Fix tracking url in AML (#2830)

src/nni_manager/training_service/reusable/aml/amlClient.ts

@@ -74,13 +74,11 @@ export class AMLClient {
             throw Error('python shell client not initialized!');
         }
         this.pythonShellClient.send('tracking_url');
-        let trackingUrl = '';
-        this.pythonShellClient.on('message', function (status: any) {
-            const items = status.split(':');
-            if (items[0] === 'tracking_url') {
-                trackingUrl = items.splice(1, items.length).join('')
-            }
+        this.pythonShellClient.on('message', (status: any) => {
+            const trackingUrl = this.parseContent('tracking_url', status);
+            if (trackingUrl !== '') {
                 deferred.resolve(trackingUrl);
+            }
         });
         this.monitorError(this.pythonShellClient, deferred);
         return deferred.promise;
@@ -91,12 +89,11 @@ export class AMLClient {
         if (this.pythonShellClient === undefined) {
             throw Error('python shell client not initialized!');
         }
-        let newStatus = oldStatus;
         this.pythonShellClient.send('update_status');
-        this.pythonShellClient.on('message', function (status: any) {
-            const items = status.split(':');
-            if (items[0] === 'status') {
-                newStatus = items.splice(1, items.length).join('')
+        this.pythonShellClient.on('message', (status: any) => {
+            let newStatus = this.parseContent('status', status);
+            if (newStatus === '') {
+                newStatus = oldStatus;
             }
             deferred.resolve(newStatus);
         });
@@ -117,10 +114,10 @@ export class AMLClient {
             throw Error('python shell client not initialized!');
         }
         this.pythonShellClient.send('receive');
-        this.pythonShellClient.on('message', function (command: any) {
-            const items = command.split(':')
-            if (items[0] === 'receive') {
-                deferred.resolve(JSON.parse(command.slice(8)))
+        this.pythonShellClient.on('message', (command: any) => {
+            const message = this.parseContent('receive', command);
+            if (message !== '') {
+                deferred.resolve(JSON.parse(message))
             }
         });
         this.monitorError(this.pythonShellClient, deferred);
@@ -136,4 +133,13 @@ export class AMLClient {
             deferred.reject(error);
         });
     }
+    
+    // Parse command content, command format is {head}:{content}
+    public parseContent(head: string, command: string): string {
+        const items = command.split(':');
+        if (items[0] === head) {
+            return command.slice(head.length + 1);
+        }
+        return '';
+    }
 }

src/nni_manager/training_service/reusable/test/amlClient.test.ts

+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+import * as chai from 'chai';
+import { cleanupUnitTest, prepareUnitTest } from '../../../common/utils';
+import chaiAsPromised = require("chai-as-promised");
+import { AMLClient } from '../aml/amlClient';
+
+
+describe('Unit Test for amlClient', () => {
+
+    before(() => {
+        chai.should();
+        chai.use(chaiAsPromised);
+        prepareUnitTest();
+    });
+
+    after(() => {
+        cleanupUnitTest();
+    });
+
+    it('test parseContent', async () => {
+
+        let amlClient: AMLClient = new AMLClient('', '', '', '', '', '', '', '');
+    
+        chai.assert.equal(amlClient.parseContent('test', 'test:1234'), '1234', "The content should be 1234");
+        chai.assert.equal(amlClient.parseContent('test', 'abcd:1234'), '', "The content should be null");
+    });
+});