sanket3280/code-execution

1/**2 * Problems Cache Utility3 * Caches fullProblems.json in memory to avoid blocking file reads4 */5 6const fs = require('fs').promises;7const path = require('path');8const logger = require('./logger');9 10let problemsCache = null;11let cacheTimestamp = null;12const CACHE_TTL = 5 * 60 * 1000; // 5 minutes13 14/**15 * Load problems from file (async)16 */17async function loadProblemsFromFile() {18  try {19    const filePath = path.join(__dirname, '../../scripts/fullProblems.json');20    const data = await fs.readFile(filePath, 'utf8');21    return JSON.parse(data);22  } catch (error) {23    logger.error('Error loading problems from file', error);24    return [];25  }26}27 28/**29 * Get cached problems or load from file30 */31async function getCachedProblems() {32  const now = Date.now();33  34  // Return cache if valid35  if (problemsCache && cacheTimestamp && (now - cacheTimestamp < CACHE_TTL)) {36    return problemsCache;37  }38  39  // Load fresh data40  problemsCache = await loadProblemsFromFile();41  cacheTimestamp = now;42  43  return problemsCache;44}45 46/**47 * Initialize cache on startup (optional)48 */49async function initializeCache() {50  try {51    problemsCache = await loadProblemsFromFile();52    cacheTimestamp = Date.now();53    logger.info(`Problems cache initialized with ${problemsCache.length} problems`);54  } catch (error) {55    logger.error('Failed to initialize problems cache', error);56  }57}58 59/**60 * Invalidate cache (call when problems are updated)61 */62function invalidateCache() {63  problemsCache = null;64  cacheTimestamp = null;65}66 67module.exports = {68  getCachedProblems,69  initializeCache,70  invalidateCache71};72