move ackhandler.Packet and PacketList shared types to new ackhandler

ackhandler/packet.go

@@ -0,0 +1,49 @@
+package ackhandler
+
+import (
+	"time"
+
+	"github.com/lucas-clemente/quic-go/frames"
+	"github.com/lucas-clemente/quic-go/protocol"
+)
+
+// A Packet is a packet
+// +gen linkedlist
+type Packet struct {
+	PacketNumber protocol.PacketNumber
+	Frames       []frames.Frame
+	Length       protocol.ByteCount
+
+	MissingReports uint8
+
+	SendTime time.Time
+}
+
+// GetStreamFramesForRetransmission gets all the streamframes for retransmission
+func (p *Packet) GetStreamFramesForRetransmission() []*frames.StreamFrame {
+	var streamFrames []*frames.StreamFrame
+	for _, frame := range p.Frames {
+		if streamFrame, isStreamFrame := frame.(*frames.StreamFrame); isStreamFrame {
+			streamFrames = append(streamFrames, streamFrame)
+		}
+	}
+	return streamFrames
+}
+
+// GetControlFramesForRetransmission gets all the control frames for retransmission
+func (p *Packet) GetControlFramesForRetransmission() []frames.Frame {
+	var controlFrames []frames.Frame
+	for _, frame := range p.Frames {
+		// omit ACKs
+		if _, isStreamFrame := frame.(*frames.StreamFrame); isStreamFrame {
+			continue
+		}
+
+		_, isAck := frame.(*frames.AckFrame)
+		_, isStopWaiting := frame.(*frames.StopWaitingFrame)
+		if !isAck && !isStopWaiting {
+			controlFrames = append(controlFrames, frame)
+		}
+	}
+	return controlFrames
+}