mirror of
https://github.com/refraction-networking/uquic.git
synced 2025-04-04 12:47:36 +03:00
314 lines
13 KiB
Go
314 lines
13 KiB
Go
package ackhandler
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import (
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"time"
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"github.com/lucas-clemente/quic-go/frames"
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"github.com/lucas-clemente/quic-go/protocol"
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. "github.com/onsi/ginkgo"
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. "github.com/onsi/gomega"
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)
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var _ = Describe("receivedPacketHandler", func() {
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var (
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handler *receivedPacketHandler
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)
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BeforeEach(func() {
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handler = NewReceivedPacketHandler().(*receivedPacketHandler)
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})
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Context("accepting packets", func() {
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It("handles a packet that arrives late", func() {
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err := handler.ReceivedPacket(protocol.PacketNumber(1), false)
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.receivedTimes).To(HaveKey(protocol.PacketNumber(1)))
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err = handler.ReceivedPacket(protocol.PacketNumber(3), false)
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.receivedTimes).To(HaveKey(protocol.PacketNumber(3)))
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err = handler.ReceivedPacket(protocol.PacketNumber(2), false)
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.receivedTimes).To(HaveKey(protocol.PacketNumber(2)))
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})
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It("rejects packets with packet number 0", func() {
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err := handler.ReceivedPacket(protocol.PacketNumber(0), false)
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Expect(err).To(MatchError(errInvalidPacketNumber))
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})
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It("rejects a duplicate package with PacketNumber equal to LargestObserved", func() {
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for i := 1; i < 5; i++ {
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err := handler.ReceivedPacket(protocol.PacketNumber(i), false)
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Expect(err).ToNot(HaveOccurred())
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}
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err := handler.ReceivedPacket(4, false)
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Expect(err).To(MatchError(ErrDuplicatePacket))
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})
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It("rejects a duplicate package with PacketNumber less than the LargestObserved", func() {
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for i := 1; i < 5; i++ {
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err := handler.ReceivedPacket(protocol.PacketNumber(i), false)
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Expect(err).ToNot(HaveOccurred())
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}
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err := handler.ReceivedPacket(2, false)
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Expect(err).To(MatchError(ErrDuplicatePacket))
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})
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It("ignores a packet with PacketNumber less than the LeastUnacked of a previously received StopWaiting", func() {
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err := handler.ReceivedPacket(5, false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: 10})
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedPacket(9, false)
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Expect(err).To(MatchError(ErrPacketSmallerThanLastStopWaiting))
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Expect(handler.largestInOrderObserved).To(Equal(protocol.PacketNumber(9)))
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})
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It("does not ignore a packet with PacketNumber equal to LeastUnacked of a previously received StopWaiting", func() {
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err := handler.ReceivedPacket(5, false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: 10})
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedPacket(10, false)
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestInOrderObserved).To(Equal(protocol.PacketNumber(10)))
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})
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It("saves the time when each packet arrived", func() {
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err := handler.ReceivedPacket(protocol.PacketNumber(3), false)
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.receivedTimes).To(HaveKey(protocol.PacketNumber(3)))
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Expect(handler.receivedTimes[3]).To(BeTemporally("~", time.Now(), 10*time.Millisecond))
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})
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It("doesn't store more than MaxTrackedReceivedPackets packets", func() {
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for i := uint32(0); i < protocol.MaxTrackedReceivedPackets; i++ {
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packetNumber := protocol.PacketNumber(1 + 2*i)
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err := handler.ReceivedPacket(packetNumber, false)
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Expect(err).ToNot(HaveOccurred())
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}
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err := handler.ReceivedPacket(protocol.PacketNumber(3*protocol.MaxTrackedReceivedPackets), false)
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Expect(err).To(MatchError(errTooManyOutstandingReceivedPackets))
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})
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})
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Context("handling STOP_WAITING frames", func() {
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It("increases the largestInOrderObserved packet number", func() {
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// We simulate 20 packets, numbers 10, 11 and 12 lost
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for i := 1; i < 20; i++ {
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if i == 10 || i == 11 || i == 12 {
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continue
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}
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err := handler.ReceivedPacket(protocol.PacketNumber(i), false)
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Expect(err).ToNot(HaveOccurred())
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}
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err := handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: protocol.PacketNumber(12)})
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestInOrderObserved).To(Equal(protocol.PacketNumber(11)))
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})
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It("increases the ignorePacketsBelow number", func() {
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err := handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: protocol.PacketNumber(12)})
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.ignorePacketsBelow).To(Equal(protocol.PacketNumber(11)))
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})
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It("increase the ignorePacketsBelow number, even if all packets below the LeastUnacked were already acked", func() {
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for i := 1; i < 20; i++ {
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err := handler.ReceivedPacket(protocol.PacketNumber(i), false)
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Expect(err).ToNot(HaveOccurred())
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}
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Expect(handler.largestInOrderObserved).To(Equal(protocol.PacketNumber(19)))
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err := handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: protocol.PacketNumber(12)})
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.ignorePacketsBelow).To(Equal(protocol.PacketNumber(11)))
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})
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It("does not decrease the ignorePacketsBelow number when an out-of-order StopWaiting arrives", func() {
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err := handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: protocol.PacketNumber(12)})
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.ignorePacketsBelow).To(Equal(protocol.PacketNumber(11)))
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err = handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: protocol.PacketNumber(6)})
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.ignorePacketsBelow).To(Equal(protocol.PacketNumber(11)))
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})
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})
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Context("ACK package generation", func() {
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It("generates a simple ACK frame", func() {
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err := handler.ReceivedPacket(protocol.PacketNumber(1), false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedPacket(protocol.PacketNumber(2), false)
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Expect(err).ToNot(HaveOccurred())
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ack, err := handler.GetAckFrame(true)
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Expect(err).ToNot(HaveOccurred())
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Expect(ack.LargestAcked).To(Equal(protocol.PacketNumber(2)))
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Expect(ack.LowestAcked).To(Equal(protocol.PacketNumber(1)))
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Expect(ack.AckRanges).To(BeEmpty())
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})
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It("generates an ACK frame with missing packets", func() {
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err := handler.ReceivedPacket(protocol.PacketNumber(1), false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedPacket(protocol.PacketNumber(4), false)
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Expect(err).ToNot(HaveOccurred())
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ack, err := handler.GetAckFrame(true)
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Expect(err).ToNot(HaveOccurred())
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Expect(ack.LargestAcked).To(Equal(protocol.PacketNumber(4)))
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Expect(ack.LowestAcked).To(Equal(protocol.PacketNumber(1)))
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Expect(ack.AckRanges).To(HaveLen(2))
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Expect(ack.AckRanges[0]).To(Equal(frames.AckRange{FirstPacketNumber: 4, LastPacketNumber: 4}))
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Expect(ack.AckRanges[1]).To(Equal(frames.AckRange{FirstPacketNumber: 1, LastPacketNumber: 1}))
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})
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It("does not generate an ACK if an ACK has already been sent for the largest Packet", func() {
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err := handler.ReceivedPacket(protocol.PacketNumber(1), false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedPacket(protocol.PacketNumber(2), false)
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Expect(err).ToNot(HaveOccurred())
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ack, err := handler.GetAckFrame(true)
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Expect(err).ToNot(HaveOccurred())
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Expect(ack).ToNot(BeNil())
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ack, err = handler.GetAckFrame(true)
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Expect(err).ToNot(HaveOccurred())
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Expect(ack).To(BeNil())
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})
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It("does not dequeue an ACK frame if told so", func() {
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err := handler.ReceivedPacket(protocol.PacketNumber(2), false)
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Expect(err).ToNot(HaveOccurred())
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ack, err := handler.GetAckFrame(false)
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Expect(err).ToNot(HaveOccurred())
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Expect(ack).ToNot(BeNil())
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ack, err = handler.GetAckFrame(false)
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Expect(err).ToNot(HaveOccurred())
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Expect(ack).ToNot(BeNil())
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ack, err = handler.GetAckFrame(false)
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Expect(err).ToNot(HaveOccurred())
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Expect(ack).ToNot(BeNil())
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})
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It("returns a cached ACK frame if the ACK was not dequeued", func() {
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err := handler.ReceivedPacket(protocol.PacketNumber(2), false)
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Expect(err).ToNot(HaveOccurred())
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ack, err := handler.GetAckFrame(false)
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Expect(err).ToNot(HaveOccurred())
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Expect(ack).ToNot(BeNil())
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ack2, err := handler.GetAckFrame(false)
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Expect(err).ToNot(HaveOccurred())
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Expect(ack2).ToNot(BeNil())
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Expect(&ack).To(Equal(&ack2))
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})
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It("generates a new ACK (and deletes the cached one) when a new packet arrives", func() {
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err := handler.ReceivedPacket(protocol.PacketNumber(1), false)
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Expect(err).ToNot(HaveOccurred())
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ack, _ := handler.GetAckFrame(true)
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Expect(ack).ToNot(BeNil())
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Expect(ack.LargestAcked).To(Equal(protocol.PacketNumber(1)))
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err = handler.ReceivedPacket(protocol.PacketNumber(3), false)
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Expect(err).ToNot(HaveOccurred())
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ack, _ = handler.GetAckFrame(true)
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Expect(ack).ToNot(BeNil())
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Expect(ack.LargestAcked).To(Equal(protocol.PacketNumber(3)))
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})
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It("generates a new ACK when an out-of-order packet arrives", func() {
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err := handler.ReceivedPacket(protocol.PacketNumber(1), false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedPacket(protocol.PacketNumber(3), false)
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Expect(err).ToNot(HaveOccurred())
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ack, _ := handler.GetAckFrame(true)
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Expect(ack).ToNot(BeNil())
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Expect(ack.AckRanges).To(HaveLen(2))
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err = handler.ReceivedPacket(protocol.PacketNumber(2), false)
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Expect(err).ToNot(HaveOccurred())
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ack, _ = handler.GetAckFrame(true)
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Expect(ack).ToNot(BeNil())
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Expect(ack.AckRanges).To(BeEmpty())
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})
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It("doesn't send old ACK ranges after receiving a StopWaiting", func() {
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err := handler.ReceivedPacket(5, false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedPacket(10, false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedPacket(11, false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedPacket(12, false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: protocol.PacketNumber(11)})
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Expect(err).ToNot(HaveOccurred())
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ack, err := handler.GetAckFrame(true)
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Expect(err).ToNot(HaveOccurred())
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Expect(ack).ToNot(BeNil())
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Expect(ack.LargestAcked).To(Equal(protocol.PacketNumber(12)))
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Expect(ack.LowestAcked).To(Equal(protocol.PacketNumber(11)))
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Expect(ack.HasMissingRanges()).To(BeFalse())
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})
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It("deletes packets from the packetHistory after receiving a StopWaiting, after continously received packets", func() {
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for i := 1; i <= 12; i++ {
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err := handler.ReceivedPacket(protocol.PacketNumber(i), false)
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Expect(err).ToNot(HaveOccurred())
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}
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err := handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: protocol.PacketNumber(6)})
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.largestInOrderObserved).To(Equal(protocol.PacketNumber(12)))
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// check that the packets were deleted from the receivedPacketHistory by checking the values in an ACK frame
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ack, err := handler.GetAckFrame(true)
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Expect(err).ToNot(HaveOccurred())
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Expect(ack).ToNot(BeNil())
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Expect(ack.LargestAcked).To(Equal(protocol.PacketNumber(12)))
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Expect(ack.LowestAcked).To(Equal(protocol.PacketNumber(6)))
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Expect(ack.HasMissingRanges()).To(BeFalse())
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})
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})
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Context("Garbage Collector", func() {
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It("garbage collects receivedTimes after receiving a StopWaiting, if there are no missing packets", func() {
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for i := 1; i <= 4; i++ {
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err := handler.ReceivedPacket(protocol.PacketNumber(i), false)
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Expect(err).ToNot(HaveOccurred())
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}
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err := handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: 3})
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.receivedTimes).ToNot(HaveKey(protocol.PacketNumber(1)))
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Expect(handler.receivedTimes).ToNot(HaveKey(protocol.PacketNumber(2)))
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Expect(handler.receivedTimes).To(HaveKey(protocol.PacketNumber(3)))
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Expect(handler.receivedTimes).To(HaveKey(protocol.PacketNumber(4)))
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Expect(handler.lowestInReceivedTimes).To(Equal(protocol.PacketNumber(3)))
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})
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It("garbage collects the receivedTimes after receiving multiple StopWaitings", func() {
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for i := 1; i <= 9; i++ {
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err := handler.ReceivedPacket(protocol.PacketNumber(i), false)
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Expect(err).ToNot(HaveOccurred())
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}
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err := handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: 4})
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: 8})
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.receivedTimes).To(HaveLen(2)) // packets 8 and 9
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Expect(handler.receivedTimes).To(HaveKey(protocol.PacketNumber(8)))
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Expect(handler.receivedTimes).To(HaveKey(protocol.PacketNumber(9)))
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Expect(handler.lowestInReceivedTimes).To(Equal(protocol.PacketNumber(8)))
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})
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It("garbage collects receivedTimes after receiving a StopWaiting, if there are missing packets", func() {
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err := handler.ReceivedPacket(1, false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedPacket(2, false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedPacket(4, false)
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Expect(err).ToNot(HaveOccurred())
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err = handler.ReceivedStopWaiting(&frames.StopWaitingFrame{LeastUnacked: 4})
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Expect(err).ToNot(HaveOccurred())
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Expect(handler.receivedTimes).ToNot(HaveKey(protocol.PacketNumber(1)))
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Expect(handler.receivedTimes).ToNot(HaveKey(protocol.PacketNumber(2)))
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Expect(handler.receivedTimes).To(HaveKey(protocol.PacketNumber(4)))
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Expect(handler.lowestInReceivedTimes).To(Equal(protocol.PacketNumber(4)))
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})
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})
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})
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