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use early retransmit for crypto packets

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This commit is contained in:
Marten Seemann 2019-08-08 15:47:51 +07:00
parent ee00cbe088
commit 0e4b25958f
2 changed files with 30 additions and 24 deletions
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42
internal/ackhandler/sent_packet_handler_test.go
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@ -795,26 +795,11 @@ var _ = Describe("SentPacketHandler", func() {
Expect(handler.bytesInFlight).To(BeZero())
})
It("uses early retransmit for crypto packets", func() {
now := time.Now()
handler.SentPacket(cryptoPacket(&Packet{PacketNumber: 1, SendTime: now.Add(-time.Hour)}))
handler.SentPacket(cryptoPacket(&Packet{PacketNumber: 2, SendTime: now.Add(-time.Second)}))
Expect(handler.oneRTTPackets.lossTime.IsZero()).To(BeTrue())
ack := &wire.AckFrame{AckRanges: []wire.AckRange{{Smallest: 2, Largest: 2}}}
Expect(handler.ReceivedAck(ack, 1, protocol.EncryptionInitial, now)).To(Succeed())
Expect(handler.DequeuePacketForRetransmission()).ToNot(BeNil())
Expect(handler.DequeuePacketForRetransmission()).To(BeNil())
// no need to set an alarm, since packet 1 was already declared lost
Expect(handler.initialPackets.lossTime.IsZero()).To(BeTrue())
Expect(handler.bytesInFlight).To(BeZero())
})
It("sets the early retransmit alarm", func() {
now := time.Now()
handler.SentPacket(ackElicitingPacket(&Packet{PacketNumber: 1, SendTime: now.Add(-2 * time.Second), EncryptionLevel: protocol.Encryption1RTT}))
handler.SentPacket(ackElicitingPacket(&Packet{PacketNumber: 2, SendTime: now.Add(-2 * time.Second), EncryptionLevel: protocol.Encryption1RTT}))
handler.SentPacket(ackElicitingPacket(&Packet{PacketNumber: 3, SendTime: now.Add(-time.Second), EncryptionLevel: protocol.Encryption1RTT}))
handler.SentPacket(ackElicitingPacket(&Packet{PacketNumber: 1, SendTime: now.Add(-2 * time.Second)}))
handler.SentPacket(ackElicitingPacket(&Packet{PacketNumber: 2, SendTime: now.Add(-2 * time.Second)}))
handler.SentPacket(ackElicitingPacket(&Packet{PacketNumber: 3, SendTime: now.Add(-time.Second)}))
Expect(handler.oneRTTPackets.lossTime.IsZero()).To(BeTrue())
ack := &wire.AckFrame{AckRanges: []wire.AckRange{{Smallest: 2, Largest: 2}}}
@ -830,6 +815,27 @@ var _ = Describe("SentPacketHandler", func() {
// make sure this is not an RTO: only packet 1 is retransmissted
Expect(handler.DequeuePacketForRetransmission()).To(BeNil())
})
It("sets the early retransmit alarm for crypto packets", func() {
now := time.Now()
handler.SentPacket(cryptoPacket(&Packet{PacketNumber: 1, SendTime: now.Add(-2 * time.Second)}))
handler.SentPacket(cryptoPacket(&Packet{PacketNumber: 2, SendTime: now.Add(-2 * time.Second)}))
handler.SentPacket(cryptoPacket(&Packet{PacketNumber: 3, SendTime: now.Add(-time.Second)}))
Expect(handler.initialPackets.lossTime.IsZero()).To(BeTrue())
ack := &wire.AckFrame{AckRanges: []wire.AckRange{{Smallest: 2, Largest: 2}}}
Expect(handler.ReceivedAck(ack, 1, protocol.EncryptionInitial, now.Add(-time.Second))).To(Succeed())
Expect(handler.rttStats.SmoothedRTT()).To(Equal(time.Second))
// Packet 1 should be considered lost (1+1/8) RTTs after it was sent.
Expect(handler.initialPackets.lossTime.IsZero()).To(BeFalse())
Expect(handler.initialPackets.lossTime.Sub(getPacket(1, protocol.EncryptionInitial).SendTime)).To(Equal(time.Second * 9 / 8))
Expect(handler.OnLossDetectionTimeout()).To(Succeed())
Expect(handler.DequeuePacketForRetransmission()).NotTo(BeNil())
// make sure this is not an RTO: only packet 1 is retransmissted
Expect(handler.DequeuePacketForRetransmission()).To(BeNil())
})
})
Context("crypto packets", func() {