func init() {
if term.IsTty(os.Stdout.Fd()) {
StdoutHandler = StreamHandler(colorable.NewColorableStdout(), TerminalFormat())
}
if term.IsTty(os.Stderr.Fd()) {
StderrHandler = StreamHandler(colorable.NewColorableStderr(), TerminalFormat())
}
root = &logger{[]interface{}{}, new(swapHandler)}
root.SetHandler(StdoutHandler)
}
func (w *Logged) HandlerFor(target, level, format string) (log.Handler, error) {
lvl, err := log.LvlFromString(level)
if err != nil {
return nil, fmt.Errorf("Invalid log level: %v", err)
}
var logformat log.Format
switch format {
case "json":
logformat = log.JsonFormat()
case "logfmt":
logformat = log.LogfmtFormat()
case "terminal", "term":
switch {
case target == "stdout" && term.IsTty(os.Stdout.Fd()):
logformat = log.TerminalFormat()
case target == "stderr" && term.IsTty(os.Stderr.Fd()):
logformat = log.TerminalFormat()
default:
logformat = log.LogfmtFormat()
}
default:
return nil, fmt.Errorf("Invalid log format: %v", format)
}
var handler log.Handler
switch target {
case "stdout":
handler = log.StreamHandler(colorable.NewColorableStdout(), logformat)
case "stderr":
handler = log.StreamHandler(colorable.NewColorableStderr(), logformat)
case "false":
handler = log.DiscardHandler()
default:
handler, err = log.FileHandler(target, logformat)
if err != nil {
return nil, fmt.Errorf("Failed to open log file '%s': %v", target, err)
}
}
return log.LvlFilterHandler(lvl, handler), nil
}