rate())))
|
|
}
|