Make the controller and repository stack async (#28)

Author: joelverhagen

src/NuGet.Server.Core/Infrastructure/IServerPackageRepository.cs

@@ -2,25 +2,27 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Collections.Generic;
-using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace NuGet.Server.Core.Infrastructure
 {
     public interface IServerPackageRepository
     {
         string Source { get; }
 
-        void AddPackage(IPackage package);
+        Task AddPackageAsync(IPackage package, CancellationToken token);
 
-        IQueryable<IServerPackage> GetPackages();
+        Task<IEnumerable<IServerPackage>> GetPackagesAsync(CancellationToken token);
 
-        IQueryable<IServerPackage> Search(
+        Task<IEnumerable<IServerPackage>> SearchAsync(
             string searchTerm,
             IEnumerable<string> targetFrameworks,
-            bool allowPrereleaseVersions);
+            bool allowPrereleaseVersions,
+            CancellationToken token);
 
-        void ClearCache();
+        Task ClearCacheAsync(CancellationToken token);
 
-        void RemovePackage(string packageId, SemanticVersion version);
+        Task RemovePackageAsync(string packageId, SemanticVersion version, CancellationToken token);
     }
 }

src/NuGet.Server.Core/Infrastructure/IServerPackageStore.cs

@@ -2,6 +2,8 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace NuGet.Server.Core.Infrastructure
 {
@@ -16,7 +18,7 @@ public interface IServerPackageStore
 
         bool Exists(string id, SemanticVersion version);
 
-        HashSet<ServerPackage> GetAll(bool enableDelisting);
+        Task<HashSet<ServerPackage>> GetAllAsync(bool enableDelisting, CancellationToken token);
 
         void Remove(string id, SemanticVersion version, bool enableDelisting);
     }

src/NuGet.Server.Core/Infrastructure/ServerPackageExtensions.cs

@@ -14,7 +14,7 @@ public static bool IsReleaseVersion(this IServerPackage package)
             return string.IsNullOrEmpty(package.Version.SpecialVersion);
         }
 
-        public static IQueryable<T> FilterByPrerelease<T>(this IQueryable<T> packages, bool allowPrerelease)
+        public static IEnumerable<T> FilterByPrerelease<T>(this IEnumerable<T> packages, bool allowPrerelease)
             where T : IServerPackage
         {
             if (packages == null)
@@ -30,7 +30,7 @@ public static IQueryable<T> FilterByPrerelease<T>(this IQueryable<T> packages, b
             return packages;
         }
 
-        public static IQueryable<T> Find<T>(this IQueryable<T> packages, string searchText)
+        public static IEnumerable<T> Find<T>(this IEnumerable<T> packages, string searchText)
             where T : IServerPackage
         {
             var terms = searchText