ackhandler

Documentation

Index

• func HasAckElicitingFrames(fs []Frame) bool
• func IsFrameAckEliciting(f wire.Frame) bool
• func NewAckHandler(initialPacketNumber protocol.PacketNumber, ...) (SentPacketHandler, ReceivedPacketHandler)
• type Frame
• type FrameHandler
• type ReceivedPacketHandler
• type SendMode
  • func (s SendMode) String() string
• type SentPacketHandler
• type StreamFrame

Functions

func HasAckElicitingFrames

func HasAckElicitingFrames(fs []Frame) bool

HasAckElicitingFrames returns true if at least one frame is ack-eliciting.

func IsFrameAckEliciting

func IsFrameAckEliciting(f wire.Frame) bool

IsFrameAckEliciting returns true if the frame is ack-eliciting.

func NewAckHandler

func NewAckHandler(
	initialPacketNumber protocol.PacketNumber,
	initialMaxDatagramSize protocol.ByteCount,
	rttStats *utils.RTTStats,
	clientAddressValidated bool,
	enableECN bool,
	pers protocol.Perspective,
	tracer *logging.ConnectionTracer,
	logger utils.Logger,
) (SentPacketHandler, ReceivedPacketHandler)

NewAckHandler creates a new SentPacketHandler and a new ReceivedPacketHandler. clientAddressValidated indicates whether the address was validated beforehand by an address validation token. clientAddressValidated has no effect for a client.

Types

type Frame

type Frame struct {
	Frame   wire.Frame // nil if the frame has already been acknowledged in another packet
	Handler FrameHandler
}

type FrameHandler

type FrameHandler interface {
	OnAcked(wire.Frame)
	OnLost(wire.Frame)
}

FrameHandler handles the acknowledgement and the loss of a frame.

type ReceivedPacketHandler

type ReceivedPacketHandler interface {
	IsPotentiallyDuplicate(protocol.PacketNumber, protocol.EncryptionLevel) bool
	ReceivedPacket(pn protocol.PacketNumber, ecn protocol.ECN, encLevel protocol.EncryptionLevel, rcvTime time.Time, ackEliciting bool) error
	DropPackets(protocol.EncryptionLevel)

	GetAlarmTimeout() time.Time
	GetAckFrame(encLevel protocol.EncryptionLevel, onlyIfQueued bool) *wire.AckFrame
}

ReceivedPacketHandler handles ACKs needed to send for incoming packets

type SendMode

type SendMode uint8

The SendMode says what kind of packets can be sent.

const (
	// SendNone means that no packets should be sent
	SendNone SendMode = iota
	// SendAck means an ACK-only packet should be sent
	SendAck
	// SendPTOInitial means that an Initial probe packet should be sent
	SendPTOInitial
	// SendPTOHandshake means that a Handshake probe packet should be sent
	SendPTOHandshake
	// SendPTOAppData means that an Application data probe packet should be sent
	SendPTOAppData
	// SendPacingLimited means that the pacer doesn't allow sending of a packet right now,
	// but will do in a little while.
	// The timestamp when sending is allowed again can be obtained via the SentPacketHandler.TimeUntilSend.
	SendPacingLimited
	// SendAny means that any packet should be sent
	SendAny
)

func (SendMode) String

func (s SendMode) String() string

type SentPacketHandler

type SentPacketHandler interface {
	// SentPacket may modify the packet
	SentPacket(t time.Time, pn, largestAcked protocol.PacketNumber, streamFrames []StreamFrame, frames []Frame, encLevel protocol.EncryptionLevel, ecn protocol.ECN, size protocol.ByteCount, isPathMTUProbePacket bool)
	// ReceivedAck processes an ACK frame.
	// It does not store a copy of the frame.
	ReceivedAck(f *wire.AckFrame, encLevel protocol.EncryptionLevel, rcvTime time.Time) (bool, error)
	ReceivedBytes(protocol.ByteCount)
	DropPackets(protocol.EncryptionLevel)
	ResetForRetry(rcvTime time.Time) error
	SetHandshakeConfirmed()

	// The SendMode determines if and what kind of packets can be sent.
	SendMode(now time.Time) SendMode
	// TimeUntilSend is the time when the next packet should be sent.
	// It is used for pacing packets.
	TimeUntilSend() time.Time
	SetMaxDatagramSize(count protocol.ByteCount)

	// only to be called once the handshake is complete
	QueueProbePacket(protocol.EncryptionLevel) bool /* was a packet queued */

	ECNMode(isShortHeaderPacket bool) protocol.ECN // isShortHeaderPacket should only be true for non-coalesced 1-RTT packets
	PeekPacketNumber(protocol.EncryptionLevel) (protocol.PacketNumber, protocol.PacketNumberLen)
	PopPacketNumber(protocol.EncryptionLevel) protocol.PacketNumber

	GetLossDetectionTimeout() time.Time
	OnLossDetectionTimeout() error
}

SentPacketHandler handles ACKs received for outgoing packets

type StreamFrame

type StreamFrame struct {
	Frame   *wire.StreamFrame
	Handler FrameHandler
}