add maintenance and monitoring routes.

* `/world` to retrieve the current world state
* `/stats` for some basic statistics (# of users and pixls)
* `/reset` to reset the world state (not sure if forcing every client to
  clean the canvas is "right", maybe should not broadcast this?)

js/pixl/server.js

@@ -5,6 +5,29 @@ var express = require('express');
var app = express();
app.use(express.static(__dirname + "/public"));
app.get('/stats', function(req, res) {
	var stats = {
		users: wss.clients.length,
		pixls: Object.keys(world).length
	};
	res.setHeader('Content-Type', 'text/plain');
	res.send(JSON.stringify(stats, null, "  "));
});
app.get('/world', function(req, res) {
	res.setHeader('Content-Type', 'text/plain');
	res.send(JSON.stringify(world));
});
app.get('/reset', function(req, res) {
	world = {};
	wss.clients.forEach(function(client) {
		client.send("{}");
	});
	res.setHeader('Content-Type', 'text/plain');
	res.send(JSON.stringify({status: "ok"}));
});
var server = http.createServer(app);
server.listen(8001);
@@ -28,4 +51,4 @@ wss.on('connection', function(socket) {
			}
		});
	});
});
});