Use a single MongoDB client

bin/genieacs-fs.ts

@@ -23,7 +23,6 @@ import * as cluster from "../lib/cluster";
 import * as server from "../lib/server";
 import { listener } from "../lib/fs";
 import * as db from "../lib/db";
-import * as cache from "../lib/cache";
 import { version as VERSION } from "../package.json";
 
 logger.init("fs", VERSION);
@@ -33,11 +32,9 @@ const SERVICE_PORT = config.get("FS_PORT") as number;
 
 function exitWorkerGracefully(): void {
   setTimeout(exitWorkerUngracefully, 5000).unref();
-  Promise.all([
-    db.disconnect(),
-    cache.disconnect(),
-    cluster.worker.disconnect(),
-  ]).catch(exitWorkerUngracefully);
+  Promise.all([db.disconnect(), cluster.worker.disconnect()]).catch(
+    exitWorkerUngracefully
+  );
 }
 
 function exitWorkerUngracefully(): void {
@@ -100,7 +97,8 @@ if (!cluster.worker) {
     listener(req, res);
   };
 
-  const initPromise = Promise.all([db.connect(), cache.connect()])
+  const initPromise = db
+    .connect()
     .then(() => {
       server.start(options, _listener);
     })