Clear some fields from Cron workers

Cron workers, regardless from how they are schedules, can't have a
context pointing to a user, project or a namespace. Since they don't
run with arguments, they are never scoped to a single resource.

So clear the context, to make sure that every job that gets scheduled
from within a cron worker doesn't inherit it's context.

This also adds a `with_context` helper to the workers to facilitate
scheduling a context for workers that are spun off from a cron worker.

app/controllers/import/base_controller.rb

@@ -7,14 +7,14 @@ class Import::BaseController < ApplicationController
 
   # rubocop: disable CodeReuse/ActiveRecord
   def find_already_added_projects(import_type)
-    current_user.created_projects.where(import_type: import_type).includes(:import_state)
+    current_user.created_projects.where(import_type: import_type).with_import_state
   end
   # rubocop: enable CodeReuse/ActiveRecord
 
   # rubocop: disable CodeReuse/ActiveRecord
   def find_jobs(import_type)
     current_user.created_projects
-      .includes(:import_state)
+      .with_import_state
       .where(import_type: import_type)
       .to_json(only: [:id], methods: [:import_status])
   end

app/controllers/import/bitbucket_server_controller.rb

@@ -82,7 +82,7 @@ class Import::BitbucketServerController < Import::BaseController
 
   # rubocop: disable CodeReuse/ActiveRecord
   def filter_added_projects(import_type, import_sources)
-    current_user.created_projects.where(import_type: import_type, import_source: import_sources).includes(:import_state)
+    current_user.created_projects.where(import_type: import_type, import_source: import_sources).with_import_state
   end
   # rubocop: enable CodeReuse/ActiveRecord
 

app/controllers/import/manifest_controller.rb

@@ -87,7 +87,7 @@ class Import::ManifestController < Import::BaseController
     group.all_projects
       .where(import_type: 'manifest')
       .where(creator_id: current_user)
-      .includes(:import_state)
+      .with_import_state
   end
   # rubocop: enable CodeReuse/ActiveRecord
 

app/finders/contributed_projects_finder.rb

@@ -12,16 +12,14 @@ class ContributedProjectsFinder < UnionFinder
   #                visible by this user.
   #
   # Returns an ActiveRecord::Relation.
-  # rubocop: disable CodeReuse/ActiveRecord
   def execute(current_user = nil)
     # Do not show contributed projects if the user profile is private.
     return Project.none unless can_read_profile?(current_user)
 
     segments = all_projects(current_user)
 
-    find_union(segments, Project).includes(:namespace).order_id_desc
+    find_union(segments, Project).with_namespace.order_id_desc
   end
-  # rubocop: enable CodeReuse/ActiveRecord
 
   private
 

app/finders/personal_projects_finder.rb

@@ -17,15 +17,13 @@ class PersonalProjectsFinder < UnionFinder
   #                  min_access_level: integer
   #
   # Returns an ActiveRecord::Relation.
-  # rubocop: disable CodeReuse/ActiveRecord
   def execute(current_user = nil)
     return Project.none unless can?(current_user, :read_user_profile, @user)
 
     segments = all_projects(current_user)
 
-    find_union(segments, Project).includes(:namespace).order_updated_desc
+    find_union(segments, Project).with_namespace.order_updated_desc
   end
-  # rubocop: enable CodeReuse/ActiveRecord
 
   private
 

app/models/project.rb

@@ -411,6 +411,8 @@ class Project < ApplicationRecord
   scope :with_project_feature, -> { joins('LEFT JOIN project_features ON projects.id = project_features.project_id') }
   scope :inc_routes, -> { includes(:route, namespace: :route) }
   scope :with_statistics, -> { includes(:statistics) }
+  scope :with_namespace, -> { includes(:namespace) }
+  scope :with_import_state, -> { includes(:import_state) }
   scope :with_service, ->(service) { joins(service).eager_load(service) }
   scope :with_shared_runners, -> { where(shared_runners_enabled: true) }
   scope :with_container_registry, -> { where(container_registry_enabled: true) }

app/workers/concerns/application_worker.rb

@@ -9,6 +9,7 @@ module ApplicationWorker
 
   include Sidekiq::Worker # rubocop:disable Cop/IncludeSidekiqWorker
   include WorkerAttributes
+  include WorkerContext
 
   included do
     set_queue

app/workers/concerns/cronjob_queue.rb

@@ -8,5 +8,6 @@ module CronjobQueue
   included do
     queue_namespace :cronjob
     sidekiq_options retry: false
+    worker_context project: nil, namespace: nil, user: nil
   end
 end

app/workers/concerns/worker_context.rb

+# frozen_string_literal: true
+
+module WorkerContext
+  extend ActiveSupport::Concern
+
+  class_methods do
+    def worker_context(attributes)
+      @worker_context = Gitlab::ApplicationContext.new(attributes)
+    end
+
+    def get_worker_context
+      @worker_context || superclass_context
+    end
+
+    private
+
+    def superclass_context
+      return unless superclass.include?(WorkerContext)
+
+      superclass.get_worker_context
+    end
+  end
+
+  def with_context(context, &block)
+    Gitlab::ApplicationContext.new(context).use(&block)
+  end
+end

ee/app/workers/project_import_schedule_worker.rb

@@ -9,14 +9,14 @@ class ProjectImportScheduleWorker
   feature_category :importers
   sidekiq_options retry: false
 
-  # rubocop: disable CodeReuse/ActiveRecord
   def perform(project_id)
     return if Gitlab::Database.read_only?
 
-    import_state = ProjectImportState.find_by(project_id: project_id)
-    raise ImportStateNotFound unless import_state
+    project = Project.with_route.with_import_state.with_namespace.find_by_id(project_id)
+    raise ImportStateNotFound unless project&.import_state
 
-    import_state.schedule
+    with_context(project: project) do
+      project.import_state.schedule
+    end
   end
-  # rubocop: enable CodeReuse/ActiveRecord
 end

ee/app/workers/update_all_mirrors_worker.rb

@@ -14,24 +14,22 @@ class UpdateAllMirrorsWorker
   def perform
     return if Gitlab::Database.read_only?
 
-    Gitlab::ApplicationContext.with_context({ user: nil, project: nil, namespace: nil }) do
-      scheduled = 0
-      with_lease do
-        scheduled = schedule_mirrors!
-      end
-
-      # If we didn't get the lease, or no updates were scheduled, exit early
-      break unless scheduled > 0
-
-      # Wait to give some jobs a chance to complete
-      Kernel.sleep(RESCHEDULE_WAIT)
-
-      # If there's capacity left now (some jobs completed),
-      # reschedule this job to enqueue more work.
-      #
-      # This is in addition to the regular (cron-like) scheduling of this job.
-      UpdateAllMirrorsWorker.perform_async if Gitlab::Mirror.reschedule_immediately?
+    scheduled = 0
+    with_lease do
+      scheduled = schedule_mirrors!
     end
+
+    # If we didn't get the lease, or no updates were scheduled, exit early
+    return unless scheduled > 0
+
+    # Wait to give some jobs a chance to complete
+    Kernel.sleep(RESCHEDULE_WAIT)
+
+    # If there's capacity left now (some jobs completed),
+    # reschedule this job to enqueue more work.
+    #
+    # This is in addition to the regular (cron-like) scheduling of this job.
+    UpdateAllMirrorsWorker.perform_async if Gitlab::Mirror.reschedule_immediately?
   end
 
   # rubocop: disable CodeReuse/ActiveRecord
@@ -97,7 +95,7 @@ class UpdateAllMirrorsWorker
       .mirrors_to_sync(freeze_at)
       .reorder('import_state.next_execution_timestamp')
       .limit(batch_size)
-      .includes(:namespace) # Used by `project.mirror?`
+      .with_namespace # Used by `project.mirror?`
 
     relation = relation.where('import_state.next_execution_timestamp > ?', offset_at) if offset_at
 

lib/gitlab/application_context.rb

@@ -16,7 +16,7 @@ module Gitlab
 
     def self.with_context(args, &block)
       application_context = new(**args)
-      Labkit::Context.with_context(application_context.to_lazy_hash, &block)
+      application_context.use(&block)
     end
 
     def self.push(args)
@@ -42,6 +42,10 @@ module Gitlab
       end
     end
 
+    def use
+      Labkit::Context.with_context(to_lazy_hash) { yield }
+    end
+
     private
 
     attr_reader :set_values

lib/gitlab/sidekiq_middleware.rb

@@ -18,6 +18,7 @@ module Gitlab
         chain.add Labkit::Middleware::Sidekiq::Server
         chain.add Gitlab::SidekiqMiddleware::InstrumentationLogger
         chain.add Gitlab::SidekiqStatus::ServerMiddleware
+        chain.add Gitlab::SidekiqMiddleware::WorkerContext::Server
       end
     end
 

lib/gitlab/sidekiq_middleware/worker_context/server.rb

+# frozen_string_literal: true
+
+module Gitlab
+  module SidekiqMiddleware
+    module WorkerContext
+      class Server
+        def call(worker, job, _queue, &block)
+          worker_class = worker.class
+
+          # This is not a worker we know about, perhaps from a gem
+          return yield unless worker_class.respond_to?(:get_worker_context)
+
+          # Use the context defined on the class level as a base context
+          wrap_in_optional_context(worker_class.get_worker_context, &block)
+        end
+
+        private
+
+        def wrap_in_optional_context(context, &block)
+          return yield unless context
+
+          context.use(&block)
+        end
+      end
+    end
+  end
+end

spec/lib/gitlab/application_context_spec.rb

@@ -79,4 +79,18 @@ describe Gitlab::ApplicationContext do
         .to include(project: project.full_path, root_namespace: project.full_path_components.first)
     end
   end
+
+  describe '#use' do
+    let(:context) { described_class.new(user: build(:user)) }
+
+    it 'yields control' do
+      expect { |b| context.use(&b) }.to yield_control
+    end
+
+    it 'passes the expected context on to labkit' do
+      expect(Labkit::Context).to receive(:with_context).with(a_hash_including(user: duck_type(:call)))
+
+      context.use {}
+    end
+  end
 end

spec/lib/gitlab/sidekiq_middleware/worker_context/server_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::SidekiqMiddleware::WorkerContext::Server do
+  let(:worker_class) do
+    Class.new do
+      def self.name
+        "TestWorker"
+      end
+
+      # To keep track of the context that was active for certain arguments
+      cattr_accessor(:contexts) { {} }
+
+      include ApplicationWorker
+
+      worker_context user: nil
+
+      def perform(identifier, *args)
+        self.class.contexts.merge!(identifier => Labkit::Context.current.to_h)
+      end
+    end
+  end
+
+  let(:other_worker) do
+    Class.new do
+      def self.name
+        "OtherWorker"
+      end
+
+      include Sidekiq::Worker
+
+      def perform
+      end
+    end
+  end
+
+  before do
+    stub_const("TestWorker", worker_class)
+    stub_const("OtherWorker", other_worker)
+  end
+
+  around do |example|
+    Sidekiq::Testing.inline! { example.run }
+  end
+
+  before(:context) do
+    Sidekiq::Testing.server_middleware do |chain|
+      chain.add described_class
+    end
+  end
+
+  after(:context) do
+    Sidekiq::Testing.server_middleware do |chain|
+      chain.remove described_class
+    end
+  end
+
+  describe "#call" do
+    it 'applies a class context' do
+      Gitlab::ApplicationContext.with_context(user: build_stubbed(:user)) do
+        TestWorker.perform_async("identifier", 1)
+      end
+
+      expect(TestWorker.contexts['identifier'].keys).not_to include('meta.user')
+    end
+
+    it "doesn't fail for unknown workers" do
+      expect { OtherWorker.perform_async }.not_to raise_error
+    end
+  end
+end

spec/lib/gitlab/sidekiq_middleware_spec.rb

@@ -44,7 +44,8 @@ describe Gitlab::SidekiqMiddleware do
        Gitlab::SidekiqMiddleware::ServerMetrics,
        Gitlab::SidekiqMiddleware::ArgumentsLogger,
        Gitlab::SidekiqMiddleware::MemoryKiller,
-       Gitlab::SidekiqMiddleware::RequestStoreMiddleware
+       Gitlab::SidekiqMiddleware::RequestStoreMiddleware,
+       Gitlab::SidekiqMiddleware::WorkerContext::Server
       ]
     end
     let(:enabled_sidekiq_middlewares) { all_sidekiq_middlewares - disabled_sidekiq_middlewares }

spec/workers/concerns/cronjob_queue_spec.rb

@@ -21,4 +21,12 @@ describe CronjobQueue do
   it 'disables retrying of failed jobs' do
     expect(worker.sidekiq_options['retry']).to eq(false)
   end
+
+  it 'automatically clears project, user and namespace from the context', :aggregate_failues do
+    worker_context = worker.get_worker_context.to_lazy_hash.transform_values(&:call)
+
+    expect(worker_context[:user]).to be_nil
+    expect(worker_context[:root_namespace]).to be_nil
+    expect(worker_context[:project]).to be_nil
+  end
 end

spec/workers/concerns/worker_context_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe WorkerContext do
+  let(:worker) do
+    Class.new do
+      include WorkerContext
+    end
+  end
+
+  describe '.worker_context' do
+    it 'allows modifying the context for the entire worker' do
+      worker.worker_context(user: build_stubbed(:user))
+
+      expect(worker.get_worker_context).to be_a(Gitlab::ApplicationContext)
+    end
+
+    it 'allows fetches the context from a superclass if none was defined' do
+      worker.worker_context(user: build_stubbed(:user))
+      subclass = Class.new(worker)
+
+      expect(subclass.get_worker_context).to eq(worker.get_worker_context)
+    end
+  end
+
+  describe '#with_context' do
+    it 'allows modifying context when the job is running' do
+      worker.new.with_context(user: build_stubbed(:user, username: 'jane-doe')) do
+        expect(Labkit::Context.current.to_h).to include('meta.user' => 'jane-doe')
+      end
+    end
+  end
+end