Add caching layer and database helper
- Add CacheHelper for file-based caching with TTL support - Add Database helper for centralized connection management - Update WorkflowModel to cache status transitions (10 min TTL) - Update UserPreferencesModel to cache user prefs (5 min TTL) - Update manage_workflows.php to clear cache on changes - Update get_users.php to use Database helper (example migration) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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191
helpers/CacheHelper.php
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191
helpers/CacheHelper.php
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<?php
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/**
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* Simple File-Based Cache Helper
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*
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* Provides caching for frequently accessed data that doesn't change often,
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* such as workflow rules, user preferences, and configuration data.
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*/
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class CacheHelper {
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private static $cacheDir = null;
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private static $memoryCache = [];
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/**
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* Get the cache directory path
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*
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* @return string Cache directory path
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*/
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private static function getCacheDir() {
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if (self::$cacheDir === null) {
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self::$cacheDir = sys_get_temp_dir() . '/tinker_tickets_cache';
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if (!is_dir(self::$cacheDir)) {
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mkdir(self::$cacheDir, 0755, true);
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}
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}
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return self::$cacheDir;
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}
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/**
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* Generate a cache key from components
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*
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* @param string $prefix Cache prefix (e.g., 'workflow', 'user_prefs')
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* @param mixed $identifier Unique identifier
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* @return string Cache key
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*/
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private static function makeKey($prefix, $identifier = null) {
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$key = $prefix;
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if ($identifier !== null) {
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$key .= '_' . md5(serialize($identifier));
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}
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return preg_replace('/[^a-zA-Z0-9_]/', '_', $key);
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}
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/**
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* Get cached data
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*
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* @param string $prefix Cache prefix
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* @param mixed $identifier Unique identifier
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* @param int $ttl Time-to-live in seconds (default 300 = 5 minutes)
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* @return mixed|null Cached data or null if not found/expired
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*/
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public static function get($prefix, $identifier = null, $ttl = 300) {
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$key = self::makeKey($prefix, $identifier);
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// Check memory cache first (fastest)
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if (isset(self::$memoryCache[$key])) {
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$cached = self::$memoryCache[$key];
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if (time() - $cached['time'] < $ttl) {
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return $cached['data'];
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}
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unset(self::$memoryCache[$key]);
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}
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// Check file cache
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$filePath = self::getCacheDir() . '/' . $key . '.json';
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if (file_exists($filePath)) {
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$content = @file_get_contents($filePath);
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if ($content !== false) {
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$cached = json_decode($content, true);
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if ($cached && isset($cached['time']) && isset($cached['data'])) {
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if (time() - $cached['time'] < $ttl) {
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// Store in memory cache for faster subsequent access
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self::$memoryCache[$key] = $cached;
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return $cached['data'];
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}
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}
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}
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// Expired - delete file
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@unlink($filePath);
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}
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return null;
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}
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/**
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* Store data in cache
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*
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* @param string $prefix Cache prefix
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* @param mixed $identifier Unique identifier
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* @param mixed $data Data to cache
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* @return bool Success
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*/
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public static function set($prefix, $identifier, $data) {
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$key = self::makeKey($prefix, $identifier);
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$cached = [
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'time' => time(),
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'data' => $data
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];
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// Store in memory cache
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self::$memoryCache[$key] = $cached;
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// Store in file cache
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$filePath = self::getCacheDir() . '/' . $key . '.json';
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return @file_put_contents($filePath, json_encode($cached), LOCK_EX) !== false;
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}
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/**
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* Delete cached data
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*
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* @param string $prefix Cache prefix
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* @param mixed $identifier Unique identifier (null to delete all with prefix)
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* @return bool Success
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*/
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public static function delete($prefix, $identifier = null) {
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if ($identifier !== null) {
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$key = self::makeKey($prefix, $identifier);
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unset(self::$memoryCache[$key]);
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$filePath = self::getCacheDir() . '/' . $key . '.json';
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return !file_exists($filePath) || @unlink($filePath);
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}
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// Delete all files with this prefix
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$pattern = self::getCacheDir() . '/' . preg_replace('/[^a-zA-Z0-9_]/', '_', $prefix) . '*.json';
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$files = glob($pattern);
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foreach ($files as $file) {
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@unlink($file);
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}
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// Clear memory cache entries with this prefix
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foreach (array_keys(self::$memoryCache) as $key) {
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if (strpos($key, $prefix) === 0) {
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unset(self::$memoryCache[$key]);
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}
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}
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return true;
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}
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/**
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* Clear all cache
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*
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* @return bool Success
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*/
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public static function clearAll() {
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self::$memoryCache = [];
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$files = glob(self::getCacheDir() . '/*.json');
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foreach ($files as $file) {
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@unlink($file);
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}
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return true;
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}
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/**
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* Get data from cache or fetch it using a callback
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*
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* @param string $prefix Cache prefix
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* @param mixed $identifier Unique identifier
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* @param callable $callback Function to call if cache miss
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* @param int $ttl Time-to-live in seconds
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* @return mixed Cached or freshly fetched data
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*/
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public static function remember($prefix, $identifier, $callback, $ttl = 300) {
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$data = self::get($prefix, $identifier, $ttl);
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if ($data === null) {
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$data = $callback();
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if ($data !== null) {
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self::set($prefix, $identifier, $data);
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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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* Clean up expired cache files (call periodically)
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*
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* @param int $maxAge Maximum age in seconds (default 1 hour)
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*/
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public static function cleanup($maxAge = 3600) {
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$files = glob(self::getCacheDir() . '/*.json');
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$now = time();
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foreach ($files as $file) {
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if ($now - filemtime($file) > $maxAge) {
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@unlink($file);
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}
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}
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}
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}
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