Gem metadata extraction

Takes a gem file and extracts the metadata

app/assets/javascripts/packages/list/constants.js

@@ -82,6 +82,10 @@ export const PACKAGE_TYPES = [
     title: s__('PackageRegistry|PyPI'),
     type: PackageType.PYPI,
   },
+  {
+    title: s__('PackageRegistry|RubyGems'),
+    type: PackageType.RUBYGEMS,
+  },
 ];
 
 export const LIST_TITLE_TEXT = s__('PackageRegistry|Package Registry');

app/assets/javascripts/packages/shared/constants.js

@@ -7,6 +7,7 @@ export const PackageType = {
   NUGET: 'nuget',
   PYPI: 'pypi',
   COMPOSER: 'composer',
+  RUBYGEMS: 'rubygems',
   GENERIC: 'generic',
 };
 

app/assets/javascripts/packages/shared/utils.js

@@ -19,6 +19,8 @@ export const getPackageTypeLabel = (packageType) => {
       return s__('PackageType|NuGet');
     case PackageType.PYPI:
       return s__('PackageType|PyPI');
+    case PackageType.RUBYGEMS:
+      return s__('PackageType|RubyGems');
     case PackageType.COMPOSER:
       return s__('PackageType|Composer');
     case PackageType.GENERIC:

app/services/packages/rubygems/create_dependencies_service.rb

+# frozen_string_literal: true
+
+module Packages
+  module Rubygems
+    class CreateDependenciesService
+      include BulkInsertSafe
+
+      def initialize(package, gemspec)
+        @package = package
+        @gemspec = gemspec
+      end
+
+      def execute
+        set_dependencies
+      end
+
+      private
+
+      attr_reader :package, :gemspec
+
+      def set_dependencies
+        Packages::Dependency.transaction do
+          dependency_type_rows = gemspec.dependencies.map do |dependency|
+            dependency = Packages::Dependency.safe_find_or_create_by!(
+              name: dependency.name,
+              version_pattern: dependency.requirement.to_s
+            )
+
+            {
+              dependency_id: dependency.id,
+              package_id: package.id,
+              dependency_type: :dependencies
+            }
+          end
+
+          package.dependency_links.upsert_all(
+            dependency_type_rows,
+            unique_by: %i[package_id dependency_id dependency_type]
+          )
+        end
+      end
+    end
+  end
+end

app/services/packages/rubygems/create_gemspec_service.rb

+# frozen_string_literal: true
+
+module Packages
+  module Rubygems
+    class CreateGemspecService
+      def initialize(package, gemspec)
+        @package = package
+        @gemspec = gemspec
+      end
+
+      def execute
+        write_gemspec_to_file
+      end
+
+      private
+
+      attr_reader :package, :gemspec
+
+      def write_gemspec_to_file
+        file = Tempfile.new
+
+        begin
+          content = gemspec.to_ruby
+          file.write(content)
+          file.flush
+
+          package.package_files.create!(
+            file: file,
+            size: file.size,
+            file_name: "#{gemspec.name}.gemspec",
+            file_sha1: Digest::SHA1.hexdigest(content),
+            file_md5: Digest::MD5.hexdigest(content),
+            file_sha256: Digest::SHA256.hexdigest(content)
+          )
+        ensure
+          file.close
+          file.unlink
+        end
+      end
+    end
+  end
+end

app/services/packages/rubygems/metadata_extraction_service.rb

+# frozen_string_literal: true
+
+module Packages
+  module Rubygems
+    class MetadataExtractionService
+      def initialize(package, gemspec)
+        @package = package
+        @gemspec = gemspec
+      end
+
+      def execute
+        write_metadata
+      end
+
+      private
+
+      attr_reader :package, :gemspec
+
+      # rubocop:disable Metrics/AbcSize
+      # rubocop:disable Metrics/PerceivedComplexity
+      # rubocop:disable Metrics/CyclomaticComplexity
+      def write_metadata
+        metadatum.update!(
+          authors: gemspec&.authors,
+          files: gemspec&.files&.to_json,
+          summary: gemspec&.summary,
+          description: gemspec&.description,
+          email: gemspec&.email,
+          homepage: gemspec&.homepage,
+          licenses: gemspec&.licenses&.to_json,
+          metadata: gemspec&.metadata&.to_json,
+          author: gemspec&.author,
+          bindir: gemspec&.bindir,
+          executables: gemspec&.executables&.to_json,
+          extensions: gemspec&.extensions&.to_json,
+          extra_rdoc_files: gemspec&.extra_rdoc_files&.to_json,
+          platform: gemspec&.platform,
+          post_install_message: gemspec&.post_install_message,
+          rdoc_options: gemspec&.rdoc_options&.to_json,
+          require_paths: gemspec&.require_paths&.to_json,
+          required_ruby_version: gemspec&.required_ruby_version&.to_s,
+          required_rubygems_version: gemspec&.required_rubygems_version&.to_s,
+          requirements: gemspec&.requirements&.to_json,
+          rubygems_version: gemspec&.rubygems_version
+        )
+      end
+      # rubocop:enable Metrics/AbcSize
+      # rubocop:enable Metrics/PerceivedComplexity
+      # rubocop:enable Metrics/CyclomaticComplexity
+
+      def metadatum
+        Packages::Rubygems::Metadatum.safe_find_or_create_by!(package: package)
+      end
+    end
+  end
+end

app/services/packages/rubygems/process_gem_service.rb

+# frozen_string_literal: true
+
+require 'rubygems/package'
+
+module Packages
+  module Rubygems
+    class ProcessGemService
+      include Gitlab::Utils::StrongMemoize
+      include ExclusiveLeaseGuard
+
+      ExtractionError = Class.new(StandardError)
+      DEFAULT_LEASE_TIMEOUT = 1.hour.to_i.freeze
+
+      def initialize(package_file)
+        @package_file = package_file
+      end
+
+      def execute
+        return success if process_gem
+
+        error('Gem was not processed')
+      end
+
+      private
+
+      attr_reader :package_file
+
+      def process_gem
+        return false unless package_file
+
+        try_obtain_lease do
+          package.transaction do
+            rename_package_and_set_version
+            rename_package_file
+            ::Packages::Rubygems::MetadataExtractionService.new(package, gemspec).execute
+            ::Packages::Rubygems::CreateGemspecService.new(package, gemspec).execute
+            ::Packages::Rubygems::CreateDependenciesService.new(package, gemspec).execute
+            cleanup_temp_package
+          end
+        end
+
+        true
+      end
+
+      def rename_package_and_set_version
+        package.update!(
+          name: gemspec.name,
+          version: gemspec.version,
+          status: :default
+        )
+      end
+
+      def rename_package_file
+        # Updating file_name updates the path where the file is stored.
+        # We must pass the file again so that CarrierWave can handle the update
+        package_file.update!(
+          file_name: "#{gemspec.name}-#{gemspec.version}.gem",
+          file: package_file.file,
+          package_id: package.id
+        )
+      end
+
+      def cleanup_temp_package
+        temp_package.destroy if package.id != temp_package.id
+      end
+
+      def gemspec
+        strong_memoize(:gemspec) do
+          gem.spec
+        end
+      end
+
+      def success
+        ServiceResponse.success(payload: { package: package })
+      end
+
+      def error(message)
+        ServiceResponse.error(message: message)
+      end
+
+      def temp_package
+        strong_memoize(:temp_package) do
+          package_file.package
+        end
+      end
+
+      def package
+        strong_memoize(:package) do
+          # if package with name/version already exists, use that package
+          package = temp_package.project
+                                .packages
+                                .rubygems
+                                .with_name(gemspec.name)
+                                .with_version(gemspec.version.to_s)
+                                .last
+          package || temp_package
+        end
+      end
+
+      def gem
+        # use_file will set an exclusive lease on the file for as long as
+        # the resulting gem object is being used. This means we are not
+        # able to rename the package_file while also using the gem object.
+        # We need to use a separate AR object to create the gem file to allow
+        # `package_file` to be free for update so we re-find the file here.
+        Packages::PackageFile.find(package_file.id).file.use_file do |file_path|
+          Gem::Package.new(File.open(file_path))
+        end
+      rescue
+        raise ExtractionError.new('Unable to read gem file')
+      end
+
+      # used by ExclusiveLeaseGuard
+      def lease_key
+        "packages:rubygems:process_gem_service:package:#{package.id}"
+      end
+
+      # used by ExclusiveLeaseGuard
+      def lease_timeout
+        DEFAULT_LEASE_TIMEOUT
+      end
+    end
+  end
+end

app/workers/all_queues.yml

@@ -1107,6 +1107,14 @@
   :weight: 1
   :idempotent:
   :tags: []
+- :name: package_repositories:packages_rubygems_extraction
+  :feature_category: :package_registry
+  :has_external_dependencies:
+  :urgency: :low
+  :resource_boundary: :unknown
+  :weight: 1
+  :idempotent: true
+  :tags: []
 - :name: pipeline_background:archive_trace
   :feature_category: :continuous_integration
   :has_external_dependencies:

app/workers/packages/rubygems/extraction_worker.rb

+# frozen_string_literal: true
+
+module Packages
+  module Rubygems
+    class ExtractionWorker # rubocop:disable Scalability/IdempotentWorker
+      include ApplicationWorker
+
+      queue_namespace :package_repositories
+      feature_category :package_registry
+      deduplicate :until_executing
+
+      idempotent!
+
+      def perform(package_file_id)
+        package_file = ::Packages::PackageFile.find_by_id(package_file_id)
+
+        return unless package_file
+
+        ::Packages::Rubygems::ProcessGemService.new(package_file).execute
+
+      rescue ::Packages::Rubygems::ProcessGemService::ExtractionError => e
+        Gitlab::ErrorTracking.log_exception(e, project_id: package_file.project_id)
+        package_file.package.destroy!
+      end
+    end
+  end
+end

changelogs/unreleased/301175-gemfile-extraction-service.yml

+---
+title: Update RubyGems metadata constraints and add gem metadata extraction
+merge_request: 53673
+author:
+type: changed

db/migrate/20210223230600_update_rubygems_metadata_metadata.rb

+# frozen_string_literal: true
+
+class UpdateRubygemsMetadataMetadata < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    remove_text_limit :packages_rubygems_metadata, :metadata
+    add_text_limit :packages_rubygems_metadata, :metadata, 30000
+  end
+
+  def down
+    remove_text_limit :packages_rubygems_metadata, :metadata
+    add_text_limit :packages_rubygems_metadata, :metadata, 255, validate: false
+  end
+end

db/schema_migrations/20210223230600

+18d64af208338baec9d56a6ac9d7fc35aaeb79d3f8036d3cf5bcc72879827299
\ No newline at end of file

db/structure.sql

@@ -15658,7 +15658,7 @@ CREATE TABLE packages_rubygems_metadata (
     CONSTRAINT check_b7b296b420 CHECK ((char_length(author) <= 255)),
     CONSTRAINT check_bf16b21a47 CHECK ((char_length(rdoc_options) <= 255)),
     CONSTRAINT check_ca641a3354 CHECK ((char_length(required_ruby_version) <= 255)),
-    CONSTRAINT check_ea02f4800f CHECK ((char_length(metadata) <= 255)),
+    CONSTRAINT check_ea02f4800f CHECK ((char_length(metadata) <= 30000)),
     CONSTRAINT check_f76bad1a9a CHECK ((char_length(require_paths) <= 255))
 );
 

lib/api/rubygem_packages.rb

@@ -99,6 +99,8 @@ module API
 
             track_package_event('push_package', :rubygems)
 
+            package_file = nil
+
             ActiveRecord::Base.transaction do
               package = ::Packages::CreateTemporaryPackageService.new(
                 user_project, current_user, declared_params.merge(build: current_authenticated_job)
@@ -109,12 +111,18 @@ module API
                 file_name: PACKAGE_FILENAME
               }
 
-              ::Packages::CreatePackageFileService.new(
+              package_file = ::Packages::CreatePackageFileService.new(
                 package, file_params.merge(build: current_authenticated_job)
               ).execute
             end
 
-            created!
+            if package_file
+              ::Packages::Rubygems::ExtractionWorker.perform_async(package_file.id) # rubocop:disable CodeReuse/Worker
+
+              created!
+            else
+              bad_request!('Package creation failed')
+            end
           rescue ObjectStorage::RemoteStoreError => e
             Gitlab::ErrorTracking.track_exception(e, extra: { file_name: params[:file_name], project_id: user_project.id })
 

locale/gitlab.pot

@@ -22051,6 +22051,9 @@ msgstr ""
 msgid "PackageRegistry|Remove package"
 msgstr ""
 
+msgid "PackageRegistry|RubyGems"
+msgstr ""
+
 msgid "PackageRegistry|Settings for Maven packages"
 msgstr ""
 
@@ -22147,6 +22150,9 @@ msgstr ""
 msgid "PackageType|PyPI"
 msgstr ""
 
+msgid "PackageType|RubyGems"
+msgstr ""
+
 msgid "PackageType|npm"
 msgstr ""
 

spec/factories/packages.rb

@@ -36,8 +36,8 @@ FactoryBot.define do
       package_type { :rubygems }
 
       after :create do |package|
-        create :package_file, :gem, package: package
-        create :package_file, :gemspec, package: package
+        create :package_file, package.processing? ? :unprocessed_gem : :gem, package: package
+        create :package_file, :gemspec, package: package unless package.processing?
       end
 
       trait(:with_metadatum) do

spec/factories/packages/package_file.rb

@@ -247,6 +247,14 @@ FactoryBot.define do
       size { 4.kilobytes }
     end
 
+    trait(:unprocessed_gem) do
+      package
+      file_fixture { 'spec/fixtures/packages/rubygems/package.gem' }
+      file_name { 'package.gem' }
+      file_sha1 { '5fe852b2a6abd96c22c11fa1ff2fb19d9ce58b57' }
+      size { 4.kilobytes }
+    end
+
     trait(:gemspec) do
       package
       file_fixture { 'spec/fixtures/packages/rubygems/package.gemspec' }

spec/fixtures/api/schemas/graphql/packages/package_details.json

@@ -23,7 +23,7 @@
     },
     "packageType": {
       "type": ["string"],
-      "enum": ["MAVEN", "NPM", "CONAN", "NUGET", "PYPI", "COMPOSER", "GENERIC", "GOLANG", "DEBIAN"]
+      "enum": ["MAVEN", "NPM", "CONAN", "NUGET", "PYPI", "COMPOSER", "GENERIC", "GOLANG", "RUBYGEMS", "DEBIAN"]
     },
     "tags": {
       "type": "object",

spec/fixtures/packages/rubygems/package.gemspec

 # frozen_string_literal: true
 
 Gem::Specification.new do |s|
-  s.name = %q{package}
-  s.authors = ["Tanuki Steve"]
-  s.version = "0.0.1"
-  s.date = %q{2011-09-29}
-  s.summary = %q{package is the best}
-  s.files = [
-    "lib/package.rb"
-  ]
+  s.name = 'package'
+  s.authors = ['Tanuki Steve', 'Hal 9000']
+  s.author = 'Tanuki Steve'
+  s.version = '0.0.1'
+  s.date = '2011-09-29'
+  s.summary = 'package is the best'
+  s.files = ['lib/test_gem.rb']
+  s.require_paths = ['lib']
+
+  s.description = 'A test package for GitLab.'
+  s.email = 'tanuki@not_real.com'
+  s.homepage = 'https://gitlab.com/ruby-co/my-package'
+  s.license = 'MIT'
+
+  s.metadata = {
+    'bug_tracker_uri' => 'https://gitlab.com/ruby-co/my-package/issues',
+    'changelog_uri' => 'https://gitlab.com/ruby-co/my-package/CHANGELOG.md',
+    'documentation_uri' => 'https://gitlab.com/ruby-co/my-package/docs',
+    'mailing_list_uri' => 'https://gitlab.com/ruby-co/my-package/mailme',
+    'source_code_uri' => 'https://gitlab.com/ruby-co/my-package'
+  }
+
+  s.bindir = 'bin'
+  s.executables = ['rake']
+  s.extensions = ['ext/foo.rb']
+  s.extra_rdoc_files = ['README.md', 'doc/userguide.md']
+  s.platform = Gem::Platform::RUBY
+  s.post_install_message = 'Installed, thank you!'
+  s.rdoc_options = ['--main', 'README.md']
   s.required_ruby_version = '>= 2.7.0'
-  s.rubygems_version = '>= 1.8.11'
-  s.require_paths = ["lib"]
+  s.required_rubygems_version = '>= 1.8.11'
+  s.requirements = 'A high powered server or calculator'
+  s.rubygems_version = '1.8.09'
+
+  s.add_dependency 'dependency_1', '~> 1.2.3'
+  s.add_dependency 'dependency_2', '3.0.0'
+  s.add_dependency 'dependency_3', '>= 1.0.0'
+  s.add_dependency 'dependency_4'
 end

spec/frontend/packages/details/store/getters_spec.js

@@ -27,6 +27,7 @@ import {
   mockPipelineInfo,
   mavenPackage as packageWithoutBuildInfo,
   pypiPackage,
+  rubygemsPackage,
 } from '../../mock_data';
 import {
   generateMavenCommand,
@@ -104,6 +105,7 @@ describe('Getters PackageDetails Store', () => {
       ${npmPackage}              | ${'npm'}
       ${nugetPackage}            | ${'NuGet'}
       ${pypiPackage}             | ${'PyPI'}
+      ${rubygemsPackage}         | ${'RubyGems'}
     `(`package type`, ({ packageEntity, expectedResult }) => {
       beforeEach(() => setupState({ packageEntity }));
 

spec/frontend/packages/mock_data.js

@@ -134,6 +134,23 @@ export const nugetPackage = {
   },
 };
 
+export const rubygemsPackage = {
+  created_at: '2015-12-10',
+  id: 4,
+  name: 'RubyGem1',
+  package_files: [],
+  package_type: 'rubygems',
+  project_id: 1,
+  tags: [],
+  updated_at: '2015-12-10',
+  version: '1.0.0',
+  rubygems_metadatum: {
+    author: 'Fake Name',
+    summary: 'My gem',
+    email: 'tanuki@fake.com',
+  },
+};
+
 export const pypiPackage = {
   created_at: '2015-12-10',
   id: 5,

spec/frontend/packages/shared/utils_spec.js

@@ -38,6 +38,7 @@ describe('Packages shared utils', () => {
       ${'npm'}      | ${'npm'}
       ${'nuget'}    | ${'NuGet'}
       ${'pypi'}     | ${'PyPI'}
+      ${'rubygems'} | ${'RubyGems'}
       ${'composer'} | ${'Composer'}
       ${'foo'}      | ${null}
     `(`package type`, ({ packageType, expectedResult }) => {

spec/services/packages/rubygems/create_dependencies_service_spec.rb

+# frozen_string_literal: true
+require 'spec_helper'
+
+RSpec.describe Packages::Rubygems::CreateDependenciesService do
+  include RubygemsHelpers
+
+  let_it_be(:package) { create(:rubygems_package) }
+  let_it_be(:package_file) { create(:package_file, :gem) }
+  let_it_be(:gem) { gem_from_file(package_file.file) }
+  let_it_be(:gemspec) { gem.spec }
+
+  let(:service) { described_class.new(package, gemspec) }
+
+  describe '#execute' do
+    subject { service.execute }
+
+    it 'creates dependencies', :aggregate_failures do
+      expect { subject }.to change { Packages::Dependency.count }.by(4)
+
+      gemspec.dependencies.each do |dependency|
+        persisted_dependency = Packages::Dependency.find_by(name: dependency.name)
+
+        expect(persisted_dependency.version_pattern).to eq dependency.requirement.to_s
+      end
+    end
+
+    it 'links dependencies to the package' do
+      expect { subject }.to change { package.dependency_links.count }.by(4)
+
+      expect(package.dependency_links.first).to be_dependencies
+    end
+  end
+end

spec/services/packages/rubygems/create_gemspec_service_spec.rb

+# frozen_string_literal: true
+require 'spec_helper'
+
+RSpec.describe Packages::Rubygems::CreateGemspecService do
+  include RubygemsHelpers
+
+  let_it_be(:package) { create(:rubygems_package) }
+  let_it_be(:package_file) { create(:package_file, :gem) }
+  let_it_be(:gem) { gem_from_file(package_file.file) }
+  let_it_be(:gemspec) { gem.spec }
+
+  let(:service) { described_class.new(package, gemspec) }
+
+  describe '#execute' do
+    subject { service.execute }
+
+    it 'creates a new package file', :aggregate_failures do
+      expect { subject }.to change { package.package_files.count }.by(1)
+
+      gemspec_file = package.package_files.find_by(file_name: "#{gemspec.name}.gemspec")
+      expect(gemspec_file.file).not_to be_nil
+      expect(gemspec_file.size).not_to be_nil
+      expect(gemspec_file.file_md5).not_to be_nil
+      expect(gemspec_file.file_sha1).not_to be_nil
+      expect(gemspec_file.file_sha256).not_to be_nil
+    end
+  end
+end

spec/services/packages/rubygems/metadata_extraction_service_spec.rb

+# frozen_string_literal: true
+require 'spec_helper'
+require 'rubygems/package'
+
+RSpec.describe Packages::Rubygems::MetadataExtractionService do
+  include RubygemsHelpers
+
+  let_it_be(:package) { create(:rubygems_package) }
+  let_it_be(:package_file) { create(:package_file, :gem) }
+  let_it_be(:gem) { gem_from_file(package_file.file) }
+  let_it_be(:gemspec) { gem.spec }
+
+  let(:service) { described_class.new(package, gemspec) }
+
+  describe '#execute' do
+    subject { service.execute }
+
+    it 'creates the metadata' do
+      expect { subject }.to change { Packages::Rubygems::Metadatum.count }.by(1)
+    end
+
+    it 'stores the metadata', :aggregate_failures do
+      subject
+
+      metadata = package.rubygems_metadatum
+
+      expect(metadata.authors).to eq(gemspec.authors.to_json)
+      expect(metadata.files).to eq(gemspec.files.to_json)
+      expect(metadata.summary).to eq(gemspec.summary)
+      expect(metadata.description).to eq(gemspec.description)
+      expect(metadata.email).to eq(gemspec.email)
+      expect(metadata.homepage).to eq(gemspec.homepage)
+      expect(metadata.licenses).to eq(gemspec.licenses.to_json)
+      expect(metadata.metadata).to eq(gemspec.metadata.to_json)
+      expect(metadata.author).to eq(gemspec.author)
+      expect(metadata.bindir).to eq(gemspec.bindir)
+      expect(metadata.executables).to eq(gemspec.executables.to_json)
+      expect(metadata.extensions).to eq(gemspec.extensions.to_json)
+      expect(metadata.extra_rdoc_files).to eq(gemspec.extra_rdoc_files.to_json)
+      expect(metadata.platform).to eq(gemspec.platform)
+      expect(metadata.post_install_message).to eq(gemspec.post_install_message)
+      expect(metadata.rdoc_options).to eq(gemspec.rdoc_options.to_json)
+      expect(metadata.require_paths).to eq(gemspec.require_paths.to_json)
+      expect(metadata.required_ruby_version).to eq(gemspec.required_ruby_version.to_s)
+      expect(metadata.required_rubygems_version).to eq(gemspec.required_rubygems_version.to_s)
+      expect(metadata.requirements).to eq(gemspec.requirements.to_json)
+      expect(metadata.rubygems_version).to eq(gemspec.rubygems_version)
+    end
+  end
+end

spec/services/packages/rubygems/process_gem_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Packages::Rubygems::ProcessGemService do
+  include ExclusiveLeaseHelpers
+  include RubygemsHelpers
+
+  let_it_be_with_reload(:package) { create(:rubygems_package, :processing, name: 'temp_name', version: '0.0.0') }
+
+  let(:package_file) { create(:package_file, :unprocessed_gem, package: package) }
+  let(:gem) { gem_from_file(package_file.file) }
+  let(:gemspec) { gem.spec }
+  let(:service) { described_class.new(package_file) }
+
+  describe '#execute' do
+    subject { service.execute }
+
+    context 'no gem file', :aggregate_failures do
+      let(:package_file) { nil }
+
+      it 'returns an error' do
+        expect(subject.error?).to be(true)
+        expect(subject.message).to eq('Gem was not processed')
+      end
+    end
+
+    context 'success' do
+      let(:sub_service) { double }
+
+      before do
+        expect(Packages::Rubygems::MetadataExtractionService).to receive(:new).with(package, gemspec).and_return(sub_service)
+        expect(Packages::Rubygems::CreateGemspecService).to receive(:new).with(package, gemspec).and_return(sub_service)
+        expect(Packages::Rubygems::CreateDependenciesService).to receive(:new).with(package, gemspec).and_return(sub_service)
+
+        expect(sub_service).to receive(:execute).exactly(3).times.and_return(true)
+      end
+
+      it 'returns successfully', :aggregate_failures do
+        result = subject
+
+        expect(result.success?).to be true
+        expect(result.payload[:package]).to eq(package)
+      end
+
+      it 'updates the package name and version', :aggregate_failures do
+        expect(package.name).to eq('temp_name')
+        expect(package.version).to eq('0.0.0')
+        expect(package).to be_processing
+
+        subject
+
+        expect(package.reload.name).to eq('package')
+        expect(package.version).to eq('0.0.1')
+        expect(package).to be_default
+      end
+
+      it 'updates the package file name', :aggregate_failures do
+        expect(package_file.file_name).to eq('package.gem')
+
+        subject
+
+        expect(package_file.reload.file_name).to eq('package-0.0.1.gem')
+      end
+    end
+
+    context 'when the package already exists' do
+      let_it_be(:existing_package) { create(:rubygems_package, name: 'package', version: '0.0.1', project: package.project) }
+
+      let(:sub_service) { double }
+
+      before do
+        expect(Packages::Rubygems::MetadataExtractionService).to receive(:new).with(existing_package, gemspec).and_return(sub_service)
+        expect(Packages::Rubygems::CreateGemspecService).to receive(:new).with(existing_package, gemspec).and_return(sub_service)
+        expect(Packages::Rubygems::CreateDependenciesService).to receive(:new).with(existing_package, gemspec).and_return(sub_service)
+
+        expect(sub_service).to receive(:execute).exactly(3).times.and_return(true)
+      end
+
+      it 'assigns the package_file to the existing package and deletes the temporary package', :aggregate_failures do
+        expect(package).to receive(:destroy)
+
+        expect { subject }.to change { existing_package.package_files.count }.by(1)
+
+        expect(package_file.reload.package).to eq(existing_package)
+      end
+    end
+
+    context 'sub-service failure' do
+      before do
+        expect(Packages::Rubygems::MetadataExtractionService).to receive(:new).with(package, gemspec).and_raise(::Packages::Rubygems::ProcessGemService::ExtractionError.new('failure'))
+      end
+
+      it 'returns an error' do
+        expect { subject }.to raise_error(::Packages::Rubygems::ProcessGemService::ExtractionError, 'failure')
+      end
+    end
+
+    context 'bad gem file' do
+      before do
+        expect(Gem::Package).to receive(:new).and_raise(ArgumentError)
+      end
+
+      it 'returns an error' do
+        expect { subject }.to raise_error(::Packages::Rubygems::ProcessGemService::ExtractionError, 'Unable to read gem file')
+      end
+    end
+
+    context 'without obtaining an exclusive lease' do
+      let(:lease_key) { "packages:rubygems:process_gem_service:package:#{package.id}" }
+
+      before do
+        stub_exclusive_lease_taken(lease_key, timeout: 1.hour)
+      end
+
+      it 'does not perform the services', :aggregate_failures do
+        # The #use_file call triggers a separate lease on the package file being opened
+        # for use with the gem. We don't want to test that here, so we allow the call to proceed
+        expect(Gitlab::ExclusiveLease).to receive(:new).with("object_storage_migrate:Packages::PackageFile:#{package_file.id}", anything).and_call_original
+
+        expect(Packages::Rubygems::MetadataExtractionService).not_to receive(:new)
+        expect(Packages::Rubygems::CreateGemspecService).not_to receive(:new)
+        expect(Packages::Rubygems::CreateDependenciesService).not_to receive(:new)
+
+        subject
+
+        expect(package.reload.name).to eq('temp_name')
+        expect(package.version).to eq('0.0.0')
+        expect(package).to be_processing
+        expect(package_file.reload.file_name).to eq('package.gem')
+      end
+    end
+  end
+end

spec/support/helpers/rubygems_helpers.rb

+# frozen_string_literal: true
+
+module RubygemsHelpers
+  def gem_from_file(file)
+    full_path = File.expand_path(
+      Rails.root.join('spec', 'fixtures', 'packages', 'rubygems', file.filename)
+    )
+
+    Gem::Package.new(File.open(full_path))
+  end
+end

spec/support/shared_examples/requests/api/rubygems_packages_shared_examples.rb

@@ -43,6 +43,8 @@ end
 RSpec.shared_examples 'process rubygems upload' do |user_type, status, add_member = true|
   RSpec.shared_examples 'creates rubygems package files' do
     it 'creates package files', :aggregate_failures do
+      expect(::Packages::Rubygems::ExtractionWorker).to receive(:perform_async).once
+
       expect { subject }
           .to change { project.packages.count }.by(1)
           .and change { Packages::PackageFile.count }.by(1)
@@ -51,6 +53,17 @@ RSpec.shared_examples 'process rubygems upload' do |user_type, status, add_membe
       package_file = project.packages.last.package_files.reload.last
       expect(package_file.file_name).to eq('package.gem')
     end
+
+    it 'returns bad request if package creation fails' do
+      file_service = double('file_service', execute: nil)
+
+      expect(::Packages::CreatePackageFileService).to receive(:new).and_return(file_service)
+      expect(::Packages::Rubygems::ExtractionWorker).not_to receive(:perform_async)
+
+      subject
+
+      expect(response).to have_gitlab_http_status(:bad_request)
+    end
   end
 
   context "for user type #{user_type}" do

spec/workers/packages/rubygems/extraction_worker_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Packages::Rubygems::ExtractionWorker, type: :worker do
+  describe '#perform' do
+    let_it_be(:package) { create(:rubygems_package) }
+
+    let(:package_file) { package.package_files.first }
+    let(:package_file_id) { package_file.id }
+    let(:package_name) { 'TempProject.TempPackage' }
+    let(:package_version) { '1.0.0' }
+    let(:job_args) { package_file_id }
+
+    subject { described_class.new.perform(*job_args) }
+
+    include_examples 'an idempotent worker' do
+      it 'processes the gem', :aggregate_failures do
+        expect { subject }
+          .to change { Packages::Package.count }.by(0)
+          .and change { Packages::PackageFile.count }.by(2)
+
+        expect(Packages::Package.last.id).to be(package.id)
+        expect(package.name).not_to be(package_name)
+      end
+    end
+
+    it 'handles a processing failure', :aggregate_failures do
+      expect(::Packages::Rubygems::ProcessGemService).to receive(:new)
+        .and_raise(::Packages::Rubygems::ProcessGemService::ExtractionError)
+
+      expect(Gitlab::ErrorTracking).to receive(:log_exception).with(
+        instance_of(::Packages::Rubygems::ProcessGemService::ExtractionError),
+        project_id: package.project_id
+      )
+
+      expect { subject }
+        .to change { Packages::Package.count }.by(-1)
+        .and change { Packages::PackageFile.count }.by(-2)
+    end
+
+    context 'returns when there is no package file' do
+      let(:package_file_id) { 999999 }
+
+      it 'returns without action' do
+        expect(::Packages::Rubygems::ProcessGemService).not_to receive(:new)
+
+        expect { subject }
+          .to change { Packages::Package.count }.by(0)
+          .and change { Packages::PackageFile.count }.by(0)
+      end
+    end
+  end
+end