Add rake task. Adopt the latest fix. Drop CreateTraceArtifactService

app/services/ci/create_trace_artifact_service.rb

-module Ci
-  class CreateTraceArtifactService < BaseService
-    def execute(job)
-      return if job.job_artifacts_trace
-
-      job.trace.read do |stream|
-        break unless stream.file?
-
-        clone_file!(stream.path, JobArtifactUploader.workhorse_upload_path) do |clone_path|
-          create_job_trace!(job, clone_path)
-          FileUtils.rm(stream.path)
-        end
-      end
-    end
-
-    private
-
-    def create_job_trace!(job, path)
-      File.open(path) do |stream|
-        job.create_job_artifacts_trace!(
-          project: job.project,
-          file_type: :trace,
-          file: stream)
-      end
-    end
-
-    def clone_file!(src_path, temp_dir)
-      FileUtils.mkdir_p(temp_dir)
-      Dir.mktmpdir('tmp-trace', temp_dir) do |dir_path|
-        temp_path = File.join(dir_path, "job.log")
-        FileUtils.copy(src_path, temp_path)
-        yield(temp_path)
-      end
-    end
-  end
-end

app/workers/archive_legacy_trace_worker.rb

+class ArchiveLegacyTraceWorker
+  include ApplicationWorker
+  include ObjectStorageQueue
+
+  def perform(job_id)
+    Ci::Build.find_by(id: job_id).try do |job|
+      job.trace.archive!
+    end
+  end
+end

app/workers/create_trace_artifact_worker.rb

@@ -2,10 +2,8 @@ class CreateTraceArtifactWorker
   include ApplicationWorker
   include PipelineQueue
 
-  # TODO: this worker should use BackgroundMigration or ObjectStorage queue
-
   def perform(job_id)
-    Ci::Build.preload(:project, :user).find_by(id: job_id).try do |job|
+    Ci::Build.find_by(id: job_id).try do |job|
       job.trace.archive!
     end
   end

lib/gitlab/ci/trace.rb

@@ -112,18 +112,28 @@ module Gitlab
       private
 
       def archive_stream!(stream)
-        file = Tempfile.new('trace.log')
-        size = IO.copy_stream(file, stream)
-        raise 'Not all saved' unless size == stream.size
-        file.close
-
-        job.create_job_artifacts_trace!(
-          project: job.project,
-          file_type: :trace,
-          file: file)
-      ensure
-        file&.close
-        file&.unlink
+        clone_file!(stream, JobArtifactUploader.workhorse_upload_path) do |clone_path|
+          create_job_trace!(job, clone_path)
+        end
+      end
+
+      def clone_file!(src_stream, temp_dir)
+        FileUtils.mkdir_p(temp_dir)
+        Dir.mktmpdir('tmp-trace', temp_dir) do |dir_path|
+          temp_path = File.join(dir_path, "job.log")
+          size = IO.write(src_stream, temp_path)
+          raise 'Not all saved' unless size == src_stream.size
+          yield(temp_path)
+        end
+      end
+
+      def create_job_trace!(job, path)
+        File.open(path) do |stream|
+          job.create_job_artifacts_trace!(
+            project: job.project,
+            file_type: :trace,
+            file: stream)
+        end
       end
 
       def ensure_path

lib/tasks/gitlab/traces.rake

+require 'logger'
+require 'resolv-replace'
+
+desc "GitLab | Archive legacy traces to trace artifacts"
+namespace :gitlab do
+  namespace :traces do
+    task archive: :environment do
+      logger = Logger.new(STDOUT)
+      logger.info('Archiving legacy traces')
+
+      job_ids = Ci::Build.complete.without_trace_artifact.pluck(:id)
+      job_ids = job_ids.map { |build_id| [build_id] }
+
+      ArchiveLegacyTraceWorker.bulk_perform_async(job_ids)
+    end
+  end
+end