feat(AddDirectory): improve performance

Cache the empty directory.

Author: richardschneider

src/Add.cs

@@ -12,6 +12,7 @@ namespace Ipfs.Api
 {
     public partial class IpfsClient
     {
+
         /// <summary>
         ///   Add a file to the interplanetary file system.
         /// </summary>
@@ -30,8 +31,8 @@ public Task<MerkleNode> AddFileAsync(string path)
         /// <param name="recursive"></param>
         public async Task<MerkleNode> AddDirectoryAsync(string path, bool recursive = true)
         {
+            // Add the files and sub-directories.
             path = Path.GetFullPath(path);
-            var folder = await Object.NewDirectoryAsync();
             var files = Directory
                 .EnumerateFiles(path)
                 .Select(AddFileAsync);
@@ -43,12 +44,12 @@ public async Task<MerkleNode> AddDirectoryAsync(string path, bool recursive = tr
                 files = files.Union(folders);
             }
             var nodes = await Task.WhenAll(files);
-            var links = nodes.Select(node => node.ToLink());
-
-            // TODO: Use DagNode.AddLinks
-            folder = new DagNode(folder.Data, links);
 
+            // Create the directory with links to the created files and sub-directories
+            var links = nodes.Select(node => node.ToLink());
+            var folder = emptyFolder.Value.AddLinks(links);
             var directory = await Object.PutAsync(folder);
+
             return new MerkleNode(directory.Hash, Path.GetFileName(path));
         }
 

src/IpfsApi.csproj

@@ -58,8 +58,8 @@
       <HintPath>..\packages\Google.Protobuf.3.1.0\lib\net45\Google.Protobuf.dll</HintPath>
       <Private>True</Private>
     </Reference>
-    <Reference Include="Ipfs.Core, Version=0.5.1.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\packages\Ipfs.Core.0.5.1\lib\net45\Ipfs.Core.dll</HintPath>
+    <Reference Include="Ipfs.Core, Version=0.6.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\Ipfs.Core.0.6.0\lib\net45\Ipfs.Core.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">

src/IpfsClient.cs

@@ -36,6 +36,8 @@ public partial class IpfsClient
         /// </summary>
         public static Uri DefaultApiUri = new Uri("http://localhost:5001");
 
+        Lazy<DagNode> emptyFolder;
+
         /// <summary>
         ///   Creates a new instance of the <see cref="IpfsClient"/> class and sets the
         ///   default values.
@@ -58,6 +60,8 @@ public IpfsClient()
             Swarm = new SwarmApi(this);
             Dag = new DagApi(this);
             Object = new ObjectApi(this);
+
+            emptyFolder = new Lazy<DagNode>(() => Object.NewDirectoryAsync().Result);
         }
 
         /// <summary>

src/packages.config

@@ -5,7 +5,7 @@
   <package id="Common.Logging" version="3.3.1" targetFramework="net45" />
   <package id="Common.Logging.Core" version="3.3.1" targetFramework="net45" />
   <package id="Google.Protobuf" version="3.1.0" targetFramework="net45" />
-  <package id="Ipfs.Core" version="0.5.1" targetFramework="net452" />
+  <package id="Ipfs.Core" version="0.6.0" targetFramework="net452" />
   <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net45" />
   <package id="SHA3" version="0.9.2" targetFramework="net452" />
 </packages>

test/IpfsApiTests.csproj

@@ -56,8 +56,8 @@
       <HintPath>..\packages\Google.Protobuf.3.1.0\lib\net45\Google.Protobuf.dll</HintPath>
       <Private>True</Private>
     </Reference>
-    <Reference Include="Ipfs.Core, Version=0.5.1.0, Culture=neutral, processorArchitecture=MSIL">
-      <HintPath>..\packages\Ipfs.Core.0.5.1\lib\net45\Ipfs.Core.dll</HintPath>
+    <Reference Include="Ipfs.Core, Version=0.6.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\Ipfs.Core.0.6.0\lib\net45\Ipfs.Core.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="Microsoft.CSharp" />

test/packages.config

@@ -5,7 +5,7 @@
   <package id="Common.Logging" version="3.3.1" targetFramework="net45" />
   <package id="Common.Logging.Core" version="3.3.1" targetFramework="net45" />
   <package id="Google.Protobuf" version="3.1.0" targetFramework="net45" />
-  <package id="Ipfs.Core" version="0.5.1" targetFramework="net452" />
+  <package id="Ipfs.Core" version="0.6.0" targetFramework="net452" />
   <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net45" />
   <package id="SHA3" version="0.9.2" targetFramework="net452" />
 </packages>