feature #15491 Add support for deprecated definitions (Taluu)

This PR was merged into the 2.8 branch.

Discussion
----------

Add support for deprecated definitions

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #14307
| License       | MIT
| Doc PR        | symfony/symfony-docs#5689

This add a sort of marker in the Definition of a service that marks it as "deprecated". This is useful when we have a bunch of service and a bunch of where it is used, and we need to track if there are any uses before removing it (in a later version or right now). I was not sure if the `trigger_error` would be enough, or if I should log them instead.

I'm first gathering some feedback, and then I'll try to update the doc.

I was not sure if it should target 2.8 or master (3.0) though.

What's left ?
==========
- [x] Make a POC
- [x] Gather some feedbacks
- [x] Dump the tag in XML, YAML and PHP
- [x] Load the definition from XML, YAML and PHP
- [x] Fix some forgotten things such as the key existence check
- [x] Work on inline services in the php dumper
- [x] Handle deprecations for decorators
- ~~Possibility to overwrite the deprecated flag in the decorators in `XmlFileLoader` ?~~ Nope, and this behavior is also ported to the `YamlFileLoader`.

Commits
-------

83f4e9c [DI] Support deprecated definitions in decorators
0b3d0a0 [DI] Allow to change the deprecation message in Definition
954247d [DI] Trigger a deprecated error on the container builder
2f37cb1 [DI] Dump the deprecated status
8f6c21c [DI] Supports the deprecated tag in loaders
4b6fab0 [DI] Add a deprecated status to definitions

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

@@ -127,6 +127,9 @@ private function resolveDefinition(ContainerBuilder $container, DefinitionDecora
         if ($parentDef->getFactoryService(false)) {
             $def->setFactoryService($parentDef->getFactoryService(false));
         }
+        if ($parentDef->isDeprecated()) {
+            $def->setDeprecated(true, $parentDef->getDeprecationMessage('%service_id%'));
+        }
         $def->setFactory($parentDef->getFactory());
         $def->setConfigurator($parentDef->getConfigurator());
         $def->setFile($parentDef->getFile());
@@ -162,6 +165,9 @@ private function resolveDefinition(ContainerBuilder $container, DefinitionDecora
         if (isset($changes['lazy'])) {
             $def->setLazy($definition->isLazy());
         }
+        if (isset($changes['deprecated'])) {
+            $def->setDeprecated($definition->isDeprecated(), $definition->getDeprecationMessage('%service_id%'));
+        }
         if (isset($changes['decorated_service'])) {
             $decoratedService = $definition->getDecoratedService();
             if (null === $decoratedService) {

src/Symfony/Component/DependencyInjection/ContainerBuilder.php

@@ -931,6 +931,10 @@ public function createService(Definition $definition, $id, $tryProxy = true)
             throw new RuntimeException(sprintf('You have requested a synthetic service ("%s"). The DIC does not know how to construct this service.', $id));
         }
 
+        if ($definition->isDeprecated()) {
+            @trigger_error($definition->getDeprecationMessage($id), E_USER_DEPRECATED);
+        }
+
         if ($tryProxy && $definition->isLazy()) {
             $container = $this;
 

src/Symfony/Component/DependencyInjection/Definition.php

@@ -30,6 +30,8 @@ class Definition
     private $factoryMethod;
     private $factoryService;
     private $shared = true;
+    private $deprecated = false;
+    private $deprecationTemplate = 'The "%service_id%" service is deprecated. You should stop using it, as it will soon be removed.';
     private $scope = ContainerInterface::SCOPE_CONTAINER;
     private $properties = array();
     private $calls = array();
@@ -829,6 +831,65 @@ public function isAbstract()
         return $this->abstract;
     }
 
+    /**
+     * Whether this definition is deprecated, that means it should not be called
+     * anymore.
+     *
+     * @param bool   $status
+     * @param string $template Template message to use if the definition is deprecated
+     *
+     * @return Definition the current instance
+     *
+     * @throws InvalidArgumentException When the message template is invalid.
+     *
+     * @api
+     */
+    public function setDeprecated($status = true, $template = null)
+    {
+        if (null !== $template) {
+            if (preg_match('#[\r\n]|\*/#', $template)) {
+                throw new InvalidArgumentException('Invalid characters found in deprecation template.');
+            }
+
+            if (false === strpos($template, '%service_id%')) {
+                throw new InvalidArgumentException('The deprecation template must contain the "%service_id%" placeholder.');
+            }
+
+            $this->deprecationTemplate = $template;
+        }
+
+        $this->deprecated = (bool) $status;
+
+        return $this;
+    }
+
+    /**
+     * Whether this definition is deprecated, that means it should not be called
+     * anymore.
+     *
+     * @return bool
+     *
+     * @api
+     */
+    public function isDeprecated()
+    {
+        return $this->deprecated;
+    }
+
+    /**
+     * Message to use if this definition is deprecated.
+     *
+     * @param string $id Service id relying on this definition
+     *
+     * @return string
+     *
+     * @api
+     */
+    public function getDeprecationMessage($id)
+    {
+        return str_replace('%service_id%', $id, $this->deprecationTemplate);
+    }
+
     /**
      * Sets a configurator to call after the service is fully initialized.
      *

src/Symfony/Component/DependencyInjection/DefinitionDecorator.php

@@ -180,6 +180,16 @@ public function setDecoratedService($id, $renamedId = null, $priority = 0)
         return parent::setDecoratedService($id, $renamedId, $priority);
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function setDeprecated($boolean = true, $template = null)
+    {
+        $this->changes['deprecated'] = true;
+
+        return parent::setDeprecated($boolean, $template);
+    }
+
     /**
      * Gets an argument to pass to the service constructor/factory method.
      *

src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php

@@ -592,7 +592,15 @@ private function addService($id, $definition)
             $return[] = sprintf("@throws InactiveScopeException when the '%s' service is requested while the '%s' scope is not active", $id, $scope);
         }
 
-        $return = implode("\n     * ", $return);
+        if ($definition->isDeprecated()) {
+            if ($return && 0 === strpos($return[count($return) - 1], '@return')) {
+                $return[] = '';
+            }
+
+            $return[] = sprintf('@deprecated %s', $definition->getDeprecationMessage($id));
+        }
+
+        $return = str_replace("\n     * \n", "\n     *\n", implode("\n     * ", $return));
 
         $doc = '';
         if ($definition->isShared() && ContainerInterface::SCOPE_PROTOTYPE !== $scope) {
@@ -652,6 +660,10 @@ private function addService($id, $definition)
         if ($definition->isSynthetic()) {
             $code .= sprintf("        throw new RuntimeException('You have requested a synthetic service (\"%s\"). The DIC does not know how to construct this service.');\n    }\n", $id);
         } else {
+            if ($definition->isDeprecated()) {
+                $code .= sprintf("        @trigger_error(%s, E_USER_DEPRECATED);\n\n", var_export($definition->getDeprecationMessage($id), true));
+            }
+
             $code .=
                 $this->addServiceInclude($id, $definition).
                 $this->addServiceLocalTempVariables($id, $definition).

src/Symfony/Component/DependencyInjection/Dumper/XmlDumper.php

@@ -201,6 +201,13 @@ private function addService($definition, $id, \DOMElement $parent)
             $service->appendChild($factory);
         }
 
+        if ($definition->isDeprecated()) {
+            $deprecated = $this->document->createElement('deprecated');
+            $deprecated->appendChild($this->document->createTextNode($definition->getDeprecationMessage('%service_id%')));
+
+            $service->appendChild($deprecated);
+        }
+
         if ($callable = $definition->getConfigurator()) {
             $configurator = $this->document->createElement('configurator');
 

src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php

@@ -104,6 +104,10 @@ private function addService($id, $definition)
             $code .= sprintf("        synchronized: true\n");
         }
 
+        if ($definition->isDeprecated()) {
+            $code .= sprintf("        deprecated: %s\n", $definition->getDeprecationMessage('%service_id%'));
+        }
+
         if ($definition->getFactoryClass(false)) {
             $code .= sprintf("        factory_class: %s\n", $definition->getFactoryClass(false));
         }

src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php

@@ -181,6 +181,10 @@ private function parseDefinition(\DOMElement $service, $file)
             $definition->setFile($files[0]->nodeValue);
         }
 
+        if ($deprecated = $this->getChildren($service, 'deprecated')) {
+            $definition->setDeprecated(true, $deprecated[0]->nodeValue);
+        }
+
         $definition->setArguments($this->getArgumentsAsPhp($service, 'argument'));
         $definition->setProperties($this->getArgumentsAsPhp($service, 'property'));
 

src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php

@@ -196,6 +196,10 @@ private function parseDefinition($id, $service, $file)
             $definition->setAbstract($service['abstract']);
         }
 
+        if (array_key_exists('deprecated', $service)) {
+            $definition->setDeprecated(true, $service['deprecated']);
+        }
+
         if (isset($service['factory'])) {
             if (is_string($service['factory'])) {
                 if (strpos($service['factory'], ':') !== false && strpos($service['factory'], '::') === false) {

src/Symfony/Component/DependencyInjection/Loader/schema/dic/services/services-1.0.xsd

@@ -81,6 +81,7 @@
       <xsd:element name="argument" type="argument" minOccurs="0" maxOccurs="unbounded" />
       <xsd:element name="configurator" type="callable" minOccurs="0" maxOccurs="1" />
       <xsd:element name="factory" type="callable" minOccurs="0" maxOccurs="1" />
+      <xsd:element name="deprecated" type="xsd:string" minOccurs="0" maxOccurs="1" />
       <xsd:element name="call" type="call" minOccurs="0" maxOccurs="unbounded" />
       <xsd:element name="tag" type="tag" minOccurs="0" maxOccurs="unbounded" />
       <xsd:element name="property" type="property" minOccurs="0" maxOccurs="unbounded" />

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

@@ -244,6 +244,36 @@ public function testSetDecoratedServiceOnServiceHasParent()
         $this->assertEquals(array('foo', 'foo_inner', 0), $container->getDefinition('child1')->getDecoratedService());
     }
 
+    public function testDecoratedServiceCopiesDeprecatedStatusFromParent()
+    {
+        $container = new ContainerBuilder();
+        $container->register('deprecated_parent')
+            ->setDeprecated(true)
+        ;
+
+        $container->setDefinition('decorated_deprecated_parent', new DefinitionDecorator('deprecated_parent'));
+
+        $this->process($container);
+
+        $this->assertTrue($container->getDefinition('decorated_deprecated_parent')->isDeprecated());
+    }
+
+    public function testDecoratedServiceCanOverwriteDeprecatedParentStatus()
+    {
+        $container = new ContainerBuilder();
+        $container->register('deprecated_parent')
+            ->setDeprecated(true)
+        ;
+
+        $container->setDefinition('decorated_deprecated_parent', new DefinitionDecorator('deprecated_parent'))
+            ->setDeprecated(false)
+        ;
+
+        $this->process($container);
+
+        $this->assertFalse($container->getDefinition('decorated_deprecated_parent')->isDeprecated());
+    }
+
     protected function process(ContainerBuilder $container)
     {
         $pass = new ResolveDefinitionTemplatesPass();

src/Symfony/Component/DependencyInjection/Tests/ContainerBuilderTest.php

@@ -63,6 +63,28 @@ public function testDefinitions()
         }
     }
 
+    public function testCreateDeprecatedService()
+    {
+        $definition = new Definition('stdClass');
+        $definition->setDeprecated(true);
+
+        $that = $this;
+        $wasTriggered = false;
+
+        set_error_handler(function ($errno, $errstr) use ($that, &$wasTriggered) {
+            $that->assertSame(E_USER_DEPRECATED, $errno);
+            $that->assertSame('The "deprecated_foo" service is deprecated. You should stop using it, as it will soon be removed.', $errstr);
+            $wasTriggered = true;
+        });
+
+        $builder = new ContainerBuilder();
+        $builder->createService($definition, 'deprecated_foo');
+
+        restore_error_handler();
+
+        $this->assertTrue($wasTriggered);
+    }
+
     /**
      * @covers Symfony\Component\DependencyInjection\ContainerBuilder::register
      */

src/Symfony/Component/DependencyInjection/Tests/DefinitionTest.php

@@ -233,6 +233,42 @@ public function testSetIsAbstract()
         $this->assertTrue($def->isAbstract(), '->isAbstract() returns true if the instance must not be public.');
     }
 
+    /**
+     * @covers Symfony\Component\DependencyInjection\Definition::setDeprecated
+     * @covers Symfony\Component\DependencyInjection\Definition::isDeprecated
+     * @covers Symfony\Component\DependencyInjection\Definition::hasCustomDeprecationTemplate
+     * @covers Symfony\Component\DependencyInjection\Definition::getDeprecationMessage
+     */
+    public function testSetIsDeprecated()
+    {
+        $def = new Definition('stdClass');
+        $this->assertFalse($def->isDeprecated(), '->isDeprecated() returns false by default');
+        $this->assertSame($def, $def->setDeprecated(true), '->setDeprecated() implements a fluent interface');
+        $this->assertTrue($def->isDeprecated(), '->isDeprecated() returns true if the instance should not be used anymore.');
+        $this->assertSame('The "deprecated_service" service is deprecated. You should stop using it, as it will soon be removed.', $def->getDeprecationMessage('deprecated_service'), '->getDeprecationMessage() should return a formatted message template');
+    }
+
+    /**
+     * @dataProvider invalidDeprecationMessageProvider
+     * @covers Symfony\Component\DependencyInjection\Definition::setDeprecated
+     * @expectedException Symfony\Component\DependencyInjection\Exception\InvalidArgumentException
+     */
+    public function testSetDeprecatedWithInvalidDeprecationTemplate($message)
+    {
+        $def = new Definition('stdClass');
+        $def->setDeprecated(false, $message);
+    }
+
+    public function invalidDeprecationMessageProvider()
+    {
+        return array(
+            "With \rs" => array("invalid \r message %service_id%"),
+            "With \ns" => array("invalid \n message %service_id%"),
+            'With */s' => array('invalid */ message %service_id%'),
+            'message not containing require %service_id% variable' => array('this is deprecated'),
+        );
+    }
+
     /**
      * @covers Symfony\Component\DependencyInjection\Definition::setConfigurator
      * @covers Symfony\Component\DependencyInjection\Definition::getConfigurator

src/Symfony/Component/DependencyInjection/Tests/Fixtures/containers/container9.php

@@ -89,6 +89,10 @@
     ->register('decorator_service_with_name', 'stdClass')
     ->setDecoratedService('decorated', 'decorated.pif-pouf')
 ;
+$container
+    ->register('deprecated_service', 'stdClass')
+    ->setDeprecated(true)
+;
 $container
     ->register('new_factory', 'FactoryClass')
     ->setProperty('foo', 'bar')

src/Symfony/Component/DependencyInjection/Tests/Fixtures/graphviz/services9.dot

@@ -17,6 +17,7 @@ digraph sc {
   node_decorated [label="decorated\nstdClass\n", shape=record, fillcolor="#eeeeee", style="filled"];
   node_decorator_service [label="decorator_service\nstdClass\n", shape=record, fillcolor="#eeeeee", style="filled"];
   node_decorator_service_with_name [label="decorator_service_with_name\nstdClass\n", shape=record, fillcolor="#eeeeee", style="filled"];
+  node_deprecated_service [label="deprecated_service\nstdClass\n", shape=record, fillcolor="#eeeeee", style="filled"];
   node_new_factory [label="new_factory\nFactoryClass\n", shape=record, fillcolor="#eeeeee", style="filled"];
   node_factory_service [label="factory_service\nBar\n", shape=record, fillcolor="#eeeeee", style="filled"];
   node_new_factory_service [label="new_factory_service\nFooBarBaz\n", shape=record, fillcolor="#eeeeee", style="filled"];

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9.php

@@ -33,6 +33,7 @@ public function __construct()
             'decorated' => 'getDecoratedService',
             'decorator_service' => 'getDecoratorServiceService',
             'decorator_service_with_name' => 'getDecoratorServiceWithNameService',
+            'deprecated_service' => 'getDeprecatedServiceService',
             'factory_service' => 'getFactoryServiceService',
             'foo' => 'getFooService',
             'foo.baz' => 'getFoo_BazService',
@@ -143,6 +144,23 @@ protected function getDecoratorServiceWithNameService()
         return $this->services['decorator_service_with_name'] = new \stdClass();
     }
 
+    /**
+     * Gets the 'deprecated_service' service.
+     *
+     * This service is shared.
+     * This method always returns the same instance of the service.
+     *
+     * @return \stdClass A stdClass instance.
+     *
+     * @deprecated The "deprecated_service" service is deprecated. You should stop using it, as it will soon be removed.
+     */
+    protected function getDeprecatedServiceService()
+    {
+        @trigger_error('The "deprecated_service" service is deprecated. You should stop using it, as it will soon be removed.', E_USER_DEPRECATED);
+
+        return $this->services['deprecated_service'] = new \stdClass();
+    }
+
     /**
      * Gets the 'factory_service' service.
      *

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php

@@ -37,6 +37,7 @@ public function __construct()
             'configured_service' => 'getConfiguredServiceService',
             'decorator_service' => 'getDecoratorServiceService',
             'decorator_service_with_name' => 'getDecoratorServiceWithNameService',
+            'deprecated_service' => 'getDeprecatedServiceService',
             'factory_service' => 'getFactoryServiceService',
             'foo' => 'getFooService',
             'foo.baz' => 'getFoo_BazService',
@@ -144,6 +145,23 @@ protected function getDecoratorServiceWithNameService()
         return $this->services['decorator_service_with_name'] = new \stdClass();
     }
 
+    /**
+     * Gets the 'deprecated_service' service.
+     *
+     * This service is shared.
+     * This method always returns the same instance of the service.
+     *
+     * @return \stdClass A stdClass instance.
+     *
+     * @deprecated The "deprecated_service" service is deprecated. You should stop using it, as it will soon be removed.
+     */
+    protected function getDeprecatedServiceService()
+    {
+        @trigger_error('The "deprecated_service" service is deprecated. You should stop using it, as it will soon be removed.', E_USER_DEPRECATED);
+
+        return $this->services['deprecated_service'] = new \stdClass();
+    }
+
     /**
      * Gets the 'factory_service' service.
      *