import fs from 'fs';
import { isInCluster } from './_k8s';

const LOCAL_NAMESPACE = 'local';

class NamespaceCache {
  cache?: string;

  get() {
    if (!isInCluster()) {
      return LOCAL_NAMESPACE;
    }
    if (!this.cache) {
      try {
        const data = fs.readFileSync(
          '/var/run/secrets/kubernetes.io/serviceaccount/namespace',
          'utf8',
        );
        this.cache = data;
      } catch (err) {
        console.error(err);
      }
    }
    return this.cache;
  }
}

const namespace = new NamespaceCache();
export default namespace;