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move calculation of the PTO to the rttStats

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The PTO value is needed at various places in the protocol. Calculating
it on the rttStats struct will allow us to pass around this struct.
This commit is contained in:
Marten Seemann
2019-06-29 14:49:33 +07:00
parent 4366eac105
commit 66abcdfc5c
4 changed files with 23 additions and 19 deletions
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6
internal/ackhandler/sent_packet_handler.go
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@@ -342,7 +342,7 @@ func (h *sentPacketHandler) updateLossDetectionAlarm() {
// Early retransmit timer or time loss detection.
h.alarm = h.lossTime
} else { // PTO alarm
h.alarm = h.lastSentAckElicitingPacketTime.Add(h.computePTOTimeout() << h.ptoCount)
h.alarm = h.lastSentAckElicitingPacketTime.Add(h.rttStats.PTO() << h.ptoCount)
}
}
@@ -657,10 +657,6 @@ func (h *sentPacketHandler) computeCryptoTimeout() time.Duration {
return duration << h.cryptoCount
}
func (h *sentPacketHandler) computePTOTimeout() time.Duration {
return h.rttStats.SmoothedOrInitialRTT() + utils.MaxDuration(4*h.rttStats.MeanDeviation(), protocol.TimerGranularity) + h.rttStats.MaxAckDelay()
}
func (h *sentPacketHandler) ResetForRetry() error {
h.cryptoCount = 0
h.bytesInFlight = 0

14
internal/ackhandler/sent_packet_handler_test.go
View File

@@ -611,20 +611,6 @@ var _ = Describe("SentPacketHandler", func() {
})
Context("probe packets", func() {
It("uses the RTT from RTT stats", func() {
rtt := 2 * time.Second
updateRTT(rtt)
Expect(handler.rttStats.SmoothedOrInitialRTT()).To(Equal(2 * time.Second))
Expect(handler.rttStats.MeanDeviation()).To(Equal(time.Second))
Expect(handler.computePTOTimeout()).To(Equal(time.Duration(2+4) * time.Second))
})
It("uses the granularity for short RTTs", func() {
rtt := time.Microsecond
updateRTT(rtt)
Expect(handler.computePTOTimeout()).To(Equal(rtt + protocol.TimerGranularity))
})
It("implements exponential backoff", func() {
sendTime := time.Now().Add(-time.Hour)
handler.SentPacket(ackElicitingPacket(&Packet{PacketNumber: 1, SendTime: sendTime}))