grpc-js: Fix UDS channels not reconnecting after going idle

packages/grpc-js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@grpc/grpc-js",
-  "version": "1.10.7",
+  "version": "1.10.8",
   "description": "gRPC Library for Node - pure JS implementation",
   "homepage": "https://grpc.io/",
   "repository": "https://github.com/grpc/grpc-node/tree/master/packages/grpc-js",

packages/grpc-js/src/resolver-uds.ts

@@ -50,7 +50,7 @@ class UdsResolver implements Resolver {
   }
 
   destroy() {
-    // This resolver owns no resources, so we do nothing here.
+    this.hasReturnedResult = false;
   }
 
   static getDefaultAuthority(target: GrpcUri): string {

packages/grpc-js/test/common.ts

@@ -19,6 +19,8 @@ import * as loader from '@grpc/proto-loader';
 import * as assert2 from './assert2';
 import * as path from 'path';
 import * as grpc from '../src';
+import * as fsPromises from 'fs/promises';
+import * as os from 'os';
 
 import {
   GrpcObject,
@@ -71,54 +73,77 @@ const serviceImpl = {
 
 export class TestServer {
   private server: grpc.Server;
-  public port: number | null = null;
+  private target: string | null = null;
   constructor(public useTls: boolean, options?: grpc.ServerOptions) {
     this.server = new grpc.Server(options);
     this.server.addService(echoService.service, serviceImpl);
   }
-  start(): Promise<void> {
-    let credentials: grpc.ServerCredentials;
+
+  private getCredentials(): grpc.ServerCredentials {
     if (this.useTls) {
-      credentials = grpc.ServerCredentials.createSsl(null, [
+      return grpc.ServerCredentials.createSsl(null, [
         { private_key: key, cert_chain: cert },
       ]);
     } else {
-      credentials = grpc.ServerCredentials.createInsecure();
+      return grpc.ServerCredentials.createInsecure();
     }
+  }
+
+  start(): Promise<void> {
     return new Promise<void>((resolve, reject) => {
-      this.server.bindAsync('localhost:0', credentials, (error, port) => {
+      this.server.bindAsync('localhost:0', this.getCredentials(), (error, port) => {
         if (error) {
           reject(error);
           return;
         }
-        this.port = port;
+        this.target = `localhost:${port}`;
         resolve();
       });
     });
   }
 
+  startUds(): Promise<void> {
+    return fsPromises.mkdtemp(path.join(os.tmpdir(), 'uds')).then(dir => {
+      return new Promise<void>((resolve, reject) => {
+        const target = `unix://${dir}/socket`;
+        this.server.bindAsync(target, this.getCredentials(), (error, port) => {
+          if (error) {
+            reject(error);
+            return;
+          }
+          this.target = target;
+          resolve();
+        });
+      });
+    });
+  }
+
   shutdown() {
     this.server.forceShutdown();
   }
+
+  getTarget() {
+    if (this.target === null) {
+      throw new Error('Server not yet started');
+    }
+    return this.target;
+  }
 }
 
 export class TestClient {
   private client: ServiceClient;
-  constructor(port: number, useTls: boolean, options?: grpc.ChannelOptions) {
+  constructor(target: string, useTls: boolean, options?: grpc.ChannelOptions) {
     let credentials: grpc.ChannelCredentials;
     if (useTls) {
       credentials = grpc.credentials.createSsl(ca);
     } else {
       credentials = grpc.credentials.createInsecure();
     }
-    this.client = new echoService(`localhost:${port}`, credentials, options);
+    this.client = new echoService(target, credentials, options);
   }
 
   static createFromServer(server: TestServer, options?: grpc.ChannelOptions) {
-    if (server.port === null) {
-      throw new Error('Cannot create client, server not started');
-    }
-    return new TestClient(server.port, server.useTls, options);
+    return new TestClient(server.getTarget(), server.useTls, options);
   }
 
   waitForReady(deadline: grpc.Deadline, callback: (error?: Error) => void) {

packages/grpc-js/test/test-idle-timer.ts

@@ -129,6 +129,47 @@ describe('Channel idle timer', () => {
   });
 });
 
+describe('Channel idle timer with UDS', () => {
+  let server: TestServer;
+  let client: TestClient | null = null;
+  before(() => {
+    server = new TestServer(false);
+    return server.startUds();
+  });
+  afterEach(() => {
+    if (client) {
+      client.close();
+      client = null;
+    }
+  });
+  after(() => {
+    server.shutdown();
+  });
+  it('Should be able to make a request after going idle', function (done) {
+    this.timeout(5000);
+    client = TestClient.createFromServer(server, {
+      'grpc.client_idle_timeout_ms': 1000,
+    });
+    client.sendRequest(error => {
+      assert.ifError(error);
+      assert.strictEqual(
+        client!.getChannelState(),
+        grpc.connectivityState.READY
+      );
+      setTimeout(() => {
+        assert.strictEqual(
+          client!.getChannelState(),
+          grpc.connectivityState.IDLE
+        );
+        client!.sendRequest(error => {
+          assert.ifError(error);
+          done();
+        });
+      }, 1100);
+    });
+  });
+});
+
 describe('Server idle timer', () => {
   let server: TestServer;
   let client: TestClient | null = null;

packages/grpc-js/test/test-pick-first.ts

@@ -811,7 +811,7 @@ describe('pick_first load balancing policy', () => {
       before(async () => {
         server = new TestServer(false);
         await server.start();
-        client = new TestClient(server.port!, false, {
+        client = TestClient.createFromServer(server, {
           'grpc.service_config': JSON.stringify(serviceConfig),
         });
       });

packages/grpc-js/test/test-server-interceptors.ts

@@ -153,7 +153,7 @@ describe('Server interceptors', () => {
         grpc.ServerCredentials.createInsecure(),
         (error, port) => {
           assert.ifError(error);
-          client = new TestClient(port, false);
+          client = new TestClient(`localhost:${port}`, false);
           done();
         }
       );
@@ -195,7 +195,7 @@ describe('Server interceptors', () => {
         grpc.ServerCredentials.createInsecure(),
         (error, port) => {
           assert.ifError(error);
-          client = new TestClient(port, false);
+          client = new TestClient(`localhost:${port}`, false);
           done();
         }
       );
@@ -246,7 +246,7 @@ describe('Server interceptors', () => {
         grpc.ServerCredentials.createInsecure(),
         (error, port) => {
           assert.ifError(error);
-          client = new TestClient(port, false);
+          client = new TestClient(`localhost:${port}`, false);
           done();
         }
       );
@@ -292,7 +292,7 @@ describe('Server interceptors', () => {
         grpc.ServerCredentials.createInsecure(),
         (error, port) => {
           assert.ifError(error);
-          client = new TestClient(port, false);
+          client = new TestClient(`localhost:${port}`, false);
           done();
         }
       );