logs and logos

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λόγος (logos) – Meaning "word," "speech," "reason," or "account."

(This is where "log" (as in a record or logbook) comes from.)

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Common log interface for personal projects. Some features I wanted:

• Print function that always logs, regardless of level.
• Convenience functions like Debug, Info, and Error.
• No separate Debugf, Infof, Errorf functions.
• "With" statements for adding context.
• Ability to change log levels and names.
• Ability to change log formats.
• Ability to user a logger on its own, or set it as a default logger.

Logos is my own implementation that was born out of this exercise. I found much of the configuration for the existing loggers tedious and unnecessarily heavy-weight.

It is simple to use and modify. Getting started:

    log := logos.NewLogger(levels.Debug, formats.Console, os.Stdout)
    log.Debug("logos ...")

You can set it as a default logger so you don't have to pass the logger around.

    logs.SetDefaultLogger(log)
    logs.Debug("default ...")

If you want to change log levels, and names, do whatever you like. Note that this is a global change. If you are running multiple loggers, this could cause a problem. Example:

func main() {
    const (
        LevelApple levels.Level = iota
        LevelBanana
        LevelCherry
    )
    
    levels.LevelNames = map[levels.Level]string{
        LevelApple:  "apple",
        LevelBanana: "banana",
        LevelCherry: "cherry",
    }
    
    levels.LevelColors = map[levels.Level]colors.TextColor{
        LevelApple:  colors.TextGreen,
        LevelBanana: colors.TextYellow,
        LevelCherry: colors.TextRed,
    }
    
    log := logos.NewLogger(LevelApple, formats.Console, os.Stdout)
    log.Log(LevelApple, "apple ...")
    log.Log(LevelBanana, "banana ...")
    log.Log(LevelCherry, "cherry ...")
}

If you want to use the Zap logger:

func main() {
    log := contrib.NewZapLogger(levels.Debug, formats.Console, os.Stdout)
    log.Log(levels.Debug, "debug %s ...", "zap")
    log.Log(levels.Info, "info %s ...", "zap")
    log.Log(levels.Warn, "warn %s ...", "zap")
}

SLog:

func main() {
    log = contrib.NewSLogLogger(levels.Debug, formats.Console, os.Stdout)
    log.Log(levels.Debug, "debug %s ...", "slog")
    log.Log(levels.Info, "info %s ...", "slog")
    log.Log(levels.Warn, "warn %s ...", "slog")
}

Logrus:

func main() {
    log = contrib.NewLogrusLogger(levels.Debug, formats.Console, os.Stdout)
    log.Log(levels.Debug, "debug %s ...", "logrus")
    log.Log(levels.Info, "info %s ...", "logrus")
    log.Log(levels.Warn, "warn %s ...", "logrus")
}