Add psr-15 example to examples folder

This example is broken and I don't know why (maybe somebody who knows what they are doing can explain?). But at least now we can _see_ that it is broken, which is better than just silently misleading people...

.github/workflows/continuous_integration.yml

@@ -95,7 +95,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        example: ['no-framework']
+        example: ['no-framework', 'psr-15']
       fail-fast: false
     steps:
       - name: "Checkout"

examples/psr-15/README.md

@@ -0,0 +1,11 @@
+PSR-15 Integration Example
+==========================
+
+```
+composer install
+php -S 127.0.0.1:8080
+```
+
+```
+curl -X POST -d '{"query":"{ hello(name: \"World\") }"}' -H "Content-Type: application/json" http://localhost:8080/graphql
+```

examples/psr-15/composer.json

@@ -0,0 +1,31 @@
+{
+  "autoload": {
+    "psr-4": {
+      "App\\": "src/"
+    }
+  },
+  "require": {
+    "thecodingmachine/graphqlite": "@dev",
+    "laminas/laminas-diactoros": "^2",
+    "laminas/laminas-stratigility": "^3",
+    "laminas/laminas-httphandlerrunner": "^2",
+    "mouf/picotainer": "^1.1",
+    "symfony/cache": "^4.2"
+  },
+  "repositories": [
+    {
+      "type": "path",
+      "url": "tmp-graphqlite",
+      "options": {
+          "symlink": true
+      }
+    }
+  ],
+  "scripts": {
+    "symlink-package": [
+      "rm -rf tmp-graphqlite && ln -s -f ../../ tmp-graphqlite"
+    ],
+    "pre-install-cmd": "@symlink-package",
+    "pre-update-cmd": "@symlink-package"
+  }
+}

examples/psr-15/config/container.php

@@ -0,0 +1,40 @@
+<?php
+
+use GraphQL\Type\Schema;
+use Mouf\Picotainer\Picotainer;
+use Psr\Container\ContainerInterface;
+use Psr\SimpleCache\CacheInterface;
+use Symfony\Component\Cache\Simple\FilesystemCache;
+use TheCodingMachine\GraphQLite\Http\Psr15GraphQLMiddlewareBuilder;
+use TheCodingMachine\GraphQLite\SchemaFactory;
+use Laminas\Stratigility\MiddlewarePipe;
+
+// Picotainer is a minimalist PSR-11 container.
+return new Picotainer([
+    MiddlewarePipe::class => function(ContainerInterface $container) {
+        $pipe = new MiddlewarePipe();
+        $pipe->pipe($container->get(WebonyxGraphqlMiddleware::class));
+        return $pipe;
+    },
+    // The WebonyxGraphqlMiddleware is a PSR-15 compatible
+    // middleware that exposes Webonyx schemas.
+    WebonyxGraphqlMiddleware::class => function(ContainerInterface $container) {
+        $builder = new Psr15GraphQLMiddlewareBuilder($container->get(Schema::class));
+        return $builder->createMiddleware();
+    },
+    CacheInterface::class => function() {
+        return new FilesystemCache();
+    },
+    Schema::class => function(ContainerInterface $container) {
+        // The magic happens here. We create a schema using GraphQLite SchemaFactory.
+        $factory = new SchemaFactory($container->get(CacheInterface::class), $container);
+        $factory->addControllerNamespace('App\\Controllers');
+        $factory->addTypeNamespace('App');
+        return $factory->createSchema();
+    },
+    // We declare the controller in the container.
+    MyController::class => function() {
+        return new MyController();
+    },
+]);
+

examples/psr-15/index.php

@@ -0,0 +1,30 @@
+<?php
+
+use Laminas\Diactoros\Response;
+use Laminas\Diactoros\ServerRequest;
+use Laminas\Diactoros\ServerRequestFactory;
+use Laminas\HttpHandlerRunner\Emitter\SapiStreamEmitter;
+use Laminas\Stratigility\Middleware\ErrorResponseGenerator;
+use Laminas\Stratigility\MiddlewarePipe;
+use Laminas\Diactoros\Server;
+use Laminas\HttpHandlerRunner\RequestHandlerRunner;
+
+require_once __DIR__ . '/vendor/autoload.php';
+
+$container = require 'config/container.php';
+
+$serverRequestFactory = [ServerRequestFactory::class, 'fromGlobals'];
+
+$errorResponseGenerator = function (Throwable $e) {
+    $generator = new ErrorResponseGenerator();
+    return $generator($e, new ServerRequest(), new Response());
+};
+
+$runner = new RequestHandlerRunner(
+    $container->get(MiddlewarePipe::class),
+    new SapiStreamEmitter(),
+    $serverRequestFactory,
+    $errorResponseGenerator
+);
+$runner->run();
+

examples/psr-15/src/Controllers/MyController.php

@@ -0,0 +1,13 @@
+<?php
+namespace App\Controllers;
+
+use TheCodingMachine\GraphQLite\Annotations\Query;
+
+class MyController
+{
+    #[Query]
+    public function hello(string $name): string
+    {
+        return 'Hello '.$name;
+    }
+}