The HttpKernelInterface is a lie

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the HttpKernelInterface is a lie

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@igorwesome

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“Interface” Protocol Communication Message passing

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Catherine Please, 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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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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No content

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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/fortune }

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#!/bin/bash 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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curl => inetd | web | cgi

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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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function helloWorld(array $env) { return [ 200, ["Content-Type" => "text/plain"], ["Hello world!"], ]; }

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sapi

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$_SERVER header echo exit

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HttpKernelInterface

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sapi kernel

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tcp websocket HTTP/1.1 {“JSON”}

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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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export SCRIPT_NAME=/app.php export SCRIPT_FILENAME=/var/www/app.php export PATH_INFO=/foo export QUERY_STRING="bar=baz&qux=quux" export REQUEST_URI=/foo export REQUEST_METHOD=GET php-cgi app.php

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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 (but could be optimized)

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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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class EmptyDecorator def initialize(app) @app = app end def call(env) @app.call(env) end end

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class CommonLogger def initialize(app, logger=nil) @app = app @logger = logger end def call(env) began_at = Time.now response = @app.call(env) status, header, _ = response log(env, status, header, began_at) response end private def log(env, status, header, began_at) ... end end

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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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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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App Logger Authentication Session

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No content

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CHH simensen igorw

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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 $app = new Stack\OAuth($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 $app = new CallableHttpKernel(function ($request) { $token = $request->attributes->get('oauth.token'); if (!$token) { return new RedirectResponse('/auth'); } $params = $token->getExtraParams(); return sprintf('Welcome @%s!', $params['screen_name']); });

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Composition!

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

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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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Choose wisely

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Michael Rowe, from The Noun Project

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• joind.in/8666 • stackphp.com • @stackphp • @igorwesome • github.com/igorw/CgiHttpKernel