Symfony - log to multiple log files in a service - symfony

Question

I'm trying to inject multiple monolog handler into a service. Right now my parent class injects a logger and the children class injects another logger. My goal is it to be able to log specific actions to specific log files.
My service.yaml:
App\Services\PrinterManager:
arguments: ['#doctrine.orm.entity_manager','#logger', '', '', '', '','']
tags:
- { name: monolog.logger, channel: printerface}
App\Services\Printer\Printer:
autowire: true
autoconfigure: false
public: false
parent: App\Services\PrinterManager
arguments:
index_2: '#logger'
index_3: '#oneup_flysystem.printer_invoice_filesystem'
index_4: '#oneup_flysystem.printerface_content_filesystem'
index_5: '#oneup_flysystem.sftp_filesystem'
index_6: '#App\Services\PrinterApiService'
tags:
- { name: monolog.logger, channel: printerlog}
My monolog.yaml:
monolog:
handlers:
main:
type: stream
path: "%kernel.logs_dir%/%kernel.environment%.log"
level: debug
channels: ["!event, !printerface", "!printerlog"]
printerface:
type: stream
level: debug
channels: ["printerface"]
path: "%kernel.logs_dir%/printerface.log"
printerlog:
type: stream
level: debug
channels: ["printerlog"]
path: "%kernel.logs_dir%/printerlog.log"
But it seems that the current service configuration breaks the constructor and I get the following error:
The argument must be an existing index or the name of a constructor's parameter.
Is there any way to use two log files in a service?

Answer 1

I've not done it with a parent/child class, but with something a little simpler I'm using named parameters, this is what I have (with three different loggers):
# App/Subscribers/WebhookLoggingListener.php file
public function __construct(
LoggerInterface $logger,
LoggerInterface $mailgunLog,
LoggerInterface $dripLog) {
}
# services.yml
App\Subscribers\WebhookLoggingListener:
arguments:
$logger: "#logger"
$mailgunLog: "#monolog.logger.mailgun"
$dripLog: "#monolog.logger.drip"
tags:
- { name: kernel.event_listener, event: kernel.request, method: onKernelRequest }
If I was using the other loggers elsewhere I could also bind them to specific variable names:
services:
_defaults:
# ... other config
bind:
$dripLog: "#?monolog.logger.drip"

Answer 2

This is the method that Symfony is using to replace parent's arguments in a child service:
/**
* You should always use this method when overwriting existing arguments
* of the parent definition.
*
* If you directly call setArguments() keep in mind that you must follow
* certain conventions when you want to overwrite the arguments of the
* parent definition, otherwise your arguments will only be appended.
*
* #param int|string $index
* #param mixed $value
*
* #return self the current instance
*
* #throws InvalidArgumentException when $index isn't an integer
*/
public function replaceArgument($index, $value)
{
if (\is_int($index)) {
$this->arguments['index_'.$index] = $value;
} elseif (0 === strpos($index, '$')) {
$this->arguments[$index] = $value;
} else {
throw new InvalidArgumentException('The argument must be an existing index or the name of a constructor\'s parameter.');
}
return $this;
}
As you can see, the indexes must be eighter same the argument variable names in the parent's constructor with a prefixed $ or an integer indicating the related argument.
So I think you must define your child service as below:
App\Services\Printer\Printer:
autowire: true
autoconfigure: false
public: false
parent: App\Services\PrinterManager
arguments:
2: '#logger'
3: '#oneup_flysystem.printer_invoice_filesystem'
4: '#oneup_flysystem.printerface_content_filesystem'
5: '#oneup_flysystem.sftp_filesystem'
6: '#App\Services\PrinterApiService'
tags:
- { name: monolog.logger, channel: printerlog}
Update:
After I reproduced your problem, I figured out that the solution is as below. With this solution, the Symfony autowiring will work for the child service.
App\Services\Printer\Printer:
autowire: true
autoconfigure: false
public: false
parent: App\Services\PrinterManager
arguments:
$arg2: '#logger'
$arg3: '#oneup_flysystem.printer_invoice_filesystem'
$arg4: '#oneup_flysystem.printerface_content_filesystem'
$arg5: '#oneup_flysystem.sftp_filesystem'
$arg6: '#App\Services\PrinterApiService'
tags:
- { name: monolog.logger, channel: printerlog}
$arg2, $arg3, $arg4, $arg5 and $arg6 must be replaced by your class constructor's argument names.