In development, allow the toggling of the performance bar

The performance bar is still displayed by default in development.
Signed-off-by: Rémy Coutable <remy@rymai.me>

app/assets/javascripts/shortcuts.js

@@ -62,7 +62,7 @@ export default class Shortcuts {
     e.preventDefault();
     const performanceBarCookieName = 'perf_bar_enabled';
     if (Cookies.get(performanceBarCookieName) === 'true') {
-      Cookies.remove(performanceBarCookieName, { path: '/' });
+      Cookies.set(performanceBarCookieName, 'false', { path: '/' });
     } else {
       Cookies.set(performanceBarCookieName, 'true', { path: '/' });
     }

app/controllers/concerns/with_performance_bar.rb

@@ -6,13 +6,22 @@ module WithPerformanceBar
   end
 
   def peek_enabled?
-    return true if Rails.env.development?
     return false unless Gitlab::PerformanceBar.enabled?(current_user)
 
     if RequestStore.active?
-      RequestStore.fetch(:peek_enabled) { cookies[:perf_bar_enabled].present? }
+      RequestStore.fetch(:peek_enabled) { cookie_or_default_value }
     else
-      cookies[:perf_bar_enabled].present?
+      cookie_or_default_value
+    end
+  end
+
+  private
+
+  def cookie_or_default_value
+    if cookies[:perf_bar_enabled].present?
+      cookies[:perf_bar_enabled] == 'true'
+    else
+      cookies[:perf_bar_enabled] = 'true' if Rails.env.development?
     end
   end
 end

lib/gitlab/performance_bar.rb

@@ -6,6 +6,7 @@ module Gitlab
     EXPIRY_TIME = 5.minutes
 
     def self.enabled?(user = nil)
+      return true if Rails.env.development?
       return false unless user && allowed_group_id
 
       allowed_user_ids.include?(user.id)

spec/features/user_can_display_performance_bar_spec.rb

 require 'rails_helper'
 
 describe 'User can display performance bar', :js do
-  shared_examples 'performance bar is disabled' do
+  shared_examples 'performance bar cannot be displayed' do
     it 'does not show the performance bar by default' do
       expect(page).not_to have_css('#peek')
     end
@@ -17,7 +17,7 @@ describe 'User can display performance bar', :js do
     end
   end
 
-  shared_examples 'performance bar is enabled' do
+  shared_examples 'performance bar can be displayed' do
     it 'does not show the performance bar by default' do
       expect(page).not_to have_css('#peek')
     end
@@ -33,6 +33,18 @@ describe 'User can display performance bar', :js do
     end
   end
 
+  shared_examples 'performance bar is enabled by default in development' do
+    before do
+      allow(Rails.env).to receive(:development?).and_return(true)
+    end
+
+    it 'shows the performance bar by default' do
+      refresh # Because we're stubbing Rails.env after the 1st visit to root_path
+
+      expect(page).to have_css('#peek')
+    end
+  end
+
   let(:group) { create(:group) }
 
   context 'when user is logged-out' do
@@ -45,7 +57,7 @@ describe 'User can display performance bar', :js do
         stub_application_setting(performance_bar_allowed_group_id: nil)
       end
 
-      it_behaves_like 'performance bar is disabled'
+      it_behaves_like 'performance bar cannot be displayed'
     end
 
     context 'when the performance_bar feature is enabled' do
@@ -53,7 +65,7 @@ describe 'User can display performance bar', :js do
         stub_application_setting(performance_bar_allowed_group_id: group.id)
       end
 
-      it_behaves_like 'performance bar is disabled'
+      it_behaves_like 'performance bar cannot be displayed'
     end
   end
 
@@ -72,7 +84,8 @@ describe 'User can display performance bar', :js do
         stub_application_setting(performance_bar_allowed_group_id: nil)
       end
 
-      it_behaves_like 'performance bar is disabled'
+      it_behaves_like 'performance bar cannot be displayed'
+      it_behaves_like 'performance bar is enabled by default in development'
     end
 
     context 'when the performance_bar feature is enabled' do
@@ -80,7 +93,8 @@ describe 'User can display performance bar', :js do
         stub_application_setting(performance_bar_allowed_group_id: group.id)
       end
 
-      it_behaves_like 'performance bar is enabled'
+      it_behaves_like 'performance bar is enabled by default in development'
+      it_behaves_like 'performance bar can be displayed'
     end
   end
 end