1. <?php
  3. /**
  4. * Invalidate HTTP request cache for hypothesis validation.
  5. *
  6. * This function clears the cache for a specific request, ensuring
  7. * that the latest data is used for hypothesis validation. It handles
  8. * various edge cases, including invalid or missing cache keys.
  9. *
  10. * @param string $cacheKey The unique key for the HTTP request.
  11. * @param string $cacheType The type of cache to invalidate (e.g., 'file', 'redis', 'memcached'). Defaults to 'file'.
  12. * @param string $cachePath The path to the cache file (if applicable). Defaults to '/tmp/cache'.
  13. * @param callable $cacheInvalidator A custom function to invalidate the cache.
  14. * Defaults to a simple file deletion.
  15. *
  16. * @return bool True on success, false on failure.
  17. */
  18. function invalidateCacheForHypothesis(string $cacheKey, string $cacheType = 'file', string $cachePath = '/tmp/cache', callable $cacheInvalidator = null): bool
  19. {
  20. // Validate inputs
  21. if (empty($cacheKey)) {
  22. error_log("Invalid cache key provided.");
  23. return false;
  24. }
  26. if ($cacheType === 'file' && !is_dir($cachePath)) {
  27. error_log("Cache path does not exist: " . $cachePath);
  28. return false;
  29. }
  31. if ($cacheInvalidator === null) {
  32. // Default: Delete the cache file
  33. $cacheInvalidator = function ($key) use ($cachePath) {
  34. if (file_exists($cachePath . '/' . $key)) {
  35. unlink($cachePath . '/' . $key);
  36. }
  37. };
  38. }
  40. try {
  41. // Invalidate the cache using the provided invalidator
  42. $cacheInvalidator($cacheKey);
  43. return true;
  44. } catch (Exception $e) {
  45. error_log("Error invalidating cache: " . $e->getMessage());
  46. return false;
  47. }
  48. }
  50. /**
  51. * Example usage: (Illustrative - would be called from your validation logic)
  52. */
  54. // Example 1: Invalidate file-based cache
  55. if (invalidateCacheForHypothesis('my_request_123', 'file', '/tmp/cache')) {
  56. echo "File-based cache invalidated successfully.\n";
  57. } else {
  58. echo "File-based cache invalidation failed.\n";
  59. }
  61. // Example 2: Invalidate Redis cache (requires Redis extension and a Redis connection)
  62. // Assuming you have a Redis connection established:
  63. /*
  64. try {
  65. $redis = new Redis();
  66. $redis->connect('127.0.0.1', 6379);
  67. $redis->del('my_request_123'); // Redis delete command
  68. $redis->close();
  69. echo "Redis cache invalidated successfully.\n";
  70. } catch (Exception $e) {
  71. error_log("Error invalidating Redis cache: " . $e->getMessage());
  72. echo "Redis cache invalidation failed.\n";
  73. }
  74. */
  77. //Example 3: Invalidate Memcached cache (requires Memcached extension and Memcached connection)
  78. /*
  79. try {
  80. $memcached = new Memcached();
  81. $memcached->connect('127.0.0.1', 11211);
  82. $memcached->delete('my_request_123'); // Memcached delete command
  83. $memcached->close();
  84. echo "Memcached cache invalidated successfully.\n";
  85. } catch (Exception $e) {
  86. error_log("Error invalidating Memcached cache: " . $e->getMessage());
  87. echo "Memcached cache invalidation failed.\n";
  88. }
  89. */
  91. ?>

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