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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