save the encryption level of a sent packet in the SentPacketHandler

ackhandler/packet.go

@@ -10,9 +10,10 @@ import (
 // A Packet is a packet
 // +gen linkedlist
 type Packet struct {
-	PacketNumber protocol.PacketNumber
-	Frames       []frames.Frame
-	Length       protocol.ByteCount
+	PacketNumber    protocol.PacketNumber
+	Frames          []frames.Frame
+	Length          protocol.ByteCount
+	EncryptionLevel protocol.EncryptionLevel
 
 	MissingReports uint8
 

session.go

@@ -623,9 +623,10 @@ func (s *session) sendPacket() error {
 		}
 
 		err = s.sentPacketHandler.SentPacket(&ackhandler.Packet{
-			PacketNumber: packet.number,
-			Frames:       packet.frames,
-			Length:       protocol.ByteCount(len(packet.raw)),
+			PacketNumber:    packet.number,
+			Frames:          packet.frames,
+			Length:          protocol.ByteCount(len(packet.raw)),
+			EncryptionLevel: packet.encryptionLevel,
 		})
 		if err != nil {
 			return err

session_test.go

@@ -800,6 +800,28 @@ var _ = Describe("Session", func() {
 			Expect(mconn.written).To(HaveLen(1))
 			Expect(mconn.written[0]).To(ContainSubstring(string([]byte("PRST"))))
 		})
+
+		It("informs the SentPacketHandler about sent packets", func() {
+			sess.sentPacketHandler = newMockSentPacketHandler()
+			sess.packer.packetNumberGenerator.next = 0x1337 + 9
+			sess.packer.cryptoSetup = &mockCryptoSetup{encLevelSeal: protocol.EncryptionSecure}
+
+			f := &frames.StreamFrame{
+				StreamID: 5,
+				Data:     []byte("foobar"),
+			}
+			sess.streamFramer.AddFrameForRetransmission(f)
+			_, err := sess.GetOrOpenStream(5)
+			Expect(err).ToNot(HaveOccurred())
+			err = sess.sendPacket()
+			Expect(err).NotTo(HaveOccurred())
+			Expect(mconn.written).To(HaveLen(1))
+			sentPackets := sess.sentPacketHandler.(*mockSentPacketHandler).sentPackets
+			Expect(sentPackets).To(HaveLen(1))
+			Expect(sentPackets[0].Frames).To(ContainElement(f))
+			Expect(sentPackets[0].EncryptionLevel).To(Equal(protocol.EncryptionSecure))
+			Expect(sentPackets[0].Length).To(BeEquivalentTo(len(mconn.written[0])))
+		})
 	})
 
 	Context("retransmissions", func() {