Add build success worker that runs asynchronously

app/models/ci/build.rb

@@ -76,25 +76,22 @@ module Ci
 
     state_machine :status do
       after_transition pending: :running do |build|
-        build.run_after_commit { BuildHooksWorker.perform_async(id) }
+        build.run_after_commit do
+          BuildHooksWorker.perform_async(id)
+        end
       end
 
       after_transition any => [:success, :failed, :canceled] do |build|
         build.update_coverage
-        build.run_after_commit { BuildHooksWorker.perform_async(id) }
+
+        build.run_after_commit do
+          BuildHooksWorker.perform_async(id)
+        end
       end
 
       after_transition any => [:success] do |build|
-        if build.environment.present?
-          service = CreateDeploymentService.new(
-            build.project, build.user,
-            environment: build.environment,
-            sha: build.sha,
-            ref: build.ref,
-            tag: build.tag,
-            options: build.options.to_h[:environment],
-            variables: build.variables)
-          service.execute(build)
+        build.run_after_commit do
+          BuildSuccessWorker.perform_async(id)
         end
       end
     end

app/workers/build_success_worker.rb

+class BuildSuccessWorker
+  include Sidekiq::Worker
+  sidekiq_options queue: :default
+
+  def perform(build_id)
+    Ci::Build.find_by(id: build_id).try do |build|
+      perform_deloyment(build)
+    end
+  end
+
+  private
+
+  def perform_deloyment(build)
+    return if build.environment.blank?
+
+    service = CreateDeploymentService.new(
+      build.project, build.user,
+      environment: build.environment,
+      sha: build.sha,
+      ref: build.ref,
+      tag: build.tag,
+      options: build.options.to_h[:environment],
+      variables: build.variables)
+
+    service.execute(build)
+  end
+end

spec/workers/build_success_worker_spec.rb

+require 'spec_helper'
+
+describe BuildSuccessWorker do
+  describe '#perform' do
+    context 'when build exists' do
+      context 'when build belogs to the environment' do
+        let!(:build) { create(:ci_build, environment: 'production') }
+
+        it 'executes deployment service' do
+          expect_any_instance_of(CreateDeploymentService)
+            .to receive(:execute)
+
+          described_class.new.perform(build.id)
+        end
+      end
+    end
+
+    context 'when build does not exist' do
+      it 'does not raise exception' do
+        expect { described_class.new.perform(123) }
+          .not_to raise_error
+      end
+    end
+  end
+end