Implement endpoints for code coverage graph

Adds an endpoint that will be used by the daily code coverage graph.

app/controllers/projects/ci/daily_build_group_report_results_controller.rb

@@ -12,7 +12,8 @@ class Projects::Ci::DailyBuildGroupReportResultsController < Projects::Applicati
 
   def index
     respond_to do |format|
-      format.csv { send_data(render_csv(results), type: 'text/csv; charset=utf-8') }
+      format.csv { send_data(render_csv(report_results), type: 'text/csv; charset=utf-8') }
+      format.json { render json: render_json(report_results) }
     end
   end
 
@@ -37,7 +38,11 @@ class Projects::Ci::DailyBuildGroupReportResultsController < Projects::Applicati
     ).render
   end
 
-  def results
+  def render_json(collection)
+    Ci::DailyBuildGroupReportResultSerializer.new.represent(collection, param_type: param_type)
+  end
+
+  def report_results
     Ci::DailyBuildGroupReportResultsFinder.new(finder_params).execute
   end
 

app/controllers/projects/graphs_controller.rb

@@ -71,6 +71,11 @@ class Projects::GraphsController < Projects::ApplicationController
         namespace_id: @project.namespace,
         project_id: @project,
         format: :csv
+      ),
+      graph_api_path: namespace_project_ci_daily_build_group_report_results_path(
+        namespace_id: @project.namespace,
+        project_id: @project,
+        format: :json
       )
     }
   end

app/finders/ci/daily_build_group_report_results_finder.rb

@@ -17,18 +17,22 @@ module Ci
       return none unless can?(current_user, :read_build_report_results, project)
 
       Ci::DailyBuildGroupReportResult.recent_results(
-        {
-          project_id: project,
-          ref_path: ref_path,
-          date: start_date..end_date
-        },
-        limit: @limit
+        query_params,
+        limit: limit
       )
     end
 
     private
 
-    attr_reader :current_user, :project, :ref_path, :start_date, :end_date
+    attr_reader :current_user, :project, :ref_path, :start_date, :end_date, :limit
+
+    def query_params
+      {
+        project_id: project,
+        ref_path: ref_path,
+        date: start_date..end_date
+      }
+    end
 
     def none
       Ci::DailyBuildGroupReportResult.none

app/serializers/ci/daily_build_group_report_result_entity.rb

+# frozen_string_literal: true
+
+module Ci
+  class DailyBuildGroupReportResultEntity < Grape::Entity
+    expose :date
+
+    ::Ci::DailyBuildGroupReportResult::PARAM_TYPES.each do |type|
+      expose type, if: lambda { |report_result, options| options[:param_type] == type } do |report_result, options|
+        report_result.data[options[:param_type]]
+      end
+    end
+  end
+end

app/serializers/ci/daily_build_group_report_result_serializer.rb

+# frozen_string_literal: true
+
+module Ci
+  class DailyBuildGroupReportResultSerializer < BaseSerializer
+    entity ::Ci::DailyBuildGroupReportResultEntity
+
+    def represent(resource, opts = {})
+      group(resource).map do |group_name, data|
+        {
+          group_name: group_name,
+          data: super(data, opts)
+        }
+      end
+    end
+
+    private
+
+    def group(resource)
+      collect(resource).group_by(&:group_name)
+    end
+
+    def collect(resource)
+      return resource if resource.respond_to?(:group_by)
+
+      [resource]
+    end
+  end
+end

config/routes/project.rb

@@ -67,7 +67,7 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
 
         namespace :ci do
           resource :lint, only: [:show, :create]
-          resources :daily_build_group_report_results, only: [:index], constraints: { format: 'csv' }
+          resources :daily_build_group_report_results, only: [:index], constraints: { format: /(csv|json)/ }
         end
 
         namespace :settings do

spec/controllers/projects/ci/daily_build_group_report_results_controller_spec.rb

@@ -14,9 +14,10 @@ RSpec.describe Projects::Ci::DailyBuildGroupReportResultsController do
 
     before do
       create_daily_coverage('rspec', 79.0, '2020-03-09')
+      create_daily_coverage('rspec', 77.0, '2020-03-08')
       create_daily_coverage('karma', 81.0, '2019-12-10')
-      create_daily_coverage('rspec', 67.0, '2019-12-09')
-      create_daily_coverage('karma', 71.0, '2019-12-09')
+      create_daily_coverage('minitest', 67.0, '2019-12-09')
+      create_daily_coverage('mocha', 71.0, '2019-12-09')
 
       sign_in(user)
 
@@ -30,10 +31,33 @@ RSpec.describe Projects::Ci::DailyBuildGroupReportResultsController do
         param_type: param_type,
         start_date: start_date,
         end_date: end_date,
-        format: :csv
+        format: format
       }
     end
 
+    shared_examples_for 'validating param_type' do
+      context 'when given param_type is invalid' do
+        let(:param_type) { 'something_else' }
+
+        it 'responds with 422 error' do
+          expect(response).to have_gitlab_http_status(:unprocessable_entity)
+        end
+      end
+    end
+
+    shared_examples_for 'ensuring policy' do
+      context 'when user is not allowed to read build report results' do
+        let(:allowed_to_read) { false }
+
+        it 'responds with 404 error' do
+          expect(response).to have_gitlab_http_status(:not_found)
+        end
+      end
+    end
+
+    context 'when format is CSV' do
+      let(:format) { :csv }
+
       it 'serves the results in CSV' do
         expect(response).to have_gitlab_http_status(:ok)
         expect(response.headers['Content-Type']).to eq('text/csv; charset=utf-8')
@@ -41,6 +65,7 @@ RSpec.describe Projects::Ci::DailyBuildGroupReportResultsController do
         expect(csv_response).to eq([
           %w[date group_name coverage],
           ['2020-03-09', 'rspec', '79.0'],
+          ['2020-03-08', 'rspec', '77.0'],
           ['2019-12-10', 'karma', '81.0']
         ])
       end
@@ -50,32 +75,68 @@ RSpec.describe Projects::Ci::DailyBuildGroupReportResultsController do
         let(:end_date) { '2020-03-09' }
 
         it 'limits the result to 90 days from the given start_date' do
-        expect(response).to have_gitlab_http_status(:ok)
-        expect(response.headers['Content-Type']).to eq('text/csv; charset=utf-8')
-
           expect(csv_response).to eq([
             %w[date group_name coverage],
             ['2020-03-09', 'rspec', '79.0'],
+            ['2020-03-08', 'rspec', '77.0'],
             ['2019-12-10', 'karma', '81.0']
           ])
         end
       end
 
-    context 'when given param_type is invalid' do
-      let(:param_type) { 'something_else' }
-
-      it 'responds with 422 error' do
-        expect(response).to have_gitlab_http_status(:unprocessable_entity)
+      it_behaves_like 'validating param_type'
+      it_behaves_like 'ensuring policy'
     end
+
+    context 'when format is JSON' do
+      let(:format) { :json }
+
+      it 'serves the results in JSON' do
+        expect(response).to have_gitlab_http_status(:ok)
+
+        expect(json_response).to eq([
+          {
+            'group_name' => 'rspec',
+            'data' => [
+              { 'date' => '2020-03-09', 'coverage' => 79.0 },
+              { 'date' => '2020-03-08', 'coverage' => 77.0 }
+            ]
+          },
+          {
+            'group_name' => 'karma',
+            'data' => [
+              { 'date' => '2019-12-10', 'coverage' => 81.0 }
+            ]
+          }
+        ])
       end
 
-    context 'when user is not allowed to read build report results' do
-      let(:allowed_to_read) { false }
+      context 'when given date range spans more than 90 days' do
+        let(:start_date) { '2019-12-09' }
+        let(:end_date) { '2020-03-09' }
 
-      it 'responds with 404 error' do
-        expect(response).to have_gitlab_http_status(:not_found)
+        it 'limits the result to 90 days from the given start_date' do
+          expect(json_response).to eq([
+            {
+              'group_name' => 'rspec',
+              'data' => [
+                { 'date' => '2020-03-09', 'coverage' => 79.0 },
+                { 'date' => '2020-03-08', 'coverage' => 77.0 }
+              ]
+            },
+            {
+              'group_name' => 'karma',
+              'data' => [
+                { 'date' => '2019-12-10', 'coverage' => 81.0 }
+              ]
+            }
+          ])
         end
       end
+
+      it_behaves_like 'validating param_type'
+      it_behaves_like 'ensuring policy'
+    end
   end
 
   def create_daily_coverage(group_name, coverage, date)

spec/controllers/projects/graphs_controller_spec.rb

@@ -49,8 +49,8 @@ RSpec.describe Projects::GraphsController do
 
             expect(assigns[:daily_coverage_options]).to eq(
               base_params: {
-                start_date: Time.current.to_date - 90.days,
-                end_date: Time.current.to_date,
+                start_date: Date.current - 90.days,
+                end_date: Date.current,
                 ref_path: project.repository.expand_ref('master'),
                 param_type: 'coverage'
               },
@@ -58,6 +58,11 @@ RSpec.describe Projects::GraphsController do
                 namespace_id: project.namespace,
                 project_id: project,
                 format: :csv
+              ),
+              graph_api_path: namespace_project_ci_daily_build_group_report_results_path(
+                namespace_id: project.namespace,
+                project_id: project,
+                format: :json
               )
             )
           end

spec/serializers/ci/daily_build_group_report_result_entity_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Ci::DailyBuildGroupReportResultEntity do
+  let(:report_result) { double(date: '2020-05-20', group_name: 'rspec', data: { 'coverage' => 79.1 }) }
+  let(:entity) { described_class.new(report_result, param_type: param_type) }
+  let(:param_type) { 'coverage' }
+
+  describe '#as_json' do
+    subject { entity.as_json }
+
+    it { is_expected.to include(:date) }
+
+    it { is_expected.not_to include(:group_name) }
+
+    it { is_expected.to include(:coverage) }
+
+    context 'when given param_type is not allowed' do
+      let(:param_type) { 'something_else' }
+
+      it { is_expected.not_to include(:coverage) }
+      it { is_expected.not_to include(:something_else) }
+    end
+  end
+end

spec/serializers/ci/daily_build_group_report_result_serializer_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Ci::DailyBuildGroupReportResultSerializer do
+  let(:report_result) do
+    [
+      double(date: '2020-05-20', group_name: 'rspec', data: { 'coverage' => 79.1 }),
+      double(date: '2020-05-20', group_name: 'karma', data: { 'coverage' => 90.1 }),
+      double(date: '2020-05-19', group_name: 'rspec', data: { 'coverage' => 77.1 }),
+      double(date: '2020-05-19', group_name: 'karma', data: { 'coverage' => 89.1 })
+    ]
+  end
+  let(:serializer) { described_class.new.represent(report_result, param_type: 'coverage') }
+
+  describe '#to_json' do
+    let(:json) { Gitlab::Json.parse(serializer.to_json) }
+
+    it 'returns an array of group results' do
+      expect(json).to eq([
+        {
+          'group_name' => 'rspec',
+          'data' => [
+            { 'date' => '2020-05-20', 'coverage' => 79.1 },
+            { 'date' => '2020-05-19', 'coverage' => 77.1 }
+          ]
+        },
+        {
+          'group_name' => 'karma',
+          'data' => [
+            { 'date' => '2020-05-20', 'coverage' => 90.1 },
+            { 'date' => '2020-05-19', 'coverage' => 89.1 }
+          ]
+        }
+      ])
+    end
+  end
+end