Create idea of read-only database

In GitLab EE, a GitLab instance can be read-only (e.g. when it's a Geo
secondary node). But in GitLab CE it also might be useful to have the
"read-only" idea around. So port it back to GitLab CE.

Also having the principle of read-only in GitLab CE would hopefully
lead to less errors introduced, doing write operations when there
aren't allowed for read-only calls.

Closes gitlab-org/gitlab-ce#37534.

1 files changed, 8 insertions, 1 deletions

diff --git a/spec/lib/banzai/renderer_spec.rb b/spec/lib/banzai/renderer_spec.rb
index da42272bbef..81a04a2d46d 100644
--- a/spec/lib/banzai/renderer_spec.rb
+++ b/spec/lib/banzai/renderer_spec.rb
@@ -31,7 +31,14 @@ describe Banzai::Renderer do
         let(:object) { fake_object(fresh: false) }
 
         it 'caches and returns the result' do
-          expect(object).to receive(:refresh_markdown_cache!).with(do_update: true)
+          expect(object).to receive(:refresh_markdown_cache!)
+
+          is_expected.to eq('field_html')
+        end
+
+        it "skips database caching on a GitLab read-only instance" do
+          allow(Gitlab::Database).to receive(:read_only?).and_return(true)
+          expect(object).to receive(:refresh_markdown_cache!)
 
           is_expected.to eq('field_html')
         end