fix(rustproxy): Use cooperative cancellation for background tasks, prune stale caches and metric entries, and switch tests to dynamic port allocation to avoid port conflicts

test/test.forwarding-regression.ts

@@ -1,9 +1,12 @@
 import { expect, tap } from '@git.zone/tstest/tapbundle';
 import * as net from 'net';
 import { SmartProxy } from '../ts/proxies/smart-proxy/smart-proxy.js';
+import { findFreePorts, assertPortsFree } from './helpers/port-allocator.js';
 
 // Test to verify port forwarding works correctly
 tap.test('forward connections should not be immediately closed', async (t) => {
+  const [PROXY_PORT, SERVER_PORT] = await findFreePorts(2);
+
   // Create a backend server that accepts connections
   const testServer = net.createServer((socket) => {
     console.log('Client connected to test server');
@@ -21,8 +24,8 @@ tap.test('forward connections should not be immediately closed', async (t) => {
 
   // Listen on a non-privileged port
   await new Promise<void>((resolve) => {
-    testServer.listen(47721, '127.0.0.1', () => {
-      console.log('Test server listening on port 47721');
+    testServer.listen(SERVER_PORT, '127.0.0.1', () => {
+      console.log(`Test server listening on port ${SERVER_PORT}`);
       resolve();
     });
   });
@@ -34,13 +37,13 @@ tap.test('forward connections should not be immediately closed', async (t) => {
       {
         name: 'forward-test',
         match: {
-          ports: 47720,
+          ports: PROXY_PORT,
         },
         action: {
           type: 'forward',
           targets: [{
             host: '127.0.0.1',
-            port: 47721,
+            port: SERVER_PORT,
           }],
         },
       },
@@ -51,7 +54,7 @@ tap.test('forward connections should not be immediately closed', async (t) => {
 
   // Create a client connection through the proxy
   const client = net.createConnection({
-    port: 47720,
+    port: PROXY_PORT,
     host: '127.0.0.1',
   });
 
@@ -105,6 +108,7 @@ tap.test('forward connections should not be immediately closed', async (t) => {
   client.end();
   await smartProxy.stop();
   testServer.close();
+  await assertPortsFree([PROXY_PORT, SERVER_PORT]);
 });
 
 export default tap.start();