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import { MongoClient, Database } from "../deps.ts";import { MetaDataStorage } from "./metadata.ts";export function ConnectMongo() {  const client = new MongoClient();  const { mongo_uri, use_mongo, mongo_database } = MetaDataStorage.envConfig;  if (!use_mongo) {    throw " not open use_mongo flag";  }  if (!mongo_uri || !mongo_database) {    throw "do not found mongo_uri or mongo_database";  }  client.connectWithUri(MetaDataStorage.envConfig.mongo_uri!);  return client.database(MetaDataStorage.envConfig.mongo_database!);}
export class DinarDatabase {  private static _mongo: Database;  static getMongoDBInstance() {    if (!this._mongo) {      console.log("try to connect mongodb...");      this._mongo = ConnectMongo();    }    return this._mongo;  }}