Function defaultClientIDWithHost

client.go:3001–3019

Same as the above, but allows host injection for testability.

(startedAt time.Time, host string)

// Same as the above, but allows host injection for testability.
func defaultClientIDWithHost(startedAt time.Time, host string) string {
	const maxHostLength = 60

	// Truncate degenerately long host names.
	host = strings.ReplaceAll(host, ".", "_")
	if len(host) > maxHostLength {
		host = host[0:maxHostLength]
	}

	// Dots, hyphens, and colons aren't particularly friendly for double click
	// to select (depends on application and configuration), so avoid them all
	// in favor of underscores.
	//
	// Go's time package is really dumb and can't format subseconds without
	// using a dot. So use the dot, then replace it with an underscore below.
	const rfc3339Compact = "2006_01_02T15_04_05.000000"

	return host + "_" + strings.Replace(startedAt.Format(rfc3339Compact), ".", "_", 1)
}