Add more storage statistics

This adds counters for build artifacts and LFS objects, and moves
the preexisting repository_size and commit_count from the projects
table into a new project_statistics table.

The counters are displayed in the administration area for projects
and groups, and also available through the API for admins (on */all)
and normal users (on */owned)

The statistics are updated through ProjectCacheWorker, which can now
do more granular updates with the new :statistics argument.

1 files changed, 26 insertions, 0 deletions

diff --git a/spec/models/ci/build_spec.rb b/spec/models/ci/build_spec.rb
index a7e90c8a381..7e1d1126b97 100644
--- a/spec/models/ci/build_spec.rb
+++ b/spec/models/ci/build_spec.rb
@@ -85,4 +85,30 @@ describe Ci::Build, models: true do
       it { expect(build.trace_file_path).to eq(build.old_path_to_trace) }
     end
   end
+
+  describe '#update_project_statistics' do
+    let!(:build) { create(:ci_build, artifacts_size: 23) }
+
+    it 'updates project statistics when the artifact size changes' do
+      expect(ProjectCacheWorker).to receive(:perform_async)
+        .with(build.project_id, [], [:build_artifacts_size])
+
+      build.artifacts_size = 42
+      build.save!
+    end
+
+    it 'does not update project statistics when the artifact size stays the same' do
+      expect(ProjectCacheWorker).not_to receive(:perform_async)
+
+      build.name = 'changed'
+      build.save!
+    end
+
+    it 'updates project statistics when the build is destroyed' do
+      expect(ProjectCacheWorker).to receive(:perform_async)
+        .with(build.project_id, [], [:build_artifacts_size])
+
+      build.destroy
+    end
+  end
 end