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package quic
import (
"fmt"
"github.com/quic-go/quic-go/internal/ackhandler"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/quic-go/quic-go/internal/wire"
)
type retransmissionQueue struct {
initial []wire.Frame
initialCryptoData []*wire.CryptoFrame
handshake []wire.Frame
handshakeCryptoData []*wire.CryptoFrame
appData []wire.Frame
}
func newRetransmissionQueue() *retransmissionQueue {
return &retransmissionQueue{}
}
// AddPing queues a ping.
// It is used when a probe packet needs to be sent
func (q *retransmissionQueue) AddPing(encLevel protocol.EncryptionLevel) {
//nolint:exhaustive // Cannot send probe packets for 0-RTT.
switch encLevel {
case protocol.EncryptionInitial:
q.addInitial(&wire.PingFrame{})
case protocol.EncryptionHandshake:
q.addHandshake(&wire.PingFrame{})
case protocol.Encryption1RTT:
q.addAppData(&wire.PingFrame{})
default:
panic("unexpected encryption level")
}
}
func (q *retransmissionQueue) addInitial(f wire.Frame) {
if cf, ok := f.(*wire.CryptoFrame); ok {
q.initialCryptoData = append(q.initialCryptoData, cf)
return
}
q.initial = append(q.initial, f)
}
func (q *retransmissionQueue) addHandshake(f wire.Frame) {
if cf, ok := f.(*wire.CryptoFrame); ok {
q.handshakeCryptoData = append(q.handshakeCryptoData, cf)
return
}
q.handshake = append(q.handshake, f)
}
func (q *retransmissionQueue) HasInitialData() bool {
return len(q.initialCryptoData) > 0 || len(q.initial) > 0
}
func (q *retransmissionQueue) HasHandshakeData() bool {
return len(q.handshakeCryptoData) > 0 || len(q.handshake) > 0
}
func (q *retransmissionQueue) HasAppData() bool {
return len(q.appData) > 0
}
func (q *retransmissionQueue) addAppData(f wire.Frame) {
if _, ok := f.(*wire.StreamFrame); ok {
panic("STREAM frames are handled with their respective streams.")
}
q.appData = append(q.appData, f)
}
func (q *retransmissionQueue) GetInitialFrame(maxLen protocol.ByteCount, v protocol.Version) wire.Frame {
if len(q.initialCryptoData) > 0 {
f := q.initialCryptoData[0]
newFrame, needsSplit := f.MaybeSplitOffFrame(maxLen, v)
if newFrame == nil && !needsSplit { // the whole frame fits
q.initialCryptoData = q.initialCryptoData[1:]
return f
}
if newFrame != nil { // frame was split. Leave the original frame in the queue.
return newFrame
}
}
if len(q.initial) == 0 {
return nil
}
f := q.initial[0]
if f.Length(v) > maxLen {
return nil
}
q.initial = q.initial[1:]
return f
}
func (q *retransmissionQueue) GetHandshakeFrame(maxLen protocol.ByteCount, v protocol.Version) wire.Frame {
if len(q.handshakeCryptoData) > 0 {
f := q.handshakeCryptoData[0]
newFrame, needsSplit := f.MaybeSplitOffFrame(maxLen, v)
if newFrame == nil && !needsSplit { // the whole frame fits
q.handshakeCryptoData = q.handshakeCryptoData[1:]
return f
}
if newFrame != nil { // frame was split. Leave the original frame in the queue.
return newFrame
}
}
if len(q.handshake) == 0 {
return nil
}
f := q.handshake[0]
if f.Length(v) > maxLen {
return nil
}
q.handshake = q.handshake[1:]
return f
}
func (q *retransmissionQueue) GetAppDataFrame(maxLen protocol.ByteCount, v protocol.Version) wire.Frame {
if len(q.appData) == 0 {
return nil
}
f := q.appData[0]
if f.Length(v) > maxLen {
return nil
}
q.appData = q.appData[1:]
return f
}
func (q *retransmissionQueue) DropPackets(encLevel protocol.EncryptionLevel) {
//nolint:exhaustive // Can only drop Initial and Handshake packet number space.
switch encLevel {
case protocol.EncryptionInitial:
q.initial = nil
q.initialCryptoData = nil
case protocol.EncryptionHandshake:
q.handshake = nil
q.handshakeCryptoData = nil
default:
panic(fmt.Sprintf("unexpected encryption level: %s", encLevel))
}
}
func (q *retransmissionQueue) InitialAckHandler() ackhandler.FrameHandler {
return (*retransmissionQueueInitialAckHandler)(q)
}
func (q *retransmissionQueue) HandshakeAckHandler() ackhandler.FrameHandler {
return (*retransmissionQueueHandshakeAckHandler)(q)
}
func (q *retransmissionQueue) AppDataAckHandler() ackhandler.FrameHandler {
return (*retransmissionQueueAppDataAckHandler)(q)
}
type retransmissionQueueInitialAckHandler retransmissionQueue
func (q *retransmissionQueueInitialAckHandler) OnAcked(wire.Frame) {}
func (q *retransmissionQueueInitialAckHandler) OnLost(f wire.Frame) {
(*retransmissionQueue)(q).addInitial(f)
}
type retransmissionQueueHandshakeAckHandler retransmissionQueue
func (q *retransmissionQueueHandshakeAckHandler) OnAcked(wire.Frame) {}
func (q *retransmissionQueueHandshakeAckHandler) OnLost(f wire.Frame) {
(*retransmissionQueue)(q).addHandshake(f)
}
type retransmissionQueueAppDataAckHandler retransmissionQueue
func (q *retransmissionQueueAppDataAckHandler) OnAcked(wire.Frame) {}
func (q *retransmissionQueueAppDataAckHandler) OnLost(f wire.Frame) {
(*retransmissionQueue)(q).addAppData(f)
}
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