PiBox.Plugins.Messaging.Kafka.Flow 1.0.38

Kafka Flow Plugin

This plugin provides the nuget packages from KafkaFlow as Pibox plugin.

The containers that you need are also provided in the docker-compose.yaml file. You just need to configure the consumer(

19. and the producer(s) and use them accordingly.

Installation

Install the Plugin via Nuget

dotnet add package PiBox.Plugins.Messaging.Kafka.Flow

or add as package reference to your .csproj

<PackageReference Include="PiBox.Plugins.Messaging.Kafka.Flow" Version=""/>

Appsettings.yml

Configure your appsettings.yml accordingly.

kafka:
  client:
    bootstrapServers: "localhost:9092,localhost:9093"
  #    securityProtocol: "SaslPlaintext"
  #    saslPassword: "asdf"
  #    saslUsername: "asdf"
  #    saslMechanism: "Plain"
  #    sslCaLocation: ""
  #    enableSslCertificateVerification: "false"
  schemaRegistry:
    url: "localhost:8081"
#    basicAuthUserInfo: "developer:SECRET"
#    enableSslCertificateVerification: "false"

Containers

The docker-compose.yaml will run the following containers:

• zookeeper
• broker
• schema-registry
• control-center

To run all containers

docker-compose up

To stop and remove the currently running containers

docker-compose down

Usage

Plugin configuration

public class KafkaFlowExamplePlugin : IPluginServiceConfiguration
    {
        private readonly IConfiguration _configuration;
        private readonly ILogger? _logger;

        public KafkaFlowExamplePlugin(IConfiguration configuration, ILogger<KafkaFlowExamplePlugin>? logger)
        {
            _configuration = configuration;
            _logger = logger;
        }

        //Configure your consumers & producers
        public void ConfigureServices(IServiceCollection serviceCollection)
        {
            serviceCollection.ConfigureKafka(_configuration, _logger, kafkaFlowBuilder => kafkaFlowBuilder
                //possible configurations:

                // producerConfig is none
                // producer is added to a Dictionary<Type, Action<IProducerConfigurationBuilder>>
                // type is typeof(TMessage)
                .AddTypedProducer<TMessage>("protobuf-topic")

                // producer is added to a Dictionary<Type, Action<IProducerConfigurationBuilder>>
                // type is typeof(TMessage)
                .AddTypedProducer<TMessage>("protobuf-topic", producerConfig)

                // producerConfig is none
                // producer is added to a List<(string, Action<IProducerConfigurationBuilder>)
                // the string added is typeof(TProducer).Name
                .AddProducer<TProducer>("protobuf-topic")

                // producer is added to a List<(string, Action<IProducerConfigurationBuilder>)
                // the string added is typeof(TProducer).Name
                .AddProducer<TProducer>("protobuf-topic", producerConfig)

                // consumer is added to a List<Action<IConsumerConfigurationBuilder>>
                .AddConsumer<TMessageHandler>("protobuf-topic", "mygroup"));

                // consumer is added to a List<Action<IConsumerConfigurationBuilder>>
                // dead letter message is produced on dead letter topic in case of unsuccessful processing of the message
                .AddConsumerWithDeadLetter<TMessageHandler, TMessage, TDeadLetterMessage>("protobuf-topic", "dead-letter-topic", "mygroup")
        }
    }

Click here to read more about the IServiceCollection interface.

Protobuf message format example

syntax = "proto3";
message TMessage {
  string Message = 1;
  int32 Code = 2;
}

Click here to read more about protobuf

Consumer usage

public class ProtobufMessageHandler : IMessageHandler<ProtobufLogMessage>
{
    public Task Handle(IMessageContext context, ProtobufLogMessage message)
    {
        // Do something
    }
}

Consumer with dead letter message producer usage

// The DltMessageHandler inherits from IMessageHandler<TMessage> (used to create a message handler)
// It also produces a dead letter message if there was an exception in ProcessMessageAsync
public class ProtobufDltMessageHandler : DltMessageHandler<TMessage, TDeadLetterMessage>
    {
        protected override async Task ProcessMessageAsync(IMessageContext context, TMessage message)
        {
            // Do something
        }

        protected override TDeadLetterMessage HandleError(IMessageContext context, TMessage message, Error error)
        {
            // Do something
        }
    }

Producer usage (optional)

public class SampleProducer
    {
        private readonly IMessageProducer _producer;

        public SampleProducer(IProducerAccessor producerAccessor)
        {
            _producer = producerAccessor.GetProducer("TProducer");
        }

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            _producer.ProduceAsync("protobuf-topic", messageKey, messageValue);
        }
    }