fembooru/ext/varnish/main.php

<?php
/*
* Name: Varnish Purger
* Author: Shish <webmaster@shishnet.org>
* License: GPLv2
* Visibility: admin
* Description: Sends PURGE requests when a /post/view is updated
*/

class VarnishPurger extends Extension {
	private function curl_purge($path) {
		// waiting for curl timeout adds ~5 minutes to unit tests
		if(defined("UNITTEST")) return;

		$url = make_http(make_link($path));
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PURGE");
		curl_setopt($ch, CURLOPT_TIMEOUT, 5);
		$result = curl_exec($ch);
		$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
		curl_close($ch);
		//return $result;
	}

	public function onCommentPosting(CommentPostingEvent $event) {
		$this->curl_purge("post/view/{$event->image_id}");
	}

	public function onImageInfoSet(ImageInfoSetEvent $event) {
		$this->curl_purge("post/view/{$event->image->id}");
	}

	public function onImageDeletion(ImageDeletionEvent $event) {
		$this->curl_purge("post/view/{$event->image->id}");
	}

	/**
	 * @return int
	 */
	public function get_priority(): int {return 99;}
}