added signin button color experiment. closes #1306 (#1320)

app/experiments.js

@@ -1,6 +1,22 @@
 import hash from 'string-hash';
+import Account from './ui/account';
 
-const experiments = {};
+const experiments = {
+  signin_button_color: {
+    eligible: function() {
+      return true;
+    },
+    variant: function() {
+      return ['white-blue', 'blue', 'white-violet', 'violet'][
+        Math.floor(Math.random() * 4)
+      ];
+    },
+    run: function(variant, state) {
+      const account = state.cache(Account, 'account');
+      account.buttonClass = variant;
+    }
+  }
+};
 
 //Returns a number between 0 and 1
 // eslint-disable-next-line no-unused-vars
@@ -25,23 +41,12 @@ export default function initialize(state, emitter) {
       xp.run(+state.query.v, state, emitter);
     }
   });
-
-  if (!state.storage.get('testpilot_ga__cid')) {
-    // first ever visit. check again after cid is assigned.
-    emitter.on('DOMContentLoaded', () => {
-      checkExperiments(state, emitter);
-    });
+  const enrolled = state.storage.enrolled;
+  // single experiment per session for now
+  const id = Object.keys(enrolled)[0];
+  if (Object.keys(experiments).includes(id)) {
+    experiments[id].run(enrolled[id], state, emitter);
   } else {
-    const enrolled = state.storage.enrolled.filter(([id, variant]) => {
-      const xp = experiments[id];
-      if (xp) {
-        xp.run(variant, state, emitter);
-      }
-      return !!xp;
-    });
-    // single experiment per session for now
-    if (enrolled.length === 0) {
-      checkExperiments(state, emitter);
-    }
+    checkExperiments(state, emitter);
   }
 }

app/main.css

@@ -8,6 +8,14 @@
   user-select: none;
 }
 
+:root {
+  --violet-gradient: linear-gradient(
+    -180deg,
+    rgba(144, 89, 255, 0.8) 0%,
+    rgba(144, 89, 255, 0.4) 100%
+  );
+}
+
 a {
   color: inherit;
   text-decoration: none;
@@ -300,3 +308,66 @@ select {
 .word-break-all {
   word-break: break-all;
 }
+
+.signin {
+  border-radius: 6px;
+  transition-property: transform, background-color;
+  transition-duration: 250ms;
+  transition-timing-function: cubic-bezier(0.07, 0.95, 0, 1);
+}
+
+.signin:hover,
+.signin:focus {
+  @apply shadow-btn;
+
+  transform: scale(1.0625);
+}
+
+.signin:hover:active {
+  transform: scale(0.9375);
+}
+
+/* begin signin button color experiment */
+
+.white-blue {
+  @apply border-blue-dark;
+  @apply border-2;
+  @apply text-blue-dark;
+}
+
+.white-blue:hover,
+.white-blue:focus {
+  @apply bg-blue-dark;
+  @apply text-white;
+}
+
+.blue {
+  @apply bg-blue-dark;
+  @apply text-white;
+}
+
+.white-violet {
+  @apply border-violet;
+  @apply border-2;
+  @apply text-violet;
+}
+
+.white-violet:hover,
+.white-violet:focus {
+  @apply bg-violet;
+  @apply text-white;
+
+  background-image: var(--violet-gradient);
+}
+
+.violet {
+  @apply bg-violet;
+  @apply text-white;
+}
+
+.violet:hover,
+.violet:focus {
+  background-image: var(--violet-gradient);
+}
+
+/* end signin button color experiment */

app/main.js

@@ -63,10 +63,10 @@ if (process.env.NODE_ENV === 'production') {
 
   const app = routes(choo());
   window.app = app;
+  app.use(experiments);
   app.use(metrics);
   app.use(controller);
   app.use(dragManager);
-  app.use(experiments);
   app.use(pasteManager);
   app.mount('body');
 })();

app/metrics.js

@@ -3,7 +3,7 @@ import { platform, locale } from './utils';
 import { sendMetrics } from './api';
 
 let appState = null;
-// let experiment = null;
+let experiment = null;
 const HOUR = 1000 * 60 * 60;
 const events = [];
 let session_id = Date.now();
@@ -11,11 +11,13 @@ const lang = locale();
 
 export default function initialize(state, emitter) {
   appState = state;
-  if (!appState.user.firstAction) {
-    appState.user.firstAction = appState.route === '/' ? 'upload' : 'download';
-  }
+
   emitter.on('DOMContentLoaded', () => {
-    // experiment = storage.enrolled[0];
+    experiment = storage.enrolled;
+    if (!appState.user.firstAction) {
+      appState.user.firstAction =
+        appState.route === '/' ? 'upload' : 'download';
+    }
     const query = appState.query;
     addEvent('client_visit', {
       entrypoint: appState.route === '/' ? 'upload' : 'download',
@@ -59,6 +61,11 @@ function submitEvents() {
 async function addEvent(event_type, event_properties) {
   const user_id = await appState.user.metricId();
   const device_id = await appState.user.deviceId();
+  const ab_id = Object.keys(experiment)[0];
+  if (ab_id) {
+    event_properties.experiment = ab_id;
+    event_properties.variant = experiment[ab_id];
+  }
   events.push({
     device_id,
     event_properties,

app/storage.js

@@ -86,16 +86,13 @@ class Storage {
     this.engine.setItem('referrer', str);
   }
   get enrolled() {
-    return JSON.parse(this.engine.getItem('experiments') || '[]');
+    return JSON.parse(this.engine.getItem('ab_experiments') || '{}');
   }
 
   enroll(id, variant) {
-    const enrolled = this.enrolled;
-    // eslint-disable-next-line no-unused-vars
-    if (!enrolled.find(([i, v]) => i === id)) {
-      enrolled.push([id, variant]);
-      this.engine.setItem('experiments', JSON.stringify(enrolled));
-    }
+    const enrolled = {};
+    enrolled[id] = variant;
+    this.engine.setItem('ab_experiments', JSON.stringify(enrolled));
   }
 
   get files() {

app/ui/account.js

@@ -8,6 +8,7 @@ class Account extends Component {
     this.emit = emit;
     this.enabled = state.capabilities.account;
     this.local = state.components[name] = {};
+    this.buttonClass = '';
     this.setState();
   }
 
@@ -62,7 +63,8 @@ class Account extends Component {
       return html`
         <send-account>
           <button
-            class="p-2 md:p-4 border rounded-lg text-blue-dark border-blue-dark hover:text-white hover:bg-blue-dark focus:outline"
+            class="px-4 py-2 md:px-8 md:py-4 focus:outline signin ${this
+              .buttonClass}"
             onclick="${e => this.login(e)}"
             title="${translate('signInOnlyButton')}"
           >