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kafka-queue.service.ts
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kafka-queue.service.ts
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/**
* @author Enéas Almeida <eneas.eng@yahoo.com>
* @description A classe é responsável por criar um serviços de filas utilizando o Kafka.
*/
import { Consumer, Kafka, Producer } from 'kafkajs';
import { QueueHandler, QueueServiceInterface } from './contracts';
export class KafkaQueueService implements QueueServiceInterface {
private kafka: Kafka;
private producer: Producer;
private consumer: Consumer;
private handlers: QueueHandler[];
constructor() {
this.init();
}
init() {
this.kafka = new Kafka({
logLevel: 1,
clientId: 'customer-clean-architecture',
brokers: ['127.0.0.1:19092', '127.0.0.1:29092', '127.0.0.1:39092'],
retry: {
initialRetryTime: 300,
retries: 3,
},
});
this.handlers = [];
}
async setHandlers(handlers?: QueueHandler[]) {
if (!handlers) return this;
this.handlers.push(...handlers);
}
async setProducer() {
this.producer = this.kafka.producer();
await this.producer
.connect()
.then(() => console.log('Producer connected'))
.catch((e) => {
throw e;
});
}
async setConsumer(topic: string, fromBeginning: boolean, groupId: string) {
this.consumer = this.kafka.consumer({
groupId,
});
await this.consumer
.connect()
.then(() => console.log('Consumer connected'))
.catch((e) => {
throw e;
});
await this.consumer
.subscribe({ topic, fromBeginning })
.then(() => {
console.log(`Consumer subscribed to ${topic}`);
})
.catch((e) => {
throw e;
});
await this.consumer
.run({
eachMessage: async ({ topic, message }) => {
if (!topic || !message || !message.value || !message.headers) return;
const { keyHandler } = message.headers;
if (!keyHandler) return;
const handler = this.handlers.find((item) => item.key === keyHandler.toString());
if (!handler) return;
try {
const messageValue = JSON.parse(message.value.toString());
await handler.fn(messageValue);
console.log(`Consumer received and processed message from ${topic}`);
} catch (e) {
console.error(e.message);
}
},
})
.then(() => console.log('Consumer running'))
.catch((e) => {
throw e;
});
}
emit(topic: string, key: string, keyHandler: string, data: any): void {
if (!this.handlers.length) throw new Error('No handlers defined');
data.createdAt = new Date();
const payload: any = {
topic,
acks: -1, // default is -1
messages: [
{
value: JSON.stringify(data),
key,
headers: {
keyHandler,
},
},
],
};
this.producer.send(payload);
}
}