SilverStripe DynamoDB

This module enables storing SilverStripe sessions in DynamoDB.

Installation

Add these custom repositories to your composer.json

composer require silverstripe/dynamodb

Sessions with DynamoDB

If you wish to store sessions in DynamoDB, set the following environment variables in your _ss_environment.php file:

// the name of the DynamoDB table to store sessions in
define('AWS_DYNAMODB_SESSION_TABLE', 'mysession');

// the region that the DynamoDB table will live in (in this example here it uses Sydney)
define('AWS_REGION_NAME', 'ap-southeast-2');

Once these are in place, this module will configure DynamoDB and register that as the session handler. You will need to create the specified table using the AWS DynamoDB console for the region.

Using DynamoDB outside of AWS

Sometimes you'll want to test that DynamoDB sessions work on your local development environment. You can make that happen by defining AWS_ACCESS_KEY and AWS_ACCESS_SECRET. Please don't define these constants in the environment file in EC2 instances, as credentials are automatically handled by the IAM role inside of AWS.

// the AWS access key and secret. This is optional if you've configured an instance with an IAM role
// http://docs.aws.amazon.com/aws-sdk-php/guide/latest/credentials.html#caching-iam-role-credentials
define('AWS_ACCESS_KEY', '<access key here>');
define('AWS_ACCESS_SECRET', '<access secret here>');

Garbage collecting sessions

Inactive sessions are garbage collected by GarbageCollectSessionCronTask if silverstripe-crontask is setup on your instance. The time when a session should be collected after inactivity can be changed by setting Session::$timeout.

For example, in your application's config YAML file, this sets a 20 minute session timeout:

Session:
	timeout: 1200

You can also set the DynamoDB garbage collection time independently of Session::$timeout, but it's recommended you make it at least the value of Session::$timeout or greater.

For example, in your _ss_environment.php file, set garbage collection after 1 hour of inactivity in sessions:

define('AWS_DYNAMODB_SESSION_LIFETIME', 3600);

See http://docs.aws.amazon.com/aws-sdk-php/guide/latest/feature-dynamodb-session-handler.html for more information.