add torrentio catalogs addon

catalogs/lib/cache.js

@@ -0,0 +1,48 @@
+const cacheManager = require('cache-manager');
+const mangodbStore = require('cache-manager-mongodb');
+
+const CATALOG_TTL = process.env.STREAM_TTL || 12 * 60 * 60; // 12 hours
+
+const MONGO_URI = process.env.MONGODB_URI;
+
+const remoteCache = initiateRemoteCache();
+
+function initiateRemoteCache() {
+  if (MONGO_URI) {
+    return cacheManager.caching({
+      store: mangodbStore,
+      uri: MONGO_URI,
+      options: {
+        collection: 'torrentio_catalog_collection',
+        useNewUrlParser: true,
+        useUnifiedTopology: false,
+        ttl: CATALOG_TTL
+      },
+      ttl: CATALOG_TTL,
+      ignoreCacheErrors: true
+    });
+  } else {
+    return cacheManager.caching({
+      store: 'memory',
+      ttl: CATALOG_TTL
+    });
+  }
+}
+
+function cacheWrap(cache, key, method, options) {
+  if (!cache) {
+    return method();
+  }
+  return cache.wrap(key, method, options);
+}
+
+function cacheWrapCatalog(key, method) {
+  return cacheWrap(remoteCache, key, method, { ttl: CATALOG_TTL });
+}
+
+function cacheWrapIds(key, method) {
+  return cacheWrap(remoteCache, `ids|${key}`, method, { ttl: CATALOG_TTL });
+}
+
+module.exports = { cacheWrapCatalog, cacheWrapIds };
+