Connecting to a MongoDB Database from Go

main.go

// package declaration and imports omitted for brevity

type key string

const (
	hostKey     = key("hostKey")
	usernameKey = key("usernameKey")
	passwordKey = key("passwordKey")
	databaseKey = key("databaseKey")
)

func main() {
	ctx := context.Background()
	ctx, cancel := context.WithCancel(ctx)
	defer cancel()
	ctx = context.WithValue(ctx, hostKey, os.Getenv("TODO_MONGO_HOST"))
	ctx = context.WithValue(ctx, usernameKey, os.Getenv("TODO_MONGO_USERNAME"))
	ctx = context.WithValue(ctx, passwordKey, os.Getenv("TODO_MONGO_PASSWORD"))
	ctx = context.WithValue(ctx, databaseKey, os.Getenv("TODO_MONGO_DATABASE"))
	db, err := configDB(ctx)
	if err != nil {
		log.Fatalf("todo: database configuration failed: %v", err)
	}
}