Issue title realtime

app/assets/javascripts/issue_show/index.js

+import Vue from 'vue';
+import IssueTitle from './issue_title';
+import '../vue_shared/vue_resource_interceptor';
+
+const vueOptions = () => ({
+  el: '.issue-title-entrypoint',
+  components: {
+    IssueTitle,
+  },
+  data() {
+    const issueTitleData = document.querySelector('.issue-title-data').dataset;
+
+    return {
+      initialTitle: issueTitleData.initialTitle,
+      endpoint: issueTitleData.endpoint,
+    };
+  },
+  template: `
+    <IssueTitle
+      :initialTitle="initialTitle"
+      :endpoint="endpoint"
+    />
+  `,
+});
+
+(() => new Vue(vueOptions()))();

app/assets/javascripts/issue_show/issue_title.js

+import Visibility from 'visibilityjs';
+import Poll from './../lib/utils/poll';
+import Service from './services/index';
+
+export default {
+  props: {
+    initialTitle: { required: true, type: String },
+    endpoint: { required: true, type: String },
+  },
+  data() {
+    const resource = new Service(this.$http, this.endpoint);
+
+    const poll = new Poll({
+      resource,
+      method: 'getTitle',
+      successCallback: (res) => {
+        this.renderResponse(res);
+      },
+      errorCallback: (err) => {
+        if (process.env.NODE_ENV !== 'production') {
+          // eslint-disable-next-line no-console
+          console.error('ISSUE SHOW TITLE REALTIME ERROR', err);
+        } else {
+          throw new Error(err);
+        }
+      },
+    });
+
+    return {
+      poll,
+      timeoutId: null,
+      title: this.initialTitle,
+    };
+  },
+  methods: {
+    fetch() {
+      this.poll.makeRequest();
+
+      Visibility.change(() => {
+        if (!Visibility.hidden()) {
+          this.poll.restart();
+        } else {
+          this.poll.stop();
+        }
+      });
+    },
+    renderResponse(res) {
+      const body = JSON.parse(res.body);
+      this.triggerAnimation(body);
+    },
+    triggerAnimation(body) {
+      const { title } = body;
+
+      /**
+      * since opacity is changed, even if there is no diff for Vue to update
+      * we must check the title even on a 304 to ensure no visual change
+      */
+      if (this.title === title) return;
+
+      this.$el.style.opacity = 0;
+
+      this.timeoutId = setTimeout(() => {
+        this.title = title;
+
+        this.$el.style.transition = 'opacity 0.2s ease';
+        this.$el.style.opacity = 1;
+
+        clearTimeout(this.timeoutId);
+      }, 100);
+    },
+  },
+  created() {
+    this.fetch();
+  },
+  template: `
+    <h2 class='title' v-html='title'></h2>
+  `,
+};

app/assets/javascripts/issue_show/services/index.js

+export default class Service {
+  constructor(resource, endpoint) {
+    this.resource = resource;
+    this.endpoint = endpoint;
+  }
+
+  getTitle() {
+    return this.resource.get(this.endpoint);
+  }
+}

app/assets/javascripts/vue_pipelines_index/stores/pipelines_store.js

 /* eslint-disable no-underscore-dangle*/
-import '../../vue_realtime_listener';
+import VueRealtimeListener from '../../vue_realtime_listener';
 
 export default class PipelinesStore {
   constructor() {
@@ -56,6 +56,6 @@ export default class PipelinesStore {
     const removeIntervals = () => clearInterval(this.timeLoopInterval);
     const startIntervals = () => startTimeLoops();
 
-    gl.VueRealtimeListener(removeIntervals, startIntervals);
+    VueRealtimeListener(removeIntervals, startIntervals);
   }
 }

app/assets/javascripts/vue_realtime_listener/index.js

-/* eslint-disable no-param-reassign */
-
-((gl) => {
-  gl.VueRealtimeListener = (removeIntervals, startIntervals) => {
-    const removeAll = () => {
-      removeIntervals();
-      window.removeEventListener('beforeunload', removeIntervals);
+export default (removeIntervals, startIntervals) => {
   window.removeEventListener('focus', startIntervals);
   window.removeEventListener('blur', removeIntervals);
-      document.removeEventListener('beforeunload', removeAll);
-    };
+  window.removeEventListener('onbeforeload', removeIntervals);
 
-    window.addEventListener('beforeunload', removeIntervals);
   window.addEventListener('focus', startIntervals);
   window.addEventListener('blur', removeIntervals);
-    document.addEventListener('beforeunload', removeAll);
-
-    // add removeAll methods to stack
-    const stack = gl.VueRealtimeListener.reset;
-    gl.VueRealtimeListener.reset = () => {
-      gl.VueRealtimeListener.reset = stack;
-      removeAll();
-      stack();
-    };
-  };
-
-  // remove all event listeners and intervals
-  gl.VueRealtimeListener.reset = () => undefined; // noop
-})(window.gl || (window.gl = {}));
+  window.addEventListener('onbeforeload', removeIntervals);
+};

app/controllers/projects/issues_controller.rb

@@ -11,10 +11,10 @@ class Projects::IssuesController < Projects::ApplicationController
   before_action :redirect_to_external_issue_tracker, only: [:index, :new]
   before_action :module_enabled
   before_action :issue, only: [:edit, :update, :show, :referenced_merge_requests,
-                               :related_branches, :can_create_branch]
+                               :related_branches, :can_create_branch, :rendered_title]
 
   # Allow read any issue
-  before_action :authorize_read_issue!, only: [:show]
+  before_action :authorize_read_issue!, only: [:show, :rendered_title]
 
   # Allow write(create) issue
   before_action :authorize_create_issue!, only: [:new, :create]
@@ -200,6 +200,11 @@ class Projects::IssuesController < Projects::ApplicationController
     end
   end
 
+  def rendered_title
+    Gitlab::PollingInterval.set_header(response, interval: 3_000)
+    render json: { title: view_context.markdown_field(@issue, :title) }
+  end
+
   protected
 
   def issue

app/models/issue.rb

@@ -40,6 +40,8 @@ class Issue < ActiveRecord::Base
 
   scope :include_associations, -> { includes(:assignee, :labels, project: :namespace) }
 
+  after_save :expire_etag_cache
+
   attr_spammable :title, spam_title: true
   attr_spammable :description, spam_description: true
 
@@ -252,4 +254,13 @@ class Issue < ActiveRecord::Base
   def publicly_visible?
     project.public? && !confidential?
   end
+
+  def expire_etag_cache
+    key = Gitlab::Routing.url_helpers.rendered_title_namespace_project_issue_path(
+      project.namespace,
+      project,
+      self
+    )
+    Gitlab::EtagCaching::Store.new.touch(key)
+  end
 end

app/views/projects/issues/show.html.haml

@@ -49,11 +49,12 @@
         = link_to 'Submit as spam', mark_as_spam_namespace_project_issue_path(@project.namespace, @project, @issue), method: :post, class: 'hidden-xs hidden-sm btn btn-grouped btn-spam', title: 'Submit as spam'
       = link_to 'Edit', edit_namespace_project_issue_path(@project.namespace, @project, @issue), class: 'hidden-xs hidden-sm btn btn-grouped issuable-edit'
 
-
 .issue-details.issuable-details
   .detail-page-description.content-block{ class: ('hide-bottom-border' unless @issue.description.present? ) }
-    %h2.title
-      = markdown_field(@issue, :title)
+    .issue-title-data.hidden{ "data" => { "initial-title" => markdown_field(@issue, :title),
+      "endpoint" => rendered_title_namespace_project_issue_path(@project.namespace, @project, @issue),
+    } }
+    .issue-title-entrypoint
     - if @issue.description.present?
       .description{ class: can?(current_user, :update_issue, @issue) ? 'js-task-list-container' : '' }
         .wiki
@@ -77,3 +78,5 @@
     = render 'projects/issues/discussion'
 
 = render 'shared/issuable/sidebar', issuable: @issue
+
+= page_specific_javascript_bundle_tag('issue_show')

config/routes/project.rb

@@ -250,6 +250,7 @@ constraints(ProjectUrlConstrainer.new) do
           get :referenced_merge_requests
           get :related_branches
           get :can_create_branch
+          get :rendered_title
         end
         collection do
           post  :bulk_update

config/webpack.config.js

@@ -46,6 +46,7 @@ var config = {
     u2f:                  ['vendor/u2f'],
     users:                './users/users_bundle.js',
     vue_pipelines:        './vue_pipelines_index/index.js',
+    issue_show:           './issue_show/index.js',
   },
 
   output: {

lib/gitlab/etag_caching/middleware.rb

@@ -3,7 +3,8 @@ module Gitlab
     class Middleware
       RESERVED_WORDS = NamespaceValidator::WILDCARD_ROUTES.map { |word| "/#{word}/" }.join('|')
       ROUTE_REGEXP = Regexp.union(
-        %r(^(?!.*(#{RESERVED_WORDS})).*/noteable/issue/\d+/notes\z)
+        %r(^(?!.*(#{RESERVED_WORDS})).*/noteable/issue/\d+/notes\z),
+        %r(^(?!.*(#{RESERVED_WORDS})).*/issues/\d+/rendered_title\z)
       )
 
       def initialize(app)

spec/features/gitlab_flavored_markdown_spec.rb

@@ -48,7 +48,9 @@ describe "GitLab Flavored Markdown", feature: true do
     end
   end
 
-  describe "for issues" do
+  describe "for issues", feature: true, js: true do
+    include WaitForVueResource
+
     before do
       @other_issue = create(:issue,
                             author: @user,
@@ -79,6 +81,14 @@ describe "GitLab Flavored Markdown", feature: true do
 
       expect(page).to have_link(fred.to_reference)
     end
+
+    it "renders updated subject once edited somewhere else in issues#show" do
+      visit namespace_project_issue_path(project.namespace, project, @issue)
+      @issue.update(title: "fix #{@other_issue.to_reference} and update")
+
+      wait_for_vue_resource
+      expect(page).to have_text("fix #{@other_issue.to_reference} and update")
+    end
   end
 
   describe "for merge requests" do

spec/features/issues/award_emoji_spec.rb

@@ -2,6 +2,7 @@ require 'rails_helper'
 
 describe 'Awards Emoji', feature: true do
   include WaitForAjax
+  include WaitForVueResource
 
   let!(:project)   { create(:project, :public) }
   let!(:user)      { create(:user) }
@@ -22,10 +23,11 @@ describe 'Awards Emoji', feature: true do
         # The `heart_tip` emoji is not valid anymore so we need to skip validation
         issue.award_emoji.build(user: user, name: 'heart_tip').save!(validate: false)
         visit namespace_project_issue_path(project.namespace, project, issue)
+        wait_for_vue_resource
       end
 
       # Regression test: https://gitlab.com/gitlab-org/gitlab-ce/issues/29529
-      it 'does not shows a 500 page' do
+      it 'does not shows a 500 page', js: true do
         expect(page).to have_text(issue.title)
       end
     end
@@ -35,6 +37,7 @@ describe 'Awards Emoji', feature: true do
 
       before do
         visit namespace_project_issue_path(project.namespace, project, issue)
+        wait_for_vue_resource
       end
 
       it 'increments the thumbsdown emoji', js: true do

spec/features/issues/move_spec.rb

@@ -37,8 +37,8 @@ feature 'issue move to another project' do
       edit_issue(issue)
     end
 
-    scenario 'moving issue to another project' do
-      first('#move_to_project_id', visible: false).set(new_project.id)
+    scenario 'moving issue to another project', js: true do
+      find('#move_to_project_id', visible: false).set(new_project.id)
       click_button('Save changes')
 
       expect(current_url).to include project_path(new_project)

spec/features/issues/spam_issues_spec.rb

 require 'rails_helper'
 
-describe 'New issue', feature: true do
+describe 'New issue', feature: true, js: true do
   include StubENV
 
   let(:project) { create(:project, :public) }

spec/features/issues_spec.rb

@@ -695,4 +695,21 @@ describe 'Issues', feature: true do
       end
     end
   end
+
+  describe 'title issue#show', js: true do
+    include WaitForVueResource
+
+    it 'updates the title', js: true do
+      issue = create(:issue, author: @user, assignee: @user, project: project, title: 'new title')
+
+      visit namespace_project_issue_path(project.namespace, project, issue)
+
+      expect(page).to have_text("new title")
+
+      issue.update(title: "updated title")
+
+      wait_for_vue_resource
+      expect(page).to have_text("updated title")
+    end
+  end
 end

spec/javascripts/issue_show/issue_title_spec.js

+import Vue from 'vue';
+import issueTitle from '~/issue_show/issue_title';
+
+describe('Issue Title', () => {
+  let IssueTitleComponent;
+
+  beforeEach(() => {
+    IssueTitleComponent = Vue.extend(issueTitle);
+  });
+
+  it('should render a title', () => {
+    const component = new IssueTitleComponent({
+      propsData: {
+        initialTitle: 'wow',
+        endpoint: '/gitlab-org/gitlab-shell/issues/9/rendered_title',
+      },
+    }).$mount();
+
+    expect(component.$el.classList).toContain('title');
+    expect(component.$el.innerHTML).toContain('wow');
+  });
+});

spec/javascripts/test_bundle.js

@@ -64,6 +64,7 @@ if (process.env.BABEL_ENV === 'coverage') {
     './snippet/snippet_bundle.js',
     './terminal/terminal_bundle.js',
     './users/users_bundle.js',
+    './issue_show/index.js',
   ];
 
   describe('Uncovered files', function () {