Add ratis-shell cmd to generate a new raft-meta.conf.

ratis-shell/src/main/java/org/apache/ratis/shell/cli/sh/command/GenerationCommand.java

@@ -0,0 +1,58 @@
+/*
+ * 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.ratis.shell.cli.sh.command;
+
+import org.apache.ratis.shell.cli.sh.generation.RaftMetaConfCommand;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.function.Function;
+
+/**
+ * Command for generate ratis meta file
+ */
+public class GenerationCommand extends AbstractParentCommand {
+
+  private static final List<Function<Context, AbstractRatisCommand>> SUB_COMMAND_CONSTRUCTORS
+      = Collections.unmodifiableList(Arrays.asList(RaftMetaConfCommand::new));
+
+  /**
+   * @param context command context
+   */
+  public GenerationCommand(Context context) {
+    super(context, SUB_COMMAND_CONSTRUCTORS);
+  }
+
+  @Override
+  public String getCommandName() {
+    return "generation";
+  }
+
+  @Override
+  public String getDescription() {
+    return description();
+  }
+
+  /**
+   * @return command's description
+   */
+  public static String description() {
+    return "Generate ratis meta data file; see the sub-commands for the details.";
+  }
+}

ratis-shell/src/main/java/org/apache/ratis/shell/cli/sh/generation/RaftMetaConfCommand.java

@@ -0,0 +1,136 @@
+/*
+ * 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.ratis.shell.cli.sh.generation;
+
+import org.apache.commons.cli.CommandLine;
+import org.apache.commons.cli.Option;
+import org.apache.commons.cli.Options;
+import org.apache.ratis.proto.RaftProtos;
+import org.apache.ratis.shell.cli.sh.command.AbstractRatisCommand;
+import org.apache.ratis.shell.cli.sh.command.Context;
+import org.apache.ratis.thirdparty.com.google.protobuf.ByteString;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+
+public class RaftMetaConfCommand extends AbstractRatisCommand {
+  public static final String PATH_OPTION_NAME = "path";
+  public static final String LOG_ENTRY_INDEX_OPTION_NAME = "index";
+
+  private static final String RAFT_META_CONF = "raft-meta.conf";
+  private static final String NEW_RAFT_META_CONF = "new-raft-meta.conf";
+
+  /**
+   * @param context command context
+   */
+  public RaftMetaConfCommand(Context context) {
+    super(context);
+  }
+
+  @Override
+  public String getCommandName() {
+    return "raftMetaConf";
+  }
+
+  @Override
+  public int run(CommandLine cl) throws IOException {
+    String peersStr = cl.getOptionValue(PEER_OPTION_NAME);
+    String path = cl.getOptionValue(PATH_OPTION_NAME);
+    List<RaftProtos.RaftPeerProto> raftPeerProtos = new ArrayList<>();
+    for (String peer : peersStr.split(",")) {
+      String[] peerInfos = peer.split(":");
+      String peerId = peerInfos[0] + "_" + peerInfos[1];
+      raftPeerProtos.add(RaftProtos.RaftPeerProto.newBuilder()
+          .setId(ByteString.copyFrom(peerId.getBytes(StandardCharsets.UTF_8))).setAddress(peer)
+          .setStartupRole(RaftProtos.RaftPeerRole.FOLLOWER).build());
+    }
+    long index;
+    if (cl.hasOption(LOG_ENTRY_INDEX_OPTION_NAME)) {
+      index = Long.parseLong(cl.getOptionValue(LOG_ENTRY_INDEX_OPTION_NAME));
+    } else {
+      try (InputStream in = new FileInputStream(new File(path, RAFT_META_CONF))) {
+        index = RaftProtos.LogEntryProto.newBuilder().mergeFrom(in).build().getIndex() + 1;
+        System.out.println("Index in the original file is: " + (index - 1));
+      }
+    }
+    try (OutputStream out = new FileOutputStream(new File(path, NEW_RAFT_META_CONF))) {
+      RaftProtos.LogEntryProto generateLogEntryProto = RaftProtos.LogEntryProto.newBuilder()
+          .setConfigurationEntry(RaftProtos.RaftConfigurationProto.newBuilder()
+              .addAllPeers(raftPeerProtos).build())
+          .setIndex(index).build();
+      System.out.println("Generate new LogEntryProto info is:\n"+ generateLogEntryProto);
+      generateLogEntryProto.writeTo(out);
+    }
+    return 0;
+  }
+
+  @Override
+  public String getUsage() {
+    return String.format("%s"
+            + " -%s <PEER0_HOST:PEER0_PORT,PEER1_HOST:PEER1_PORT,PEER2_HOST:PEER2_PORT>"
+            + " -%s <PATH>"
+            + " [-%s <LOG_ENTRY_INDEX>]",
+        getCommandName(), PEER_OPTION_NAME, PATH_OPTION_NAME, LOG_ENTRY_INDEX_OPTION_NAME);
+  }
+
+  @Override
+  public String getDescription() {
+    return description();
+  }
+
+  @Override
+  public Options getOptions() {
+    return new Options()
+        .addOption(
+            Option.builder()
+                .option(PEER_OPTION_NAME)
+                .hasArg()
+                .required()
+                .desc("Peer addresses seperated by comma")
+            .build())
+        .addOption(
+            Option.builder()
+                .option(PATH_OPTION_NAME)
+                .hasArg()
+                .required()
+                .desc("The parent path of raft-meta.conf")
+            .build())
+        .addOption(
+            Option.builder()
+                .option(LOG_ENTRY_INDEX_OPTION_NAME)
+                .hasArg()
+                .desc("The log entry index in raft-meta.conf(If index is specified directly, "
+                    + "the original file will be ignored)")
+            .build());
+  }
+
+  /**
+   * @return command's description
+   */
+  public static String description() {
+    return "Generate a new raft-meta.conf file.";
+  }
+}
+