README

This bundle provides a simple implementation of Google Pub/Sub transport for Symfony Messenger.

The bundle requires only symfony/messenger, google/cloud-pubsub and symfony/options-resolver packages. In contrast with Enqueue GPS transport, it doesn't require Enqueue and some bridge. It supports ordering messages with OrderingKeyStamp and it's not outdated.

Installation

Step 1: Install the Bundle

From within container execute the following command to download the latest version of the bundle:

$ composer require petitpress/gps-messenger-bundle --no-scripts

Step 2: Configure environment variables

Official Google Cloud PubSub SDK requires some globally accessible environment variables.

You might need to change default Symfony DotEnv instance to use putenv as Google needs to access some variables through getenv. To do so, use putenv method in config/bootstrap.php:

(new Dotenv())->usePutenv()->...

List of Google Pub/Sub configurable variables :

# use these for production environemnt:
GOOGLE_APPLICATION_CREDENTIALS='google-pubsub-credentials.json'
GCLOUD_PROJECT='project-id'

# use these for development environemnt (if you have installed Pub/Sub emulator):
PUBSUB_EMULATOR_HOST=http://localhost:8538

Step 3: Configure Symfony Messenger

# config/packages/messenger.yaml

framework:
    messenger:
        transports:
            gps_transport:
                dsn: 'gps://default'
                options:
                    key_file_path: /path/to/gcp-key.json #optional. Can be used instead of setting environment variables.
                    max_messages_pull: 10 # optional (default: 10)
                    topic: # optional (default name: messages)
                        name: 'messages'
                    queue: # optional (default the same as topic.name)
                        name: 'messages'
                    batch_size: 0 # optional (default: 0) If set above 0 it uses pubsubs batch publisher 

or:

# config/packages/messenger.yaml

framework:
    messenger:
        transports:
            gps_transport:
                dsn: 'gps://default/messages?max_messages_pull=10&key_file_path=/path/to/gcp-key.json'

Step 4: Use available stamps if needed

• OrderingKeyStamp: use for keeping messages of the same context in order. For more information, read an official documentation.