updates tpb dump scrapper

lib/cache.js

@@ -0,0 +1,32 @@
+const cacheManager = require('cache-manager');
+
+const GLOBAL_KEY_PREFIX = 'stremio-torrentio';
+const IMDB_ID_PREFIX = `${GLOBAL_KEY_PREFIX}|imdb_id`;
+const METADATA_PREFIX = `${GLOBAL_KEY_PREFIX}|metadata`;
+
+const GLOBAL_TTL = process.env.METADATA_TTL || 7 * 24 * 60 * 60; // 7 days
+
+
+const cache = initiateCache();
+
+function initiateCache() {
+  return cacheManager.caching({
+    store: 'memory',
+    ttl: GLOBAL_TTL
+  });
+}
+
+function cacheWrap(key, method, options) {
+  return cache.wrap(key, method, options);
+}
+
+function cacheWrapImdbId(key, method) {
+  return cacheWrap(`${IMDB_ID_PREFIX}:${key}`, method, { ttl: GLOBAL_TTL });
+}
+
+function cacheWrapMetadata(id, method) {
+  return cacheWrap(`${METADATA_PREFIX}:${id}`, method, { ttl: GLOBAL_TTL });
+}
+
+module.exports = { cacheWrapImdbId, cacheWrapMetadata };
+