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add a debugger example (#7)
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‎.gitignore

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**/node_modules
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**/start-time.txt
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*/.idea

‎101-debugger/.dockerignore

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node_modules

‎101-debugger/Dockerfile

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FROM node:10
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# Default value; will be overridden by build_args, if passed
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ARG node_env=production
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ENV NODE_ENV $node_env
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WORKDIR /app
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ADD package.json .
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ADD yarn.lock .
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RUN yarn install
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ADD . .
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ENTRYPOINT [ "node", "/app/index.js" ]

‎101-debugger/Tiltfile

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# -*- mode: Python -*
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k8s_yaml('kubernetes.yaml')
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k8s_resource('example-nodejs', port_forwards=[
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8000, # app itself
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9229 # debugger
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], resource_deps=['deploy']
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)
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# Records the current time, then kicks off a server update.
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# Normally, you would let Tilt do deploys automatically, but this
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# shows you how to set up a custom workflow that measures it.
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local_resource(
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'deploy',
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'python now.py > start-time.txt',
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)
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# Add a live_update rule to our docker_build
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congrats = "🎉 Congrats, you ran a live_update! 🎉"
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docker_build('example-nodejs-image', '.',
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build_args={'node_env': 'development'},
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entrypoint='yarn run nodemon --inspect=0.0.0.0:9229 /app/index.js',
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live_update=[
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sync('.', '/app'),
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run('cd /app && yarn install', trigger=['./package.json', './yarn.lock']),
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# if all that changed was start-time.txt, make sure the server
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# reloads so that it will reflect the new startup time
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run('touch /app/index.js', trigger='./start-time.txt'),
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# add a congrats message!
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run('sed -i "s/Hello cats!/{}/g" /app/views/index.mustache'.
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format(congrats)),
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])

‎101-debugger/index.js

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

‎101-debugger/kubernetes.yaml

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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: example-nodejs
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labels:
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app: example-nodejs
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spec:
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selector:
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matchLabels:
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app: example-nodejs
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template:
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metadata:
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labels:
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app: example-nodejs
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spec:
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containers:
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- name: example-nodejs
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image: example-nodejs-image
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ports:
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- name: http
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containerPort: 8000
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- name: debug
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containerPort: 9229

‎101-debugger/now.py

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import time
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print("%d" % (float(time.time()) * 1000 * 1000 * 1000))

‎101-debugger/package.json

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{
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"name": "tilt-example-nodejs",
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"version": "1.0.0",
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"main": "index.js",
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"license": "MIT",
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"dependencies": {
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"express": "^4.17.1",
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"immutable": "^3.8.2",
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"mustache-express": "^1.3.0"
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},
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"devDependencies": {
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"nodemon": "^2.0.2"
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}
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}

‎101-debugger/public/pets.png

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‎101-debugger/views/index.mustache

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<!doctype html>
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<html>
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<body style="font-size: 30px; font-family: sans-serif; margin: 0;">
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<div style="display: flex; flex-direction: column; width: 100vw; height: 100vh; align-items: center; justify-content: center;">
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<img src="pets.png" style="max-width: 30vw; max-height: 30vh;">
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<div>Hello cats!</div>
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<div>Time from "deploy" button pressed → server up: {{time}}s</div>
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</div>
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</body>
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</html>

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