add the NO_VIABLE_PATH error

internal/qerr/error_codes.go

@@ -27,6 +27,7 @@ const (
 	CryptoBufferExceeded    ErrorCode = 0xd
 	KeyUpdateError          ErrorCode = 0xe
 	AEADLimitReached        ErrorCode = 0xf
+	NoViablePathError       ErrorCode = 0x10
 )
 
 func (e ErrorCode) isCryptoError() bool {
@@ -83,6 +84,8 @@ func (e ErrorCode) String() string {
 		return "KEY_UPDATE_ERROR"
 	case AEADLimitReached:
 		return "AEAD_LIMIT_REACHED"
+	case NoViablePathError:
+		return "NO_VIABLE_PATH"
 	default:
 		if e.isCryptoError() {
 			return fmt.Sprintf("CRYPTO_ERROR (%#x)", uint16(e))

qlog/types.go

@@ -213,6 +213,8 @@ func (e transportError) String() string {
 		return "key_update_error"
 	case qerr.AEADLimitReached:
 		return "aead_limit_reached"
+	case qerr.NoViablePathError:
+		return "no_viable_path"
 	default:
 		return ""
 	}

qlog/types_test.go

@@ -121,6 +121,7 @@ var _ = Describe("Types", func() {
 			Expect(transportError(qerr.InvalidToken).String()).To(Equal("invalid_token"))
 			Expect(transportError(qerr.ApplicationError).String()).To(Equal("application_error"))
 			Expect(transportError(qerr.CryptoBufferExceeded).String()).To(Equal("crypto_buffer_exceeded"))
+			Expect(transportError(qerr.NoViablePathError).String()).To(Equal("no_viable_path"))
 			Expect(transportError(1337).String()).To(BeEmpty())
 		})
 	})