kafka MetadataShell 源码

kafka MetadataShell 代码

文件路径：/shell/src/main/java/org/apache/kafka/shell/MetadataShell.java

/*
 * 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.kafka.shell;

import kafka.raft.KafkaRaftManager;
import kafka.tools.TerseFailure;
import net.sourceforge.argparse4j.ArgumentParsers;
import net.sourceforge.argparse4j.inf.ArgumentParser;
import net.sourceforge.argparse4j.inf.Namespace;
import org.apache.kafka.common.utils.Exit;
import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.metadata.util.SnapshotFileReader;
import org.apache.kafka.server.common.ApiMessageAndVersion;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.BufferedWriter;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.ExecutionException;


/**
 * The Kafka metadata shell.
 */
public final class MetadataShell {
    private static final Logger log = LoggerFactory.getLogger(MetadataShell.class);

    public static class Builder {
        private String snapshotPath;

        public Builder setSnapshotPath(String snapshotPath) {
            this.snapshotPath = snapshotPath;
            return this;
        }

        public MetadataShell build() throws Exception {
            if (snapshotPath == null) {
                throw new RuntimeException("You must supply the log path via --snapshot");
            }
            MetadataNodeManager nodeManager = null;
            SnapshotFileReader reader = null;
            try {
                nodeManager = new MetadataNodeManager();
                reader = new SnapshotFileReader(snapshotPath, nodeManager.logListener());
                return new MetadataShell(null, reader, nodeManager);
            } catch (Throwable e) {
                log.error("Initialization error", e);
                if (reader != null) {
                    reader.close();
                }
                if (nodeManager != null) {
                    nodeManager.close();
                }
                throw e;
            }
        }
    }

    private final KafkaRaftManager<ApiMessageAndVersion> raftManager;

    private final SnapshotFileReader snapshotFileReader;

    private final MetadataNodeManager nodeManager;

    public MetadataShell(KafkaRaftManager<ApiMessageAndVersion> raftManager,
                        SnapshotFileReader snapshotFileReader,
                        MetadataNodeManager nodeManager) {
        this.raftManager = raftManager;
        this.snapshotFileReader = snapshotFileReader;
        this.nodeManager = nodeManager;
    }

    public void run(List<String> args) throws Exception {
        nodeManager.setup();
        if (raftManager != null) {
            raftManager.startup();
            raftManager.register(nodeManager.logListener());
        } else if (snapshotFileReader != null) {
            snapshotFileReader.startup();
        } else {
            throw new RuntimeException("Expected either a raft manager or snapshot reader");
        }
        if (args == null || args.isEmpty()) {
            // Interactive mode.
            System.out.println("Loading...");
            waitUntilCaughtUp();
            System.out.println("Starting...");
            try (InteractiveShell shell = new InteractiveShell(nodeManager)) {
                shell.runMainLoop();
            }
        } else {
            // Non-interactive mode.
            waitUntilCaughtUp();
            Commands commands = new Commands(false);
            try (PrintWriter writer = new PrintWriter(new BufferedWriter(
                    new OutputStreamWriter(System.out, StandardCharsets.UTF_8)))) {
                Commands.Handler handler = commands.parseCommand(args);
                handler.run(Optional.empty(), writer, nodeManager);
                writer.flush();
            }
        }
    }

    public void close() throws Exception {
        if (raftManager != null) {
            raftManager.shutdown();
        }
        if (snapshotFileReader != null) {
            snapshotFileReader.close();
        }
        nodeManager.close();
    }

    public static void main(String[] args) throws Exception {
        ArgumentParser parser = ArgumentParsers
            .newArgumentParser("metadata-tool")
            .defaultHelp(true)
            .description("The Apache Kafka metadata tool");
        parser.addArgument("--snapshot", "-s")
            .type(String.class)
            .help("The snapshot file to read.");
        parser.addArgument("command")
            .nargs("*")
            .help("The command to run.");
        Namespace res = parser.parseArgsOrFail(args);
        try {
            Builder builder = new Builder();
            builder.setSnapshotPath(res.getString("snapshot"));
            Path tempDir = Files.createTempDirectory("MetadataShell");
            Exit.addShutdownHook("agent-shutdown-hook", () -> {
                log.debug("Removing temporary directory " + tempDir.toAbsolutePath().toString());
                try {
                    Utils.delete(tempDir.toFile());
                } catch (Exception e) {
                    log.error("Got exception while removing temporary directory " +
                        tempDir.toAbsolutePath().toString());
                }
            });
            MetadataShell shell = builder.build();
            try {
                shell.run(res.getList("command"));
            } finally {
                shell.close();
            }
            Exit.exit(0);
        } catch (TerseFailure e) {
            System.err.println("Error: " + e.getMessage());
            Exit.exit(1);
        } catch (Throwable e) {
            System.err.println("Unexpected error: " +
                (e.getMessage() == null ? "" : e.getMessage()));
            e.printStackTrace(System.err);
            Exit.exit(1);
        }
    }

    void waitUntilCaughtUp() throws ExecutionException, InterruptedException {
        snapshotFileReader.caughtUpFuture().get();
    }
}

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