Ideal Logger Interface

logger.go

type Logger interface {
    // all levels + Prin
    Print(v ...interface{})
    Printf(format string, v ...interface{})
    Println(v ...interface{})
    Debug(v ...interface{})
    Debugf(format string, v ...interface{})
    Debugln(v ...interface{})
    Info(v ...interface{})
    Infof(format string, v ...interface{})
    Infoln(v ...interface{})
    Warn(v ...interface{})
    Warnf(format string, v ...interface{})
    Warnln(v ...interface{})
    Error(v ...interface{})
    Errorf(format string, v ...interface{})
    Errorln(v ...interface{})
    Fatal(v ...interface{})
    Fatalf(format string, v ...interface{})
    Fatalln(v ...interface{})
    Panic(v ...interface{})
    Panicf(format string, v ...interface{})
    Panicln(v ...interface{})

    // Prefix - chainable so it can create a logger instance, safe for concurrent use
    Prefix(prefix string) Logger
    // Prefixf to avoid having to use fmt.Sprintf whenever using this
    Prefixf(fromat string, v ...interface{}) Logger
    // fields for other formatters, acts like prefix be default
    WithField(k, v interface{}) Logger

    // Context stuff as explained earlier
    Ctx(ctx context.Context) (Logger, context.Context)
    SetCtxCallback(func(ctx context.Context, logger Logger) context.Context)
}