README

This Symfony 4 bundle provides a session handler for saving sessions in Cassandra.

Installation

1. Add the repository and requirement to composer.json:

    {
        "repositories": [
            {
                "type": "vcs",
                "url": "git@github.com:alfatraining/cassandra-session-handler-bundle.git"
            }
        ],
        "require": {
            "alfatraining/cassandra-session-handler-bundle": "dev-master"
        }
    }

1. Install the bundle via composer update or composer update nothing if you don't want updates.

2. Register the bundle in app/AppKernel.php:

    new Alfatraining\CassandraSessionHandlerBundle\AlfatrainingCassandraSessionHandlerBundle(),

1. Add configuration parameters to your app/config/config.yml (the following shows the bundle defaults) and activate the session handler:

    framework:
        session:
            handler_id:  alfatraining_cassandra_session_handler.cassandra_session_handler

    alfatraining_cassandra_session_handler:
        keyspace:         symfony2_sessions    # Cassandra keyspace to use
        column_family:    sessions             # Cassandra table/column family to use
        session_lifetime: 84600                # session lifetime in seconds

1. Add parameters to app/config/parameters.yml.dist to configure the Cassandra cluster instance:

    parameters:
        # contact points can be 1) a single node (not advisable for Cassandra)
        cassandra_cluster.contact_points:       localhost
        # or 2) a comma-separated list of nodes (mixed host names / IP addresses possible)
        cassandra_cluster.contact_points:       localhost, 127.0.0.1, 172.18.1.10
        # or 3) a native YAML array
        cassandra_cluster.contact_points:
        - localhost
        - 127.0.0.1
        # of course, you may also write this using the inline style
        cassandra_cluster.contact_points:       [localhost, 127.0.0.1]

        # optionally set the credentials to be used for connecting to the Cassandra cluster
        cassandra_cluster.credentials.username: cassandra
        cassandra_cluster.credentials.password: cassandra

In Symfony 4, you can use an environnement variable which contains comma-separated values as a string :

# services.yaml
parameters: 
    cassandra_cluster.contact_points: '%env(string:CASSANDRA_CLUSTER_HOSTS)%'

# .env.local
CASSANDRA_CLUSTER_HOSTS=10.0.0.1,10.0.0.2,10.0.0.3

Then run composer install again or update your parameters.yml by hand.

1. Don't forget to actually create the keyspace and the column family. An example of the CQL that's needed can be found in Resources/doc/create_session_keyspace_and_table.sql inside this bundle.

As you can see in the Resources/config/services.yml file you need to pass a Cassandra\Cluster (it's an interface even if it doesn't like one) instance to the session handler upon instantiation. Because the DefaultCluster has a lot of configuration options (for SSL, authentication and a whole lot more – see http://datastax.github.io/php-driver/api/Cassandra/Cluster/class.Builder/ for more information) you may replace this class entirely and just instantiate your own custom cluster class instance. Here's how:

1. Replace the class name to use in your app/config/config.yml file:

    parameters:
        cassandra_cluster.class: Namespace/To/Your/Own/Class

1. Take a look at how the bundle's implementation works in Lib/Cassandra/Cluster.php.