feature #52079 [HttpKernel] Add parameters kernel.runtime_mode and kernel.runtime_mode.*, all set from env var APP_RUNTIME_MODE (nicolas-grekas)

This PR was merged into the 6.4 branch.

Discussion
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[HttpKernel] Add parameters `kernel.runtime_mode` and `kernel.runtime_mode.*`, all set from env var `APP_RUNTIME_MODE`

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | Fix #51340
| License       | MIT
| Doc PR        | TODO

Alternative to #51408. I think this approach is simpler and more powerful.

Here, we ensure that the kernel always provides a new `kernel.runtime_mode` parameter. This parameter is an array derived by default from the `APP_RUNTIME_MODE` env var, using the `query_string` processor.

This also creates 3 new parameters that should be the most common: `kernel.runtime_mode.web`, `kernel.runtime_mode.cli`, and `kernel.runtime_mode.worker`.

A long-running server would typically set `APP_RUNTIME_MODE` to `web=1&worker=1` or `web=0&worker=1` when appropriate (eg https://github.com/php-runtime/frankenphp-symfony/ should do so when `FRANKENPHP_WORKER` is set.)

I screened the codebase and updated them all except cache pools (where the SAPI is used to enable/disable locking) and error renderers (where the SAPI is used to turn html-rendering on/off.) These require more work that could be done later on. There are a few other remaining usages of `PHP_SAPI` but these look not appropriate for the new flag.

Commits
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7c70aec37ad [HttpKernel] Add parameters `kernel.runtime_mode` and `kernel.runtime_mode.*`, all set from env var `APP_RUNTIME_MODE`

Author: fabpot

DependencyInjection/FrameworkExtension.php

@@ -1184,7 +1184,7 @@ private function registerDebugConfiguration(array $config, ContainerBuilder $con
             $container->setDefinition('debug.log_processor', $definition);
 
             $container->register('debug.debug_logger_configurator', DebugLoggerConfigurator::class)
-                ->setArguments([new Reference('debug.log_processor')]);
+                ->setArguments([new Reference('debug.log_processor'), '%kernel.runtime_mode.web%']);
         }
     }
 

Resources/config/debug_prod.php

@@ -32,6 +32,7 @@
             ->tag('monolog.logger', ['channel' => 'php'])
 
         ->set('debug.debug_handlers_listener', DebugHandlersListener::class)
+            ->args([null, param('kernel.runtime_mode.web')])
             ->tag('kernel.event_subscriber')
 
         ->set('debug.file_link_formatter', FileLinkFormatter::class)