Update appengine/metadata/standard sample (#624)

* Update appengine/metadata/standard sample

* Fix the test

Author: chenyumic

appengine/metadata/standard/package.json

@@ -15,7 +15,7 @@
   "scripts": {
     "lint": "samples lint",
     "pretest": "npm run lint",
-    "system-test": "samples test app",
+    "system-test": "samples test app -- ./server.js",
     "test": "npm run system-test"
   },
   "dependencies": {
@@ -28,7 +28,7 @@
   "cloud-repo-tools": {
     "test": {
       "app": {
-        "msg": "External IP:",
+        "msg": "Project ID:",
         "args": [
           "server.js"
         ]

appengine/metadata/standard/server.js

@@ -22,31 +22,30 @@ const request = require('got');
 const app = express();
 app.enable('trust proxy');
 
-const METADATA_NETWORK_INTERFACE_URL = 'http://metadata/computeMetadata/v1/instance/network-interfaces/0/access-configs/0/external-ip';
+const METADATA_PROJECT_ID_URL = 'http://metadata.google.internal/computeMetadata/v1/project/project-id';
 
-function getExternalIp () {
+function getProjectId () {
   const options = {
     headers: {
       'Metadata-Flavor': 'Google'
-    },
-    json: true
+    }
   };
 
-  return request(METADATA_NETWORK_INTERFACE_URL, options)
+  return request(METADATA_PROJECT_ID_URL, options)
     .then((response) => response.body)
     .catch((err) => {
       if (err && err.statusCode !== 200) {
-        console.log('Error while talking to metadata server, assuming localhost');
-        return 'localhost';
+        console.log('Error while talking to metadata server.');
+        return 'Unknown_Project_ID';
       }
       return Promise.reject(err);
     });
 }
 
 app.get('/', (req, res, next) => {
-  getExternalIp()
-    .then((externalIp) => {
-      res.status(200).send(`External IP: ${externalIp}`).end();
+  getProjectId()
+    .then((projectId) => {
+      res.status(200).send(`Project ID: ${projectId}`).end();
     })
     .catch(next);
 });

circle.yml

@@ -101,7 +101,8 @@ deployment:
       - node scripts/build "appengine/errorreporting"
       - node scripts/build "appengine/hello-world"
       - node scripts/build "appengine/mailjet"
-      - node scripts/build "appengine/metadata"
+      - node scripts/build "appengine/metadata/flexible"
+      - node scripts/build "appengine/metadata/standard"
       - node scripts/build "appengine/static-files"
       - GCLOUD_STORAGE_BUCKET=docs-samples-gae-test-$(uuid); node scripts/build "appengine/storage"
       - node scripts/build "auth"