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February 24, 2022 05:57
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NodeJS Microservices with NestJS, Kafka, and Kubernetes - Part 1
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curl --location --request POST 'http://localhost:3000/services' \ | |
--header 'Content-Type: application/json' \ | |
--data-raw '{ | |
"name": "Web Development", | |
"description": "description for Web Development" | |
}' |
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npm i -g @nestjs/cli | |
mkdir microservices-nestjs-k8 | |
cd microservices-nestjs-k8 | |
git init | |
# make sure to create the repository on github under your account and add the remote origin | |
git remote add origin https://github.com/thiagotigaz/microservices-nestjs-k8.git | |
nest new -g api | |
cd api | |
npm i @nestjs/microservices kafkajs class-validator @nestjs/mapped-types | |
npm run start |
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import { IsNotEmpty, IsString, MaxLength } from 'class-validator'; | |
export class CreateServiceDto { | |
@MaxLength(64) | |
@IsString() | |
@IsNotEmpty() | |
name: string; | |
@MaxLength(255) | |
@IsString() | |
@IsNotEmpty() | |
description: string; | |
tags: string[]; | |
} |
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import { Module } from '@nestjs/common'; | |
import { ServicesService } from './services.service'; | |
import { ServicesController } from './services.controller'; | |
import { ClientKafka, ClientsModule, Transport } from '@nestjs/microservices'; | |
@Module({ | |
imports: [ | |
ClientsModule.register([ | |
{ | |
name: 'CLIENT_KAFKA', | |
transport: Transport.KAFKA, | |
options: { | |
client: { | |
clientId: 'services', | |
brokers: ['host.docker.internal:9094'], | |
}, | |
consumer: { | |
groupId: 'services', | |
}, | |
}, | |
}, | |
]), | |
], | |
controllers: [ServicesController], | |
providers: [ | |
ServicesService, | |
{ | |
provide: 'KAFKA_PRODUCER', | |
useFactory: async (kafkaClient: ClientKafka) => { | |
return kafkaClient.connect(); | |
}, | |
inject: ['CLIENT_KAFKA'], | |
}, | |
], | |
}) | |
export class ServicesModule {} |
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import { Inject, Injectable } from '@nestjs/common'; | |
import { CreateServiceDto } from './dto/create-service.dto'; | |
import { UpdateServiceDto } from './dto/update-service.dto'; | |
import { Producer } from '@nestjs/microservices/external/kafka.interface'; | |
@Injectable() | |
export class ServicesService { | |
constructor(@Inject('KAFKA_PRODUCER') private kafkaProducer: Producer) {} | |
create(createServiceDto: CreateServiceDto) { | |
const id = Math.floor(Math.random() * 100); | |
this.sendKafkaEvent(`${id}`, { | |
eventType: 'ServiceCreated', | |
id, | |
...createServiceDto, | |
}); | |
return 'This action adds a new service'; | |
} | |
findAll() { | |
return `This action returns all services`; | |
} | |
findOne(id: number) { | |
return `This action returns a #${id} service`; | |
} | |
update(id: number, updateServiceDto: UpdateServiceDto) { | |
updateServiceDto.id = id; | |
this.sendKafkaEvent(`${id}`, { | |
eventType: 'ServiceUpdated', | |
...updateServiceDto, | |
}); | |
return `This action updates a #${id} service`; | |
} | |
remove(id: number) { | |
this.sendKafkaEvent(`${id}`, { eventType: 'ServiceDeleted', id }); | |
return `This action removes a #${id} service`; | |
} | |
sendKafkaEvent(key, value) { | |
this.kafkaProducer.send({ | |
topic: 'services', | |
messages: [{ key, value: JSON.stringify(value) }], | |
}); | |
} | |
} |
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import { PartialType } from '@nestjs/mapped-types'; | |
import { CreateServiceDto } from './create-service.dto'; | |
import { IsNotEmpty } from 'class-validator'; | |
export class UpdateServiceDto extends PartialType(CreateServiceDto) { | |
@IsNotEmpty() | |
id: number; | |
} |
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