Going crazy with Varnish and Symfony
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You know how HTTP caching works but need more? In this talk we look into ways to cache personalized content. We will look at Edge Side Includes (ESI) to tailor caching rules of fragments, and at the user context concept to differentiate caches not by individual user but by permission groups.
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Going crazy with Varnish and Symfony
- 1. Going crazy with Symfony and Varnish David de Boer15 May 2015
- 2. Varnish Public content Most requested Most processing Static assets Authenticated content? $ varnishtop -i BeReqUrl
- 4. Break up
- 5. only one TTL
- 6. don’t cache 15 mins 1 hour 24 hours
- 8. Enable ESI sub vcl_recv { set req.http.Surrogate-Capability = "abc=ESI/1.0"; } sub vcl_backend_response { if (beresp.http.Surrogate-Control ~ "ESI/1.0") { unset beresp.http.Surrogate-Control; set beresp.do_esi = true; } }
- 9. Plain PHP <?php header('Surrogate-Control: ESI/1.0'); ?> <html> <body> <esi:include src="/blue.php" /> Your main content. <esi:include src="/red.php" /> </body> </html> <?php // blue.php header('Cache-Control: no-cache'); ?> Blue is not cached. <?php // red.php header('Cache-Control: s-maxage=3600'); ?> Red is cached for an hour.
- 10. ESI in Symfony # app/config/config.yml framework: esi: enabled: true fragments: { path: /_fragment } {# template.twig #} {{ render_esi(controller('AppBundle:Red:list', {'max': 100})) }}
- 11. ESI performance <?php // blue.php sleep(2); header('Cache-Control: no-cache'); ?> Blue is kind of sleepy. <?php // red.php sleep(5); header('Cache-Control: no-cache'); ?> And red even more so. 7 seconds
- 13. Client-side Rich JavaScript apps JSON data through Ajax API design
- 14. ESI in JSON varnishd -p esi_syntax=0x00000003 { "id": 1, "name": "Martian Ambassador", "_embedded": { "category": <esi:include src="/categories/1"/> } }
- 15. Invalidation <?php use FOSHttpCacheProxyClientVarnish; use FOSHttpCacheCacheInvalidator; $varnishClient = new Varnish('127.0.0.1', 'http://mars-attacks.dev'); $cacheInvalidator = new CacheInvalidator($varnishClient); // If some data changes in your app: $cacheInvalidator->invalidatePath('/red.php')->flush();
- 16. Invalidation # app/config/config.yml fos_http_cache: proxy_client: varnish: servers: 127.0.0.1 base_url: mars-attacks.dev <?php use FOSHttpCacheBundleConfigurationInvalidateRoute; /** * @InvalidateRoute("red") */ public function editAction($id) { // This is where data changes }
- 18. Individual caching? // builtin.vcl sub vcl_recv { // ... if (req.http.Authorization || req.http.Cookie) { /* Not cacheable by default */ return (pass); } // ... }
- 19. Individual caching? sub vcl_recv { // ... if (req.http.Authorization || req.http.Cookie) { /* Cache all the personal things! */ return (hash); } // ... }
- 21. Individual caching? sub vcl_recv { // ... if (req.http.Authorization || req.http.Cookie) { /* Cache all the personal things! */ return (hash); } // ... } sub vcl_deliver { // ... set resp.http.Vary = "Cookie,Authorization"; }
- 22. Group together
- 23. User context Varnish hash lookup vary on credentials # content request vary on hash header # App ⟳
- 24. Varnish User context hash lookup vary on credentials # content request vary on hash header # ⟳
- 26. Configure user context sub vcl_recv { if (req.restarts == 0 && (req.http.cookie || req.http.authorization) && (req.method == "GET" || req.method == "HEAD") ) { if (req.http.accept) { set req.http.X-Fos-Original-Accept = req.http.accept; } set req.http.accept = "application/vnd.fos.user-context-hash"; set req.http.X-Fos-Original-Url = req.url; set req.url = "/_fos_user_context_hash"; return (hash); } if (req.restarts > 0 && req.http.accept == "application/vnd.fos.user-context-hash" ) { set req.url = req.http.X-Fos-Original-Url; unset req.http.X-Fos-Original-Url; if (req.http.X-Fos-Original-Accept) { set req.http.accept = req.http.X-Fos-Original-Accept; unset req.http.X-Fos-Original-Accept; } else { unset req.http.accept; } return (hash); } }
- 27. Configure user context sub vcl_backend_response { if (bereq.http.accept ~ "application/vnd.fos.user-context-hash" && beresp.status >= 500 ) { return (abandon); } } sub vcl_deliver { if (req.restarts == 0 && resp.http.content-type ~ "application/vnd.fos.user-context-hash" ) { set req.http.X-User-Context-Hash = resp.http.X-User-Context-Hash; return (restart); } set resp.http.Vary = regsub(resp.http.Vary, "(?i),? *X-User-Context-Hash *", ""); set resp.http.Vary = regsub(resp.http.Vary, "^, *", ""); if (resp.http.Vary == "") { unset resp.http.Vary; } unset resp.http.X-User-Context-Hash; }
- 28. Cleaning cookies $ varnishlog -c -i ReqHeader -I Cookie Cookie: __uvt=;PHPSESSID=ht8rl2tnbikpeoau7q5g677125;_ga=GA1.2.1332615739.14 31368832;uvts=320PnWhzN5bW7V2D sub vcl_recv { set req.http.cookie = ";" + req.http.cookie; set req.http.cookie = regsuball(req.http.cookie, "; +", ";"); set req.http.cookie = regsuball(req.http.cookie, ";(PHPSESSID)=", "; 1="); set req.http.cookie = regsuball(req.http.cookie, ";[^ ][^;]*", ""); set req.http.cookie = regsuball(req.http.cookie, "^[; ]+|[; ]+$", ""); } Cookie: PHPSESSID=ht8rl2tnbikpeoau7q5g677125
- 29. FOSHttpCacheBundle # app/config/config.yml fos_http_cache: user_context: hash_cache_ttl: 3600 hash_header: "Custom-User-Hash-Header" role_provider: true
- 30. Custom provider <?php use FOSHttpCacheUserContextContextProviderInterface; use FOSHttpCacheUserContextUserContext; class IsAwesomeProvider implements ContextProviderInterface { private $userService; public function __construct(YourUserService $userService) { $this->userService = $userService; } public function updateUserContext(UserContext $userContext) { $userContext->addParameter('awesome', $this->userService->isAwesome()); } } // <service id="app_bundle.provider" class="AppBundleProviderIsAwesomeProvider"> <tag name="fos_http_cache.user_context_provider" /> </service>