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ignore the delay field for ACKs sent in Initial and Handshake packets

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This commit is contained in:
Marten Seemann 2019-05-08 14:15:42 +09:00
parent 6c27967c8a
commit f981339bc0
2 changed files with 21 additions and 3 deletions
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7
internal/ackhandler/sent_packet_handler.go
View file

@ -205,7 +205,12 @@ func (h *sentPacketHandler) ReceivedAck(ackFrame *wire.AckFrame, withPacketNumbe
// maybe update the RTT
if p := pnSpace.history.GetPacket(ackFrame.LargestAcked()); p != nil {
h.rttStats.UpdateRTT(rcvTime.Sub(p.SendTime), ackFrame.DelayTime, rcvTime)
// don't use the ack delay for Initial and Handshake packets
var ackDelay time.Duration
if encLevel == protocol.Encryption1RTT {
ackDelay = ackFrame.DelayTime
}
h.rttStats.UpdateRTT(rcvTime.Sub(p.SendTime), ackDelay, rcvTime)
if h.logger.Debug() {
h.logger.Debugf("\tupdated RTT: %s (σ: %s)", h.rttStats.SmoothedRTT(), h.rttStats.MeanDeviation())
}

17
internal/ackhandler/sent_packet_handler_test.go
View file

@ -292,6 +292,20 @@ var _ = Describe("SentPacketHandler", func() {
Expect(handler.rttStats.LatestRTT()).To(BeNumerically("~", 1*time.Minute, 1*time.Second))
})
It("ignores the DelayTime for Initial and Handshake packets", func() {
handler.SentPacket(cryptoPacket(&Packet{PacketNumber: 1}))
now := time.Now()
// make sure the rttStats have a min RTT, so that the delay is used
handler.rttStats.UpdateRTT(5*time.Minute, 0, time.Now())
getPacket(1, protocol.EncryptionInitial).SendTime = now.Add(-10 * time.Minute)
ack := &wire.AckFrame{
AckRanges: []wire.AckRange{{Smallest: 1, Largest: 1}},
DelayTime: 5 * time.Minute,
}
Expect(handler.ReceivedAck(ack, 1, protocol.EncryptionInitial, time.Now())).To(Succeed())
Expect(handler.rttStats.LatestRTT()).To(BeNumerically("~", 10*time.Minute, 1*time.Second))
})
It("uses the DelayTime in the ACK frame", func() {
now := time.Now()
// make sure the rttStats have a min RTT, so that the delay is used
@ -301,8 +315,7 @@ var _ = Describe("SentPacketHandler", func() {
AckRanges: []wire.AckRange{{Smallest: 1, Largest: 1}},
DelayTime: 5 * time.Minute,
}
err := handler.ReceivedAck(ack, 1, protocol.Encryption1RTT, time.Now())
Expect(err).NotTo(HaveOccurred())
Expect(handler.ReceivedAck(ack, 1, protocol.Encryption1RTT, time.Now())).To(Succeed())
Expect(handler.rttStats.LatestRTT()).To(BeNumerically("~", 5*time.Minute, 1*time.Second))
})
})