66 lines
1.9 KiB
Go
66 lines
1.9 KiB
Go
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package teststat
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import (
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"bufio"
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"bytes"
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"io"
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"regexp"
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"strconv"
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"github.com/go-kit/kit/metrics/generic"
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)
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// SumLines expects a regex whose first capture group can be parsed as a
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// float64. It will dump the WriterTo and parse each line, expecting to find a
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// match. It returns the sum of all captured floats.
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func SumLines(w io.WriterTo, regex string) func() float64 {
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return func() float64 {
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sum, _ := stats(w, regex, nil)
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return sum
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}
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}
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// LastLine expects a regex whose first capture group can be parsed as a
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// float64. It will dump the WriterTo and parse each line, expecting to find a
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// match. It returns the final captured float.
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func LastLine(w io.WriterTo, regex string) func() float64 {
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return func() float64 {
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_, final := stats(w, regex, nil)
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return final
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}
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}
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// Quantiles expects a regex whose first capture group can be parsed as a
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// float64. It will dump the WriterTo and parse each line, expecting to find a
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// match. It observes all captured floats into a generic.Histogram with the
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// given number of buckets, and returns the 50th, 90th, 95th, and 99th quantiles
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// from that histogram.
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func Quantiles(w io.WriterTo, regex string, buckets int) func() (float64, float64, float64, float64) {
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return func() (float64, float64, float64, float64) {
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h := generic.NewHistogram("quantile-test", buckets)
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stats(w, regex, h)
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return h.Quantile(0.50), h.Quantile(0.90), h.Quantile(0.95), h.Quantile(0.99)
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}
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}
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func stats(w io.WriterTo, regex string, h *generic.Histogram) (sum, final float64) {
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re := regexp.MustCompile(regex)
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buf := &bytes.Buffer{}
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w.WriteTo(buf)
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//fmt.Fprintf(os.Stderr, "%s\n", buf.String())
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s := bufio.NewScanner(buf)
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for s.Scan() {
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match := re.FindStringSubmatch(s.Text())
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f, err := strconv.ParseFloat(match[1], 64)
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if err != nil {
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panic(err)
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}
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sum += f
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final = f
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if h != nil {
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h.Observe(f)
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}
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}
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return sum, final
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}
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