mirror of
https://github.com/refraction-networking/uquic.git
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825 lines
36 KiB
Go
825 lines
36 KiB
Go
package ackhandler
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import (
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"sort"
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"time"
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"github.com/golang/mock/gomock"
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"github.com/lucas-clemente/quic-go/internal/congestion"
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"github.com/lucas-clemente/quic-go/internal/mocks"
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"github.com/lucas-clemente/quic-go/internal/protocol"
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"github.com/lucas-clemente/quic-go/internal/wire"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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func retransmittablePacket(p *Packet) *Packet {
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if p.EncryptionLevel == protocol.EncryptionUnspecified {
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p.EncryptionLevel = protocol.EncryptionForwardSecure
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}
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if p.Length == 0 {
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p.Length = 1
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}
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if p.SendTime.IsZero() {
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p.SendTime = time.Now()
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}
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p.Frames = []wire.Frame{&wire.PingFrame{}}
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return p
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}
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func nonRetransmittablePacket(p *Packet) *Packet {
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p = retransmittablePacket(p)
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p.Frames = []wire.Frame{&wire.AckFrame{}}
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return p
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}
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func handshakePacket(p *Packet) *Packet {
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p = retransmittablePacket(p)
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p.EncryptionLevel = protocol.EncryptionUnencrypted
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return p
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}
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func createAck(ranges []wire.AckRange) *wire.AckFrame {
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sort.Slice(ranges, func(i, j int) bool {
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return ranges[i].First > ranges[j].First
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})
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ack := &wire.AckFrame{
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LowestAcked: ranges[len(ranges)-1].First,
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LargestAcked: ranges[0].Last,
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}
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if len(ranges) > 1 {
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ack.AckRanges = ranges
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}
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return ack
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}
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var _ = Describe("SentPacketHandler", func() {
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var (
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handler *sentPacketHandler
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streamFrame wire.StreamFrame
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)
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BeforeEach(func() {
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rttStats := &congestion.RTTStats{}
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handler = NewSentPacketHandler(rttStats).(*sentPacketHandler)
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handler.SetHandshakeComplete()
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streamFrame = wire.StreamFrame{
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StreamID: 5,
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Data: []byte{0x13, 0x37},
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}
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})
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getPacket := func(pn protocol.PacketNumber) *Packet {
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if el, ok := handler.packetHistory.packetMap[pn]; ok {
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return &el.Value
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}
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return nil
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}
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expectInPacketHistory := func(expected []protocol.PacketNumber) {
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ExpectWithOffset(1, handler.packetHistory.Len()).To(Equal(len(expected)))
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for _, p := range expected {
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ExpectWithOffset(1, handler.packetHistory.packetMap).To(HaveKey(p))
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}
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}
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It("determines the packet number length", func() {
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handler.largestAcked = 0x1337
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Expect(handler.GetPacketNumberLen(0x1338)).To(Equal(protocol.PacketNumberLen2))
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Expect(handler.GetPacketNumberLen(0xfffffff)).To(Equal(protocol.PacketNumberLen4))
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})
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Context("registering sent packets", func() {
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It("accepts two consecutive packets", func() {
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 1}))
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 2}))
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Expect(handler.lastSentPacketNumber).To(Equal(protocol.PacketNumber(2)))
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expectInPacketHistory([]protocol.PacketNumber{1, 2})
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(2)))
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Expect(handler.skippedPackets).To(BeEmpty())
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})
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It("accepts packet number 0", func() {
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 0}))
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Expect(handler.lastSentPacketNumber).To(BeZero())
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 1}))
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Expect(handler.lastSentPacketNumber).To(Equal(protocol.PacketNumber(1)))
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expectInPacketHistory([]protocol.PacketNumber{0, 1})
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(2)))
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Expect(handler.skippedPackets).To(BeEmpty())
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})
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It("stores the sent time", func() {
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sendTime := time.Now().Add(-time.Minute)
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 1, SendTime: sendTime}))
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Expect(handler.lastSentRetransmittablePacketTime).To(Equal(sendTime))
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})
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It("does not store non-retransmittable packets", func() {
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handler.SentPacket(nonRetransmittablePacket(&Packet{PacketNumber: 1}))
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Expect(handler.packetHistory.Len()).To(BeZero())
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Expect(handler.lastSentRetransmittablePacketTime).To(BeZero())
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})
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Context("skipped packet numbers", func() {
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It("works with non-consecutive packet numbers", func() {
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 1}))
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 3}))
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Expect(handler.lastSentPacketNumber).To(Equal(protocol.PacketNumber(3)))
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expectInPacketHistory([]protocol.PacketNumber{1, 3})
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Expect(handler.skippedPackets).To(Equal([]protocol.PacketNumber{2}))
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})
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It("works with non-retransmittable packets", func() {
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handler.SentPacket(nonRetransmittablePacket(&Packet{PacketNumber: 1}))
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handler.SentPacket(nonRetransmittablePacket(&Packet{PacketNumber: 3}))
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Expect(handler.skippedPackets).To(Equal([]protocol.PacketNumber{2}))
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})
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It("recognizes multiple skipped packets", func() {
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 1}))
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 3}))
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 5}))
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Expect(handler.skippedPackets).To(Equal([]protocol.PacketNumber{2, 4}))
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})
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It("recognizes multiple consecutive skipped packets", func() {
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 1}))
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 4}))
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Expect(handler.skippedPackets).To(Equal([]protocol.PacketNumber{2, 3}))
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})
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It("limits the lengths of the skipped packet slice", func() {
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for i := protocol.PacketNumber(0); i < protocol.MaxTrackedSkippedPackets+5; i++ {
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 2*i + 1}))
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}
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Expect(handler.skippedPackets).To(HaveLen(protocol.MaxUndecryptablePackets))
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Expect(handler.skippedPackets[0]).To(Equal(protocol.PacketNumber(10)))
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Expect(handler.skippedPackets[protocol.MaxTrackedSkippedPackets-1]).To(Equal(protocol.PacketNumber(10 + 2*(protocol.MaxTrackedSkippedPackets-1))))
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})
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Context("garbage collection", func() {
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It("keeps all packet numbers above the LargestAcked", func() {
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handler.skippedPackets = []protocol.PacketNumber{2, 5, 8, 10}
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handler.largestAcked = 1
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handler.garbageCollectSkippedPackets()
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Expect(handler.skippedPackets).To(Equal([]protocol.PacketNumber{2, 5, 8, 10}))
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})
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It("doesn't keep packet numbers below the LargestAcked", func() {
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handler.skippedPackets = []protocol.PacketNumber{1, 5, 8, 10}
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handler.largestAcked = 5
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handler.garbageCollectSkippedPackets()
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Expect(handler.skippedPackets).To(Equal([]protocol.PacketNumber{8, 10}))
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})
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It("deletes all packet numbers if LargestAcked is sufficiently high", func() {
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handler.skippedPackets = []protocol.PacketNumber{1, 5, 10}
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handler.largestAcked = 15
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handler.garbageCollectSkippedPackets()
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Expect(handler.skippedPackets).To(BeEmpty())
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})
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})
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Context("ACK handling", func() {
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BeforeEach(func() {
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 10}))
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 12}))
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})
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It("rejects ACKs for skipped packets", func() {
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ack := createAck([]wire.AckRange{{First: 10, Last: 12}})
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err := handler.ReceivedAck(ack, 1337, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).To(MatchError("InvalidAckData: Received an ACK for a skipped packet number"))
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})
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It("accepts an ACK that correctly nacks a skipped packet", func() {
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ack := createAck([]wire.AckRange{{First: 10, Last: 10}, {First: 12, Last: 12}})
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err := handler.ReceivedAck(ack, 1337, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestAcked).ToNot(BeZero())
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})
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})
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})
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})
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Context("ACK processing", func() {
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BeforeEach(func() {
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for i := protocol.PacketNumber(0); i < 10; i++ {
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handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: i}))
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}
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// Increase RTT, because the tests would be flaky otherwise
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handler.rttStats.UpdateRTT(time.Hour, 0, time.Now())
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(10)))
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})
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Context("ACK validation", func() {
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It("accepts ACKs sent in packet 0", func() {
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ack := createAck([]wire.AckRange{{First: 0, Last: 5}})
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err := handler.ReceivedAck(ack, 0, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestAcked).To(Equal(protocol.PacketNumber(5)))
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})
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It("rejects duplicate ACKs", func() {
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ack1 := createAck([]wire.AckRange{{First: 0, Last: 3}})
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ack2 := createAck([]wire.AckRange{{First: 0, Last: 4}})
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err := handler.ReceivedAck(ack1, 1337, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestAcked).To(Equal(protocol.PacketNumber(3)))
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// this wouldn't happen in practice
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// for testing purposes, we pretend send a different ACK frame in a duplicated packet, to be able to verify that it actually doesn't get processed
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err = handler.ReceivedAck(ack2, 1337, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestAcked).To(Equal(protocol.PacketNumber(3)))
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})
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It("rejects out of order ACKs", func() {
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// acks packets 0, 1, 2, 3
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ack1 := createAck([]wire.AckRange{{First: 0, Last: 3}})
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ack2 := createAck([]wire.AckRange{{First: 0, Last: 4}})
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err := handler.ReceivedAck(ack1, 1337, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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// this wouldn't happen in practive
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// a receiver wouldn't send an ACK for a lower largest acked in a packet sent later
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err = handler.ReceivedAck(ack2, 1337-1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestAcked).To(Equal(protocol.PacketNumber(3)))
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})
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It("rejects ACKs with a too high LargestAcked packet number", func() {
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ack := createAck([]wire.AckRange{{First: 0, Last: 9999}})
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err := handler.ReceivedAck(ack, 1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).To(MatchError("InvalidAckData: Received ACK for an unsent package"))
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(10)))
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})
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It("ignores repeated ACKs", func() {
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ack := createAck([]wire.AckRange{{First: 1, Last: 3}})
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err := handler.ReceivedAck(ack, 1337, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(7)))
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err = handler.ReceivedAck(ack, 1337+1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestAcked).To(Equal(protocol.PacketNumber(3)))
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(7)))
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})
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})
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Context("acks and nacks the right packets", func() {
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It("adjusts the LargestAcked", func() {
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ack := createAck([]wire.AckRange{{First: 0, Last: 5}})
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err := handler.ReceivedAck(ack, 1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestAcked).To(Equal(protocol.PacketNumber(5)))
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expectInPacketHistory([]protocol.PacketNumber{6, 7, 8, 9})
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})
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It("acks packet 0", func() {
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ack := createAck([]wire.AckRange{{First: 0, Last: 0}})
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err := handler.ReceivedAck(ack, 1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(getPacket(0)).To(BeNil())
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expectInPacketHistory([]protocol.PacketNumber{1, 2, 3, 4, 5, 6, 7, 8, 9})
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})
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It("handles an ACK frame with one missing packet range", func() {
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ack := createAck([]wire.AckRange{{First: 1, Last: 3}, {First: 6, Last: 9}}) // lose 4 and 5
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err := handler.ReceivedAck(ack, 1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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expectInPacketHistory([]protocol.PacketNumber{0, 4, 5})
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})
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It("does not ack packets below the LowestAcked", func() {
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ack := createAck([]wire.AckRange{{First: 3, Last: 8}})
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err := handler.ReceivedAck(ack, 1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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expectInPacketHistory([]protocol.PacketNumber{0, 1, 2, 9})
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})
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It("handles an ACK with multiple missing packet ranges", func() {
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ack := createAck([]wire.AckRange{ // packets 2, 4 and 5, and 8 were lost
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{First: 9, Last: 9},
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{First: 6, Last: 7},
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{First: 3, Last: 3},
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{First: 1, Last: 1},
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})
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err := handler.ReceivedAck(ack, 1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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expectInPacketHistory([]protocol.PacketNumber{0, 2, 4, 5, 8})
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})
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It("processes an ACK frame that would be sent after a late arrival of a packet", func() {
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ack1 := createAck([]wire.AckRange{{First: 1, Last: 2}, {First: 4, Last: 6}}) // 3 lost
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err := handler.ReceivedAck(ack1, 1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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expectInPacketHistory([]protocol.PacketNumber{0, 3, 7, 8, 9})
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(5)))
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ack2 := createAck([]wire.AckRange{{First: 1, Last: 6}}) // now ack 3
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err = handler.ReceivedAck(ack2, 2, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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expectInPacketHistory([]protocol.PacketNumber{0, 7, 8, 9})
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(4)))
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})
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It("processes an ACK frame that would be sent after a late arrival of a packet and another packet", func() {
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ack1 := createAck([]wire.AckRange{{First: 0, Last: 2}, {First: 4, Last: 6}})
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err := handler.ReceivedAck(ack1, 1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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expectInPacketHistory([]protocol.PacketNumber{3, 7, 8, 9})
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(4)))
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ack2 := createAck([]wire.AckRange{{First: 1, Last: 7}})
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err = handler.ReceivedAck(ack2, 2, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(2)))
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expectInPacketHistory([]protocol.PacketNumber{8, 9})
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})
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It("processes an ACK that contains old ACK ranges", func() {
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ack1 := createAck([]wire.AckRange{{First: 1, Last: 6}})
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err := handler.ReceivedAck(ack1, 1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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expectInPacketHistory([]protocol.PacketNumber{0, 7, 8, 9})
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(4)))
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ack2 := createAck([]wire.AckRange{
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{First: 1, Last: 1},
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{First: 3, Last: 3},
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{First: 8, Last: 8},
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})
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err = handler.ReceivedAck(ack2, 2, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
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expectInPacketHistory([]protocol.PacketNumber{0, 7, 9})
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Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(3)))
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})
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})
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Context("calculating RTT", func() {
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It("computes the RTT", func() {
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now := time.Now()
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// First, fake the sent times of the first, second and last packet
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getPacket(1).SendTime = now.Add(-10 * time.Minute)
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getPacket(2).SendTime = now.Add(-5 * time.Minute)
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getPacket(6).SendTime = now.Add(-1 * time.Minute)
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// Now, check that the proper times are used when calculating the deltas
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err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 1}, 1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).NotTo(HaveOccurred())
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Expect(handler.rttStats.LatestRTT()).To(BeNumerically("~", 10*time.Minute, 1*time.Second))
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err = handler.ReceivedAck(&wire.AckFrame{LargestAcked: 2}, 2, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).NotTo(HaveOccurred())
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Expect(handler.rttStats.LatestRTT()).To(BeNumerically("~", 5*time.Minute, 1*time.Second))
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err = handler.ReceivedAck(&wire.AckFrame{LargestAcked: 6}, 3, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).NotTo(HaveOccurred())
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Expect(handler.rttStats.LatestRTT()).To(BeNumerically("~", 1*time.Minute, 1*time.Second))
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})
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It("uses the DelayTime in the ACK frame", func() {
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now := time.Now()
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// make sure the rttStats have a min RTT, so that the delay is used
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handler.rttStats.UpdateRTT(5*time.Minute, 0, time.Now())
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getPacket(1).SendTime = now.Add(-10 * time.Minute)
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err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 1, DelayTime: 5 * time.Minute}, 1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).NotTo(HaveOccurred())
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Expect(handler.rttStats.LatestRTT()).To(BeNumerically("~", 5*time.Minute, 1*time.Second))
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})
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})
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Context("determining which ACKs we have received an ACK for", func() {
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BeforeEach(func() {
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morePackets := []*Packet{
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{PacketNumber: 13, Frames: []wire.Frame{&wire.AckFrame{LowestAcked: 80, LargestAcked: 100}, &streamFrame}, Length: 1},
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{PacketNumber: 14, Frames: []wire.Frame{&wire.AckFrame{LowestAcked: 50, LargestAcked: 200}, &streamFrame}, Length: 1},
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{PacketNumber: 15, Frames: []wire.Frame{&streamFrame}, Length: 1},
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}
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for _, packet := range morePackets {
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handler.SentPacket(packet)
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}
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})
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It("determines which ACK we have received an ACK for", func() {
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err := handler.ReceivedAck(createAck([]wire.AckRange{{First: 13, Last: 15}}), 1, protocol.EncryptionForwardSecure, time.Now())
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Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.GetLowestPacketNotConfirmedAcked()).To(Equal(protocol.PacketNumber(201)))
|
|
})
|
|
|
|
It("doesn't do anything when the acked packet didn't contain an ACK", func() {
|
|
err := handler.ReceivedAck(createAck([]wire.AckRange{{First: 13, Last: 13}}), 1, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.GetLowestPacketNotConfirmedAcked()).To(Equal(protocol.PacketNumber(101)))
|
|
err = handler.ReceivedAck(createAck([]wire.AckRange{{First: 15, Last: 15}}), 2, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.GetLowestPacketNotConfirmedAcked()).To(Equal(protocol.PacketNumber(101)))
|
|
})
|
|
|
|
It("doesn't decrease the value", func() {
|
|
err := handler.ReceivedAck(createAck([]wire.AckRange{{First: 14, Last: 14}}), 1, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.GetLowestPacketNotConfirmedAcked()).To(Equal(protocol.PacketNumber(201)))
|
|
err = handler.ReceivedAck(createAck([]wire.AckRange{{First: 13, Last: 13}}), 2, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.GetLowestPacketNotConfirmedAcked()).To(Equal(protocol.PacketNumber(201)))
|
|
})
|
|
})
|
|
})
|
|
|
|
Context("ACK processing, for retransmitted packets", func() {
|
|
losePacket := func(pn protocol.PacketNumber) {
|
|
p := getPacket(pn)
|
|
ExpectWithOffset(1, p).ToNot(BeNil())
|
|
handler.queuePacketForRetransmission(p)
|
|
if p.includedInBytesInFlight {
|
|
p.includedInBytesInFlight = false
|
|
handler.bytesInFlight -= p.Length
|
|
}
|
|
r := handler.DequeuePacketForRetransmission()
|
|
ExpectWithOffset(1, r).ToNot(BeNil())
|
|
ExpectWithOffset(1, r.PacketNumber).To(Equal(pn))
|
|
}
|
|
|
|
It("sends a packet as retransmission", func() {
|
|
// packet 5 was retransmitted as packet 6
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 5, Length: 10}))
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(10)))
|
|
losePacket(5)
|
|
Expect(handler.bytesInFlight).To(BeZero())
|
|
handler.SentPacketsAsRetransmission([]*Packet{retransmittablePacket(&Packet{PacketNumber: 6, Length: 11})}, 5)
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(11)))
|
|
})
|
|
|
|
It("removes all retransmissions when the original packet is acked", func() {
|
|
// packet 5 was retransmitted as packet 6, which was then retransmitted as packet 8
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 5, Length: 10}))
|
|
losePacket(5)
|
|
handler.SentPacketsAsRetransmission([]*Packet{retransmittablePacket(&Packet{PacketNumber: 6, Length: 11})}, 5)
|
|
losePacket(6)
|
|
handler.SentPacketsAsRetransmission([]*Packet{retransmittablePacket(&Packet{PacketNumber: 8, Length: 12})}, 6)
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(12)))
|
|
// ack 5
|
|
err := handler.ReceivedAck(&wire.AckFrame{LowestAcked: 5, LargestAcked: 5}, 1, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.packetHistory.Len()).To(BeZero())
|
|
Expect(handler.bytesInFlight).To(BeZero())
|
|
})
|
|
|
|
It("removes all retransmissions when the retransmission is acked", func() {
|
|
// the retransmission for packet 5 was split into packets 6 and 8
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 5, Length: 10}))
|
|
losePacket(5)
|
|
handler.SentPacketsAsRetransmission([]*Packet{retransmittablePacket(&Packet{PacketNumber: 6, Length: 11})}, 5)
|
|
losePacket(6)
|
|
handler.SentPacketsAsRetransmission([]*Packet{retransmittablePacket(&Packet{PacketNumber: 8, Length: 12})}, 6)
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(12)))
|
|
// ack 8
|
|
err := handler.ReceivedAck(&wire.AckFrame{LowestAcked: 8, LargestAcked: 8}, 1, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.packetHistory.Len()).To(BeZero())
|
|
Expect(handler.bytesInFlight).To(BeZero())
|
|
})
|
|
|
|
It("removes split retransmissions when the original packet is acked", func() {
|
|
// the retransmission for packet 5 was split into 8 and 9
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 5, Length: 10}))
|
|
losePacket(5)
|
|
handler.SentPacketsAsRetransmission([]*Packet{
|
|
retransmittablePacket(&Packet{PacketNumber: 8, Length: 6}),
|
|
retransmittablePacket(&Packet{PacketNumber: 9, Length: 7}),
|
|
}, 5)
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(6 + 7)))
|
|
// ack 5
|
|
err := handler.ReceivedAck(&wire.AckFrame{LowestAcked: 5, LargestAcked: 5}, 1, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.packetHistory.Len()).To(BeZero())
|
|
Expect(handler.bytesInFlight).To(BeZero())
|
|
})
|
|
|
|
It("doesn't remove the original packet if a split retransmission is acked", func() {
|
|
// the retransmission for packet 5 was split into 10 and 12
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 5, Length: 10}))
|
|
losePacket(5)
|
|
handler.SentPacketsAsRetransmission([]*Packet{
|
|
retransmittablePacket(&Packet{PacketNumber: 10, Length: 6}),
|
|
retransmittablePacket(&Packet{PacketNumber: 12, Length: 7})},
|
|
5)
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(6 + 7)))
|
|
// ack 10
|
|
err := handler.ReceivedAck(&wire.AckFrame{LowestAcked: 10, LargestAcked: 10}, 1, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(7)))
|
|
expectInPacketHistory([]protocol.PacketNumber{5, 12})
|
|
})
|
|
|
|
It("handles ACKs that ack the original packet as well as the retransmission", func() {
|
|
// packet 5 was retransmitted as packet 7
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 5, Length: 10}))
|
|
losePacket(5)
|
|
handler.SentPacketsAsRetransmission([]*Packet{retransmittablePacket(&Packet{PacketNumber: 7, Length: 11})}, 5)
|
|
// ack 5 and 7
|
|
ack := createAck([]wire.AckRange{{First: 5, Last: 5}, {First: 7, Last: 7}})
|
|
err := handler.ReceivedAck(ack, 1, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.packetHistory.Len()).To(BeZero())
|
|
Expect(handler.bytesInFlight).To(BeZero())
|
|
})
|
|
})
|
|
|
|
Context("Retransmission handling", func() {
|
|
It("does not dequeue a packet if no ack has been received", func() {
|
|
handler.SentPacket(&Packet{PacketNumber: 1})
|
|
Expect(handler.DequeuePacketForRetransmission()).To(BeNil())
|
|
})
|
|
|
|
Context("STOP_WAITINGs", func() {
|
|
It("gets a STOP_WAITING frame", func() {
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 1}))
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 2}))
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 3}))
|
|
ack := wire.AckFrame{LargestAcked: 3, LowestAcked: 3}
|
|
err := handler.ReceivedAck(&ack, 2, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).ToNot(HaveOccurred())
|
|
Expect(handler.GetStopWaitingFrame(false)).To(Equal(&wire.StopWaitingFrame{LeastUnacked: 4}))
|
|
})
|
|
|
|
It("gets a STOP_WAITING frame after queueing a retransmission", func() {
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 5}))
|
|
handler.queuePacketForRetransmission(getPacket(5))
|
|
Expect(handler.GetStopWaitingFrame(false)).To(Equal(&wire.StopWaitingFrame{LeastUnacked: 6}))
|
|
})
|
|
})
|
|
})
|
|
|
|
Context("congestion", func() {
|
|
var cong *mocks.MockSendAlgorithm
|
|
|
|
BeforeEach(func() {
|
|
cong = mocks.NewMockSendAlgorithm(mockCtrl)
|
|
cong.EXPECT().RetransmissionDelay().AnyTimes()
|
|
handler.congestion = cong
|
|
})
|
|
|
|
It("should call OnSent", func() {
|
|
cong.EXPECT().OnPacketSent(
|
|
gomock.Any(),
|
|
protocol.ByteCount(42),
|
|
protocol.PacketNumber(1),
|
|
protocol.ByteCount(42),
|
|
true,
|
|
)
|
|
cong.EXPECT().TimeUntilSend(gomock.Any())
|
|
p := &Packet{
|
|
PacketNumber: 1,
|
|
Length: 42,
|
|
Frames: []wire.Frame{&wire.PingFrame{}},
|
|
}
|
|
handler.SentPacket(p)
|
|
})
|
|
|
|
It("should call MaybeExitSlowStart and OnPacketAcked", func() {
|
|
cong.EXPECT().OnPacketSent(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Times(3)
|
|
cong.EXPECT().TimeUntilSend(gomock.Any()).Times(3)
|
|
gomock.InOrder(
|
|
cong.EXPECT().MaybeExitSlowStart(), // must be called before packets are acked
|
|
cong.EXPECT().OnPacketAcked(protocol.PacketNumber(1), protocol.ByteCount(1), protocol.ByteCount(2)),
|
|
cong.EXPECT().OnPacketAcked(protocol.PacketNumber(2), protocol.ByteCount(1), protocol.ByteCount(1)),
|
|
)
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 1}))
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 2}))
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 3}))
|
|
err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 2, LowestAcked: 1}, 1, protocol.EncryptionForwardSecure, time.Now())
|
|
Expect(err).NotTo(HaveOccurred())
|
|
})
|
|
|
|
It("should call MaybeExitSlowStart and OnPacketLost", func() {
|
|
cong.EXPECT().OnPacketSent(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).Times(3)
|
|
cong.EXPECT().TimeUntilSend(gomock.Any()).Times(3)
|
|
cong.EXPECT().OnRetransmissionTimeout(true).Times(2)
|
|
cong.EXPECT().OnPacketLost(
|
|
protocol.PacketNumber(1),
|
|
protocol.ByteCount(1),
|
|
protocol.ByteCount(3),
|
|
)
|
|
cong.EXPECT().OnPacketLost(
|
|
protocol.PacketNumber(2),
|
|
protocol.ByteCount(1),
|
|
protocol.ByteCount(3),
|
|
)
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 1}))
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 2}))
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 3}))
|
|
handler.OnAlarm() // RTO, meaning 2 lost packets
|
|
})
|
|
|
|
It("only allows sending of ACKs when congestion limited", func() {
|
|
handler.bytesInFlight = 100
|
|
cong.EXPECT().GetCongestionWindow().Return(protocol.ByteCount(200))
|
|
Expect(handler.SendMode()).To(Equal(SendAny))
|
|
cong.EXPECT().GetCongestionWindow().Return(protocol.ByteCount(75))
|
|
Expect(handler.SendMode()).To(Equal(SendAck))
|
|
})
|
|
|
|
It("only allows sending of ACKs when we're keeping track of MaxOutstandingSentPackets packets", func() {
|
|
cong.EXPECT().GetCongestionWindow().Return(protocol.MaxByteCount).AnyTimes()
|
|
cong.EXPECT().TimeUntilSend(gomock.Any()).AnyTimes()
|
|
cong.EXPECT().OnPacketSent(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any()).AnyTimes()
|
|
for i := protocol.PacketNumber(1); i < protocol.MaxOutstandingSentPackets; i++ {
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: i}))
|
|
Expect(handler.SendMode()).To(Equal(SendAny))
|
|
}
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: protocol.MaxOutstandingSentPackets}))
|
|
Expect(handler.SendMode()).To(Equal(SendAck))
|
|
})
|
|
|
|
It("allows sending retransmissions", func() {
|
|
// note that we don't EXPECT a call to GetCongestionWindow
|
|
// that means retransmissions are sent without considering the congestion window
|
|
handler.retransmissionQueue = []*Packet{{PacketNumber: 3}}
|
|
Expect(handler.SendMode()).To(Equal(SendRetransmission))
|
|
})
|
|
|
|
It("allow retransmissions, if we're keeping track of between MaxOutstandingSentPackets and MaxTrackedSentPackets packets", func() {
|
|
Expect(protocol.MaxOutstandingSentPackets).To(BeNumerically("<", protocol.MaxTrackedSentPackets))
|
|
handler.retransmissionQueue = make([]*Packet, protocol.MaxOutstandingSentPackets+10)
|
|
Expect(handler.SendMode()).To(Equal(SendRetransmission))
|
|
handler.retransmissionQueue = make([]*Packet, protocol.MaxTrackedSentPackets)
|
|
Expect(handler.SendMode()).To(Equal(SendNone))
|
|
})
|
|
|
|
It("gets the pacing delay", func() {
|
|
sendTime := time.Now().Add(-time.Minute)
|
|
handler.bytesInFlight = 100
|
|
cong.EXPECT().OnPacketSent(gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any(), gomock.Any())
|
|
cong.EXPECT().TimeUntilSend(protocol.ByteCount(100)).Return(time.Hour)
|
|
handler.SentPacket(&Packet{PacketNumber: 1, SendTime: sendTime})
|
|
Expect(handler.TimeUntilSend()).To(Equal(sendTime.Add(time.Hour)))
|
|
})
|
|
|
|
It("allows sending of one packet, if it should be sent immediately", func() {
|
|
cong.EXPECT().TimeUntilSend(gomock.Any()).Return(time.Duration(0))
|
|
Expect(handler.ShouldSendNumPackets()).To(Equal(1))
|
|
})
|
|
|
|
It("allows sending of multiple packets, if the pacing delay is smaller than the minimum", func() {
|
|
pacingDelay := protocol.MinPacingDelay / 10
|
|
cong.EXPECT().TimeUntilSend(gomock.Any()).Return(pacingDelay)
|
|
Expect(handler.ShouldSendNumPackets()).To(Equal(10))
|
|
})
|
|
|
|
It("allows sending of multiple packets, if the pacing delay is smaller than the minimum, and not a fraction", func() {
|
|
pacingDelay := protocol.MinPacingDelay * 2 / 5
|
|
cong.EXPECT().TimeUntilSend(gomock.Any()).Return(pacingDelay)
|
|
Expect(handler.ShouldSendNumPackets()).To(Equal(3))
|
|
})
|
|
})
|
|
|
|
Context("RTOs", func() {
|
|
It("uses default RTO", func() {
|
|
Expect(handler.computeRTOTimeout()).To(Equal(defaultRTOTimeout))
|
|
})
|
|
|
|
It("uses RTO from rttStats", func() {
|
|
rtt := time.Second
|
|
expected := rtt + rtt/2*4
|
|
handler.rttStats.UpdateRTT(rtt, 0, time.Now())
|
|
Expect(handler.computeRTOTimeout()).To(Equal(expected))
|
|
})
|
|
|
|
It("limits RTO min", func() {
|
|
rtt := time.Millisecond
|
|
handler.rttStats.UpdateRTT(rtt, 0, time.Now())
|
|
Expect(handler.computeRTOTimeout()).To(Equal(minRTOTimeout))
|
|
})
|
|
|
|
It("limits RTO max", func() {
|
|
rtt := time.Hour
|
|
handler.rttStats.UpdateRTT(rtt, 0, time.Now())
|
|
Expect(handler.computeRTOTimeout()).To(Equal(maxRTOTimeout))
|
|
})
|
|
|
|
It("implements exponential backoff", func() {
|
|
handler.rtoCount = 0
|
|
Expect(handler.computeRTOTimeout()).To(Equal(defaultRTOTimeout))
|
|
handler.rtoCount = 1
|
|
Expect(handler.computeRTOTimeout()).To(Equal(2 * defaultRTOTimeout))
|
|
handler.rtoCount = 2
|
|
Expect(handler.computeRTOTimeout()).To(Equal(4 * defaultRTOTimeout))
|
|
})
|
|
|
|
It("queues two packets if RTO expires", func() {
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 1}))
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 2}))
|
|
|
|
handler.rttStats.UpdateRTT(time.Hour, 0, time.Now())
|
|
Expect(handler.lossTime.IsZero()).To(BeTrue())
|
|
Expect(time.Until(handler.GetAlarmTimeout())).To(BeNumerically("~", handler.computeRTOTimeout(), time.Minute))
|
|
|
|
handler.OnAlarm()
|
|
p := handler.DequeuePacketForRetransmission()
|
|
Expect(p).ToNot(BeNil())
|
|
Expect(p.PacketNumber).To(Equal(protocol.PacketNumber(1)))
|
|
p = handler.DequeuePacketForRetransmission()
|
|
Expect(p).ToNot(BeNil())
|
|
Expect(p.PacketNumber).To(Equal(protocol.PacketNumber(2)))
|
|
Expect(handler.bytesInFlight).To(Equal(protocol.ByteCount(2)))
|
|
|
|
Expect(handler.rtoCount).To(BeEquivalentTo(1))
|
|
})
|
|
})
|
|
|
|
Context("Delay-based loss detection", func() {
|
|
It("immediately detects old packets as lost when receiving an ACK", func() {
|
|
now := time.Now()
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 1, SendTime: now.Add(-time.Hour)}))
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 2, SendTime: now.Add(-time.Second)}))
|
|
Expect(handler.lossTime.IsZero()).To(BeTrue())
|
|
|
|
err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 2, LowestAcked: 2}, 1, protocol.EncryptionForwardSecure, now)
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(handler.DequeuePacketForRetransmission()).ToNot(BeNil())
|
|
// no need to set an alarm, since packet 1 was already declared lost
|
|
Expect(handler.lossTime.IsZero()).To(BeTrue())
|
|
})
|
|
|
|
It("sets the early retransmit alarm", func() {
|
|
now := time.Now()
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 1, SendTime: now.Add(-2 * time.Second)}))
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 2, SendTime: now.Add(-2 * time.Second)}))
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 3, SendTime: now.Add(-time.Second)}))
|
|
Expect(handler.lossTime.IsZero()).To(BeTrue())
|
|
|
|
err := handler.ReceivedAck(&wire.AckFrame{LargestAcked: 2, LowestAcked: 2}, 1, protocol.EncryptionForwardSecure, now.Add(-time.Second))
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(handler.rttStats.SmoothedRTT()).To(Equal(time.Second))
|
|
|
|
// Packet 1 should be considered lost (1+1/8) RTTs after it was sent.
|
|
Expect(handler.lossTime.IsZero()).To(BeFalse())
|
|
Expect(handler.lossTime.Sub(getPacket(1).SendTime)).To(Equal(time.Second * 9 / 8))
|
|
// Expect(time.Until(handler.GetAlarmTimeout())).To(BeNumerically("~", time.Hour*9/8, time.Minute))
|
|
|
|
handler.OnAlarm()
|
|
Expect(handler.DequeuePacketForRetransmission()).NotTo(BeNil())
|
|
// make sure this is not an RTO: only packet 1 is retransmissted
|
|
Expect(handler.DequeuePacketForRetransmission()).To(BeNil())
|
|
})
|
|
})
|
|
|
|
Context("handshake packets", func() {
|
|
BeforeEach(func() {
|
|
handler.handshakeComplete = false
|
|
})
|
|
|
|
It("detects the handshake timeout", func() {
|
|
now := time.Now()
|
|
sendTime := now.Add(-time.Minute)
|
|
lastHandshakePacketSendTime := now.Add(-30 * time.Second)
|
|
// send handshake packets: 1, 2, 4
|
|
// send a forward-secure packet: 3
|
|
handler.SentPacket(handshakePacket(&Packet{PacketNumber: 1, SendTime: sendTime}))
|
|
handler.SentPacket(handshakePacket(&Packet{PacketNumber: 2, SendTime: sendTime}))
|
|
handler.SentPacket(retransmittablePacket(&Packet{PacketNumber: 3, SendTime: sendTime}))
|
|
handler.SentPacket(handshakePacket(&Packet{PacketNumber: 4, SendTime: lastHandshakePacketSendTime}))
|
|
|
|
err := handler.ReceivedAck(createAck([]wire.AckRange{{First: 1, Last: 1}}), 1, protocol.EncryptionForwardSecure, now)
|
|
// RTT is now 1 minute
|
|
Expect(handler.rttStats.SmoothedRTT()).To(Equal(time.Minute))
|
|
Expect(err).NotTo(HaveOccurred())
|
|
Expect(handler.lossTime.IsZero()).To(BeTrue())
|
|
Expect(handler.GetAlarmTimeout().Sub(lastHandshakePacketSendTime)).To(Equal(2 * time.Minute))
|
|
|
|
handler.OnAlarm()
|
|
p := handler.DequeuePacketForRetransmission()
|
|
Expect(p).ToNot(BeNil())
|
|
Expect(p.PacketNumber).To(Equal(protocol.PacketNumber(2)))
|
|
p = handler.DequeuePacketForRetransmission()
|
|
Expect(p).ToNot(BeNil())
|
|
Expect(p.PacketNumber).To(Equal(protocol.PacketNumber(4)))
|
|
Expect(getPacket(3)).ToNot(BeNil())
|
|
Expect(handler.handshakeCount).To(BeEquivalentTo(1))
|
|
// make sure the exponential backoff is used
|
|
Expect(handler.GetAlarmTimeout().Sub(lastHandshakePacketSendTime)).To(Equal(4 * time.Minute))
|
|
})
|
|
|
|
It("rejects an ACK that acks packets with a higher encryption level", func() {
|
|
handler.SentPacket(&Packet{
|
|
PacketNumber: 13,
|
|
EncryptionLevel: protocol.EncryptionForwardSecure,
|
|
Frames: []wire.Frame{&streamFrame},
|
|
Length: 1,
|
|
})
|
|
ack := createAck([]wire.AckRange{{First: 13, Last: 13}})
|
|
err := handler.ReceivedAck(ack, 1, protocol.EncryptionSecure, time.Now())
|
|
Expect(err).To(MatchError("Received ACK with encryption level encrypted (not forward-secure) that acks a packet 13 (encryption level forward-secure)"))
|
|
})
|
|
|
|
It("deletes non forward-secure packets when the handshake completes", func() {
|
|
for i := protocol.PacketNumber(1); i <= 6; i++ {
|
|
p := retransmittablePacket(&Packet{PacketNumber: i})
|
|
p.EncryptionLevel = protocol.EncryptionSecure
|
|
handler.SentPacket(p)
|
|
}
|
|
handler.queuePacketForRetransmission(getPacket(1))
|
|
handler.queuePacketForRetransmission(getPacket(3))
|
|
handler.SetHandshakeComplete()
|
|
Expect(handler.packetHistory.Len()).To(BeZero())
|
|
packet := handler.DequeuePacketForRetransmission()
|
|
Expect(packet).To(BeNil())
|
|
})
|
|
})
|
|
})
|