harness-drone/vendor/github.com/lucas-clemente/quic-go/ackhandler/stop_waiting_manager.go

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2017-07-24 23:15:25 +00:00
package ackhandler
import (
"github.com/lucas-clemente/quic-go/frames"
"github.com/lucas-clemente/quic-go/protocol"
)
// This stopWaitingManager is not supposed to satisfy the StopWaitingManager interface, which is a remnant of the legacy AckHandler, and should be remove once we drop support for QUIC 33
type stopWaitingManager struct {
largestLeastUnackedSent protocol.PacketNumber
nextLeastUnacked protocol.PacketNumber
lastStopWaitingFrame *frames.StopWaitingFrame
}
func (s *stopWaitingManager) GetStopWaitingFrame(force bool) *frames.StopWaitingFrame {
if s.nextLeastUnacked <= s.largestLeastUnackedSent {
if force {
return s.lastStopWaitingFrame
}
return nil
}
s.largestLeastUnackedSent = s.nextLeastUnacked
swf := &frames.StopWaitingFrame{
LeastUnacked: s.nextLeastUnacked,
}
s.lastStopWaitingFrame = swf
return swf
}
func (s *stopWaitingManager) ReceivedAck(ack *frames.AckFrame) {
if ack.LargestAcked >= s.nextLeastUnacked {
s.nextLeastUnacked = ack.LargestAcked + 1
}
}
func (s *stopWaitingManager) QueuedRetransmissionForPacketNumber(p protocol.PacketNumber) {
if p >= s.nextLeastUnacked {
s.nextLeastUnacked = p + 1
}
}