内部变量可以动态变化的字符串

Question

I'm trying to setup an API in golang, for specific needs, I want to be able to have an environment variable that would contain an URL as string (i.e : "https://subdomain.api.com/version/query") and I want to be able to modify the bold parts within an API call.

I have no clue on how I could achieve this.

Thanks for your time,

Paul

Answer 1

There are many ways, one which allows the URL to be configured from the environment, then to have the url configured dynamically at runtime, would be to use a template.

You could expect a template from the ENV:

apiUrlFromEnv := "https://{{.Subdomin}}.api.com/{{.Version}}/query" // get from env

Modified From the docs:

type API struct {
    Subdomain string
    Version   string
}
api := API{"testapi", "1.1"}
tmpl, err := template.New("api").Parse(apiUrlFromEnv)
if err != nil { panic(err) }
err = tmpl.Execute(os.Stdout, api) // write to buffer so you can get a string?
if err != nil { panic(err) }