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Kafka on Pulsar implemented using Pulsar Protocol Handler
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/**
 * 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;

import static io.streamnative.pulsar.handlers.kop.KafkaProtocolHandler.TLS_HANDLER;

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.netty.handler.timeout.IdleStateHandler;
import io.streamnative.pulsar.handlers.kop.storage.ReplicaManager;
import io.streamnative.pulsar.handlers.kop.utils.delayed.DelayedOperation;
import io.streamnative.pulsar.handlers.kop.utils.delayed.DelayedOperationPurgatory;
import io.streamnative.pulsar.handlers.kop.utils.ssl.SSLUtils;
import java.util.concurrent.TimeUnit;
import lombok.Getter;
import org.apache.bookkeeper.common.util.OrderedScheduler;
import org.apache.pulsar.broker.PulsarService;
import org.eclipse.jetty.util.ssl.SslContextFactory;

/**
 * A channel initializer that initialize channels for kafka protocol.
 */
public class KafkaChannelInitializer extends ChannelInitializer {

    public static final int MAX_FRAME_LENGTH = 100 * 1024 * 1024; // 100MB

    @Getter
    private final PulsarService pulsarService;
    @Getter
    private final KafkaServiceConfiguration kafkaConfig;
    @Getter
    private final TenantContextManager tenantContextManager;
    private final ReplicaManager replicaManager;
    @Getter
    private final KopBrokerLookupManager kopBrokerLookupManager;
    @Getter
    private final KafkaTopicManagerSharedState kafkaTopicManagerSharedState;
    private final KafkaTopicLookupService kafkaTopicLookupService;
    private final LookupClient lookupClient;

    private final AdminManager adminManager;
    private DelayedOperationPurgatory fetchPurgatory;
    @Getter
    private final boolean enableTls;
    @Getter
    private final EndPoint advertisedEndPoint;
    private final boolean skipMessagesWithoutIndex;
    @Getter
    private final SslContextFactory.Server sslContextFactory;
    @Getter
    private final RequestStats requestStats;
    private final OrderedScheduler sendResponseScheduler;

    private final LengthFieldPrepender lengthFieldPrepender;

    public KafkaChannelInitializer(PulsarService pulsarService,
                                   KafkaServiceConfiguration kafkaConfig,
                                   TenantContextManager tenantContextManager,
                                   ReplicaManager replicaManager,
                                   KopBrokerLookupManager kopBrokerLookupManager,
                                   AdminManager adminManager,
                                   DelayedOperationPurgatory fetchPurgatory,
                                   boolean enableTLS,
                                   EndPoint advertisedEndPoint,
                                   boolean skipMessagesWithoutIndex,
                                   RequestStats requestStats,
                                   OrderedScheduler sendResponseScheduler,
                                   KafkaTopicManagerSharedState kafkaTopicManagerSharedState,
                                   KafkaTopicLookupService kafkaTopicLookupService,
                                   LookupClient lookupClient) {
        super();
        this.pulsarService = pulsarService;
        this.kafkaConfig = kafkaConfig;
        this.tenantContextManager = tenantContextManager;
        this.replicaManager = replicaManager;
        this.kopBrokerLookupManager = kopBrokerLookupManager;
        this.lookupClient = lookupClient;
        this.adminManager = adminManager;
        this.fetchPurgatory = fetchPurgatory;
        this.enableTls = enableTLS;
        this.advertisedEndPoint = advertisedEndPoint;
        this.skipMessagesWithoutIndex = skipMessagesWithoutIndex;
        this.requestStats = requestStats;
        if (enableTls) {
            sslContextFactory = SSLUtils.createSslContextFactory(kafkaConfig);
        } else {
            sslContextFactory = null;
        }
        this.sendResponseScheduler = sendResponseScheduler;
        this.kafkaTopicManagerSharedState = kafkaTopicManagerSharedState;
        this.lengthFieldPrepender = new LengthFieldPrepender(4);
        this.kafkaTopicLookupService = kafkaTopicLookupService;
    }

    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ch.pipeline().addLast("idleStateHandler",
                new IdleStateHandler(
                        kafkaConfig.getConnectionMaxIdleMs(),
                        kafkaConfig.getConnectionMaxIdleMs(),
                        0,
                        TimeUnit.MILLISECONDS));
        if (this.enableTls) {
            ch.pipeline().addLast(TLS_HANDLER, new SslHandler(SSLUtils.createSslEngine(sslContextFactory)));
        }
        ch.pipeline().addLast(lengthFieldPrepender);
        ch.pipeline().addLast("frameDecoder",
            new LengthFieldBasedFrameDecoder(MAX_FRAME_LENGTH, 0, 4, 0, 4));
        ch.pipeline().addLast("handler", newCnx());
    }

    @VisibleForTesting
    public KafkaRequestHandler newCnx() throws Exception {
        return new KafkaRequestHandler(pulsarService, kafkaConfig,
                tenantContextManager, replicaManager, kopBrokerLookupManager, adminManager, fetchPurgatory,
                enableTls, advertisedEndPoint, skipMessagesWithoutIndex, requestStats, sendResponseScheduler,
                kafkaTopicManagerSharedState, kafkaTopicLookupService, lookupClient);
    }

    @VisibleForTesting
    public KafkaRequestHandler newCnx(final TenantContextManager tenantContextManager) throws Exception {
        return new KafkaRequestHandler(pulsarService, kafkaConfig,
                tenantContextManager, replicaManager, kopBrokerLookupManager, adminManager, fetchPurgatory,
                enableTls, advertisedEndPoint, skipMessagesWithoutIndex,
                requestStats,
                sendResponseScheduler,
                kafkaTopicManagerSharedState, kafkaTopicLookupService, lookupClient);
    }
}