node.js - nodejs zmq - 收到的缓冲区数据比实际消息

Question

我正在做来自 this link 的 pubsub 示例并设法让它发挥作用。

服务器.js:

const zmq = require("zeromq")

async function run() {
  const sock = new zmq.Publisher

  await sock.bind("tcp://127.0.0.1:3000")
  console.log("Publisher bound to port 3000")

  while (true) {
    console.log("sending a multipart message envelope")
    await sock.send(["kitty cats", "meow!"])
    await new Promise(resolve => setTimeout(resolve, 500))
  }
}

run()

客户端.js:

const zmq = require("zeromq")

async function run() {
  const sock = new zmq.Subscriber

  sock.connect("tcp://127.0.0.1:3000")
  sock.subscribe("kitty cats")
  console.log("Subscriber connected to port 3000")

  for await (const [topic, msg] of sock) {
    console.log("received a message related to:", topic, "containing message:", msg)
  }
}

run()

所以我希望来自 client.js 的日志是:

received a message related to: kitty cats containing message: meow!

但改用这个:

received a message related to: <Buffer 6b 69 74 74 79 20 63 61 74 73> containing message: <Buffer 6d 65 6f 77 21>

这正常吗？或者有没有办法以 string 形式取回我的消息？

Answer 1

您需要使用 toString() 将 Buffer 转换为字符串(默认为 utf-8 编码)

或者您可以使用 string-decoder来自 Node

使用 stringDecoder.write(buffer)

即stringDecoder.write(主题)

const zmq = require("zeromq")

async function run() {
  const sock = new zmq.Subscriber

  sock.connect("tcp://127.0.0.1:3000")
  sock.subscribe("kitty cats")
  console.log("Subscriber connected to port 3000")

  for await (const [topic, msg] of sock) {
    console.log("received a message related to:", topic.toString("utf=8"), "containing message:", msg.toString("utf-8")
  }
}

run()