{"id":21577944,"url":"https://github.com/wesleysbmartins/node_kafka","last_synced_at":"2026-05-10T16:37:12.658Z","repository":{"id":250463848,"uuid":"834161966","full_name":"wesleysbmartins/node_kafka","owner":"wesleysbmartins","description":"Implementação de integração entre uma aplicação Node TS com Kafka, criando seus tópicos, producers e consumers.","archived":false,"fork":false,"pushed_at":"2024-07-27T14:21:13.000Z","size":16,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":1,"default_branch":"master","last_synced_at":"2025-07-23T17:48:51.528Z","etag":null,"topics":["backend","factory","kafka","kafka-consumer","kafka-producer","kafkajs","node","node-js","nodejs","singleton","typescript","usecase"],"latest_commit_sha":null,"homepage":"","language":"TypeScript","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/wesleysbmartins.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2024-07-26T14:52:17.000Z","updated_at":"2024-08-09T20:09:59.000Z","dependencies_parsed_at":"2024-07-27T17:16:24.418Z","dependency_job_id":null,"html_url":"https://github.com/wesleysbmartins/node_kafka","commit_stats":null,"previous_names":["wesleysbmartins/node_kafka"],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/wesleysbmartins/node_kafka","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/wesleysbmartins%2Fnode_kafka","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/wesleysbmartins%2Fnode_kafka/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/wesleysbmartins%2Fnode_kafka/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/wesleysbmartins%2Fnode_kafka/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/wesleysbmartins","download_url":"https://codeload.github.com/wesleysbmartins/node_kafka/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/wesleysbmartins%2Fnode_kafka/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":32864081,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-05-10T13:40:02.631Z","status":"ssl_error","status_checked_at":"2026-05-10T13:40:02.145Z","response_time":54,"last_error":"SSL_connect returned=1 errno=0 peeraddr=140.82.121.5:443 state=error: unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["backend","factory","kafka","kafka-consumer","kafka-producer","kafkajs","node","node-js","nodejs","singleton","typescript","usecase"],"created_at":"2024-11-24T13:09:04.042Z","updated_at":"2026-05-10T16:37:12.630Z","avatar_url":"https://github.com/wesleysbmartins.png","language":"TypeScript","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Node [![My Skills](https://skillicons.dev/icons?i=nodejs)](https://skillicons.dev) Typescript [![My Skills](https://skillicons.dev/icons?i=ts)](https://skillicons.dev) Kafka Integration [![My Skills](https://skillicons.dev/icons?i=kafka)](https://skillicons.dev)\n\nEste é um exemplo de como uma aplicação Node pode trabalhar integrada ao Kafka.\n\n## Kafka\nApache Kafka é uma plataforma de streaming de eventos distribuída e altamente escalável, projetada para processar e gerenciar grandes volumes de dados em tempo real. Originalmente desenvolvido pela LinkedIn e posteriormente aberto como um projeto de código aberto pela Apache Software Foundation, o Kafka é amplamente utilizado em diversas indústrias para várias aplicações.\n\n\u003e **OBS:** Para entender melhor o que é o Kafka, como instalar e rodar em seu ambiente, acesse o meu [repositório](https://github.com/wesleysbmartins/kafka) onde registrei meus estudos sobre o tema.\n\n## Hands-On\nNeste momento iremos abordar de forma simples como integra o Kafka a sua aplicação Node usando a biblioteca [Kafkajs](https://www.npmjs.com/package/kafkajs) utilizando padrões de desenvolvimento como **Singleton**, **Factory** e **Usecases**.\n\n\u003cdetails\u003e\n    \u003csummary\u003eInicie sua aplicação\u003c/summary\u003e\n\nCrie uma pasta para a aplicação:\n```shell\nmkdir app-example-node-kafka\n```\nAcesse a pasta e inicie uma aplicação Node Typescript:\n```shell\nnpm init -y\n```\nCrie a configuração padrão do tsconfig:\n```shell\nnpx tsc --init\n```\nInstale as dependências de desenvolvimento:\n```shell\nnpm install typescript ts-node nodemon @types/node -D\n```\nInstale a dependência do Kafka:\n```shell\nnpm install kafkajs\n```\n\u003c/details\u003e\n\n### Client Kafka\nApós inicar sua aplicação podemos iniciar o desenvolvimento da aplicação, neste primeiro momento vamos criar o client do Kafka para sua aplicação e instancia-lo utilizando um Singleton.\n\nInterface:\n```ts\nexport interface IKafkaClient {\n    connect() : Promise\u003cvoid\u003e\n}\n```\nImplementação:\n```ts\nimport { Kafka, KafkaConfig } from \"kafkajs\";\nimport { IKafkaClient } from \"./IKafkaClient\";\n\nexport class KafkaClient implements IKafkaClient {\n    static instance: Kafka;\n\n    async connect(): Promise\u003cvoid\u003e {\n        const config : KafkaConfig = {\n            brokers: [\"localhost:9092\"],\n            clientId: \"node-client\",\n        };\n\n        try {\n            if (!KafkaClient.instance) {\n                KafkaClient.instance = new Kafka(config);\n            }\n\n            console.log(\"KAFKA CLIENT CREATED!\");\n            \n        } catch(err) {\n            const message = `KAFKA CLIENT ERROR\\nCONFIG:\\n${JSON.stringify(config)}ERROR:\\n${err}`;\n            console.log(message);\n            throw Error(message);\n        }\n    }\n}\n```\n\n### Factory Kafka\nPara a criação dos Producers e Consumers do Kafka vamos utilizar a abordagem de Factory.\n\n### Producer\n\nInterface:\n```ts\nexport interface IProducerFactory {\n    sendMessage(key: Buffer | string, value: Buffer | string, partition?: number) : Promise\u003cvoid\u003e\n}\n```\nImplementação:\n```ts\nimport { Partitioners, Producer, ProducerRecord } from \"kafkajs\";\nimport { IProducerFactory } from \"./IProducer\";\nimport { KafkaClient } from \"../../KafkaClient\";\n\nexport class ProducerFactory implements IProducerFactory {\n    private topic: string;\n    private producer: Producer;\n\n    constructor(topic: string) {\n        this.topic = topic;\n        this.producer = KafkaClient.instance.producer({ createPartitioner: Partitioners.LegacyPartitioner });\n    }\n    \n    async sendMessage(key: Buffer | string, value: Buffer | string, partition?: number): Promise\u003cvoid\u003e {\n        try {\n\n            await this.producer.connect();\n\n            const record : ProducerRecord = {\n                topic: this.topic,\n                messages: [{\n                    key: key,\n                    value: value\n                }],\n            };\n\n            await this.producer.send(record);\n\n        } catch(err) {\n            throw Error(`ERROR TO SEND MESSAGE!\\n${JSON.stringify({key, value, partition, err})}`)\n        }\n    }\n}\n```\n\n## Consumer\nInterface:\n```ts\nimport { EachMessagePayload } from \"kafkajs\"\n\nexport interface IConsumerFactory {\n    listen() : Promise\u003cvoid\u003e\n}\n\nexport interface MessageProcessor {\n    run(messagePayload: EachMessagePayload) : Promise\u003cany\u003e\n}\n```\n\nImplementação:\n```ts\nimport { Consumer, EachMessagePayload } from \"kafkajs\";\nimport { IConsumerFactory, MessageProcessor } from \"./IConsumer\";\nimport { KafkaClient } from \"../../KafkaClient\";\n\nexport class ConsumerFactory implements IConsumerFactory {\n    private consumer: Consumer;\n    private messageProcessor : MessageProcessor;\n\n    constructor(groupId: string, topics: string[], messageProcessor: MessageProcessor) {\n        this.messageProcessor = messageProcessor;\n        this.consumer = KafkaClient.instance.consumer({ groupId });\n        this.consumer.subscribe({ topics, fromBeginning: true });\n    }\n    \n    async listen(): Promise\u003cvoid\u003e {\n        try {\n\n            await this.consumer.connect();\n\n            await this.consumer.run({\n                eachMessage: async (messagePayload: EachMessagePayload) =\u003e {\n                    await this.messageProcessor.run(messagePayload)\n                }\n            })\n\n        } catch(err) {\n            throw Error(`ERROR TO LISTEN!\\n${JSON.stringify({err})}`)\n        }\n    }\n}\n```\n\n## Usecase\nPara consumir as mensagens de maneira prevista dentro da sua regra de negócio voce deve criar uma classe que implementa a interface esperada pelo consumer **MessageProcessor**:\n```ts\nimport { EachMessagePayload } from \"kafkajs\";\nimport { MessageProcessor } from \"../adapters/kafka/factory/consumers/IConsumer\";\n\nexport class ProcessMessageUsecase implements MessageProcessor {\n    async run(messagePayload: EachMessagePayload): Promise\u003cany\u003e {\n        const { topic, partition, message } = messagePayload;\n        const prefix = `TOPIC: ${topic} PARTITION: ${partition} OFFSET: ${message.offset} TIMESTAMP: ${message.timestamp}`;\n        console.log(`MESSAGE RECEIVED:\\nPREFIX: [ ${prefix} ]\\nMESSAGE: [ KEY: ${message.key} VALUE: ${message.value} ]`);\n        return\n    }\n}\n```\n\n## Execução\nPara testar a aplicação estou fazendo a execução direta do meu arquivo **server.ts**:\n```ts\nimport { ConsumerFactory } from \"./adapters/kafka/factory/consumers/Consumer\";\nimport { ProducerFactory } from \"./adapters/kafka/factory/producers/Producer\";\nimport { KafkaClient } from \"./adapters/kafka/KafkaClient\";\nimport { ProcessMessageUsecase } from \"./usecases/ProcessMessage\";\n\nconst kafka = new KafkaClient();\nkafka.connect();\n\nasync function Run() {\n\n    const groupId = \"node-group-id\";\n    const topic = \"node-topic\";\n\n    const consumer = new ConsumerFactory(groupId, [topic], new ProcessMessageUsecase);\n\n    await consumer.listen()\n\n    const producer = new ProducerFactory(topic);\n\n    const msgObj = {\n        exampleInt: 10,\n        exampleBool: true,\n        exampleStr: \"String Test\"\n    };\n\n    await producer.sendMessage(\"node-key\", JSON.stringify(msgObj), 1)\n}\n\nRun()\n```\n\nVoce deve obter o resultado:\n```shell\nKAFKA CLIENT CREATED!\n{\"level\":\"INFO\",\"timestamp\":\"2024-07-27T14:09:09.198Z\",\"logger\":\"kafkajs\",\"message\":\"[Consumer] Starting\",\"groupId\":\"node-group-id\"}\n{\"level\":\"INFO\",\"timestamp\":\"2024-07-27T14:09:12.364Z\",\"logger\":\"kafkajs\",\"message\":\"[ConsumerGroup] Consumer has joined the group\",\"groupId\":\"node-group-id\",\"memberId\":\"node-client-1ac99cb7-c1bf-4583-a927-6a7cedcc1c85\",\"leaderId\":\"node-client-1ac99cb7-c1bf-4583-a927-6a7cedcc1c85\",\"isLeader\":true,\"memberAssignment\":{\"node-topic\":[0]},\"groupProtocol\":\"RoundRobinAssigner\",\"duration\":3129}\nMESSAGE RECEIVED:\nPREFIX: [ TOPIC: node-topic PARTITION: 0 OFFSET: 9 TIMESTAMP: 1722089352518 ]\nMESSAGE: [ KEY: node-key VALUE: {\"exampleInt\":10,\"exampleBool\":true,\"exampleStr\":\"String Test\"} ]\n```\n\n**OBS:** Você pode configurar o tipo de log que quer que seu driver do Kafka exiba para você, na configuração do client.\n```ts\n const config : KafkaConfig = {\n    brokers: [\"localhost:9092\"],\n    clientId: \"node-client\",\n    // para que não exiba nenhuma informação\n    logLevel: logLevel.NOTHING\n};\n```\n\nFinalmente, você tem uma aplicação Node integrada ao Kafka!","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fwesleysbmartins%2Fnode_kafka","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fwesleysbmartins%2Fnode_kafka","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fwesleysbmartins%2Fnode_kafka/lists"}