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: tcp_dial.go
    path of file: ./repos/syncthing/lib/connections
    
    the code of the file until where you have to start completion: // Copyright (C) 2016 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.

package connections

import (
	"context"
	"crypto/tls"
	"net/url"
	"time"

	"github.com/syncthing/syncthing/lib/config"
	"github.com/syncthing/syncthing/lib/connections/registry"
	"github.com/syncthing/syncthing/lib/dialer"
	"github.com/syncthing/syncthing/lib/protocol"
)

func init() {
	factory := &tcpDialerFactory{}
	for _, scheme := range []string{"tcp", "tcp4", "tcp6"} {
		dialers[scheme] = factory
	}
}

type tcpDialer struct {
	commonDialer
	registry *registry.Registry
}

func (d *tcpDialer) Dial(ctx context.Context, _ protocol.DeviceID, uri *url.URL) (internalConn, erro
    
func (d *tcpDialer) Dial(ctx context.Context, _ protocol.DeviceID, uri *url.URL) (internalConn, error) {
	uri = fixupPort(uri, config.DefaultTCPPort)

	timeoutCtx, cancel := context.WithTimeout(ctx, 10*time.Second)
	defer cancel()
	conn, err := dialer.DialContextReusePortFunc(d.registry)(timeoutCtx, uri.Scheme, uri.Host)
	if err != nil {
		return internalConn{}, err
	}

	err = dialer.SetTCPOptions(conn)
	if err != nil {
		l.Debugln("Dial (BEP/tcp): setting tcp options:", err)
	}

	err = dialer.SetTrafficClass(conn, d.trafficClass)
	if err != nil {
		l.Debugln("Dial (BEP/tcp): setting traffic class:", err)
	}

	tc := tls.Client(conn, d.tlsCfg)
	err = tlsTimedHandshake(tc)
	if err != nil {
		tc.Close()
		return internalConn{}, err
	}

	priority := d.wanPriority
	isLocal := d.lanChecker.isLAN(conn.RemoteAddr())
	if isLocal {
		priority = d.lanPriority
	}

	return newInternalConn(tc, connTypeTCPClient, isLocal, priority), nil
}