Composer cache task

Rake task to build the composer cache files.
Useful for old packages or for recovery of the cache.

changelogs/unreleased/290288-composer-cache-build-pages-task.yml

+---
+title: Add composer cache rake task
+merge_request: 53772
+author:
+type: added

lib/tasks/gitlab/packages/composer.rake

+# frozen_string_literal: true
+
+require 'logger'
+
+desc "GitLab | Packages | Build composer cache"
+namespace :gitlab do
+  namespace :packages do
+    task build_composer_cache: :environment do
+      logger = Logger.new(STDOUT)
+      logger.info('Starting to build composer cache files')
+
+      ::Packages::Package.composer.find_in_batches do |packages|
+        packages.group_by { |pkg| [pkg.project_id, pkg.name] }.each do |(project_id, name), packages|
+          logger.info("Building cache for #{project_id} -> #{name}")
+          Gitlab::Composer::Cache.new(project: packages.first.project, name: name).execute
+        end
+      end
+    end
+  end
+end

spec/tasks/gitlab/packages/composer_rake_spec.rb

+# frozen_string_literal: true
+
+require 'rake_helper'
+
+RSpec.describe 'gitlab:packages:build_composer_cache namespace rake task' do
+  let_it_be(:package_name) { 'sample-project' }
+  let_it_be(:package_name2) { 'sample-project2' }
+  let_it_be(:json) { { 'name' => package_name } }
+  let_it_be(:json2) { { 'name' => package_name2 } }
+  let_it_be(:group) { create(:group) }
+  let_it_be(:project) { create(:project, :custom_repo, files: { 'composer.json' => json.to_json }, group: group) }
+  let_it_be(:project2) { create(:project, :custom_repo, files: { 'composer.json' => json2.to_json }, group: group) }
+  let!(:package) { create(:composer_package, :with_metadatum, project: project, name: package_name, version: '1.0.0', json: json) }
+  let!(:package2) { create(:composer_package, :with_metadatum, project: project, name: package_name, version: '2.0.0', json: json) }
+  let!(:package3) { create(:composer_package, :with_metadatum, project: project2, name: package_name2, version: '3.0.0', json: json2) }
+
+  before :all do
+    Rake.application.rake_require 'tasks/gitlab/packages/composer'
+  end
+
+  subject do
+    run_rake_task("gitlab:packages:build_composer_cache")
+  end
+
+  it 'generates the cache files' do
+    expect { subject }.to change { Packages::Composer::CacheFile.count }.by(2)
+  end
+end