Remove user activities table and use redis instead of PG for recording activities

Refactored specs and added a post deployment migration to remove the activity users table.

app/models/user.rb

@@ -101,7 +101,6 @@ class User < ActiveRecord::Base
 
   has_many :assigned_issues,          dependent: :nullify, foreign_key: :assignee_id, class_name: "Issue"
   has_many :assigned_merge_requests,  dependent: :nullify, foreign_key: :assignee_id, class_name: "MergeRequest"
-  has_one :user_activity, dependent: :destroy
 
   # Issues that a user owns are expected to be moved to the "ghost" user before
   # the user is destroyed. If the user owns any issues during deletion, this
@@ -159,7 +158,6 @@ class User < ActiveRecord::Base
   alias_attribute :private_token, :authentication_token
 
   delegate :path, to: :namespace, allow_nil: true, prefix: true
-  delegate :last_activity_at, to: :user_activity, allow_nil: true
 
   state_machine :state, initial: :active do
     event :block do
@@ -951,6 +949,14 @@ class User < ActiveRecord::Base
     end
   end
 
+  def record_activity
+    Gitlab::Redis.with do |redis|
+      redis.zadd('user/activities', Time.now.to_i, self.username)
+    end
+  end
+
+  private
+
   def access_level=(new_level)
     new_level = new_level.to_s
     return unless %w(admin regular).include?(new_level)

app/models/user_activity.rb

-class UserActivity < ActiveRecord::Base
-  belongs_to :user, inverse_of: :user_activity
-
-  validates :user, uniqueness: true, presence: true
-  validates :last_activity_at, presence: true
-
-  # Updated version of http://apidock.com/rails/ActiveRecord/Timestamp/touch
-  # That accepts a new record.
-  def touch
-    current_time = current_time_from_proper_timezone
-
-    if persisted?
-      update_column(:last_activity_at, current_time)
-    else
-      self.last_activity_at = current_time
-      save!(validate: false)
-    end
-  end
-end

app/services/users/activity_service.rb

@@ -14,13 +14,9 @@ module Users
     private
 
     def record_activity
-      user_activity.touch
+      @author.record_activity
 
       Rails.logger.debug("Recorded activity: #{@activity} for User ID: #{@author.id} (username: #{@author.username}")
     end
-
-    def user_activity
-      UserActivity.find_or_initialize_by(user: @author)
-    end
   end
 end

db/post_migrate/20161128170531_drop_user_activities_table.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class DropUserActivitiesTable < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  # When using the methods "add_concurrent_index" or "add_column_with_default"
+  # you must disable the use of transactions as these methods can not run in an
+  # existing transaction. When using "add_concurrent_index" make sure that this
+  # method is the _only_ method called in the migration, any other changes
+  # should go in a separate migration. This ensures that upon failure _only_ the
+  # index creation fails and can be retried or reverted easily.
+  #
+  # To disable transactions uncomment the following line and remove these
+  # comments:
+  # disable_ddl_transaction!
+
+  def change
+    drop_table :user_activities
+  end
+end

db/schema.rb

@@ -1230,13 +1230,6 @@ ActiveRecord::Schema.define(version: 20170408033905) do
   add_index "uploads", ["model_id", "model_type"], name: "index_uploads_on_model_id_and_model_type", using: :btree
   add_index "uploads", ["path"], name: "index_uploads_on_path", using: :btree
 
-  create_table "user_activities", force: :cascade do |t|
-    t.integer "user_id"
-    t.datetime "last_activity_at", null: false
-  end
-
-  add_index "user_activities", ["user_id"], name: "index_user_activities_on_user_id", unique: true, using: :btree
-
   create_table "user_agent_details", force: :cascade do |t|
     t.string "user_agent", null: false
     t.string "ip_address", null: false
@@ -1396,5 +1389,4 @@ ActiveRecord::Schema.define(version: 20170408033905) do
   add_foreign_key "timelogs", "merge_requests", name: "fk_timelogs_merge_requests_merge_request_id", on_delete: :cascade
   add_foreign_key "trending_projects", "projects", on_delete: :cascade
   add_foreign_key "u2f_registrations", "users"
-  add_foreign_key "user_activities", "users", on_delete: :cascade
 end

lib/api/helpers/internal_helpers.rb

@@ -60,6 +60,13 @@ module API
       rescue JSON::ParserError
         {}
       end
+
+      def log_user_activity(actor)
+        commands = Gitlab::GitAccess::DOWNLOAD_COMMANDS +
+                   Gitlab::GitAccess::GIT_ANNEX_COMMANDS
+
+        ::Users::ActivityService.new(actor, 'Git SSH').execute if commands.include?(params[:action])
+      end
     end
   end
 end

spec/controllers/sessions_controller_spec.rb

@@ -16,7 +16,9 @@ describe SessionsController do
         end
       end
 
-      context 'when using valid password' do
+      context 'when using valid password', :redis do
+        include UserActivitiesHelpers
+
         let(:user) { create(:user) }
 
         it 'authenticates user correctly' do
@@ -41,7 +43,7 @@ describe SessionsController do
         it 'updates the user activity' do
           expect do
             post(:create, user: { login: user.username, password: user.password })
-          end.to change { user.reload.last_activity_at }.from(nil)
+          end.to change { user_score }.from(0)
         end
       end
     end

spec/factories/user_activities.rb

-FactoryGirl.define do
-  factory :user_activity do
-    last_activity_at { Time.now }
-    user
-  end
-end

spec/requests/api/internal_spec.rb

@@ -147,7 +147,9 @@ describe API::Internal, api: true  do
     end
   end
 
-  describe "POST /internal/allowed" do
+  describe "POST /internal/allowed", :redis do
+    include UserActivitiesHelpers
+
     context "access granted" do
       before do
         project.team << [user, :developer]
@@ -181,7 +183,7 @@ describe API::Internal, api: true  do
           expect(response).to have_http_status(200)
           expect(json_response["status"]).to be_truthy
           expect(json_response["repository_path"]).to eq(project.wiki.repository.path_to_repo)
-          expect(key.user.reload.last_activity_at.to_i).to eq(Time.now.to_i)
+          expect(user_score).to be_zero
         end
       end
 
@@ -192,7 +194,7 @@ describe API::Internal, api: true  do
           expect(response).to have_http_status(200)
           expect(json_response["status"]).to be_truthy
           expect(json_response["repository_path"]).to eq(project.wiki.repository.path_to_repo)
-          expect(key.user.reload.last_activity_at.to_i).to eq(Time.now.to_i)
+          expect(user_score).not_to be_zero
         end
       end
 
@@ -203,7 +205,7 @@ describe API::Internal, api: true  do
           expect(response).to have_http_status(200)
           expect(json_response["status"]).to be_truthy
           expect(json_response["repository_path"]).to eq(project.repository.path_to_repo)
-          expect(key.user.reload.last_activity_at.to_i).to eq(Time.now.to_i)
+          expect(user_score).not_to be_zero
         end
       end
 
@@ -214,7 +216,7 @@ describe API::Internal, api: true  do
           expect(response).to have_http_status(200)
           expect(json_response["status"]).to be_truthy
           expect(json_response["repository_path"]).to eq(project.repository.path_to_repo)
-          expect(key.user.reload.last_activity_at.to_i).to eq(Time.now.to_i)
+          expect(user_score).to be_zero
         end
 
         context 'project as /namespace/project' do
@@ -250,7 +252,7 @@ describe API::Internal, api: true  do
 
           expect(response).to have_http_status(200)
           expect(json_response["status"]).to be_falsey
-          expect(key.user.reload.last_activity_at).to be_nil
+          expect(user_score).to be_zero
         end
       end
 
@@ -260,7 +262,7 @@ describe API::Internal, api: true  do
 
           expect(response).to have_http_status(200)
           expect(json_response["status"]).to be_falsey
-          expect(key.user.reload.last_activity_at).to be_nil
+          expect(user_score).to be_zero
         end
       end
     end
@@ -278,7 +280,7 @@ describe API::Internal, api: true  do
 
           expect(response).to have_http_status(200)
           expect(json_response["status"]).to be_falsey
-          expect(key.user.reload.last_activity_at).to be_nil
+          expect(user_score).to be_zero
         end
       end
 
@@ -288,7 +290,7 @@ describe API::Internal, api: true  do
 
           expect(response).to have_http_status(200)
           expect(json_response["status"]).to be_falsey
-          expect(key.user.reload.last_activity_at).to be_nil
+          expect(user_score).to be_zero
         end
       end
     end

spec/services/event_create_service_spec.rb

 require 'spec_helper'
 
 describe EventCreateService, services: true do
+  include UserActivitiesHelpers
+
   let(:service) { EventCreateService.new }
 
   describe 'Issues' do
@@ -111,6 +113,19 @@ describe EventCreateService, services: true do
     end
   end
 
+  describe '#push', :redis do
+    let(:project) { create(:empty_project) }
+    let(:user) { create(:user) }
+
+    it 'creates a new event' do
+      expect { service.push(project, user, {}) }.to change { Event.count }
+    end
+
+    it 'updates user last activity' do
+      expect { service.push(project, user, {}) }.to change { user_score }
+    end
+  end
+
   describe 'Project' do
     let(:user) { create :user }
     let(:project) { create(:empty_project) }
@@ -129,17 +144,4 @@ describe EventCreateService, services: true do
       it { expect { subject }.to change { Event.count }.from(0).to(1) }
     end
   end
-
-  describe '#push' do
-    let(:project) { create(:empty_project) }
-    let(:user) { create(:user) }
-
-    it 'creates a new event' do
-      expect { service.push(project, user, {}) }.to change { Event.count }
-    end
-
-    it 'updates user last activity' do
-      expect { service.push(project, user, {}) }.to change { user.last_activity_at }
-    end
-  end
 end

spec/services/users/activity_service_spec.rb

 require 'spec_helper'
 
 describe Users::ActivityService, services: true do
+  include UserActivitiesHelpers
+
   let(:user) { create(:user) }
+
   subject(:service) { described_class.new(user, 'type') }
 
-  describe '#execute' do
+  describe '#execute', :redis do
     context 'when last activity is nil' do
-      it 'sets the last activity timestamp' do
+      before do
         service.execute
+      end
 
-        expect(user.last_activity_at).not_to be_nil
+      it 'sets the last activity timestamp for the user' do
+        expect(last_hour_members).to eq([user.username])
+      end
+
+      it 'updates the same user' do
+        service.execute
+
+        expect(last_hour_members).to eq([user.username])
+      end
+
+      it 'updates the timestamp of an existing user' do
+        Timecop.freeze(Date.tomorrow) do
+          expect { service.execute }.to change { user_score }.to(Time.now.to_i)
+        end
       end
-    end
 
-    context 'when activity_at is not nil' do
-      it 'updates the activity multiple times' do
-        activity = create(:user_activity, user: user)
+      describe 'other user' do
+        it 'updates other user' do
+          other_user = create(:user)
+          described_class.new(other_user, 'type').execute
 
-        Timecop.travel(activity.last_activity_at + 1.minute) do
-          expect { service.execute }.to change { user.reload.last_activity_at }
+          expect(last_hour_members).to match_array([user.username, other_user.username])
         end
       end
     end

spec/support/user_activities_helpers.rb

+module UserActivitiesHelpers
+  def last_hour_members
+    Gitlab::Redis.with do |redis|
+      redis.zrangebyscore(user_activities_key, 1.hour.ago.to_i, Time.now.to_i)
+    end
+  end
+
+  def user_score
+    Gitlab::Redis.with do |redis|
+      redis.zscore(user_activities_key, user.username).to_i
+    end
+  end
+
+  def user_activities_key
+    'user/activities'
+  end
+end