README

Allows separate Symfony environments per tenant

Installation

Step 1: Download the Bundle

Open a command console, enter your project directory and execute the following command to download the latest stable version of this bundle:

$ composer require vivait/tenant-bundle

This command requires you to have Composer installed globally, as explained in the installation chapter of the Composer documentation.

Step 2: Enable the Bundle

Then, enable the bundle by adding the following line in the app/AppKernel.php file of your project:

<?php
// app/AppKernel.php

// ...
class AppKernel extends Kernel
{
    public function registerBundles()
    {
        $bundles = array(
            // ...

            new Vivait\TenantBundle\VivaitTenantBundle(),
        );

        // ...
    }

    // ...
}

Step 3: Altering your kernel to be tenanted

Because a kernel environment is immutable, we need to decipher the tenant before booting the kernel. We have created a tenanted kernel for your AppKernel to extend, which acts as a middleware to Symfony's Kernel. When using this middleware, you will need to implement a couple of methods.

The first abstract method, getAllTenants is used to return an array of Tenant objects. A number of providers are provided, although this could also implement custom logic, if needed.

The second abstract method, getCurrentTenantKey is used to locate the current tenant, so the kernel can alter the environment based on this. A number of locators are provided, although this could also implement custom logic, if needed.

Below is an example of the implementation of both of these, and if you're unsure what any of this means, is an advised starting point:

<?php
// app/AppKernel.php

use Symfony\Component\Config\Loader\LoaderInterface;
use Symfony\Component\HttpFoundation\Request;
use Vivait\TenantBundle\Kernel\TenantKernel;
use Vivait\TenantBundle\Locator\HostnameLocator;
use Vivait\TenantBundle\Provider\ConfigProvider;
use Vivait\TenantBundle\Provider\TenantProvider;

// ...
class AppKernel extends TenantKernel
{
	// ...

    /**
     * Provides an array of all Tenants
     *
     * @return Tenant[]
     */
    protected function getAllTenants()
    {
       $configProvider = new ConfigProvider( __DIR__ . '/config/' );
       return $configProvider->loadTenants();
    }

    /**
     * Provides the current tenant's key
     * @param Request $request
     * @return string The current tenant's key
     */
    protected function getCurrentTenantKey( Request $request )
    {
        return HostnameLocator::getTenantFromRequest( $request );
    }
}

Step 4: Creating environments for each tenant

An environment will be automatically created for each tenant by Symfony. However, if you choose to use the default AppKernel::registerContainerConfiguration method, as provided by Symfony, then you will need to create a new config file for each tenant environment. Each tenant environment is prefixed with 'tenant_', so if you have a tenant called 'mytenant', then you'd need to create 'app/config/config_tenant_mytenant.yml'. You can configure this behaviour by changing your AppKernel::registerContainerConfiguration method, but you will also need to customise the patterns used in ConfigProvider to match the change in config structure.

You could also use an alternative provider to provide a list of tenants, for example there is a YamlProvider that retrieves a list of tenants from a YAML file.

Running commands against tenants

Since each tenant now runs under a separate environment, when updating your application you'll need to run commands such as cache clear or doctrine migrations against each tenant's environment. A special binary has been provided to make this easier and is used by simply prefixing your usual command with the tenant binary:

bin/tenant php app/console cache:clear

This will automatically run the cache clear command against all tenants.

Parallel commands & daemons

If you want to run a command in parallel, for example a daemon command, then you can specify this using the -P option:

bin/tenant -P 10 php app/console my:daemon:command

In the example above, this will run the cache clear command for up to 10 tenants in parallel. If you specify -P as 0 then the binary will automatically set the number of processes to match the number of tenants.

Specifying specific tenants

You can specify specific tenants to run commands against using the -t option:

bin/tenant -t mytenant,anothertenant php app/console cache:clear

Other options

You can get a full list of options using -h:

bin/tenant -h