Serve dependent modules from cdnjs

README.md

@@ -7,7 +7,7 @@
   <img src="https://raw.githubusercontent.com/wiki/ks888/LambStatus/images/TwitterButton_h42.png" alt="Twitter" height="20px">
 </a>
 
-LambStatus is a status page system inspired by [StatusPage.io](https://www.statuspage.io/), built on AWS Lambda.
+LambStatus is a serverless status page system inspired by [StatusPage.io](https://www.statuspage.io/).
 
 With a few clicks, You can build a status page like this:
 
@@ -20,18 +20,19 @@ The demo pages are available:
 ## Goals of this project
 
 * Offers an open source and serverless status page system.
-* Enables you to deploy and maintain the status page system at minimum effort.
+* Offers a pay-as-you-go pricing approach like AWS. We estimate the system takes just *$1 to handle 30,000 visitors* ([see details](https://github.com/ks888/LambStatus/wiki/Cost-estimate)).
+* Enables you to build and maintain the status page system at minimum effort.
 
 ## Why Serverless?
 
 Status page system is great with the Serverless architecture, because:
 
-* It dramatically eases your pain caused by the scaling / availability issues. It is terrible if your service is down AND heavy traffic from stuck users stops your status page.
-* It reduces your infrastructure cost. A status page usually gets very low traffic and occasionally huge traffic. You only pay for the traffic that you handle.
+* It eases your pain caused by the scaling / availability issues. It is terrible if your service is down AND heavy traffic from stuck users stops your status page.
+* It enables you to pay only for what you use. A status page only occasionally gets huge traffic. The system takes only $1 per 30,000 visitors and almost $0 if no visitors.
 
 Apart from the Serverless architecture, LambStatus enables you to:
 
-* Easily build and update the system (by the power of the CloudFormation)
+* Build and update the system with a few clicks (by the power of the CloudFormation)
 * Choose the AWS region different from your service's region. If both your service and its status page rely on the same region, [the region outage](https://aws.amazon.com/message/41926/) may stop both.
 
 ## Installation

packages/frontend/build/cdn.js

@@ -0,0 +1,29 @@
+import { spawnSync } from 'child_process'
+
+let depsCache
+
+const listDependencies = function () {
+  if (depsCache !== undefined) return depsCache
+
+  const rawDeps = spawnSync('npm', ['list', '--json'])
+  depsCache = JSON.parse(rawDeps.stdout)
+  return depsCache
+}
+
+const getVersion = function (cdnModule) {
+  let curr = listDependencies()
+  cdnModule.dependedBy.forEach(function (dep) {
+    curr = curr.dependencies[dep]
+  })
+  return curr.dependencies[cdnModule.moduleName].version
+}
+
+export const buildScriptURL = function (cdnModule) {
+  const version = getVersion(cdnModule)
+  return `https://cdnjs.cloudflare.com/ajax/libs/${cdnModule.libraryName}/${version}/${cdnModule.scriptPath}`
+}
+
+export const buildCSSURL = function (cdnModule) {
+  const version = getVersion(cdnModule)
+  return `https://cdnjs.cloudflare.com/ajax/libs/${cdnModule.libraryName}/${version}/${cdnModule.cssPath}`
+}

packages/frontend/build/webpack.config.js

@@ -4,9 +4,36 @@ import HtmlWebpackPlugin from 'html-webpack-plugin'
 import ExtractTextPlugin from 'extract-text-webpack-plugin'
 import CopyWebpackPlugin from 'copy-webpack-plugin'
 import _debug from 'debug'
+import { buildScriptURL, buildCSSURL } from './cdn'
 
 const debug = _debug('app:webpack:config')
 
+// These modules are served from cdnjs.
+// 'moduleName' and 'dependedBy' are used to resolve the module version.
+// 'libraryName', 'cssPath' and 'scriptPath' are used to build the cdn url.
+// If defined, 'external' is used to build the 'externals' option of webpack.
+/* eslint-disable max-len */
+const modulesServedFromCDN = [
+  {moduleName: 'c3', dependedBy: [], libraryName: 'c3', cssPath: 'c3.css', scriptPath: 'c3.js', external: 'c3'},
+  {moduleName: 'd3', dependedBy: ['c3'], libraryName: 'd3', scriptPath: 'd3.js'},
+  {moduleName: 'react', dependedBy: [], libraryName: 'react', scriptPath: 'react.js', external: 'React'},
+  {moduleName: 'react-dom', dependedBy: [], libraryName: 'react', scriptPath: 'react-dom.js', external: 'ReactDOM'},
+  {moduleName: 'react-router', dependedBy: [], libraryName: 'react-router', scriptPath: 'ReactRouter.js', external: 'ReactRouter'},
+  {moduleName: 'moment', dependedBy: ['moment-timezone'], libraryName: 'moment.js', scriptPath: 'moment.js'},
+  {moduleName: 'moment-timezone', dependedBy: [], libraryName: 'moment-timezone', scriptPath: 'moment-timezone-with-data.js', external: 'moment'}
+]
+/* eslint-enable max-len */
+
+const cssServedFromCDN = modulesServedFromCDN.reduce(function (prev, curr) {
+  if (curr.cssPath !== undefined) prev.push(buildCSSURL(curr))
+  return prev
+}, [])
+
+const scriptsServedFromCDN = modulesServedFromCDN.reduce(function (prev, curr) {
+  if (curr.scriptPath !== undefined) prev.push(buildScriptURL(curr))
+  return prev
+}, [])
+
 export default function (config) {
   const paths = config.utils_paths
   const {__DEV__, __PROD__, __TEST__, __COVERAGE__} = config.globals
@@ -40,8 +67,7 @@ export default function (config) {
   webpackConfig.entry = {
     app: __DEV__
       ? APP_ENTRY_PATHS.concat(`webpack-hot-middleware/client?path=${config.compiler_public_path}__webpack_hmr`)
-      : APP_ENTRY_PATHS,
-    vendor: config.compiler_vendor
+      : APP_ENTRY_PATHS
   }
 
   // ------------------------------------
@@ -52,6 +78,12 @@ export default function (config) {
     path: paths.dist(),
     publicPath: config.compiler_public_path
   }
+  if (!__TEST__) {
+    webpackConfig.externals = modulesServedFromCDN.reduce(function (prev, curr) {
+      if (curr.external !== undefined) prev[curr.moduleName] = curr.external
+      return prev
+    }, {})
+  }
 
   // ------------------------------------
   // Plugins
@@ -66,12 +98,13 @@ export default function (config) {
       inject: 'body',
       minify: {
         collapseWhitespace: true
-      }
+      },
+      stylesheets: cssServedFromCDN,
+      scripts: scriptsServedFromCDN
     }),
     new CopyWebpackPlugin([
       { from: 'config/settings.js' }
-    ]),
-    new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/)
+    ])
   ]
 
   if (__DEV__) {
@@ -95,15 +128,6 @@ export default function (config) {
     )
   }
 
-  // Don't split bundles during testing, since we only want import one bundle
-  if (!__TEST__) {
-    webpackConfig.plugins.push(
-      new webpack.optimize.CommonsChunkPlugin({
-        names: ['vendor']
-      })
-    )
-  }
-
   // ------------------------------------
   // Pre-Loaders
   // ------------------------------------

packages/frontend/config/index.js

@@ -44,16 +44,6 @@ export default function () {
       chunkModules : false,
       colors : true
     },
-    compiler_vendor : [
-      'history',
-      'react',
-      'react-dom',
-      'react-redux',
-      'react-router',
-      'react-router-redux',
-      'redux',
-      'moment-timezone'
-    ],
     compiler_alias: {},
 
     // ----------------------------------
@@ -88,22 +78,6 @@ export default function () {
     '__BASENAME__' : JSON.stringify(process.env.BASENAME || '')
   }
 
-  // ------------------------------------
-  // Validate Vendor Dependencies
-  // ------------------------------------
-  const pkg = require('../package.json')
-
-  config.compiler_vendor = config.compiler_vendor
-    .filter((dep) => {
-      if (pkg.dependencies[dep]) return true
-
-      debug(
-        `Package "${dep}" was not found as an npm dependency in package.json; ` +
-        `it won't be included in the webpack vendor bundle.
-         Consider removing it from vendor_dependencies in ~/config/index.js`
-      )
-    })
-
   // ------------------------------------
   // Utilities
   // ------------------------------------

packages/frontend/src/components/common/MetricsGraph/MetricsGraph.js

@@ -1,7 +1,6 @@
 import React, { PropTypes } from 'react'
 import classnames from 'classnames'
 import c3 from 'c3'
-import 'c3/c3.css'
 import { timeframes, getXAxisFormat, getTooltipTitleFormat, getIncrementTimestampFunc, getNumDates } from 'utils/status'
 import classes from './MetricsGraph.scss'
 import './MetricsGraph.global.scss'

packages/frontend/src/index.html

@@ -7,9 +7,15 @@
   <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
   <link href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700" rel="stylesheet">
   <link rel="stylesheet" href="https://code.getmdl.io/1.2.1/material.blue_grey-amber.min.css" />
+  <% for (var i in htmlWebpackPlugin.options.stylesheets) { %>
+  <link rel="stylesheet" href="<%= htmlWebpackPlugin.options.stylesheets[i] %>" />
+  <% } %>
 </head>
 <body style="height: 100%">
   <div id="root" style="height: 100%"></div>
+  <% for (var i in htmlWebpackPlugin.options.scripts) { %>
+  <script src="<%= htmlWebpackPlugin.options.scripts[i] %>"></script>
+  <% } %>
   <script src="https://code.getmdl.io/1.2.1/material.min.js"></script>
   <script src="/settings.js"></script>
 </body>

packages/lambda/src/utils/cache.js

@@ -1,5 +1,6 @@
 const oneYearBySeconds = 31536000
 const oneDayBySeconds = 86400
+const tenSeconds = 10
 
 export const getCacheControl = (contentType) => {
   const prefix = 'max-age='
@@ -11,6 +12,7 @@ export const getCacheControl = (contentType) => {
       return prefix + oneDayBySeconds
     case 'text/html':
     case 'application/json':
+      return prefix + tenSeconds
     default:
       return prefix + 0
   }

packages/lambda/test/aws/s3.js

@@ -46,7 +46,7 @@ describe('S3', () => {
       const objectName = 'test.html'
       const body = 'data'
       const contentType = 'text/html'
-      const cacheControl = 'max-age=0'
+      const cacheControl = 'max-age=10'
       let actual
       AWS.mock('S3', 'putObject', (params, callback) => {
         actual = params
@@ -119,7 +119,7 @@ describe('S3', () => {
       const destBucketName = 'test'
       const destObjectName = 'test.html'
       const contentType = 'text/html'
-      const cacheControl = 'max-age=0'
+      const cacheControl = 'max-age=10'
       let actual
       AWS.mock('S3', 'copyObject', (params, callback) => {
         actual = params

packages/lambda/test/utils/cache.js

@@ -5,7 +5,7 @@ describe('cache', () => {
   describe('getCacheControl', () => {
     it('should return CacheControl value', async () => {
       assert(getCacheControl('application/javascript') === 'max-age=31536000')
-      assert(getCacheControl('text/html') === 'max-age=0')
+      assert(getCacheControl('text/html') === 'max-age=10')
       assert(getCacheControl() === 'max-age=0')
     })
   })