在LoopBack 4中实现RabbitMQ或Bull.js可以通过以下步骤完成:
npm install amqplib bull
src/application.ts
)中,添加RabbitMQ或Bull.js的连接配置。你需要提供主机名、端口、用户名、密码等信息。例如,对于RabbitMQ,配置可能如下所示:import {rabbitmq} from './datasources';
export class MyApplication extends BootMixin(
ServiceMixin(RepositoryMixin(RestApplication)),
) {
constructor(options: ApplicationConfig = {}) {
// ...
this.configure(rabbitmq, {
url: 'amqp://guest:guest@localhost:5672',
});
// ...
}
}
import {inject} from '@loopback/core';
import {rabbitmq} from '../datasources';
export class ProducerController {
constructor(
@inject('datasources.rabbitmq') private rabbitmqDataSource: RabbitmqDataSource,
) {}
@post('/messages')
async sendMessage(@requestBody() message: string): Promise<void> {
const channel = await this.rabbitmqDataSource.connection.createChannel();
await channel.assertQueue('my-queue');
await channel.sendToQueue('my-queue', Buffer.from(message));
await channel.close();
}
}
import {inject} from '@loopback/core';
import {rabbitmq} from '../datasources';
export class ConsumerController {
constructor(
@inject('datasources.rabbitmq') private rabbitmqDataSource: RabbitmqDataSource,
) {}
@get('/messages')
async receiveMessage(): Promise<string> {
const channel = await this.rabbitmqDataSource.connection.createChannel();
await channel.assertQueue('my-queue');
const message = await channel.get('my-queue');
await channel.close();
return message?.content.toString();
}
}
src/controllers/index.ts
)中,将生产者和消费者控制器添加到路由中。例如:import {ProducerController, ConsumerController} from './';
export class MyController extends Controller {
constructor(
@inject('controllers.ProducerController')
public producerController: ProducerController,
@inject('controllers.ConsumerController')
public consumerController: ConsumerController,
) {
super();
}
@post('/messages', {
responses: {
'200': {
description: 'Send a message',
},
},
})
async sendMessage(@requestBody() message: string): Promise<void> {
await this.producerController.sendMessage(message);
}
@get('/messages', {
responses: {
'200': {
description: 'Receive a message',
content: {
'application/json': {
schema: {
type: 'string',
},
},
},
},
},
})
async receiveMessage(): Promise<string> {
return this.consumerController.receiveMessage();
}
}
npm start
或yarn start
启动LoopBack 4应用程序。然后,你可以使用任何HTTP客户端(例如Postman)发送POST请求来发送消息,使用GET请求来接收消息。这是一个基本的示例,你可以根据自己的需求进行扩展和定制。请注意,这只是一个示例,实际应用中可能需要更多的错误处理、验证和安全性措施。
关于LoopBack 4、RabbitMQ和Bull.js的更多信息,你可以参考以下链接:
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