Implement proxy chain connection accumulation fix and add comprehensive tests
- Updated socket handling to prevent connection accumulation in chained proxies. - Introduced centralized bidirectional forwarding for consistent socket management. - Enhanced cleanup logic to ensure immediate closure of sockets when one closes. - Added tests to verify connection behavior under various scenarios, including backend failures and rapid reconnections.
This commit is contained in:
195
test/test.proxy-chain-simple.node.ts
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195
test/test.proxy-chain-simple.node.ts
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import { tap, expect } from '@git.zone/tstest/tapbundle';
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import * as net from 'net';
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import * as plugins from '../ts/plugins.js';
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// Import SmartProxy and configurations
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import { SmartProxy } from '../ts/index.js';
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tap.test('simple proxy chain test - identify connection accumulation', async () => {
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console.log('\n=== Simple Proxy Chain Test ===');
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console.log('Setup: Client → SmartProxy1 (8590) → SmartProxy2 (8591) → Backend (down)');
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// Create backend server that accepts and immediately closes connections
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const backend = net.createServer((socket) => {
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console.log('Backend: Connection received, closing immediately');
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socket.destroy();
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});
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await new Promise<void>((resolve) => {
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backend.listen(9998, () => {
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console.log('✓ Backend server started on port 9998 (closes connections immediately)');
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resolve();
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});
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});
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// Create SmartProxy2 (downstream)
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const proxy2 = new SmartProxy({
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ports: [8591],
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enableDetailedLogging: true,
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socketTimeout: 5000,
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routes: [{
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name: 'to-backend',
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match: { ports: 8591 },
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action: {
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type: 'forward',
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target: {
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host: 'localhost',
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port: 9998 // Backend that closes immediately
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}
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}
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}]
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});
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// Create SmartProxy1 (upstream)
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const proxy1 = new SmartProxy({
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ports: [8590],
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enableDetailedLogging: true,
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socketTimeout: 5000,
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routes: [{
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name: 'to-proxy2',
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match: { ports: 8590 },
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action: {
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type: 'forward',
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target: {
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host: 'localhost',
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port: 8591 // Forward to proxy2
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}
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}
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}]
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});
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await proxy2.start();
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console.log('✓ SmartProxy2 started on port 8591');
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await proxy1.start();
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console.log('✓ SmartProxy1 started on port 8590');
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// Helper to get connection counts
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const getConnectionCounts = () => {
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const conn1 = (proxy1 as any).connectionManager;
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const conn2 = (proxy2 as any).connectionManager;
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return {
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proxy1: conn1 ? conn1.getConnectionCount() : 0,
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proxy2: conn2 ? conn2.getConnectionCount() : 0
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};
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};
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console.log('\n--- Making 5 sequential connections ---');
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for (let i = 0; i < 5; i++) {
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console.log(`\n=== Connection ${i + 1} ===`);
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const counts = getConnectionCounts();
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console.log(`Before: Proxy1=${counts.proxy1}, Proxy2=${counts.proxy2}`);
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await new Promise<void>((resolve) => {
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const client = new net.Socket();
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let dataReceived = false;
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client.on('data', (data) => {
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console.log(`Client received data: ${data.toString()}`);
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dataReceived = true;
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});
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client.on('error', (err) => {
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console.log(`Client error: ${err.code}`);
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resolve();
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});
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client.on('close', () => {
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console.log(`Client closed (data received: ${dataReceived})`);
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resolve();
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});
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client.connect(8590, 'localhost', () => {
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console.log('Client connected to Proxy1');
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// Send HTTP request
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client.write('GET / HTTP/1.1\r\nHost: test.com\r\n\r\n');
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});
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// Timeout
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setTimeout(() => {
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if (!client.destroyed) {
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console.log('Client timeout, destroying');
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client.destroy();
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}
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resolve();
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}, 2000);
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});
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// Wait a bit and check counts
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await new Promise(resolve => setTimeout(resolve, 500));
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const afterCounts = getConnectionCounts();
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console.log(`After: Proxy1=${afterCounts.proxy1}, Proxy2=${afterCounts.proxy2}`);
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if (afterCounts.proxy1 > 0 || afterCounts.proxy2 > 0) {
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console.log('⚠️ WARNING: Connections not cleaned up!');
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}
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}
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console.log('\n--- Test with backend completely down ---');
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// Stop backend
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backend.close();
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await new Promise(resolve => setTimeout(resolve, 100));
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console.log('✓ Backend stopped');
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// Make more connections with backend down
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for (let i = 0; i < 3; i++) {
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console.log(`\n=== Connection ${i + 6} (backend down) ===`);
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const counts = getConnectionCounts();
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console.log(`Before: Proxy1=${counts.proxy1}, Proxy2=${counts.proxy2}`);
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await new Promise<void>((resolve) => {
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const client = new net.Socket();
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client.on('error', () => {
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resolve();
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});
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client.on('close', () => {
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resolve();
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});
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client.connect(8590, 'localhost', () => {
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client.write('GET / HTTP/1.1\r\nHost: test.com\r\n\r\n');
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});
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setTimeout(() => {
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if (!client.destroyed) {
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client.destroy();
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}
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resolve();
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}, 1000);
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});
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await new Promise(resolve => setTimeout(resolve, 500));
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const afterCounts = getConnectionCounts();
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console.log(`After: Proxy1=${afterCounts.proxy1}, Proxy2=${afterCounts.proxy2}`);
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}
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// Final check
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console.log('\n--- Final Check ---');
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await new Promise(resolve => setTimeout(resolve, 1000));
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const finalCounts = getConnectionCounts();
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console.log(`Final counts: Proxy1=${finalCounts.proxy1}, Proxy2=${finalCounts.proxy2}`);
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await proxy1.stop();
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await proxy2.stop();
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// Verify
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if (finalCounts.proxy1 > 0 || finalCounts.proxy2 > 0) {
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console.log('\n❌ FAIL: Connections accumulated!');
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} else {
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console.log('\n✅ PASS: No connection accumulation');
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}
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expect(finalCounts.proxy1).toEqual(0);
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expect(finalCounts.proxy2).toEqual(0);
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});
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tap.start();
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