sails-mysql-live-select

A Sails connection adapter to use the mysql-live-select NPM Package in order to provide live (real time) result sets for models.

Example

See the chat room example application for a full working demonstration of this package.

Installation

To be used alongside the sails-mysql connection adapter.

MySQL server configuration

A MySQL server properly configured to output the binary log in ROW mode is required to use this adapter:

• Enable MySQL binlog in my.cnf, restart MySQL server after making the changes.

  # binlog config
  server-id        = 1
  binlog_format    = row
  log_bin          = /var/log/mysql/mysql-bin.log
  binlog_do_db     = employees   # optional
  expire_logs_days = 10          # optional
  max_binlog_size  = 100M        # optional
  

• Create an account with replication privileges:

  GRANT REPLICATION SLAVE, REPLICATION CLIENT, SELECT ON *.* TO 'user'@'localhost'

Package installation

1. Install the package:

   npm install --save sails-mysql-live-select

2. Add the connection settings to your config/connections.js:

     liveMysql: {
       adapter: 'sails-mysql-live-select',
       host: '127.0.0.1',
       // This user must have REPLICATION SLAVE, REPLICATION CLIENT and SELECT
       // privileges.
       user: 'USERNAME',
       password: 'PASSWORD',
       database: 'DATABASE',
       // Other settings used by mysql-live-select
       serverId: [Unique positive integer 1 - 2^32, default 1337]
       minInterval: [Minimum time in milliseconds between refresh]
     }

3. Add the adapter to be used on your models, for example in config/models.js:

     connection: [ 'mysql', 'liveMysql' ],

Usage

YourModel.liveFind(options, [condition])

This adapter adds a liveFind method to your models.

Argument	Type	Description
options	Object	Find options as defined by Waterline Query Language
condition	Function	Optional function for validating if result set should be refreshed on row change. See condition function documentation for mysql-live-select

The liveFind method returns a LiveMysqlSelect object as defined by mysql-live-select.

For example, listen for the update event in your controller actions to send changes to the client:

var myLiveSelect = MyModel.liveFind({},
  function(row, newRow, rowDeleted) {
    // Optional data invalidation callback
    // Check if data is invalidated by this row change
    console.log('Row data', row);
    return true;
  }
).on('update',
  function(diff, data) {
    // Results have changed, send to client
    sails.sockets.emit(req.socket.id, 'chatDiff', diff);
  }
);

When done listening for updates to a query, be sure to call the stop() method on the returned LiveMysqlSelect object to prevent memory leaks.

Running Tests

# Configure MySQL server settings
vim test/config/connections.js
# Run suite
npm test

Test execution code is in test/config/bootstrap.js.

License

MIT