1 files changed, 46 insertions, 0 deletions
diff --git a/lib/gitlab/kubernetes/ingress.rb b/lib/gitlab/kubernetes/ingress.rb
new file mode 100644
index 00000000000..c5643dd670a
--- /dev/null
+++ b/lib/gitlab/kubernetes/ingress.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Kubernetes
+    class Ingress
+      include Gitlab::Utils::StrongMemoize
+
+      # Canary Ingress Annotations https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/annotations/#canary
+      ANNOTATION_KEY_CANARY = 'nginx.ingress.kubernetes.io/canary'
+      ANNOTATION_KEY_CANARY_WEIGHT = 'nginx.ingress.kubernetes.io/canary-weight'
+
+      def initialize(attributes = {})
+        @attributes = attributes
+      end
+
+      def canary?
+        strong_memoize(:is_canary) do
+          annotations.any? do |key, value|
+            key == ANNOTATION_KEY_CANARY && value == 'true'
+          end
+        end
+      end
+
+      def canary_weight
+        return unless canary?
+        return unless annotations.key?(ANNOTATION_KEY_CANARY_WEIGHT)
+
+        annotations[ANNOTATION_KEY_CANARY_WEIGHT].to_i
+      end
+
+      def name
+        metadata['name']
+      end
+
+      private
+
+      def metadata
+        @attributes.fetch('metadata', {})
+      end
+
+      def annotations
+        metadata.fetch('annotations', {})
+      end
+    end
+  end
+end