You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: socket_classic.go
    path of file: ./repos/teller/vendor/google.golang.org/appengine/socket
    
    the code of the file until where you have to start completion: // Copyright 2012 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.

// +build appengine

package socket

import (
	"fmt"
	"io"
	"net"
	"strconv"
	"time"

	"github.com/golang/protobuf/proto"
	"golang.org/x/net/context"
	"google.golang.org/
    
func resolve(ctx context.Context, fams []pb.CreateSocketRequest_SocketFamily, host string) ([][]byte, bool, error) {
	// Check if it's an IP address.
	if ip := net.ParseIP(host); ip != nil {
		if ip := ip.To4(); ip != nil {
			return [][]byte{ip}, false, nil
		}
		return [][]byte{ip}, false, nil
	}

	req := &pb.ResolveRequest{
		Name:            &host,
		AddressFamilies: fams,
	}
	res := &pb.ResolveReply{}
	if err := internal.Call(ctx, "remote_socket", "Resolve", req, res); err != nil {
		// XXX: need to map to pb.ResolveReply_ErrorCode?
		return nil, false, err
	}
	return res.PackedAddress, true, nil
}