Hi All

I am looking at setting up Varnish with Nginx for Silverstripe. Everything is working well, but I need a way to invalidate pages in the cache when they are updated in the cms. Is there a way I can trigger a local command or a url load when a page is published?

Cheers
Sam

You can use an onAfterWrite() hook on your Page class.

Thanks Simon

Will give it a go.

Thanks Simon

That worked great!

public function onAfterWrite() {
system('varnishadm -T :6082 "ban.url /"');
return true;
}

Clears the entire cache. Is it possible to replace the / with the current page? So it only clears it for that url? I tried:

public function onAfterWrite() {
system('varnishadm -T :6082 "ban.url $this->URLSegment"');
return true;
}

But that passed through ->URLSegment to the command line rather than the segment.

Thanks
Sam

Try:

$cmd = escapeshellarg('ban.url ' . $this->Link());
system('varnishadm -T :6082 ' . $cmd);

escapeshellarg() adds the quotes around the string so you don't need to.

Bloody legend, thanks Simon!

One last question. This works, but for it to work properly under all circumstances I will need to flush the parents as well, so changes to page titles and the like will filter upwards to the parents.

If $this->Link gives you the whole url. Is there one that will just give you the top level parent? I.e. get /staff/ instead of /staff/fred/

You'd want to call ->Link() on the topmost page, which you can get with something like:

if($this->ParentID) {
$top = $this->getAncestors()->Last();
} else {
$top = $this;
}