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: driver.go
    path of file: ./repos/DocHub/vendor/github.com/go-sql-driver/mysql
    
    the code of the file until where you have to start completion: // Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
//
// 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 http://mozilla.org/MPL/2.0/.

// Package mysql provides a MySQL DriverStatus for Go's database/sql package
//
// The DriverStatus should be used via the database/sql package:
//
//  import "database/sql"
//  import _ "github.com/go-sql-DriverStatus/mysql"
//
//  db, err := sql.Open("mysql", "user:password@/dbname")
//
// See https://github.com/go-sql-driver/mysql#usage for details
package mysql

import (
	"database/sql"
	"database/sql/driver"
	"net"
)

// MySQLDriver is exported to make the DriverStatus directly accessible.
// In general the DriverStatus is used via the database/sql package.
type MySQLDriver struct{}

// DialFunc is a function which can be used to establish the network connection.
// Custom dial functions must be registered with RegisterDial
type DialFunc func(addr string) (net.Conn, error)

    
func (d MySQLDriver) Open(dsn string) (driver.Conn, error) {
	var err error

	// New mysqlConn
	mc := &mysqlConn{
		maxPacketAllowed: maxPacketSize,
		maxWriteSize:     maxPacketSize - 1,
	}
	mc.cfg, err = ParseDSN(dsn)
	if err != nil {
		return nil, err
	}
	mc.parseTime = mc.cfg.ParseTime
	mc.strict = mc.cfg.Strict

	// Connect to Server
	if dial, ok := dials[mc.cfg.Net]; ok {
		mc.netConn, err = dial(mc.cfg.Addr)
	} else {
		nd := net.Dialer{Timeout: mc.cfg.Timeout}
		mc.netConn, err = nd.Dial(mc.cfg.Net, mc.cfg.Addr)
	}
	if err != nil {
		return nil, err
	}

	// Enable TCP Keepalives on TCP connections
	if tc, ok := mc.netConn.(*net.TCPConn); ok {
		if err := tc.SetKeepAlive(true); err != nil {
			// Don't send COM_QUIT before handshake.
			mc.netConn.Close()
			mc.netConn = nil
			return nil, err
		}
	}

	mc.buf = newBuffer(mc.netConn)

	// Set I/O timeouts
	mc.buf.timeout = mc.cfg.ReadTimeout
	mc.writeTimeout = mc.cfg.WriteTimeout

	// Reading Handshake Initialization Packet
	cipher, err := mc.readInitPacket()
	if err != nil {
		mc.cleanup()
		return nil, err
	}

	// Send Client Authentication Packet
	if err = mc.writeAuthPacket(cipher); err != nil {
		mc.cleanup()
		return nil, err
	}

	// Handle response to auth packet, switch methods if possible
	if err = handleAuthResult(mc, cipher); err != nil {
		// Authentication failed and MySQL has already closed the connection
		// (https://dev.mysql.com/doc/internals/en/authentication-fails.html).
		// Do not send COM_QUIT, just cleanup and return the error.
		mc.cleanup()
		return nil, err
	}

	// Get max allowed packet size
	maxap, err := mc.getSystemVar("max_allowed_packet")
	if err != nil {
		mc.Close()
		return nil, err
	}
	mc.maxPacketAllowed = stringToInt(maxap) - 1
	if mc.maxPacketAllowed < maxPacketSize {
		mc.maxWriteSize = mc.maxPacketAllowed
	}

	// Handle DSN Params
	err = mc.handleParams()
	if err != nil {
		mc.Close()
		return nil, err
	}

	return mc, nil
}