YARN-11638. [GPG] GPG Support CLI. (#6396) Contributed by Shilun Fan.

Reviewed-by: Inigo Goiri <inigoiri@apache.org>
Signed-off-by: Shilun Fan <slfan1989@apache.org>

hadoop-yarn-project/hadoop-yarn/bin/yarn

@@ -52,6 +52,7 @@ function hadoop_usage
   hadoop_add_subcommand "rmadmin" admin "admin tools"
   hadoop_add_subcommand "router" daemon "run the Router daemon"
   hadoop_add_subcommand "routeradmin" admin "router admin tools"
+  hadoop_add_subcommand "gpgadmin" admin "yan gpg admin tools"
   hadoop_add_subcommand "schedulerconf" client "Updates scheduler configuration"
   hadoop_add_subcommand "scmadmin" admin "SharedCacheManager admin tools"
   hadoop_add_subcommand "sharedcachemanager" daemon "run the SharedCacheManager daemon"
@@ -193,6 +194,9 @@ ${HADOOP_COMMON_HOME}/${HADOOP_COMMON_LIB_JARS_DIR}"
     routeradmin)
       HADOOP_CLASSNAME='org.apache.hadoop.yarn.client.cli.RouterCLI'
     ;;
+    gpgadmin)
+      HADOOP_CLASSNAME='org.apache.hadoop.yarn.client.cli.GpgCLI'
+    ;;
     schedulerconf)
     HADOOP_CLASSNAME='org.apache.hadoop.yarn.client.cli.SchedConfCLI'
     ;;

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/cli/GpgCLI.java

@@ -0,0 +1,81 @@
+/**
+ * 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.yarn.client.cli;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.conf.Configured;
+import org.apache.hadoop.util.Tool;
+import org.apache.hadoop.util.ToolRunner;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+
+public class GpgCLI extends Configured implements Tool {
+
+  public GpgCLI() {
+    super();
+  }
+
+  public GpgCLI(Configuration conf) {
+    super(conf);
+  }
+
+  private static void printHelp() {
+    StringBuilder summary = new StringBuilder();
+    summary.append("gpgadmin command line for YARN Federation Policy management.\n");
+    StringBuilder helpBuilder = new StringBuilder();
+    System.out.println(summary);
+    helpBuilder.append(" -help [cmd]: Displays help for the given command or all commands" +
+        " if none is specified.");
+    System.out.println(helpBuilder);
+    System.out.println();
+    ToolRunner.printGenericCommandUsage(System.out);
+  }
+
+  private static void printUsage() {
+    StringBuilder usageBuilder = new StringBuilder();
+    buildUsageMsg(usageBuilder);
+    System.err.println(usageBuilder);
+    ToolRunner.printGenericCommandUsage(System.err);
+  }
+
+  private static void buildUsageMsg(StringBuilder builder) {
+    builder.append("gpgadmin is only used in Yarn Federation Mode.\n");
+    builder.append("Usage: gpgadmin\n");
+    builder.append("   -help" + " [cmd]\n");
+  }
+
+  @Override
+  public int run(String[] args) throws Exception {
+    YarnConfiguration yarnConf = getConf() == null ?
+        new YarnConfiguration() : new YarnConfiguration(getConf());
+    boolean isFederationEnabled = yarnConf.getBoolean(YarnConfiguration.FEDERATION_ENABLED,
+        YarnConfiguration.DEFAULT_FEDERATION_ENABLED);
+
+    if (args.length < 1 || !isFederationEnabled) {
+      printUsage();
+      return -1;
+    }
+
+    String cmd = args[0];
+    if ("-help".equals(cmd)) {
+      printHelp();
+      return 0;
+    }
+
+    return 0;
+  }
+}

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/test/java/org/apache/hadoop/yarn/client/cli/TestGpgCLI.java

@@ -0,0 +1,52 @@
+/**
+ * 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.yarn.client.cli;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.junit.Assert.assertEquals;
+
+public class TestGpgCLI {
+  private GpgCLI gpgCLI;
+
+  @Before
+  public void setup() throws Exception {
+    Configuration config = new Configuration();
+    config.setBoolean(YarnConfiguration.FEDERATION_ENABLED, true);
+    gpgCLI = new GpgCLI(config);
+  }
+
+  @Test
+  public void testHelp() throws Exception {
+    PrintStream oldOutPrintStream = System.out;
+    PrintStream oldErrPrintStream = System.err;
+    ByteArrayOutputStream dataOut = new ByteArrayOutputStream();
+    ByteArrayOutputStream dataErr = new ByteArrayOutputStream();
+    System.setOut(new PrintStream(dataOut));
+    System.setErr(new PrintStream(dataErr));
+
+    String[] args = {"-help"};
+    assertEquals(0, gpgCLI.run(args));
+  }
+}