Connection pooling with Sailsjs

Question

Since there is not documentation about how to create connection poolings with Sailsjs, I've being searching a little bit about it and I've found that sails-mysql adapter do have any pooling configuration in it but is related to tests:

{
    host: process.env.WATERLINE_ADAPTER_TESTS_HOST || 'localhost',
    // (...)
    database: process.env.WATERLINE_ADAPTER_TESTS_DATABASE || 'sails_mysql',
    pool: true,
    connectionLimit: 10,
    waitForConnections: true
}

So I've tried to include pool: true to my connections.js file in Sails:

someMysqlServer: {
    adapter: 'sails-mysql',
    host: '127.0.0.1',
    user: 'root',
    password: '',
    pool: true,
    database: 'mydatabase'
},

Server still runs and I recover data from the database but I'm not sure at all about if I have set connection throw a pooling service. Is there any way to check this feature?

Thanks.

Answer 1

Everything is there in codes

you can see the codes of sails-mysql(node modules) and you will find the solution for your doubts for sure. in sails-mysql module the main js is node-modules/sails-mysql/lib/adapter.js (according to node-modules/sails-mysql/package.json). so in adapter.js file you can see..

/*--codes--*/
var _spawnConnection = require('./connections/spawn');
/*--codes--*/
defaults: {
  pool: true,
  connectionLimit: 5,
  waitForConnections: true
},
/*--codes--*/

which is setting for to use pool by default with connectionLimit 5.

Now go to the file node-modules/sails-mysql/lib/connections/spawn.js there you see this snippet.

/*--codes--*/
/*--codes--*/
  if (connectionObject.connection.pool) {
    connectionObject.connection.pool.getConnection(function (err, conn) {
      afterwards(err, conn);
    });
    return;
  }

  // Use a new connection each time
  var conn = mysql.createConnection(connectionObject.config);
  conn.connect(function (err) {
    afterwards(err, conn);
  });
  return;
/*--codes--*/
/*--codes--*/

here it check if the adapter is set to use pool or not if it is pool:true then a connection is spawned from pool other wise a lone connection is used without pooling...

Now coming to your doubt....in your config/connections.js if u define an adapter like

mysqlServerMaster: {
    adapter: 'sails-mysql',
    host: 'localhost',
    user: 'root',
    password: 'root',
    pool: false,
    database: 'payments_db'
},

then you are using mysql without pooling.

and else If this setting you use...

mysqlServerMaster: {
    adapter: 'sails-mysql',
    host: 'localhost',
    user: 'root',
    password: 'root',
    pool: true,
    connectionLimit: 10,
    database: 'payments_db'
},

then you are having a mysql connection pool with connectioLimit ===10 for sure. I hope you got it now. https://www.npmjs.com/package/sails-mysql