Create idea of read-only databasetc-geo-read-only-idea

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, 10 insertions, 0 deletions

diff --git a/spec/models/concerns/routable_spec.rb b/spec/models/concerns/routable_spec.rb
index b463d12e448..ab8773b7ede 100644
--- a/spec/models/concerns/routable_spec.rb
+++ b/spec/models/concerns/routable_spec.rb
@@ -12,6 +12,16 @@ describe Group, 'Routable' do
     it { is_expected.to have_many(:redirect_routes).dependent(:destroy) }
   end
 
+  describe 'GitLab read-only instance' do
+    it 'does not save route if route is not present' do
+      group.route.path = ''
+      allow(Gitlab::Database).to receive(:read_only?).and_return(true)
+      expect(group).to receive(:update_route).and_call_original
+
+      expect { group.full_path }.to change { Route.count }.by(0)
+    end
+  end
+
   describe 'Callbacks' do
     it 'creates route record on create' do
       expect(group.route.path).to eq(group.path)