qtls: remove unneeded type alias for the tls.QUICEncryptionLevel (#4220)

* qtls: remove unneeded type alias for the tls.QUICEncryptionLevel

* handshake: make cryptoSetup.WriteRecord private

internal/handshake/crypto_setup.go

@@ -283,7 +283,7 @@ func (h *cryptoSetup) handleEvent(ev tls.QUICEvent) (done bool, err error) {
  h.rejected0RTT()
  return false, nil
  case tls.QUICWriteData:
- h.WriteRecord(ev.Level, ev.Data)
+ h.writeRecord(ev.Level, ev.Data)
  return false, nil
  case tls.QUICHandshakeDone:
  h.handshakeComplete()
@@ -490,7 +490,7 @@ func (h *cryptoSetup) SetWriteKey(el tls.QUICEncryptionLevel, suiteID uint16, tr
  h.mutex.Lock()
  //nolint:exhaustive // The TLS stack doesn't export Initial keys.
  switch el {
- case qtls.QUICEncryptionLevelEarly:
+ case tls.QUICEncryptionLevelEarly:
  if h.perspective == protocol.PerspectiveServer {
  panic("Received 0-RTT write key for the server")
  }
@@ -539,15 +539,15 @@ func (h *cryptoSetup) SetWriteKey(el tls.QUICEncryptionLevel, suiteID uint16, tr
  }
 }
 
-// WriteRecord is called when TLS writes data
-func (h *cryptoSetup) WriteRecord(encLevel qtls.QUICEncryptionLevel, p []byte) {
+// writeRecord is called when TLS writes data
+func (h *cryptoSetup) writeRecord(encLevel tls.QUICEncryptionLevel, p []byte) {
  //nolint:exhaustive // handshake records can only be written for Initial and Handshake.
  switch encLevel {
- case qtls.QUICEncryptionLevelInitial:
+ case tls.QUICEncryptionLevelInitial:
  h.events = append(h.events, Event{Kind: EventWriteInitialData, Data: p})
- case qtls.QUICEncryptionLevelHandshake:
+ case tls.QUICEncryptionLevelHandshake:
  h.events = append(h.events, Event{Kind: EventWriteHandshakeData, Data: p})
- case qtls.QUICEncryptionLevelApplication:
+ case tls.QUICEncryptionLevelApplication:
  panic("unexpected write")
  default:
  panic(fmt.Sprintf("unexpected write encryption level: %s", encLevel))

internal/qtls/qtls.go

@@ -8,17 +8,6 @@ import (
  "github.com/quic-go/quic-go/internal/protocol"
 )
 
-type (
- QUICEncryptionLevel = tls.QUICEncryptionLevel
-)
-
-const (
- QUICEncryptionLevelInitial = tls.QUICEncryptionLevelInitial
- QUICEncryptionLevelEarly = tls.QUICEncryptionLevelEarly
- QUICEncryptionLevelHandshake = tls.QUICEncryptionLevelHandshake
- QUICEncryptionLevelApplication = tls.QUICEncryptionLevelApplication
-)
-
 func SetupConfigForServer(qconf *tls.QUICConfig, _ bool, getData func() []byte, handleSessionTicket func([]byte, bool) bool) {
  conf := qconf.TLSConfig