Add Container Registry API

This includes a set of APIs to manipulate container registry.
This includes also an ability to delete tags based on requested
criteria, like keep-last-n, matching-name, older-than.

1 files changed, 27 insertions, 11 deletions

diff --git a/lib/container_registry/tag.rb b/lib/container_registry/tag.rb
index 8633e764f90..ef41dc560c9 100644
--- a/lib/container_registry/tag.rb
+++ b/lib/container_registry/tag.rb
@@ -2,6 +2,8 @@
 
 module ContainerRegistry
   class Tag
+    include Gitlab::Utils::StrongMemoize
+
     attr_reader :repository, :name
 
     delegate :registry, :client, to: :repository
@@ -15,6 +17,10 @@ module ContainerRegistry
       manifest.present?
     end
 
+    def latest?
+      name == "latest"
+    end
+
     def v1?
       manifest && manifest['schemaVersion'] == 1
     end
@@ -24,7 +30,9 @@ module ContainerRegistry
     end
 
     def manifest
-      @manifest ||= client.repository_manifest(repository.path, name)
+      strong_memoize(:manifest) do
+        client.repository_manifest(repository.path, name)
+      end
     end
 
     def path
@@ -42,36 +50,44 @@ module ContainerRegistry
     end
 
     def digest
-      @digest ||= client.repository_tag_digest(repository.path, name)
+      strong_memoize(:digest) do
+        client.repository_tag_digest(repository.path, name)
+      end
     end
 
     def config_blob
-      return @config_blob if defined?(@config_blob)
       return unless manifest && manifest['config']
 
-      @config_blob = repository.blob(manifest['config'])
+      strong_memoize(:config_blob) do
+        repository.blob(manifest['config'])
+      end
     end
 
     def config
-      return unless config_blob
+      return unless config_blob&.data
 
-      @config ||= ContainerRegistry::Config.new(self, config_blob) if config_blob.data
+      strong_memoize(:config) do
+        ContainerRegistry::Config.new(self, config_blob)
+      end
     end
 
     def created_at
       return unless config
 
-      @created_at ||= DateTime.rfc3339(config['created'])
+      strong_memoize(:created_at) do
+        DateTime.rfc3339(config['created'])
+      end
     end
 
     def layers
-      return @layers if defined?(@layers)
       return unless manifest
 
-      layers = manifest['layers'] || manifest['fsLayers']
+      strong_memoize(:layers) do
+        layers = manifest['layers'] || manifest['fsLayers']
 
-      @layers = layers.map do |layer|
-        repository.blob(layer)
+        layers.map do |layer|
+          repository.blob(layer)
+        end
       end
     end