feat(cache): external API cache (#786)

server/lib/cache.ts

@@ -0,0 +1,56 @@
+import NodeCache from 'node-cache';
+
+type AvailableCacheIds = 'tmdb' | 'radarr' | 'sonarr' | 'rt';
+
+interface Cache {
+  id: AvailableCacheIds;
+  data: NodeCache;
+}
+
+const DEFAULT_TTL = 300;
+const DEFAULT_CHECK_PERIOD = 120;
+
+class CacheManager {
+  private availableCaches: Record<AvailableCacheIds, Cache> = {
+    tmdb: {
+      id: 'tmdb',
+      data: new NodeCache({
+        stdTTL: DEFAULT_TTL,
+        checkperiod: DEFAULT_CHECK_PERIOD,
+      }),
+    },
+    radarr: {
+      id: 'radarr',
+      data: new NodeCache({
+        stdTTL: DEFAULT_TTL,
+        checkperiod: DEFAULT_CHECK_PERIOD,
+      }),
+    },
+    sonarr: {
+      id: 'sonarr',
+      data: new NodeCache({
+        stdTTL: DEFAULT_TTL,
+        checkperiod: DEFAULT_CHECK_PERIOD,
+      }),
+    },
+    rt: {
+      id: 'rt',
+      data: new NodeCache({
+        stdTTL: 21600, // 12 hours TTL
+        checkperiod: 60 * 30, // 30 minutes check period
+      }),
+    },
+  };
+
+  public getCache(id: AvailableCacheIds): Cache {
+    return this.availableCaches[id];
+  }
+
+  public getAllCaches(): Record<string, Cache> {
+    return this.availableCaches;
+  }
+}
+
+const cacheManager = new CacheManager();
+
+export default cacheManager;