Reverse proxy caching with Symfony

Transcript

1. Reverse Proxy Caching with Symfony
3. Agenda Revisit traditional caching strategies See how Symfony is different
4. There are several caching strategies
5. Output cache
6. $cache = Zend_Cache::factory(
 'Output',
 'Apc', [
 'lifetime' => 7200,
 'automatic_serialization' => true
 ]
 );
7. if (!($cache->start('mypage'))) { // output everything as usual echo 'Hello world! '; echo 'This is cached (' .time() . ') '; $cache->end(); // output buffering ends } echo 'This is never cached (' .time() . ').';
8. Function cache
9. $cache = Zend_Cache::factory(
 'Function',
 'Apc', [
 'lifetime' => 7200,
 'automatic_serialization' => true, 'cached_functions' => [ 'similar_text' ]
 ]
 );
10. $cache->call(
 'similar_text',
 [
 'a really long string ...',
 'another really long string ...'
 ]
 );
11. Class cache
12. $cache = Zend_Cache::factory(
 'Class',
 'Apc', [
 'lifetime' => 7200,
 'automatic_serialization' => true, 'cached_entity' => $anInstance
 ]
 );
13. $cache->anExpensiveMethodCall();
14. Full page cache
15. $cache = Zend_Cache::factory(
 'Page',
 'Apc', [
 'lifetime' => 7200,
 'automatic_serialization' => true, 'default_options' => [ 'cache_with_get_variables' => true, 'make_id_with_get_variables' => true ], 'regexps' => [ '^/index/' => ['cache' => true], '^/article/' => ['cache' => false], ] ] );
16. $cache->start();
17. But Symfony has a total different approach
18. Symfony relies on the simplicity and power of the HTTP cache as defined in the HTTP Specification
19. Combines the Expiration and Validation models
20. // web/app.php require_once __DIR__.'/../app/bootstrap.php.cache'; require_once __DIR__.'/../app/AppKernel.php'; require_once __DIR__.'/../app/AppCache.php'; use Symfony\Component\HttpFoundation\Request; $kernel = new AppKernel('prod', false); $kernel->loadClassCache();
 // wrap the default AppKernel with the AppCache one $kernel = new AppCache($kernel); $request = Request::createFromGlobals(); $response = $kernel->handle($request); $response->send(); $kernel->terminate($request, $response);
21. // app/AppCache.php use Symfony\Bundle\FrameworkBundle\HttpCache\HttpCache; class AppCache extends HttpCache { protected function getOptions() { return [ 'debug' => false, 'default_ttl' => 0, 'private_headers' => ['Authorization', 'Cookie'], 'allow_reload' => false, 'allow_revalidate' => false, 'stale_while_revalidate' => 2, 'stale_if_error' => 60, ]; } }
22. Symfony provides useful abstractions to make the life easier
23. Symfony\Component\HttpFoundation\Response
24. $response = Response::create('response content');
25. $response->setPublic();
 $response->setPrivate();
26. $date = new DateTime(); $date->modify('+600 seconds'); $response->setExpires($date);
27. $response->setMaxAge(600); $response->setSharedMaxAge(600);
28. $response->setLastModified($date);
 $response->setETag(computeETag());
 // Set response as public. Otherwise it will be private by default. $response->setPublic(); if ($response->isNotModified($request)) { return $response; }
29. use Sensio\Bundle\FrameworkExtraBundle\Configuration\Cache;
 
 /** * @Cache(expires="tomorrow", public=true) */ class BlogController extends Controller {
 // ... }
30. use Sensio\Bundle\FrameworkExtraBundle\Configuration\Cache;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
 
 /**
 * @Cache(expires="tomorrow", public=true) */ class BlogController extends Controller {
 
 /**
 * @Route("/posts/{id}")
 * @Cache(expires="+2 days")
 */
 public function showAction($id) {
 // ...
 } }
31. use Sensio\Bundle\FrameworkExtraBundle\Configuration\Cache;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
 
 /**
 * @Cache(expires="tomorrow", public=true) */ class BlogController extends Controller {
 
 /**
 * @Route("/posts/{id}")
 * @Cache(
 * lastModified="post.getUpdatedAt()",
 * ETag="'Post' ~ post.getId() ~ post.getUpdatedAt()"
 * )
 */
 public function showAction($id) {
 // ...
 } }
32. Combining Expiration and Validation
33. use Sensio\Bundle\FrameworkExtraBundle\Configuration\Cache;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
 
 /**
 * @Cache(expires="tomorrow", public=true) */ class BlogController extends Controller {
 
 /**
 * @Route("/posts/{id}")
 * @Cache(
 * lastModified="post.getUpdatedAt()",
 * ETag="'Post' ~ post.getId() ~ post.getUpdatedAt()",
 * expires="+15 days"
 * )
 */
 public function showAction($id) {
 // ...
 } }
34. Working with Reverse Proxy caches
35. use Sensio\Bundle\FrameworkExtraBundle\Configuration\Cache;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
 
 class BlogController extends Controller {
 
 /**
 * @Route("/posts/{id}")
 * @Cache(
 * lastModified="post.getUpdatedAt()",
 * ETag="'Post' ~ post.getId() ~ post.getUpdatedAt()",
 * smaxage=3600
 * )
 */
 public function showAction($id) {
 // ...
 } }
36. Symfony Reverse Proxy even supports ESI
37. <!-- Has a TTL of 7200 seconds --> <!DOCTYPE html> <html> <body> <!-- ... some content --> <!-- Embed the content of another page here —> <!-- Has a TTL of 500 seconds --> <esi:include src="http://..." /> <!-- ... more content --> </body> </html>
38. use Sensio\Bundle\FrameworkExtraBundle\Configuration\Cache;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
 
 class BlogController extends Controller {
 
 /**
 * @Route("/posts/{id}")
 * @Cache(smaxage=3600)
 */
 public function showAction($id) {
 // ...
 } }
39. {# AppBundle:Posts:show.html.twig #}
 {{ render_esi(controller('AppBundle:Comments:show', { 'id': post.id() })) }}
40. use Sensio\Bundle\FrameworkExtraBundle\Configuration\Cache;
 use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route; 
 class CommentsController extends Controller {
 /**
 * @Cache(smaxage=600) */ public function showAction($id) { // ... }
 }
41. Symfony is able to know if is talking with a Reverse Proxy
 Cache like Varnish
42. ¡Thanks! Questions?