rva-vzw/krakboem-bundle

Symfony messenger implementation for rva-vzw/krakboem

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Type:symfony-bundle

v0.1.2 2024-01-11 21:29 UTC

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Last update: 2024-06-13 22:40:48 UTC


README

Me trying to create a Symfony bundle for rva-vzw/krakboem

(c) Johan Vervloet 2023, 2024

Licensed under AGPL v3 or later

This bundle tries to provide a Symfony implementation of the interfaces for event sourcing I created in rva-vzw/krakboem.

I use symfony messenger for the buses, syfmony normalizer for event normalization, and doctrine for the event store. (Which is not optimal. But it will do for now.)

If you install the bundle, it will set up the service container for you. But since I didn't find out yet how to configure doctrine and messenger in a bundle, that's something that needs to be done manually.

There's little documentation for this (experimental) bundle. But you might want to take a look how the projects below use it:

  • dikdikdik, my famous app to keep track of the score of the solo whist card game.
  • wdebelek, a web app to play card games. We used it in Covid times.
  • 1jg, another score app.

Installation instructions

composer require rva-vzw/krakboem-bundle

Configuration

messenger

The configuration of the buses:

# config/packages/messenger.yaml

framework:
  messenger:
    default_bus: messenger.bus.commands
    buses:
      messenger.bus.events:
        default_middleware: allow_no_handlers
        middleware:
          - 'RvaVzw\KrakBoemBundle\Messenger\EventStoreMiddleware'
      messenger.bus.commands:
      messenger.bus.replay:
        default_middleware: allow_no_handlers

You also need to tag your listeners, so that the correct bus handles the correct messages:

# config/services.yaml:

services:
  _instanceof:
    RvaVzw\KrakBoem\EventSourcing\EventListener\EventListener:
      tags: [{ name: messenger.message_handler, bus: messenger.bus.events }]
    RvaVzw\KrakBoem\EventSourcing\Replay\Replayable:
      tags: [{ name: messenger.message_handler, bus: messenger.bus.replay }]
    RvaVzw\KrakBoem\Cqrs\CommandBus\CommandHandler:
      tags: [{ name: messenger.message_handler, bus: messenger.bus.commands }]

doctrine

Regarding doctrine, I usually configure two entity managers: one for the event store, and one for the read model. This is the configuration I use for krakboem:

# config/packages/doctrine.yaml:

doctrine:
  dbal:
    url: '%env(resolve:DATABASE_URL)%'

    # IMPORTANT: You MUST configure your server version,
    # either here or in the DATABASE_URL env var (see .env file)
    #server_version: '15'
  orm:
    auto_generate_proxy_classes: true
    default_entity_manager: read_model
    proxy_dir: '%kernel.build_dir%/doctrine/orm/Proxies'
    entity_managers:
      read_model:
        naming_strategy: doctrine.orm.naming_strategy.underscore
        auto_mapping: true
        connection: default
        mappings:
          ReadModel:
            is_bundle: false
            dir: '%kernel.project_dir%/src/Infrastructure/ReadModel'
            prefix: 'App\Infrastructure\ReadModel'
            alias: ReadModel
      event_store:
        naming_strategy: doctrine.orm.naming_strategy.underscore
        connection: default
        mappings:
          EventStore:
            is_bundle: false
            dir: '%kernel.project_dir%/vendor/rva-vzw/krakboem-bundle/src/Doctrine'
            prefix: 'RvaVzw\KrakBoemBundle\Doctrine'
            alias: EventStore