cloudflared-mirror/h2mux/muxmetrics_test.go

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package h2mux
import (
"sync"
"testing"
"time"
"github.com/rs/zerolog"
"github.com/stretchr/testify/assert"
)
func ave(sum uint64, len int) float64 {
return float64(sum) / float64(len)
}
func TestRTTUpdate(t *testing.T) {
r := newRTTData()
start := time.Now()
// send at 0 ms, receive at 2 ms, RTT = 2ms
m := &roundTripMeasurement{receiveTime: start.Add(2 * time.Millisecond), sendTime: start}
r.update(m)
assert.Equal(t, start, r.lastMeasurementTime)
assert.Equal(t, 2*time.Millisecond, r.rtt)
assert.Equal(t, 2*time.Millisecond, r.rttMin)
assert.Equal(t, 2*time.Millisecond, r.rttMax)
// send at 3 ms, receive at 6 ms, RTT = 3ms
m = &roundTripMeasurement{receiveTime: start.Add(6 * time.Millisecond), sendTime: start.Add(3 * time.Millisecond)}
r.update(m)
assert.Equal(t, start.Add(3*time.Millisecond), r.lastMeasurementTime)
assert.Equal(t, 3*time.Millisecond, r.rtt)
assert.Equal(t, 2*time.Millisecond, r.rttMin)
assert.Equal(t, 3*time.Millisecond, r.rttMax)
// send at 7 ms, receive at 8 ms, RTT = 1ms
m = &roundTripMeasurement{receiveTime: start.Add(8 * time.Millisecond), sendTime: start.Add(7 * time.Millisecond)}
r.update(m)
assert.Equal(t, start.Add(7*time.Millisecond), r.lastMeasurementTime)
assert.Equal(t, 1*time.Millisecond, r.rtt)
assert.Equal(t, 1*time.Millisecond, r.rttMin)
assert.Equal(t, 3*time.Millisecond, r.rttMax)
// send at -4 ms, receive at 0 ms, RTT = 4ms, but this ping is before last measurement
// so it will be discarded
m = &roundTripMeasurement{receiveTime: start, sendTime: start.Add(-2 * time.Millisecond)}
r.update(m)
assert.Equal(t, start.Add(7*time.Millisecond), r.lastMeasurementTime)
assert.Equal(t, 1*time.Millisecond, r.rtt)
assert.Equal(t, 1*time.Millisecond, r.rttMin)
assert.Equal(t, 3*time.Millisecond, r.rttMax)
}
func TestFlowControlDataUpdate(t *testing.T) {
f := newFlowControlData()
assert.Equal(t, 0, f.queue.Len())
assert.Equal(t, float64(0), f.ave())
var sum uint64
min := maxWindowSize - dataPoints
max := maxWindowSize
for i := 1; i <= dataPoints; i++ {
size := maxWindowSize - uint32(i)
f.update(size)
assert.Equal(t, max-uint32(1), f.max)
assert.Equal(t, size, f.min)
assert.Equal(t, i, f.queue.Len())
sum += uint64(size)
assert.Equal(t, sum, f.sum)
assert.Equal(t, ave(sum, f.queue.Len()), f.ave())
}
// queue is full, should start to dequeue first element
for i := 1; i <= dataPoints; i++ {
f.update(max)
assert.Equal(t, max, f.max)
assert.Equal(t, min, f.min)
assert.Equal(t, dataPoints, f.queue.Len())
sum += uint64(i)
assert.Equal(t, sum, f.sum)
assert.Equal(t, ave(sum, dataPoints), f.ave())
}
}
func TestMuxMetricsUpdater(t *testing.T) {
t.Skip("Inherently racy test due to muxMetricsUpdaterImpl.run()")
errChan := make(chan error)
abortChan := make(chan struct{})
compBefore, compAfter := NewAtomicCounter(0), NewAtomicCounter(0)
m := newMuxMetricsUpdater(abortChan, compBefore, compAfter)
log := zerolog.Nop()
go func() {
errChan <- m.run(&log)
}()
var wg sync.WaitGroup
wg.Add(2)
// mock muxReader
readerStart := time.Now()
rm := &roundTripMeasurement{receiveTime: readerStart, sendTime: readerStart}
m.updateRTT(rm)
go func() {
defer wg.Done()
assert.Equal(t, 0, dataPoints%4,
"dataPoints is not divisible by 4; this test should be adjusted accordingly")
readerSend := readerStart.Add(time.Millisecond)
for i := 1; i <= dataPoints/4; i++ {
readerReceive := readerSend.Add(time.Duration(i) * time.Millisecond)
rm := &roundTripMeasurement{receiveTime: readerReceive, sendTime: readerSend}
m.updateRTT(rm)
readerSend = readerReceive.Add(time.Millisecond)
m.updateReceiveWindow(uint32(i))
m.updateSendWindow(uint32(i))
m.updateInBoundBytes(uint64(i))
}
}()
// mock muxWriter
go func() {
defer wg.Done()
assert.Equal(t, 0, dataPoints%4,
"dataPoints is not divisible by 4; this test should be adjusted accordingly")
for j := dataPoints/4 + 1; j <= dataPoints/2; j++ {
m.updateReceiveWindow(uint32(j))
m.updateSendWindow(uint32(j))
2021-11-12 15:38:06 +00:00
// should always be discarded since the send time is before readerSend
rm := &roundTripMeasurement{receiveTime: readerStart, sendTime: readerStart.Add(-time.Duration(j*dataPoints) * time.Millisecond)}
m.updateRTT(rm)
m.updateOutBoundBytes(uint64(j))
}
}()
wg.Wait()
metrics := m.metrics()
points := dataPoints / 2
assert.Equal(t, time.Millisecond, metrics.RTTMin)
assert.Equal(t, time.Duration(dataPoints/4)*time.Millisecond, metrics.RTTMax)
// sum(1..i) = i*(i+1)/2, ave(1..i) = i*(i+1)/2/i = (i+1)/2
assert.Equal(t, float64(points+1)/float64(2), metrics.ReceiveWindowAve)
assert.Equal(t, uint32(1), metrics.ReceiveWindowMin)
assert.Equal(t, uint32(points), metrics.ReceiveWindowMax)
assert.Equal(t, float64(points+1)/float64(2), metrics.SendWindowAve)
assert.Equal(t, uint32(1), metrics.SendWindowMin)
assert.Equal(t, uint32(points), metrics.SendWindowMax)
assert.Equal(t, uint64(dataPoints/4), metrics.InBoundRateCurr)
assert.Equal(t, uint64(1), metrics.InBoundRateMin)
assert.Equal(t, uint64(dataPoints/4), metrics.InBoundRateMax)
assert.Equal(t, uint64(dataPoints/2), metrics.OutBoundRateCurr)
assert.Equal(t, uint64(dataPoints/4+1), metrics.OutBoundRateMin)
assert.Equal(t, uint64(dataPoints/2), metrics.OutBoundRateMax)
close(abortChan)
assert.Nil(t, <-errChan)
close(errChan)
}