VOL-2496 Add "event listen" command to voltctl
Change-Id: I8f1fb34b55f56c8125142ac289e2f19fc170d804
diff --git a/vendor/github.com/rcrowley/go-metrics/writer.go b/vendor/github.com/rcrowley/go-metrics/writer.go
new file mode 100644
index 0000000..091e971
--- /dev/null
+++ b/vendor/github.com/rcrowley/go-metrics/writer.go
@@ -0,0 +1,100 @@
+package metrics
+
+import (
+ "fmt"
+ "io"
+ "sort"
+ "time"
+)
+
+// Write sorts writes each metric in the given registry periodically to the
+// given io.Writer.
+func Write(r Registry, d time.Duration, w io.Writer) {
+ for _ = range time.Tick(d) {
+ WriteOnce(r, w)
+ }
+}
+
+// WriteOnce sorts and writes metrics in the given registry to the given
+// io.Writer.
+func WriteOnce(r Registry, w io.Writer) {
+ var namedMetrics namedMetricSlice
+ r.Each(func(name string, i interface{}) {
+ namedMetrics = append(namedMetrics, namedMetric{name, i})
+ })
+
+ sort.Sort(namedMetrics)
+ for _, namedMetric := range namedMetrics {
+ switch metric := namedMetric.m.(type) {
+ case Counter:
+ fmt.Fprintf(w, "counter %s\n", namedMetric.name)
+ fmt.Fprintf(w, " count: %9d\n", metric.Count())
+ case Gauge:
+ fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
+ fmt.Fprintf(w, " value: %9d\n", metric.Value())
+ case GaugeFloat64:
+ fmt.Fprintf(w, "gauge %s\n", namedMetric.name)
+ fmt.Fprintf(w, " value: %f\n", metric.Value())
+ case Healthcheck:
+ metric.Check()
+ fmt.Fprintf(w, "healthcheck %s\n", namedMetric.name)
+ fmt.Fprintf(w, " error: %v\n", metric.Error())
+ case Histogram:
+ h := metric.Snapshot()
+ ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
+ fmt.Fprintf(w, "histogram %s\n", namedMetric.name)
+ fmt.Fprintf(w, " count: %9d\n", h.Count())
+ fmt.Fprintf(w, " min: %9d\n", h.Min())
+ fmt.Fprintf(w, " max: %9d\n", h.Max())
+ fmt.Fprintf(w, " mean: %12.2f\n", h.Mean())
+ fmt.Fprintf(w, " stddev: %12.2f\n", h.StdDev())
+ fmt.Fprintf(w, " median: %12.2f\n", ps[0])
+ fmt.Fprintf(w, " 75%%: %12.2f\n", ps[1])
+ fmt.Fprintf(w, " 95%%: %12.2f\n", ps[2])
+ fmt.Fprintf(w, " 99%%: %12.2f\n", ps[3])
+ fmt.Fprintf(w, " 99.9%%: %12.2f\n", ps[4])
+ case Meter:
+ m := metric.Snapshot()
+ fmt.Fprintf(w, "meter %s\n", namedMetric.name)
+ fmt.Fprintf(w, " count: %9d\n", m.Count())
+ fmt.Fprintf(w, " 1-min rate: %12.2f\n", m.Rate1())
+ fmt.Fprintf(w, " 5-min rate: %12.2f\n", m.Rate5())
+ fmt.Fprintf(w, " 15-min rate: %12.2f\n", m.Rate15())
+ fmt.Fprintf(w, " mean rate: %12.2f\n", m.RateMean())
+ case Timer:
+ t := metric.Snapshot()
+ ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
+ fmt.Fprintf(w, "timer %s\n", namedMetric.name)
+ fmt.Fprintf(w, " count: %9d\n", t.Count())
+ fmt.Fprintf(w, " min: %9d\n", t.Min())
+ fmt.Fprintf(w, " max: %9d\n", t.Max())
+ fmt.Fprintf(w, " mean: %12.2f\n", t.Mean())
+ fmt.Fprintf(w, " stddev: %12.2f\n", t.StdDev())
+ fmt.Fprintf(w, " median: %12.2f\n", ps[0])
+ fmt.Fprintf(w, " 75%%: %12.2f\n", ps[1])
+ fmt.Fprintf(w, " 95%%: %12.2f\n", ps[2])
+ fmt.Fprintf(w, " 99%%: %12.2f\n", ps[3])
+ fmt.Fprintf(w, " 99.9%%: %12.2f\n", ps[4])
+ fmt.Fprintf(w, " 1-min rate: %12.2f\n", t.Rate1())
+ fmt.Fprintf(w, " 5-min rate: %12.2f\n", t.Rate5())
+ fmt.Fprintf(w, " 15-min rate: %12.2f\n", t.Rate15())
+ fmt.Fprintf(w, " mean rate: %12.2f\n", t.RateMean())
+ }
+ }
+}
+
+type namedMetric struct {
+ name string
+ m interface{}
+}
+
+// namedMetricSlice is a slice of namedMetrics that implements sort.Interface.
+type namedMetricSlice []namedMetric
+
+func (nms namedMetricSlice) Len() int { return len(nms) }
+
+func (nms namedMetricSlice) Swap(i, j int) { nms[i], nms[j] = nms[j], nms[i] }
+
+func (nms namedMetricSlice) Less(i, j int) bool {
+ return nms[i].name < nms[j].name
+}