kafka PlaintextChannelBuilder 源码
kafka PlaintextChannelBuilder 代码
文件路径:/clients/src/main/java/org/apache/kafka/common/network/PlaintextChannelBuilder.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.common.network;
import org.apache.kafka.common.KafkaException;
import org.apache.kafka.common.memory.MemoryPool;
import org.apache.kafka.common.security.auth.KafkaPrincipal;
import org.apache.kafka.common.security.auth.KafkaPrincipalBuilder;
import org.apache.kafka.common.security.auth.KafkaPrincipalSerde;
import org.apache.kafka.common.security.auth.PlaintextAuthenticationContext;
import org.apache.kafka.common.utils.Utils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.Closeable;
import java.io.IOException;
import java.net.InetAddress;
import java.nio.channels.SelectionKey;
import java.util.Map;
import java.util.Optional;
import java.util.function.Supplier;
public class PlaintextChannelBuilder implements ChannelBuilder {
private static final Logger log = LoggerFactory.getLogger(PlaintextChannelBuilder.class);
private final ListenerName listenerName;
private Map<String, ?> configs;
/**
* Constructs a plaintext channel builder. ListenerName is non-null whenever
* it's instantiated in the broker and null otherwise.
*/
public PlaintextChannelBuilder(ListenerName listenerName) {
this.listenerName = listenerName;
}
public void configure(Map<String, ?> configs) throws KafkaException {
this.configs = configs;
}
@Override
public KafkaChannel buildChannel(String id, SelectionKey key, int maxReceiveSize,
MemoryPool memoryPool, ChannelMetadataRegistry metadataRegistry) throws KafkaException {
try {
PlaintextTransportLayer transportLayer = buildTransportLayer(key);
Supplier<Authenticator> authenticatorCreator = () -> new PlaintextAuthenticator(configs, transportLayer, listenerName);
return buildChannel(id, transportLayer, authenticatorCreator, maxReceiveSize,
memoryPool != null ? memoryPool : MemoryPool.NONE, metadataRegistry);
} catch (Exception e) {
throw new KafkaException(e);
}
}
// visible for testing
KafkaChannel buildChannel(String id, TransportLayer transportLayer, Supplier<Authenticator> authenticatorCreator,
int maxReceiveSize, MemoryPool memoryPool, ChannelMetadataRegistry metadataRegistry) {
return new KafkaChannel(id, transportLayer, authenticatorCreator, maxReceiveSize, memoryPool, metadataRegistry);
}
protected PlaintextTransportLayer buildTransportLayer(SelectionKey key) throws IOException {
return new PlaintextTransportLayer(key);
}
@Override
public void close() {}
private static class PlaintextAuthenticator implements Authenticator {
private final PlaintextTransportLayer transportLayer;
private final KafkaPrincipalBuilder principalBuilder;
private final ListenerName listenerName;
private PlaintextAuthenticator(Map<String, ?> configs, PlaintextTransportLayer transportLayer, ListenerName listenerName) {
this.transportLayer = transportLayer;
this.principalBuilder = ChannelBuilders.createPrincipalBuilder(configs, null, null);
this.listenerName = listenerName;
}
@Override
public void authenticate() {}
@Override
public KafkaPrincipal principal() {
InetAddress clientAddress = transportLayer.socketChannel().socket().getInetAddress();
// listenerName should only be null in Client mode where principal() should not be called
if (listenerName == null)
throw new IllegalStateException("Unexpected call to principal() when listenerName is null");
return principalBuilder.build(new PlaintextAuthenticationContext(clientAddress, listenerName.value()));
}
@Override
public Optional<KafkaPrincipalSerde> principalSerde() {
return principalBuilder instanceof KafkaPrincipalSerde ? Optional.of((KafkaPrincipalSerde) principalBuilder) : Optional.empty();
}
@Override
public boolean complete() {
return true;
}
@Override
public void close() {
if (principalBuilder instanceof Closeable)
Utils.closeQuietly((Closeable) principalBuilder, "principal builder");
}
}
}
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