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* Copyright 2018 gRPC authors.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
//go:generate ./
// Package internal contains common core functionality for ALTS.
package internal
import (
const (
// ClientSide identifies the client in this communication.
ClientSide Side = iota
// ServerSide identifies the server in this communication.
// PeerNotRespondingError is returned when a peer server is not responding
// after a channel has been established. It is treated as a temporary connection
// error and re-connection to the server should be attempted.
var PeerNotRespondingError = &peerNotRespondingError{}
// Side identifies the party's role: client or server.
type Side int
type peerNotRespondingError struct{}
// Return an error message for the purpose of logging.
func (e *peerNotRespondingError) Error() string {
return "peer server is not responding and re-connection should be attempted."
// Temporary indicates if this connection error is temporary or fatal.
func (e *peerNotRespondingError) Temporary() bool {
return true
// Handshaker defines a ALTS handshaker interface.
type Handshaker interface {
// ClientHandshake starts and completes a client-side handshaking and
// returns a secure connection and corresponding auth information.
ClientHandshake(ctx context.Context) (net.Conn, credentials.AuthInfo, error)
// ServerHandshake starts and completes a server-side handshaking and
// returns a secure connection and corresponding auth information.
ServerHandshake(ctx context.Context) (net.Conn, credentials.AuthInfo, error)
// Close terminates the Handshaker. It should be called when the caller
// obtains the secure connection.
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