Adding upstream version 2.5.1.

Signed-off-by: Daniel Baumann <daniel@debian.org>

index/upsidedown/store/metrics/util.go

@@ -0,0 +1,135 @@
+//  Copyright (c) 2015 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package metrics
+
+import (
+	"fmt"
+	"io"
+	"math"
+
+	"github.com/blevesearch/go-metrics"
+)
+
+// NOTE: This is copy & pasted from cbft as otherwise there
+// would be an import cycle.
+
+var timerPercentiles = []float64{0.5, 0.75, 0.95, 0.99, 0.999}
+
+func TimerMap(timer metrics.Timer) map[string]interface{} {
+
+	rv := make(map[string]interface{})
+	t := timer.Snapshot()
+	p := t.Percentiles(timerPercentiles)
+
+	percentileKeys := []string{"median", "75%", "95%", "99%", "99.9%"}
+	percentiles := make(map[string]interface{})
+	for i, pi := range p {
+		if !isNanOrInf(pi) {
+			percentileKey := percentileKeys[i]
+			percentiles[percentileKey] = pi
+		}
+	}
+
+	rateKeys := []string{"1-min", "5-min", "15-min", "mean"}
+	rates := make(map[string]interface{})
+	for i, ri := range []float64{t.Rate1(), t.Rate5(), t.Rate15(), t.RateMean()} {
+		if !isNanOrInf(ri) {
+			rateKey := rateKeys[i]
+			rates[rateKey] = ri
+		}
+	}
+
+	rv["count"] = t.Count()
+	rv["min"] = t.Min()
+	rv["max"] = t.Max()
+	mean := t.Mean()
+	if !isNanOrInf(mean) {
+		rv["mean"] = mean
+	}
+	stddev := t.StdDev()
+	if !isNanOrInf(stddev) {
+		rv["stddev"] = stddev
+	}
+	rv["percentiles"] = percentiles
+	rv["rates"] = rates
+
+	return rv
+}
+
+func isNanOrInf(v float64) bool {
+	if math.IsNaN(v) || math.IsInf(v, 0) {
+		return true
+	}
+	return false
+}
+
+func WriteTimerJSON(w io.Writer, timer metrics.Timer) {
+	t := timer.Snapshot()
+	p := t.Percentiles(timerPercentiles)
+
+	fmt.Fprintf(w, `{"count":%9d,`, t.Count())
+	fmt.Fprintf(w, `"min":%9d,`, t.Min())
+	fmt.Fprintf(w, `"max":%9d,`, t.Max())
+	fmt.Fprintf(w, `"mean":%12.2f,`, t.Mean())
+	fmt.Fprintf(w, `"stddev":%12.2f,`, t.StdDev())
+	fmt.Fprintf(w, `"percentiles":{`)
+	fmt.Fprintf(w, `"median":%12.2f,`, p[0])
+	fmt.Fprintf(w, `"75%%":%12.2f,`, p[1])
+	fmt.Fprintf(w, `"95%%":%12.2f,`, p[2])
+	fmt.Fprintf(w, `"99%%":%12.2f,`, p[3])
+	fmt.Fprintf(w, `"99.9%%":%12.2f},`, p[4])
+	fmt.Fprintf(w, `"rates":{`)
+	fmt.Fprintf(w, `"1-min":%12.2f,`, t.Rate1())
+	fmt.Fprintf(w, `"5-min":%12.2f,`, t.Rate5())
+	fmt.Fprintf(w, `"15-min":%12.2f,`, t.Rate15())
+	fmt.Fprintf(w, `"mean":%12.2f}}`, t.RateMean())
+}
+
+func WriteTimerCSVHeader(w io.Writer, prefix string) {
+	fmt.Fprintf(w, "%s-count,", prefix)
+	fmt.Fprintf(w, "%s-min,", prefix)
+	fmt.Fprintf(w, "%s-max,", prefix)
+	fmt.Fprintf(w, "%s-mean,", prefix)
+	fmt.Fprintf(w, "%s-stddev,", prefix)
+	fmt.Fprintf(w, "%s-percentile-50%%,", prefix)
+	fmt.Fprintf(w, "%s-percentile-75%%,", prefix)
+	fmt.Fprintf(w, "%s-percentile-95%%,", prefix)
+	fmt.Fprintf(w, "%s-percentile-99%%,", prefix)
+	fmt.Fprintf(w, "%s-percentile-99.9%%,", prefix)
+	fmt.Fprintf(w, "%s-rate-1-min,", prefix)
+	fmt.Fprintf(w, "%s-rate-5-min,", prefix)
+	fmt.Fprintf(w, "%s-rate-15-min,", prefix)
+	fmt.Fprintf(w, "%s-rate-mean", prefix)
+}
+
+func WriteTimerCSV(w io.Writer, timer metrics.Timer) {
+	t := timer.Snapshot()
+	p := t.Percentiles(timerPercentiles)
+
+	fmt.Fprintf(w, `%d,`, t.Count())
+	fmt.Fprintf(w, `%d,`, t.Min())
+	fmt.Fprintf(w, `%d,`, t.Max())
+	fmt.Fprintf(w, `%f,`, t.Mean())
+	fmt.Fprintf(w, `%f,`, t.StdDev())
+	fmt.Fprintf(w, `%f,`, p[0])
+	fmt.Fprintf(w, `%f,`, p[1])
+	fmt.Fprintf(w, `%f,`, p[2])
+	fmt.Fprintf(w, `%f,`, p[3])
+	fmt.Fprintf(w, `%f,`, p[4])
+	fmt.Fprintf(w, `%f,`, t.Rate1())
+	fmt.Fprintf(w, `%f,`, t.Rate5())
+	fmt.Fprintf(w, `%f,`, t.Rate15())
+	fmt.Fprintf(w, `%f`, t.RateMean())
+}