Node.js 如何使用Nodejs在RabbitMQ中实现远程过程调用(RPC)
因此,我想获取一个Json并将其解析为对象,然后实现一个RPC RabbitMQ服务器,这样我就可以通过RabbitMQ将对象发送到服务器,在那里,该对象将继续保存在一个本地数组和一个通用唯一id中,该id将告诉对象存储的确切位置,将通过RPC从该服务器返回到客户端 官方网站展示了RabbitMQ中RPC的一些实现,在这里您可以找到它们的实现,在教程中,它们发送一个数字,服务器将计算斐波那契序列并将结果返回给客户端。相反,我想发送一个对象,而不是一个数字,我想接收该对象的通用唯一id(uuid),我将其存储在程序的全局数组中,我更改了代码,使其发送一个对象并返回uuid,但它不起作用。我非常感谢你们的帮助Node.js 如何使用Nodejs在RabbitMQ中实现远程过程调用(RPC),node.js,rabbitmq,rpc,amqp,Node.js,Rabbitmq,Rpc,Amqp,因此,我想获取一个Json并将其解析为对象,然后实现一个RPC RabbitMQ服务器,这样我就可以通过RabbitMQ将对象发送到服务器,在那里,该对象将继续保存在一个本地数组和一个通用唯一id中,该id将告诉对象存储的确切位置,将通过RPC从该服务器返回到客户端 官方网站展示了RabbitMQ中RPC的一些实现,在这里您可以找到它们的实现,在教程中,它们发送一个数字,服务器将计算斐波那契序列并将结果返回给客户端。相反,我想发送一个对象,而不是一个数字,我想接收该对象的通用唯一id(uuid)
//this is my server_rpc.js code :
const amqp = require('amqplib/callback_api');
const uuid = require("uuid/v1");
amqp.connect('here is the url: example: localhost', (err, conn) => {
conn.createChannel( (err, ch) => {
let q = 'rpc_queue';
ch.assertQueue(q, {durable: false});
ch.prefetch(10);
console.log(' [x] Waiting RPC requests');
ch.consume(q, function reply(msg) {
console.log("corralation key is: ", msg.properties.correlationId);
let n = uuid();
console.log(" data received ",JSON.parse(JSON.stringify(msg.content.toString())));
console.log("corralation key is: ", msg.properties.correlationId);
ch.sendToQueue(msg.properties.replyTo, Buffer.from(n.toString()), {correlationId: msg.properties.correlationId});
ch.ack(msg);
});
});
}))
}))
当我运行server_rpc时,应该打印等待请求的[x],然后在单独的cmd中运行client_rpc.js,然后发送对象,服务器执行并将uuid返回给客户端。这里您需要的似乎是直接回复rpc模式:您想要发送消息并获得响应 以下是有关RabbitMQ的直接回复的文档: TL;TR 下面是一个客户机和服务器的示例,它可以从机箱中工作: 里面是什么 安装RabbitMQ后,您将有2个文件要执行: server.js
const amqp = require('amqplib');
const uuidv4 = require('uuid/v4');
const RABBITMQ = 'amqp://guest:guest@localhost:5672';
const open = require('amqplib').connect(RABBITMQ);
const q = 'example';
// Consumer
open
.then(function(conn) {
console.log(`[ ${new Date()} ] Server started`);
return conn.createChannel();
})
.then(function(ch) {
return ch.assertQueue(q).then(function(ok) {
return ch.consume(q, function(msg) {
console.log(
`[ ${new Date()} ] Message received: ${JSON.stringify(
JSON.parse(msg.content.toString('utf8')),
)}`,
);
if (msg !== null) {
const response = {
uuid: uuidv4(),
};
console.log(
`[ ${new Date()} ] Message sent: ${JSON.stringify(response)}`,
);
ch.sendToQueue(
msg.properties.replyTo,
Buffer.from(JSON.stringify(response)),
{
correlationId: msg.properties.correlationId,
},
);
ch.ack(msg);
}
});
});
})
.catch(console.warn);
client.js
const amqp = require('amqplib');
const EventEmitter = require('events');
const uuid = require('uuid');
const RABBITMQ = 'amqp://guest:guest@localhost:5672';
// pseudo-queue for direct reply-to
const REPLY_QUEUE = 'amq.rabbitmq.reply-to';
const q = 'example';
// Credits for Event Emitter goes to https://github.com/squaremo/amqp.node/issues/259
const createClient = rabbitmqconn =>
amqp
.connect(rabbitmqconn)
.then(conn => conn.createChannel())
.then(channel => {
channel.responseEmitter = new EventEmitter();
channel.responseEmitter.setMaxListeners(0);
channel.consume(
REPLY_QUEUE,
msg => {
channel.responseEmitter.emit(
msg.properties.correlationId,
msg.content.toString('utf8'),
);
},
{ noAck: true },
);
return channel;
});
const sendRPCMessage = (channel, message, rpcQueue) =>
new Promise(resolve => {
const correlationId = uuid.v4();
channel.responseEmitter.once(correlationId, resolve);
channel.sendToQueue(rpcQueue, Buffer.from(message), {
correlationId,
replyTo: REPLY_QUEUE,
});
});
const init = async () => {
const channel = await createClient(RABBITMQ);
const message = { uuid: uuid.v4() };
console.log(`[ ${new Date()} ] Message sent: ${JSON.stringify(message)}`);
const respone = await sendRPCMessage(channel, JSON.stringify(message), q);
console.log(`[ ${new Date()} ] Message received: ${respone}`);
process.exit();
};
try {
init();
} catch (e) {
console.log(e);
}
你会得到一个结果,比如:
const amqp = require('amqplib');
const uuidv4 = require('uuid/v4');
const RABBITMQ = 'amqp://guest:guest@localhost:5672';
const open = require('amqplib').connect(RABBITMQ);
const q = 'example';
// Consumer
open
.then(function(conn) {
console.log(`[ ${new Date()} ] Server started`);
return conn.createChannel();
})
.then(function(ch) {
return ch.assertQueue(q).then(function(ok) {
return ch.consume(q, function(msg) {
console.log(
`[ ${new Date()} ] Message received: ${JSON.stringify(
JSON.parse(msg.content.toString('utf8')),
)}`,
);
if (msg !== null) {
const response = {
uuid: uuidv4(),
};
console.log(
`[ ${new Date()} ] Message sent: ${JSON.stringify(response)}`,
);
ch.sendToQueue(
msg.properties.replyTo,
Buffer.from(JSON.stringify(response)),
{
correlationId: msg.properties.correlationId,
},
);
ch.ack(msg);
}
});
});
})
.catch(console.warn);
const amqp = require('amqplib');
const EventEmitter = require('events');
const uuid = require('uuid');
const RABBITMQ = 'amqp://guest:guest@localhost:5672';
// pseudo-queue for direct reply-to
const REPLY_QUEUE = 'amq.rabbitmq.reply-to';
const q = 'example';
// Credits for Event Emitter goes to https://github.com/squaremo/amqp.node/issues/259
const createClient = rabbitmqconn =>
amqp
.connect(rabbitmqconn)
.then(conn => conn.createChannel())
.then(channel => {
channel.responseEmitter = new EventEmitter();
channel.responseEmitter.setMaxListeners(0);
channel.consume(
REPLY_QUEUE,
msg => {
channel.responseEmitter.emit(
msg.properties.correlationId,
msg.content.toString('utf8'),
);
},
{ noAck: true },
);
return channel;
});
const sendRPCMessage = (channel, message, rpcQueue) =>
new Promise(resolve => {
const correlationId = uuid.v4();
channel.responseEmitter.once(correlationId, resolve);
channel.sendToQueue(rpcQueue, Buffer.from(message), {
correlationId,
replyTo: REPLY_QUEUE,
});
});
const init = async () => {
const channel = await createClient(RABBITMQ);
const message = { uuid: uuid.v4() };
console.log(`[ ${new Date()} ] Message sent: ${JSON.stringify(message)}`);
const respone = await sendRPCMessage(channel, JSON.stringify(message), q);
console.log(`[ ${new Date()} ] Message received: ${respone}`);
process.exit();
};
try {
init();
} catch (e) {
console.log(e);
}