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package metrics
import (
"bufio"
"fmt"
"log"
"net"
"time"
)
// GraphiteConfig provides a container with configuration parameters for
// the Graphite exporter
type GraphiteConfig struct {
Addr *net.TCPAddr // Network address to connect to
Registry Registry // Registry to be exported
FlushInterval time.Duration // Flush interval
DurationUnit time.Duration // Time conversion unit for durations
Prefix string // Prefix to be prepended to metric names
}
// Graphite is a blocking exporter function which reports metrics in r
// to a graphite server located at addr, flushing them every d duration
// and prepending metric names with prefix.
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,
})
}
// GraphiteWithConfig is a blocking exporter function just like Graphite,
// but it takes a GraphiteConfig instead.
func GraphiteWithConfig(c GraphiteConfig) {
for _ = range time.Tick(c.FlushInterval) {
if err := graphite(&c); nil != err {
log.Println(err)
}
}
}
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 Histogram:
h := metric.Snapshot()
ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
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)
fmt.Fprintf(w, "%s.%s.50-percentile %.2f %d\n", c.Prefix, name, ps[0], now)
fmt.Fprintf(w, "%s.%s.75-percentile %.2f %d\n", c.Prefix, name, ps[1], now)
fmt.Fprintf(w, "%s.%s.95-percentile %.2f %d\n", c.Prefix, name, ps[2], now)
fmt.Fprintf(w, "%s.%s.99-percentile %.2f %d\n", c.Prefix, name, ps[3], now)
fmt.Fprintf(w, "%s.%s.999-percentile %.2f %d\n", c.Prefix, name, ps[4], 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([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
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, int64(du)*t.Min(), now)
fmt.Fprintf(w, "%s.%s.max %d %d\n", c.Prefix, name, int64(du)*t.Max(), now)
fmt.Fprintf(w, "%s.%s.mean %.2f %d\n", c.Prefix, name, du*t.Mean(), now)
fmt.Fprintf(w, "%s.%s.std-dev %.2f %d\n", c.Prefix, name, du*t.StdDev(), now)
fmt.Fprintf(w, "%s.%s.50-percentile %.2f %d\n", c.Prefix, name, du*ps[0], now)
fmt.Fprintf(w, "%s.%s.75-percentile %.2f %d\n", c.Prefix, name, du*ps[1], now)
fmt.Fprintf(w, "%s.%s.95-percentile %.2f %d\n", c.Prefix, name, du*ps[2], now)
fmt.Fprintf(w, "%s.%s.99-percentile %.2f %d\n", c.Prefix, name, du*ps[3], now)
fmt.Fprintf(w, "%s.%s.999-percentile %.2f %d\n", c.Prefix, name, du*ps[4], 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
}
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