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![Connect and purge
use
FOSHttpCacheProxyClientVarnish;
$servers
=
['10.0.0.1:6081'];
$proxyClient
=
new
Varnish($servers);
$proxyClient
-‐>purge('/news/articles/42')
-‐>purge('/news')
-‐>flush();](https://image.slidesharecdn.com/presentationdpc2014-140630052119-phpapp02/75/HTTP-Caching-and-PHP-14-2048.jpg)
![Tagging
//
overview.php
header('Cache-‐Control:
max-‐age=3600');
header('X-‐Cache-‐Tags:
art-‐1,art-‐2,art-‐3');
!
!
//
article.php
header('Cache-‐Control:
max-‐age=3600');
header('X-‐Cache-‐Tags:
art-‐2');
$invalidator-‐>invalidateTags(['art-‐2']);](https://image.slidesharecdn.com/presentationdpc2014-140630052119-phpapp02/75/HTTP-Caching-and-PHP-19-2048.jpg)
![Test-driven invalidation
class
MyTest
extends
VarnishTestCase
{
public
function
testTags()
{
$miss
=
$this-‐>getResponse('/article.php');
$hit
=
$this-‐>getResponse('/article.php');
$invalidator-‐>invalidateTags(['art-‐2']);
$this-‐>assertMiss($this-‐>getResponse('/article.php'));
}
}
OK
(1
test,
1
assertion)](https://image.slidesharecdn.com/presentationdpc2014-140630052119-phpapp02/75/HTTP-Caching-and-PHP-21-2048.jpg)
![Symfony bundle
fos_http_cache:
cache_control:
rules:
-‐
match:
host:
^login.example.com$
headers:
cache_control:
public:
false
s_maxage:
0
last_modified:
"-‐1
hour"
vary:
[Accept-‐Encoding,
Accept-‐Language]
-‐
match:
attributes:
{
_controller:
^AcmeBundle:Default:.*
}
additional_cacheable_status:
[400]
headers:
cache_control:
{
public:
true,
max_age:
15,
s_maxage:
30
}](https://image.slidesharecdn.com/presentationdpc2014-140630052119-phpapp02/75/HTTP-Caching-and-PHP-23-2048.jpg)
Uploaded byDavid de Boer
HTTP Caching and PHP
David de Boer gave a presentation on caching and invalidation with PHP and HTTP. He explained that caching can reduce response times and server load. The key challenges are cache invalidation and efficient caching through maximizing hits and infinite TTLs. He demonstrated using Varnish and Nginx caches with FOSHttpCache for purging, invalidating by regex, tags, and routes. Tests were also shown to validate invalidation. The FOSHttpCacheBundle integrates this with Symfony through annotations.
More Related Content
HTTP Caching and PHP
- 1. HTTP caching andPHP David de Boer
- 2. Hello DPC! • I’mDavid • Lead developer at Driebit, Amsterdam • Open source enthusiast
- 3. – Phil Karlton “Thereare only two hard things in Computer Science: cache invalidation and naming things.”
- 4. Why we cache •Reduce response times • Reduce server load • Cheap
- 5.
- 6.
- 7. Efficient caching • Maximizecache hits • TTL ∞
- 8. GET /apple HTTP/1.1 Host: fresh-‐fruit.com Connection: close ... ! ! HTTP/1.1 200 OK Host: fresh-‐fruit.com X-‐Cache: HIT Age: 567648000 ...
- 9. • Maximize cachehits • TTL ∞ • Invalidation Efficient caching
- 10.
- 11.
- 12. Varnish # /etc/varnish/default.vcl sub vcl_hit { if (req.request == "PURGE") { purge; error 204 "Purged"; } } ! sub vcl_miss { if (req.request == "PURGE") { purge; error 204 "Purged (Not in cache)"; } }
- 13. $ composer require friendsofsymfony/http-‐cache @alpha FOSHttpCache App
- 14. Connect and purge use FOSHttpCacheProxyClientVarnish; $servers = ['10.0.0.1:6081']; $proxyClient = new Varnish($servers); $proxyClient -‐>purge('/news/articles/42') -‐>purge('/news') -‐>flush();
- 15. Level up sub vcl_recv { if (req.request == "BAN") { ban("obj.http.x-‐host ~ " + req.http.x-‐host + " && obj.http.x-‐url ~ " + req.http.x-‐url + " && obj.http.content-‐type ~ " + req.http.x-‐content-‐type ); ! error 200 "Banned"; } } ! sub vcl_fetch { # Set ban lurker-‐friendly custom headers set beresp.http.x-‐url = req.url; set beresp.http.x-‐host = req.http.host; }
- 16. Level up use FOSHttpCacheCacheInvalidator; ! $invalidator = new CacheInvalidator( $proxyClient ); ! $invalidator -‐>invalidateRegex('.*', 'image/png') -‐>invalidateRegex('^/admin') -‐>flush();
- 17. Get organized • Complexrelationships between URLs • Knowing when to invalidate what • Depends on application logic
- 18. Tagging sub vcl_recv { if (req.request == "BAN") { if (req.http.x-‐cache-‐tags) { ban("obj.http.x-‐host ~ " + req.http.x-‐host + " && obj.http.x-‐url ~ " + req.http.x-‐url + " && obj.http.content-‐type ~ " + req.http.x-‐content-‐type + " && obj.http.x-‐cache-‐tags ~ " + req.http.x-‐cache-‐tags ); error 200 "Banned"; } else { # ... } } } ! # ...
- 19. Tagging // overview.php header('Cache-‐Control: max-‐age=3600'); header('X-‐Cache-‐Tags: art-‐1,art-‐2,art-‐3'); ! ! // article.php header('Cache-‐Control: max-‐age=3600'); header('X-‐Cache-‐Tags: art-‐2'); $invalidator-‐>invalidateTags(['art-‐2']);
- 20. use FOSHttpCacheTestsVarnishTestCase; ! class MyTest extends VarnishTestCase { public function testHit() { $first = $this-‐>getResponse('/cached.php'); $this-‐>assertMiss($first); $second = $this-‐>getResponse('/cached.php'); $this-‐>assertHit($second); } } OK (1 test, 2 assertions) Test-driven invalidation
- 21. Test-driven invalidation class MyTest extends VarnishTestCase { public function testTags() { $miss = $this-‐>getResponse('/article.php'); $hit = $this-‐>getResponse('/article.php'); $invalidator-‐>invalidateTags(['art-‐2']); $this-‐>assertMiss($this-‐>getResponse('/article.php')); } } OK (1 test, 1 assertion)
- 22. Symfony bundle $ composer require friendsofsymfony/http-‐cache-‐bundle @alpha ! /** * @InvalidateRoute("fruits-‐overview", params={"type" = "latest"}) * @InvalidateRoute("fruits", params={"num" = "id"}) */ public function editAction($id) { # ... /** * @Tag(expression="'fruit-‐'~$id") */ public function showAction($id) { # ...
- 23. Symfony bundle fos_http_cache: cache_control: rules: -‐ match: host: ^login.example.com$ headers: cache_control: public: false s_maxage: 0 last_modified: "-‐1 hour" vary: [Accept-‐Encoding, Accept-‐Language] -‐ match: attributes: { _controller: ^AcmeBundle:Default:.* } additional_cacheable_status: [400] headers: cache_control: { public: true, max_age: 15, s_maxage: 30 }
- 24.