Metdata ServerからProjectIDを取得するサンプル

meta-projectid.go

package main

import (
	"fmt"
	"io/ioutil"
	"net/http"
)

const MetadataServerURL = "http://metadata.google.internal/computeMetadata/v1/project/"

func main() {
	fmt.Println(getProjectID())
}

func getProjectID() (string, error) {
	client := &http.Client{}

	req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/project-id", MetadataServerURL), nil)
	req.Header.Add("Metadata-Flavor", "Google")

	resp, err := client.Do(req)
	if err != nil {
		return "", err
	}
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}
	return string(body), nil
}