Extract processable metadata to a separate concern

We extracted implementation of build/bridge metadata attributes to a
separate concern, because in EE `Ci::Bridge` also has metadata
attributes, and we want to build abstraction for storing values in build
metadata table.

1 files changed, 69 insertions, 0 deletions

diff --git a/app/models/concerns/ci/metadatable.rb b/app/models/concerns/ci/metadatable.rb
new file mode 100644
index 00000000000..9eed9492b37
--- /dev/null
+++ b/app/models/concerns/ci/metadatable.rb
@@ -0,0 +1,69 @@
+# frozen_string_literal: true
+
+module Ci
+  ##
+  # This module implements methods that need to read and write
+  # metadata for CI/CD entities.
+  #
+  module Metadatable
+    extend ActiveSupport::Concern
+
+    included do
+      has_one :metadata, class_name: 'Ci::BuildMetadata',
+                         foreign_key: :build_id,
+                         inverse_of: :build,
+                         autosave: true
+
+      delegate :timeout, to: :metadata, prefix: true, allow_nil: true
+      before_create :ensure_metadata
+    end
+
+    def ensure_metadata
+      metadata || build_metadata(project: project)
+    end
+
+    def degenerated?
+      self.options.blank?
+    end
+
+    def degenerate!
+      self.class.transaction do
+        self.update!(options: nil, yaml_variables: nil)
+        self.metadata&.destroy
+      end
+    end
+
+    def options
+      read_metadata_attribute(:options, :config_options, {})
+    end
+
+    def yaml_variables
+      read_metadata_attribute(:yaml_variables, :config_variables, [])
+    end
+
+    def options=(value)
+      write_metadata_attribute(:options, :config_options, value)
+    end
+
+    def yaml_variables=(value)
+      write_metadata_attribute(:yaml_variables, :config_variables, value)
+    end
+
+    private
+
+    def read_metadata_attribute(legacy_key, metadata_key, default_value = nil)
+      read_attribute(legacy_key) || metadata&.read_attribute(metadata_key) || default_value
+    end
+
+    def write_metadata_attribute(legacy_key, metadata_key, value)
+      # save to metadata or this model depending on the state of feature flag
+      if Feature.enabled?(:ci_build_metadata_config)
+        ensure_metadata.write_attribute(metadata_key, value)
+        write_attribute(legacy_key, nil)
+      else
+        write_attribute(legacy_key, value)
+        metadata&.write_attribute(metadata_key, nil)
+      end
+    end
+  end
+end