Add PostHog analytics to desktop main process

surfsense_desktop/src/modules/analytics.ts

@@ -0,0 +1,46 @@
+import { PostHog } from 'posthog-node';
+import { machineIdSync } from 'node-machine-id';
+import { app } from 'electron';
+
+let client: PostHog | null = null;
+let distinctId = '';
+
+export function initAnalytics(): void {
+  const key = process.env.POSTHOG_KEY;
+  if (!key) return;
+
+  try {
+    distinctId = machineIdSync(true);
+  } catch {
+    return;
+  }
+
+  client = new PostHog(key, {
+    host: process.env.POSTHOG_HOST || 'https://us.i.posthog.com',
+    flushAt: 20,
+    flushInterval: 10000,
+  });
+}
+
+export function trackEvent(event: string, properties?: Record<string, unknown>): void {
+  if (!client) return;
+
+  client.capture({
+    distinctId,
+    event,
+    properties: {
+      platform: 'desktop',
+      app_version: app.getVersion(),
+      os: process.platform,
+      ...properties,
+    },
+  });
+}
+
+export async function shutdownAnalytics(): Promise<void> {
+  if (!client) return;
+
+  const timeout = new Promise<void>((resolve) => setTimeout(resolve, 3000));
+  await Promise.race([client.shutdown(), timeout]);
+  client = null;
+}