connection-manager.js
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'use strict';
const AbstractConnectionManager = require('../abstract/connection-manager');
const Utils = require('../../utils');
const debug = Utils.getLogger().debugContext('connection:mysql');
const Promise = require('../../promise');
const sequelizeErrors = require('../../errors');
const dataTypes = require('../../data-types').mysql;
const parserMap = new Map();
class ConnectionManager extends AbstractConnectionManager {
constructor(dialect, sequelize) {
super(dialect, sequelize);
this.sequelize = sequelize;
this.sequelize.config.port = this.sequelize.config.port || 3306;
try {
if (sequelize.config.dialectModulePath) {
this.lib = require(sequelize.config.dialectModulePath);
} else {
this.lib = require('mysql');
}
} catch (err) {
if (err.code === 'MODULE_NOT_FOUND') {
throw new Error('Please install mysql package manually');
}
throw err;
}
this.refreshTypeParser(dataTypes);
}
// Expose this as a method so that the parsing may be updated when the user has added additional, custom types
$refreshTypeParser(dataType) {
for (const type of dataType.types.mysql) {
parserMap.set(type, dataType.parse);
}
}
$clearTypeParser() {
parserMap.clear();
}
static $typecast(field, next) {
if (parserMap.has(field.type)) {
return parserMap.get(field.type)(field, this.sequelize.options);
}
return next();
}
connect(config) {
return new Promise((resolve, reject) => {
const connectionConfig = {
host: config.host,
port: config.port,
user: config.username,
password: config.password,
database: config.database,
timezone: this.sequelize.options.timezone,
typeCast: ConnectionManager.$typecast.bind(this),
bigNumberStrings: false,
supportBigNumbers: true
};
if (config.dialectOptions) {
for (const key of Object.keys(config.dialectOptions)) {
connectionConfig[key] = config.dialectOptions[key];
}
}
const connection = this.lib.createConnection(connectionConfig);
connection.connect(err => {
if (err) {
if (err.code) {
switch (err.code) {
case 'ECONNREFUSED':
reject(new sequelizeErrors.ConnectionRefusedError(err));
break;
case 'ER_ACCESS_DENIED_ERROR':
reject(new sequelizeErrors.AccessDeniedError(err));
break;
case 'ENOTFOUND':
reject(new sequelizeErrors.HostNotFoundError(err));
break;
case 'EHOSTUNREACH':
reject(new sequelizeErrors.HostNotReachableError(err));
break;
case 'EINVAL':
reject(new sequelizeErrors.InvalidConnectionError(err));
break;
default:
reject(new sequelizeErrors.ConnectionError(err));
break;
}
} else {
reject(new sequelizeErrors.ConnectionError(err));
}
return;
}
if (config.pool.handleDisconnects) {
// Connection to the MySQL server is usually
// lost due to either server restart, or a
// connnection idle timeout (the wait_timeout
// server variable configures this)
//
// See [stackoverflow answer](http://stackoverflow.com/questions/20210522/nodejs-mysql-error-connection-lost-the-server-closed-the-connection)
connection.on('error', err => {
if (err.code === 'PROTOCOL_CONNECTION_LOST') {
// Remove it from read/write pool
this.pool.destroy(connection);
}
debug(`connection error ${err.code}`);
});
}
debug(`connection acquired`);
resolve(connection);
});
}).tap(connection => {
connection.query("SET time_zone = '" + this.sequelize.options.timezone + "'"); /* jshint ignore: line */
});
}
disconnect(connection) {
// Dont disconnect connections with an ended protocol
// That wil trigger a connection error
if (connection._protocol._ended) {
debug(`connection tried to disconnect but was already at ENDED state`);
return Promise.resolve();
}
return new Promise((resolve, reject) => {
connection.end(err => {
if (err) return reject(new sequelizeErrors.ConnectionError(err));
debug(`connection disconnected`);
resolve();
});
});
}
validate(connection) {
return connection && ['disconnected', 'protocol_error'].indexOf(connection.state) === -1;
}
}
Utils._.extend(ConnectionManager.prototype, AbstractConnectionManager.prototype);
module.exports = ConnectionManager;
module.exports.ConnectionManager = ConnectionManager;
module.exports.default = ConnectionManager;