In other words we now have one big global state with sockets. Imagine that we have sockets set up exactly the way we would have set them for one thread. This enables a user to be logged in at the same time on their phone and computer. Our application is a simple online chat running on four threads. Normally, in a single-threaded instance, this would not be much of a worry. See, our code being run across multiple instances actually has some significant downsides. Now, however, a new problem presents itself. Cluster enables us to spread our application over multiple threads.
Of course, there is a way around it - namely a module called cluster. Generating your express projectĬool, now that that's out of the way we're gonna set up the basics.One of the disadvantages of Node is that it is single-threaded. If you don't have curl installed you can just visit the url in a separate tab in the browser. It just feels cooler, more like someone else is triggering the socket. This tutorial assumes basic knowledge of node and the command line, but I'm gonna try and be as verbose as possible so non techie types can give it a go.Īlso, I have us test the example using curl. If you haven't already done that head on over to the nodejs website and install for your system. So without further ado let's make some stuff. For sake of keeping it clean, and leaving you with a boilerplate you can fit in your own world I'm gonna stick as close to out of the box as I can. I'm not gonna talk about those today though.
Express is extremely un-opiniontated out of the box so in my default setup I add some bells and whistles such as automagic controller setup, a standard app/* dir for controllers, routes, models, and views and a few more things to tweak it to my workflow. While in the end it's a trivial fix, a quick google didn't provide much for answers so I figured I'd put together a simple guide on Express and Socket.io using the command line Express generator.Įxpress has been my go to node framework for some time, it's replaced Sinatra as my un-opinionated web framework of choice. Socket.io's documentation is pretty good, but doesn't "just work" with the Express generator setup. Recently we went about adding socket.io to a site scaffolding created with Express application generator.
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