firebase_db-initialize.go

ctx := context.Background()

// configure database URL
conf := &firebase.Config{
	DatabaseURL: "https://fir-realtime-db-demo-xxxxx-default-rtdb.asia-southeast1.firebasedatabase.app",
}

// fetch service account key
opt := option.WithCredentialsFile("fir-realtime-db-demo-xxxxx-firebase-adminsdk-2zjoi-9b40ce1e42.json")

app, err := firebase.NewApp(ctx, conf, opt)
if err != nil {
	log.Fatalln("error in initializing firebase app: ", err)
}

client, err := app.Database(ctx)
if err != nil {
	log.Fatalln("error in creating firebase DB client: ", err)
}