silverstripe-staticpublisher/code/tasks/RebuildStaticCacheTask.php

<?php
/**
 * @package staticpublisher
 */ 
class RebuildStaticCacheTask extends BuildTask {

	public function run($request) {
		Config::inst()->update('StaticPublisher', 'echo_progress', true);
		
		$page = singleton('Page');

		if(!$page->hasMethod('allPagesToCache')) {
			user_error(
				'RebuildStaticCacheTask::index(): Please define a method "allPagesToCache()" on your Page class to return all pages affected by a cache refresh.', 
				E_USER_ERROR
			);
		}
		
		
		if(!empty($_GET['urls'])) {
			$urls = $_GET['urls'];
		} else {
			$urls = $page->allPagesToCache();
		}
		
		$this->rebuildCache($urls, true);
	}
	
	/**
	 * Rebuilds the static cache for the pages passed through via $urls
	 *
	 * @param array $urls The URLs of pages to re-fetch and cache.
	 * @param bool $removeAll Remove all stale cache files (default TRUE).
	 */
	public function rebuildCache($urls, $removeAll = true) {

		if(!is_array($urls)) {
			// $urls must be an array	
			user_error("Rebuild cache must be passed an array of urls. Make sure your allPagesToCache function returns an array", E_USER_ERROR);
			return;
		}; 
		
		if(!Director::is_cli()) echo "<pre>\n";

		echo "Rebuilding cache.\nNOTE: Please ensure that this page ends with 'Done!' - if not, then something may have gone wrong.\n\n";

		$page = singleton('Page');
		$cacheBaseDir = $page->getDestDir();
		
		if(!file_exists($cacheBaseDir)) {
			Filesystem::makeFolder($cacheBaseDir);
		}
		
		if (file_exists($cacheBaseDir.'/lock') && !isset($_REQUEST['force'])) {
			die("There already appears to be a publishing queue running. You can skip warning this by adding ?/&force to the URL.");
		}
		
		touch($cacheBaseDir.'/lock');
		
		// Note: Similiar to StaticPublisher->republish()
		foreach($urls as $i => $url) {
			if($url && !is_string($url)) {
				user_error("Bad URL: " . var_export($url, true), E_USER_WARNING);
				continue;
			}
			
			$urls[$i] = $url;
		}

		$urls = array_unique($urls);
		sort($urls);
		
		$start = isset($_GET['start']) ? $_GET['start'] : 0;
		$count = isset($_GET['count']) ? $_GET['count'] : sizeof($urls);

		if(($start + $count) > sizeof($urls)) {
			$count = sizeof($urls) - $start;
		}

		$urls = array_slice($urls, $start, $count);

		$mappedUrls = $page->urlsToPaths($urls);

		if($removeAll && !isset($_GET['urls']) && $start == 0 && file_exists("../cache")) {
			echo "Removing stale cache files... \n";
			flush();

			if (Config::inst()->get('FilesystemPublisher', 'domain_based_caching')) {
				// Glob each dir, then glob each one of those
				foreach(glob(BASE_PATH . '/cache/*', GLOB_ONLYDIR) as $cacheDir) {
					foreach(glob($cacheDir.'/*') as $cacheFile) {
						$searchCacheFile = trim(str_replace($cacheBaseDir, '', $cacheFile), '\/');
						
						if (!in_array($searchCacheFile, $mappedUrls)) {
							echo " * Deleting $cacheFile\n";
							@unlink($cacheFile);
						}
					}
				}
			}

			echo "done.\n\n";
		}

		echo  "Rebuilding cache from " . sizeof($mappedUrls) . " urls...\n\n";
		
		$page->extend('publishPages', $mappedUrls);
		
		if (file_exists($cacheBaseDir.'/lock')) {
			unlink($cacheBaseDir.'/lock');
		}
		
		echo "\n\n== Done! ==\n";
	}
}