Rename files

app/dns-fallback.node.ts

@@ -0,0 +1,37 @@
+// Copyright 2024 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { join } from 'node:path';
+import { readFile } from 'node:fs/promises';
+import { DNSFallbackSchema } from '../ts/types/DNSFallback.std.js';
+import type { DNSFallbackType } from '../ts/types/DNSFallback.std.js';
+import { parseUnknown } from '../ts/util/schemas.std.js';
+import { createLogger } from '../ts/logging/log.std.js';
+
+const log = createLogger('dns-fallback');
+
+let cached: DNSFallbackType | undefined;
+
+export async function getDNSFallback(): Promise<DNSFallbackType> {
+  if (cached != null) {
+    return cached;
+  }
+
+  const configPath = join(__dirname, '..', 'build', 'dns-fallback.json');
+  let str: string;
+  try {
+    str = await readFile(configPath, 'utf8');
+  } catch (error) {
+    log.error(
+      'Warning: build/dns-fallback.json not build, run `npm run build:dns-fallback`'
+    );
+    cached = [];
+    return cached;
+  }
+
+  const json: unknown = JSON.parse(str);
+
+  const result = parseUnknown(DNSFallbackSchema, json);
+  cached = result;
+  return result;
+}