518 lines
17 KiB
PHP
518 lines
17 KiB
PHP
<?php
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/*
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* Copyright (C) 2025 Xibo Signage Ltd
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*
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* Xibo - Digital Signage - https://xibosignage.com
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*
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* This file is part of Xibo.
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*
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* Xibo is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* Xibo is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with Xibo. If not, see <http://www.gnu.org/licenses/>.
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*/
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namespace Xibo\Widget\Render;
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use Carbon\Carbon;
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use Illuminate\Support\Str;
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use Psr\Log\LoggerInterface;
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use Psr\Log\NullLogger;
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use Stash\Interfaces\PoolInterface;
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use Stash\Invalidation;
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use Stash\Item;
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use Xibo\Entity\Display;
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use Xibo\Helper\DateFormatHelper;
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use Xibo\Helper\LinkSigner;
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use Xibo\Helper\ObjectVars;
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use Xibo\Service\ConfigServiceInterface;
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use Xibo\Support\Exception\GeneralException;
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use Xibo\Widget\Provider\DataProvider;
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use Xibo\Widget\Provider\DataProviderInterface;
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use Xibo\Xmds\Wsdl;
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/**
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* Acts as a cache for the Widget data cache.
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*/
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class WidgetDataProviderCache
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{
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/** @var LoggerInterface */
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private $logger;
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/** @var \Stash\Interfaces\PoolInterface */
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private $pool;
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/** @var Item */
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private $lock;
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/** @var Item */
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private $cache;
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/** @var string The cache key */
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private $key;
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/** @var bool Is the cache a miss or old */
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private $isMissOrOld = true;
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private $cachedMediaIds;
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/**
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* @param \Stash\Interfaces\PoolInterface $pool
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*/
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public function __construct(PoolInterface $pool)
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{
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$this->pool = $pool;
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}
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/**
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* @param \Psr\Log\LoggerInterface $logger
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* @return $this
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*/
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public function useLogger(LoggerInterface $logger): WidgetDataProviderCache
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{
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$this->logger = $logger;
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return $this;
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}
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/**
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* @return \Psr\Log\LoggerInterface
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*/
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private function getLog(): LoggerInterface
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{
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if ($this->logger === null) {
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$this->logger = new NullLogger();
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}
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return $this->logger;
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}
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/**
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* Decorate this data provider with cache
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* @param DataProvider $dataProvider
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* @param string $cacheKey
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* @param Carbon|null $dataModifiedDt The date any associated data was modified.
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* @param bool $isLockIfMiss Should the cache be locked if it's a miss? Defaults to true.
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* @return bool
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* @throws \Xibo\Support\Exception\GeneralException
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*/
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public function decorateWithCache(
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DataProvider $dataProvider,
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string $cacheKey,
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?Carbon $dataModifiedDt,
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bool $isLockIfMiss = true,
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): bool {
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// Construct a key
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$this->key = '/widget/'
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. ($dataProvider->getDataType() ?: $dataProvider->getDataSource())
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. '/' . md5($cacheKey);
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$this->getLog()->debug('decorateWithCache: key is ' . $this->key);
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// Get the cache
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$this->cache = $this->pool->getItem($this->key);
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// Invalidation method old means that if this cache key is being regenerated concurrently to this request
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// we return the old data we have stored already.
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$this->cache->setInvalidationMethod(Invalidation::OLD);
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// Get the data (this might be OLD data)
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$data = $this->cache->get();
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$cacheCreationDt = $this->cache->getCreation();
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// Does the cache have data?
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// we keep data 50% longer than we need to, so that it has a chance to be regenerated out of band
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if ($data === null) {
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$this->getLog()->debug('decorateWithCache: miss, no data');
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$hasData = false;
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} else {
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$hasData = true;
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// Clear the data provider and add the cached items back to it.
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$dataProvider->clearData();
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$dataProvider->clearMeta();
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$dataProvider->addItems($data->data ?? []);
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// Record any cached mediaIds
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$this->cachedMediaIds = $data->media ?? [];
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// Update any meta
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foreach (($data->meta ?? []) as $key => $item) {
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$dataProvider->addOrUpdateMeta($key, $item);
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}
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// Determine whether this cache is a miss (i.e. expired and being regenerated, expired, out of date)
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// We use our own expireDt here because Stash will only return expired data with invalidation method OLD
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// if the data is currently being regenerated and another process has called lock() on it
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$expireDt = $dataProvider->getMeta()['expireDt'] ?? null;
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if ($expireDt !== null) {
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$expireDt = Carbon::createFromFormat('c', $expireDt);
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} else {
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$expireDt = $this->cache->getExpiration();
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}
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// Determine if the cache returned is a miss or older than the modified/expired dates
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$this->isMissOrOld = $this->cache->isMiss()
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|| ($dataModifiedDt !== null && $cacheCreationDt !== false && $dataModifiedDt->isAfter($cacheCreationDt)
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|| ($expireDt->isBefore(Carbon::now()))
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);
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$this->getLog()->debug('decorateWithCache: cache has data, is miss or old: '
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. var_export($this->isMissOrOld, true));
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}
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// If we do not have data/we're old/missed cache, and we have requested a lock, then we will be refreshing
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// the cache, so lock the record
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if ($isLockIfMiss && (!$hasData || $this->isMissOrOld)) {
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$this->concurrentRequestLock();
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}
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return $hasData;
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}
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/**
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* Is the cache a miss, or old data.
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* @return bool
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*/
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public function isCacheMissOrOld(): bool
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{
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return $this->isMissOrOld;
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}
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/**
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* Get the cache date for this data provider and key
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* @param DataProvider $dataProvider
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* @param string $cacheKey
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* @return Carbon|null
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*/
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public function getCacheDate(DataProvider $dataProvider, string $cacheKey): ?Carbon
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{
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// Construct a key
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$this->key = '/widget/'
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. ($dataProvider->getDataType() ?: $dataProvider->getDataSource())
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. '/' . md5($cacheKey);
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$this->getLog()->debug('getCacheDate: key is ' . $this->key);
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// Get the cache
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$this->cache = $this->pool->getItem($this->key);
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$cacheCreationDt = $this->cache->getCreation();
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return $cacheCreationDt ? Carbon::instance($cacheCreationDt) : null;
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}
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/**
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* @param DataProviderInterface $dataProvider
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* @throws \Xibo\Support\Exception\GeneralException
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*/
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public function saveToCache(DataProviderInterface $dataProvider): void
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{
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if ($this->cache === null) {
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throw new GeneralException('No cache to save');
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}
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// Set some cache dates so that we can track when this data provider was cached and when it should expire.
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$dataProvider->addOrUpdateMeta('cacheDt', Carbon::now()->format('c'));
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$dataProvider->addOrUpdateMeta(
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'expireDt',
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Carbon::now()->addSeconds($dataProvider->getCacheTtl())->format('c')
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);
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// Set our cache from the data provider.
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$object = new \stdClass();
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$object->data = $dataProvider->getData();
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$object->meta = $dataProvider->getMeta();
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$object->media = $dataProvider->getImageIds();
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$cached = $this->cache->set($object);
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if (!$cached) {
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throw new GeneralException('Cache failure');
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}
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// Keep the cache 50% longer than necessary
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// The expireDt must always be 15 minutes to allow plenty of time for the WidgetSyncTask to regenerate.
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$this->cache->expiresAfter(ceil(max($dataProvider->getCacheTtl() * 1.5, 900)));
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// Save to the pool
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$this->pool->save($this->cache);
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$this->getLog()->debug('saveToCache: cached ' . $this->key
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. ' for ' . $dataProvider->getCacheTtl() . ' seconds');
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}
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/**
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* Finalise the cache process
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*/
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public function finaliseCache(): void
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{
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$this->concurrentRequestRelease();
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}
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/**
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* Return any cached mediaIds
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* @return array
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*/
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public function getCachedMediaIds(): array
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{
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return $this->cachedMediaIds ?? [];
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}
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/**
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* Decorate for a preview
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* @param array $data The data
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* @param callable $urlFor
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* @return array
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*/
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public function decorateForPreview(array $data, callable $urlFor): array
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{
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foreach ($data as $row => $item) {
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// This is either an object or an array
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if (is_array($item)) {
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foreach ($item as $key => $value) {
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if (is_string($value)) {
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$data[$row][$key] = $this->decorateMediaForPreview($urlFor, $value);
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}
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}
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} else if (is_object($item)) {
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foreach (ObjectVars::getObjectVars($item) as $key => $value) {
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if (is_string($value)) {
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$item->{$key} = $this->decorateMediaForPreview($urlFor, $value);
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}
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}
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}
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}
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return $data;
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}
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/**
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* @param callable $urlFor
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* @param string|null $data
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* @return string|null
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*/
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private function decorateMediaForPreview(callable $urlFor, ?string $data): ?string
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{
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if ($data === null) {
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return null;
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}
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$matches = [];
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preg_match_all('/\[\[(.*?)\]\]/', $data, $matches);
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foreach ($matches[1] as $match) {
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if (Str::startsWith($match, 'mediaId')) {
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$value = explode('=', $match);
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$data = str_replace(
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'[[' . $match . ']]',
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$urlFor('library.download', ['id' => $value[1], 'type' => 'image']),
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$data
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);
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} else if (Str::startsWith($match, 'connector')) {
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$value = explode('=', $match);
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$data = str_replace(
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'[[' . $match . ']]',
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$urlFor('layout.preview.connector', [], ['token' => $value[1], 'isDebug' => 1]),
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$data
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);
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}
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}
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return $data;
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}
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/**
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* Decorate for a player
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* @param \Xibo\Service\ConfigServiceInterface $configService
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* @param \Xibo\Entity\Display $display
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* @param string $encryptionKey
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* @param array $data The data
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* @param array $storedAs A keyed array of module files this widget has access to
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* @return array
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* @throws \Xibo\Support\Exception\NotFoundException
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*/
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public function decorateForPlayer(
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ConfigServiceInterface $configService,
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Display $display,
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string $encryptionKey,
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array $data,
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array $storedAs,
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): array {
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$this->getLog()->debug('decorateForPlayer');
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$cdnUrl = $configService->getSetting('CDN_URL');
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foreach ($data as $row => $item) {
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// Each data item can be an array or an object
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if (is_array($item)) {
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foreach ($item as $key => $value) {
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if (is_string($value)) {
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$data[$row][$key] = $this->decorateMediaForPlayer(
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$cdnUrl,
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$display,
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$encryptionKey,
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$storedAs,
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$value,
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);
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}
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}
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} else if (is_object($item)) {
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foreach (ObjectVars::getObjectVars($item) as $key => $value) {
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if (is_string($value)) {
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$item->{$key} = $this->decorateMediaForPlayer(
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$cdnUrl,
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$display,
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$encryptionKey,
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$storedAs,
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$value
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);
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}
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}
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}
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}
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return $data;
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}
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/**
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* @param string|null $cdnUrl
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* @param \Xibo\Entity\Display $display
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* @param string $encryptionKey
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* @param array $storedAs
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* @param string|null $data
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* @return string|null
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* @throws \Xibo\Support\Exception\NotFoundException
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*/
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private function decorateMediaForPlayer(
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?string $cdnUrl,
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Display $display,
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string $encryptionKey,
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array $storedAs,
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?string $data,
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): ?string {
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if ($data === null) {
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return null;
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}
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// Do we need to add a URL prefix to the requests?
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$prefix = $display->isPwa() ? '/pwa/' : '';
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// Media substitutes
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$matches = [];
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preg_match_all('/\[\[(.*?)\]\]/', $data, $matches);
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foreach ($matches[1] as $match) {
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if (Str::startsWith($match, 'mediaId')) {
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$value = explode('=', $match);
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if (array_key_exists($value[1], $storedAs)) {
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if ($display->isPwa()) {
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$url = LinkSigner::generateSignedLink(
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$display,
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$encryptionKey,
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$cdnUrl,
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'M',
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$value[1],
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$storedAs[$value[1]],
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null,
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true,
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);
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} else {
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$url = $storedAs[$value[1]];
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}
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$data = str_replace('[[' . $match . ']]', $prefix . $url, $data);
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} else {
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$data = str_replace('[[' . $match . ']]', '', $data);
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}
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} else if (Str::startsWith($match, 'connector')) {
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// We have WSDL here because this is only called from XMDS.
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$value = explode('=', $match);
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$data = str_replace(
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'[[' . $match . ']]',
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Wsdl::getRoot() . '?connector=true&token=' . $value[1],
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$data
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);
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}
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}
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return $data;
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}
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// <editor-fold desc="Request locking">
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/**
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* Hold a lock on concurrent requests
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* blocks if the request is locked
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* @param int $ttl seconds
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* @param int $wait seconds
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* @param int $tries
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* @throws \Xibo\Support\Exception\GeneralException
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*/
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private function concurrentRequestLock(int $ttl = 300, int $wait = 2, int $tries = 5)
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{
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if ($this->cache === null) {
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throw new GeneralException('No cache to lock');
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}
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$this->lock = $this->pool->getItem('locks/concurrency/' . $this->cache->getKey());
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// Set the invalidation method to simply return the value (not that we use it, but it gets us a miss on expiry)
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// isMiss() returns false if the item is missing or expired, no exceptions.
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$this->lock->setInvalidationMethod(Invalidation::NONE);
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// Get the lock
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// other requests will wait here until we're done, or we've timed out
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$locked = $this->lock->get();
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// Did we get a lock?
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// if we're a miss, then we're not already locked
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if ($this->lock->isMiss() || $locked === false) {
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$this->getLog()->debug('Lock miss or false. Locking for ' . $ttl
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. ' seconds. $locked is '. var_export($locked, true)
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. ', key = ' . $this->cache->getKey());
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// so lock now
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$this->lock->set(true);
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$this->lock->expiresAfter($ttl);
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$this->lock->save();
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} else {
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// We are a hit - we must be locked
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$this->getLog()->debug('LOCK hit for ' . $this->cache->getKey() . ' expires '
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. $this->lock->getExpiration()->format(DateFormatHelper::getSystemFormat())
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. ', created ' . $this->lock->getCreation()->format(DateFormatHelper::getSystemFormat()));
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// Try again?
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$tries--;
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if ($tries <= 0) {
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// We've waited long enough
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throw new GeneralException('Concurrent record locked, time out.');
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} else {
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$this->getLog()->debug('Unable to get a lock, trying again. Remaining retries: ' . $tries);
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// Hang about waiting for the lock to be released.
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sleep($wait);
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// Recursive request (we've decremented the number of tries)
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$this->concurrentRequestLock($ttl, $wait, $tries);
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}
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}
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}
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/**
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* Release a lock on concurrent requests
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*/
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private function concurrentRequestRelease()
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{
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if ($this->lock !== null) {
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$this->getLog()->debug('Releasing lock ' . $this->lock->getKey());
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// Release lock
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$this->lock->set(false);
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$this->lock->expiresAfter(10); // Expire straight away (but give time to save)
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$this->pool->save($this->lock);
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}
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}
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// </editor-fold>
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}
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