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, 21 insertions, 0 deletions

diff --git a/spec/helpers/storage_helper_spec.rb b/spec/helpers/storage_helper_spec.rb
new file mode 100644
index 00000000000..4627a1e1872
--- /dev/null
+++ b/spec/helpers/storage_helper_spec.rb
@@ -0,0 +1,21 @@
+require 'spec_helper'
+
+describe StorageHelper do
+  describe '#storage_counter' do
+    it 'formats bytes to one decimal place' do
+      expect(helper.storage_counter(1.23.megabytes)).to eq '1.2 MB'
+    end
+
+    it 'does not add decimals for sizes < 1 MB' do
+      expect(helper.storage_counter(23.5.kilobytes)).to eq '24 KB'
+    end
+
+    it 'does not add decimals for zeroes' do
+      expect(helper.storage_counter(2.megabytes)).to eq '2 MB'
+    end
+
+    it 'uses commas as thousands separator' do
+      expect(helper.storage_counter(100_000_000_000_000_000)).to eq '90,949.5 TB'
+    end
+  end
+end