Refactor Write to export WriteOnce, too.

writer.go

@@ -10,57 +10,61 @@ import (
 // io.Writer.
 func Write(r Registry, d time.Duration, w io.Writer) {
 	for {
-		r.Each(func(name string, i interface{}) {
-			switch m := i.(type) {
-			case Counter:
-				fmt.Fprintf(w, "counter %s\n", name)
-				fmt.Fprintf(w, "  count:       %9d\n", m.Count())
-			case Gauge:
-				fmt.Fprintf(w, "gauge %s\n", name)
-				fmt.Fprintf(w, "  value:       %9d\n", m.Value())
-			case Healthcheck:
-				m.Check()
-				fmt.Fprintf(w, "healthcheck %s\n", name)
-				fmt.Fprintf(w, "  error:       %v\n", m.Error())
-			case Histogram:
-				ps := m.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-				fmt.Fprintf(w, "histogram %s\n", name)
-				fmt.Fprintf(w, "  count:       %9d\n", m.Count())
-				fmt.Fprintf(w, "  min:         %9d\n", m.Min())
-				fmt.Fprintf(w, "  max:         %9d\n", m.Max())
-				fmt.Fprintf(w, "  mean:        %12.2f\n", m.Mean())
-				fmt.Fprintf(w, "  stddev:      %12.2f\n", m.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:
-				fmt.Fprintf(w, "meter %s\n", 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:
-				ps := m.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
-				fmt.Fprintf(w, "timer %s\n", name)
-				fmt.Fprintf(w, "  count:       %9d\n", m.Count())
-				fmt.Fprintf(w, "  min:         %9d\n", m.Min())
-				fmt.Fprintf(w, "  max:         %9d\n", m.Max())
-				fmt.Fprintf(w, "  mean:        %12.2f\n", m.Mean())
-				fmt.Fprintf(w, "  stddev:      %12.2f\n", m.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", 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())
-			}
-		})
+		WriteOnce(r, w)
 		time.Sleep(d)
 	}
 }
+
+func WriteOnce(r Registry, w io.Writer) {
+	r.Each(func(name string, i interface{}) {
+		switch m := i.(type) {
+		case Counter:
+			fmt.Fprintf(w, "counter %s\n", name)
+			fmt.Fprintf(w, "  count:       %9d\n", m.Count())
+		case Gauge:
+			fmt.Fprintf(w, "gauge %s\n", name)
+			fmt.Fprintf(w, "  value:       %9d\n", m.Value())
+		case Healthcheck:
+			m.Check()
+			fmt.Fprintf(w, "healthcheck %s\n", name)
+			fmt.Fprintf(w, "  error:       %v\n", m.Error())
+		case Histogram:
+			ps := m.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
+			fmt.Fprintf(w, "histogram %s\n", name)
+			fmt.Fprintf(w, "  count:       %9d\n", m.Count())
+			fmt.Fprintf(w, "  min:         %9d\n", m.Min())
+			fmt.Fprintf(w, "  max:         %9d\n", m.Max())
+			fmt.Fprintf(w, "  mean:        %12.2f\n", m.Mean())
+			fmt.Fprintf(w, "  stddev:      %12.2f\n", m.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:
+			fmt.Fprintf(w, "meter %s\n", 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:
+			ps := m.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
+			fmt.Fprintf(w, "timer %s\n", name)
+			fmt.Fprintf(w, "  count:       %9d\n", m.Count())
+			fmt.Fprintf(w, "  min:         %9d\n", m.Min())
+			fmt.Fprintf(w, "  max:         %9d\n", m.Max())
+			fmt.Fprintf(w, "  mean:        %12.2f\n", m.Mean())
+			fmt.Fprintf(w, "  stddev:      %12.2f\n", m.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", 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())
+		}
+	})
+}