本文介绍了Go语言中用于日志记录的Hook接口。该接口允许用户定义回调函数，在每次日志操作结束时调用。Hook接口包含一个Fire方法，接受日志级别和已格式化的字符串作为参数。
package blog4go
// Hook Interface determine types of functions should be declared and
// implemented when user offers user defined function call before every
// logging action end.
// users may use this hook as a callback function when something happen.
// Fire function received two parameters.
// level is the level associate with that logging action.
// message is the formatted string already written.
type Hook interface {
Fire(level LevelType, args ...interface{})
}
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