connection.js
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/*!
* Module dependencies.
*/
var MongooseConnection = require('../../connection');
var STATES = require('../../connectionstate');
/**
* A [node-mongodb-native](https://github.com/mongodb/node-mongodb-native) connection implementation.
*
* @inherits Connection
* @api private
*/
function NativeConnection() {
MongooseConnection.apply(this, arguments);
this._listening = false;
}
/**
* Expose the possible connection states.
* @api public
*/
NativeConnection.STATES = STATES;
/*!
* Inherits from Connection.
*/
NativeConnection.prototype.__proto__ = MongooseConnection.prototype;
/**
* Switches to a different database using the same connection pool.
*
* Returns a new connection object, with the new db.
*
* @param {String} name The database name
* @return {Connection} New Connection Object
* @api public
*/
NativeConnection.prototype.useDb = function(name, options) {
// Return immediately if cached
if (options && options.useCache && this.relatedDbs[name]) return this.relatedDbs[name];
// we have to manually copy all of the attributes...
var newConn = new this.constructor();
newConn.name = name;
newConn.base = this.base;
newConn.collections = {};
newConn.models = {};
newConn.replica = this.replica;
newConn.hosts = this.hosts;
newConn.host = this.host;
newConn.port = this.port;
newConn.user = this.user;
newConn.pass = this.pass;
newConn.options = this.options;
newConn._readyState = this._readyState;
newConn._closeCalled = this._closeCalled;
newConn._hasOpened = this._hasOpened;
newConn._listening = false;
// First, when we create another db object, we are not guaranteed to have a
// db object to work with. So, in the case where we have a db object and it
// is connected, we can just proceed with setting everything up. However, if
// we do not have a db or the state is not connected, then we need to wait on
// the 'open' event of the connection before doing the rest of the setup
// the 'connected' event is the first time we'll have access to the db object
var _this = this;
if (this.db && this._readyState === STATES.connected) {
wireup();
} else {
this.once('connected', wireup);
}
function wireup() {
newConn.client = _this.client;
newConn.db = _this.client.db(name);
newConn.onOpen();
// setup the events appropriately
listen(newConn);
}
newConn.name = name;
// push onto the otherDbs stack, this is used when state changes
this.otherDbs.push(newConn);
newConn.otherDbs.push(this);
// push onto the relatedDbs cache, this is used when state changes
if (options && options.useCache) {
this.relatedDbs[newConn.name] = newConn;
newConn.relatedDbs = this.relatedDbs;
}
return newConn;
};
/*!
* Register listeners for important events and bubble appropriately.
*/
function listen(conn) {
if (conn.db._listening) {
return;
}
conn.db._listening = true;
conn.db.on('close', function(force) {
if (conn._closeCalled) return;
// the driver never emits an `open` event. auto_reconnect still
// emits a `close` event but since we never get another
// `open` we can't emit close
if (conn.db.serverConfig.autoReconnect) {
conn.readyState = STATES.disconnected;
conn.emit('close');
return;
}
conn.onClose(force);
});
conn.db.on('error', function(err) {
conn.emit('error', err);
});
conn.db.on('reconnect', function() {
conn.readyState = STATES.connected;
conn.emit('reconnect');
conn.emit('reconnected');
conn.onOpen();
});
conn.db.on('timeout', function(err) {
conn.emit('timeout', err);
});
conn.db.on('open', function(err, db) {
if (STATES.disconnected === conn.readyState && db && db.databaseName) {
conn.readyState = STATES.connected;
conn.emit('reconnect');
conn.emit('reconnected');
}
});
conn.db.on('parseError', function(err) {
conn.emit('parseError', err);
});
}
/**
* Closes the connection
*
* @param {Boolean} [force]
* @param {Function} [fn]
* @return {Connection} this
* @api private
*/
NativeConnection.prototype.doClose = function(force, fn) {
this.client.close(force, fn);
return this;
};
/*!
* Module exports.
*/
module.exports = NativeConnection;