impr(S3UTILS-181): Close all connections on server exit to prevent hang

service-level-sidecar/index.js

@@ -30,13 +30,23 @@ function setupSignalHandlers(cleanUpFunc) {
 startServer(server => {
     log.info(`server listening on ${env.host}:${env.port}`);
 
+    const sockets = new Set();
+    server.on('connection', socket => {
+        sockets.add(socket);
+        socket.once('close', () => sockets.delete(socket));
+    });
+
     if (env.tls.enabled) {
         log.info('tls enabled', { apiServer: true, vault: env.vaultTls, bucketd: env.bucketdTls });
     }
 
     const cleanup = jsutil.once(() => {
         log.info('server exiting');
-        server.close();
+        server.close(() => {
+            sockets.forEach(socket => socket.destroy());
+            log.info('server closed');
+            process.exit(0);
+        });
     });
 
     setupSignalHandlers(cleanup);