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kafka.js
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kafka.js
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import { Kafka } from "kafkajs";
const kafka = new Kafka({
clientId: "testing-kafka",
brokers: ["localhost:9092"]
})
export const kProducer = async () => {
const producer = kafka.producer()
await producer.connect()
await producer.send({
topic: 'test-topic',
messages: [
{ value: 'Hello KafkaJS user!' },
],
})
await producer.disconnect()
}
export const kConsumer = async () => {
const consumer = kafka.consumer({ groupId: 'test-group' })
await consumer.connect()
await consumer.subscribe({ topic: 'test-topic', fromBeginning: true })
await consumer.run({
eachMessage: async ({ topic, partition, message }) => {
console.log({
value: message.value.toString(), offset: message.offset
})
const producer = kafka.producer()
await producer.connect()
await producer.send({
topic: "new-topic",
messages: [
{ value: JSON.stringify('new topic is running') }
]
})
},
})
const anotherConsumer = kafka.consumer({ groupId: "test-group-3" })
await anotherConsumer.connect()
await anotherConsumer.subscribe({ topic: 'new-topic' })
await anotherConsumer.run({
eachMessage: async ({ topic, partition, message }) => {
console.log({
value: message.value.toString()
})
}
})
}