[GitHub] [incubator-gobblin] sv2000 commented on a change in pull request #3074: GOBBLIN-1228: Do not localize token file on new TaskRunner launch

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sv2000 commented on a change in pull request #3074:
URL: https://github.com/apache/incubator-gobblin/pull/3074#discussion_r468084022



##########
File path: gobblin-yarn/src/test/java/org/apache/gobblin/yarn/GobblinYarnTestUtils.java
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@@ -0,0 +1,78 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.gobblin.yarn;
+
+import java.io.IOException;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hadoop.fs.FileSystemTestHelper;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.security.Credentials;
+import org.apache.hadoop.security.token.Token;
+import org.apache.hadoop.security.token.TokenIdentifier;
+import org.mockito.Mockito;
+import org.mockito.invocation.InvocationOnMock;
+import org.mockito.stubbing.Answer;
+
+/**
+ * Utility class
+ */
+public class GobblinYarnTestUtils {
+  /**
+   * A utility method for generating a {@link org.apache.hadoop.fs.FileSystemTestHelper.MockFileSystem} instance
+   * that can return a delegation token on {@link org.apache.hadoop.fs.FileSystem#getDelegationToken(String)}.
+   *
+   * @param service
+   * @return
+   * @throws IOException
+   */
+  public static FileSystemTestHelper.MockFileSystem createFileSystemForServiceName(final String service)
+      throws IOException {
+    FileSystemTestHelper.MockFileSystem mockFs = new FileSystemTestHelper.MockFileSystem();
+    Mockito.when(mockFs.getCanonicalServiceName()).thenReturn(service);
+    Mockito.when(mockFs.getDelegationToken(Mockito.any(String.class))).thenAnswer(new Answer<Token<?>>() {
+      int unique = 0;
+      @Override
+      public Token<?> answer(InvocationOnMock invocation) throws Throwable {
+        Token<?> token = new Token<TokenIdentifier>();
+        token.setService(new Text(service));
+        // use unique value so when we restore from token storage, we can
+        // tell if it's really the same token
+        token.setKind(new Text("token" + unique++));
+        return token;
+      }
+    });
+    return mockFs;
+  }
+
+  /**
+   * Writes a token file to a given path.
+   * @param path
+   * @param serviceName
+   * @throws IOException
+   */
+  public static void createTokenFileForService(Path path, String serviceName)

Review comment:
       This is a utility method I used for creating the .token file added to the test resources folder. It can be potentially leveraged in the future. 




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