1 files changed, 104 insertions, 0 deletions
diff --git a/cmd/sigsum-debug/spam/leaf/stats.go b/cmd/sigsum-debug/spam/leaf/stats.go
new file mode 100644
index 0000000..b66e83a
--- /dev/null
+++ b/cmd/sigsum-debug/spam/leaf/stats.go
@@ -0,0 +1,104 @@
+package leaf
+
+import (
+	"fmt"
+	"os"
+	"time"
+)
+
+type samples struct {
+	num uint64 // number of samples
+	sum uint64 // total query time (ms)
+	min uint64 // minimum query time (ms)
+	max uint64 // maximum query time (ms)
+}
+
+func newSamples() samples {
+	return samples{min: 18446744073709551615}
+}
+
+func (s *samples) update(sample uint64) {
+	s.num += 1
+	s.sum += sample
+	if sample < s.min {
+		s.min = sample
+	}
+	if sample > s.max {
+		s.max = sample
+	}
+}
+
+func (s *samples) avg() uint64 {
+	if s.num == 0 {
+		return 0
+	}
+	return s.sum / s.num
+}
+
+type status struct {
+	start time.Time // time that measurement started
+
+	num3xx uint64 // number of 3xx responses since last status
+	num4xx uint64 // number of 4xx responses since last status
+	num5xx uint64 // number of 5xx responses since last status
+
+	status200 samples // info about 200 responses since last status
+	status202 samples // info about 202 responses since last status
+}
+
+func newStatus() status {
+	return status{
+		start:     time.Now(),
+		status200: newSamples(),
+		status202: newSamples(),
+	}
+}
+
+func (s *status) reset() {
+	s.num3xx = 0
+	s.num4xx = 0
+	s.num5xx = 0
+
+	s.status200 = newSamples()
+	s.status202 = newSamples()
+}
+
+func (s *status) register(ev *event) {
+	s.num3xx += ev.num3xx
+	s.num4xx += ev.num4xx
+	s.num5xx += ev.num5xx
+
+	delay := uint64(ev.end.Sub(ev.start).Milliseconds())
+	if ev.got200 {
+		s.status200.update(delay)
+	} else {
+		s.status202.update(delay)
+	}
+
+	ev.resetCounters()
+}
+
+func (s *status) rotate(f *os.File) error {
+	str := fmt.Sprintf("%s ", time.Now().Format(time.RFC3339))
+	str += fmt.Sprintf("%d ", uint64(time.Now().Sub(s.start).Milliseconds()/1000))
+	str += fmt.Sprintf("%d ", s.status200.num)
+	str += fmt.Sprintf("%d ", s.status202.num)
+	str += fmt.Sprintf("%d ", s.num3xx)
+	str += fmt.Sprintf("%d ", s.num4xx)
+	str += fmt.Sprintf("%d ", s.num5xx)
+	str += fmt.Sprintf("%d ", s.status200.min)
+	str += fmt.Sprintf("%d ", s.status200.avg())
+	str += fmt.Sprintf("%d ", s.status200.max)
+	str += fmt.Sprintf("%d ", s.status202.min)
+	str += fmt.Sprintf("%d ", s.status202.avg())
+	str += fmt.Sprintf("%d\n", s.status202.max)
+	s.reset()
+
+	_, err := f.WriteString(str)
+	return err
+}
+
+func (s *status) format() string {
+	return "Time RelTime Num200 Num202 Num3xx Num4xx Num5xx Min200 Avg200 Max200 Min202 Avg202 Max202\n" +
+		"      (s)                                       ----> observed response delays (ms) <----"
+}