Use Etag caching for pipelines json

Enable caching in the Etag::Middleware and when a pipeline changes
status, expire the cache for the project pipelines path.

1 files changed, 18 insertions, 0 deletions

diff --git a/app/services/ci/expire_pipeline_cache_service.rb b/app/services/ci/expire_pipeline_cache_service.rb
new file mode 100644
index 00000000000..95afe72e735
--- /dev/null
+++ b/app/services/ci/expire_pipeline_cache_service.rb
@@ -0,0 +1,18 @@
+module Ci
+  class ExpirePipelineCacheService < BaseService
+    def execute(pipeline)
+      @pipeline = pipeline
+
+      Gitlab::EtagCaching::Store.new.touch(project_pipelines_path)
+    end
+
+    private
+
+    def project_pipelines_path
+      Gitlab::Routing.url_helpers.namespace_project_pipelines_path(
+        project.namespace,
+        project,
+        format: :json)
+    end
+  end
+end