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the HttpKernelInterface is a lie

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@igorwhiletrue

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“Interface” Protocol Communication Message passing

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Simon Child, from The Noun Project

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Paulo Sá Ferreira - Purple Matter, from The Noun Project

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hi!

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10010101110100100

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1001010111010010000110101 Massimiliano Mauro, from The Noun Project

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Sergey Shmidt, from The Noun Project aloha!

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yay!

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00101000011101100102

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Universal Interface

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10010111001010001011

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1234 4321

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foo bar baz foo baz Patrick n Hawaii, from The Noun Project

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foo moo Anuar Zhumaev, from The Noun Project

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find src -name '*.php' | grep -iv tests | cut -f2- -d/ | cut -f1 -d\. | awk '{ print length, $0 }' | sort -n | tr / \\ ;

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Tim Boelaars, from The Noun Project

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nc

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/\_/\ / 0 0 \ ====v==== \ W / | | _ / ___ \ / / / \ \ | (((-----)))-' / ( ___ \__.=|___E /

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data Dmitry Baranovskiy, from The Noun Project

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xinetd

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/etc/xinet.d/ service { disable = no socket_type = stream protocol = tcp user = wait = no server = /usr/local/bin/ }

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/etc/xinet.d/fortune service fortune { disable = no socket_type = stream protocol = tcp user = xinetd wait = no server = /usr/local/bin/my- fortune.sh }

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#!/bin/bash # my-fortune.sh fortune | cowsay

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$ nc 7777

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$ nc 7777 ______________________________________ < Eat right, stay fit, and die anyway. > -------------------------------------- \ ^__^ \ (oo)\_______ (__)\ )\/\ ||----w | || ||

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/etc/xinet.d/cowsay service cowsay { disable = no socket_type = stream protocol = tcp user = xinetd wait = no server = /usr/games/cowsay }

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$ echo 'moo' | nc 7778

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$ echo 'moo' | nc 7778 _____ < moo > ----- \ ^__^ \ (oo)\_______ (__)\ )\/\ ||----w | || ||

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#!/usr/bin/php

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cgi

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The Common Gateway Interface (CGI) [22]! allows an HTTP [1], [4] server and a CGI! script to share responsibility for responding! to client requests. RFC 3875

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xinetd tcp http httpd

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http httpd script cgi

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script env vars data headers data

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GET / HTTP/1.1 Host: igor.io Accept: */* REQUEST_METHOD = GET PATH_INFO = / HTTP_HOST = igor.io HTTP_ACCEPT = */* SERVER_NAME = igor.io

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Content-Type: text/html ! ...

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fcgi

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script

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sockets are the new pipes

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• 1991: HTTP • 1993: CGI • 1995: PHP • 1996: FastCGI

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• 1997: Java Servlet • 2003: Python WSGI • 2007: Ruby Rack • 2009: Perl PSGI • 2011: Symfony2 HttpKernelInterface

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rack

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class HelloWorld def call(env) [ 200, {"Content-Type" => "text/plain"}, ["Hello world!"] ] end end

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sapi

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$_SERVER header echo exit

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HttpKernelInterface

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interface HttpKernelInterface! {! /*** @return Response */! public function handle(Request $request);! }

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sapi kernel

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“legacy” apps: it’s all great until exit;

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myths: !

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myths: caching

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myths: caching (use varnish)

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myths: caching (use varnish) functional tests

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CgiHttpKernel adapter from kernel to cgi functional test “legacy” apps

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kernel CGI

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kernel CGI anything!

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$kernel = new CgiHttpKernel(__DIR__.'/app'); ! $request = Request::create('/index.php'); $response = $kernel->handle($request); ! var_dump($response->getContent());

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use Symfony\Component\HttpKernel\Client; ! $client = new Client($kernel); ! $crawler = $client->request('GET', '/index.php');

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caution: it’s slow (WIP: FcgiHttpKernel)

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Where is the value?

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REQ REP

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fcgi roles

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authorizer httpd responder filter

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rack middlewares

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HttpKernel middlewares

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$app = new CallableHttpKernel(function ($request) { return new Response('Hello World!'); });

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class Logger implements HttpKernelInterface { private $app; private $logger; ! public function __construct(HttpKernelInterface $app, LoggerInterface $logger) { $this->app = $app; $this->logger = $logger; } ! public function handle(Request $request, ...) { $response = $this->app->handle($request, $type, $catch); ! $this->log($request, $response); ! return $response; } ! private function log(Request $request, Response $response) { ... } }

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$app = new Logger( $app, new Monolog\Logger() );

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use Symfony\Component\HttpKernel\HttpCache\HttpCache; use Symfony\Component\HttpKernel\HttpCache\Store; $app = new HttpCache( $app, new Store(__DIR__.'/cache') );

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use Symfony\Component\HttpKernel\HttpCache\HttpCache; use Symfony\Component\HttpKernel\HttpCache\Store; $app = new HttpCache( $app, new Store(__DIR__.'/cache') ); use varnish!

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do something before or after every request

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different take on event listeners

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class Foo implements HttpKernelInterface { private $app; ! public function __construct(HttpKernelInterface $app) { $this->app = $app; } ! public function handle(Request $request, ...) { $response = $this->app->handle($request, $type, $catch); ! return $response; } } 1 2 3

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UrlMap $blog = new Silex\Application(); ! $blog->get('/', function () { return 'This is the blog!'; }); ! $app = new Stack\UrlMap($app, [ '/blog' => $blog, ]);

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Session $app = new CallableHttpKernel(function ($request) { $session = $request->getSession(); ... }); ! $app = new Stack\Session($app);

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OAuth $app = new Igorw\Stack\OAuth($app, [ 'key' => 'foo', 'secret' => 'bar', 'callback_url' => 'http://localhost:8080/auth/verify', 'success_url' => '/', 'failure_url' => '/auth', ]); ! $app = new Stack\Session($app);

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OAuth $request->attributes->get('oauth.token');

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Composition!

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$stack = (new Stack\Builder()) ->push('Stack\Session') ->push('Igorw\Stack\OAuth', [...]) ->push('Foo'); ! $app = $stack->resolve($app);

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• GeoIp • IpRestrict • Backstage • Basic Authentication • Hawk • CORS Community

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It doesn’t stop there

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• Authentication • Debug toolbar • Injected routes • Signed cookies • Asset management • Force SSL • Error handling

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( )

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Choose wisely

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Michael Rowe, from The Noun Project

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• stackphp.com • @stackphp • @igorwhiletrue • github.com/igorw/CgiHttpKernel