How to set an config parameter from console argument? - symfony

Question

I'm a newbie in Symfony.
I trying to change Monolog output formatter by console argument 'format=json'.
In short, I want to run any console command with the way:
app/console my_command --format=json # xml / txt / my own
...and get output of LoggerInterface in requested format.
For example, I set the default formatter in configuration:
monolog:
handlers:
console:
type: console
channels: [!event, !doctrine]
formatter: json_formatter
services:
json_formatter:
class: Monolog\Formatter\JsonFormatter
When I create the some MyEventListener::onConsoleCommand (as described here), I cannot change the parameters bag because it is already compiled: "Impossible to call set() on a frozen ParameterBag."
Up2: My services config in this case looks like this:
services:
kernel.listener.command_dispatch:
class: My\Listener\MyEventListener
autowire: true
tags:
- { name: kernel.event_listener, event: console.command }
With another way, I can register console option inside initial file:
# app/console
$loader = require __DIR__.'/autoload.php';
# ...
$application->getDefinition()->addOption(
new InputOption(
'formatter',
'f',
InputOption::VALUE_OPTIONAL,
'The logs output formatter',
'json_formatter'
)
);
But I can't find a way to change parameters bag in the Container. Because $application->getKernel()->getContainer() is still empty.
So, how to change Symfony2 parameters from console input?
Alternatively, maybe I can just use some environments parameters? But how I can get an environment variable in YAML configuration?
Thank you.
UP3:
I have achieved the goal with environments variables like this:
SYMFONY__LOG__FORMATTER=json_formatter app/console my_command
monolog:
handlers:
console:
type: console
#...
formatter: '%log.formatter%'

Answer 1

The only point to modify command arguments for every registered command of your application is handling CommandEvents::COMMAND that is triggered before any command has been executed. So you can modify its arguments and read them as described here. Also, at this point you have your container compiled and it is not possible to modify service's definitions at this point. But you can get any service.
So i think you can end up with following handler:
class LogFormatterEventListener
{
private $container;
private $consoleHandler;
public function __construct(ContainerInterface $container, HandlerInterface $consoleHandler)
{
$this->container = $container;
$this->consoleHandler = $consoleHandler;
}
public function onConsoleCommand(ConsoleCommandEvent $event)
{
$inputDefinition = $event->getCommand()->getApplication()->getDefinition();
$inputDefinition->addOption(
new InputOption('logformat', null, InputOption::VALUE_OPTIONAL, 'Format of your logs', null)
);
// merge the application's input definition
$event->getCommand()->mergeApplicationDefinition();
$input = new ArgvInput();
// we use the input definition of the command
$input->bind($event->getCommand()->getDefinition());
$formatter = $input->getOption('logformat');
if ($formatter /** && $this->container->has($formatter) **/) {
$this->consoleHandler->setFormatter(
$this->container->get($formatter);
);
}
}
}

Answer 2

Here is alternative solution (compatible with common):
Configuration:
monolog:
handlers:
console:
type: console
channels: [!event, !doctrine]
formatter: "%log.formatter%"
services:
json_formatter:
class: Monolog\Formatter\JsonFormatter
Command execution:
# colored plain text
app/console my_command
# json
SYMFONY__LOG__FORMATTER=json_formatter app/console my_command