Function dial

tls.go:120–162

(ctx context.Context, netDialer *net.Dialer, network, addr string, config *Config)

}

func dial(ctx context.Context, netDialer *net.Dialer, network, addr string, config *Config) (*Conn, error) {
	if netDialer.Timeout != 0 {
		var cancel context.CancelFunc
		ctx, cancel = context.WithTimeout(ctx, netDialer.Timeout)
		defer cancel()
	}

	if !netDialer.Deadline.IsZero() {
		var cancel context.CancelFunc
		ctx, cancel = context.WithDeadline(ctx, netDialer.Deadline)
		defer cancel()
	}

	rawConn, err := netDialer.DialContext(ctx, network, addr)
	if err != nil {
		return nil, err
	}

	colonPos := strings.LastIndex(addr, ":")
	if colonPos == -1 {
		colonPos = len(addr)
	}
	hostname := addr[:colonPos]

	if config == nil {
		config = defaultConfig()
	}
	// If no ServerName is set, infer the ServerName
	// from the hostname we're connecting to.
	if config.ServerName == "" {
		// Make a copy to avoid polluting argument or default.
		c := config.Clone()
		c.ServerName = hostname
		config = c
	}

	conn := Client(rawConn, config)
	if err := conn.HandshakeContext(ctx); err != nil {
		rawConn.Close()
		return nil, err
	}
	return conn, nil
}

// Dial connects to the given network address using net.Dial
// and then initiates a TLS handshake, returning the resulting