add benchmarking

Author: maiamcc

.gitignore

@@ -1 +1,2 @@
 **/node_modules
+**/start-time.txt

3-recommended/Tiltfile

@@ -2,32 +2,30 @@
 
 k8s_yaml('kubernetes.yaml')
 k8s_resource('example-nodejs', port_forwards=8000,
-             #resource_deps=['deploy']
-             )
+    resource_deps=['deploy']
+)
 
 # Records the current time, then kicks off a server update.
 # Normally, you would let Tilt do deploys automatically, but this
 # shows you how to set up a custom workflow that measures it.
-# local_resource(
-#     'deploy',
-#     'date +%s%N > start-time.txt',
-# )
+local_resource(
+    'deploy',
+    'date +%s%N > start-time.txt',
+)
 
 # Add a live_update rule to our docker_build
-# congrats = "🎉 Congrats, you ran a live_update! 🎉"
+congrats = "🎉 Congrats, you ran a live_update! 🎉"
 docker_build('example-nodejs-image', '.',
     live_update=[
         sync('.', '/app'),
-        sync('./package.json', '/app/package.json'),
-        sync('./yarn.lock', '/app/yarn.lock'),
         run('cd /app && yarn install', trigger=['./package.json', './yarn.lock']),
 
         # if all that changed was start-time.txt, make sure the server
         # reloads so that it will reflect the new startup time
-        # run('touch /app/app.py', trigger='./start-time.txt'),
+        run('touch /app/index.js', trigger='./start-time.txt'),
 
         # add a congrats message!
-        # run('sed -i "s/Hello cats!/{}/g" /app/templates/index.html'.
-        #     format(congrats)),
+        run('sed -i "s/Hello cats!/{}/g" /app/views/index.mustache'.
+            format(congrats)),
 ])
 

3-recommended/index.js

@@ -1,24 +1,34 @@
 /*
  Gratefully adapted from https://github.com/HemingwayLee/sample-mustache-express
 */
+const fs = require('fs');
+
 const express = require('express');
 const app = express();
 const mustacheExpress = require('mustache-express');
 
+let timeSince = 'N/A';
+
 app.engine('mustache', mustacheExpress());
 
 app.set('view engine', 'mustache');
 app.set('views', __dirname + '/views');
-app.use(express.static('public'))
+app.use(express.static('public'));
 
 app.get('/', function(req, res) {
-    const data = {
-        time: 'a million years'
-    };
-
-    res.render('index.mustache', data);
+    res.render('index.mustache', {
+        time: timeSince,
+    });
 });
 
 app.listen(8000, () => {
+    timeSince = getSecsElapsedSinceDeploy();
     console.log('Server running at http://localhost:8000/');
 });
+
+function getSecsElapsedSinceDeploy() {
+    let curTimeMs = new Date().getTime();
+    let contents = fs.readFileSync('/app/start-time.txt', 'utf8');
+    let startTimeMs  = parseInt(contents.trim()) / 10**6;
+    return ((curTimeMs - startTimeMs) / 10**3).toFixed(2)
+}