// Copyright 2017 Google LLC. All Rights Reserved.
//
// 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
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package integration

import (
	"fmt"
	"net"
)

// listen opens a random high numbered port for listening.
func listen() (string, net.Listener, error) {
	lis, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		return "", nil, fmt.Errorf("failed to listen: %v", err)
	}
	_, port, err := net.SplitHostPort(lis.Addr().String())
	if err != nil {
		return "", nil, fmt.Errorf("unrecognized format for listen address %v: %v", lis.Addr().String(), err)
	}
	addr := "localhost:" + port
	return addr, lis, nil
}