promisify-io

What is this?

This library makes input/output operations use promises as much as possible. It can be used to make tests including many input/ouptut operations easier to write and maintain. It is not optimized for performance and should not be used in production code.

How to install?

To install just run

npm install promisify-io

and then use with

var pio = require("promisify-io");

How to use?

When doing tests on sockets or other stream based input/output devices you might run into the problem that your control flow gets complex and convoluted because the APIs are event based and you have to react different for each message.

With promisify-io you can use promises to send() and recv() data. This lets you use the data wherever you need it without having to create complex structures. Here is an example

socket.send("hello").then(function() {
  return socket.recv();
}).then(function(data) {
  console.log(data);
});

The method sendRecv() even lets you send and receive data in one step.

Here is a test for an echo server using mocha, chai and chai-as-promised.

describe("Echo", function() {
  var socket = new PromiseSocketClient("localhost", 4321);
  it("should receive the same data which was sent", function() {
   return socket.connect().then(function() {
      return socket.sendRecv("hello");
    }).then(function(data) {
      data.should.deep.equal("hello");
      return socket.sendRecv("world")
    }).then(function(data) {
      data.should.deep.equal("world");
    });
  });
});