From 6b13a226ddfc49140d58e7e88f8703ae0ed90574 Mon Sep 17 00:00:00 2001
From: GitLab Bot <gitlab-bot@gitlab.com>
Date: Fri, 29 Nov 2019 09:06:31 +0000
Subject: Add latest changes from gitlab-org/gitlab@master

---
 .../components/performance_bar_app.vue             |  5 +++
 app/assets/javascripts/performance_bar/index.js    | 50 ++++++++++++++++++++++
 .../stores/performance_bar_store.js                | 10 +++++
 3 files changed, 65 insertions(+)

(limited to 'app/assets/javascripts/performance_bar')

diff --git a/app/assets/javascripts/performance_bar/components/performance_bar_app.vue b/app/assets/javascripts/performance_bar/components/performance_bar_app.vue
index a0272b148e3..d17c2f33adc 100644
--- a/app/assets/javascripts/performance_bar/components/performance_bar_app.vue
+++ b/app/assets/javascripts/performance_bar/components/performance_bar_app.vue
@@ -52,6 +52,11 @@ export default {
       header: s__('PerformanceBar|Redis calls'),
       keys: ['cmd'],
     },
+    {
+      metric: 'total',
+      header: s__('PerformanceBar|Frontend resources'),
+      keys: ['name', 'size'],
+    },
   ],
   data() {
     return { currentRequestId: '' };
diff --git a/app/assets/javascripts/performance_bar/index.js b/app/assets/javascripts/performance_bar/index.js
index 735c9d804ee..2ffe07500e0 100644
--- a/app/assets/javascripts/performance_bar/index.js
+++ b/app/assets/javascripts/performance_bar/index.js
@@ -1,3 +1,4 @@
+/* eslint-disable @gitlab/i18n/no-non-i18n-strings */
 import Vue from 'vue';
 import axios from '~/lib/utils/axios_utils';
 
@@ -53,12 +54,61 @@ export default ({ container }) =>
         PerformanceBarService.fetchRequestDetails(this.peekUrl, requestId)
           .then(res => {
             this.store.addRequestDetails(requestId, res.data);
+
+            if (this.requestId === requestId) this.collectFrontendPerformanceMetrics();
           })
           .catch(() =>
             // eslint-disable-next-line no-console
             console.warn(`Error getting performance bar results for ${requestId}`),
           );
       },
+      collectFrontendPerformanceMetrics() {
+        if (performance) {
+          const navigationEntries = performance.getEntriesByType('navigation');
+          const paintEntries = performance.getEntriesByType('paint');
+          const resourceEntries = performance.getEntriesByType('resource');
+
+          let durationString = '';
+          if (navigationEntries.length > 0) {
+            durationString = `BE ${this.formatMs(navigationEntries[0].responseEnd)} / `;
+            durationString += `FCP ${this.formatMs(paintEntries[1].startTime)} / `;
+            durationString += `DOM ${this.formatMs(navigationEntries[0].domContentLoadedEventEnd)}`;
+          }
+
+          let newEntries = resourceEntries.map(this.transformResourceEntry);
+
+          this.updateFrontendPerformanceMetrics(durationString, newEntries);
+
+          if ('PerformanceObserver' in window) {
+            // We start observing for more incoming timings
+            const observer = new PerformanceObserver(list => {
+              newEntries = newEntries.concat(list.getEntries().map(this.transformResourceEntry));
+              this.updateFrontendPerformanceMetrics(durationString, newEntries);
+            });
+
+            observer.observe({ entryTypes: ['resource'] });
+          }
+        }
+      },
+      updateFrontendPerformanceMetrics(durationString, requestEntries) {
+        this.store.setRequestDetailsData(this.requestId, 'total', {
+          duration: durationString,
+          calls: requestEntries.length,
+          details: requestEntries,
+        });
+      },
+      transformResourceEntry(entry) {
+        const nf = new Intl.NumberFormat();
+        return {
+          name: entry.name.replace(document.location.origin, ''),
+          duration: Math.round(entry.duration),
+          size: entry.transferSize ? `${nf.format(entry.transferSize)} bytes` : 'cached',
+        };
+      },
+      formatMs(msValue) {
+        const nf = new Intl.NumberFormat();
+        return `${nf.format(Math.round(msValue))}ms`;
+      },
     },
     render(createElement) {
       return createElement('performance-bar-app', {
diff --git a/app/assets/javascripts/performance_bar/stores/performance_bar_store.js b/app/assets/javascripts/performance_bar/stores/performance_bar_store.js
index 12d0ee86218..6f443db47ed 100644
--- a/app/assets/javascripts/performance_bar/stores/performance_bar_store.js
+++ b/app/assets/javascripts/performance_bar/stores/performance_bar_store.js
@@ -32,6 +32,16 @@ export default class PerformanceBarStore {
     return request;
   }
 
+  setRequestDetailsData(requestId, metricKey, requestDetailsData) {
+    const selectedRequest = this.findRequest(requestId);
+    if (selectedRequest) {
+      selectedRequest.details = {
+        ...selectedRequest.details,
+        [metricKey]: requestDetailsData,
+      };
+    }
+  }
+
   requestsWithDetails() {
     return this.requests.filter(request => request.details);
   }
-- 
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