blob: 091e971d2e6faecdce68004485bec2ee30442d72 [file] [log] [blame]
Pragya Arya324337e2020-02-20 14:35:08 +05301package metrics
2
3import (
4 "fmt"
5 "io"
6 "sort"
7 "time"
8)
9
10// Write sorts writes each metric in the given registry periodically to the
11// given io.Writer.
12func Write(r Registry, d time.Duration, w io.Writer) {
13 for _ = range time.Tick(d) {
14 WriteOnce(r, w)
15 }
16}
17
18// WriteOnce sorts and writes metrics in the given registry to the given
19// io.Writer.
20func WriteOnce(r Registry, w io.Writer) {
21 var namedMetrics namedMetricSlice
22 r.Each(func(name string, i interface{}) {
23 namedMetrics = append(namedMetrics, namedMetric{name, i})
24 })
25
26 sort.Sort(namedMetrics)
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.Count())
32 case Gauge:
33 fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
34 fmt.Fprintf(w, " value: %9d\n", metric.Value())
35 case GaugeFloat64:
36 fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
37 fmt.Fprintf(w, " value: %f\n", metric.Value())
38 case Healthcheck:
39 metric.Check()
40 fmt.Fprintf(w, "healthcheck %s\n", namedMetric.name)
41 fmt.Fprintf(w, " error: %v\n", metric.Error())
42 case Histogram:
43 h := metric.Snapshot()
44 ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
45 fmt.Fprintf(w, "histogram %s\n", namedMetric.name)
46 fmt.Fprintf(w, " count: %9d\n", h.Count())
47 fmt.Fprintf(w, " min: %9d\n", h.Min())
48 fmt.Fprintf(w, " max: %9d\n", h.Max())
49 fmt.Fprintf(w, " mean: %12.2f\n", h.Mean())
50 fmt.Fprintf(w, " stddev: %12.2f\n", h.StdDev())
51 fmt.Fprintf(w, " median: %12.2f\n", ps[0])
52 fmt.Fprintf(w, " 75%%: %12.2f\n", ps[1])
53 fmt.Fprintf(w, " 95%%: %12.2f\n", ps[2])
54 fmt.Fprintf(w, " 99%%: %12.2f\n", ps[3])
55 fmt.Fprintf(w, " 99.9%%: %12.2f\n", ps[4])
56 case Meter:
57 m := metric.Snapshot()
58 fmt.Fprintf(w, "meter %s\n", namedMetric.name)
59 fmt.Fprintf(w, " count: %9d\n", m.Count())
60 fmt.Fprintf(w, " 1-min rate: %12.2f\n", m.Rate1())
61 fmt.Fprintf(w, " 5-min rate: %12.2f\n", m.Rate5())
62 fmt.Fprintf(w, " 15-min rate: %12.2f\n", m.Rate15())
63 fmt.Fprintf(w, " mean rate: %12.2f\n", m.RateMean())
64 case Timer:
65 t := metric.Snapshot()
66 ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
67 fmt.Fprintf(w, "timer %s\n", namedMetric.name)
68 fmt.Fprintf(w, " count: %9d\n", t.Count())
69 fmt.Fprintf(w, " min: %9d\n", t.Min())
70 fmt.Fprintf(w, " max: %9d\n", t.Max())
71 fmt.Fprintf(w, " mean: %12.2f\n", t.Mean())
72 fmt.Fprintf(w, " stddev: %12.2f\n", t.StdDev())
73 fmt.Fprintf(w, " median: %12.2f\n", ps[0])
74 fmt.Fprintf(w, " 75%%: %12.2f\n", ps[1])
75 fmt.Fprintf(w, " 95%%: %12.2f\n", ps[2])
76 fmt.Fprintf(w, " 99%%: %12.2f\n", ps[3])
77 fmt.Fprintf(w, " 99.9%%: %12.2f\n", ps[4])
78 fmt.Fprintf(w, " 1-min rate: %12.2f\n", t.Rate1())
79 fmt.Fprintf(w, " 5-min rate: %12.2f\n", t.Rate5())
80 fmt.Fprintf(w, " 15-min rate: %12.2f\n", t.Rate15())
81 fmt.Fprintf(w, " mean rate: %12.2f\n", t.RateMean())
82 }
83 }
84}
85
86type namedMetric struct {
87 name string
88 m interface{}
89}
90
91// namedMetricSlice is a slice of namedMetrics that implements sort.Interface.
92type namedMetricSlice []namedMetric
93
94func (nms namedMetricSlice) Len() int { return len(nms) }
95
96func (nms namedMetricSlice) Swap(i, j int) { nms[i], nms[j] = nms[j], nms[i] }
97
98func (nms namedMetricSlice) Less(i, j int) bool {
99 return nms[i].name < nms[j].name
100}