util

type Logger interface {
	Debug(args ...interface{})
	Debugf(format string, args ...interface{})
	Info(args ...interface{})
	Infof(format string, args ...interface{})
	Warn(args ...interface{})
	Warnf(format string, args ...interface{})
	Error(args ...interface{})
	Errorf(format string, args ...interface{})

	// Log and terminate process (unrecoverable)
	Fatal(args ...interface{})

	// Log with fmt.Printf-like formatting and terminate process (unrecoverable)
	Fatalf(format string, args ...interface{})

	// Log and panic (recoverable)
	Panic(args ...interface{})

	// Log with fmt.Printf-like formatting, then panic (recoverable)
	Panicf(format string, args ...interface{})

	// Set key/value context for further logging with the returned logger
	WithField(key string, value interface{}) Logger

	// Set key/value context for further logging with the returned logger
	WithFields(keyValues map[string]interface{}) Logger

	// Return a logger with the specified error set, to be included in a subsequent normal logging call
	WithError(err error) Logger
}