bug #21665 [DependencyInjection] Fix autowiring collisions detection (nicolas-grekas, GuilhemN)

This PR was merged into the 2.8 branch.

Discussion
----------

[DependencyInjection] Fix autowiring collisions detection

| Q             | A
| ------------- | ---
| Branch?       | 2.8
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        |

Fixes https://github.com/symfony/symfony/pull/21658 by implementing the second proposal of https://github.com/symfony/symfony/pull/21658#issuecomment-280858452:
> Another idea: store the types used previously and check that new services registered don't implement them.

Commits
-------

bb70472dce [DependencyInjection] Fix autowiring collisions detection
6f578ee514 [DI] Bug in autowiring collisions detection

src/Symfony/Component/DependencyInjection/Compiler/AutowirePass.php

@@ -28,6 +28,7 @@ class AutowirePass implements CompilerPassInterface
     private $definedTypes = array();
     private $types;
     private $notGuessableTypes = array();
+    private $usedTypes = array();
 
     /**
      * {@inheritdoc}
@@ -44,6 +45,15 @@ class AutowirePass implements CompilerPassInterface
                     $this->completeDefinition($id, $definition);
                 }
             }
+
+            foreach ($this->usedTypes as $type => $id) {
+                if (isset($this->usedTypes[$type]) && isset($this->notGuessableTypes[$type])) {
+                    $classOrInterface = class_exists($type) ? 'class' : 'interface';
+                    $matchingServices = implode(', ', $this->types[$type]);
+
+                    throw new RuntimeException(sprintf('Unable to autowire argument of type "%s" for the service "%s". Multiple services exist for this %s (%s).', $type, $id, $classOrInterface, $matchingServices));
+                }
+            }
         } catch (\Exception $e) {
         } catch (\Throwable $e) {
         }
@@ -56,6 +66,7 @@ class AutowirePass implements CompilerPassInterface
         $this->definedTypes = array();
         $this->types = null;
         $this->notGuessableTypes = array();
+        $this->usedTypes = array();
 
         if (isset($e)) {
             throw $e;
@@ -109,9 +120,11 @@ class AutowirePass implements CompilerPassInterface
 
                 if (isset($this->types[$typeHint->name]) && !isset($this->notGuessableTypes[$typeHint->name])) {
                     $value = new Reference($this->types[$typeHint->name]);
+                    $this->usedTypes[$typeHint->name] = $id;
                 } else {
                     try {
                         $value = $this->createAutowiredDefinition($typeHint, $id);
+                        $this->usedTypes[$typeHint->name] = $id;
                     } catch (RuntimeException $e) {
                         if ($parameter->allowsNull()) {
                             $value = null;

src/Symfony/Component/DependencyInjection/Tests/Compiler/AutowirePassTest.php

@@ -459,6 +459,31 @@ class AutowirePassTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEquals(array(new Reference('a'), '', new Reference('lille')), $container->getDefinition('foo')->getArguments());
     }
+
+    /**
+     * @dataProvider provideAutodiscoveredAutowiringOrder
+     *
+     * @expectedException \Symfony\Component\DependencyInjection\Exception\RuntimeException
+     * @expectedExceptionMEssage Unable to autowire argument of type "Symfony\Component\DependencyInjection\Tests\Compiler\CollisionInterface" for the service "a". Multiple services exist for this interface (autowired.Symfony\Component\DependencyInjection\Tests\Compiler\CollisionA, autowired.Symfony\Component\DependencyInjection\Tests\Compiler\CollisionB).
+     */
+    public function testAutodiscoveredAutowiringOrder($class)
+    {
+        $container = new ContainerBuilder();
+
+        $container->register('a', __NAMESPACE__.'\\'.$class)
+            ->setAutowired(true);
+
+        $pass = new AutowirePass();
+        $pass->process($container);
+    }
+
+    public function provideAutodiscoveredAutowiringOrder()
+    {
+        return array(
+            array('CannotBeAutowiredForwardOrder'),
+            array('CannotBeAutowiredReverseOrder'),
+        );
+    }
 }
 
 class Foo
@@ -540,6 +565,20 @@ class CannotBeAutowired
     }
 }
 
+class CannotBeAutowiredForwardOrder
+{
+    public function __construct(CollisionA $a, CollisionInterface $b, CollisionB $c)
+    {
+    }
+}
+
+class CannotBeAutowiredReverseOrder
+{
+    public function __construct(CollisionA $a, CollisionB $c, CollisionInterface $b)
+    {
+    }
+}
+
 class Lille
 {
 }