logevent

type Config struct {
	// Level at which to log. Defaults to DEBUG.
	// Acceptable are ERROR, WARN, INFO, and DEBUG.
	Level string
	// HumanReadable toggles the JSON format off in favour of a colourised
	// log formatted for human readers.
	HumanReadable bool
	// Output defines to where logs are written. The default is os.Stdout.
	Output io.Writer
}

type Logger interface {
	// Debug will emit the event with level DEBUG.
	Debug(event interface{})
	// Info will emit the event with level INFO.
	Info(event interface{})
	// Warn will emit the event with level WARN
	Warn(event interface{})
	// Error will emit the event with level ERROR.
	Error(event interface{})
	// SetField applies a contextual annotation to all
	// future events logged with this logger.
	SetField(name string, value interface{})
	// Copy the logger of use in some other context.
	Copy() Logger
}