1 files changed, 113 insertions, 0 deletions
diff --git a/lib/quality/helm3_client.rb b/lib/quality/helm3_client.rb
new file mode 100644
index 00000000000..f5eb0834386
--- /dev/null
+++ b/lib/quality/helm3_client.rb
@@ -0,0 +1,113 @@
+# frozen_string_literal: true
+
+require 'time'
+require_relative '../gitlab/popen' unless defined?(Gitlab::Popen)
+
+module Quality
+  class Helm3Client
+    CommandFailedError = Class.new(StandardError)
+
+    attr_reader :namespace
+
+    RELEASE_JSON_ATTRIBUTES = %w[name revision updated status chart app_version namespace].freeze
+    PAGINATION_SIZE = 256 # Default helm list pagination size
+
+    Release = Struct.new(:name, :revision, :last_update, :status, :chart, :app_version, :namespace) do
+      def revision
+        @revision ||= self[:revision].to_i
+      end
+
+      def status
+        @status ||= self[:status].downcase
+      end
+
+      def last_update
+        @last_update ||= Time.parse(self[:last_update])
+      end
+    end
+
+    # A single page of data and the corresponding page number.
+    Page = Struct.new(:releases, :number)
+
+    def initialize(namespace:, tiller_namespace: nil)
+      @namespace = namespace
+    end
+
+    def releases(args: [])
+      each_release(args)
+    end
+
+    def delete(release_name:)
+      run_command([
+        'uninstall',
+        %(--namespace "#{namespace}"),
+        release_name
+      ])
+    end
+
+    private
+
+    def run_command(command)
+      final_command = ['helm', *command].join(' ')
+      puts "Running command: `#{final_command}`" # rubocop:disable Rails/Output
+
+      result = Gitlab::Popen.popen_with_detail([final_command])
+
+      if result.status.success?
+        result.stdout.chomp.freeze
+      else
+        raise CommandFailedError, "The `#{final_command}` command failed (status: #{result.status}) with the following error:\n#{result.stderr}"
+      end
+    end
+
+    def raw_releases(page, args = [])
+      command = [
+        'list',
+        %(--namespace "#{namespace}"),
+        %(--max #{PAGINATION_SIZE}),
+        %(--offset #{PAGINATION_SIZE * page}),
+        %(--output json),
+        *args
+      ]
+      releases = JSON.parse(run_command(command))
+
+      releases.map do |release|
+        Release.new(*release.values_at(*RELEASE_JSON_ATTRIBUTES))
+      end
+    rescue JSON::ParserError => ex
+      puts "Ignoring this JSON parsing error: #{ex}" # rubocop:disable Rails/Output
+      []
+    end
+
+    # Fetches data from Helm and yields a Page object for every page
+    # of data, without loading all of them into memory.
+    #
+    # method - The Octokit method to use for getting the data.
+    # args - Arguments to pass to the `helm list` command.
+    def each_releases_page(args, &block)
+      return to_enum(__method__, args) unless block_given?
+
+      page = 0
+      final_args = args.dup
+
+      begin
+        collection = raw_releases(page, final_args)
+
+        yield Page.new(collection, page += 1)
+      end while collection.any?
+    end
+
+    # Iterates over all of the releases.
+    #
+    # args - Any arguments to pass to the `helm list` command.
+    def each_release(args, &block)
+      return to_enum(__method__, args) unless block_given?
+
+      each_releases_page(args) do |page|
+        page.releases.each do |release|
+          yield release
+        end
+      end
+    end
+  end
+end