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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 framesToRetransmit struct {
crypto []*wire.CryptoFrame
other []wire.Frame
}
type retransmissionQueue struct {
initial *framesToRetransmit
handshake *framesToRetransmit
appData framesToRetransmit
}
func newRetransmissionQueue() *retransmissionQueue {
return &retransmissionQueue{
initial: &framesToRetransmit{},
handshake: &framesToRetransmit{},
}
}
func (q *retransmissionQueue) addInitial(f wire.Frame) {
if q.initial == nil {
return
}
if cf, ok := f.(*wire.CryptoFrame); ok {
q.initial.crypto = append(q.initial.crypto, cf)
return
}
q.initial.other = append(q.initial.other, f)
}
func (q *retransmissionQueue) addHandshake(f wire.Frame) {
if q.handshake == nil {
return
}
if cf, ok := f.(*wire.CryptoFrame); ok {
q.handshake.crypto = append(q.handshake.crypto, cf)
return
}
q.handshake.other = append(q.handshake.other, f)
}
func (q *retransmissionQueue) addAppData(f wire.Frame) {
switch f := f.(type) {
case *wire.StreamFrame:
panic("STREAM frames are handled with their respective streams.")
case *wire.CryptoFrame:
q.appData.crypto = append(q.appData.crypto, f)
default:
q.appData.other = append(q.appData.other, f)
}
}
func (q *retransmissionQueue) HasData(encLevel protocol.EncryptionLevel) bool {
//nolint:exhaustive // 0-RTT data is retransmitted in 1-RTT packets.
switch encLevel {
case protocol.EncryptionInitial:
return q.initial != nil &&
(len(q.initial.crypto) > 0 || len(q.initial.other) > 0)
case protocol.EncryptionHandshake:
return q.handshake != nil &&
(len(q.handshake.crypto) > 0 || len(q.handshake.other) > 0)
case protocol.Encryption1RTT:
return len(q.appData.crypto) > 0 || len(q.appData.other) > 0
}
return false
}
func (q *retransmissionQueue) GetFrame(encLevel protocol.EncryptionLevel, maxLen protocol.ByteCount, v protocol.Version) wire.Frame {
var r *framesToRetransmit
//nolint:exhaustive // 0-RTT data is retransmitted in 1-RTT packets.
switch encLevel {
case protocol.EncryptionInitial:
r = q.initial
case protocol.EncryptionHandshake:
r = q.handshake
case protocol.Encryption1RTT:
r = &q.appData
}
if r == nil {
return nil
}
if len(r.crypto) > 0 {
f := r.crypto[0]
newFrame, needsSplit := f.MaybeSplitOffFrame(maxLen, v)
if newFrame == nil && !needsSplit { // the whole frame fits
r.crypto = r.crypto[1:]
return f
}
if newFrame != nil { // frame was split. Leave the original frame in the queue.
return newFrame
}
}
if len(r.other) == 0 {
return nil
}
f := r.other[0]
if f.Length(v) > maxLen {
return nil
}
r.other = r.other[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
case protocol.EncryptionHandshake:
q.handshake = nil
default:
panic(fmt.Sprintf("unexpected encryption level: %s", encLevel))
}
}
func (q *retransmissionQueue) AckHandler(encLevel protocol.EncryptionLevel) ackhandler.FrameHandler {
switch encLevel {
case protocol.EncryptionInitial:
return (*retransmissionQueueInitialAckHandler)(q)
case protocol.EncryptionHandshake:
return (*retransmissionQueueHandshakeAckHandler)(q)
case protocol.Encryption0RTT, protocol.Encryption1RTT:
return (*retransmissionQueueAppDataAckHandler)(q)
}
return nil
}
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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