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, 33 insertions, 0 deletions

diff --git a/spec/requests/api/groups_spec.rb b/spec/requests/api/groups_spec.rb
index cdeb965b413..0e8d6faea27 100644
--- a/spec/requests/api/groups_spec.rb
+++ b/spec/requests/api/groups_spec.rb
@@ -35,6 +35,14 @@ describe API::Groups, api: true  do
         expect(json_response.length).to eq(1)
         expect(json_response.first['name']).to eq(group1.name)
       end
+
+      it "does not include statistics" do
+        get api("/groups", user1), statistics: true
+
+        expect(response).to have_http_status(200)
+        expect(json_response).to be_an Array
+        expect(json_response.first).not_to include 'statistics'
+      end
     end
 
     context "when authenticated as admin" do
@@ -44,6 +52,31 @@ describe API::Groups, api: true  do
         expect(json_response).to be_an Array
         expect(json_response.length).to eq(2)
       end
+
+      it "does not include statistics by default" do
+        get api("/groups", admin)
+
+        expect(response).to have_http_status(200)
+        expect(json_response).to be_an Array
+        expect(json_response.first).not_to include('statistics')
+      end
+
+      it "includes statistics if requested" do
+        attributes = {
+          storage_size: 702,
+          repository_size: 123,
+          lfs_objects_size: 234,
+          build_artifacts_size: 345,
+        }
+
+        project1.statistics.update!(attributes)
+
+        get api("/groups", admin), statistics: true
+
+        expect(response).to have_http_status(200)
+        expect(json_response).to be_an Array
+        expect(json_response.first['statistics']).to eq attributes.stringify_keys
+      end
     end
 
     context "when using skip_groups in request" do