Advanced Search: Create feature flags to disable some tabs

app/controllers/search_controller.rb

@@ -11,7 +11,7 @@ class SearchController < ApplicationController
 
   around_action :allow_gitaly_ref_name_caching
 
-  before_action :block_anonymous_global_searches, except: :opensearch
+  before_action :block_anonymous_global_searches, :check_scope_global_search_enabled, except: :opensearch
   skip_before_action :authenticate_user!
   requires_cross_project_access if: -> do
     search_term_present = params[:search].present? || params[:term].present?
@@ -156,6 +156,29 @@ class SearchController < ApplicationController
     redirect_to new_user_session_path, alert: _('You must be logged in to search across all of GitLab')
   end
 
+  def check_scope_global_search_enabled
+    return if params[:project_id].present? || params[:group_id].present?
+
+    search_allowed = case params[:scope]
+                     when 'blobs'
+                       Feature.enabled?(:global_search_code_tab, current_user, type: :ops, default_enabled: true)
+                     when 'commits'
+                       Feature.enabled?(:global_search_commits_tab, current_user, type: :ops, default_enabled: true)
+                     when 'issues'
+                       Feature.enabled?(:global_search_issues_tab, current_user, type: :ops, default_enabled: true)
+                     when 'merge_requests'
+                       Feature.enabled?(:global_search_merge_requests_tab, current_user, type: :ops, default_enabled: true)
+                     when 'wiki_blobs'
+                       Feature.enabled?(:global_search_wiki_tab, current_user, type: :ops, default_enabled: true)
+                     else
+                       true
+                     end
+
+    return if search_allowed
+
+    redirect_to search_path, alert: _('Global Search is disabled for this scope')
+  end
+
   def render_timeout(exception)
     raise exception unless action_name.to_sym.in?(RESCUE_FROM_TIMEOUT_ACTIONS)
 

app/helpers/search_helper.rb

@@ -443,6 +443,10 @@ module SearchHelper
       _("Open")
     end
   end
+
+  def feature_flag_tab_enabled?(flag)
+    @group || Feature.enabled?(flag, current_user, type: :ops, default_enabled: true)
+  end
 end
 
 SearchHelper.prepend_mod_with('SearchHelper')

app/views/search/_category.html.haml

@@ -27,11 +27,11 @@
       = search_filter_link 'snippet_titles', _("Titles and Descriptions"), search: { snippets: true, group_id: nil, project_id: nil }
     - else
       = search_filter_link 'projects', _("Projects"), data: { qa_selector: 'projects_tab' }
-      = render_if_exists 'search/category_code'
+      = render_if_exists 'search/category_code' if feature_flag_tab_enabled?(:global_search_code_tab)
       = render_if_exists 'search/epics_filter_link'
-      = search_filter_link 'issues', _("Issues")
-      = search_filter_link 'merge_requests', _("Merge requests")
-      = render_if_exists 'search/category_wiki'
+      = search_filter_link 'issues', _("Issues") if feature_flag_tab_enabled?(:global_search_issues_tab)
+      = search_filter_link 'merge_requests', _("Merge requests") if feature_flag_tab_enabled?(:global_search_merge_requests_tab)
+      = render_if_exists 'search/category_wiki' if feature_flag_tab_enabled?(:global_search_wiki_tab)
       = render_if_exists 'search/category_elasticsearch'
       = search_filter_link 'milestones', _("Milestones")
       = users

config/feature_flags/ops/global_search_code_tab.yml

+---
+name: global_search_code_tab
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/68640
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/339207
+milestone: '14.3'
+type: ops
+group: group::global search
+default_enabled: true

config/feature_flags/ops/global_search_commits_tab.yml

+---
+name: global_search_commits_tab
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/68640
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/339207
+milestone: '14.3'
+type: ops
+group: group::global search
+default_enabled: true

config/feature_flags/ops/global_search_issues_tab.yml

+---
+name: global_search_issues_tab
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/68640
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/339207
+milestone: '14.3'
+type: ops
+group: group::global search
+default_enabled: true

config/feature_flags/ops/global_search_merge_requests_tab.yml

+---
+name: global_search_merge_requests_tab
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/68640
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/339207
+milestone: '14.3'
+type: ops
+group: group::global search
+default_enabled: true

config/feature_flags/ops/global_search_wiki_tab.yml

+---
+name: global_search_wiki_tab
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/68640
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/339207
+milestone: '14.3'
+type: ops
+group: group::global search
+default_enabled: true

doc/user/search/advanced_search.md

@@ -119,3 +119,24 @@ You can search a specific issue or merge request by its ID with a special prefix
 
 - To search by issue ID, use prefix `#` followed by issue ID. For example, [#23456](https://gitlab.com/search?snippets=&scope=issues&repository_ref=&search=%2323456&group_id=9970&project_id=278964)
 - To search by merge request ID, use prefix `!` followed by merge request ID. For example [!23456](https://gitlab.com/search?snippets=&scope=merge_requests&repository_ref=&search=%2123456&group_id=9970&project_id=278964)
+
+## Global search scopes **(FREE SELF)**
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/68640) in GitLab 14.3.
+
+To improve the performance of your instance's global search, you can limit
+the scope of the search. To do so, you can exclude global search scopes by disabling
+[`ops` feature flags](../../development/feature_flags/index.md#ops-type).
+
+Global search has all its scopes **enabled** by default in GitLab SaaS and
+self-managed instances. A GitLab administrator can disable the following `ops`
+feature flags to limit the scope of your instance's global search and optimize
+its performance:
+
+| Scope | Feature flag | Description |
+|--|--|--|
+| Code | `global_search_code_tab` | When enabled, the global search includes code as part of the search. |
+| Commits | `global_search_commits_tab` | When enabled, the global search includes commits as part of the search. |
+| Issues | `global_search_issues_tab` | When enabled, the global search includes issues as part of the search. |
+| Merge Requests | `global_search_merge_requests_tab` | When enabled, the global search includes merge requests as part of the search. |
+| Wiki | `global_search_wiki_tab` | When enabled, the global search includes wiki as part of the search. |

ee/app/views/search/_category_elasticsearch.html.haml

 - if search_service.show_elasticsearch_tabs?
-  = search_filter_link 'commits', _("Commits")
+  = search_filter_link 'commits', _("Commits") if feature_flag_tab_enabled?(:global_search_commits_tab)
   = search_filter_link 'notes', _("Comments")

ee/spec/views/search/_category.html.haml_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'search/_category' do
+  let_it_be(:group) { create(:group) }
+
+  context 'feature flags' do
+    using RSpec::Parameterized::TableSyntax
+
+    before do
+      stub_ee_application_setting(elasticsearch_search: true, elasticsearch_indexing: true)
+    end
+
+    where(:feature_flag, :tab_name) do
+      :global_search_code_tab           | 'Code'
+      :global_search_issues_tab         | 'Issues'
+      :global_search_merge_requests_tab | 'Merge requests'
+      :global_search_wiki_tab           | 'Wiki'
+      :global_search_commits_tab        | 'Commits'
+    end
+
+    with_them do
+      context 'global search' do
+        it 'shows the tab if FF is enabled' do
+          stub_feature_flags(feature_flag => true)
+
+          render
+
+          expect(rendered).to have_selector('.nav-tabs li', text: tab_name)
+        end
+
+        it 'hides the tab if FF is disabled' do
+          stub_feature_flags(feature_flag => false)
+
+          render
+
+          expect(rendered).not_to have_selector('.nav-tabs li', text: tab_name)
+        end
+      end
+
+      context 'group search' do
+        before do
+          assign(:group, group)
+        end
+
+        it 'shows the tab even if FF is disabled for group search' do
+          stub_feature_flags(feature_flag => false)
+
+          render
+
+          expect(rendered).to have_selector('.nav-tabs li', text: tab_name)
+        end
+      end
+    end
+  end
+end

locale/gitlab.pot

@@ -15485,6 +15485,9 @@ msgstr ""
 msgid "Given epic is already related to this epic."
 msgstr ""
 
+msgid "Global Search is disabled for this scope"
+msgstr ""
+
 msgid "Global Shortcuts"
 msgstr ""
 

spec/controllers/search_controller_spec.rb

@@ -182,6 +182,37 @@ RSpec.describe SearchController do
             end
           end
         end
+
+        context 'tab feature flags' do
+          subject { get :show, params: { scope: scope, search: 'term' }, format: :html }
+
+          where(:feature_flag, :scope) do
+            :global_search_code_tab           | 'blobs'
+            :global_search_issues_tab         | 'issues'
+            :global_search_merge_requests_tab | 'merge_requests'
+            :global_search_wiki_tab           | 'wiki_blobs'
+            :global_search_commits_tab        | 'commits'
+          end
+
+          with_them do
+            it 'returns 200 if flag is enabled' do
+              stub_feature_flags(feature_flag => true)
+
+              subject
+
+              expect(response).to have_gitlab_http_status(:ok)
+            end
+
+            it 'redirects with alert if flag is disabled' do
+              stub_feature_flags(feature_flag => false)
+
+              subject
+
+              expect(response).to redirect_to search_path
+              expect(controller).to set_flash[:alert].to(/Global Search is disabled for this scope/)
+            end
+          end
+        end
       end
 
       it 'finds issue comments' do