add better debug information on DialConfig

[alarbada]

Is your feature request related to a problem? Please describe.

In my integration tests I'm getting an "EOF" when calling DialTLS. While this looks like a reading file issue, the error context is very poor.

I'm referring to these lines, they have no useful error wrapping:

amqp091-go/connection.go

Lines 199 to 253 in 4a009c7

	func DialConfig(url string, config Config) (*Connection, error) {
	var err error
	var conn net.Conn
	uri, err := ParseURI(url)
	if err != nil {
	return nil, err
	}
	if config.SASL == nil {
	config.SASL = []Authentication{uri.PlainAuth()}
	}
	if config.Vhost == "" {
	config.Vhost = uri.Vhost
	}
	addr := net.JoinHostPort(uri.Host, strconv.FormatInt(int64(uri.Port), 10))
	dialer := config.Dial
	if dialer == nil {
	dialer = DefaultDial(defaultConnectionTimeout)
	}
	conn, err = dialer("tcp", addr)
	if err != nil {
	return nil, err
	}
	if uri.Scheme == "amqps" {
	if config.TLSClientConfig == nil {
	tlsConfig, err := tlsConfigFromURI(uri)
	if err != nil {
	return nil, fmt.Errorf("create TLS config from URI: %w", err)
	}
	config.TLSClientConfig = tlsConfig
	}
	// If ServerName has not been specified in TLSClientConfig,
	// set it to the URI host used for this connection.
	if config.TLSClientConfig.ServerName == "" {
	config.TLSClientConfig.ServerName = uri.Host
	}
	client := tls.Client(conn, config.TLSClientConfig)
	if err := client.Handshake(); err != nil {
	conn.Close()
	return nil, err
	}
	conn = client
	}
	return Open(conn, config)
	}

Describe the solution you'd like

Better error context would be very useful.

Describe alternatives you've considered

No response

Additional context

No response

[lukebakken]

Feel free to submit a PR with tests that implements what you would like to see.

[lukebakken]

@alarbada - At the bare minimum, you should provide a way for us to see the same EOF error that is confusing you. Without that, I will close this issue.