github.com/yinchengtsinghua/golang-Eos-dpos-Ethereum@v0.0.0-20190121132951-92cc4225ed8e/metrics/graphite.go

//此源码被清华学神尹成大魔王专业翻译分析并修改
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package metrics

import (
	"bufio"
	"fmt"
	"log"
	"net"
	"strconv"
	"strings"
	"time"
)

//graphiteconfig为容器提供了
//石墨出口国
type GraphiteConfig struct {
Addr          *net.TCPAddr  //要连接到的网络地址
Registry      Registry      //要导出的注册表
FlushInterval time.Duration //冲洗间隔
DurationUnit  time.Duration //持续时间的时间转换单位
Prefix        string        //要加在指标名称前面的前缀
Percentiles   []float64     //从计时器和柱状图导出的百分比
}

//石墨是一个阻塞导出函数，报告R中的指标
//到位于addr的石墨服务器，每隔d段时间刷新一次
//并在指标名称前面加前缀。
func Graphite(r Registry, d time.Duration, prefix string, addr *net.TCPAddr) {
	GraphiteWithConfig(GraphiteConfig{
		Addr:          addr,
		Registry:      r,
		FlushInterval: d,
		DurationUnit:  time.Nanosecond,
		Prefix:        prefix,
		Percentiles:   []float64{0.5, 0.75, 0.95, 0.99, 0.999},
	})
}

//graphitewithconfig是一个阻塞导出函数，就像graphite一样，
//但它需要一个图形配置。
func GraphiteWithConfig(c GraphiteConfig) {
log.Printf("WARNING: This go-metrics client has been DEPRECATED! It has been moved to https://github.com/cyberdelia/go-metrics-graphite，将于2015年8月12日从rcrowley/go metrics中删除）
	for range time.Tick(c.FlushInterval) {
		if err := graphite(&c); nil != err {
			log.Println(err)
		}
	}
}

//graphiteOnce执行对graphite的单个提交，返回
//连接失败时出现非零错误。这可以在循环中使用
//与用于自定义错误处理的graphitewithconfig类似。
func GraphiteOnce(c GraphiteConfig) error {
log.Printf("WARNING: This go-metrics client has been DEPRECATED! It has been moved to https://github.com/cyberdelia/go-metrics-graphite，将于2015年8月12日从rcrowley/go metrics中删除）
	return graphite(&c)
}

func graphite(c *GraphiteConfig) error {
	now := time.Now().Unix()
	du := float64(c.DurationUnit)
	conn, err := net.DialTCP("tcp", nil, c.Addr)
	if nil != err {
		return err
	}
	defer conn.Close()
	w := bufio.NewWriter(conn)
	c.Registry.Each(func(name string, i interface{}) {
		switch metric := i.(type) {
		case Counter:
			fmt.Fprintf(w, "%s.%s.count %d %d\n", c.Prefix, name, metric.Count(), now)
		case Gauge:
			fmt.Fprintf(w, "%s.%s.value %d %d\n", c.Prefix, name, metric.Value(), now)
		case GaugeFloat64:
			fmt.Fprintf(w, "%s.%s.value %f %d\n", c.Prefix, name, metric.Value(), now)
		case Histogram:
			h := metric.Snapshot()
			ps := h.Percentiles(c.Percentiles)
			fmt.Fprintf(w, "%s.%s.count %d %d\n", c.Prefix, name, h.Count(), now)
			fmt.Fprintf(w, "%s.%s.min %d %d\n", c.Prefix, name, h.Min(), now)
			fmt.Fprintf(w, "%s.%s.max %d %d\n", c.Prefix, name, h.Max(), now)
			fmt.Fprintf(w, "%s.%s.mean %.2f %d\n", c.Prefix, name, h.Mean(), now)
			fmt.Fprintf(w, "%s.%s.std-dev %.2f %d\n", c.Prefix, name, h.StdDev(), now)
			for psIdx, psKey := range c.Percentiles {
				key := strings.Replace(strconv.FormatFloat(psKey*100.0, 'f', -1, 64), ".", "", 1)
				fmt.Fprintf(w, "%s.%s.%s-percentile %.2f %d\n", c.Prefix, name, key, ps[psIdx], now)
			}
		case Meter:
			m := metric.Snapshot()
			fmt.Fprintf(w, "%s.%s.count %d %d\n", c.Prefix, name, m.Count(), now)
			fmt.Fprintf(w, "%s.%s.one-minute %.2f %d\n", c.Prefix, name, m.Rate1(), now)
			fmt.Fprintf(w, "%s.%s.five-minute %.2f %d\n", c.Prefix, name, m.Rate5(), now)
			fmt.Fprintf(w, "%s.%s.fifteen-minute %.2f %d\n", c.Prefix, name, m.Rate15(), now)
			fmt.Fprintf(w, "%s.%s.mean %.2f %d\n", c.Prefix, name, m.RateMean(), now)
		case Timer:
			t := metric.Snapshot()
			ps := t.Percentiles(c.Percentiles)
			fmt.Fprintf(w, "%s.%s.count %d %d\n", c.Prefix, name, t.Count(), now)
			fmt.Fprintf(w, "%s.%s.min %d %d\n", c.Prefix, name, t.Min()/int64(du), now)
			fmt.Fprintf(w, "%s.%s.max %d %d\n", c.Prefix, name, t.Max()/int64(du), now)
			fmt.Fprintf(w, "%s.%s.mean %.2f %d\n", c.Prefix, name, t.Mean()/du, now)
			fmt.Fprintf(w, "%s.%s.std-dev %.2f %d\n", c.Prefix, name, t.StdDev()/du, now)
			for psIdx, psKey := range c.Percentiles {
				key := strings.Replace(strconv.FormatFloat(psKey*100.0, 'f', -1, 64), ".", "", 1)
				fmt.Fprintf(w, "%s.%s.%s-percentile %.2f %d\n", c.Prefix, name, key, ps[psIdx], now)
			}
			fmt.Fprintf(w, "%s.%s.one-minute %.2f %d\n", c.Prefix, name, t.Rate1(), now)
			fmt.Fprintf(w, "%s.%s.five-minute %.2f %d\n", c.Prefix, name, t.Rate5(), now)
			fmt.Fprintf(w, "%s.%s.fifteen-minute %.2f %d\n", c.Prefix, name, t.Rate15(), now)
			fmt.Fprintf(w, "%s.%s.mean-rate %.2f %d\n", c.Prefix, name, t.RateMean(), now)
		}
		w.Flush()
	})
	return nil
}