log

type CmdrMinimal interface {
	InDebugging() bool
	GetDebugMode() bool
	GetTraceMode() bool
	SetDebugMode(b bool)
	SetTraceMode(b bool)
}

type Env struct {
	// contains filtered or unexported fields
}

type Level uint32

type Logger interface {
	// Tracef prints the text to stdin if logging level is greater than TraceLevel
	Tracef(msg string, args ...interface{})
	// Debugf prints the text to stdin if logging level is greater than DebugLevel
	Debugf(msg string, args ...interface{})
	// Infof prints the text to stdin if logging level is greater than InfoLevel
	Infof(msg string, args ...interface{})
	// Warnf prints the text to stderr
	Warnf(msg string, args ...interface{})
	// Errorf prints the text to stderr
	Errorf(msg string, args ...interface{})
	// Fatalf is equivalent to Printf() followed by a call to os.Exit(1).
	Fatalf(msg string, args ...interface{})
	// Panicf is equivalent to Printf() followed by a call to panic().
	Panicf(msg string, args ...interface{})
	// Printf calls Output to print to the standard logger.
	// Arguments are handled in the manner of fmt.Printf.
	Printf(msg string, args ...interface{})

	// SetLevel sets the logging level
	SetLevel(lvl Level)
	// GetLevel returns the current logging level
	GetLevel() Level

	// Setup will be invoked once an instance created
	Setup()
}

type LoggerConfig struct {
	Enabled   bool
	Backend   string // zap, sugar, logrus
	Level     string
	Format    string // text, json, ...
	Target    string // console, file, console+file
	Directory string
	DebugMode bool `json:"-" yaml:"-"`
	TraceMode bool `json:"-" yaml:"-"`

	// MaxSize is the maximum size in megabytes of the log file before it gets
	// rotated. It defaults to 100 megabytes.
	MaxSize int `json:"maxsize" yaml:"maxsize"`

	// MaxAge is the maximum number of days to retain old log files based on the
	// timestamp encoded in their filename.  Note that a day is defined as 24
	// hours and may not exactly correspond to calendar days due to daylight
	// savings, leap seconds, etc. The default is not to remove old log files
	// based on age.
	MaxAge int `json:"maxage" yaml:"maxage"`

	// MaxBackups is the maximum number of old log files to retain.  The default
	// is to retain all old log files (though MaxAge may still cause them to get
	// deleted.)
	MaxBackups int `json:"maxbackups" yaml:"maxbackups"`

	// LocalTime determines if the time used for formatting the timestamps in
	// backup files is the computer's local time.  The default is to use UTC
	// time.
	LocalTime bool `json:"localtime" yaml:"localtime"`

	// Compress determines if the rotated log files should be compressed
	// using gzip. The default is not to perform compression.
	Compress bool `json:"compress" yaml:"compress"`
}