feat: add sessions stats endpoint

apps/server/src/api-data/session/session.service.ts

@@ -1,8 +1,32 @@
-import { GetInfo } from 'ontime-types';
+import { GetInfo, SessionStats } from 'ontime-types';
 
 import { getDataProvider } from '../../classes/data-provider/DataProvider.js';
 import { publicFiles } from '../../setup/index.js';
 import { getNetworkInterfaces } from '../../utils/networkInterfaces.js';
+import { socket } from '../../adapters/WebsocketAdapter.js';
+import { getLastRequest } from '../../api-integration/integration.controller.js';
+import { getLastLoadedProject } from '../../services/app-state-service/AppStateService.js';
+import { runtimeService } from '../../services/runtime-service/RuntimeService.js';
+
+const startedAt = new Date();
+
+/** Gathers information related to runtime */
+export async function getSessionStats(): Promise<SessionStats> {
+  const { connectedClients, lastConnection } = socket.getStats();
+  const lastRequest = getLastRequest();
+  const projectName = await getLastLoadedProject();
+  const { playback } = runtimeService.getRuntimeState();
+
+  return {
+    startedAt: startedAt.toISOString(),
+    connectedClients,
+    lastConnection: lastConnection !== null ? lastConnection.toISOString() : null,
+    lastRequest: lastRequest !== null ? lastRequest.toISOString() : null,
+    projectName,
+    playback,
+    timezone: startedAt.getTimezoneOffset(),
+  };
+}
 
 /**
  * Adds business logic to gathering data for the info endpoint