Fix async pipeline and remove unrelated changes

app/models/ci/build.rb

@@ -67,7 +67,7 @@ module Ci
           environment: build.environment,
           status_event: 'enqueue'
         )
-        MergeRequests::AddTodoWhenBuildFailsService.new(build.project, nil).close(new_build.pipeline)
+        MergeRequests::AddTodoWhenBuildFailsService.new(build.project, nil).close(new_build)
         build.pipeline.mark_as_processable_after_stage(build.stage_idx)
         new_build
       end

app/models/ci/pipeline.rb

@@ -73,14 +73,6 @@ module Ci
       after_transition do |pipeline, transition|
         pipeline.execute_hooks unless transition.loopback?
       end
-
-      after_transition [:created, :pending, :running] => :success do |pipeline|
-        MergeRequests::MergeWhenBuildSucceedsService.new(pipeline.project, nil).trigger(pipeline)
-      end
-
-      after_transition any => :failed do |pipeline|
-        MergeRequests::AddTodoWhenBuildFailsService.new(pipeline.project, nil).execute(pipeline)
-      end
     end
     # ref can't be HEAD or SHA, can only be branch/tag name

app/models/commit_status.rb

@@ -69,11 +69,6 @@ class CommitStatus < ActiveRecord::Base
       commit_status.update_attributes finished_at: Time.now
     end
-    after_transition any => [:success, :failed, :canceled] do |commit_status|
-      commit_status.pipeline.try(:process!)
-      true
-    end
-
     after_transition [:created, :pending, :running] => :success do |commit_status|
       MergeRequests::MergeWhenBuildSucceedsService.new(commit_status.pipeline.project, nil).trigger(commit_status)
     end
@@ -86,7 +81,7 @@ class CommitStatus < ActiveRecord::Base
       if commit_status.pipeline && !transition.loopback?
         ProcessPipelineWorker.perform_async(
           commit_status.pipeline.id,
-          process: HasStatus.COMPLETED_STATUSES.include?(commit_status.status))
+          process: HasStatus::COMPLETED_STATUSES.include?(commit_status.status))
       end
       true

app/services/merge_requests/add_todo_when_build_fails_service.rb

 module MergeRequests
   class AddTodoWhenBuildFailsService < MergeRequests::BaseService
     # Adds a todo to the parent merge_request when a CI build fails
-    def execute(pipeline)
-      each_merge_request(pipeline) do |merge_request|
+    def execute(commit_status)
+      each_merge_request(commit_status) do |merge_request|
         todo_service.merge_request_build_failed(merge_request)
       end
     end
     # Closes any pending build failed todos for the parent MRs when a build is retried
-    def close(pipeline)
-      each_merge_request(pipeline) do |merge_request|
+    def close(commit_status)
+      each_merge_request(commit_status) do |merge_request|
         todo_service.merge_request_build_retried(merge_request)
       end
     end

app/services/merge_requests/base_service.rb

@@ -42,11 +42,11 @@ module MergeRequests
       super(:merge_request)
     end
-    def merge_request_from(pipeline)
-      branches = pipeline.ref
+    def merge_request_from(commit_status)
+      branches = commit_status.ref
       # This is for ref-less builds
-      branches ||= @project.repository.branch_names_contains(pipeline.sha)
+      branches ||= @project.repository.branch_names_contains(commit_status.sha)
       return [] if branches.blank?
@@ -56,11 +56,14 @@ module MergeRequests
       merge_requests.uniq.select(&:source_project)
     end
-    def each_merge_request(pipeline)
+    def each_merge_request(commit_status)
       merge_request_from(commit_status).each do |merge_request|
-        next unless pipeline == merge_request.pipeline
-        yield merge_request
+        pipeline = merge_request.pipeline
+        next unless pipeline
+        next unless pipeline.sha == commit_status.sha
+
+        yield merge_request, pipeline
       end
     end
   end

app/workers/process_pipeline_worker.rb

@@ -10,7 +10,7 @@ class ProcessPipelineWorker
       return
     end
-    pipeline.process! if params[:process]
+    pipeline.process! if params['process']
     pipeline.update_status
   end