[WIP] Remove discovery dependency

.gitignore

@@ -5,3 +5,4 @@ composer.lock
 phpspec.yml
 phpunit.xml
 puli.json
+puli.phar

.travis.yml

@@ -34,6 +34,7 @@ before_install:
     - travis_retry composer self-update
 
 install:
+    - wget https://github.com/puli/cli/releases/download/1.0.0-beta10/puli.phar && chmod +x puli.phar
     - composer require symfony/symfony:${SYMFONY_VERSION} --no-update
     - travis_retry composer update ${COMPOSER_FLAGS} --prefer-source --no-interaction
 

DependencyInjection/Compiler/DiscoveryPass.php

@@ -0,0 +1,85 @@
+<?php
+
+namespace Http\HttplugBundle\DependencyInjection\Compiler;
+
+use Http\Client\HttpClient;
+use Http\HttplugBundle\HttplugFactory;
+use Http\Message\MessageFactory;
+use Http\Message\StreamFactory;
+use Http\Message\UriFactory;
+use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Exception\RuntimeException;
+use Symfony\Component\DependencyInjection\Reference;
+
+/**
+ * Adds fallback and discovery services.
+ *
+ * @author Márk Sági-Kazár <mark.sagikazar@gmail.com>
+ */
+final class DiscoveryPass implements CompilerPassInterface
+{
+    /**
+     * Fallback services and classes.
+     *
+     * @var array
+     */
+    private $services = [
+        'client' => HttpClient::class,
+        'message_factory' => MessageFactory::class,
+        'uri_factory' => UriFactory::class,
+        'stream_factory' => StreamFactory::class,
+    ];
+
+    /**
+     * {@inheritdoc}
+     */
+    public function process(ContainerBuilder $container)
+    {
+        $useDiscovery = false;
+
+        foreach ($this->services as $service => $class) {
+            $serviceId = sprintf('httplug.%s.default', $service);
+
+            if (false === $container->has($serviceId)) {
+                // Register and create factory for the first time
+                if (false === $useDiscovery) {
+                    $this->registerFactory($container);
+
+                    $factory = [
+                        new Reference('httplug.factory'),
+                        'find',
+                    ];
+
+                    $useDiscovery = true;
+                }
+
+                $definition = $container->register($serviceId, $class);
+
+                $definition->setFactory($factory);
+                $definition->addArgument($class);
+            }
+        }
+    }
+
+    /**
+     * @param ContainerBuilder $container
+     *
+     * @throws RuntimeException
+     */
+    private function registerFactory(ContainerBuilder $container)
+    {
+        if (false === $container->has('puli.discovery')) {
+            throw new RuntimeException(
+                'You need to install puli/symfony-bundle or add configuration at httplug.classes in order to use this bundle. Refer to http://docs.php-http/en/latest/integrations/index.html'
+            );
+        }
+
+        $definition = $container->register('httplug.factory', HttplugFactory::class);
+
+        $definition
+            ->addArgument(new Reference('puli.discovery'))
+            ->setPublic(false)
+        ;
+    }
+}

DependencyInjection/HttplugExtension.php

@@ -33,7 +33,6 @@ public function load(array $configs, ContainerBuilder $container)
 
         $loader->load('services.xml');
         $loader->load('plugins.xml');
-        $loader->load('discovery.xml');
 
         $enabled = is_bool($config['toolbar']['enabled']) ? $config['toolbar']['enabled'] : $container->hasParameter('kernel.debug') && $container->getParameter('kernel.debug');
         if ($enabled) {
@@ -48,14 +47,14 @@ public function load(array $configs, ContainerBuilder $container)
 
         foreach ($config['classes'] as $service => $class) {
             if (!empty($class)) {
-                $container->removeDefinition(sprintf('httplug.%s.default', $service));
                 $container->register(sprintf('httplug.%s.default', $service), $class);
             }
         }
 
         foreach ($config['main_alias'] as $type => $id) {
             $container->setAlias(sprintf('httplug.%s', $type), $id);
         }
+
         $this->configurePlugins($container, $config['plugins']);
         $this->configureClients($container, $config);
     }
@@ -174,7 +173,6 @@ private function configurePluginByName($name, Definition $definition, array $con
 
     /**
      * @param ContainerBuilder $container
-     * @param Definition       $parent
      * @param array            $config
      */
     private function configureAuthentication(ContainerBuilder $container, array $config)

HttplugBundle.php

@@ -2,6 +2,8 @@
 
 namespace Http\HttplugBundle;
 
+use Http\HttplugBundle\DependencyInjection\Compiler\DiscoveryPass;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpKernel\Bundle\Bundle;
 
 /**
@@ -10,4 +12,10 @@
  */
 class HttplugBundle extends Bundle
 {
+    public function build(ContainerBuilder $container)
+    {
+        parent::build($container);
+
+        $container->addCompilerPass(new DiscoveryPass());
+    }
 }

HttplugFactory.php

@@ -0,0 +1,107 @@
+<?php
+
+namespace Http\HttplugBundle;
+
+use Puli\Discovery\Api\Discovery;
+use Puli\Discovery\Binding\ClassBinding;
+use Webmozart\Expression\Expr;
+
+/**
+ * This class is a wrapper around Puli discovery.
+ *
+ * @author Márk Sági-Kazár <mark.sagikazar@gmail.com>
+ */
+final class HttplugFactory
+{
+    /**
+     * @var Discovery
+     */
+    private $discovery;
+
+    /**
+     * @param Discovery $discovery
+     */
+    public function __construct(Discovery $discovery)
+    {
+        $this->discovery = $discovery;
+    }
+
+    /**
+     * Creates a class of type.
+     *
+     * @param string $type
+     *
+     * @return object
+     */
+    public function find($type)
+    {
+        $class = $this->findOneByType($type);
+
+        // TODO: use doctrine instantiator?
+        return new $class();
+    }
+
+    /**
+     * Finds a class of type and resolves optional dependency conditions.
+     *
+     * @param string $type
+     *
+     * @return string
+     *
+     * @throws \RuntimeException if no class is found.
+     */
+    private function findOneByType($type)
+    {
+        /** @var ClassBinding[] $bindings */
+        $bindings = $this->discovery->findBindings(
+            $type,
+            Expr::isInstanceOf('Puli\Discovery\Binding\ClassBinding')
+        );
+
+        foreach ($bindings as $binding) {
+            if ($binding->hasParameterValue('depends')) {
+                $dependency = $binding->getParameterValue('depends');
+
+                if (false === $this->evaluateCondition($dependency)) {
+                    continue;
+                }
+            }
+
+            return $binding->getClassName();
+        }
+
+        throw new \RuntimeException(sprintf('Class binding of type "%s" is not found', $type));
+    }
+
+    /**
+     * Evaulates conditions to boolean.
+     *
+     * @param mixed $condition
+     *
+     * @return bool
+     *
+     * TODO: review this method
+     */
+    protected function evaluateCondition($condition)
+    {
+        if (is_string($condition)) {
+            // Should be extended for functions, extensions???
+            return class_exists($condition);
+        } elseif (is_callable($condition)) {
+            return $condition();
+        } elseif (is_bool($condition)) {
+            return $condition;
+        } elseif (is_array($condition)) {
+            $evaluatedCondition = true;
+
+            // Immediately stop execution if the condition is false
+            for ($i = 0; $i < count($condition) && false !== $evaluatedCondition; ++$i) {
+                $evaluatedCondition &= $this->evaluateCondition($condition[$i]);
+            }
+
+            return $evaluatedCondition;
+        }
+
+        return false;
+    }
+}

Tests/Resources/app/AppKernel.php

@@ -10,10 +10,16 @@ class AppKernel extends Kernel
      */
     public function registerBundles()
     {
-        return [
+        $bundles =  [
             new \Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
             new \Http\HttplugBundle\HttplugBundle(),
         ];
+
+        if (false === defined('HHVM_VERSION')) {
+            $bundles[] = new \Puli\SymfonyBundle\PuliBundle();
+        }
+
+        return $bundles;
     }
 
     /**

Tests/Unit/DependencyInjection/Compiler/DiscoveryPassTest.php

@@ -0,0 +1,76 @@
+<?php
+
+namespace Http\HttplugBundle\Tests\Unit\DependencyInjection\Compiler;
+
+use Http\Client\HttpClient;
+use Http\HttplugBundle\DependencyInjection\Compiler\DiscoveryPass;
+use Http\HttplugBundle\HttplugFactory;
+use Http\Message\MessageFactory;
+use Http\Message\StreamFactory;
+use Http\Message\UriFactory;
+use Matthias\SymfonyDependencyInjectionTest\PhpUnit\AbstractCompilerPassTestCase;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+
+/**
+ * @author Márk Sági-Kazár <mark.sagikazar@gmail.com>
+ */
+final class DiscoveryPassTest extends AbstractCompilerPassTestCase
+{
+    protected function registerCompilerPass(ContainerBuilder $container)
+    {
+        $container->addCompilerPass(new DiscoveryPass());
+    }
+
+    public function testDiscoveryFallbacks()
+    {
+        $this->setDefinition('puli.discovery', new Definition('Puli\Discovery\Api\Discovery'));
+
+        $this->compile();
+
+        $this->assertContainerBuilderHasService('httplug.factory', HttplugFactory::class);
+
+        $this->assertContainerBuilderHasService('httplug.client.default', HttpClient::class);
+        $this->assertContainerBuilderHasService('httplug.message_factory.default', MessageFactory::class);
+        $this->assertContainerBuilderHasService('httplug.uri_factory.default', UriFactory::class);
+        $this->assertContainerBuilderHasService('httplug.stream_factory.default', StreamFactory::class);
+    }
+
+    public function testDiscoveryPartialFallbacks()
+    {
+        $this->setDefinition('puli.discovery', new Definition('Puli\Discovery\Api\Discovery'));
+        $this->setDefinition('httplug.client.default', new Definition('Http\Adapter\Guzzle6\Client'));
+
+        $this->compile();
+
+        $this->assertContainerBuilderHasService('httplug.factory', HttplugFactory::class);
+
+        $this->assertContainerBuilderHasService('httplug.client.default', 'Http\Adapter\Guzzle6\Client');
+        $this->assertContainerBuilderHasService('httplug.message_factory.default', MessageFactory::class);
+        $this->assertContainerBuilderHasService('httplug.uri_factory.default', UriFactory::class);
+        $this->assertContainerBuilderHasService('httplug.stream_factory.default', StreamFactory::class);
+    }
+
+    public function testNoDiscoveryFallbacks()
+    {
+        $this->setDefinition('httplug.client.default', new Definition(HttpClient::class));
+        $this->setDefinition('httplug.message_factory.default', new Definition(MessageFactory::class));
+        $this->setDefinition('httplug.uri_factory.default', new Definition(UriFactory::class));
+        $this->setDefinition('httplug.stream_factory.default', new Definition(StreamFactory::class));
+
+        $this->compile();
+
+        $this->assertContainerBuilderNotHasService('httplug.factory');
+    }
+
+    /**
+     * Overridden test as we have dependencies in this compiler pass.
+     *
+     * @test
+     * @expectedException \RuntimeException
+     */
+    public function compilation_should_not_fail_with_empty_container()
+    {
+        $this->compile();
+    }
+}