trace

type Trace interface {
	// Parent will return the parent trace
	Parent() Trace
	// Name will return the current trace name
	Name() string
	// SetName will set a new name for the Trace object
	SetName(name string)
	// ID will return the current trace id
	ID() string
	// Start will return the current trace start time
	Start() time.Time
	// Duration will return the current trace Duration
	Duration() time.Duration
	// Info will print the args as the info level log
	Info(args ...interface{})
	// Infof will print the args with a format as the info level log
	Infof(format string, args ...interface{})
	// Warn will print the args as the warn level log
	Warn(args ...interface{})
	// Warnf will print the args with a format as the warn level log
	Warnf(format string, args ...interface{})
	// Error will print the args as the error level log
	Error(args ...interface{})
	// Errorf will print the args with a format as the error level log
	Errorf(format string, args ...interface{})
	// Stack will return current stack
	Stack(all ...bool) string
	// String will return a string-serialized trace
	String() string
	// Fatalf will print log and exit process
	Fatalf(format string, args ...interface{})
	// Fatalf will print log and exit process
	Fatal(args ...interface{})

	Debug(args ...interface{})

	Debugf(format string, args ...interface{})
	// 1. 支持命令行参数指定Level, eg:  -v=3
	// 2. 支持环境变量支持Level, export LOGVERB=3
	V(level int) Trace
	Enable() bool
}