Perf: offload Telegram CIDR fetching into separate thread

Build/lib/get-telegram-backup-ip.ts

@@ -7,6 +7,9 @@ import { bigint2ip } from 'fast-cidr-tools';
 
 import { base64ToUint8Array, concatUint8Arrays } from 'foxts/uint8array-utils';
 
+import Worktank from 'worktank';
+import { wait } from 'foxts/wait';
+
 const mtptoto_public_rsa = `-----BEGIN RSA PUBLIC KEY-----
 MIIBCgKCAQEAyr+18Rex2ohtVy8sroGP
 BwXD3DOoKCSpjDqYoXgCqB7ioln4eDCFfOBUlfXUEvM/fnKCpF46VkAftlb4VuPD
@@ -108,3 +111,153 @@ export function getTelegramBackupIPFromBase64(base64: string) {
     }
   }));
 }
+
+const pool = new Worktank({
+  pool: {
+    name: 'get-telegram-backup-ips',
+    size: 1 // The number of workers to keep in the pool, if more workers are needed they will be spawned up to this limit
+  },
+  worker: {
+    autoAbort: 10000,
+    autoTerminate: 30000, // The interval of milliseconds at which to check if the pool can be automatically terminated, to free up resources, workers will be spawned up again if needed
+    autoInstantiate: true,
+    methods: {
+      // eslint-disable-next-line object-shorthand -- workertank
+      getTelegramBackupIPs: async function (__filename: string): Promise<{ timestamp: number, ipcidr: string[], ipcidr6: string[] }> {
+        // TODO: createRequire is a temporary workaround for https://github.com/nodejs/node/issues/51956
+        const { default: module } = await import('node:module');
+        const __require = module.createRequire(__filename);
+
+        const picocolors = __require('picocolors') as typeof import('picocolors');
+        const { fetch } = __require('./fetch-retry') as typeof import('./fetch-retry');
+        const DNS2 = __require('dns2') as typeof import('dns2');
+        const { createReadlineInterfaceFromResponse } = __require('./fetch-text-by-line') as typeof import('./fetch-text-by-line');
+        const { getTelegramBackupIPFromBase64 } = __require('./get-telegram-backup-ip') as typeof import('./get-telegram-backup-ip');
+        const { fastIpVersion } = __require('foxts/fast-ip-version') as typeof import('foxts/fast-ip-version');
+
+        const resp = await fetch('https://core.telegram.org/resources/cidr.txt');
+        const lastModified = resp.headers.get('last-modified');
+        const date = lastModified ? new Date(lastModified) : new Date();
+
+        const ipcidr: string[] = [
+          // Unused secret Telegram backup CIDR, announced by AS62041
+          '95.161.64.0/20'
+        ];
+        const ipcidr6: string[] = [];
+
+        for await (const cidr of createReadlineInterfaceFromResponse(resp, true)) {
+          const v = fastIpVersion(cidr);
+          if (v === 4) {
+            ipcidr.push(cidr);
+          } else if (v === 6) {
+            ipcidr6.push(cidr);
+          }
+        }
+
+        const backupIPs = new Set<string>();
+
+        // https://github.com/tdlib/td/blob/master/td/telegram/ConfigManager.cpp
+
+        // Backup IP Source 1 (DoH)
+        await Promise.all([
+          DNS2.DOHClient({ dns: 'https://8.8.4.4/dns-query?dns={query}' }),
+          DNS2.DOHClient({ dns: 'https://1.0.0.1/dns-query?dns={query}' })
+        ].flatMap(
+          (client) => [
+            'apv3.stel.com', // prod
+            'tapv3.stel.com' // test
+          ].map(async (domain) => {
+            try {
+              // tapv3.stel.com was for testing server
+              const resp = await client(domain, 'TXT');
+              const strings = resp.answers.map(i => i.data);
+
+              const str = strings[0]!.length > strings[1]!.length
+                ? strings[0]! + strings[1]!
+                : strings[1]! + strings[0]!;
+
+              const ips = getTelegramBackupIPFromBase64(str);
+              ips.forEach(i => backupIPs.add(i.ip));
+
+              console.log('[telegram backup ip]', picocolors.green('DoH TXT'), { domain, ips });
+            } catch (e) {
+              console.error('[telegram backup ip]', picocolors.red('DoH TXT error'), { domain }, e);
+            }
+          })
+        ));
+
+        // Backup IP Source 2: Firebase Realtime Database (test server not supported)
+        try {
+          const text = await (await fetch('https://reserve-5a846.firebaseio.com/ipconfigv3.json')).json();
+          if (typeof text === 'string' && text.length === 344) {
+            const ips = getTelegramBackupIPFromBase64(text);
+            ips.forEach(i => backupIPs.add(i.ip));
+
+            console.log('[telegram backup ip]', picocolors.green('Firebase Realtime DB'), { ips });
+          }
+        } catch (e) {
+          console.error('[telegram backup ip]', picocolors.red('Firebase Realtime DB error'), e);
+          // ignore all errors
+        }
+
+        // Backup IP Source 3: Firebase Value Store (test server not supported)
+        try {
+          const json = await (await fetch('https://firestore.googleapis.com/v1/projects/reserve-5a846/databases/(default)/documents/ipconfig/v3', {
+            headers: {
+              Accept: '*/*',
+              Origin: undefined // Without this line, Google API will return "Bad request: Origin doesn't match Host for XD3.". Probably have something to do with sqlite cache store
+            }
+          })).json();
+
+          // const json = await resp.json();
+          if (
+            json && typeof json === 'object'
+            && 'fields' in json && typeof json.fields === 'object' && json.fields
+            && 'data' in json.fields && typeof json.fields.data === 'object' && json.fields.data
+            && 'stringValue' in json.fields.data && typeof json.fields.data.stringValue === 'string' && json.fields.data.stringValue.length === 344
+          ) {
+            const ips = getTelegramBackupIPFromBase64(json.fields.data.stringValue);
+            ips.forEach(i => backupIPs.add(i.ip));
+
+            console.log('[telegram backup ip]', picocolors.green('Firebase Value Store'), { ips });
+          } else {
+            console.error('[telegram backup ip]', picocolors.red('Firebase Value Store data format invalid'), { json });
+          }
+        } catch (e) {
+          console.error('[telegram backup ip]', picocolors.red('Firebase Value Store error'), e);
+        }
+
+        // Backup IP Source 4: Google App Engine
+        await Promise.all([
+          'https://dns-telegram.appspot.com',
+          'https://dns-telegram.appspot.com/test'
+        ].map(async (url) => {
+          try {
+            const text = await (await fetch(url)).text();
+            if (text.length === 344) {
+              const ips = getTelegramBackupIPFromBase64(text);
+              ips.forEach(i => backupIPs.add(i.ip));
+
+              console.log('[telegram backup ip]', picocolors.green('Google App Engine'), { url, ips });
+            }
+          } catch (e) {
+            console.error('[telegram backup ip]', picocolors.red('Google App Engine error'), { url }, e);
+          }
+        }));
+
+        // tcdnb.azureedge.net no longer works
+
+        console.log('[telegram backup ip]', `Found ${backupIPs.size} backup IPs:`, backupIPs);
+
+        ipcidr.push(...Array.from(backupIPs).map(i => i + '/32'));
+
+        return { timestamp: date.getTime(), ipcidr, ipcidr6 };
+      }
+    }
+  }
+});
+
+export const getTelegramCIDRPromise = wait(0).then(() => pool.exec(
+  'getTelegramBackupIPs',
+  [__filename]
+)).finally(() => pool.terminate());