Reset project pushes_since_gc when we enqueue the git gc call

CHANGELOG

@@ -75,6 +75,7 @@ v 8.10.0 (unreleased)
   - Fix 404 redirect after validation fails importing a GitLab project
   - Added setting to set new users by default as external !4545 (Dravere)
   - Add min value for project limit field on user's form !3622 (jastkand)
+  - Reset project pushes_since_gc when we enqueue the git gc call
   - Add reminder to not paste private SSH keys !4399 (Ingo Blechschmidt)
   - Remove duplicate `description` field in `MergeRequest` entities (Ben Boeckel)
   - Style of import project buttons were fixed in the new project page. !5183 (rdemirbay)

app/services/projects/housekeeping_service.rb

@@ -22,11 +22,7 @@ module Projects
     def execute
       raise LeaseTaken unless try_obtain_lease
 
-      GitGarbageCollectWorker.perform_async(@project.id)
-    ensure
-      Gitlab::Metrics.measure(:reset_pushes_since_gc) do
-        update_pushes_since_gc(0)
-      end
+      execute_gitlab_shell_gc
     end
 
     def needed?
@@ -34,18 +30,26 @@ module Projects
     end
 
     def increment!
+      if Gitlab::ExclusiveLease.new("project_housekeeping:increment!:#{@project.id}", timeout: 60).try_obtain
         Gitlab::Metrics.measure(:increment_pushes_since_gc) do
           update_pushes_since_gc(@project.pushes_since_gc + 1)
         end
       end
+    end
 
     private
 
+    def execute_gitlab_shell_gc
+      GitGarbageCollectWorker.perform_async(@project.id)
+    ensure
+      Gitlab::Metrics.measure(:reset_pushes_since_gc) do
+        update_pushes_since_gc(0)
+      end
+    end
+
     def update_pushes_since_gc(new_value)
-      if Gitlab::ExclusiveLease.new("project_housekeeping:update_pushes_since_gc:#{project.id}", timeout: 60).try_obtain
       @project.update_column(:pushes_since_gc, new_value)
     end
-    end
 
     def try_obtain_lease
       Gitlab::Metrics.measure(:obtain_housekeeping_lease) do

spec/services/projects/housekeeping_service_spec.rb

@@ -15,15 +15,25 @@ describe Projects::HousekeepingService do
       expect(GitGarbageCollectWorker).to receive(:perform_async).with(project.id)
 
       subject.execute
-      expect(project.pushes_since_gc).to eq(0)
+      expect(project.reload.pushes_since_gc).to eq(0)
     end
 
-    it 'does not enqueue a job when no lease can be obtained' do
+    context 'when no lease can be obtained' do
+      before(:each) do
         expect(subject).to receive(:try_obtain_lease).and_return(false)
+      end
+
+      it 'does not enqueue a job' do
         expect(GitGarbageCollectWorker).not_to receive(:perform_async)
 
         expect { subject.execute }.to raise_error(Projects::HousekeepingService::LeaseTaken)
-      expect(project.pushes_since_gc).to eq(0)
+      end
+
+      it 'does not reset pushes_since_gc' do
+        expect do
+          expect { subject.execute }.to raise_error(Projects::HousekeepingService::LeaseTaken)
+        end.not_to change { project.pushes_since_gc }.from(3)
+      end
     end
   end
 
@@ -39,10 +49,24 @@ describe Projects::HousekeepingService do
   end
 
   describe 'increment!' do
+    let(:lease_key) { "project_housekeeping:increment!:#{project.id}" }
+
     it 'increments the pushes_since_gc counter' do
-      expect(project.pushes_since_gc).to eq(0)
+      lease = double(:lease, try_obtain: true)
+      expect(Gitlab::ExclusiveLease).to receive(:new).with(lease_key, anything).and_return(lease)
+
+      expect do
+        subject.increment!
+      end.to change { project.pushes_since_gc }.from(0).to(1)
+    end
+
+    it 'does not increment when no lease can be obtained' do
+      lease = double(:lease, try_obtain: false)
+      expect(Gitlab::ExclusiveLease).to receive(:new).with(lease_key, anything).and_return(lease)
+
+      expect do
         subject.increment!
-      expect(project.pushes_since_gc).to eq(1)
+      end.not_to change { project.pushes_since_gc }
     end
   end
 end