Typescript migration:

* Refactoring of scheduler and jobs to use promises.
* Add "failed" state for tasks.

server/jobs/NodeInformationRetrievalJob.ts

@@ -0,0 +1,22 @@
+import Logger from "../logger";
+import MonitoringService from "../services/monitoringService";
+
+export default {
+    name: 'NodeInformationRetrievalJob',
+    description: 'Fetches the nodes.json and calculates and stores the monitoring / online status for registered nodes.',
+
+    run: (): Promise<void> => {
+        return new Promise<void>(
+            (resolve, reject) => {
+                MonitoringService.retrieveNodeInformation((err: any): void => {
+                    if (err) {
+                        Logger.tag('monitoring', 'information-retrieval').error('Error retrieving node data:', err);
+                        return reject(err);
+                    }
+
+                    resolve();
+                });
+            }
+        );
+    }
+};