我应该在生产代码中使用fmt吗？

Question

I see a lot of Go code that looks like this:

func main() {
    response, _, err := http.Get("http://golang.org/")
    if err != nil {
        fmt.Printf("%s", err)
        os.Exit(1)
    }

    defer response.Body.Close()
    contents, err := ioutil.ReadAll(response.Body)
    if err != nil {
        fmt.Printf("%s", err)
        os.Exit(1)
    }

    fmt.Printf("%s
", string(contents))
}

My questions are:

1. In production, should I keep these fmt.Printf statements? Silly question I am sure but just checking

2. What logging options do you recommend for production code and also dev?

Answer 1

Thought it's acceptable to use printfs in some situation. It's better, in production environment to use different logging strategies.

For instance if your application is a daemon running in background you are going to miss all of your fmt.Printf unless you don't pipe them in a file.

A good way to do looging is to use log rotation (since you don't want to have incredibly huge files) instead of reinvent your own logrotate you can use standard packages or external packages based on your needs.

Golang provides a log package syslog subpackage that are optimal solution to do simple logging relying on the OS syslog.