Expose cycle analytics summary via API

This change exposes the summary counts for group level cycle analytics
via a separate endpoint while making sure the old CA implementation is
still working.

ee/app/controllers/analytics/cycle_analytics/summary_controller.rb

+# frozen_string_literal: true
+
+module Analytics
+  module CycleAnalytics
+    class SummaryController < Analytics::ApplicationController
+      include CycleAnalyticsParams
+
+      check_feature_flag Gitlab::Analytics::CYCLE_ANALYTICS_FEATURE_FLAG
+
+      before_action :load_group
+      before_action :validate_params
+
+      def show
+        return render_403 unless can?(current_user, :read_group_cycle_analytics, @group)
+
+        group_level = ::CycleAnalytics::GroupLevel.new(group: @group, options: options(allowed_group_params))
+
+        render json: group_level.summary
+      end
+
+      private
+
+      def allowed_group_params
+        params.permit(:created_after, :created_before, project_ids: [])
+      end
+
+      def validate_params
+        if request_params.invalid?
+          render(
+            json: { message: 'Invalid parameters', errors: request_params.errors },
+            status: :unprocessable_entity
+          )
+        end
+      end
+
+      def request_params
+        @request_params ||= Gitlab::Analytics::CycleAnalytics::RequestParams.new(params.permit(:created_before, :created_after))
+      end
+    end
+  end
+end

ee/config/routes/analytics.rb

@@ -14,6 +14,7 @@ namespace :analytics do
           get :records
         end
       end
+      resource :summary, controller: :summary, only: [:show]
     end
   end
 

ee/spec/controllers/analytics/cycle_analytics/stages_controller_spec.rb

@@ -187,18 +187,7 @@ describe Analytics::CycleAnalytics::StagesController do
         expect(response).to match_response_schema('analytics/cycle_analytics/median', dir: 'ee')
       end
 
-      context 'when params are invalid' do
-        before do
-          params[:created_before] = '2018-01-01'
-        end
-
-        it 'renders `unprocessable_entity`' do
-          subject
-
-          expect(response).to have_gitlab_http_status(:unprocessable_entity)
-          expect(response).to match_response_schema('analytics/cycle_analytics/validation_error', dir: 'ee')
-        end
-      end
+      include_examples 'date parameter examples'
 
       include_examples 'group permission check on the controller level'
     end
@@ -217,6 +206,8 @@ describe Analytics::CycleAnalytics::StagesController do
         expect(response).to be_successful
       end
 
+      include_examples 'date parameter examples'
+
       include_examples 'group permission check on the controller level'
     end
   end

ee/spec/controllers/analytics/cycle_analytics/summary_controller_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Analytics::CycleAnalytics::SummaryController do
+  let_it_be(:user) { create(:user) }
+  let_it_be(:group, refind: true) { create(:group) }
+  let(:params) { { group_id: group.full_path, created_after: '2010-01-01', created_before: '2010-01-02' } }
+
+  before do
+    stub_feature_flags(Gitlab::Analytics::CYCLE_ANALYTICS_FEATURE_FLAG => true)
+    stub_licensed_features(cycle_analytics_for_groups: true)
+
+    group.add_reporter(user)
+    sign_in(user)
+  end
+
+  describe 'GET `show`' do
+    subject { get :show, params: params }
+
+    it 'succeeds' do
+      subject
+
+      expect(response).to be_successful
+      expect(response).to match_response_schema('analytics/cycle_analytics/summary', dir: 'ee')
+    end
+
+    include_examples 'date parameter examples'
+
+    include_examples 'group permission check on the controller level'
+  end
+end

ee/spec/fixtures/api/schemas/analytics/cycle_analytics/summary.json

+{
+  "type": "array",
+  "items": {
+    "minItems": 2,
+    "maxItems": 2,
+    "type": "object",
+    "required": ["value", "title"],
+    "properties": {
+      "value": {
+        "type": "integer"
+      },
+      "title": {
+        "type": "string"
+      }
+    },
+    "additionalProperties": false
+  }
+}

ee/spec/support/shared_examples/controllers/analytics/cycle_analytics/shared_stage_examples.rb

@@ -77,3 +77,68 @@ shared_context 'when invalid stage parameters are given' do
     expect(response).to match_response_schema('analytics/cycle_analytics/validation_error', dir: 'ee')
   end
 end
+
+shared_examples 'date parameter examples' do
+  before do
+    params[:created_after] = '2019-01-01'
+    params[:created_before] = '2020-01-01'
+  end
+
+  context 'when valid parameters are given' do
+    it 'succeeds' do
+      subject
+
+      expect(response).to be_successful
+    end
+  end
+
+  shared_examples 'example for invalid parameter' do
+    it 'renders `unprocessable_entity`' do
+      subject
+
+      expect(response).to have_gitlab_http_status(:unprocessable_entity)
+      expect(response).to match_response_schema('analytics/cycle_analytics/validation_error', dir: 'ee')
+    end
+  end
+
+  context 'when `created_after` is missing' do
+    before do
+      params.delete(:created_after)
+    end
+
+    include_examples 'example for invalid parameter'
+  end
+
+  context 'when `created_after` is invalid' do
+    before do
+      params[:created_after] = 'not-a-date'
+    end
+
+    include_examples 'example for invalid parameter'
+  end
+
+  context 'when `created_before` is missing' do
+    before do
+      params.delete(:created_before)
+    end
+
+    include_examples 'example for invalid parameter'
+  end
+
+  context 'when `created_after` is invalid' do
+    before do
+      params[:created_before] = 'not-a-date'
+    end
+
+    include_examples 'example for invalid parameter'
+  end
+
+  context 'when `created_after` is later than `created_before`' do
+    before do
+      params[:created_after] = '2012-01-01'
+      params[:created_before] = '2010-01-01'
+    end
+
+    include_examples 'example for invalid parameter'
+  end
+end

lib/gitlab/cycle_analytics/group_stage_summary.rb

@@ -3,18 +3,17 @@
 module Gitlab
   module CycleAnalytics
     class GroupStageSummary
-      attr_reader :group, :from, :current_user, :options
+      attr_reader :group, :current_user, :options
 
       def initialize(group, options:)
         @group = group
-        @from = options[:from]
         @current_user = options[:current_user]
         @options = options
       end
 
       def data
-        [serialize(Summary::Group::Issue.new(group: group, from: from, current_user: current_user, options: options)),
-         serialize(Summary::Group::Deploy.new(group: group, from: from, options: options))]
+        [serialize(Summary::Group::Issue.new(group: group, current_user: current_user, options: options)),
+         serialize(Summary::Group::Deploy.new(group: group, options: options))]
       end
 
       private

lib/gitlab/cycle_analytics/summary/group/base.rb

@@ -5,11 +5,10 @@ module Gitlab
     module Summary
       module Group
         class Base
-          attr_reader :group, :from, :options
+          attr_reader :group, :options
 
-          def initialize(group:, from:, options:)
+          def initialize(group:, options:)
             @group = group
-            @from = from
             @options = options
           end
 

lib/gitlab/cycle_analytics/summary/group/deploy.rb

@@ -20,7 +20,8 @@ module Gitlab
           def find_deployments
             deployments = Deployment.joins(:project).merge(Project.inside_path(group.full_path))
             deployments = deployments.where(projects: { id: options[:projects] }) if options[:projects]
-            deployments = deployments.where("deployments.created_at > ?", from)
+            deployments = deployments.where("deployments.created_at > ?", options[:from])
+            deployments = deployments.where("deployments.created_at < ?", options[:to]) if options[:to]
             deployments.success.count
           end
         end

lib/gitlab/cycle_analytics/summary/group/issue.rb

@@ -5,11 +5,10 @@ module Gitlab
     module Summary
       module Group
         class Issue < Group::Base
-          attr_reader :group, :from, :current_user, :options
+          attr_reader :group, :current_user, :options
 
-          def initialize(group:, from:, current_user:, options:)
+          def initialize(group:, current_user:, options:)
             @group = group
-            @from = from
             @current_user = current_user
             @options = options
           end
@@ -25,10 +24,19 @@ module Gitlab
           private
 
           def find_issues
-            issues = IssuesFinder.new(current_user, group_id: group.id, include_subgroups: true, created_after: from).execute
+            issues = IssuesFinder.new(current_user, finder_params).execute
             issues = issues.where(projects: { id: options[:projects] }) if options[:projects]
             issues.count
           end
+
+          def finder_params
+            {
+              group_id: group.id,
+              include_subgroups: true,
+              created_after: options[:from],
+              created_before: options[:to]
+            }.compact
+          end
         end
       end
     end

spec/lib/gitlab/cycle_analytics/group_stage_summary_spec.rb

@@ -44,6 +44,14 @@ describe Gitlab::CycleAnalytics::GroupStageSummary do
           expect(subject.first[:value]).to eq(2)
         end
       end
+
+      context 'when `from` and `to` parameters are provided' do
+        subject { described_class.new(group, options: { from: 10.days.ago, to: Time.now, current_user: user }).data }
+
+        it 'finds issues from 5 days ago' do
+          expect(subject.first[:value]).to eq(2)
+        end
+      end
     end
 
     context 'with other projects' do
@@ -97,6 +105,14 @@ describe Gitlab::CycleAnalytics::GroupStageSummary do
           expect(subject.second[:value]).to eq(2)
         end
       end
+
+      context 'when `from` and `to` parameters are provided' do
+        subject { described_class.new(group, options: { from: 10.days.ago, to: Time.now, current_user: user }).data }
+
+        it 'finds deployments from 5 days ago' do
+          expect(subject.second[:value]).to eq(2)
+        end
+      end
     end
 
     context 'with other projects' do