Add Pipeline metrics worker

CHANGELOG.md

@@ -21,6 +21,7 @@ Please view this file on the master branch, on stable branches it's out of date.
   - Change user & group landing page routing from /u/:username to /:username
   - Prevent running GfmAutocomplete setup for each diff note !6569
   - Added documentation for .gitattributes files
+  - Move Pipeline Metrics to separate worker
   - AbstractReferenceFilter caches project_refs on RequestStore when active
   - Replaced the check sign to arrow in the show build view. !6501
   - Add a /wip slash command to toggle the Work In Progress status of a merge request. !6259 (tbalthazar)

app/models/ci/pipeline.rb

@@ -49,6 +49,10 @@ module Ci
         transition any => :canceled
       end
 
+      # IMPORTANT
+      # Do not add any operations to this state_machine
+      # Create a separate worker for each new operation
+
       before_transition [:created, :pending] => :running do |pipeline|
         pipeline.started_at = Time.now
       end
@@ -62,13 +66,11 @@ module Ci
       end
 
       after_transition [:created, :pending] => :running do |pipeline|
-        MergeRequest::Metrics.where(merge_request_id: pipeline.merge_requests.map(&:id)).
-          update_all(latest_build_started_at: pipeline.started_at, latest_build_finished_at: nil)
+        pipeline.run_after_commit { PipelineMetricsWorker.perform_async(id) }
       end
 
       after_transition any => [:success] do |pipeline|
-        MergeRequest::Metrics.where(merge_request_id: pipeline.merge_requests.map(&:id)).
-          update_all(latest_build_finished_at: pipeline.finished_at)
+        pipeline.run_after_commit { PipelineMetricsWorker.perform_async(id) }
       end
 
       after_transition [:created, :pending, :running] => :success do |pipeline|

app/workers/pipeline_metrics_worker.rb

@@ -0,0 +1,15 @@
+class PipelineMetricsWorker
+  include Sidekiq::Worker
+
+  sidekiq_options queue: :default
+
+  def perform(pipeline_id)
+    Ci::Pipeline.find_by(id: pipeline_id).try do |pipeline|
+      merge_requests = pipeline.merge_requests.map(&:id)
+
+      metrics = MergeRequest::Metrics.where(merge_request_id: merge_requests)
+      metrics.update_all(latest_build_started_at: pipeline.started_at) if pipeline.active?
+      metrics.update_all(latest_build_finished_at: pipeline.finished_at) if pipeline.success?
+    end
+  end
+end