forked from quic-go/quic-go
53 lines
2.1 KiB
Go
53 lines
2.1 KiB
Go
package ackhandler
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import (
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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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)
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// StopWaitingManager manages StopWaitingFrames
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type stopWaitingManager struct {
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// sentStopWaitings map[protocol.PacketNumber]protocol.PacketNumber // map[LeastUnacked]stopWaitingSentWithPacketNumber
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lastNewStopWaitingFirstSentWithPacketNumber protocol.PacketNumber
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currentStopWaitingFrame *frames.StopWaitingFrame
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currentStopWaitingFrameSent bool
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}
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// NewStopWaitingManager creates a new StopWaitingManager
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func NewStopWaitingManager() StopWaitingManager {
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return &stopWaitingManager{
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currentStopWaitingFrame: nil,
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}
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}
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// RegisterPacketForRetransmission prepares the StopWaitingFrame, if necessary
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func (h *stopWaitingManager) RegisterPacketForRetransmission(packet *Packet) {
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if h.currentStopWaitingFrame == nil || h.currentStopWaitingFrame.LeastUnacked <= packet.PacketNumber { // <= because for StopWaitingFrames LeastUnacked = packet.PacketNumber + 1
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h.currentStopWaitingFrame = &frames.StopWaitingFrame{
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LeastUnacked: packet.PacketNumber + 1,
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Entropy: byte(packet.Entropy), // TODO: do we have to send out the entropy of this packet or of the next packet, possible fix for #29
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}
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h.currentStopWaitingFrameSent = false
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}
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}
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// GetStopWaitingFrame gets the StopWaitingFrame that needs to be sent. It returns nil if no StopWaitingFrame needs to be sent
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func (h *stopWaitingManager) GetStopWaitingFrame() *frames.StopWaitingFrame {
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return h.currentStopWaitingFrame
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}
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// SentStopWaitingWithPacket must be called after sending out a StopWaitingFrame with a packet
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func (h *stopWaitingManager) SentStopWaitingWithPacket(packetNumber protocol.PacketNumber) {
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if !h.currentStopWaitingFrameSent {
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h.lastNewStopWaitingFirstSentWithPacketNumber = packetNumber
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}
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h.currentStopWaitingFrameSent = true
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}
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// ReceivedAckForPacketNumber should be called after receiving an ACK
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func (h *stopWaitingManager) ReceivedAckForPacketNumber(packetNumber protocol.PacketNumber) {
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if packetNumber >= h.lastNewStopWaitingFirstSentWithPacketNumber {
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h.currentStopWaitingFrame = nil
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}
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}
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