Remove unused "fastboot" code

Ember.js "fastboot" allows us to server-render the app and send HTML over the wire. While this sounds good in theory, using it in practice has shown that it requires significantly more server-side resources and causes a lot of additional complexity. This part of the codebase hasn't been used for years and if we would move to server-side rendering then it probably would be combined with moving to a different framework/architecture. Thus it is time for the fastboot code and complexity to be removed from the codebase.

.eslintrc.js

@@ -114,7 +114,6 @@ module.exports = {
         '.eslintrc.js',
         '.template-lintrc.js',
         'ember-cli-build.js',
-        'fastboot.js',
         'testem.js',
         'blueprints/*/index.js',
         'config/**/*.js',

app/adapters/application.js

@@ -1,19 +1,8 @@
 import RESTAdapter from '@ember-data/adapter/rest';
-import { inject as service } from '@ember/service';
 
 export default class ApplicationAdapter extends RESTAdapter {
-  @service fastboot;
-
   namespace = 'api/v1';
 
-  get headers() {
-    if (this.fastboot.isFastBoot) {
-      return { 'User-Agent': this.fastboot.request.headers.get('User-Agent') };
-    }
-
-    return {};
-  }
-
   handleResponse(status, headers, payload, requestData) {
     if (typeof payload === 'string') {
       try {

app/app.js

@@ -6,11 +6,9 @@ import Resolver from 'ember-resolver';
 import config from './config/environment';
 import * as Sentry from './sentry';
 
-if (typeof FastBoot === 'undefined') {
-  // eslint-disable-next-line unicorn/prefer-add-event-listener
-  window.onerror = undefined;
-  Sentry.init();
-}
+// eslint-disable-next-line unicorn/prefer-add-event-listener
+window.onerror = undefined;
+Sentry.init();
 
 export default class App extends Application {
   modulePrefix = config.modulePrefix;

app/controllers/index.js

@@ -5,8 +5,9 @@ import { inject as service } from '@ember/service';
 import { dropTask } from 'ember-concurrency';
 import { reads } from 'macro-decorators';
 
+import ajax from '../utils/ajax';
+
 export default class IndexController extends Controller {
-  @service fetcher;
   @service store;
 
   @reads('dataTask.lastSuccessful.value') model;
@@ -22,7 +23,7 @@ export default class IndexController extends Controller {
   }
 
   dataTask = dropTask(async () => {
-    let data = await this.fetcher.ajax('/api/v1/summary');
+    let data = await ajax('/api/v1/summary');
 
     addCrates(this.store, data.new_crates);
     addCrates(this.store, data.most_downloaded);

app/initializers/hashchange.js

@@ -32,10 +32,6 @@ function hashchange() {
 }
 
 export function initialize() {
-  if (typeof window === 'undefined' || window.addEventListener === undefined) {
-    // Don't run this initializer under FastBoot
-    return;
-  }
   window.addEventListener('hashchange', hashchange);
 
   // If clicking on a link to the same fragment as currently in the address bar,

app/routes/index.js

@@ -1,15 +1,9 @@
 import Route from '@ember/routing/route';
-import { inject as service } from '@ember/service';
 
 export default class IndexRoute extends Route {
-  @service fastboot;
-
   setupController(controller) {
     if (!controller.hasData) {
-      let promise = controller.fetchData();
-      if (this.fastboot.isFastBoot) {
-        this.fastboot.deferRendering(promise);
-      }
+      controller.fetchData();
     }
   }
 }

app/services/design.js

@@ -7,8 +7,6 @@ import * as localStorage from '../utils/local-storage';
 const KNOWN_THEMES = new Set(['classic', 'new-design']);
 
 export default class DesignService extends Service {
-  @service fastboot;
-
   @tracked _theme = localStorage.getItem('theme');
   @tracked showToggleButton = config.environment === 'development' || config.environment === 'test';
 

app/services/redirector.js

@@ -1,17 +1,9 @@
-import Service, { inject as service } from '@ember/service';
+import Service from '@ember/service';
 
 import window from 'ember-window-mock';
 
 export default class RedirectorService extends Service {
-  @service fastboot;
-
   redirectTo(url) {
-    if (this.fastboot.isFastBoot) {
-      let headers = this.fastboot.response.headers;
-      headers.set('location', url);
-      this.set('fastboot.response.statusCode', 301);
-    } else {
-      window.location = url;
-    }
+    window.location = url;
   }
 }

config/environment.js

@@ -23,10 +23,6 @@ module.exports = function (environment) {
       // when it is created
     },
 
-    fastboot: {
-      hostWhitelist: ['crates.io', /^localhost:\d+$/, /\.herokuapp\.com$/],
-    },
-
     'ember-cli-notifications': {
       autoClear: true,
       clearDuration: 10_000,

config/nginx.conf.erb

@@ -232,33 +232,8 @@ http {
 			rewrite ^ https://$host$request_uri? permanent;
 		}
 
-		<% if ENV['USE_FASTBOOT'] == "staging-experimental" %>
-			# Experimentally send all non-backend requests to FastBoot
-
-			location /api/ {
-				proxy_pass http://app_server;
-			}
-
-			# FastBoot
-			location / {
-				proxy_pass http://localhost:9000;
-			}
-		<% elsif ENV['USE_FASTBOOT'] && !ENV['USE_FASTBOOT'].empty? %>
-			# Fastboot is enabled only for allowed paths
-
-			location = /policies {
-				proxy_pass http://localhost:9000;
-			}
-
-			location / {
-				proxy_pass http://app_server;
-			}
-		<% else %>
-			# FastBoot is disabled, backend sends the static Ember index HTML for non-backend paths
-
-			location / {
-				proxy_pass http://app_server;
-			}
-		<% end %>
+        location / {
+            proxy_pass http://app_server;
+        }
 	}
 }

package.json

@@ -22,10 +22,10 @@
     "lint:hbs": "ember-template-lint app",
     "lint:js": "eslint . --cache",
     "prettier": "prettier --write package.json '**/*.js'",
-    "start": "./script/ember.sh serve",
-    "start:live": "PROXY_BACKEND=https://crates.io ./script/ember.sh serve",
-    "start:local": "PROXY_BACKEND=http://127.0.0.1:8888 ./script/ember.sh serve",
-    "start:staging": "PROXY_BACKEND=https://staging-crates-io.herokuapp.com ./script/ember.sh serve",
+    "start": "ember serve",
+    "start:live": "PROXY_BACKEND=https://crates.io ember serve",
+    "start:local": "PROXY_BACKEND=http://127.0.0.1:8888 ember serve",
+    "start:staging": "PROXY_BACKEND=https://staging-crates-io.herokuapp.com ember serve",
     "test": "ember exam --split=2 --parallel",
     "test-coverage": "COVERAGE=true npm run test && ember coverage-merge && rm -rf coverage_* coverage/coverage-summary.json && nyc report"
   },
@@ -43,7 +43,6 @@
     "chart.js": "4.4.0",
     "copy-text-to-clipboard": "3.2.0",
     "date-fns": "2.30.0",
-    "fastboot-app-server": "4.1.1",
     "highlight.js": "11.9.0",
     "macro-decorators": "0.1.2",
     "mermaid": "10.5.0",
@@ -82,7 +81,6 @@
     "ember-cli-dependency-checker": "3.3.2",
     "ember-cli-dependency-lint": "2.0.1",
     "ember-cli-deprecation-workflow": "2.1.0",
-    "ember-cli-fastboot": "4.1.1",
     "ember-cli-head": "2.0.0",
     "ember-cli-htmlbars": "6.3.0",
     "ember-cli-inject-live-reload": "2.1.0",