refactor!: modernize registry interface

src/OrasProject.Oras/Content/IPredecessorFinder.cs → src/OrasProject.Oras/Content/IPredecessorFindable.cs

@@ -19,12 +19,12 @@
 namespace OrasProject.Oras.Content;
 
 /// <summary>
-/// IPredecessorFinder finds out the nodes directly pointing to a given node of a
+/// Finds out the nodes directly pointing to a given node of a
 /// directed acyclic graph.
 /// In other words, returns the "parents" of the current descriptor.
 /// IPredecessorFinder is an extension of Storage.
 /// </summary>
-public interface IPredecessorFinder
+public interface IPredecessorFindable
 {
     /// <summary>
     /// returns the nodes directly pointing to the current node.

src/OrasProject.Oras/Content/MemoryGraph.cs

@@ -20,7 +20,7 @@
 
 namespace OrasProject.Oras.Content;
 
-internal class MemoryGraph : IPredecessorFinder
+internal class MemoryGraph : IPredecessorFindable
 {
     private readonly ConcurrentDictionary<BasicDescriptor, ConcurrentDictionary<BasicDescriptor, Descriptor>> _predecessors = new();
 

src/OrasProject.Oras/Content/MemoryStore.cs

@@ -20,7 +20,7 @@
 
 namespace OrasProject.Oras.Content;
 
-public class MemoryStore : ITarget, IPredecessorFinder
+public class MemoryStore : ITarget, IPredecessorFindable
 {
     private readonly MemoryStorage _storage = new();
     private readonly MemoryTagStore _tagResolver = new();

src/OrasProject.Oras/Interfaces/Registry/IManifestStore.cs → src/OrasProject.Oras/Registry/IBlobStore.cs

@@ -13,13 +13,11 @@
 
 using OrasProject.Oras.Content;
 
-namespace OrasProject.Oras.Interfaces.Registry
+namespace OrasProject.Oras.Registry;
+
+/// <summary>
+/// IBlobStore is a CAS with the ability to stat and delete its content.
+/// </summary>
+public interface IBlobStore : IStorage, IResolvable, IDeletable, IReferenceFetchable
 {
-    /// <summary>
-    /// IManifestStore is a CAS with the ability to stat and delete its content.
-    /// Besides, IManifestStore provides reference tagging.
-    /// </summary>
-    public interface IManifestStore : IBlobStore, IReferencePusher, ITaggable
-    {
-    }
 }

src/OrasProject.Oras/Interfaces/Registry/IBlobStore.cs → src/OrasProject.Oras/Registry/IManifestStore.cs

@@ -13,12 +13,12 @@
 
 using OrasProject.Oras.Content;
 
-namespace OrasProject.Oras.Interfaces.Registry
+namespace OrasProject.Oras.Registry;
+
+/// <summary>
+/// IManifestStore is a CAS with the ability to stat and delete its content.
+/// Besides, IManifestStore provides reference tagging.
+/// </summary>
+public interface IManifestStore : IBlobStore, IReferencePushable, ITaggable
 {
-    /// <summary>
-    /// IBlobStore is a CAS with the ability to stat and delete its content.
-    /// </summary>
-    public interface IBlobStore : IStorage, IResolvable, IDeletable, IReferenceFetcher
-    {
-    }
 }

src/OrasProject.Oras/Interfaces/Registry/IReferenceFetcher.cs → src/OrasProject.Oras/Registry/IReferenceFetchable.cs

@@ -16,19 +16,18 @@
 using System.Threading;
 using System.Threading.Tasks;
 
-namespace OrasProject.Oras.Interfaces.Registry
+namespace OrasProject.Oras.Registry;
+
+/// <summary>
+/// Provides advanced fetch with the tag service.
+/// </summary>
+public interface IReferenceFetchable
 {
     /// <summary>
-    /// IReferenceFetcher provides advanced fetch with the tag service.
+    /// Fetches the content identified by the reference.
     /// </summary>
-    public interface IReferenceFetcher
-    {
-        /// <summary>
-        /// FetchReferenceAsync fetches the content identified by the reference.
-        /// </summary>
-        /// <param name="reference"></param>
-        /// <param name="cancellationToken"></param>
-        /// <returns></returns>
-        Task<(Descriptor Descriptor, Stream Stream)> FetchReferenceAsync(string reference, CancellationToken cancellationToken = default);
-    }
+    /// <param name="reference"></param>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    Task<(Descriptor Descriptor, Stream Stream)> FetchAsync(string reference, CancellationToken cancellationToken = default);
 }

src/OrasProject.Oras/Interfaces/Registry/IReferencePusher.cs → src/OrasProject.Oras/Registry/IReferencePushable.cs

@@ -16,21 +16,20 @@
 using System.Threading;
 using System.Threading.Tasks;
 
-namespace OrasProject.Oras.Interfaces.Registry
+namespace OrasProject.Oras.Registry;
+
+/// <summary>
+/// Provides advanced push with the tag service.
+/// </summary>
+public interface IReferencePushable
 {
     /// <summary>
-    /// IReferencePusher provides advanced push with the tag service.
+    /// PushReferenceAsync pushes the manifest with a reference tag.
     /// </summary>
-    public interface IReferencePusher
-    {
-        /// <summary>
-        /// PushReferenceAsync pushes the manifest with a reference tag.
-        /// </summary>
-        /// <param name="descriptor"></param>
-        /// <param name="content"></param>
-        /// <param name="reference"></param>
-        /// <param name="cancellationToken"></param>
-        /// <returns></returns>
-        Task PushReferenceAsync(Descriptor descriptor, Stream content, string reference, CancellationToken cancellationToken = default);
-    }
+    /// <param name="descriptor"></param>
+    /// <param name="content"></param>
+    /// <param name="reference"></param>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    Task PushAsync(Descriptor descriptor, Stream content, string reference, CancellationToken cancellationToken = default);
 }

src/OrasProject.Oras/Registry/IRegistry.cs

@@ -0,0 +1,49 @@
+// Copyright The ORAS Authors.
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace OrasProject.Oras.Registry;
+
+public interface IRegistry
+{
+    /// <summary>
+    /// Returns a repository reference by the given name.
+    /// </summary>
+    /// <param name="name"></param>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    Task<IRepository> GetRepository(string name, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Repositories lists the name of repositories available in the registry.
+    /// Since the returned repositories may be paginated by the underlying
+    /// implementation, a function should be passed in to process the paginated
+    /// repository list.
+    /// `last` argument is the `last` parameter when invoking the catalog API.
+    /// If `last` is NOT empty, the entries in the response start after the
+    /// repo specified by `last`. Otherwise, the response starts from the top
+    /// of the Repositories list.
+    /// Note: When implemented by a remote registry, the catalog API is called.
+    /// However, not all registries supports pagination or conforms the
+    /// specification.
+    /// Reference: https://docs.docker.com/registry/spec/api/#catalog
+    /// See also `Repositories()` in this package.
+    /// </summary>
+    /// <param name="last"></param>
+    /// <param name="cancellationToken"></param>
+    /// <returns></returns>
+    IAsyncEnumerable<string> ListRepositoriesAsync(string? last = default, CancellationToken cancellationToken = default);
+}