webstream - Stream api for node.js websockets

Simply provides a node.js ReadableStream and WritableStream API for websockets.

npm install webstream

Examples

Piping node.js REPL through websockets

// webrepl.js
var webstream = require('webstream');
var repl = require('repl');

webstream.createServer(function(stream) {
  repl.start('> ', stream);
}).listen(5000);

Start the server:

$ node samples/webrepl.js

This will start the node.js REPL and bind it into a websocket. To connect to this server, use the wsclient utility:

$ wsclient http://localhost:5000
> var x = { damn: "i am in the node.js repl" }
undefined
> x
{ damn: 'i am in the node.js repl' }

Piping /bin/bash through websockets

Here's how to bind a webstream to a spawned process:

// webash.js
var spawn = require('child_process').spawn;
var http = require('http');
var webstream = require('webstream');

var server = http.createServer();
server.listen(5000);

webstream.bind(server, function(stream) {
  console.log('Client connected.');

  var proc = spawn('/bin/bash', [ '-i' ]);

  // stdout & stderr
  proc.stdout.on('data', function(data) { stream.write(data); });
  proc.stderr.on('data', function(data) { stream.write(data); });
  
  proc.on('exit', function(status) {
    stream.write('Process exited with status ' + status + '\n');
    stream.end();
  });

  stream.on('data', function(data) {
    proc.stdin.write(data);
  });

  stream.on('close', function() {
    console.log('Client disconnected.');
  });
});

Start the server:

$ node samples/webash.js

Connect via wsclient:

$ bin/wsclient http://localhost:5000
bash: no job control in this shell
bash-3.2$ ls -l
ls -l
total 32
-rw-r--r--  1 eladb  staff  1058 Dec 21 19:07 LICENSE
-rw-r--r--  1 eladb  staff  1764 Dec 21 19:31 README.md
drwxr-xr-x  3 eladb  staff   102 Dec 21 18:33 bin
drwxr-xr-x  4 eladb  staff   136 Dec 21 17:25 lib
-rw-r--r--  1 eladb  staff    45 Dec 21 18:00 main.js
drwxr-xr-x  6 eladb  staff   204 Dec 21 19:12 node_modules
-rw-r--r--  1 eladb  staff   507 Dec 21 19:28 package.json
drwxr-xr-x  4 eladb  staff   136 Dec 21 17:24 samples
drwxr-xr-x  3 eladb  staff   102 Dec 21 19:08 test
bash-3.2$ exit
exit
logout
Process exited with status 0

API

webstream.createStream(connection)

Creates a WebStream object bounds to a WebSocketConnection. The object adheres to the ReadableStream and WritableStream interfaces.

webstream.bind(server, [callback])

Binds a webstream into an HTTP server.

• Callback is an optional function(stream) which is called for every new connection.
• Returns an EventEmitter with a 'request' event which is called for every incoming connection. Callbacks are passed a single WebStream argument.

webstream.createServer(callback)

Creates an HTTP server and binds a webstream to it. Returns the HTTP server object.

webstream.connect(url, [callback])

Connects to a webstream server.

• Callback function(err, stream) is optional.
• Returns an EventEmitter with the following API:
  • 'connect' event - Called when a connection has been established successfuly. Callbacks are passed a single argument which is a WebStream object.
  • 'error' event - Called if the connection failed. Argument is error.

License

MIT