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connection.js
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connection.js
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'use strict';
/*!
* Module dependencies.
*/
const ChangeStream = require('./cursor/ChangeStream');
const EventEmitter = require('events').EventEmitter;
const Schema = require('./schema');
const Collection = require('./driver').get().Collection;
const STATES = require('./connectionstate');
const MongooseError = require('./error/index');
const PromiseProvider = require('./promise_provider');
const ServerSelectionError = require('./error/serverSelection');
const applyPlugins = require('./helpers/schema/applyPlugins');
const promiseOrCallback = require('./helpers/promiseOrCallback');
const get = require('./helpers/get');
const immediate = require('./helpers/immediate');
const mongodb = require('mongodb');
const pkg = require('../package.json');
const utils = require('./utils');
const parseConnectionString = require('mongodb/lib/core').parseConnectionString;
const arrayAtomicsSymbol = require('./helpers/symbols').arrayAtomicsSymbol;
const sessionNewDocuments = require('./helpers/symbols').sessionNewDocuments;
let id = 0;
/*!
* A list of authentication mechanisms that don't require a password for authentication.
* This is used by the authMechanismDoesNotRequirePassword method.
*
* @api private
*/
const noPasswordAuthMechanisms = [
'MONGODB-X509'
];
/**
* 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.openUri()` 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 successful connection.
* @event `error`: Emitted when an error occurs on this connection.
* @event `fullsetup`: Emitted after the driver has connected to primary and all secondaries if specified in the connection string.
* @api public
*/
function Connection(base) {
this.base = base;
this.collections = {};
this.models = {};
this.config = { autoIndex: true };
this.replica = false;
this.options = null;
this.otherDbs = []; // FIXME: To be replaced with relatedDbs
this.relatedDbs = {}; // Hashmap of other dbs that share underlying connection
this.states = STATES;
this._readyState = STATES.disconnected;
this._closeCalled = false;
this._hasOpened = false;
this.plugins = [];
this.id = id++;
}
/*!
* 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
* @memberOf Connection
* @instance
* @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;
// [legacy] loop over the otherDbs on this connection and change their state
for (const db of this.otherDbs) {
db.readyState = val;
}
// loop over relatedDbs on this connection and change their state
for (const k in this.relatedDbs) {
this.relatedDbs[k].readyState = val;
}
if (STATES.connected === val) {
this._hasOpened = true;
}
this.emit(STATES[val]);
}
}
});
/**
* Gets the value of the option `key`. Equivalent to `conn.options[key]`
*
* ####Example:
*
* conn.get('test'); // returns the 'test' value
*
* @param {String} key
* @method get
* @api public
*/
Connection.prototype.get = function(key) {
return get(this.options, key);
};
/**
* Sets the value of the option `key`. Equivalent to `conn.options[key] = val`
*
* Supported options include:
*
* - `maxTimeMS`: Set [`maxTimeMS`](/docs/api.html#query_Query-maxTimeMS) for all queries on this connection.
* - `useFindAndModify`: Set to `false` to work around the [`findAndModify()` deprecation warning](/docs/deprecations.html#findandmodify)
*
* ####Example:
*
* conn.set('test', 'foo');
* conn.get('test'); // 'foo'
* conn.options.test; // 'foo'
*
* @param {String} key
* @param {Any} val
* @method set
* @api public
*/
Connection.prototype.set = function(key, val) {
this.options = this.options || {};
this.options[key] = val;
return val;
};
/**
* A hash of the collections associated with this connection
*
* @property collections
* @memberOf Connection
* @instance
* @api public
*/
Connection.prototype.collections;
/**
* The name of the database this connection points to.
*
* ####Example
*
* mongoose.createConnection('mongodb://localhost:27017/mydb').name; // "mydb"
*
* @property name
* @memberOf Connection
* @instance
* @api public
*/
Connection.prototype.name;
/**
* A [POJO](https://masteringjs.io/tutorials/fundamentals/pojo) containing
* a map from model names to models. Contains all models that have been
* added to this connection using [`Connection#model()`](/docs/api/connection.html#connection_Connection-model).
*
* ####Example
*
* const conn = mongoose.createConnection();
* const Test = conn.model('Test', mongoose.Schema({ name: String }));
*
* Object.keys(conn.models).length; // 1
* conn.models.Test === Test; // true
*
* @property models
* @memberOf Connection
* @instance
* @api public
*/
Connection.prototype.models;
/**
* A number identifier for this connection. Used for debugging when
* you have [multiple connections](/docs/connections.html#multiple_connections).
*
* ####Example
*
* // The default connection has `id = 0`
* mongoose.connection.id; // 0
*
* // If you create a new connection, Mongoose increments id
* const conn = mongoose.createConnection();
* conn.id; // 1
*
* @property id
* @memberOf Connection
* @instance
* @api public
*/
Connection.prototype.id;
/**
* The plugins that will be applied to all models created on this connection.
*
* ####Example:
*
* const db = mongoose.createConnection('mongodb://localhost:27017/mydb');
* db.plugin(() => console.log('Applied'));
* db.plugins.length; // 1
*
* db.model('Test', new Schema({})); // Prints "Applied"
*
* @property plugins
* @memberOf Connection
* @instance
* @api public
*/
Object.defineProperty(Connection.prototype, 'plugins', {
configurable: false,
enumerable: true,
writable: true
});
/**
* The host name portion of the URI. If multiple hosts, such as a replica set,
* this will contain the first host name in the URI
*
* ####Example
*
* mongoose.createConnection('mongodb://localhost:27017/mydb').host; // "localhost"
*
* @property host
* @memberOf Connection
* @instance
* @api public
*/
Object.defineProperty(Connection.prototype, 'host', {
configurable: true,
enumerable: true,
writable: true
});
/**
* The port portion of the URI. If multiple hosts, such as a replica set,
* this will contain the port from the first host name in the URI.
*
* ####Example
*
* mongoose.createConnection('mongodb://localhost:27017/mydb').port; // 27017
*
* @property port
* @memberOf Connection
* @instance
* @api public
*/
Object.defineProperty(Connection.prototype, 'port', {
configurable: true,
enumerable: true,
writable: true
});
/**
* The username specified in the URI
*
* ####Example
*
* mongoose.createConnection('mongodb://val:psw@localhost:27017/mydb').user; // "val"
*
* @property user
* @memberOf Connection
* @instance
* @api public
*/
Object.defineProperty(Connection.prototype, 'user', {
configurable: true,
enumerable: true,
writable: true
});
/**
* The password specified in the URI
*
* ####Example
*
* mongoose.createConnection('mongodb://val:psw@localhost:27017/mydb').pass; // "psw"
*
* @property pass
* @memberOf Connection
* @instance
* @api public
*/
Object.defineProperty(Connection.prototype, 'pass', {
configurable: true,
enumerable: true,
writable: true
});
/**
* The mongodb.Db instance, set when the connection is opened
*
* @property db
* @memberOf Connection
* @instance
* @api public
*/
Connection.prototype.db;
/**
* A hash of the global options that are associated with this connection
*
* @property config
* @memberOf Connection
* @instance
* @api public
*/
Connection.prototype.config;
/**
* Helper for `createCollection()`. Will explicitly create the given collection
* with specified options. Used to create [capped collections](https://docs.mongodb.com/manual/core/capped-collections/)
* and [views](https://docs.mongodb.com/manual/core/views/) from mongoose.
*
* Options are passed down without modification to the [MongoDB driver's `createCollection()` function](http://mongodb.github.io/node-mongodb-native/2.2/api/Db.html#createCollection)
*
* @method createCollection
* @param {string} collection The collection to create
* @param {Object} [options] see [MongoDB driver docs](http://mongodb.github.io/node-mongodb-native/2.2/api/Db.html#createCollection)
* @param {Function} [callback]
* @return {Promise}
* @api public
*/
Connection.prototype.createCollection = _wrapConnHelper(function createCollection(collection, options, cb) {
if (typeof options === 'function') {
cb = options;
options = {};
}
this.db.createCollection(collection, options, cb);
});
/**
* _Requires MongoDB >= 3.6.0._ Starts a [MongoDB session](https://docs.mongodb.com/manual/release-notes/3.6/#client-sessions)
* for benefits like causal consistency, [retryable writes](https://docs.mongodb.com/manual/core/retryable-writes/),
* and [transactions](http://thecodebarbarian.com/a-node-js-perspective-on-mongodb-4-transactions.html).
*
* ####Example:
*
* const session = await conn.startSession();
* let doc = await Person.findOne({ name: 'Ned Stark' }, null, { session });
* await doc.remove();
* // `doc` will always be null, even if reading from a replica set
* // secondary. Without causal consistency, it is possible to
* // get a doc back from the below query if the query reads from a
* // secondary that is experiencing replication lag.
* doc = await Person.findOne({ name: 'Ned Stark' }, null, { session, readPreference: 'secondary' });
*
*
* @method startSession
* @param {Object} [options] see the [mongodb driver options](http://mongodb.github.io/node-mongodb-native/3.0/api/MongoClient.html#startSession)
* @param {Boolean} [options.causalConsistency=true] set to false to disable causal consistency
* @param {Function} [callback]
* @return {Promise<ClientSession>} promise that resolves to a MongoDB driver `ClientSession`
* @api public
*/
Connection.prototype.startSession = _wrapConnHelper(function startSession(options, cb) {
if (typeof options === 'function') {
cb = options;
options = null;
}
const session = this.client.startSession(options);
cb(null, session);
});
/**
* _Requires MongoDB >= 3.6.0._ Executes the wrapped async function
* in a transaction. Mongoose will commit the transaction if the
* async function executes successfully and attempt to retry if
* there was a retriable error.
*
* Calls the MongoDB driver's [`session.withTransaction()`](http://mongodb.github.io/node-mongodb-native/3.5/api/ClientSession.html#withTransaction),
* but also handles resetting Mongoose document state as shown below.
*
* ####Example:
*
* const doc = new Person({ name: 'Will Riker' });
* await db.transaction(async function setRank(session) {
* doc.rank = 'Captain';
* await doc.save({ session });
* doc.isNew; // false
*
* // Throw an error to abort the transaction
* throw new Error('Oops!');
* }).catch(() => {});
*
* // true, `transaction()` reset the document's state because the
* // transaction was aborted.
* doc.isNew;
*
* @method transaction
* @param {Function} fn Function to execute in a transaction
* @return {Promise<Any>} promise that resolves to the returned value of `fn`
* @api public
*/
Connection.prototype.transaction = function transaction(fn) {
return this.startSession().then(session => {
session[sessionNewDocuments] = new Map();
return session.withTransaction(() => fn(session)).
then(res => {
delete session[sessionNewDocuments];
return res;
}).
catch(err => {
// If transaction was aborted, we need to reset newly
// inserted documents' `isNew`.
for (const doc of session[sessionNewDocuments].keys()) {
const state = session[sessionNewDocuments].get(doc);
if (state.hasOwnProperty('isNew')) {
doc.isNew = state.isNew;
}
if (state.hasOwnProperty('versionKey')) {
doc.set(doc.schema.options.versionKey, state.versionKey);
}
for (const path of state.modifiedPaths) {
doc.$__.activePaths.paths[path] = 'modify';
doc.$__.activePaths.states.modify[path] = true;
}
for (const path of state.atomics.keys()) {
const val = doc.$__getValue(path);
if (val == null) {
continue;
}
val[arrayAtomicsSymbol] = state.atomics.get(path);
}
}
delete session[sessionNewDocuments];
throw err;
});
});
};
/**
* Helper for `dropCollection()`. Will delete the given collection, including
* all documents and indexes.
*
* @method dropCollection
* @param {string} collection The collection to delete
* @param {Function} [callback]
* @return {Promise}
* @api public
*/
Connection.prototype.dropCollection = _wrapConnHelper(function dropCollection(collection, cb) {
this.db.dropCollection(collection, cb);
});
/**
* Helper for `dropDatabase()`. Deletes the given database, including all
* collections, documents, and indexes.
*
* ####Example:
*
* const conn = mongoose.createConnection('mongodb://localhost:27017/mydb');
* // Deletes the entire 'mydb' database
* await conn.dropDatabase();
*
* @method dropDatabase
* @param {Function} [callback]
* @return {Promise}
* @api public
*/
Connection.prototype.dropDatabase = _wrapConnHelper(function dropDatabase(cb) {
// If `dropDatabase()` is called, this model's collection will not be
// init-ed. It is sufficiently common to call `dropDatabase()` after
// `mongoose.connect()` but before creating models that we want to
// support this. See gh-6967
for (const name of Object.keys(this.models)) {
delete this.models[name].$init;
}
this.db.dropDatabase(cb);
});
/*!
* ignore
*/
function _wrapConnHelper(fn) {
return function() {
const cb = arguments.length > 0 ? arguments[arguments.length - 1] : null;
const argsWithoutCb = typeof cb === 'function' ?
Array.prototype.slice.call(arguments, 0, arguments.length - 1) :
Array.prototype.slice.call(arguments);
const disconnectedError = new MongooseError('Connection ' + this.id +
' was disconnected when calling `' + fn.name + '`');
return promiseOrCallback(cb, cb => {
// Make it ok to call collection helpers before `mongoose.connect()`
// as long as `mongoose.connect()` is called on the same tick.
// Re: gh-8534
immediate(() => {
if (this.readyState === STATES.connecting) {
this.once('open', function() {
fn.apply(this, argsWithoutCb.concat([cb]));
});
} else if (this.readyState === STATES.disconnected && this.db == null) {
cb(disconnectedError);
} else {
fn.apply(this, argsWithoutCb.concat([cb]));
}
});
});
};
}
/**
* 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) {
callback(err);
return null;
}
if (this.listeners('error').length > 0) {
this.emit('error', err);
}
return Promise.reject(err);
};
/**
* Called when the connection is opened
*
* @api private
*/
Connection.prototype.onOpen = function() {
this.readyState = STATES.connected;
// avoid having the collection subscribe to our event emitter
// to prevent 0.3 warning
for (const i in this.collections) {
if (utils.object.hasOwnProperty(this.collections, i)) {
this.collections[i].onOpen();
}
}
this.emit('open');
};
/**
* Opens the connection with a URI using `MongoClient.connect()`.
*
* @param {String} uri The URI to connect with.
* @param {Object} [options] Passed on to http://mongodb.github.io/node-mongodb-native/2.2/api/MongoClient.html#connect
* @param {Boolean} [options.bufferCommands=true] Mongoose specific option. Set to false to [disable buffering](http://mongoosejs.com/docs/faq.html#callback_never_executes) on all models associated with this connection.
* @param {String} [options.dbName] The name of the database we want to use. If not provided, use database name from connection string.
* @param {String} [options.user] username for authentication, equivalent to `options.auth.user`. Maintained for backwards compatibility.
* @param {String} [options.pass] password for authentication, equivalent to `options.auth.password`. Maintained for backwards compatibility.
* @param {Number} [options.poolSize=5] The maximum number of sockets the MongoDB driver will keep open for this connection. By default, `poolSize` is 5. Keep in mind that, as of MongoDB 3.4, MongoDB only allows one operation per socket at a time, so you may want to increase this if you find you have a few slow queries that are blocking faster queries from proceeding. See [Slow Trains in MongoDB and Node.js](http://thecodebarbarian.com/slow-trains-in-mongodb-and-nodejs).
* @param {Boolean} [options.useUnifiedTopology=false] False by default. Set to `true` to opt in to the MongoDB driver's replica set and sharded cluster monitoring engine.
* @param {Number} [options.serverSelectionTimeoutMS] If `useUnifiedTopology = true`, the MongoDB driver will try to find a server to send any given operation to, and keep retrying for `serverSelectionTimeoutMS` milliseconds before erroring out. If not set, the MongoDB driver defaults to using `30000` (30 seconds).
* @param {Number} [options.heartbeatFrequencyMS] If `useUnifiedTopology = true`, the MongoDB driver sends a heartbeat every `heartbeatFrequencyMS` to check on the status of the connection. A heartbeat is subject to `serverSelectionTimeoutMS`, so the MongoDB driver will retry failed heartbeats for up to 30 seconds by default. Mongoose only emits a `'disconnected'` event after a heartbeat has failed, so you may want to decrease this setting to reduce the time between when your server goes down and when Mongoose emits `'disconnected'`. We recommend you do **not** set this setting below 1000, too many heartbeats can lead to performance degradation.
* @param {Boolean} [options.autoIndex=true] Mongoose-specific option. Set to false to disable automatic index creation for all models associated with this connection.
* @param {Boolean} [options.useNewUrlParser=false] False by default. Set to `true` to opt in to the MongoDB driver's new URL parser logic.
* @param {Boolean} [options.useCreateIndex=true] Mongoose-specific option. If `true`, this connection will use [`createIndex()` instead of `ensureIndex()`](/docs/deprecations.html#ensureindex) for automatic index builds via [`Model.init()`](/docs/api.html#model_Model.init).
* @param {Boolean} [options.useFindAndModify=true] True by default. Set to `false` to make `findOneAndUpdate()` and `findOneAndRemove()` use native `findOneAndUpdate()` rather than `findAndModify()`.
* @param {Number} [options.reconnectTries=30] If you're connected to a single server or mongos proxy (as opposed to a replica set), the MongoDB driver will try to reconnect every `reconnectInterval` milliseconds for `reconnectTries` times, and give up afterward. When the driver gives up, the mongoose connection emits a `reconnectFailed` event. This option does nothing for replica set connections.
* @param {Number} [options.reconnectInterval=1000] See `reconnectTries` option above.
* @param {Class} [options.promiseLibrary] Sets the [underlying driver's promise library](http://mongodb.github.io/node-mongodb-native/3.1/api/MongoClient.html).
* @param {Number} [options.bufferMaxEntries] This option does nothing if `useUnifiedTopology` is set. The MongoDB driver also has its own buffering mechanism that kicks in when the driver is disconnected. Set this option to 0 and set `bufferCommands` to `false` on your schemas if you want your database operations to fail immediately when the driver is not connected, as opposed to waiting for reconnection.
* @param {Number} [options.connectTimeoutMS=30000] How long the MongoDB driver will wait before killing a socket due to inactivity _during initial connection_. Defaults to 30000. This option is passed transparently to [Node.js' `socket#setTimeout()` function](https://nodejs.org/api/net.html#net_socket_settimeout_timeout_callback).
* @param {Number} [options.socketTimeoutMS=30000] How long the MongoDB driver will wait before killing a socket due to inactivity _after initial connection_. A socket may be inactive because of either no activity or a long-running operation. This is set to `30000` by default, you should set this to 2-3x your longest running operation if you expect some of your database operations to run longer than 20 seconds. This option is passed to [Node.js `socket#setTimeout()` function](https://nodejs.org/api/net.html#net_socket_settimeout_timeout_callback) after the MongoDB driver successfully completes.
* @param {Number} [options.family=0] Passed transparently to [Node.js' `dns.lookup()`](https://nodejs.org/api/dns.html#dns_dns_lookup_hostname_options_callback) function. May be either `0, `4`, or `6`. `4` means use IPv4 only, `6` means use IPv6 only, `0` means try both.
* @param {Function} [callback]
* @returns {Connection} this
* @api public
*/
Connection.prototype.openUri = function(uri, options, callback) {
if (typeof options === 'function') {
callback = options;
options = null;
}
if (['string', 'number'].indexOf(typeof options) !== -1) {
throw new MongooseError('Mongoose 5.x no longer supports ' +
'`mongoose.connect(host, dbname, port)` or ' +
'`mongoose.createConnection(host, dbname, port)`. See ' +
'http://mongoosejs.com/docs/connections.html for supported connection syntax');
}
if (typeof uri !== 'string') {
throw new MongooseError('The `uri` parameter to `openUri()` must be a ' +
`string, got "${typeof uri}". Make sure the first parameter to ` +
'`mongoose.connect()` or `mongoose.createConnection()` is a string.');
}
if (callback != null && typeof callback !== 'function') {
throw new MongooseError('3rd parameter to `mongoose.connect()` or ' +
'`mongoose.createConnection()` must be a function, got "' +
typeof callback + '"');
}
if (this.readyState === STATES.connecting || this.readyState === STATES.connected) {
if (this._connectionString !== uri) {
throw new MongooseError('Can\'t call `openUri()` on an active connection with ' +
'different connection strings. Make sure you aren\'t calling `mongoose.connect()` ' +
'multiple times. See: https://mongoosejs.com/docs/connections.html#multiple_connections');
}
if (typeof callback === 'function') {
callback(null, this);
}
return this;
}
this._connectionString = uri;
this.readyState = STATES.connecting;
this._closeCalled = false;
const Promise = PromiseProvider.get();
const _this = this;
if (options) {
options = utils.clone(options);
const autoIndex = options.config && options.config.autoIndex != null ?
options.config.autoIndex :
options.autoIndex;
if (autoIndex != null) {
this.config.autoIndex = autoIndex !== false;
delete options.config;
delete options.autoIndex;
}
if ('autoCreate' in options) {
this.config.autoCreate = !!options.autoCreate;
delete options.autoCreate;
}
if ('useCreateIndex' in options) {
this.config.useCreateIndex = !!options.useCreateIndex;
delete options.useCreateIndex;
}
if ('useFindAndModify' in options) {
this.config.useFindAndModify = !!options.useFindAndModify;
delete options.useFindAndModify;
}
// Backwards compat
if (options.user || options.pass) {
options.auth = options.auth || {};
options.auth.user = options.user;
options.auth.password = options.pass;
this.user = options.user;
this.pass = options.pass;
}
delete options.user;
delete options.pass;
if (options.bufferCommands != null) {
if (options.bufferMaxEntries == null) {
options.bufferMaxEntries = 0;
}
this.config.bufferCommands = options.bufferCommands;
delete options.bufferCommands;
}
if (options.useMongoClient != null) {
handleUseMongoClient(options);
}
} else {
options = {};
}
this._connectionOptions = options;
const dbName = options.dbName;
if (dbName != null) {
this.$dbName = dbName;
}
delete options.dbName;
if (!('promiseLibrary' in options)) {
options.promiseLibrary = PromiseProvider.get();
}
if (!('useNewUrlParser' in options)) {
if ('useNewUrlParser' in this.base.options) {
options.useNewUrlParser = this.base.options.useNewUrlParser;
} else {
options.useNewUrlParser = false;
}
}
if (!utils.hasUserDefinedProperty(options, 'useUnifiedTopology')) {
if (utils.hasUserDefinedProperty(this.base.options, 'useUnifiedTopology')) {
options.useUnifiedTopology = this.base.options.useUnifiedTopology;
} else {
options.useUnifiedTopology = false;
}
}
if (!utils.hasUserDefinedProperty(options, 'driverInfo')) {
options.driverInfo = {
name: 'Mongoose',
version: pkg.version
};
}
const parsePromise = new Promise((resolve, reject) => {
parseConnectionString(uri, options, (err, parsed) => {
if (err) {
return reject(err);
}
if (dbName) {
this.name = dbName;
} else if (parsed.defaultDatabase) {
this.name = parsed.defaultDatabase;
} else {
this.name = get(parsed, 'auth.db', null);
}
this.host = get(parsed, 'hosts.0.host', 'localhost');
this.port = get(parsed, 'hosts.0.port', 27017);
this.user = this.user || get(parsed, 'auth.username');
this.pass = this.pass || get(parsed, 'auth.password');
resolve();
});
});
const promise = new Promise((resolve, reject) => {
const client = new mongodb.MongoClient(uri, options);
_this.client = client;
client.connect((error) => {
if (error) {
_this.readyState = STATES.disconnected;
return reject(error);
}
_setClient(_this, client, options, dbName);
resolve(_this);
});
});
const serverSelectionError = new ServerSelectionError();
this.$initialConnection = Promise.all([promise, parsePromise]).
then(res => res[0]).
catch(err => {
if (err != null && err.name === 'MongoServerSelectionError') {
err = serverSelectionError.assimilateError(err);
}
if (this.listeners('error').length > 0) {
process.nextTick(() => this.emit('error', err));
}
throw err;
});
this.then = function(resolve, reject) {
return this.$initialConnection.then(resolve, reject);
};
this.catch = function(reject) {
return this.$initialConnection.catch(reject);
};
if (callback != null) {
this.$initialConnection = this.$initialConnection.then(
() => callback(null, this),
err => callback(err)
);
}
return this;
};
function _setClient(conn, client, options, dbName) {
const db = dbName != null ? client.db(dbName) : client.db();
conn.db = db;
conn.client = client;
const _handleReconnect = () => {
// If we aren't disconnected, we assume this reconnect is due to a
// socket timeout. If there's no activity on a socket for
// `socketTimeoutMS`, the driver will attempt to reconnect and emit
// this event.
if (conn.readyState !== STATES.connected) {
conn.readyState = STATES.connected;
conn.emit('reconnect');
conn.emit('reconnected');
conn.onOpen();
}
};
// `useUnifiedTopology` events
const type = get(db, 's.topology.s.description.type', '');
if (options.useUnifiedTopology) {
if (type === 'Single') {
const server = Array.from(db.s.topology.s.servers.values())[0];
server.s.topology.on('serverHeartbeatSucceeded', () => {
_handleReconnect();
});
server.s.pool.on('reconnect', () => {
_handleReconnect();
});
client.on('serverDescriptionChanged', ev => {
const newDescription = ev.newDescription;
if (newDescription.type === 'Standalone') {
_handleReconnect();
} else {
conn.readyState = STATES.disconnected;
}
});
} else if (type.startsWith('ReplicaSet')) {
client.on('topologyDescriptionChanged', ev => {
// Emit disconnected if we've lost connectivity to _all_ servers
// in the replica set.
const description = ev.newDescription;
const servers = Array.from(ev.newDescription.servers.values());
const allServersDisconnected = description.type === 'ReplicaSetNoPrimary' &&
servers.reduce((cur, d) => cur || d.type === 'Unknown', false);
if (conn.readyState === STATES.connected && allServersDisconnected) {
// Implicitly emits 'disconnected'
conn.readyState = STATES.disconnected;
} else if (conn.readyState === STATES.disconnected && !allServersDisconnected) {
_handleReconnect();
}
});
db.on('close', function() {
const type = get(db, 's.topology.s.description.type', '');
if (type !== 'ReplicaSetWithPrimary') {
// Implicitly emits 'disconnected'
conn.readyState = STATES.disconnected;
}
});
}
}
// Backwards compat for mongoose 4.x
db.on('reconnect', function() {
_handleReconnect();
});
db.s.topology.on('reconnectFailed', function() {
conn.emit('reconnectFailed');
});
if (!options.useUnifiedTopology) {
db.s.topology.on('left', function(data) {
conn.emit('left', data);
});
}
db.s.topology.on('joined', function(data) {
conn.emit('joined', data);
});
db.s.topology.on('fullsetup', function(data) {
conn.emit('fullsetup', data);
});
if (get(db, 's.topology.s.coreTopology.s.pool') != null) {
db.s.topology.s.coreTopology.s.pool.on('attemptReconnect', function() {
conn.emit('attemptReconnect');
});
}
if (!options.useUnifiedTopology || !type.startsWith('ReplicaSet')) {
db.on('close', function() {
// Implicitly emits 'disconnected'
conn.readyState = STATES.disconnected;
});
}
if (!options.useUnifiedTopology) {
client.on('left', function() {
if (conn.readyState === STATES.connected &&
get(db, 's.topology.s.coreTopology.s.replicaSetState.topologyType') === 'ReplicaSetNoPrimary') {
conn.readyState = STATES.disconnected;
}
});
}
db.on('timeout', function() {
conn.emit('timeout');
});
delete conn.then;
delete conn.catch;
conn.readyState = STATES.connected;
for (const i in conn.collections) {
if (utils.object.hasOwnProperty(conn.collections, i)) {
conn.collections[i].onOpen();
}
}
conn.emit('open');
}
/*!
* ignore
*/
const handleUseMongoClient = function handleUseMongoClient(options) {
console.warn('WARNING: The `useMongoClient` option is no longer ' +
'necessary in mongoose 5.x, please remove it.');
const stack = new Error().stack;
console.warn(stack.substr(stack.indexOf('\n') + 1));
delete options.useMongoClient;
};
/**
* Closes the connection
*
* @param {Boolean} [force] optional
* @param {Function} [callback] optional
* @return {Promise}
* @api public
*/
Connection.prototype.close = function(force, callback) {
if (typeof force === 'function') {
callback = force;
force = false;
}
this.$wasForceClosed = !!force;
return promiseOrCallback(callback, cb => {
this._close(force, cb);
});
};
/**
* Handles closing the connection
*
* @param {Boolean} force
* @param {Function} callback
* @api private
*/
Connection.prototype._close = function(force, callback) {
const _this = this;
this._closeCalled = true;
switch (this.readyState) {
case STATES.disconnected:
callback();
break;
case STATES.connected: