cgm-remote-monitor/lib/api3/storage/mongoCollection/index.js

'use strict';

/**
 * Storage implementation using mongoDB
 * @param {Object} ctx
 * @param {Object} env
 * @param {string} colName - name of the collection in mongo database
 */
function MongoCollection (ctx, env, colName) {

  const self = this
    , utils = require('./utils')
    , find = require('./find')
    , modify = require('./modify')
    ;

  self.colName = colName;

  self.col = ctx.store.collection(colName);

  ctx.store.ensureIndexes(self.col, [ 'identifier',
    'srvModified',
    'isValid'
  ]);


  self.identifyingFilter = utils.identifyingFilter;

  self.findOne = (...args) => find.findOne(self.col, ...args);

  self.findOneFilter = (...args) => find.findOneFilter(self.col, ...args);

  self.findMany = (...args) => find.findMany(self.col, ...args);

  self.insertOne = (...args) => modify.insertOne(self.col, ...args);

  self.replaceOne = (...args) => modify.replaceOne(self.col, ...args);

  self.updateOne = (...args) => modify.updateOne(self.col, ...args);

  self.deleteOne = (...args) => modify.deleteOne(self.col, ...args);

  self.deleteManyOr = (...args) => modify.deleteManyOr(self.col, ...args);


  /**
   * Get server version
   */
  self.version = async function version () {

    const result = await ctx.store.db.admin().buildInfo();

    return {
      storage: 'mongodb',
      version: result.version
    };
  };


  /**
   * Get timestamp (e.g. srvModified) of the last modified document
   */
  self.getLastModified = async function getLastModified (fieldName) {

    const [ result ] = await self.col.find()
      .sort({ [fieldName]: -1 })
      .limit(1)
      .project({ [fieldName]: 1 })
      .toArray();

    return result;
  }
}

module.exports = MongoCollection;