https://github.com/Automattic/mongoose
Tip revision: 868f60259a6705c60badb7a3d67d6d48fc32f125 authored by Valeri Karpov on 16 August 2015, 18:23:59 UTC
release 4.1.3
release 4.1.3
Tip revision: 868f602
connection.js
/*!
* Module dependencies.
*/
var utils = require('./utils')
, EventEmitter = require('events').EventEmitter
, driver = global.MONGOOSE_DRIVER_PATH || 'node-mongodb-native'
, Schema = require('./schema')
, Collection = require('./drivers/' + driver + '/collection')
, STATES = require('./connectionstate')
, MongooseError = require('./error')
, muri = require('muri');
/*!
* Protocol prefix regexp.
*
* @api private
*/
var rgxProtocol = /^(?:.)+:\/\//;
/**
* Connection constructor
*
* For practical reasons, a Connection equals a Db.
*
* @param {Mongoose} base a mongoose instance
* @inherits NodeJS EventEmitter http://nodejs.org/api/events.html#events_class_events_eventemitter
* @event `connecting`: Emitted when `connection.{open,openSet}()` is executed on this connection.
* @event `connected`: Emitted when this connection successfully connects to the db. May be emitted _multiple_ times in `reconnected` scenarios.
* @event `open`: Emitted after we `connected` and `onOpen` is executed on all of this connections models.
* @event `disconnecting`: Emitted when `connection.close()` was executed.
* @event `disconnected`: Emitted after getting disconnected from the db.
* @event `close`: Emitted after we `disconnected` and `onClose` executed on all of this connections models.
* @event `reconnected`: Emitted after we `connected` and subsequently `disconnected`, followed by successfully another successfull connection.
* @event `error`: Emitted when an error occurs on this connection.
* @event `fullsetup`: Emitted in a replica-set scenario, when all nodes specified in the connection string are connected.
* @api public
*/
function Connection (base) {
this.base = base;
this.collections = {};
this.models = {};
this.config = {autoIndex: true};
this.replica = false;
this.hosts = null;
this.host = null;
this.port = null;
this.user = null;
this.pass = null;
this.name = null;
this.options = null;
this.otherDbs = [];
this._readyState = STATES.disconnected;
this._closeCalled = false;
this._hasOpened = false;
}
/*!
* Inherit from EventEmitter
*/
Connection.prototype.__proto__ = EventEmitter.prototype;
/**
* Connection ready state
*
* - 0 = disconnected
* - 1 = connected
* - 2 = connecting
* - 3 = disconnecting
*
* Each state change emits its associated event name.
*
* ####Example
*
* conn.on('connected', callback);
* conn.on('disconnected', callback);
*
* @property readyState
* @api public
*/
Object.defineProperty(Connection.prototype, 'readyState', {
get: function(){ return this._readyState; }
, set: function (val) {
if (!(val in STATES)) {
throw new Error('Invalid connection state: ' + val);
}
if (this._readyState !== val) {
this._readyState = val;
// loop over the otherDbs on this connection and change their state
for (var i=0; i < this.otherDbs.length; i++) {
this.otherDbs[i].readyState = val;
}
if (STATES.connected === val)
this._hasOpened = true;
this.emit(STATES[val]);
}
}
});
/**
* A hash of the collections associated with this connection
*
* @property collections
*/
Connection.prototype.collections;
/**
* The mongodb.Db instance, set when the connection is opened
*
* @property db
*/
Connection.prototype.db;
/**
* A hash of the global options that are associated with this connection
*
* @property global
*/
Connection.prototype.config;
/**
* Opens the connection to MongoDB.
*
* `options` is a hash with the following possible properties:
*
* config - passed to the connection config instance
* db - passed to the connection db instance
* server - passed to the connection server instance(s)
* replset - passed to the connection ReplSet instance
* user - username for authentication
* pass - password for authentication
* auth - options for authentication (see http://mongodb.github.com/node-mongodb-native/api-generated/db.html#authenticate)
*
* ####Notes:
*
* Mongoose forces the db option `forceServerObjectId` false and cannot be overridden.
* Mongoose defaults the server `auto_reconnect` options to true which can be overridden.
* See the node-mongodb-native driver instance for options that it understands.
*
* _Options passed take precedence over options included in connection strings._
*
* @param {String} connection_string mongodb://uri or the host to which you are connecting
* @param {String} [database] database name
* @param {Number} [port] database port
* @param {Object} [options] options
* @param {Function} [callback]
* @see node-mongodb-native https://github.com/mongodb/node-mongodb-native
* @see http://mongodb.github.com/node-mongodb-native/api-generated/db.html#authenticate
* @api public
*/
Connection.prototype.open = function (host, database, port, options, callback) {
var parsed;
if ('string' === typeof database) {
switch (arguments.length) {
case 2:
port = 27017;
break;
case 3:
switch (typeof port) {
case 'function':
callback = port, port = 27017;
break;
case 'object':
options = port, port = 27017;
break;
}
break;
case 4:
if ('function' === typeof options)
callback = options, options = {};
}
} else {
switch (typeof database) {
case 'function':
callback = database, database = undefined;
break;
case 'object':
options = database;
database = undefined;
callback = port;
break;
}
if (!rgxProtocol.test(host)) {
host = 'mongodb://' + host;
}
try {
parsed = muri(host);
} catch (err) {
this.error(err, callback);
return this;
}
database = parsed.db;
host = parsed.hosts[0].host || parsed.hosts[0].ipc;
port = parsed.hosts[0].port || 27017;
}
this.options = this.parseOptions(options, parsed && parsed.options);
// make sure we can open
if (STATES.disconnected !== this.readyState) {
var err = new Error('Trying to open unclosed connection.');
err.state = this.readyState;
this.error(err, callback);
return this;
}
if (!host) {
this.error(new Error('Missing hostname.'), callback);
return this;
}
if (!database) {
this.error(new Error('Missing database name.'), callback);
return this;
}
// authentication
if (options && options.user && options.pass) {
this.user = options.user;
this.pass = options.pass;
} else if (parsed && parsed.auth) {
this.user = parsed.auth.user;
this.pass = parsed.auth.pass;
// Check hostname for user/pass
} else if (/@/.test(host) && /:/.test(host.split('@')[0])) {
host = host.split('@');
var auth = host.shift().split(':');
host = host.pop();
this.user = auth[0];
this.pass = auth[1];
} else {
this.user = this.pass = undefined;
}
// global configuration options
if (options && options.config) {
if (options.config.autoIndex === false){
this.config.autoIndex = false;
}
else {
this.config.autoIndex = true;
}
}
this.name = database;
this.host = host;
this.port = port;
this._open(callback);
return this;
};
/**
* Opens the connection to a replica set.
*
* ####Example:
*
* var db = mongoose.createConnection();
* db.openSet("mongodb://user:pwd@localhost:27020/testing,mongodb://example.com:27020,mongodb://localhost:27019");
*
* The database name and/or auth need only be included in one URI.
* The `options` is a hash which is passed to the internal driver connection object.
*
* Valid `options`
*
* db - passed to the connection db instance
* server - passed to the connection server instance(s)
* replset - passed to the connection ReplSetServer instance
* user - username for authentication
* pass - password for authentication
* auth - options for authentication (see http://mongodb.github.com/node-mongodb-native/api-generated/db.html#authenticate)
* mongos - Boolean - if true, enables High Availability support for mongos
*
* _Options passed take precedence over options included in connection strings._
*
* ####Notes:
*
* _If connecting to multiple mongos servers, set the `mongos` option to true._
*
* conn.open('mongodb://mongosA:27501,mongosB:27501', { mongos: true }, cb);
*
* Mongoose forces the db option `forceServerObjectId` false and cannot be overridden.
* Mongoose defaults the server `auto_reconnect` options to true which can be overridden.
* See the node-mongodb-native driver instance for options that it understands.
*
* _Options passed take precedence over options included in connection strings._
*
* @param {String} uris comma-separated mongodb:// `URI`s
* @param {String} [database] database name if not included in `uris`
* @param {Object} [options] passed to the internal driver
* @param {Function} [callback]
* @see node-mongodb-native https://github.com/mongodb/node-mongodb-native
* @see http://mongodb.github.com/node-mongodb-native/api-generated/db.html#authenticate
* @api public
*/
Connection.prototype.openSet = function (uris, database, options, callback) {
if (!rgxProtocol.test(uris)) {
uris = 'mongodb://' + uris;
}
switch (arguments.length) {
case 3:
switch (typeof database) {
case 'string':
this.name = database;
break;
case 'object':
callback = options;
options = database;
database = null;
break;
}
if ('function' === typeof options) {
callback = options;
options = {};
}
break;
case 2:
switch (typeof database) {
case 'string':
this.name = database;
break;
case 'function':
callback = database, database = null;
break;
case 'object':
options = database, database = null;
break;
}
}
var parsed;
try {
parsed = muri(uris);
} catch (err) {
this.error(err, callback);
return this;
}
if (!this.name) {
this.name = parsed.db;
}
this.hosts = parsed.hosts;
this.options = this.parseOptions(options, parsed && parsed.options);
this.replica = true;
if (!this.name) {
this.error(new Error('No database name provided for replica set'), callback);
return this;
}
// authentication
if (options && options.user && options.pass) {
this.user = options.user;
this.pass = options.pass;
} else if (parsed && parsed.auth) {
this.user = parsed.auth.user;
this.pass = parsed.auth.pass;
} else {
this.user = this.pass = undefined;
}
// global configuration options
if (options && options.config) {
if (options.config.autoIndex === false){
this.config.autoIndex = false;
}
else {
this.config.autoIndex = true;
}
}
this._open(callback);
return this;
};
/**
* error
*
* Graceful error handling, passes error to callback
* if available, else emits error on the connection.
*
* @param {Error} err
* @param {Function} callback optional
* @api private
*/
Connection.prototype.error = function (err, callback) {
if (callback) return callback(err);
this.emit('error', err);
};
/**
* Handles opening the connection with the appropriate method based on connection type.
*
* @param {Function} callback
* @api private
*/
Connection.prototype._open = function (callback) {
this.readyState = STATES.connecting;
this._closeCalled = false;
var self = this;
var method = this.replica
? 'doOpenSet'
: 'doOpen';
// open connection
this[method](function (err) {
if (err) {
self.readyState = STATES.disconnected;
if (self._hasOpened) {
if (callback) callback(err);
} else {
self.error(err, callback);
}
return;
}
self.onOpen(callback);
});
};
/**
* Called when the connection is opened
*
* @api private
*/
Connection.prototype.onOpen = function (callback) {
var self = this;
function open(err, isAuth) {
if (err) {
self.readyState = isAuth ? STATES.unauthorized : STATES.disconnected;
if (self._hasOpened) {
if (callback) callback(err);
} else {
self.error(err, callback);
}
return;
}
self.readyState = STATES.connected;
// avoid having the collection subscribe to our event emitter
// to prevent 0.3 warning
for (var i in self.collections)
self.collections[i].onOpen();
callback && callback();
self.emit('open');
}
// re-authenticate
if (self.user && self.pass) {
self.db.authenticate(self.user, self.pass, self.options.auth, function(err) {
open(err, true);
});
} else {
open();
}
};
/**
* Closes the connection
*
* @param {Function} [callback] optional
* @return {Connection} self
* @api public
*/
Connection.prototype.close = function (callback) {
var self = this;
this._closeCalled = true;
switch (this.readyState){
case 0: // disconnected
callback && callback();
break;
case 1: // connected
case 4: // unauthorized
this.readyState = STATES.disconnecting;
this.doClose(function(err){
if (err){
self.error(err, callback);
} else {
self.onClose();
callback && callback();
}
});
break;
case 2: // connecting
this.once('open', function(){
self.close(callback);
});
break;
case 3: // disconnecting
if (!callback) break;
this.once('close', function () {
callback();
});
break;
}
return this;
};
/**
* Called when the connection closes
*
* @api private
*/
Connection.prototype.onClose = function () {
this.readyState = STATES.disconnected;
// avoid having the collection subscribe to our event emitter
// to prevent 0.3 warning
for (var i in this.collections)
this.collections[i].onClose();
this.emit('close');
};
/**
* Retrieves a collection, creating it if not cached.
*
* Not typically needed by applications. Just talk to your collection through your model.
*
* @param {String} name of the collection
* @param {Object} [options] optional collection options
* @return {Collection} collection instance
* @api public
*/
Connection.prototype.collection = function (name, options) {
if (!(name in this.collections))
this.collections[name] = new Collection(name, this, options);
return this.collections[name];
};
/**
* Defines or retrieves a model.
*
* var mongoose = require('mongoose');
* var db = mongoose.createConnection(..);
* db.model('Venue', new Schema(..));
* var Ticket = db.model('Ticket', new Schema(..));
* var Venue = db.model('Venue');
*
* _When no `collection` argument is passed, Mongoose produces a collection name by passing the model `name` to the [utils.toCollectionName](#utils_exports.toCollectionName) method. This method pluralizes the name. If you don't like this behavior, either pass a collection name or set your schemas collection name option._
*
* ####Example:
*
* var schema = new Schema({ name: String }, { collection: 'actor' });
*
* // or
*
* schema.set('collection', 'actor');
*
* // or
*
* var collectionName = 'actor'
* var M = conn.model('Actor', schema, collectionName)
*
* @param {String} name the model name
* @param {Schema} [schema] a schema. necessary when defining a model
* @param {String} [collection] name of mongodb collection (optional) if not given it will be induced from model name
* @see Mongoose#model #index_Mongoose-model
* @return {Model} The compiled model
* @api public
*/
Connection.prototype.model = function (name, schema, collection) {
// collection name discovery
if ('string' == typeof schema) {
collection = schema;
schema = false;
}
if (utils.isObject(schema) && !(schema instanceof Schema)) {
schema = new Schema(schema);
}
if (this.models[name] && !collection) {
// model exists but we are not subclassing with custom collection
if (schema instanceof Schema && schema != this.models[name].schema) {
throw new MongooseError.OverwriteModelError(name);
}
return this.models[name];
}
var opts = { cache: false, connection: this };
var model;
if (schema instanceof Schema) {
// compile a model
model = this.base.model(name, schema, collection, opts);
// only the first model with this name is cached to allow
// for one-offs with custom collection names etc.
if (!this.models[name]) {
this.models[name] = model;
}
model.init();
return model;
}
if (this.models[name] && collection) {
// subclassing current model with alternate collection
model = this.models[name];
schema = model.prototype.schema;
var sub = model.__subclass(this, schema, collection);
// do not cache the sub model
return sub;
}
// lookup model in mongoose module
model = this.base.models[name];
if (!model) {
throw new MongooseError.MissingSchemaError(name);
}
if (this == model.prototype.db
&& (!collection || collection == model.collection.name)) {
// model already uses this connection.
// only the first model with this name is cached to allow
// for one-offs with custom collection names etc.
if (!this.models[name]) {
this.models[name] = model;
}
return model;
}
return this.models[name] = model.__subclass(this, schema, collection);
};
/**
* Returns an array of model names created on this connection.
* @api public
* @return {Array}
*/
Connection.prototype.modelNames = function () {
return Object.keys(this.models);
};
/*!
* Module exports.
*/
Connection.STATES = STATES;
module.exports = Connection;