refactor(dns): move to core package (#4687)

packages/core/src/infrastructure/dns/env.ts

@@ -0,0 +1,8 @@
+import { createBooleanSchema, createEnv } from "../env";
+
+export const dnsEnv = createEnv({
+  server: {
+    ENABLE_DNS_CACHING: createBooleanSchema(false),
+  },
+  experimental__runtimeEnv: process.env,
+});

packages/core/src/infrastructure/dns/init.ts

@@ -0,0 +1,28 @@
+import { DnsCacheManager } from "dns-caching";
+
+import { createLogger } from "@homarr/core/infrastructure/logs";
+
+import { dnsEnv } from "./env";
+
+// Add global type augmentation for homarr
+declare global {
+  var homarr: {
+    dnsCacheManager?: DnsCacheManager;
+    // add other properties if needed
+  };
+}
+
+const logger = createLogger({ module: "dns" });
+
+// Initialize global.homarr if not present
+// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+global.homarr ??= {};
+global.homarr.dnsCacheManager ??= new DnsCacheManager({
+  cacheMaxEntries: 1000,
+  forceMinTtl: 5 * 60 * 1000, // 5 minutes
+  logger,
+});
+
+if (dnsEnv.ENABLE_DNS_CACHING) {
+  global.homarr.dnsCacheManager.initialize();
+}