native-mongo-util

native-mongo-util

Utility package to connect multiple mongo databases. Supports SSH tunneling.

Usage

• Connect single db by configuring mongdb url in MONGO_URL env var.

  export MONGO_URL=mongodb://localhost/test
  

  Code to connect the above db & get mongo collection instance.

  const { connect, getCollection } = require('native-mongo-util');
  
  (async () => {
    try {
      await connect({ poolSize: 20 }); // connect to db with options to MongoClient
  
      const userCollection = getCollection('user');
      const allUsers = await userCollection.find().toArray();
      console.log(allUsers);
    } catch (err) {
      console.log('Error ocurred while connecting DB', err);
      throw err;
    }
  })();
  

• Connecting other mongo db

  const { newConnection } = require('native-mongo-util');
  
  (async () => {
    try {
      const mongoURL = 'mongodb://localhost/someOtherDB';
      const connection = newConnection(mongoURL, { poolSize: 20 }); // Provide mongo uri & MongoClient options
      await connection.connect(); // connect to someOtherDB
  
      const studentsCollection = connection.getCollection('students'); // get students collection from someOtherDB connection.
  
      const allUsers = await studentsCollection.find().toArray();
      console.log(allUsers);
    } catch (err) {
      console.log('Error ocurred while connecting DB', err);
      throw err;
    }
  })();
  

API

• exports.newConnection(mongoURL, options) Function will create & return new Connection class instance. mongoURL is valid mongodb connection string. options is MongoClient options

• async exports.connect(options) Async function that connects to mongodb, using MONGO_URL env var. MongoClient options can also be passed. Returns Mongodb DB class instance

• exports.getCollection(collectionName) Returns Mongodb collection (Collection instance) for collectionName.

• async exports.getClient() Returns Mongodb MongoClient class instance

• exports.getDBName() Returns connected mongodb name

• Class Connection methods

  • constructor(mongoURL, options) Valid mongodb connection string and MongoClient options
  • async connect() Async method connects to mongodb, using mongoURL for the same instance. Returns Mongodb DB class instance
  • getCollection(collectionName) Returns mongodb collection.
  • getDBName() Returns db name
  • async getClient() Returns Mongodb MongoClient instance.

Environment Variables

• MONGO_URL Mongo connection url
• PROCESS_EXIT_ON_MONGO_ERROR Prevent node process exit on any Mongo error. Default value is true.
• SSH_HOST ssh hostname or ip
• SSH_USER ssh user for remote connection
• SSH_PASSWORD ssh connection password
• SSH_KEY_PATH ssh private key path like ~/.ssh/id_rsa. Either of SSH_PASSWORD or SSH_KEY_PATH must be provided depending on remote server auth mode.