开源包mqtt源码_DEBUG
巧妙的调试不注释变量
官方代码包
type (
// Logger interface allows implementations to provide to this package any
// object that implements the methods defined in it.
Logger interface {
Println(v ...interface{})
Printf(format string, v ...interface{})
}
// NOOPLogger implements the logger that does not perform any operation
// by default. This allows us to efficiently discard the unwanted messages.
NOOPLogger struct{}
)
func (NOOPLogger) Println(v ...interface{}) {}
func (NOOPLogger) Printf(format string, v ...interface{}) {}
// Internal levels of library output that are initialised to not print
// anything but can be overridden by programmer
var (
ERROR Logger = NOOPLogger{}
CRITICAL Logger = NOOPLogger{}
WARN Logger = NOOPLogger{}
DEBUG Logger = NOOPLogger{}
)
分析
看这个项目时候总是有这样的代码 DEBUG.Println(CLI, "client is connected/reconnected")
, 但是进到源码一看啥都没打印
在自己写项目时候,总是会调试一些东西,有些变量我们会用fmt打印出来,但是不想让变量打印,还要注释上面的var定义,很麻烦,就要用一个空接口来接受我们的需要注释的变量,这个设计很巧妙
果断把他抄作业,带走到我的go-utils工具包里面去