Get all organisations exist in Github - require github token due to rate limiting

getallorgingithub.go

package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"os"
	"strings"
	"time"

	"github.com/google/go-github/github"
	"golang.org/x/oauth2"
)

func GetConn() (c *github.Client, err error) {
	err = nil
	ctx := context.Background()
	c = github.NewClient(&http.Client{})
	if os.Getenv("GITHUB_AUTH_TOKEN") != "" {
		ts := oauth2.StaticTokenSource(
			&oauth2.Token{AccessToken: os.Getenv("GITHUB_AUTH_TOKEN")},
		)
		tc := oauth2.NewClient(ctx, ts)
		c = github.NewClient(tc)
	}

	return c, nil
}

// type org struct {
// 	Id    int    `json:"id"`
// 	Login string `json:"login"`
// 	Url   string `json:"url"`
// }

func getListOrg(ctx context.Context, c *github.Client, since int, f *os.File) []string {
	result := []string{}
	orgs, r, err := c.Organizations.ListAll(ctx, &github.OrganizationsListOptions{Since: since, ListOptions: github.ListOptions{PerPage: 100}})
	// Poor man way to handle rate limit error :p
	for (err != nil) && (r.StatusCode == 403) {
		fmt.Println(err.Error())
		fmt.Println("Reached rate limit - backing off for 10 minutes")
		time.Sleep(time.Duration(10 * time.Minute))
		orgs, _, err = c.Organizations.ListAll(ctx, &github.OrganizationsListOptions{Since: since, ListOptions: github.ListOptions{PerPage: 100}})
	}

	if err != nil {
		log.Fatal(err)
	}

	for _, o := range orgs {
		if *o.ID > since {
			since = *o.ID
		}
		result = append(result, *o.Login)
	}
	if len(orgs) > 0 {
		f.Write([]byte(strings.Join(result, "\n")))
		result = append(result, getListOrg(ctx, c, since, f)...)
	}
	return result
}

func main() {
	c, err := GetConn()
	if err != nil {
		log.Fatal(err)
	}
	f, err := os.OpenFile("orgs.lst", os.O_APPEND|os.O_CREATE|os.O_RDWR, 0666)
	if err != nil {
		log.Fatal(err)
	}
	ctx := context.Background()
	since := 0
	_ = getListOrg(ctx, c, since, f)
}