Method parseServerURL

nats.go:2062–2111

parseServerURL parses a server URL string into a Server struct. It handles scheme defaults and port defaults. Does not validate websocket consistency. Returns the parsed Server and whether it's a websocket URL.

(sURL string, implicit, saveTLSName bool)

// It handles scheme defaults and port defaults. Does not validate websocket consistency.
// Returns the parsed Server and whether it's a websocket URL.
func (nc *Conn) parseServerURL(sURL string, implicit, saveTLSName bool) (*Server, error) {
	if !strings.Contains(sURL, "://") {
		sURL = fmt.Sprintf("%s://%s", nc.connScheme(), sURL)
	}
	var (
		u   *url.URL
		err error
	)
	for i := 0; i < 2; i++ {
		u, err = url.Parse(sURL)
		if err != nil {
			return nil, err
		}
		if u.Port() != "" {
			break
		}
		// In case given URL is of the form "localhost:", just add
		// the port number at the end, otherwise, add ":4222".
		if sURL[len(sURL)-1] != ':' {
			sURL += ":"
		}
		switch u.Scheme {
		case wsScheme:
			sURL += defaultWSPortString
		case wsSchemeTLS:
			sURL += defaultWSSPortString
		default:
			sURL += defaultPortString
		}
	}

	var tlsName string
	if implicit {
		curl := nc.current.URL
		// Check to see if we do not have a url.User but current connected
		// url does. If so copy over.
		if u.User == nil && curl.User != nil {
			u.User = curl.User
		}
		// We are checking to see if we have a secure connection and are
		// adding an implicit server that just has an IP. If so we will remember
		// the current hostname we are connected to.
		if saveTLSName && hostIsIP(u) {
			tlsName = curl.Hostname()
		}
	}

	s := &Server{URL: u, isImplicit: implicit, tlsName: tlsName}
	return s, nil
}

// addURLToPool adds an entry to the server pool
func (nc *Conn) addURLToPool(sURL string, implicit, saveTLSName bool) error {