tools/node_tcp_promise.js


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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
// Note: this is a keep-alive server.
const { Server } = require("net");
const port = process.argv[2] || "4544";
console.log("port", port);

const response = Buffer.from(
  "HTTP/1.1 200 OK\r\nContent-Length: 12\r\n\r\nHello World\n"
);

async function write(socket, buffer) {
  let p = new Promise((resolve, reject) => {
    socket.write(buffer, resolve);
  });
  return p;
}

Server(async socket => {
  socket.on("error", _ => {
    socket.destroy();
  });
  for await (const data of socket) {
    write(socket, response);
  }
}).listen(port);