Data endpoint for tasks by type chart

This change introduces a new API endpoint for task by type chart within
the analytics workspace.

ee/app/controllers/analytics/application_controller.rb

@@ -15,7 +15,7 @@ class Analytics::ApplicationController < ApplicationController
     before_action(*args) { counter_klass.count(counter) }
   end
 
-  def authorize_view_productivity_analytics!(action)
+  def authorize_view_by_action!(action)
     return render_403 unless can?(current_user, action, @group || :global)
   end
 

ee/app/controllers/analytics/productivity_analytics_controller.rb

@@ -11,7 +11,7 @@ class Analytics::ProductivityAnalyticsController < Analytics::ApplicationControl
     check_feature_availability!(:productivity_analytics)
   }
   before_action -> {
-    authorize_view_productivity_analytics!(:view_productivity_analytics)
+    authorize_view_by_action!(:view_productivity_analytics)
   }
   before_action -> {
     push_frontend_feature_flag(:productivity_analytics_scatterplot_enabled, default_enabled: true)

ee/app/controllers/analytics/tasks_by_type_controller.rb

+# frozen_string_literal: true
+
+class Analytics::TasksByTypeController < Analytics::ApplicationController
+  check_feature_flag Gitlab::Analytics::TASKS_BY_TYPE_CHART_FEATURE_FLAG
+
+  before_action :load_group
+  before_action -> { check_feature_availability!(:type_of_work_analytics) }
+  before_action -> { authorize_view_by_action!(:view_type_of_work_charts) }
+  before_action :validate_label_ids
+  before_action :prepare_date_range
+
+  # Mocked data, this will be replaced with real implementation
+  class TasksByType
+    LabelCountResult = Struct.new(:label, :series)
+
+    def counts_by_labels
+      [
+        LabelCountResult.new(GroupLabel.new(id: 1, title: 'label 1'), [
+          ["2018-01-01", 23],
+          ["2018-01-02", 5]
+        ]),
+        LabelCountResult.new(GroupLabel.new(id: 2, title: 'label 3'), [
+          ["2018-01-01", 3],
+          ["2018-01-03", 10]
+        ])
+      ]
+    end
+  end
+
+  def show
+    render json: Analytics::TasksByTypeLabelEntity.represent(counts_by_labels)
+  end
+
+  private
+
+  def counts_by_labels
+    TasksByType.new.counts_by_labels
+  end
+
+  def validate_label_ids
+    return respond_422 if Array(params[:label_ids]).empty?
+  end
+
+  def prepare_date_range
+    @created_after = parse_date(params[:created_after])
+    return respond_422 unless @created_after
+
+    @created_before = parse_date(params[:created_before]) || Date.today
+
+    return respond_422 if @created_after > @created_before
+  end
+
+  def parse_date(value)
+    return unless value
+
+    Date.parse(value)
+  rescue ArgumentError
+  end
+end

ee/app/models/license.rb

@@ -92,6 +92,7 @@ class License < ApplicationRecord
     scoped_labels
     service_desk
     smartcard_auth
+    type_of_work_analytics
     unprotection_restrictions
   ]
   EEP_FEATURES.freeze

ee/app/policies/ee/group_policy.rb

@@ -51,6 +51,7 @@ module EE
         enable :read_prometheus
         enable :view_code_analytics
         enable :view_productivity_analytics
+        enable :view_type_of_work_charts
       end
 
       rule { maintainer }.policy do

ee/app/serializers/analytics/tasks_by_type_label_entity.rb

+# frozen_string_literal: true
+
+module Analytics
+  class TasksByTypeLabelEntity < Grape::Entity
+    expose :label, with: LabelEntity
+    expose :series
+  end
+end

ee/config/routes/analytics.rb

@@ -13,4 +13,10 @@ namespace :analytics do
       resources :stages, only: [:index]
     end
   end
+
+  constraints(::Constraints::FeatureConstrainer.new(Gitlab::Analytics::TASKS_BY_TYPE_CHART_FEATURE_FLAG)) do
+    scope :type_of_work do
+      resource :tasks_by_type, controller: :tasks_by_type, only: :show
+    end
+  end
 end

ee/lib/gitlab/analytics.rb

@@ -5,10 +5,12 @@ module Gitlab
     # Normally each analytics feature should be guarded with a feature flag.
     CYCLE_ANALYTICS_FEATURE_FLAG = :cycle_analytics
     PRODUCTIVITY_ANALYTICS_FEATURE_FLAG = :productivity_analytics
+    TASKS_BY_TYPE_CHART_FEATURE_FLAG = :tasks_by_type_chart
 
     FEATURE_FLAGS = [
       CYCLE_ANALYTICS_FEATURE_FLAG,
-      PRODUCTIVITY_ANALYTICS_FEATURE_FLAG
+      PRODUCTIVITY_ANALYTICS_FEATURE_FLAG,
+      TASKS_BY_TYPE_CHART_FEATURE_FLAG
     ].freeze
 
     def self.any_features_enabled?

ee/spec/controllers/analytics/tasks_by_type_controller_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Analytics::TasksByTypeController do
+  let(:user) { create(:user) }
+  let(:group) { create(:group) }
+  let(:params) { { group_id: group.full_path, label_ids: [1, 2], created_after: '2018-01-01' } }
+  let(:subject) { get :show, params: params }
+
+  before do
+    stub_licensed_features(type_of_work_analytics: true)
+    stub_feature_flags(Gitlab::Analytics::TASKS_BY_TYPE_CHART_FEATURE_FLAG => true)
+
+    group.add_reporter(user)
+
+    sign_in(user)
+  end
+
+  it 'succeeds' do
+    subject
+
+    expect(response).to be_successful
+    expect(response).to match_response_schema('analytics/tasks_by_type', dir: 'ee')
+  end
+
+  context 'when user access level is lower than reporter' do
+    before do
+      group.add_guest(user)
+    end
+
+    it do
+      subject
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+    end
+  end
+
+  context 'when license is missing' do
+    before do
+      stub_licensed_features(type_of_work_analytics: false)
+    end
+
+    it 'returns forbidden as response' do
+      subject
+
+      expect(response).to have_gitlab_http_status(:forbidden)
+    end
+  end
+
+  context 'when feature flag is disabled' do
+    before do
+      stub_feature_flags(Gitlab::Analytics::TASKS_BY_TYPE_CHART_FEATURE_FLAG => false)
+    end
+
+    it 'returns not_found as response' do
+      subject
+
+      expect(response).to have_gitlab_http_status(:not_found)
+    end
+  end
+
+  shared_examples 'expects unprocessable_entity response' do
+    it 'returns unprocessable_entity as resposne' do
+      subject
+
+      expect(response).to have_gitlab_http_status(:unprocessable_entity)
+    end
+  end
+
+  context 'when `label_id` is missing' do
+    before do
+      params.delete(:label_ids)
+    end
+
+    it_behaves_like 'expects unprocessable_entity response'
+  end
+
+  context 'when `created_after` parameter is invalid' do
+    before do
+      params[:created_after] = 'invalid_date'
+    end
+
+    it_behaves_like 'expects unprocessable_entity response'
+  end
+
+  context 'when `created_after` parameter is missing' do
+    before do
+      params.delete(:created_after)
+    end
+
+    it_behaves_like 'expects unprocessable_entity response'
+  end
+
+  context 'when `created_after` date is later than "created_before" date' do
+    before do
+      params[:created_after] = 1.year.ago.to_date
+      params[:created_before] = 2.years.ago.to_date
+    end
+
+    it_behaves_like 'expects unprocessable_entity response'
+  end
+end

ee/spec/fixtures/api/schemas/analytics/tasks_by_type.json

+{
+  "type": "array",
+  "items": {
+    "type": "object" ,
+    "additionalProperties": false,
+    "properties": {
+      "label": {
+        "type": "object",
+        "properties": {
+          "id": {
+            "type": "integer"
+          },
+          "title": {
+            "type": "string"
+          },
+          "color": {
+            "type": "string"
+          },
+          "text_color": {
+            "type": "string"
+          }
+        }
+      },
+      "series": {
+        "type": "array",
+        "items": [
+          {
+            "type": "array",
+            "minItems": 2,
+            "maxItems": 2,
+            "items": [
+              {
+                "description": "Creation date represented as string with ISO 8601 date format (YYYY-MM-DD).",
+                "type": "string"
+              },
+              {
+                "description": "Number of issues or merge requests created at the given date.",
+                "type": "integer"
+              }
+            ]
+          }
+        ]
+      }
+    }
+  }
+}

ee/spec/policies/group_policy_spec.rb

@@ -437,4 +437,8 @@ describe GroupPolicy do
   describe 'view_productivity_analytics' do
     include_examples 'analytics policy', :view_productivity_analytics
   end
+
+  describe 'view_type_of_work_charts' do
+    include_examples 'analytics policy', :view_type_of_work_charts
+  end
 end