Add product analytics event model

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/models/product_analytics_event.rb

+# frozen_string_literal: true
+
+class ProductAnalyticsEvent < ApplicationRecord
+  self.table_name = 'product_analytics_events_experimental'
+
+  # Ignore that the partition key :project_id is part of the formal primary key
+  self.primary_key = :id
+
+  belongs_to :project
+
+  # There is no default Rails timestamps in the table.
+  # collector_tstamp is a timestamp when a collector recorded an event.
+  scope :order_by_time, -> { order(collector_tstamp: :desc) }
+
+  # If we decide to change this scope to use date_trunc('day', collector_tstamp),
+  # we should remember that a btree index on collector_tstamp will be no longer effective.
+  scope :timerange, ->(duration, today = Time.zone.today) {
+    where('collector_tstamp BETWEEN ? AND ? ', today - duration + 1, today + 1)
+  }
+end

db/fixtures/development/27_product_analytics_events.rb

+# frozen_string_literal: true
+
+Gitlab::Seeder.quiet do
+  # The data set takes approximately 2 minutes to load,
+  # so its put behind the flag. To seed this data use the flag and the filter:
+  # SEED_PRODUCT_ANALYTICS_EVENTS=1 FILTER=product_analytics_events rake db:seed_fu
+  flag = 'SEED_PRODUCT_ANALYTICS_EVENTS'
+
+  if ENV[flag]
+    Project.all.sample(2).each do |project|
+      # Let's generate approx a week of events from now into the past with 1 minute step.
+      # To add some differentiation we add a random offset of up to 45 seconds.
+      10000.times do |i|
+        dvce_created_tstamp = DateTime.now - i.minute - rand(45).seconds
+
+        # Add a random delay to collector timestamp. Up to 2 seconds.
+        collector_tstamp = dvce_created_tstamp + rand(3).second
+
+        ProductAnalyticsEvent.create!(
+          project_id: project.id,
+          platform: ["web", "mob", "mob", "app"].sample,
+          collector_tstamp: collector_tstamp,
+          dvce_created_tstamp: dvce_created_tstamp,
+          event: nil,
+          event_id: SecureRandom.uuid,
+          name_tracker: "sp",
+          v_tracker: "js-2.14.0",
+          v_collector: Gitlab::VERSION,
+          v_etl: Gitlab::VERSION,
+          domain_userid: SecureRandom.uuid,
+          domain_sessionidx: 4,
+          page_url: "#{project.web_url}/-/product_analytics/test",
+          page_title: 'Test page',
+          page_referrer: "#{project.web_url}/-/product_analytics/test",
+          br_lang: ["en-US", "en-US", "en-GB", "nl", "fi"].sample, # https://www.andiamo.co.uk/resources/iso-language-codes/
+          br_features_pdf: true,
+          br_cookies: [true, true, true, false].sample,
+          br_colordepth: ["24", "24", "16", "8"].sample,
+          os_timezone: ["America/Los_Angeles", "America/Los_Angeles", "America/Lima", "Asia/Dubai", "Africa/Bangui"].sample, # https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+          doc_charset: ["UTF-8", "UTF-8", "UTF-8", "DOS", "EUC"].sample,
+          domain_sessionid: SecureRandom.uuid
+        )
+      end
+
+      unless Feature.enabled?(:product_analytics, project)
+        if Feature.enable(:product_analytics, project)
+          puts "Product analytics feature was enabled for #{project.full_path}"
+        end
+      end
+
+      puts "10K events added to #{project.full_path}"
+    end
+  else
+    puts "Skipped. Use the `#{flag}` environment variable to enable."
+  end
+end

spec/factories/product_analytics_event.rb

+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :product_analytics_event do
+    project
+    platform { 'web' }
+    collector_tstamp { DateTime.now }
+    dvce_created_tstamp { DateTime.now }
+    event_id { SecureRandom.uuid }
+    name_tracker { 'sp' }
+    v_tracker { 'js-2.14.0' }
+    v_collector { 'GitLab 13.1.0-pre' }
+    v_etl { 'GitLab 13.1.0-pre' }
+    domain_userid { SecureRandom.uuid }
+    domain_sessionidx { 4 }
+    page_url { 'http://localhost:3333/products/123' }
+    br_lang { 'en-US' }
+    br_cookies { true }
+    br_colordepth { '24' }
+    os_timezone { 'America/Los_Angeles' }
+    doc_charset { 'UTF-8' }
+    domain_sessionid { SecureRandom.uuid }
+  end
+end

spec/models/product_analytics_event_spec.rb

+# frozen_string_literal: true
+require 'spec_helper'
+
+RSpec.describe ProductAnalyticsEvent, type: :model do
+  it { is_expected.to belong_to(:project) }
+  it { expect(described_class).to respond_to(:order_by_time) }
+
+  describe '.timerange' do
+    let_it_be(:event_1) { create(:product_analytics_event, collector_tstamp: Time.zone.now - 1.day) }
+    let_it_be(:event_2) { create(:product_analytics_event, collector_tstamp: Time.zone.now - 5.days) }
+    let_it_be(:event_3) { create(:product_analytics_event, collector_tstamp: Time.zone.now - 15.days) }
+
+    it { expect(described_class.timerange(3.days)).to match_array([event_1]) }
+    it { expect(described_class.timerange(7.days)).to match_array([event_1, event_2]) }
+    it { expect(described_class.timerange(30.days)).to match_array([event_1, event_2, event_3]) }
+  end
+end