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