memorystream

Introduction

node-memorystream - this module allow create streams in memory. It can be used for emulating file streams, filtering/mutating data between one stream and another, buffering incoming data, being the gap between two data/network streams of variable rates, etc. MemoryStream support read/write states or only read state or only write state. The API is meant to follow node's Stream implementation. Module supports streams for node > 0.10 now.

Original module is here git://github.com/ollym/memstream.git was remade and improved.

Installation

If you have npm installed, you can simply type:

npm install memorystream

Or you can clone this repository using the git command:

git clone git://github.com/JSBizon/node-memorystream.git

Usage

Some examples how to use memorystream module.

Basic I/O Operation

In this example I illustrate the basic I/O operations of the memory stream.

var MemoryStream = require('memorystream');
var memStream = new MemoryStream(['Hello',' ']);

var data = '';
memStream.on('data', function(chunk) {
	data += chunk.toString();
});

memStream.write('World');

memStream.on('end', function() {
	// outputs 'Hello World!'
	console.log(data);
});
memStream.end('!');

Piping

In this example I'm piping all data from the memory stream to the process's stdout stream.

var MemoryStream = require('memorystream');
var memStream = new MemoryStream();
memStream.pipe(process.stdout, { end: false });

memStream.write('Hello World!');

In this example I'm piping all data from the response stream to the memory stream.

var http = require('http'),
	MemoryStream = require('memorystream');

var options = {
	host: 'google.com'
};
var memStream = new MemoryStream(null, {
	readable : false
});

var req = http.get(options, function(res) {
	res.pipe(memStream);
	res.on('end', function() {
		console.log(memStream.toString());
	});
});

Delayed Response

In the example below, we first pause the stream before writing the data to it. The stream is then resumed after 1 second, and the data is written to the console.

var MemoryStream = require('memorystream');

var memStream = new MemoryStream('Hello');
var data = '';
memStream.on('data', function(chunk) {
	data += chunk;
});

memStream.pause();
memStream.write('World!');

setTimeout(function() {
	memStream.resume();
}, 1000);

Documentation

The memory stream adopts all the same methods and events as node's Stream implementation. Documentation is available here.