refactoring

Resolve #7779

packages/backend/src/misc/antenna-cache.ts

@@ -0,0 +1,36 @@
+import { Antennas } from '@/models/index';
+import { Antenna } from '@/models/entities/antenna';
+import { subsdcriber } from '../db/redis';
+
+let antennasFetched = false;
+let antennas: Antenna[] = [];
+
+export async function getAntennas() {
+	if (!antennasFetched) {
+		antennas = await Antennas.find();
+		antennasFetched = true;
+	}
+
+	return antennas;
+}
+
+subsdcriber.on('message', async (_, data) => {
+	const obj = JSON.parse(data);
+
+	if (obj.channel === 'internal') {
+		const { type, body } = obj.message;
+		switch (type) {
+			case 'antennaCreated':
+				antennas.push(body);
+				break;
+			case 'antennaUpdated':
+				antennas[antennas.findIndex(a => a.id === body.id)] = body;
+				break;
+			case 'antennaDeleted':
+				antennas = antennas.filter(a => a.id !== body.id);
+				break;
+			default:
+				break;
+		}
+	}
+});