kubernetes/vendor/go.etcd.io/etcd/pkg/v3/netutil/netutil.go

var resolveTCPAddr …

const retryInterval …

// taken from go's ResolveTCP code but uses configurable ctx
func resolveTCPAddrDefault(ctx context.Context, addr string) (*net.TCPAddr, error) { … }

// resolveTCPAddrs is a convenience wrapper for net.ResolveTCPAddr.
// resolveTCPAddrs return a new set of url.URLs, in which all DNS hostnames
// are resolved.
func resolveTCPAddrs(ctx context.Context, lg *zap.Logger, urls [][]url.URL) ([][]url.URL, error) { … }

func resolveURL(ctx context.Context, lg *zap.Logger, u url.URL) (string, error) { … }

// urlsEqual checks equality of url.URLS between two arrays.
// This check pass even if an URL is in hostname and opposite is in IP address.
func urlsEqual(ctx context.Context, lg *zap.Logger, a []url.URL, b []url.URL) (bool, error) { … }

// URLStringsEqual returns "true" if given URLs are valid
// and resolved to same IP addresses. Otherwise, return "false"
// and error, if any.
func URLStringsEqual(ctx context.Context, lg *zap.Logger, a []string, b []string) (bool, error) { … }

func urlsToStrings(us []url.URL) []string { … }

func stringsToURLs(us []string) ([]url.URL, error) { … }

func IsNetworkTimeoutError(err error) bool { … }