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Goã®ä»»æ„ã®Loggerã‚’ãƒã‚°ãƒãƒ¼ãƒ†ãƒ¼ãƒˆå¯¾å¿œã§ãã‚‹replaceablewriter | ãŠãらãã¯ãã‚Œã•ãˆã‚‚平凡ãªæ—¥ã€…
https://github.com/Songmu/replaceablewriter 表題ã®é€šã‚Šã§ã™ãŒã€io.Writer をラップã—㦠io.WriteCloser ã¨ã—ã¦æŒ¯ã‚‹èˆžã„ã€ãã®å†…部ã«ä¿æŒã—㟠io.Writer ã‚’å·®ã—替ãˆå¯èƒ½ã«ã™ã‚‹ãƒ©ã‚¤ãƒ–ラリを書ã„ãŸã€‚ 例ãˆã°ã€Goã®æ¨™æº–logã‚’ãƒã‚°ãƒãƒ¼ãƒ†ãƒ¼ãƒˆã—ãŸã„å ´åˆã«ã¯ä»¥ä¸‹ã®ã‚ˆã†ã«ã—ã¾ã™ã€‚ f, _ := os.OpenFile("20191001.log", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644) w := replaceablewriter.New(f) log.SetOutput(w) // 翌日ã«ãªã£ãŸã‚‰å·®ã—替ãˆã‚‹ f2, _ := os.OpenFile("20191002.log", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644) w.Repl
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