dgram-as-promised

This module provides promisified version of standard dgram class. The API is the same as for standard dgram, except bind, close and send methods which return Promise object.

Requirements

This module requires ES6 with Node >= 10.

Installation

npm install dgram-as-promised

Additionally for Typescript:

npm install -D @types/node

Usage

dgram-as-promised can be used similar to standard dgram module.

Example:

const {DgramAsPromised} = require("dgram-as-promised")

const socket = DgramAsPromised.createSocket("udp4")

const MEMBERSHIP = "224.0.0.1"
const PORT = 41234

const message = Buffer.from("ABCDEFGH")

Typescript:

import DgramAsPromised from "dgram-as-promised"
// or
import {DgramAsPromised} from "dgram-as-promised"

const socket = DgramAsPromised.createSocket("udp4")

bind

Method bind returns Promise object which resolves to address info when listening event is emitted.

const address = await socket.bind()
console.log(`Socket is listening on ${address.address}:${address.port}`)

socket.setBroadcast(true)
socket.setMulticastTTL(128)

socket.addMembership(MEMBERSHIP)
console.log("Membership is set")

send

Method send returns Promise object which is fulfilled when message has been sent.

const bytes = await socket.send(message, 0, message.length, PORT, MEMBERSHIP)
console.log(`Message is sent (${bytes} bytes)`)

recv

Method recv returns Promise object which resolves to the object with msg and rinfo properties as from message event or resolves to undefined when socket is already closed.

const packet = await socket.recv()
if (packet) {
  console.log(`Received message: ${packet.msg.toString()}`)
  console.log(`Received ${packet.rinfo.size} bytes`)
}

close

Method close returns Promise object which resolves when close event is emitted.

await socket.close()
console.log("Socket is closed")

iterate

Method iterate and the socket object return asynchronous iterator which will call recv method until socket is closed.

for await (const packet of socket) {
  console.info(packet.msg.toString())
  // Close socket if Ctrl-D is in the message
  if (packet.msg.indexOf(4) !== -1) {
    await socket.close()
  }
}

destroy

Method destroy cleans internal listeners.

socket.destroy()

License

Copyright (c) 2016-2020 Piotr Roszatycki mailto:[email protected]

MIT