congestion

type AckedPacketInfo struct {
	PacketNumber PacketNumber
	BytesAcked   ByteCount
	ReceivedTime time.Time
}

type ByteCount protocol.ByteCount

type CongestionControl interface {
	SetRTTStatsProvider(provider RTTStatsProvider)
	TimeUntilSend(bytesInFlight ByteCount) time.Time
	HasPacingBudget(now time.Time) bool
	OnPacketSent(sentTime time.Time, bytesInFlight ByteCount, packetNumber PacketNumber, bytes ByteCount, isRetransmittable bool)
	CanSend(bytesInFlight ByteCount) bool
	MaybeExitSlowStart()
	OnPacketAcked(number PacketNumber, ackedBytes ByteCount, priorInFlight ByteCount, eventTime time.Time)
	OnCongestionEvent(number PacketNumber, lostBytes ByteCount, priorInFlight ByteCount)
	OnCongestionEventEx(priorInFlight ByteCount, eventTime time.Time, ackedPackets []AckedPacketInfo, lostPackets []LostPacketInfo)
	OnRetransmissionTimeout(packetsRetransmitted bool)
	SetMaxDatagramSize(size ByteCount)
	InSlowStart() bool
	InRecovery() bool
	GetCongestionWindow() ByteCount
}

type LostPacketInfo struct {
	PacketNumber PacketNumber
	BytesLost    ByteCount
}

type PacketNumber protocol.PacketNumber

type RTTStatsProvider interface {
	MinRTT() time.Duration
	LatestRTT() time.Duration
	SmoothedRTT() time.Duration
	MeanDeviation() time.Duration
	MaxAckDelay() time.Duration
	PTO(includeMaxAckDelay bool) time.Duration
	UpdateRTT(sendDelta, ackDelay time.Duration)
	SetMaxAckDelay(mad time.Duration)
	SetInitialRTT(t time.Duration)
}