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Integration between Micronaut and Apache Pulsar
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/*
 * Copyright 2017-2022 original authors
 *
 * 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
 *
 * https://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.micronaut.pulsar;

import io.micronaut.context.annotation.Factory;
import io.micronaut.context.annotation.Requires;
import io.micronaut.messaging.exceptions.MessagingClientException;
import io.micronaut.pulsar.config.PulsarClientConfiguration;
import io.netty.channel.EventLoopGroup;
import jakarta.inject.Singleton;
import org.apache.pulsar.client.api.PulsarClient;
import org.apache.pulsar.client.impl.ClientBuilderImpl;
import org.apache.pulsar.client.impl.PulsarClientImpl;
import org.apache.pulsar.client.impl.conf.ClientConfigurationData;

/**
 * Create bean of PulsarClient type which is required by consumers and producers.
 *
 * @author Haris Secic
 * @since 1.0
 */
@Factory
@Requires(beans = {PulsarClientConfiguration.class})
public final class PulsarClientFactory {

    /**
     * Simple factory method for building main PulsarClient that serves as a connection to Pulsar cluster.
     *
     * @param pulsarClientConfiguration Main configuration for building PulsarClient
     * @param eventLoopGroup netty's event loop group from Micronaut to pass to pulsar
     * @return Instance of {@link PulsarClient}
     * @throws MessagingClientException in case any of the required options are missing or malformed
     */
    @Singleton
    public PulsarClient pulsarClient(final PulsarClientConfiguration pulsarClientConfiguration,
                                     final EventLoopGroup eventLoopGroup) throws MessagingClientException {
        final ClientBuilderImpl clientBuilder = (ClientBuilderImpl) new ClientBuilderImpl()
            .authentication(pulsarClientConfiguration.getAuthentication());

        if (pulsarClientConfiguration.getServiceUrlProvider().isPresent()) {
            clientBuilder.serviceUrlProvider(pulsarClientConfiguration.getServiceUrlProvider().get());
        } else { //Because service URL defaults to localhost it's required to first check for providers
            clientBuilder.serviceUrl(pulsarClientConfiguration.getServiceUrl());
        }

        pulsarClientConfiguration.getIoThreads().ifPresent(clientBuilder::ioThreads);
        pulsarClientConfiguration.getListenerThreads().ifPresent(clientBuilder::listenerThreads);
        pulsarClientConfiguration.getSslProvider().ifPresent(clientBuilder::sslProvider);
        pulsarClientConfiguration.getTlsTrustStorePath().ifPresent(clientBuilder::tlsTrustStorePath);
        pulsarClientConfiguration.getTlsTrustStorePassword().ifPresent(clientBuilder::tlsTrustStorePassword);
        pulsarClientConfiguration.getTlsCertFilePath().ifPresent(clientBuilder::tlsTrustCertsFilePath);
        pulsarClientConfiguration.getTlsAllowInsecureConnection().ifPresent(clientBuilder::allowTlsInsecureConnection);
        pulsarClientConfiguration.getTlsVerifyHostname().ifPresent(clientBuilder::enableTlsHostnameVerification);
        pulsarClientConfiguration.getTlsCiphers().ifPresent(clientBuilder::tlsCiphers);
        pulsarClientConfiguration.getTlsProtocols().ifPresent(clientBuilder::tlsProtocols);

        try {
            final ClientConfigurationData data = clientBuilder.getClientConfigurationData();
            return new PulsarClientImpl(data, eventLoopGroup);
        } catch (Exception ex) {
            throw new MessagingClientException("Failed to initialize Pulsar Client", ex);
        }
    }
}