udphole

helpers.js (6283B)

---

 const { spawn } = require('child_process');
 const net = require('net');
 const dgram = require('dgram');
 const path = require('path');
 
 const DAEMON_PATH = path.join(__dirname, '..', 'udphole');
 const TIMEOUT = 2000;
 
 function sleep(ms) {
   return new Promise(resolve => setTimeout(resolve, ms));
 }
 
 function findFreePort() {
   return new Promise((resolve, reject) => {
     const server = net.createServer();
     server.unref();
     server.on('error', reject);
     server.listen(0, () => {
       const addr = server.address();
       server.close(() => resolve(addr.port));
     });
   });
 }
 
 function spawnDaemon(configPath) {
   return new Promise(async (resolve, reject) => {
     await sleep(500);
     const daemon = spawn(DAEMON_PATH, ['-f', configPath, 'daemon', '-D'], {
       stdio: ['ignore', 'pipe', 'pipe', 'pipe']
     });
 
     let output = '';
     const startTimeout = setTimeout(() => {
       reject(new Error(`Daemon start timeout. Output: ${output}`));
     }, TIMEOUT);
 
     daemon.stderr.on('data', (data) => {
       process.stderr.write(data.toString());
       output += data.toString();
       if (output.includes('daemon started')) {
         clearTimeout(startTimeout);
         sleep(200).then(() => resolve(daemon));
       }
     });
 
     daemon.on('error', (err) => {
       clearTimeout(startTimeout);
       reject(err);
     });
   });
 }
 
 function killAllDaemons() {
   return new Promise((resolve) => {
     const { execSync } = require('child_process');
     try { execSync('pkill -9 udphole 2>/dev/null', { stdio: 'ignore' }); } catch(e) {}
     sleep(1000).then(resolve);
   });
 }
 
 function killDaemon(daemon) {
   return new Promise((resolve) => {
     if (!daemon || daemon.killed) {
       resolve();
       return;
     }
     daemon.once('exit', resolve);
     daemon.kill('SIGTERM');
     setTimeout(() => {
       if (!daemon.killed) daemon.kill('SIGKILL');
       resolve();
     }, 1000);
   });
 }
 
 function connectApi(port) {
   return new Promise((resolve, reject) => {
     const sock = net.createConnection({ port, host: '127.0.0.1', noDelay: true });
     sock.setEncoding('utf8');
     
     const timeout = setTimeout(() => {
       sock.destroy();
       reject(new Error('Connection timeout'));
     }, TIMEOUT);
     
     sock.on('connect', () => {
       clearTimeout(timeout);
       resolve(sock);
     });
     
     sock.on('error', reject);
   });
 }
 
 function connectUnixApi(socketPath) {
   return new Promise((resolve, reject) => {
     const sock = net.createConnection({ path: socketPath, noDelay: true });
     sock.setEncoding('utf8');
     
     const timeout = setTimeout(() => {
       sock.destroy();
       reject(new Error('Connection timeout'));
     }, TIMEOUT);
     
     sock.on('connect', () => {
       clearTimeout(timeout);
       resolve(sock);
     });
     
     sock.on('error', reject);
   });
 }
 
 function encodeResp(...args) {
   const n = args.length;
   let cmd = `*${n}\r\n`;
   for (const arg of args) {
     const s = String(arg);
     cmd += `$${s.length}\r\n${s}\r\n`;
   }
   return cmd;
 }
 
 function apiCommand(sock, ...args) {
   return new Promise((resolve, reject) => {
     const cmd = encodeResp(...args);
     
     let response = '';
     const timeout = setTimeout(() => {
       sock.destroy();
       reject(new Error('API command timeout'));
     }, TIMEOUT);
     
     sock.once('data', (data) => {
       response += data;
       clearTimeout(timeout);
       resolve(parseResp(response));
     });
     
     sock.write(cmd);
   });
 }
 
 function parseResp(data) {
   data = data.trim();
   if (data.startsWith('+')) return data.substring(1).trim();
   if (data.startsWith('-')) throw new Error(data.substring(1).trim());
   if (data.startsWith(':')) return parseInt(data.substring(1), 10);
   if (data.startsWith('*')) {
     const count = parseInt(data.substring(1), 10);
     if (count === 0) return [];
     const lines = data.split('\r\n');
     const result = [];
     let i = 1;
     for (let j = 0; j < count && i < lines.length; j++) {
       if (lines[i].startsWith('$')) {
         i++;
         if (i < lines.length) result.push(lines[i]);
       } else if (lines[i].startsWith(':')) {
         result.push(parseInt(lines[i].substring(1), 10));
       } else if (lines[i].startsWith('+')) {
         result.push(lines[i].substring(1));
       } else if (lines[i].startsWith('-')) {
         throw new Error(lines[i].substring(1));
       }
       i++;
     }
     return result;
   }
   if (data.startsWith('$')) {
     const len = parseInt(data.substring(1), 10);
     if (len === -1) return null;
     const idx = data.indexOf('\r\n');
     if (idx >= 0) return data.substring(idx + 2);
     return '';
   }
   return data;
 }
 
 function createUdpEchoServer() {
   return new Promise(async (resolve, reject) => {
     const server = dgram.createSocket('udp4');
     const messages = [];
     
     server.on('message', (msg, rinfo) => {
       messages.push({ data: msg.toString(), rinfo });
       server.send(msg, rinfo.port, rinfo.address);
     });
     
     server.on('error', reject);
     
     const port = await findFreePort();
     server.bind(port, '127.0.0.1', () => {
       resolve({
         port,
         socket: server,
         getMessages: () => messages,
         clearMessages: () => { messages.length = 0; }
       });
     });
   });
 }
 
 function sendUdp(port, host, message) {
   return new Promise((resolve, reject) => {
     const sock = dgram.createSocket('udp4');
     const buf = Buffer.from(message);
     sock.send(buf, 0, buf.length, port, host, (err) => {
       sock.close();
       if (err) reject(err);
       else resolve();
     });
   });
 }
 
 function recvUdp(port, timeout) {
   return new Promise((resolve, reject) => {
     const sock = dgram.createSocket('udp4');
     sock.bind(port, '127.0.0.1');
     
     const timer = setTimeout(() => {
       sock.close();
       reject(new Error('Receive timeout'));
     }, timeout || TIMEOUT);
     
     sock.on('message', (msg, rinfo) => {
       clearTimeout(timer);
       sock.close();
       resolve({ data: msg.toString(), rinfo });
     });
     
     sock.on('error', (err) => {
       clearTimeout(timer);
       reject(err);
     });
   });
 }
 
 module.exports = {
   sleep,
   findFreePort,
   spawnDaemon,
   killDaemon,
   killAllDaemons,
   connectApi,
   connectUnixApi,
   apiCommand,
   createUdpEchoServer,
   sendUdp,
   recvUdp,
   TIMEOUT
 };