idct/symfony-async-monolog-handler

Simple toolchain for Symfony 6+ framework and Monolog which allows sending logs using the symfony/messenger asynchronously.

Installation

composer require idct/symfony-async-monolog-handler

Usage

As this is not a bundle, but a library which acts as a toolchain you need to execute three steps before it actually works:

1. Register the service in your services.yaml:

    monolog.handler.async-stream:
        class: IDCT\Logger\Monolog\Handler\AsyncMessageHandler
        public: false

2. Choose which real handler should be actually executed. For example if you have:

    file_log:
        type: stream
        # log to var/log/(environment).log
        path: "%kernel.logs_dir%/async-test.log"
        # log *all* messages (debug is lowest level)
        level: debug

in your monolog.yaml then add to services.yaml:

    IDCT\Logger\Messenger\AsyncLogMessageHandler:
        arguments:
            - '@monolog.handler.file_log'

3. Add you asynchronous channel, for example name it async, then to monolog.yaml add:

monolog:
    channels:
        - async

4. In monolog.yaml register your async proxy logger:

    async-stream:
        type: 'service'
        id: 'monolog.handler.async-stream'
        channels: ['async']
        level: debug

where id must match the identifier of a service from step 1.

5. Whenever you want to use your async logger inject it using standard symfony + monolog naming convention which include channel's name:

    public function __construct(protected LoggerInterface $asyncLogger)
    {
        
    }

6. Register a transport for your async messages in messenger.yaml:

framework:
    messenger:
        transports:
            async: '%env(MESSENGER_TRANSPORT_DSN)%'

        routing:
            # Route your messages to the transports
            'IDCT\Logger\Model\AsyncLogMessage': async

7. Be sure to set MESSENGER_TRANSPORT_DSN env variable.

8. Activate symfony/messenger.

9. Note: Target handler will handle the message even if its channels' list does not match. This can be useful to filter out other messages, for example the target handler may be set to ignore messenger logs:

    file_log:
        type: stream
        # log to var/log/(environment).log
        path: "%kernel.logs_dir%/async-test.log"
        # log *all* messages (debug is lowest level)
        channels: ['!messenger']
        level: debug

Contribution

Any contribution towards better testing is more than welcome. In tests/func you can already find a preconfigured symfony which tests the solution when app:test (TestCommand.php) is executed.