github.1485827954.workers.dev/ethereum/go-ethereum@v1.14.3/metrics/writer.go (about)

     1  package metrics
     2  
     3  import (
     4  	"fmt"
     5  	"io"
     6  	"slices"
     7  	"strings"
     8  	"time"
     9  )
    10  
    11  // Write sorts writes each metric in the given registry periodically to the
    12  // given io.Writer.
    13  func Write(r Registry, d time.Duration, w io.Writer) {
    14  	for range time.Tick(d) {
    15  		WriteOnce(r, w)
    16  	}
    17  }
    18  
    19  // WriteOnce sorts and writes metrics in the given registry to the given
    20  // io.Writer.
    21  func WriteOnce(r Registry, w io.Writer) {
    22  	var namedMetrics []namedMetric
    23  	r.Each(func(name string, i interface{}) {
    24  		namedMetrics = append(namedMetrics, namedMetric{name, i})
    25  	})
    26  	slices.SortFunc(namedMetrics, namedMetric.cmp)
    27  	for _, namedMetric := range namedMetrics {
    28  		switch metric := namedMetric.m.(type) {
    29  		case Counter:
    30  			fmt.Fprintf(w, "counter %s\n", namedMetric.name)
    31  			fmt.Fprintf(w, "  count:       %9d\n", metric.Snapshot().Count())
    32  		case CounterFloat64:
    33  			fmt.Fprintf(w, "counter %s\n", namedMetric.name)
    34  			fmt.Fprintf(w, "  count:       %f\n", metric.Snapshot().Count())
    35  		case Gauge:
    36  			fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
    37  			fmt.Fprintf(w, "  value:       %9d\n", metric.Snapshot().Value())
    38  		case GaugeFloat64:
    39  			fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
    40  			fmt.Fprintf(w, "  value:       %f\n", metric.Snapshot().Value())
    41  		case GaugeInfo:
    42  			fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
    43  			fmt.Fprintf(w, "  value:       %s\n", metric.Snapshot().Value().String())
    44  		case Healthcheck:
    45  			metric.Check()
    46  			fmt.Fprintf(w, "healthcheck %s\n", namedMetric.name)
    47  			fmt.Fprintf(w, "  error:       %v\n", metric.Error())
    48  		case Histogram:
    49  			h := metric.Snapshot()
    50  			ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
    51  			fmt.Fprintf(w, "histogram %s\n", namedMetric.name)
    52  			fmt.Fprintf(w, "  count:       %9d\n", h.Count())
    53  			fmt.Fprintf(w, "  min:         %9d\n", h.Min())
    54  			fmt.Fprintf(w, "  max:         %9d\n", h.Max())
    55  			fmt.Fprintf(w, "  mean:        %12.2f\n", h.Mean())
    56  			fmt.Fprintf(w, "  stddev:      %12.2f\n", h.StdDev())
    57  			fmt.Fprintf(w, "  median:      %12.2f\n", ps[0])
    58  			fmt.Fprintf(w, "  75%%:         %12.2f\n", ps[1])
    59  			fmt.Fprintf(w, "  95%%:         %12.2f\n", ps[2])
    60  			fmt.Fprintf(w, "  99%%:         %12.2f\n", ps[3])
    61  			fmt.Fprintf(w, "  99.9%%:       %12.2f\n", ps[4])
    62  		case Meter:
    63  			m := metric.Snapshot()
    64  			fmt.Fprintf(w, "meter %s\n", namedMetric.name)
    65  			fmt.Fprintf(w, "  count:       %9d\n", m.Count())
    66  			fmt.Fprintf(w, "  1-min rate:  %12.2f\n", m.Rate1())
    67  			fmt.Fprintf(w, "  5-min rate:  %12.2f\n", m.Rate5())
    68  			fmt.Fprintf(w, "  15-min rate: %12.2f\n", m.Rate15())
    69  			fmt.Fprintf(w, "  mean rate:   %12.2f\n", m.RateMean())
    70  		case Timer:
    71  			t := metric.Snapshot()
    72  			ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
    73  			fmt.Fprintf(w, "timer %s\n", namedMetric.name)
    74  			fmt.Fprintf(w, "  count:       %9d\n", t.Count())
    75  			fmt.Fprintf(w, "  min:         %9d\n", t.Min())
    76  			fmt.Fprintf(w, "  max:         %9d\n", t.Max())
    77  			fmt.Fprintf(w, "  mean:        %12.2f\n", t.Mean())
    78  			fmt.Fprintf(w, "  stddev:      %12.2f\n", t.StdDev())
    79  			fmt.Fprintf(w, "  median:      %12.2f\n", ps[0])
    80  			fmt.Fprintf(w, "  75%%:         %12.2f\n", ps[1])
    81  			fmt.Fprintf(w, "  95%%:         %12.2f\n", ps[2])
    82  			fmt.Fprintf(w, "  99%%:         %12.2f\n", ps[3])
    83  			fmt.Fprintf(w, "  99.9%%:       %12.2f\n", ps[4])
    84  			fmt.Fprintf(w, "  1-min rate:  %12.2f\n", t.Rate1())
    85  			fmt.Fprintf(w, "  5-min rate:  %12.2f\n", t.Rate5())
    86  			fmt.Fprintf(w, "  15-min rate: %12.2f\n", t.Rate15())
    87  			fmt.Fprintf(w, "  mean rate:   %12.2f\n", t.RateMean())
    88  		}
    89  	}
    90  }
    91  
    92  type namedMetric struct {
    93  	name string
    94  	m    interface{}
    95  }
    96  
    97  func (m namedMetric) cmp(other namedMetric) int {
    98  	return strings.Compare(m.name, other.name)
    99  }