为什么定义的xlog接口要返回error？

[ryeLearnMore]

type Logger interface {
SetLevel(name, level string) error

Debug(format string, a ...interface{}) (err error)
Trace(format string, a ...interface{}) (err error)
Notice(format string, a ...interface{}) (err error)
Warn(format string, a ...interface{}) (err error)
Fatal(format string, a ...interface{}) (err error)

Debugx(logID, format string, a ...interface{}) (err error)
Tracex(logID, format string, a ...interface{}) (err error)
Noticex(logID, format string, a ...interface{}) (err error)
Warnx(logID, format string, a ...interface{}) (err error)
Fatalx(logID, format string, a ...interface{}) (err error)

Close()

}

[gongna-au]

考虑到可能会在写入日志时遇到 I/O 错误，通过返回相应的错误。使得接口能够兼容多种实现，而不需要在接口定义中硬编码错误处理逻辑。

type Logger interface { SetLevel(name, level string) error

Debug(format string, a ...interface{}) (err error)
Trace(format string, a ...interface{}) (err error)
Notice(format string, a ...interface{}) (err error)
Warn(format string, a ...interface{}) (err error)
Fatal(format string, a ...interface{}) (err error)

Debugx(logID, format string, a ...interface{}) (err error)
Tracex(logID, format string, a ...interface{}) (err error)
Noticex(logID, format string, a ...interface{}) (err error)
Warnx(logID, format string, a ...interface{}) (err error)
Fatalx(logID, format string, a ...interface{}) (err error)

Close()

}