Fixed bug where DataLakeDirectoryClient(Uri,..) would throw a null exception if GetPaths was called (Azure#17698)

Author: amnguye

sdk/storage/Azure.Storage.Files.DataLake/CHANGELOG.md

@@ -4,6 +4,7 @@
 - Fixed bug where the Stream returned by DataLakeFileClient.OpenRead() would return a different Length after calls to Seek().
 - Added constructors taking connection string to DataLakeServiceClient, DataLakeFileSystemClient, DataLakeDirectoryClient, and DataLakeFileClient.
 - Fixed bug where DataLakePathClient.SetPermissions(), DataLakeFileClient.SetPermissions(), and DataLakeDirectoryClient.SetPermissions() could not just set Owner or Group.
+- Fixed bug where DataLakeDirectoryClient initialized with a Uri would throw a null exception when GetPaths() was called.
 
 ## 12.6.0-beta.1 (2020-12-07)
 - Added support for service version 2020-04-08.

sdk/storage/Azure.Storage.Files.DataLake/src/DataLakePathClient.cs

@@ -435,6 +435,14 @@ internal DataLakePathClient(
             _clientDiagnostics = new ClientDiagnostics(options);
             _storageSharedKeyCredential = storageSharedKeyCredential;
             _blockBlobClient = BlockBlobClientInternals.Create(_blobUri, _pipeline, Version.AsBlobsVersion(), _clientDiagnostics);
+
+            uriBuilder.DirectoryOrFilePath = null;
+            _fileSystemClient = new DataLakeFileSystemClient(
+                uriBuilder.ToDfsUri(),
+                _pipeline,
+                storageSharedKeyCredential,
+                Version,
+                ClientDiagnostics);
         }
 
         /// <summary>

sdk/storage/Azure.Storage.Files.DataLake/tests/DirectoryClientTests.cs

@@ -4836,6 +4836,31 @@ public async Task GetPathsAsync()
             Assert.AreEqual($"{directoryName}/foo", paths[2].Name);
         }
 
+        [Test]
+        public async Task GetPathsAsync_UriCtor()
+        {
+            // Arrange
+            await using DisposingFileSystem test = await GetNewFileSystem();
+            string directoryName = GetNewDirectoryName();
+            DataLakeUriBuilder uriBuilder = new DataLakeUriBuilder(test.FileSystem.Uri)
+            {
+                DirectoryOrFilePath = directoryName
+            };
+            DataLakeDirectoryClient directory = InstrumentClient(
+                new DataLakeDirectoryClient(uriBuilder.ToUri(), GetStorageSharedKeyCredentials(), GetOptions()));
+            await SetUpDirectoryForListing(directory);
+
+            // Act
+            AsyncPageable<PathItem> response = directory.GetPathsAsync();
+            IList<PathItem> paths = await response.ToListAsync();
+
+            // Assert
+            Assert.AreEqual(3, paths.Count);
+            Assert.AreEqual($"{directoryName}/bar", paths[0].Name);
+            Assert.AreEqual($"{directoryName}/baz", paths[1].Name);
+            Assert.AreEqual($"{directoryName}/foo", paths[2].Name);
+        }
+
         [Test]
         public async Task GetPathsAsync_Recursive()
         {