Added the handler_class option to customize a handler while keeping its original type.

Author: charliefancelli

config/schema/monolog-1.0.xsd

@@ -95,6 +95,7 @@
         <xsd:attribute name="slack-team" type="xsd:string" />
         <xsd:attribute name="region" type="xsd:string" />
         <xsd:attribute name="enabled" type="xsd:boolean" />
+        <xsd:attribute name="handler_class" type="xsd:string" />
     </xsd:complexType>
 
     <xsd:simpleType name="level">

src/DependencyInjection/Configuration.php

@@ -661,6 +661,7 @@ public function getConfigTreeBuilder(): TreeBuilder
                 ->end()
                 ->scalarNode('formatter')->end()
                 ->booleanNode('nested')->defaultFalse()->end()
+                ->scalarNode('handler_class')->defaultNull()->end()
             ->end();
 
         $this->addGelfSection($handlerNode);

src/DependencyInjection/MonologExtension.php

@@ -166,7 +166,15 @@ private function buildHandler(ContainerBuilder $container, $name, array $handler
             return $handlerId;
         }
 
-        $handlerClass = $this->getHandlerClassByType($handler['type']);
+        if (null !== $handler['handler_class']) {
+            $handlerClass = $handler['handler_class'];
+            if (!class_exists($handlerClass)) {
+                throw new \RuntimeException(sprintf('The handler class "%s" does not exist.', $handlerClass));
+            }
+        } else {
+            $handlerClass = $this->getHandlerClassByType($handler['type']);
+        }
+
         $definition = new Definition($handlerClass);
 
         if ($handler['include_stacktraces']) {