Add Debian FindOrCreatePackageService

app/services/packages/debian/find_or_create_package_service.rb

+# frozen_string_literal: true
+
+module Packages
+  module Debian
+    class FindOrCreatePackageService < ::Packages::CreatePackageService
+      include Gitlab::Utils::StrongMemoize
+
+      def execute
+        package = project.packages
+                         .debian
+                         .with_name(params[:name])
+                         .with_version(params[:version])
+                         .with_debian_codename(params[:distribution_name])
+                         .first
+
+        package ||= create_package!(
+          :debian,
+          debian_publication_attributes: { distribution_id: distribution.id }
+        )
+
+        ServiceResponse.success(payload: { package: package })
+      end
+
+      private
+
+      def distribution
+        strong_memoize(:distribution) do
+          Packages::Debian::DistributionsFinder.new(project, codename: params[:distribution_name]).execute.last!
+        end
+      end
+    end
+  end
+end

spec/services/packages/debian/find_or_create_package_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Packages::Debian::FindOrCreatePackageService do
+  let_it_be(:distribution) { create(:debian_project_distribution) }
+  let_it_be(:project) { distribution.project }
+  let_it_be(:user) { create(:user) }
+  let(:params) { { name: 'foo', version: '1.0+debian', distribution_name: distribution.codename } }
+
+  subject(:service) { described_class.new(project, user, params) }
+
+  describe '#execute' do
+    subject { service.execute }
+
+    let(:package) { subject.payload[:package] }
+
+    context 'run once' do
+      it 'creates a new package', :aggregate_failures do
+        expect { subject }.to change { ::Packages::Package.count }.by(1)
+        expect(subject).to be_success
+
+        expect(package).to be_valid
+        expect(package.project_id).to eq(project.id)
+        expect(package.creator_id).to eq(user.id)
+        expect(package.name).to eq('foo')
+        expect(package.version).to eq('1.0+debian')
+        expect(package).to be_debian
+        expect(package.debian_publication.distribution).to eq(distribution)
+      end
+    end
+
+    context 'run twice' do
+      let(:subject2) { service.execute }
+
+      let(:package2) { service.execute.payload[:package] }
+
+      it 'returns the same object' do
+        expect { subject }.to change { ::Packages::Package.count }.by(1)
+        expect { package2 }.not_to change { ::Packages::Package.count }
+
+        expect(package2.id).to eq(package.id)
+      end
+    end
+
+    context 'with non-existing distribution' do
+      let(:params) { { name: 'foo', version: '1.0+debian', distribution_name: 'not-existing' } }
+
+      it 'raises ActiveRecord::RecordNotFound' do
+        expect { package }.to raise_error(ActiveRecord::RecordNotFound)
+      end
+    end
+  end
+end