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This is how the module is built, for version 4 and higher.
Most of the information is however valid with the previous versions too.
The upgrade module aims to be a PrestaShop module AND be as independent as possible. Which means its content can be reached from several way:
Every module developer will recognize its content. This file is used to manage the module part of the project: installation, uninstallation, then automatic redirection to the next file.
This controller uses the AdminController features from PrestaShop. It allows the upgrade configuration to be displayed in the back office. The merchant will see the configuration options.
In previous versions it was used to handle everything, displaying answers, handle and dispatching requests… In the latest version, its responsibilities were restricted, which should be displaying the configuration page.
This file is called from ajax requests. This is the only file responsible of the initialization and upgrade / rollback steps. This file is not a PrestaShop controller for a simple but important reason, we do not want to rely on the core during an upgrade or a rollback, this would increase the risk of crashes.
This is the equivalent of
ajax-upgradetab.php file for CLI calls. It will instantiate some specific features to the CLI, like a logger displaying informations on the fly. This entrypoint is also useful for testing, or for a user who does not want to use the web version.
The objective is to have a single module version to handle these PrestaShop upgrades:
The other versions are not supported anymore. We recommend to use the previous versions of the module available on the PrestaShop marketplace.
Aim is to help as many merchants as possible to upgrade from 1.6 to 1.7. This required to do the following implementation choices:
Even if Smarty is still provided by the core, it was decided to use an independent engine template.
This makes sure than replacing the core template engine won’t break the module later.
Dependencies between the core and the module are limited, because the upgrade will modify classes the modules might need, it is important to avoid relying on them.
A 100% independent module would be great, but because some features absolutely need the core, it is not achievable. So it was tried to avoiding, when possible, using the core logic. This is mainly until the UpgradeDb step, in order to avoid some undefined methods coming from the new files.
The best compromise was to separate requests (even the CLI one) in several steps.
By doing so, a new fresh core can be started with its updated classes.
The class Upgrade was introduced to the core around version 18.104.22.168.
So far the main objective has been to make the PHP code easier to understand and improve the robustness of the upgrade process where possible. The interface will be improved in future releases to be more user-friendly.
Most of the PHP classes in
classes folder are mainly logic extracted from AdminSelfUpgrade, the class that was responsible of everything in previous versions. It has been split in smaller parts.
Classes are gathered by responsibilities:
In order to work properly, the upgrade module needs to write some files to your filesystem server. These files are stored in the following folders, all available in the
<admin folder>/autoupgrade path.