Merge branch 'add-back-mr-diff-deletion-migration' into 'master'

Add back MR diff deletion migration

See merge request gitlab-org/gitlab-ce!20331

3 files changed, 93 insertions, 29 deletions

diff --git a/spec/lib/gitlab/background_migration/delete_diff_files_spec.rb b/spec/lib/gitlab/background_migration/delete_diff_files_spec.rb
index 1b3df7b20d4..64c994a268f 100644
--- a/spec/lib/gitlab/background_migration/delete_diff_files_spec.rb
+++ b/spec/lib/gitlab/background_migration/delete_diff_files_spec.rb
@@ -1,31 +1,35 @@
 require 'spec_helper'
 
-describe Gitlab::BackgroundMigration::DeleteDiffFiles, :migration, schema: 20180626125654 do
+describe Gitlab::BackgroundMigration::DeleteDiffFiles, :migration, schema: 20180619121030 do
   describe '#perform' do
     context 'when diff files can be deleted' do
       let(:merge_request) { create(:merge_request, :merged) }
-      let(:merge_request_diff) do
+      let!(:merge_request_diff) do
         merge_request.create_merge_request_diff
         merge_request.merge_request_diffs.first
       end
 
+      let(:perform) do
+        described_class.new.perform(MergeRequestDiff.pluck(:id))
+      end
+
       it 'deletes all merge request diff files' do
-        expect { described_class.new.perform(merge_request_diff.id) }
+        expect { perform }
           .to change { merge_request_diff.merge_request_diff_files.count }
           .from(20).to(0)
       end
 
       it 'updates state to without_files' do
-        expect { described_class.new.perform(merge_request_diff.id) }
+        expect { perform }
           .to change { merge_request_diff.reload.state }
           .from('collected').to('without_files')
       end
 
       it 'rollsback if something goes wrong' do
-        expect(MergeRequestDiffFile).to receive_message_chain(:where, :delete_all)
+        expect(described_class::MergeRequestDiffFile).to receive_message_chain(:where, :delete_all)
           .and_raise
 
-        expect { described_class.new.perform(merge_request_diff.id) }
+        expect { perform }
           .to raise_error
 
         merge_request_diff.reload
@@ -35,35 +39,35 @@ describe Gitlab::BackgroundMigration::DeleteDiffFiles, :migration, schema: 20180
       end
     end
 
-    it 'deletes no merge request diff files when MR is not merged' do
-      merge_request = create(:merge_request, :opened)
-      merge_request.create_merge_request_diff
-      merge_request_diff = merge_request.merge_request_diffs.first
-
-      expect { described_class.new.perform(merge_request_diff.id) }
-        .not_to change { merge_request_diff.merge_request_diff_files.count }
-        .from(20)
-    end
-
-    it 'deletes no merge request diff files when diff is marked as "without_files"' do
+    it 'reschedules itself when should_wait_deadtuple_vacuum' do
       merge_request = create(:merge_request, :merged)
-      merge_request.create_merge_request_diff
-      merge_request_diff = merge_request.merge_request_diffs.first
+      first_diff = merge_request.merge_request_diff
+      second_diff = merge_request.create_merge_request_diff
 
-      merge_request_diff.clean!
+      Sidekiq::Testing.fake! do
+        worker = described_class.new
+        allow(worker).to receive(:should_wait_deadtuple_vacuum?) { true }
 
-      expect { described_class.new.perform(merge_request_diff.id) }
-        .not_to change { merge_request_diff.merge_request_diff_files.count }
-        .from(20)
+        worker.perform([first_diff.id, second_diff.id])
+
+        expect(described_class.name.demodulize).to be_scheduled_delayed_migration(5.minutes, [first_diff.id, second_diff.id])
+        expect(BackgroundMigrationWorker.jobs.size).to eq(1)
+      end
     end
+  end
 
-    it 'deletes no merge request diff files when diff is the latest' do
-      merge_request = create(:merge_request, :merged)
-      merge_request_diff = merge_request.merge_request_diff
+  describe '#should_wait_deadtuple_vacuum?' do
+    it 'returns true when hitting merge_request_diff_files hits DEAD_TUPLES_THRESHOLD', :postgresql do
+      worker = described_class.new
+      threshold_query_result = [{ "n_dead_tup" => described_class::DEAD_TUPLES_THRESHOLD.to_s }]
+      normal_query_result = [{ "n_dead_tup" => '3' }]
+
+      allow(worker)
+        .to receive(:execute_statement)
+        .with(/SELECT n_dead_tup */)
+        .and_return(threshold_query_result, normal_query_result)
 
-      expect { described_class.new.perform(merge_request_diff.id) }
-        .not_to change { merge_request_diff.merge_request_diff_files.count }
-        .from(20)
+      expect(worker.should_wait_deadtuple_vacuum?).to be(true)
     end
   end
 end
diff --git a/spec/lib/gitlab/background_migration/schedule_diff_files_deletion_spec.rb b/spec/lib/gitlab/background_migration/schedule_diff_files_deletion_spec.rb
new file mode 100644
index 00000000000..fb5093b0bd1
--- /dev/null
+++ b/spec/lib/gitlab/background_migration/schedule_diff_files_deletion_spec.rb
@@ -0,0 +1,43 @@
+require 'spec_helper'
+
+describe Gitlab::BackgroundMigration::ScheduleDiffFilesDeletion, :migration, schema: 20180619121030 do
+  describe '#perform' do
+    let(:merge_request_diffs) { table(:merge_request_diffs) }
+    let(:merge_requests) { table(:merge_requests) }
+    let(:namespaces) { table(:namespaces) }
+    let(:projects) { table(:projects) }
+
+    before do
+      stub_const("#{described_class.name}::DIFF_BATCH_SIZE", 3)
+
+      namespaces.create!(id: 1, name: 'gitlab', path: 'gitlab')
+      projects.create!(id: 1, namespace_id: 1, name: 'gitlab', path: 'gitlab')
+
+      merge_requests.create!(id: 1, target_project_id: 1, source_project_id: 1, target_branch: 'feature', source_branch: 'master', state: 'merged')
+
+      merge_request_diffs.create!(id: 1, merge_request_id: 1, state: 'collected')
+      merge_request_diffs.create!(id: 2, merge_request_id: 1, state: 'empty')
+      merge_request_diffs.create!(id: 3, merge_request_id: 1, state: 'without_files')
+      merge_request_diffs.create!(id: 4, merge_request_id: 1, state: 'collected')
+      merge_request_diffs.create!(id: 5, merge_request_id: 1, state: 'collected')
+      merge_request_diffs.create!(id: 6, merge_request_id: 1, state: 'collected')
+      merge_request_diffs.create!(id: 7, merge_request_id: 1, state: 'collected')
+
+      merge_requests.update(1, latest_merge_request_diff_id: 7)
+    end
+
+    it 'correctly schedules diff file deletion workers' do
+      Sidekiq::Testing.fake! do
+        Timecop.freeze do
+          described_class.new.perform
+
+          expect(described_class::MIGRATION).to be_scheduled_delayed_migration(5.minutes, [1, 4, 5])
+
+          expect(described_class::MIGRATION).to be_scheduled_delayed_migration(10.minutes, [6])
+
+          expect(BackgroundMigrationWorker.jobs.size).to eq(2)
+        end
+      end
+    end
+  end
+end
diff --git a/spec/migrations/enqueue_delete_diff_files_workers_spec.rb b/spec/migrations/enqueue_delete_diff_files_workers_spec.rb
new file mode 100644
index 00000000000..6bae870920c
--- /dev/null
+++ b/spec/migrations/enqueue_delete_diff_files_workers_spec.rb
@@ -0,0 +1,17 @@
+require 'spec_helper'
+require Rails.root.join('db', 'post_migrate', '20180619121030_enqueue_delete_diff_files_workers.rb')
+
+describe EnqueueDeleteDiffFilesWorkers, :migration, :sidekiq do
+  it 'correctly schedules diff files deletion schedulers' do
+    Sidekiq::Testing.fake! do
+      expect(BackgroundMigrationWorker)
+        .to receive(:perform_async)
+        .with(described_class::SCHEDULER)
+        .and_call_original
+
+      migrate!
+
+      expect(BackgroundMigrationWorker.jobs.size).to eq(1)
+    end
+  end
+end