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Kafka on Pulsar Proxy
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/**
 * Copyright (c) 2019 - 2024 StreamNative, Inc.. All Rights Reserved.
 */
/**
 * Licensed 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 io.streamnative.pulsar.handlers.kop.proxy;

import com.github.benmanes.caffeine.cache.Cache;
import com.google.common.annotations.VisibleForTesting;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.ssl.SslHandler;
import io.streamnative.pulsar.handlers.kop.EndPoint;
import io.streamnative.pulsar.handlers.kop.KafkaProtocolHandler;
import io.streamnative.pulsar.handlers.kop.utils.ssl.SSLUtils;
import java.io.IOException;
import java.net.InetSocketAddress;
import javax.annotation.Nullable;
import lombok.RequiredArgsConstructor;
import org.apache.kafka.common.TopicPartition;
import org.eclipse.jetty.util.ssl.SslContextFactory;

@RequiredArgsConstructor
public class KafkaProxyChannelInitializer extends ChannelInitializer {

    private final EndPoint advertisedEndPoint;
    private final ConnectionFactory connectionFactory;
    @Nullable
    private final SslContextFactory.Server sslContextFactory;
    private final Cache leaderCache;

    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        boolean isClientAuth = false;
        if (sslContextFactory != null) {
            isClientAuth = sslContextFactory.getWantClientAuth() || sslContextFactory.getNeedClientAuth();
            ch.pipeline().addLast(KafkaProtocolHandler.TLS_HANDLER,
                new SslHandler(SSLUtils.createSslEngine(sslContextFactory)));
        }
        ch.pipeline().addLast(new LengthFieldPrepender(4));
        ch.pipeline().addLast("frameDecoder",
            new LengthFieldBasedFrameDecoder(100 * 1024 * 1024/* 100 MB */, 0, 4, 0, 4));
        ch.pipeline().addLast("handler", newCnx(isClientAuth));
    }

    @VisibleForTesting
    KafkaProxyRequestHandler newCnx(boolean isClientAuth) throws IOException {
        return new KafkaProxyRequestHandler(advertisedEndPoint, connectionFactory, isClientAuth, leaderCache);
    }
}