Add specs for Gitlab::RequestProfiler

Closes #31513

spec/features/admin/admin_requests_profiles_spec.rb

+require 'spec_helper'
+
+describe 'Admin::RequestsProfilesController', feature: true do
+  before do
+    FileUtils.mkdir_p(Gitlab::RequestProfiler::PROFILES_DIR)
+    login_as(:admin)
+  end
+
+  after do
+    Gitlab::RequestProfiler.remove_all_profiles
+  end
+
+  describe 'GET /admin/requests_profiles' do
+    it 'shows the current profile token' do
+      allow(Rails).to receive(:cache).and_return(ActiveSupport::Cache::MemoryStore.new)
+
+      visit admin_requests_profiles_path
+
+      expect(page).to have_content("X-Profile-Token: #{Gitlab::RequestProfiler.profile_token}")
+    end
+
+    it 'lists all available profiles' do
+      time1 = 1.hour.ago
+      time2 = 2.hours.ago
+      time3 = 3.hours.ago
+      profile1 = "|gitlab-org|gitlab-ce_#{time1.to_i}.html"
+      profile2 = "|gitlab-org|gitlab-ce_#{time2.to_i}.html"
+      profile3 = "|gitlab-com|infrastructure_#{time3.to_i}.html"
+
+      FileUtils.touch("#{Gitlab::RequestProfiler::PROFILES_DIR}/#{profile1}")
+      FileUtils.touch("#{Gitlab::RequestProfiler::PROFILES_DIR}/#{profile2}")
+      FileUtils.touch("#{Gitlab::RequestProfiler::PROFILES_DIR}/#{profile3}")
+
+      visit admin_requests_profiles_path
+
+      within('.panel', text: '/gitlab-org/gitlab-ce') do
+        expect(page).to have_selector("a[href='#{admin_requests_profile_path(profile1)}']", text: time1.to_s(:long))
+        expect(page).to have_selector("a[href='#{admin_requests_profile_path(profile2)}']", text: time2.to_s(:long))
+      end
+
+      within('.panel', text: '/gitlab-com/infrastructure') do
+        expect(page).to have_selector("a[href='#{admin_requests_profile_path(profile3)}']", text: time3.to_s(:long))
+      end
+    end
+  end
+
+  describe 'GET /admin/requests_profiles/:profile' do
+    context 'when a profile exists' do
+      it 'displays the content of the profile' do
+        content = 'This is a request profile'
+        profile = "|gitlab-org|gitlab-ce_#{Time.now.to_i}.html"
+
+        File.write("#{Gitlab::RequestProfiler::PROFILES_DIR}/#{profile}", content)
+
+        visit admin_requests_profile_path(profile)
+
+        expect(page).to have_content(content)
+      end
+    end
+
+    context 'when a profile does not exist' do
+      it 'shows an error message' do
+        visit admin_requests_profile_path('|non|existent_12345.html')
+
+        expect(page).to have_content('Profile not found')
+      end
+    end
+  end
+end

spec/lib/gitlab/request_profiler_spec.rb

+require 'spec_helper'
+
+describe Gitlab::RequestProfiler, lib: true do
+  describe '.profile_token' do
+    it 'returns a token' do
+      expect(described_class.profile_token).to be_present
+    end
+
+    it 'caches the token' do
+      expect(Rails.cache).to receive(:fetch).with('profile-token')
+
+      described_class.profile_token
+    end
+  end
+
+  describe '.remove_all_profiles' do
+    it 'removes Gitlab::RequestProfiler::PROFILES_DIR directory' do
+      dir = described_class::PROFILES_DIR
+      FileUtils.mkdir_p(dir)
+
+      expect(Dir.exist?(dir)).to be true
+
+      described_class.remove_all_profiles
+      expect(Dir.exist?(dir)).to be false
+    end
+  end
+end

spec/requests/request_profiler_spec.rb

+require 'spec_helper'
+
+describe 'Request Profiler' do
+  let(:user) { create(:user) }
+
+  shared_examples 'profiling a request' do
+    before do
+      allow(Rails).to receive(:cache).and_return(ActiveSupport::Cache::MemoryStore.new)
+      allow(RubyProf::Profile).to receive(:profile) do |&blk|
+        blk.call
+        RubyProf::Profile.new
+      end
+    end
+
+    it 'creates a profile of the request' do
+      project = create(:project, namespace: user.namespace)
+      time    = Time.now
+      path    = "/#{project.path_with_namespace}"
+
+      Timecop.freeze(time) do
+        get path, nil, 'X-Profile-Token' => Gitlab::RequestProfiler.profile_token
+      end
+
+      profile_path = "#{Gitlab.config.shared.path}/tmp/requests_profiles/#{path.tr('/', '|')}_#{time.to_i}.html"
+      expect(File.exist?(profile_path)).to be true
+    end
+
+    after do
+      Gitlab::RequestProfiler.remove_all_profiles
+    end
+  end
+
+  context "when user is logged-in" do
+    before do
+      login_as(user)
+    end
+
+    include_examples 'profiling a request'
+  end
+
+  context "when user is not logged-in" do
+    include_examples 'profiling a request'
+  end
+end