[GitHub] [hbase] virajjasani commented on a change in pull request #413: HBASE-22743 : ClientUtils for Demo Client classes

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virajjasani commented on a change in pull request #413: HBASE-22743 : ClientUtils for Demo Client classes
URL: https://github.com/apache/hbase/pull/413#discussion_r307957685
 
 

 ##########
 File path: hbase-examples/src/main/java/org/apache/hadoop/hbase/util/ClientUtils.java
 ##########
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+/**
+ *
+ * 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.hadoop.hbase.util;
+
+import java.nio.ByteBuffer;
+import java.nio.charset.CharacterCodingException;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetDecoder;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.SortedMap;
+import java.util.TreeMap;
+import javax.security.auth.Subject;
+import javax.security.auth.login.AppConfigurationEntry;
+import javax.security.auth.login.Configuration;
+import javax.security.auth.login.LoginContext;
+import javax.security.auth.login.LoginException;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.hadoop.hbase.thrift.generated.TCell;
+import org.apache.hadoop.hbase.thrift.generated.TRowResult;
+import org.apache.yetus.audience.InterfaceAudience;
+
+/**
+ * Common Utility class for clients
+ */
+@InterfaceAudience.Private
+public class ClientUtils {
+
+  private ClientUtils() {
+    // Empty block
+  }
+
+  private static final CharsetDecoder DECODER = Charset.forName("UTF-8").newDecoder();
+
+  /**
+   * To authenticate the demo client, kinit should be invoked ahead. Here we try to get the
+   * Kerberos credential from the ticket cache
+   *
+   * @return LoginContext Object
+   * @throws LoginException Exception thrown if unable to get LoginContext
+   */
+  public static LoginContext getLoginContext() throws LoginException {
+
+    return new LoginContext(StringUtils.EMPTY, new Subject(), null, new Configuration() {
+      @Override
+      public AppConfigurationEntry[] getAppConfigurationEntry(String name) {
+        Map<String, String> options = new HashMap<>();
+        options.put("useKeyTab", "false");
+        options.put("storeKey", "false");
+        options.put("doNotPrompt", "true");
+        options.put("useTicketCache", "true");
+        options.put("renewTGT", "true");
+        options.put("refreshKrb5Config", "true");
+        options.put("isInitiator", "true");
+        String ticketCache = System.getenv("KRB5CCNAME");
+        if (ticketCache != null) {
+          options.put("ticketCache", ticketCache);
+        }
+        options.put("debug", "true");
+
+        return new AppConfigurationEntry[]{new AppConfigurationEntry(
+            "com.sun.security.auth.module.Krb5LoginModule",
+            AppConfigurationEntry.LoginModuleControlFlag.REQUIRED, options)};
+      }
+    });
+
+  }
+
+  /**
+   * copy values into a TreeMap to get them in sorted order and print it
+   *
+   * @param rowResult Holds row name and then a map of columns to cells
+   */
+  public static void printRow(TRowResult rowResult) {
+
+    TreeMap<String, TCell> sorted = new TreeMap<>();
+    for (Map.Entry<ByteBuffer, TCell> column : rowResult.columns.entrySet()) {
+      sorted.put(utf8(column.getKey().array()), column.getValue());
+    }
+
+    StringBuilder rowStr = new StringBuilder();
+    for (SortedMap.Entry<String, TCell> entry : sorted.entrySet()) {
+      rowStr.append(entry.getKey());
+      rowStr.append(" => ");
+      rowStr.append(utf8(entry.getValue().value.array()));
+      rowStr.append("; ");
+    }
+    System.out.println("row: " + utf8(rowResult.row.array()) + ", cols: " + rowStr);
+
+  }
+
+  /**
+   * Helper to translate byte[]'s to UTF8 strings
+   *
+   * @param buf byte array buffer
+   * @return UTF8 decoded string value
+   */
+  public static String utf8(byte[] buf) {
+    try {
 
 Review comment:
   Done. Please review

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