logging

type LogContextInterface interface {
	// Caller's function name.
	Func() string
	// Caller's line number.
	Line() int
	// Caller's file short path (in slashed form).
	ShortPath() string
	// Caller's file full path (in slashed form).
	FullPath() string
	// Caller's file name (without path).
	FileName() string
	// True if the context is correct and may be used.
	// If false, then an error in context evaluation occurred and
	// all its other data may be corrupted.
	IsValid() bool
	// Time when log function was called.
	CallTime() time.Time
	// Custom context that can be set by calling logger.SetContext
	CustomContext() interface{}
}