github.com/linapex/ethereum-go-chinese@v0.0.0-20190316121929-f8b7a73c3fa1/metrics/writer.go (about)

     1  
     2  //<developer>
     3  //    <name>linapex 曹一峰</name>
     4  //    <email>linapex@163.com</email>
     5  //    <wx>superexc</wx>
     6  //    <qqgroup>128148617</qqgroup>
     7  //    <url>https://jsq.ink</url>
     8  //    <role>pku engineer</role>
     9  //    <date>2019-03-16 19:16:40</date>
    10  //</624450100340461569>
    11  
    12  package metrics
    13  
    14  import (
    15  	"fmt"
    16  	"io"
    17  	"sort"
    18  	"time"
    19  )
    20  
    21  //写入排序定期将给定注册表中的每个指标写入
    22  //给定IO.WRITER。
    23  func Write(r Registry, d time.Duration, w io.Writer) {
    24  	for range time.Tick(d) {
    25  		WriteOnce(r, w)
    26  	}
    27  }
    28  
    29  //WriteOnce将给定注册表中的度量值排序并写入给定的
    30  //作者。
    31  func WriteOnce(r Registry, w io.Writer) {
    32  	var namedMetrics namedMetricSlice
    33  	r.Each(func(name string, i interface{}) {
    34  		namedMetrics = append(namedMetrics, namedMetric{name, i})
    35  	})
    36  
    37  	sort.Sort(namedMetrics)
    38  	for _, namedMetric := range namedMetrics {
    39  		switch metric := namedMetric.m.(type) {
    40  		case Counter:
    41  			fmt.Fprintf(w, "counter %s\n", namedMetric.name)
    42  			fmt.Fprintf(w, "  count:       %9d\n", metric.Count())
    43  		case Gauge:
    44  			fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
    45  			fmt.Fprintf(w, "  value:       %9d\n", metric.Value())
    46  		case GaugeFloat64:
    47  			fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
    48  			fmt.Fprintf(w, "  value:       %f\n", metric.Value())
    49  		case Healthcheck:
    50  			metric.Check()
    51  			fmt.Fprintf(w, "healthcheck %s\n", namedMetric.name)
    52  			fmt.Fprintf(w, "  error:       %v\n", metric.Error())
    53  		case Histogram:
    54  			h := metric.Snapshot()
    55  			ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
    56  			fmt.Fprintf(w, "histogram %s\n", namedMetric.name)
    57  			fmt.Fprintf(w, "  count:       %9d\n", h.Count())
    58  			fmt.Fprintf(w, "  min:         %9d\n", h.Min())
    59  			fmt.Fprintf(w, "  max:         %9d\n", h.Max())
    60  			fmt.Fprintf(w, "  mean:        %12.2f\n", h.Mean())
    61  			fmt.Fprintf(w, "  stddev:      %12.2f\n", h.StdDev())
    62  			fmt.Fprintf(w, "  median:      %12.2f\n", ps[0])
    63  			fmt.Fprintf(w, "  75%%:         %12.2f\n", ps[1])
    64  			fmt.Fprintf(w, "  95%%:         %12.2f\n", ps[2])
    65  			fmt.Fprintf(w, "  99%%:         %12.2f\n", ps[3])
    66  			fmt.Fprintf(w, "  99.9%%:       %12.2f\n", ps[4])
    67  		case Meter:
    68  			m := metric.Snapshot()
    69  			fmt.Fprintf(w, "meter %s\n", namedMetric.name)
    70  			fmt.Fprintf(w, "  count:       %9d\n", m.Count())
    71  			fmt.Fprintf(w, "  1-min rate:  %12.2f\n", m.Rate1())
    72  			fmt.Fprintf(w, "  5-min rate:  %12.2f\n", m.Rate5())
    73  			fmt.Fprintf(w, "  15-min rate: %12.2f\n", m.Rate15())
    74  			fmt.Fprintf(w, "  mean rate:   %12.2f\n", m.RateMean())
    75  		case Timer:
    76  			t := metric.Snapshot()
    77  			ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
    78  			fmt.Fprintf(w, "timer %s\n", namedMetric.name)
    79  			fmt.Fprintf(w, "  count:       %9d\n", t.Count())
    80  			fmt.Fprintf(w, "  min:         %9d\n", t.Min())
    81  			fmt.Fprintf(w, "  max:         %9d\n", t.Max())
    82  			fmt.Fprintf(w, "  mean:        %12.2f\n", t.Mean())
    83  			fmt.Fprintf(w, "  stddev:      %12.2f\n", t.StdDev())
    84  			fmt.Fprintf(w, "  median:      %12.2f\n", ps[0])
    85  			fmt.Fprintf(w, "  75%%:         %12.2f\n", ps[1])
    86  			fmt.Fprintf(w, "  95%%:         %12.2f\n", ps[2])
    87  			fmt.Fprintf(w, "  99%%:         %12.2f\n", ps[3])
    88  			fmt.Fprintf(w, "  99.9%%:       %12.2f\n", ps[4])
    89  			fmt.Fprintf(w, "  1-min rate:  %12.2f\n", t.Rate1())
    90  			fmt.Fprintf(w, "  5-min rate:  %12.2f\n", t.Rate5())
    91  			fmt.Fprintf(w, "  15-min rate: %12.2f\n", t.Rate15())
    92  			fmt.Fprintf(w, "  mean rate:   %12.2f\n", t.RateMean())
    93  		}
    94  	}
    95  }
    96  
    97  type namedMetric struct {
    98  	name string
    99  	m    interface{}
   100  }
   101  
   102  //namedmetricslice是实现sort.interface的namedmetrics切片。
   103  type namedMetricSlice []namedMetric
   104  
   105  func (nms namedMetricSlice) Len() int { return len(nms) }
   106  
   107  func (nms namedMetricSlice) Swap(i, j int) { nms[i], nms[j] = nms[j], nms[i] }
   108  
   109  func (nms namedMetricSlice) Less(i, j int) bool {
   110  	return nms[i].name < nms[j].name
   111  }
   112