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/**
* Creates and manages the Mongo connection pool
*
* @type {exports}
*/
var Promise = require('es6-promise').Promise;
var mongo = require('mongodb');
var MongoClient = mongo.MongoClient;
var _ = require('underscore');
// Store all instantiated connections.
var connections = [];
module.exports = function() {
return {
/**
* Gets a Mongo connection from the pool.
*
* If the connection pool has not been instantiated yet, it is first
* instantiated and a connection is returned.
*
* @returns {Promise|Db} - A promise object that resolves to a Mongo db object.
*/
getConnection: function getConnection(connectionString) {
return new Promise(function(resolve, reject) {
// If connectionString is null or undefined, return an error.
if (_.isEmpty(connectionString)) {
return reject('getConnection must be called with a mongo connection string');
}
// Check if a connection already exists for the provided connectionString.
var pool = _.findWhere(connections, { connectionString: connectionString });
// If a connection pool was found, resolve the promise with it.
if (pool) {
return resolve(pool.db);
}
// If the connection pool has not been instantiated,
// instantiate it and return the connection.
MongoClient.connect(connectionString, function(err, database) {
if (err) {
return reject(err);
}
// Store the connection in the connections array.
connections.push({
connectionString: connectionString,
db: database
});
return resolve(database);
});
});
},
/**
* Exposes Mongo ObjectID function.
*
* @returns {Function} - Mongo ObjectID function
*/
ObjectID: function() {
return mongo.ObjectID();
}
};
}();
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