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log.go
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log.go
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package metrics
import (
"time"
"github.com/msaf1980/go-metrics"
)
type Logger interface {
Printf(format string, v ...interface{})
}
// Log outputs each metric in the given registry periodically using the given logger.
func Log(r metrics.Registry, freq time.Duration, l Logger, minLock bool) {
LogScaled(r, freq, time.Nanosecond, l, minLock)
}
// LogOnCue outputs each metric in the given registry on demand through the channel
// using the given logger
func LogOnCue(r metrics.Registry, ch chan interface{}, l Logger, minLock bool) {
LogScaledOnCue(r, ch, time.Nanosecond, l, minLock)
}
// LogScaled outputs each metric in the given registry periodically using the given
// logger. Print timings in `scale` units (eg time.Millisecond) rather than nanos.
func LogScaled(r metrics.Registry, freq time.Duration, scale time.Duration, l Logger, minLock bool) {
ch := make(chan interface{})
go func(channel chan interface{}) {
for range time.Tick(freq) {
channel <- struct{}{}
}
}(ch)
LogScaledOnCue(r, ch, scale, l, minLock)
}
// LogScaledOnCue outputs each metric in the given registry on demand through the channel
// using the given logger. Print timings in `scale` units (eg time.Millisecond) rather
// than nanos.
func LogScaledOnCue(r metrics.Registry, ch chan interface{}, scale time.Duration, l Logger, minLock bool) {
// du := float64(scale)
// duSuffix := scale.String()[1:]
for range ch {
r.Each(func(name, tags string, tagsMap map[string]string, i interface{}) error {
switch metric := i.(type) {
case metrics.Counter:
l.Printf("counter %s%s count: %9d\n", name, tags, metric.Count())
case metrics.DownCounter:
l.Printf("counter %s%s count: %9d\n", name, tags, metric.Count())
case metrics.Gauge:
l.Printf("gauge %s%s value: %9d\n", name, tags, metric.Value())
case metrics.UGauge:
l.Printf("gauge %s%s value: %9d\n", name, tags, metric.Value())
case metrics.FGauge:
l.Printf("gauge %s%s value: %f\n", name, tags, metric.Value())
case metrics.Healthcheck:
l.Printf("healthcheck %s%s up: %d\n", name, tags, metric.Check())
case metrics.HistogramInterface:
vals := metric.Values()
if metric.IsSummed() {
for i, label := range metric.Labels() {
l.Printf("histogram %s%s %s value: %9d\n", name, tags, label, vals[i])
}
l.Printf("histogram %s%s %s: %9d\n", name, tags, metric.NameTotal(), vals[0])
} else {
var total uint64
for i, label := range metric.Labels() {
l.Printf("histogram %s%s %s value: %9d\n", name, tags, label, vals[i])
total += vals[i]
}
l.Printf("histogram %s%s %s: %9d\n", name, tags, metric.NameTotal(), total)
}
case metrics.Rate:
v, rate := metric.Values()
l.Printf("rate %s%s%s value: %f rate: %f\n", name, metric.Name(), tags, v, rate)
l.Printf("rate %s%s%s value: %f rate: %f\n", name, metric.RateName(), tags, v, rate)
case metrics.FRate:
v, rate := metric.Values()
l.Printf("rate %s%s%s value: %f rate: %f\n", name, metric.Name(), tags, v, rate)
l.Printf("rate %s%s%s value: %f rate: %f\n", name, metric.RateName(), tags, v, rate)
// case metrics.Histogram:
// h := metric.Snapshot()
// ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
// l.Printf("histogram %s%s count: %9d min: %9d max: %9d mean: %9d stddev: %12.2f "+
// "median: %12.2f 75%%: %12.2f 95%%: %12.2f 99%%: %12.2f 99.9%%: %12.2f\n",
// name, tags, h.Count(), h.Min(), h.Max(), h.Mean(), h.StdDev(),
// ps[0], ps[1], ps[2], ps[3], ps[4],
// )
// case metrics.Meter:
// m := metric.Snapshot()
// l.Printf("meter %s%s count: %9d 1-min rate: %12.2f 5-min rate: %12.2f 15-min rate: %12.2f mean rate: %12.2f\n",
// name, tags, m.Count(), m.Rate1(), m.Rate5(), m.Rate15(), m.RateMean(),
// )
// case metrics.Timer:
// t := metric.Snapshot()
// ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
// l.Printf("timer %s%s count: %9d min: %12.2f%s max: %12.2f%s mean: %12.2f%s stddev: %12.2f%s "+
// "median: %12.2f%s 75%%: %12.2f%s 95%%: %12.2f%s 99%%: %12.2f%s 99.9%%: %12.2f%s "+
// "mean rate: %12.2f\n",
// // " 1-min rate: %12.2f 5-min rate: %12.2 15-min rate: %12.2f\n",
// name, tags, t.Count(), float64(t.Min())/du, duSuffix, float64(t.Max())/du, duSuffix,
// t.Mean()/du, duSuffix, t.StdDev()/du, duSuffix,
// ps[0]/du, duSuffix, ps[1]/du, duSuffix, ps[2]/du, duSuffix, ps[3]/du, duSuffix, ps[4]/du, duSuffix,
// t.RateMean(),
// // t.Rate1(), t.Rate5(), t.Rate15(),
// )
}
return nil
}, minLock)
}
}