package internal import ( "context" "fmt" "log" "os" ) type Logging interface { Printf(ctx context.Context, format string, v ...interface{}) } type logger struct { log *log.Logger } func (l *logger) Printf(ctx context.Context, format string, v ...interface{}) { _ = l.log.Output(2, fmt.Sprintf(format, v...)) } // Logger calls Output to print to the stderr. // Arguments are handled in the manner of fmt.Print. var Logger Logging = &logger{ log: log.New(os.Stderr, "redis: ", log.LstdFlags|log.Lshortfile), }